From 3bf127637e22ddf95e67e10a23c339cee3d52429 Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Thu, 21 Jan 2010 00:02:36 -0800 Subject: Input: sh_keysc - add mode 4 and mode 5 support Add Mode 4 and Mode 5 support to the SH_KEYSC driver. These modes allow slightly larger key pad matrixes. While at it, make use of resource_size(). Signed-off-by: Magnus Damm Signed-off-by: Dmitry Torokhov --- include/linux/input/sh_keysc.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'include/linux/input') diff --git a/include/linux/input/sh_keysc.h b/include/linux/input/sh_keysc.h index c211b5cf08e6..2aff38bcf2ba 100644 --- a/include/linux/input/sh_keysc.h +++ b/include/linux/input/sh_keysc.h @@ -1,10 +1,11 @@ #ifndef __SH_KEYSC_H__ #define __SH_KEYSC_H__ -#define SH_KEYSC_MAXKEYS 30 +#define SH_KEYSC_MAXKEYS 42 struct sh_keysc_info { - enum { SH_KEYSC_MODE_1, SH_KEYSC_MODE_2, SH_KEYSC_MODE_3 } mode; + enum { SH_KEYSC_MODE_1, SH_KEYSC_MODE_2, SH_KEYSC_MODE_3, + SH_KEYSC_MODE_4, SH_KEYSC_MODE_5 } mode; int scan_timing; /* 0 -> 7, see KYCR1, SCN[2:0] */ int delay; int kycr2_delay; -- cgit v1.2.3 From 8f8be2439cd368cc6ba94888919ee90b5a26f0cb Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Wed, 10 Feb 2010 23:03:22 -0800 Subject: Input: sh_keysc - update the driver with mode 6 Add mode 6 support to the sh_keysc driver. Also update the KYOUTDR mask value to include all 16 register bits. Signed-off-by: Magnus Damm Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/sh_keysc.c | 3 ++- include/linux/input/sh_keysc.h | 6 +++--- 2 files changed, 5 insertions(+), 4 deletions(-) (limited to 'include/linux/input') diff --git a/drivers/input/keyboard/sh_keysc.c b/drivers/input/keyboard/sh_keysc.c index c2fc97732f0c..854e2035cd6e 100644 --- a/drivers/input/keyboard/sh_keysc.c +++ b/drivers/input/keyboard/sh_keysc.c @@ -31,6 +31,7 @@ static const struct { [SH_KEYSC_MODE_3] = { 2, 4, 7 }, [SH_KEYSC_MODE_4] = { 3, 6, 6 }, [SH_KEYSC_MODE_5] = { 4, 6, 7 }, + [SH_KEYSC_MODE_6] = { 5, 7, 7 }, }; struct sh_keysc_priv { @@ -109,7 +110,7 @@ static irqreturn_t sh_keysc_isr(int irq, void *dev_id) n = keyin_nr * i; /* drive one KEYOUT pin low, read KEYIN pins */ - sh_keysc_write(priv, KYOUTDR, 0xfff ^ (3 << (i * 2))); + sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2))); udelay(pdata->delay); tmp = sh_keysc_read(priv, KYINDR); diff --git a/include/linux/input/sh_keysc.h b/include/linux/input/sh_keysc.h index 2aff38bcf2ba..649dc7f12925 100644 --- a/include/linux/input/sh_keysc.h +++ b/include/linux/input/sh_keysc.h @@ -1,15 +1,15 @@ #ifndef __SH_KEYSC_H__ #define __SH_KEYSC_H__ -#define SH_KEYSC_MAXKEYS 42 +#define SH_KEYSC_MAXKEYS 49 struct sh_keysc_info { enum { SH_KEYSC_MODE_1, SH_KEYSC_MODE_2, SH_KEYSC_MODE_3, - SH_KEYSC_MODE_4, SH_KEYSC_MODE_5 } mode; + SH_KEYSC_MODE_4, SH_KEYSC_MODE_5, SH_KEYSC_MODE_6 } mode; int scan_timing; /* 0 -> 7, see KYCR1, SCN[2:0] */ int delay; int kycr2_delay; - int keycodes[SH_KEYSC_MAXKEYS]; + int keycodes[SH_KEYSC_MAXKEYS]; /* KEYIN * KEYOUT */ }; #endif /* __SH_KEYSC_H__ */ -- cgit v1.2.3 From 9d32c30542f9ecdb4b96a1a960924c9f403e3562 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 5 Apr 2010 22:29:09 -0700 Subject: Input: matrix_keypad - allow platform to disable key autorepeat In an embedded system the matrix_keypad driver might be used to interface with an external control panel and not an actual keyboard. On the control panel some of the keys could be used to turn on/off various functions. If key autorepeat is enabled this causes the function to quickly toggle between the on and off states and makes operation difficult. Add an option in the platform-specific data to disable the key autorepeat. Signed-off-by: H Hartley Sweeten Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/matrix_keypad.c | 4 +++- include/linux/input/matrix_keypad.h | 2 ++ 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'include/linux/input') diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c index d3c8b61a941d..f9d86cfb0db0 100644 --- a/drivers/input/keyboard/matrix_keypad.c +++ b/drivers/input/keyboard/matrix_keypad.c @@ -373,7 +373,9 @@ static int __devinit matrix_keypad_probe(struct platform_device *pdev) input_dev->name = pdev->name; input_dev->id.bustype = BUS_HOST; input_dev->dev.parent = &pdev->dev; - input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); + input_dev->evbit[0] = BIT_MASK(EV_KEY); + if (!pdata->no_autorepeat) + input_dev->evbit[0] |= BIT_MASK(EV_REP); input_dev->open = matrix_keypad_start; input_dev->close = matrix_keypad_stop; diff --git a/include/linux/input/matrix_keypad.h b/include/linux/input/matrix_keypad.h index 3bd018baae20..c964cd7f436a 100644 --- a/include/linux/input/matrix_keypad.h +++ b/include/linux/input/matrix_keypad.h @@ -44,6 +44,7 @@ struct matrix_keymap_data { * @active_low: gpio polarity * @wakeup: controls whether the device should be set up as wakeup * source + * @no_autorepeat: disable key autorepeat * * This structure represents platform-specific data that use used by * matrix_keypad driver to perform proper initialization. @@ -64,6 +65,7 @@ struct matrix_keypad_platform_data { bool active_low; bool wakeup; + bool no_autorepeat; }; /** -- cgit v1.2.3 From 31a6296333b94964e9a073649840bb34d4603369 Mon Sep 17 00:00:00 2001 From: Bryan Wu Date: Sun, 21 Mar 2010 23:23:24 -0700 Subject: Input: add Analog Devices AD714x captouch input driver AD7142 and AD7147 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7147 can interface to external capacitance sensors implementing functions such as buttons, scrollwheels, sliders, touchpads and so on. The chips don't restrict the specific usage. Depending on the hardware connection, one special target board can include one or several these components. The platform_data for the device's "struct device" holds these information. The data-struct defined in head file descript the hardware feature of button/scrollwheel/slider/touchpad components on target boards, which need be filled in the arch/mach-/. As the result, the driver is independent of boards. It gets the components layout from the platform_data, registers related devices, fullfills the algorithms and state machines for these components and report related input events to up level. Signed-off-by: Bryan Wu Signed-off-by: Michael Hennerich Signed-off-by: Barry Song <21cnbao@gmail.com> Signed-off-by: Mike Frysinger Signed-off-by: Dmitry Torokhov --- drivers/input/misc/Kconfig | 30 + drivers/input/misc/Makefile | 3 + drivers/input/misc/ad714x-i2c.c | 137 ++++ drivers/input/misc/ad714x-spi.c | 103 +++ drivers/input/misc/ad714x.c | 1331 +++++++++++++++++++++++++++++++++++++++ drivers/input/misc/ad714x.h | 26 + include/linux/input.h | 1 + include/linux/input/ad714x.h | 63 ++ 8 files changed, 1694 insertions(+) create mode 100644 drivers/input/misc/ad714x-i2c.c create mode 100644 drivers/input/misc/ad714x-spi.c create mode 100644 drivers/input/misc/ad714x.c create mode 100644 drivers/input/misc/ad714x.h create mode 100644 include/linux/input/ad714x.h (limited to 'include/linux/input') diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 54a9c2d0ba1c..a4b9dc5cf456 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -22,6 +22,36 @@ config INPUT_88PM860X_ONKEY To compile this driver as a module, choose M here: the module will be called 88pm860x_onkey. +config INPUT_AD714X + tristate "Analog Devices AD714x Capacitance Touch Sensor" + help + Say Y here if you want to support an AD7142/AD7147 touch sensor. + + You should select a bus connection too. + + To compile this driver as a module, choose M here: the + module will be called ad714x. + +config INPUT_AD714X_I2C + tristate "support I2C bus connection" + depends on INPUT_AD714X && I2C + default y + help + Say Y here if you have AD7142/AD7147 hooked to an I2C bus. + + To compile this driver as a module, choose M here: the + module will be called ad714x-i2c. + +config INPUT_AD714X_SPI + tristate "support SPI bus connection" + depends on INPUT_AD714X && SPI + default y + help + Say Y here if you have AD7142/AD7147 hooked to a SPI bus. + + To compile this driver as a module, choose M here: the + module will be called ad714x-spi. + config INPUT_PCSPKR tristate "PC Speaker support" depends on PCSPKR_PLATFORM diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index a662df21bf57..f9f577031e06 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -5,6 +5,9 @@ # Each configuration option enables a list of files. obj-$(CONFIG_INPUT_88PM860X_ONKEY) += 88pm860x_onkey.o +obj-$(CONFIG_INPUT_AD714X) += ad714x.o +obj-$(CONFIG_INPUT_AD714X_I2C) += ad714x-i2c.o +obj-$(CONFIG_INPUT_AD714X_SPI) += ad714x-spi.o obj-$(CONFIG_INPUT_APANEL) += apanel.o obj-$(CONFIG_INPUT_ATI_REMOTE) += ati_remote.o obj-$(CONFIG_INPUT_ATI_REMOTE2) += ati_remote2.o diff --git a/drivers/input/misc/ad714x-i2c.c b/drivers/input/misc/ad714x-i2c.c new file mode 100644 index 000000000000..a2cb6b426dc7 --- /dev/null +++ b/drivers/input/misc/ad714x-i2c.c @@ -0,0 +1,137 @@ +/* + * AD714X CapTouch Programmable Controller driver (I2C bus) + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include /* BUS_I2C */ +#include +#include +#include +#include "ad714x.h" + +#ifdef CONFIG_PM +static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message) +{ + return ad714x_disable(i2c_get_clientdata(client)); +} + +static int ad714x_i2c_resume(struct i2c_client *client) +{ + return ad714x_enable(i2c_get_clientdata(client)); +} +#else +# define ad714x_i2c_suspend NULL +# define ad714x_i2c_resume NULL +#endif + +static int ad714x_i2c_write(struct device *dev, unsigned short reg, + unsigned short data) +{ + struct i2c_client *client = to_i2c_client(dev); + int ret = 0; + u8 *_reg = (u8 *)® + u8 *_data = (u8 *)&data; + + u8 tx[4] = { + _reg[1], + _reg[0], + _data[1], + _data[0] + }; + + ret = i2c_master_send(client, tx, 4); + if (ret < 0) + dev_err(&client->dev, "I2C write error\n"); + + return ret; +} + +static int ad714x_i2c_read(struct device *dev, unsigned short reg, + unsigned short *data) +{ + struct i2c_client *client = to_i2c_client(dev); + int ret = 0; + u8 *_reg = (u8 *)® + u8 *_data = (u8 *)data; + + u8 tx[2] = { + _reg[1], + _reg[0] + }; + u8 rx[2]; + + ret = i2c_master_send(client, tx, 2); + if (ret >= 0) + ret = i2c_master_recv(client, rx, 2); + + if (unlikely(ret < 0)) { + dev_err(&client->dev, "I2C read error\n"); + } else { + _data[0] = rx[1]; + _data[1] = rx[0]; + } + + return ret; +} + +static int __devinit ad714x_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad714x_chip *chip; + + chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, + ad714x_i2c_read, ad714x_i2c_write); + if (IS_ERR(chip)) + return PTR_ERR(chip); + + i2c_set_clientdata(client, chip); + + return 0; +} + +static int __devexit ad714x_i2c_remove(struct i2c_client *client) +{ + struct ad714x_chip *chip = i2c_get_clientdata(client); + + ad714x_remove(chip); + i2c_set_clientdata(client, NULL); + + return 0; +} + +static const struct i2c_device_id ad714x_id[] = { + { "ad7142_captouch", 0 }, + { "ad7147_captouch", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ad714x_id); + +static struct i2c_driver ad714x_i2c_driver = { + .driver = { + .name = "ad714x_captouch", + }, + .probe = ad714x_i2c_probe, + .remove = __devexit_p(ad714x_i2c_remove), + .suspend = ad714x_i2c_suspend, + .resume = ad714x_i2c_resume, + .id_table = ad714x_id, +}; + +static __init int ad714x_i2c_init(void) +{ + return i2c_add_driver(&ad714x_i2c_driver); +} +module_init(ad714x_i2c_init); + +static __exit void ad714x_i2c_exit(void) +{ + i2c_del_driver(&ad714x_i2c_driver); +} +module_exit(ad714x_i2c_exit); + +MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/input/misc/ad714x-spi.c b/drivers/input/misc/ad714x-spi.c new file mode 100644 index 000000000000..7f8dedfd1bfe --- /dev/null +++ b/drivers/input/misc/ad714x-spi.c @@ -0,0 +1,103 @@ +/* + * AD714X CapTouch Programmable Controller driver (SPI bus) + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include /* BUS_I2C */ +#include +#include +#include +#include "ad714x.h" + +#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */ +#define AD714x_SPI_READ BIT(10) + +#ifdef CONFIG_PM +static int ad714x_spi_suspend(struct spi_device *spi, pm_message_t message) +{ + return ad714x_disable(spi_get_drvdata(spi)); +} + +static int ad714x_spi_resume(struct spi_device *spi) +{ + return ad714x_enable(spi_get_drvdata(spi)); +} +#else +# define ad714x_spi_suspend NULL +# define ad714x_spi_resume NULL +#endif + +static int ad714x_spi_read(struct device *dev, unsigned short reg, + unsigned short *data) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned short tx = AD714x_SPI_CMD_PREFIX | AD714x_SPI_READ | reg; + + return spi_write_then_read(spi, (u8 *)&tx, 2, (u8 *)data, 2); +} + +static int ad714x_spi_write(struct device *dev, unsigned short reg, + unsigned short data) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned short tx[2] = { + AD714x_SPI_CMD_PREFIX | reg, + data + }; + + return spi_write(spi, (u8 *)tx, 4); +} + +static int __devinit ad714x_spi_probe(struct spi_device *spi) +{ + struct ad714x_chip *chip; + + chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq, + ad714x_spi_read, ad714x_spi_write); + if (IS_ERR(chip)) + return PTR_ERR(chip); + + spi_set_drvdata(spi, chip); + + return 0; +} + +static int __devexit ad714x_spi_remove(struct spi_device *spi) +{ + struct ad714x_chip *chip = spi_get_drvdata(spi); + + ad714x_remove(chip); + spi_set_drvdata(spi, NULL); + + return 0; +} + +static struct spi_driver ad714x_spi_driver = { + .driver = { + .name = "ad714x_captouch", + .owner = THIS_MODULE, + }, + .probe = ad714x_spi_probe, + .remove = __devexit_p(ad714x_spi_remove), + .suspend = ad714x_spi_suspend, + .resume = ad714x_spi_resume, +}; + +static __init int ad714x_spi_init(void) +{ + return spi_register_driver(&ad714x_spi_driver); +} +module_init(ad714x_spi_init); + +static __exit void ad714x_spi_exit(void) +{ + spi_unregister_driver(&ad714x_spi_driver); +} +module_exit(ad714x_spi_exit); + +MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver"); +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/input/misc/ad714x.c b/drivers/input/misc/ad714x.c new file mode 100644 index 000000000000..691b1d37331f --- /dev/null +++ b/drivers/input/misc/ad714x.c @@ -0,0 +1,1331 @@ +/* + * AD714X CapTouch Programmable Controller driver + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include +#include +#include +#include +#include +#include +#include "ad714x.h" + +#define AD714X_PWR_CTRL 0x0 +#define AD714X_STG_CAL_EN_REG 0x1 +#define AD714X_AMB_COMP_CTRL0_REG 0x2 +#define AD714X_PARTID_REG 0x17 +#define AD7147_PARTID 0x1470 +#define AD7142_PARTID 0xE620 +#define AD714X_STAGECFG_REG 0x80 +#define AD714X_SYSCFG_REG 0x0 + +#define STG_LOW_INT_EN_REG 0x5 +#define STG_HIGH_INT_EN_REG 0x6 +#define STG_COM_INT_EN_REG 0x7 +#define STG_LOW_INT_STA_REG 0x8 +#define STG_HIGH_INT_STA_REG 0x9 +#define STG_COM_INT_STA_REG 0xA + +#define CDC_RESULT_S0 0xB +#define CDC_RESULT_S1 0xC +#define CDC_RESULT_S2 0xD +#define CDC_RESULT_S3 0xE +#define CDC_RESULT_S4 0xF +#define CDC_RESULT_S5 0x10 +#define CDC_RESULT_S6 0x11 +#define CDC_RESULT_S7 0x12 +#define CDC_RESULT_S8 0x13 +#define CDC_RESULT_S9 0x14 +#define CDC_RESULT_S10 0x15 +#define CDC_RESULT_S11 0x16 + +#define STAGE0_AMBIENT 0xF1 +#define STAGE1_AMBIENT 0x115 +#define STAGE2_AMBIENT 0x139 +#define STAGE3_AMBIENT 0x15D +#define STAGE4_AMBIENT 0x181 +#define STAGE5_AMBIENT 0x1A5 +#define STAGE6_AMBIENT 0x1C9 +#define STAGE7_AMBIENT 0x1ED +#define STAGE8_AMBIENT 0x211 +#define STAGE9_AMBIENT 0x234 +#define STAGE10_AMBIENT 0x259 +#define STAGE11_AMBIENT 0x27D + +#define PER_STAGE_REG_NUM 36 +#define STAGE_NUM 12 +#define STAGE_CFGREG_NUM 8 +#define SYS_CFGREG_NUM 8 + +/* + * driver information which will be used to maintain the software flow + */ +enum ad714x_device_state { IDLE, JITTER, ACTIVE, SPACE }; + +struct ad714x_slider_drv { + int highest_stage; + int abs_pos; + int flt_pos; + enum ad714x_device_state state; + struct input_dev *input; +}; + +struct ad714x_wheel_drv { + int abs_pos; + int flt_pos; + int pre_mean_value; + int pre_highest_stage; + int pre_mean_value_no_offset; + int mean_value; + int mean_value_no_offset; + int pos_offset; + int pos_ratio; + int highest_stage; + enum ad714x_device_state state; + struct input_dev *input; +}; + +struct ad714x_touchpad_drv { + int x_highest_stage; + int x_flt_pos; + int x_abs_pos; + int y_highest_stage; + int y_flt_pos; + int y_abs_pos; + int left_ep; + int left_ep_val; + int right_ep; + int right_ep_val; + int top_ep; + int top_ep_val; + int bottom_ep; + int bottom_ep_val; + enum ad714x_device_state state; + struct input_dev *input; +}; + +struct ad714x_button_drv { + enum ad714x_device_state state; + /* + * Unlike slider/wheel/touchpad, all buttons point to + * same input_dev instance + */ + struct input_dev *input; +}; + +struct ad714x_driver_data { + struct ad714x_slider_drv *slider; + struct ad714x_wheel_drv *wheel; + struct ad714x_touchpad_drv *touchpad; + struct ad714x_button_drv *button; +}; + +/* + * information to integrate all things which will be private data + * of spi/i2c device + */ +struct ad714x_chip { + unsigned short h_state; + unsigned short l_state; + unsigned short c_state; + unsigned short adc_reg[STAGE_NUM]; + unsigned short amb_reg[STAGE_NUM]; + unsigned short sensor_val[STAGE_NUM]; + + struct ad714x_platform_data *hw; + struct ad714x_driver_data *sw; + + int irq; + struct device *dev; + ad714x_read_t read; + ad714x_write_t write; + + struct mutex mutex; + + unsigned product; + unsigned version; +}; + +static void ad714x_use_com_int(struct ad714x_chip *ad714x, + int start_stage, int end_stage) +{ + unsigned short data; + unsigned short mask; + + mask = ((1 << (end_stage + 1)) - 1) - (1 << start_stage); + + ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data); + data |= 1 << start_stage; + ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data); + + ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data); + data &= ~mask; + ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data); +} + +static void ad714x_use_thr_int(struct ad714x_chip *ad714x, + int start_stage, int end_stage) +{ + unsigned short data; + unsigned short mask; + + mask = ((1 << (end_stage + 1)) - 1) - (1 << start_stage); + + ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data); + data &= ~(1 << start_stage); + ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data); + + ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data); + data |= mask; + ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data); +} + +static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x, + int start_stage, int end_stage) +{ + int max_res = 0; + int max_idx = 0; + int i; + + for (i = start_stage; i <= end_stage; i++) { + if (ad714x->sensor_val[i] > max_res) { + max_res = ad714x->sensor_val[i]; + max_idx = i; + } + } + + return max_idx; +} + +static int ad714x_cal_abs_pos(struct ad714x_chip *ad714x, + int start_stage, int end_stage, + int highest_stage, int max_coord) +{ + int a_param, b_param; + + if (highest_stage == start_stage) { + a_param = ad714x->sensor_val[start_stage + 1]; + b_param = ad714x->sensor_val[start_stage] + + ad714x->sensor_val[start_stage + 1]; + } else if (highest_stage == end_stage) { + a_param = ad714x->sensor_val[end_stage] * + (end_stage - start_stage) + + ad714x->sensor_val[end_stage - 1] * + (end_stage - start_stage - 1); + b_param = ad714x->sensor_val[end_stage] + + ad714x->sensor_val[end_stage - 1]; + } else { + a_param = ad714x->sensor_val[highest_stage] * + (highest_stage - start_stage) + + ad714x->sensor_val[highest_stage - 1] * + (highest_stage - start_stage - 1) + + ad714x->sensor_val[highest_stage + 1] * + (highest_stage - start_stage + 1); + b_param = ad714x->sensor_val[highest_stage] + + ad714x->sensor_val[highest_stage - 1] + + ad714x->sensor_val[highest_stage + 1]; + } + + return (max_coord / (end_stage - start_stage)) * a_param / b_param; +} + +/* + * One button can connect to multi positive and negative of CDCs + * Multi-buttons can connect to same positive/negative of one CDC + */ +static void ad714x_button_state_machine(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_button_plat *hw = &ad714x->hw->button[idx]; + struct ad714x_button_drv *sw = &ad714x->sw->button[idx]; + + switch (sw->state) { + case IDLE: + if (((ad714x->h_state & hw->h_mask) == hw->h_mask) && + ((ad714x->l_state & hw->l_mask) == hw->l_mask)) { + dev_dbg(ad714x->dev, "button %d touched\n", idx); + input_report_key(sw->input, hw->keycode, 1); + input_sync(sw->input); + sw->state = ACTIVE; + } + break; + + case ACTIVE: + if (((ad714x->h_state & hw->h_mask) != hw->h_mask) || + ((ad714x->l_state & hw->l_mask) != hw->l_mask)) { + dev_dbg(ad714x->dev, "button %d released\n", idx); + input_report_key(sw->input, hw->keycode, 0); + input_sync(sw->input); + sw->state = IDLE; + } + break; + + default: + break; + } +} + +/* + * The response of a sensor is defined by the absolute number of codes + * between the current CDC value and the ambient value. + */ +static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + int i; + + for (i = hw->start_stage; i <= hw->end_stage; i++) { + ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, + &ad714x->adc_reg[i]); + ad714x->read(ad714x->dev, + STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, + &ad714x->amb_reg[i]); + + ad714x->sensor_val[i] = abs(ad714x->adc_reg[i] - + ad714x->amb_reg[i]); + } +} + +static void ad714x_slider_cal_highest_stage(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; + + sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, + hw->end_stage); + + dev_dbg(ad714x->dev, "slider %d highest_stage:%d\n", idx, + sw->highest_stage); +} + +/* + * The formulae are very straight forward. It uses the sensor with the + * highest response and the 2 adjacent ones. + * When Sensor 0 has the highest response, only sensor 0 and sensor 1 + * are used in the calculations. Similarly when the last sensor has the + * highest response, only the last sensor and the second last sensors + * are used in the calculations. + * + * For i= idx_of_peak_Sensor-1 to i= idx_of_peak_Sensor+1 + * v += Sensor response(i)*i + * w += Sensor response(i) + * POS=(Number_of_Positions_Wanted/(Number_of_Sensors_Used-1)) *(v/w) + */ +static void ad714x_slider_cal_abs_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; + + sw->abs_pos = ad714x_cal_abs_pos(ad714x, hw->start_stage, hw->end_stage, + sw->highest_stage, hw->max_coord); + + dev_dbg(ad714x->dev, "slider %d absolute position:%d\n", idx, + sw->abs_pos); +} + +/* + * To minimise the Impact of the noise on the algorithm, ADI developed a + * routine that filters the CDC results after they have been read by the + * host processor. + * The filter used is an Infinite Input Response(IIR) filter implemented + * in firmware and attenuates the noise on the CDC results after they've + * been read by the host processor. + * Filtered_CDC_result = (Filtered_CDC_result * (10 - Coefficient) + + * Latest_CDC_result * Coefficient)/10 + */ +static void ad714x_slider_cal_flt_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; + + sw->flt_pos = (sw->flt_pos * (10 - 4) + + sw->abs_pos * 4)/10; + + dev_dbg(ad714x->dev, "slider %d filter position:%d\n", idx, + sw->flt_pos); +} + +static void ad714x_slider_use_com_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + + ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); +} + +static void ad714x_slider_use_thr_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + + ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); +} + +static void ad714x_slider_state_machine(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx]; + struct ad714x_slider_drv *sw = &ad714x->sw->slider[idx]; + unsigned short h_state, c_state; + unsigned short mask; + + mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); + + h_state = ad714x->h_state & mask; + c_state = ad714x->c_state & mask; + + switch (sw->state) { + case IDLE: + if (h_state) { + sw->state = JITTER; + /* In End of Conversion interrupt mode, the AD714X + * continuously generates hardware interrupts. + */ + ad714x_slider_use_com_int(ad714x, idx); + dev_dbg(ad714x->dev, "slider %d touched\n", idx); + } + break; + + case JITTER: + if (c_state == mask) { + ad714x_slider_cal_sensor_val(ad714x, idx); + ad714x_slider_cal_highest_stage(ad714x, idx); + ad714x_slider_cal_abs_pos(ad714x, idx); + sw->flt_pos = sw->abs_pos; + sw->state = ACTIVE; + } + break; + + case ACTIVE: + if (c_state == mask) { + if (h_state) { + ad714x_slider_cal_sensor_val(ad714x, idx); + ad714x_slider_cal_highest_stage(ad714x, idx); + ad714x_slider_cal_abs_pos(ad714x, idx); + ad714x_slider_cal_flt_pos(ad714x, idx); + + input_report_abs(sw->input, ABS_X, sw->flt_pos); + input_report_key(sw->input, BTN_TOUCH, 1); + } else { + /* When the user lifts off the sensor, configure + * the AD714X back to threshold interrupt mode. + */ + ad714x_slider_use_thr_int(ad714x, idx); + sw->state = IDLE; + input_report_key(sw->input, BTN_TOUCH, 0); + dev_dbg(ad714x->dev, "slider %d released\n", + idx); + } + input_sync(sw->input); + } + break; + + default: + break; + } +} + +/* + * When the scroll wheel is activated, we compute the absolute position based + * on the sensor values. To calculate the position, we first determine the + * sensor that has the greatest response among the 8 sensors that constitutes + * the scrollwheel. Then we determined the 2 sensors on either sides of the + * sensor with the highest response and we apply weights to these sensors. + */ +static void ad714x_wheel_cal_highest_stage(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; + + sw->pre_highest_stage = sw->highest_stage; + sw->highest_stage = ad714x_cal_highest_stage(ad714x, hw->start_stage, + hw->end_stage); + + dev_dbg(ad714x->dev, "wheel %d highest_stage:%d\n", idx, + sw->highest_stage); +} + +static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + int i; + + for (i = hw->start_stage; i <= hw->end_stage; i++) { + ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, + &ad714x->adc_reg[i]); + ad714x->read(ad714x->dev, + STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, + &ad714x->amb_reg[i]); + if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) + ad714x->sensor_val[i] = ad714x->adc_reg[i] - + ad714x->amb_reg[i]; + else + ad714x->sensor_val[i] = 0; + } +} + +/* + * When the scroll wheel is activated, we compute the absolute position based + * on the sensor values. To calculate the position, we first determine the + * sensor that has the greatest response among the 8 sensors that constitutes + * the scrollwheel. Then we determined the 2 sensors on either sides of the + * sensor with the highest response and we apply weights to these sensors. The + * result of this computation gives us the mean value which defined by the + * following formula: + * For i= second_before_highest_stage to i= second_after_highest_stage + * v += Sensor response(i)*WEIGHT*(i+3) + * w += Sensor response(i) + * Mean_Value=v/w + * pos_on_scrollwheel = (Mean_Value - position_offset) / position_ratio + */ + +#define WEIGHT_FACTOR 30 +/* This constant prevents the "PositionOffset" from reaching a big value */ +#define OFFSET_POSITION_CLAMP 120 +static void ad714x_wheel_cal_abs_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; + int stage_num = hw->end_stage - hw->start_stage + 1; + int second_before, first_before, highest, first_after, second_after; + int a_param, b_param; + + /* Calculate Mean value */ + + second_before = (sw->highest_stage + stage_num - 2) % stage_num; + first_before = (sw->highest_stage + stage_num - 1) % stage_num; + highest = sw->highest_stage; + first_after = (sw->highest_stage + stage_num + 1) % stage_num; + second_after = (sw->highest_stage + stage_num + 2) % stage_num; + + if (((sw->highest_stage - hw->start_stage) > 1) && + ((hw->end_stage - sw->highest_stage) > 1)) { + a_param = ad714x->sensor_val[second_before] * + (second_before - hw->start_stage + 3) + + ad714x->sensor_val[first_before] * + (second_before - hw->start_stage + 3) + + ad714x->sensor_val[highest] * + (second_before - hw->start_stage + 3) + + ad714x->sensor_val[first_after] * + (first_after - hw->start_stage + 3) + + ad714x->sensor_val[second_after] * + (second_after - hw->start_stage + 3); + } else { + a_param = ad714x->sensor_val[second_before] * + (second_before - hw->start_stage + 1) + + ad714x->sensor_val[first_before] * + (second_before - hw->start_stage + 2) + + ad714x->sensor_val[highest] * + (second_before - hw->start_stage + 3) + + ad714x->sensor_val[first_after] * + (first_after - hw->start_stage + 4) + + ad714x->sensor_val[second_after] * + (second_after - hw->start_stage + 5); + } + a_param *= WEIGHT_FACTOR; + + b_param = ad714x->sensor_val[second_before] + + ad714x->sensor_val[first_before] + + ad714x->sensor_val[highest] + + ad714x->sensor_val[first_after] + + ad714x->sensor_val[second_after]; + + sw->pre_mean_value = sw->mean_value; + sw->mean_value = a_param / b_param; + + /* Calculate the offset */ + + if ((sw->pre_highest_stage == hw->end_stage) && + (sw->highest_stage == hw->start_stage)) + sw->pos_offset = sw->mean_value; + else if ((sw->pre_highest_stage == hw->start_stage) && + (sw->highest_stage == hw->end_stage)) + sw->pos_offset = sw->pre_mean_value; + + if (sw->pos_offset > OFFSET_POSITION_CLAMP) + sw->pos_offset = OFFSET_POSITION_CLAMP; + + /* Calculate the mean value without the offset */ + + sw->pre_mean_value_no_offset = sw->mean_value_no_offset; + sw->mean_value_no_offset = sw->mean_value - sw->pos_offset; + if (sw->mean_value_no_offset < 0) + sw->mean_value_no_offset = 0; + + /* Calculate ratio to scale down to NUMBER_OF_WANTED_POSITIONS */ + + if ((sw->pre_highest_stage == hw->end_stage) && + (sw->highest_stage == hw->start_stage)) + sw->pos_ratio = (sw->pre_mean_value_no_offset * 100) / + hw->max_coord; + else if ((sw->pre_highest_stage == hw->start_stage) && + (sw->highest_stage == hw->end_stage)) + sw->pos_ratio = (sw->mean_value_no_offset * 100) / + hw->max_coord; + sw->abs_pos = (sw->mean_value_no_offset * 100) / sw->pos_ratio; + if (sw->abs_pos > hw->max_coord) + sw->abs_pos = hw->max_coord; +} + +static void ad714x_wheel_cal_flt_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; + if (((sw->pre_highest_stage == hw->end_stage) && + (sw->highest_stage == hw->start_stage)) || + ((sw->pre_highest_stage == hw->start_stage) && + (sw->highest_stage == hw->end_stage))) + sw->flt_pos = sw->abs_pos; + else + sw->flt_pos = ((sw->flt_pos * 30) + (sw->abs_pos * 71)) / 100; + + if (sw->flt_pos > hw->max_coord) + sw->flt_pos = hw->max_coord; +} + +static void ad714x_wheel_use_com_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + + ad714x_use_com_int(ad714x, hw->start_stage, hw->end_stage); +} + +static void ad714x_wheel_use_thr_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + + ad714x_use_thr_int(ad714x, hw->start_stage, hw->end_stage); +} + +static void ad714x_wheel_state_machine(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx]; + struct ad714x_wheel_drv *sw = &ad714x->sw->wheel[idx]; + unsigned short h_state, c_state; + unsigned short mask; + + mask = ((1 << (hw->end_stage + 1)) - 1) - ((1 << hw->start_stage) - 1); + + h_state = ad714x->h_state & mask; + c_state = ad714x->c_state & mask; + + switch (sw->state) { + case IDLE: + if (h_state) { + sw->state = JITTER; + /* In End of Conversion interrupt mode, the AD714X + * continuously generates hardware interrupts. + */ + ad714x_wheel_use_com_int(ad714x, idx); + dev_dbg(ad714x->dev, "wheel %d touched\n", idx); + } + break; + + case JITTER: + if (c_state == mask) { + ad714x_wheel_cal_sensor_val(ad714x, idx); + ad714x_wheel_cal_highest_stage(ad714x, idx); + ad714x_wheel_cal_abs_pos(ad714x, idx); + sw->flt_pos = sw->abs_pos; + sw->state = ACTIVE; + } + break; + + case ACTIVE: + if (c_state == mask) { + if (h_state) { + ad714x_wheel_cal_sensor_val(ad714x, idx); + ad714x_wheel_cal_highest_stage(ad714x, idx); + ad714x_wheel_cal_abs_pos(ad714x, idx); + ad714x_wheel_cal_flt_pos(ad714x, idx); + + input_report_abs(sw->input, ABS_WHEEL, + sw->abs_pos); + input_report_key(sw->input, BTN_TOUCH, 1); + } else { + /* When the user lifts off the sensor, configure + * the AD714X back to threshold interrupt mode. + */ + ad714x_wheel_use_thr_int(ad714x, idx); + sw->state = IDLE; + input_report_key(sw->input, BTN_TOUCH, 0); + + dev_dbg(ad714x->dev, "wheel %d released\n", + idx); + } + input_sync(sw->input); + } + break; + + default: + break; + } +} + +static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + int i; + + for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) { + ad714x->read(ad714x->dev, CDC_RESULT_S0 + i, + &ad714x->adc_reg[i]); + ad714x->read(ad714x->dev, + STAGE0_AMBIENT + i * PER_STAGE_REG_NUM, + &ad714x->amb_reg[i]); + if (ad714x->adc_reg[i] > ad714x->amb_reg[i]) + ad714x->sensor_val[i] = ad714x->adc_reg[i] - + ad714x->amb_reg[i]; + else + ad714x->sensor_val[i] = 0; + } +} + +static void touchpad_cal_highest_stage(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + + sw->x_highest_stage = ad714x_cal_highest_stage(ad714x, + hw->x_start_stage, hw->x_end_stage); + sw->y_highest_stage = ad714x_cal_highest_stage(ad714x, + hw->y_start_stage, hw->y_end_stage); + + dev_dbg(ad714x->dev, + "touchpad %d x_highest_stage:%d, y_highest_stage:%d\n", + idx, sw->x_highest_stage, sw->y_highest_stage); +} + +/* + * If 2 fingers are touching the sensor then 2 peaks can be observed in the + * distribution. + * The arithmetic doesn't support to get absolute coordinates for multi-touch + * yet. + */ +static int touchpad_check_second_peak(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + int i; + + for (i = hw->x_start_stage; i < sw->x_highest_stage; i++) { + if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) + > (ad714x->sensor_val[i + 1] / 10)) + return 1; + } + + for (i = sw->x_highest_stage; i < hw->x_end_stage; i++) { + if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) + > (ad714x->sensor_val[i] / 10)) + return 1; + } + + for (i = hw->y_start_stage; i < sw->y_highest_stage; i++) { + if ((ad714x->sensor_val[i] - ad714x->sensor_val[i + 1]) + > (ad714x->sensor_val[i + 1] / 10)) + return 1; + } + + for (i = sw->y_highest_stage; i < hw->y_end_stage; i++) { + if ((ad714x->sensor_val[i + 1] - ad714x->sensor_val[i]) + > (ad714x->sensor_val[i] / 10)) + return 1; + } + + return 0; +} + +/* + * If only one finger is used to activate the touch pad then only 1 peak will be + * registered in the distribution. This peak and the 2 adjacent sensors will be + * used in the calculation of the absolute position. This will prevent hand + * shadows to affect the absolute position calculation. + */ +static void touchpad_cal_abs_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + + sw->x_abs_pos = ad714x_cal_abs_pos(ad714x, hw->x_start_stage, + hw->x_end_stage, sw->x_highest_stage, hw->x_max_coord); + sw->y_abs_pos = ad714x_cal_abs_pos(ad714x, hw->y_start_stage, + hw->y_end_stage, sw->y_highest_stage, hw->y_max_coord); + + dev_dbg(ad714x->dev, "touchpad %d absolute position:(%d, %d)\n", idx, + sw->x_abs_pos, sw->y_abs_pos); +} + +static void touchpad_cal_flt_pos(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + + sw->x_flt_pos = (sw->x_flt_pos * (10 - 4) + + sw->x_abs_pos * 4)/10; + sw->y_flt_pos = (sw->y_flt_pos * (10 - 4) + + sw->y_abs_pos * 4)/10; + + dev_dbg(ad714x->dev, "touchpad %d filter position:(%d, %d)\n", + idx, sw->x_flt_pos, sw->y_flt_pos); +} + +/* + * To prevent distortion from showing in the absolute position, it is + * necessary to detect the end points. When endpoints are detected, the + * driver stops updating the status variables with absolute positions. + * End points are detected on the 4 edges of the touchpad sensor. The + * method to detect them is the same for all 4. + * To detect the end points, the firmware computes the difference in + * percent between the sensor on the edge and the adjacent one. The + * difference is calculated in percent in order to make the end point + * detection independent of the pressure. + */ + +#define LEFT_END_POINT_DETECTION_LEVEL 550 +#define RIGHT_END_POINT_DETECTION_LEVEL 750 +#define LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL 850 +#define TOP_END_POINT_DETECTION_LEVEL 550 +#define BOTTOM_END_POINT_DETECTION_LEVEL 950 +#define TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL 700 +static int touchpad_check_endpoint(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + int percent_sensor_diff; + + /* left endpoint detect */ + percent_sensor_diff = (ad714x->sensor_val[hw->x_start_stage] - + ad714x->sensor_val[hw->x_start_stage + 1]) * 100 / + ad714x->sensor_val[hw->x_start_stage + 1]; + if (!sw->left_ep) { + if (percent_sensor_diff >= LEFT_END_POINT_DETECTION_LEVEL) { + sw->left_ep = 1; + sw->left_ep_val = + ad714x->sensor_val[hw->x_start_stage + 1]; + } + } else { + if ((percent_sensor_diff < LEFT_END_POINT_DETECTION_LEVEL) && + (ad714x->sensor_val[hw->x_start_stage + 1] > + LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->left_ep_val)) + sw->left_ep = 0; + } + + /* right endpoint detect */ + percent_sensor_diff = (ad714x->sensor_val[hw->x_end_stage] - + ad714x->sensor_val[hw->x_end_stage - 1]) * 100 / + ad714x->sensor_val[hw->x_end_stage - 1]; + if (!sw->right_ep) { + if (percent_sensor_diff >= RIGHT_END_POINT_DETECTION_LEVEL) { + sw->right_ep = 1; + sw->right_ep_val = + ad714x->sensor_val[hw->x_end_stage - 1]; + } + } else { + if ((percent_sensor_diff < RIGHT_END_POINT_DETECTION_LEVEL) && + (ad714x->sensor_val[hw->x_end_stage - 1] > + LEFT_RIGHT_END_POINT_DEAVTIVALION_LEVEL + sw->right_ep_val)) + sw->right_ep = 0; + } + + /* top endpoint detect */ + percent_sensor_diff = (ad714x->sensor_val[hw->y_start_stage] - + ad714x->sensor_val[hw->y_start_stage + 1]) * 100 / + ad714x->sensor_val[hw->y_start_stage + 1]; + if (!sw->top_ep) { + if (percent_sensor_diff >= TOP_END_POINT_DETECTION_LEVEL) { + sw->top_ep = 1; + sw->top_ep_val = + ad714x->sensor_val[hw->y_start_stage + 1]; + } + } else { + if ((percent_sensor_diff < TOP_END_POINT_DETECTION_LEVEL) && + (ad714x->sensor_val[hw->y_start_stage + 1] > + TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->top_ep_val)) + sw->top_ep = 0; + } + + /* bottom endpoint detect */ + percent_sensor_diff = (ad714x->sensor_val[hw->y_end_stage] - + ad714x->sensor_val[hw->y_end_stage - 1]) * 100 / + ad714x->sensor_val[hw->y_end_stage - 1]; + if (!sw->bottom_ep) { + if (percent_sensor_diff >= BOTTOM_END_POINT_DETECTION_LEVEL) { + sw->bottom_ep = 1; + sw->bottom_ep_val = + ad714x->sensor_val[hw->y_end_stage - 1]; + } + } else { + if ((percent_sensor_diff < BOTTOM_END_POINT_DETECTION_LEVEL) && + (ad714x->sensor_val[hw->y_end_stage - 1] > + TOP_BOTTOM_END_POINT_DEAVTIVALION_LEVEL + sw->bottom_ep_val)) + sw->bottom_ep = 0; + } + + return sw->left_ep || sw->right_ep || sw->top_ep || sw->bottom_ep; +} + +static void touchpad_use_com_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + + ad714x_use_com_int(ad714x, hw->x_start_stage, hw->x_end_stage); +} + +static void touchpad_use_thr_int(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + + ad714x_use_thr_int(ad714x, hw->x_start_stage, hw->x_end_stage); + ad714x_use_thr_int(ad714x, hw->y_start_stage, hw->y_end_stage); +} + +static void ad714x_touchpad_state_machine(struct ad714x_chip *ad714x, int idx) +{ + struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx]; + struct ad714x_touchpad_drv *sw = &ad714x->sw->touchpad[idx]; + unsigned short h_state, c_state; + unsigned short mask; + + mask = (((1 << (hw->x_end_stage + 1)) - 1) - + ((1 << hw->x_start_stage) - 1)) + + (((1 << (hw->y_end_stage + 1)) - 1) - + ((1 << hw->y_start_stage) - 1)); + + h_state = ad714x->h_state & mask; + c_state = ad714x->c_state & mask; + + switch (sw->state) { + case IDLE: + if (h_state) { + sw->state = JITTER; + /* In End of Conversion interrupt mode, the AD714X + * continuously generates hardware interrupts. + */ + touchpad_use_com_int(ad714x, idx); + dev_dbg(ad714x->dev, "touchpad %d touched\n", idx); + } + break; + + case JITTER: + if (c_state == mask) { + touchpad_cal_sensor_val(ad714x, idx); + touchpad_cal_highest_stage(ad714x, idx); + if ((!touchpad_check_second_peak(ad714x, idx)) && + (!touchpad_check_endpoint(ad714x, idx))) { + dev_dbg(ad714x->dev, + "touchpad%d, 2 fingers or endpoint\n", + idx); + touchpad_cal_abs_pos(ad714x, idx); + sw->x_flt_pos = sw->x_abs_pos; + sw->y_flt_pos = sw->y_abs_pos; + sw->state = ACTIVE; + } + } + break; + + case ACTIVE: + if (c_state == mask) { + if (h_state) { + touchpad_cal_sensor_val(ad714x, idx); + touchpad_cal_highest_stage(ad714x, idx); + if ((!touchpad_check_second_peak(ad714x, idx)) + && (!touchpad_check_endpoint(ad714x, idx))) { + touchpad_cal_abs_pos(ad714x, idx); + touchpad_cal_flt_pos(ad714x, idx); + input_report_abs(sw->input, ABS_X, + sw->x_flt_pos); + input_report_abs(sw->input, ABS_Y, + sw->y_flt_pos); + input_report_key(sw->input, BTN_TOUCH, + 1); + } + } else { + /* When the user lifts off the sensor, configure + * the AD714X back to threshold interrupt mode. + */ + touchpad_use_thr_int(ad714x, idx); + sw->state = IDLE; + input_report_key(sw->input, BTN_TOUCH, 0); + dev_dbg(ad714x->dev, "touchpad %d released\n", + idx); + } + input_sync(sw->input); + } + break; + + default: + break; + } +} + +static int ad714x_hw_detect(struct ad714x_chip *ad714x) +{ + unsigned short data; + + ad714x->read(ad714x->dev, AD714X_PARTID_REG, &data); + switch (data & 0xFFF0) { + case AD7147_PARTID: + ad714x->product = 0x7147; + ad714x->version = data & 0xF; + dev_info(ad714x->dev, "found AD7147 captouch, rev:%d\n", + ad714x->version); + return 0; + + case AD7142_PARTID: + ad714x->product = 0x7142; + ad714x->version = data & 0xF; + dev_info(ad714x->dev, "found AD7142 captouch, rev:%d\n", + ad714x->version); + return 0; + + default: + dev_err(ad714x->dev, + "fail to detect AD714X captouch, read ID is %04x\n", + data); + return -ENODEV; + } +} + +static void ad714x_hw_init(struct ad714x_chip *ad714x) +{ + int i, j; + unsigned short reg_base; + unsigned short data; + + /* configuration CDC and interrupts */ + + for (i = 0; i < STAGE_NUM; i++) { + reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM; + for (j = 0; j < STAGE_CFGREG_NUM; j++) + ad714x->write(ad714x->dev, reg_base + j, + ad714x->hw->stage_cfg_reg[i][j]); + } + + for (i = 0; i < SYS_CFGREG_NUM; i++) + ad714x->write(ad714x->dev, AD714X_SYSCFG_REG + i, + ad714x->hw->sys_cfg_reg[i]); + for (i = 0; i < SYS_CFGREG_NUM; i++) + ad714x->read(ad714x->dev, AD714X_SYSCFG_REG + i, + &data); + + ad714x->write(ad714x->dev, AD714X_STG_CAL_EN_REG, 0xFFF); + + /* clear all interrupts */ + ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data); + ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data); + ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data); +} + +static irqreturn_t ad714x_interrupt_thread(int irq, void *data) +{ + struct ad714x_chip *ad714x = data; + int i; + + mutex_lock(&ad714x->mutex); + + ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &ad714x->l_state); + ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &ad714x->h_state); + ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &ad714x->c_state); + + for (i = 0; i < ad714x->hw->button_num; i++) + ad714x_button_state_machine(ad714x, i); + for (i = 0; i < ad714x->hw->slider_num; i++) + ad714x_slider_state_machine(ad714x, i); + for (i = 0; i < ad714x->hw->wheel_num; i++) + ad714x_wheel_state_machine(ad714x, i); + for (i = 0; i < ad714x->hw->touchpad_num; i++) + ad714x_touchpad_state_machine(ad714x, i); + + mutex_unlock(&ad714x->mutex); + + return IRQ_HANDLED; +} + +#define MAX_DEVICE_NUM 8 +struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq, + ad714x_read_t read, ad714x_write_t write) +{ + int i, alloc_idx; + int error; + struct input_dev *input[MAX_DEVICE_NUM]; + + struct ad714x_platform_data *plat_data = dev->platform_data; + struct ad714x_chip *ad714x; + void *drv_mem; + + struct ad714x_button_drv *bt_drv; + struct ad714x_slider_drv *sd_drv; + struct ad714x_wheel_drv *wl_drv; + struct ad714x_touchpad_drv *tp_drv; + + + if (irq <= 0) { + dev_err(dev, "IRQ not configured!\n"); + error = -EINVAL; + goto err_out; + } + + if (dev->platform_data == NULL) { + dev_err(dev, "platform data for ad714x doesn't exist\n"); + error = -EINVAL; + goto err_out; + } + + ad714x = kzalloc(sizeof(*ad714x) + sizeof(*ad714x->sw) + + sizeof(*sd_drv) * plat_data->slider_num + + sizeof(*wl_drv) * plat_data->wheel_num + + sizeof(*tp_drv) * plat_data->touchpad_num + + sizeof(*bt_drv) * plat_data->button_num, GFP_KERNEL); + if (!ad714x) { + error = -ENOMEM; + goto err_out; + } + + ad714x->hw = plat_data; + + drv_mem = ad714x + 1; + ad714x->sw = drv_mem; + drv_mem += sizeof(*ad714x->sw); + ad714x->sw->slider = sd_drv = drv_mem; + drv_mem += sizeof(*sd_drv) * ad714x->hw->slider_num; + ad714x->sw->wheel = wl_drv = drv_mem; + drv_mem += sizeof(*wl_drv) * ad714x->hw->wheel_num; + ad714x->sw->touchpad = tp_drv = drv_mem; + drv_mem += sizeof(*tp_drv) * ad714x->hw->touchpad_num; + ad714x->sw->button = bt_drv = drv_mem; + drv_mem += sizeof(*bt_drv) * ad714x->hw->button_num; + + ad714x->read = read; + ad714x->write = write; + ad714x->irq = irq; + ad714x->dev = dev; + + error = ad714x_hw_detect(ad714x); + if (error) + goto err_free_mem; + + /* initilize and request sw/hw resources */ + + ad714x_hw_init(ad714x); + mutex_init(&ad714x->mutex); + + /* + * Allocate and register AD714X input device + */ + alloc_idx = 0; + + /* a slider uses one input_dev instance */ + if (ad714x->hw->slider_num > 0) { + struct ad714x_slider_plat *sd_plat = ad714x->hw->slider; + + for (i = 0; i < ad714x->hw->slider_num; i++) { + sd_drv[i].input = input[alloc_idx] = input_allocate_device(); + if (!input[alloc_idx]) { + error = -ENOMEM; + goto err_free_dev; + } + + __set_bit(EV_ABS, input[alloc_idx]->evbit); + __set_bit(EV_KEY, input[alloc_idx]->evbit); + __set_bit(ABS_X, input[alloc_idx]->absbit); + __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); + input_set_abs_params(input[alloc_idx], + ABS_X, 0, sd_plat->max_coord, 0, 0); + + input[alloc_idx]->id.bustype = bus_type; + input[alloc_idx]->id.product = ad714x->product; + input[alloc_idx]->id.version = ad714x->version; + + error = input_register_device(input[alloc_idx]); + if (error) + goto err_free_dev; + + alloc_idx++; + } + } + + /* a wheel uses one input_dev instance */ + if (ad714x->hw->wheel_num > 0) { + struct ad714x_wheel_plat *wl_plat = ad714x->hw->wheel; + + for (i = 0; i < ad714x->hw->wheel_num; i++) { + wl_drv[i].input = input[alloc_idx] = input_allocate_device(); + if (!input[alloc_idx]) { + error = -ENOMEM; + goto err_free_dev; + } + + __set_bit(EV_KEY, input[alloc_idx]->evbit); + __set_bit(EV_ABS, input[alloc_idx]->evbit); + __set_bit(ABS_WHEEL, input[alloc_idx]->absbit); + __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); + input_set_abs_params(input[alloc_idx], + ABS_WHEEL, 0, wl_plat->max_coord, 0, 0); + + input[alloc_idx]->id.bustype = bus_type; + input[alloc_idx]->id.product = ad714x->product; + input[alloc_idx]->id.version = ad714x->version; + + error = input_register_device(input[alloc_idx]); + if (error) + goto err_free_dev; + + alloc_idx++; + } + } + + /* a touchpad uses one input_dev instance */ + if (ad714x->hw->touchpad_num > 0) { + struct ad714x_touchpad_plat *tp_plat = ad714x->hw->touchpad; + + for (i = 0; i < ad714x->hw->touchpad_num; i++) { + tp_drv[i].input = input[alloc_idx] = input_allocate_device(); + if (!input[alloc_idx]) { + error = -ENOMEM; + goto err_free_dev; + } + + __set_bit(EV_ABS, input[alloc_idx]->evbit); + __set_bit(EV_KEY, input[alloc_idx]->evbit); + __set_bit(ABS_X, input[alloc_idx]->absbit); + __set_bit(ABS_Y, input[alloc_idx]->absbit); + __set_bit(BTN_TOUCH, input[alloc_idx]->keybit); + input_set_abs_params(input[alloc_idx], + ABS_X, 0, tp_plat->x_max_coord, 0, 0); + input_set_abs_params(input[alloc_idx], + ABS_Y, 0, tp_plat->y_max_coord, 0, 0); + + input[alloc_idx]->id.bustype = bus_type; + input[alloc_idx]->id.product = ad714x->product; + input[alloc_idx]->id.version = ad714x->version; + + error = input_register_device(input[alloc_idx]); + if (error) + goto err_free_dev; + + alloc_idx++; + } + } + + /* all buttons use one input node */ + if (ad714x->hw->button_num > 0) { + struct ad714x_button_plat *bt_plat = ad714x->hw->button; + + input[alloc_idx] = input_allocate_device(); + if (!input[alloc_idx]) { + error = -ENOMEM; + goto err_free_dev; + } + + __set_bit(EV_KEY, input[alloc_idx]->evbit); + for (i = 0; i < ad714x->hw->button_num; i++) { + bt_drv[i].input = input[alloc_idx]; + __set_bit(bt_plat[i].keycode, input[alloc_idx]->keybit); + } + + input[alloc_idx]->id.bustype = bus_type; + input[alloc_idx]->id.product = ad714x->product; + input[alloc_idx]->id.version = ad714x->version; + + error = input_register_device(input[alloc_idx]); + if (error) + goto err_free_dev; + + alloc_idx++; + } + + error = request_threaded_irq(ad714x->irq, NULL, ad714x_interrupt_thread, + IRQF_TRIGGER_FALLING, "ad714x_captouch", ad714x); + if (error) { + dev_err(dev, "can't allocate irq %d\n", ad714x->irq); + goto err_unreg_dev; + } + + return ad714x; + + err_free_dev: + dev_err(dev, "failed to setup AD714x input device %i\n", alloc_idx); + input_free_device(input[alloc_idx]); + err_unreg_dev: + while (--alloc_idx >= 0) + input_unregister_device(input[alloc_idx]); + err_free_mem: + kfree(ad714x); + err_out: + return ERR_PTR(error); +} +EXPORT_SYMBOL(ad714x_probe); + +void ad714x_remove(struct ad714x_chip *ad714x) +{ + struct ad714x_platform_data *hw = ad714x->hw; + struct ad714x_driver_data *sw = ad714x->sw; + int i; + + free_irq(ad714x->irq, ad714x); + + /* unregister and free all input devices */ + + for (i = 0; i < hw->slider_num; i++) + input_unregister_device(sw->slider[i].input); + + for (i = 0; i < hw->wheel_num; i++) + input_unregister_device(sw->wheel[i].input); + + for (i = 0; i < hw->touchpad_num; i++) + input_unregister_device(sw->touchpad[i].input); + + if (hw->button_num) + input_unregister_device(sw->button[0].input); + + kfree(ad714x); +} +EXPORT_SYMBOL(ad714x_remove); + +#ifdef CONFIG_PM +int ad714x_disable(struct ad714x_chip *ad714x) +{ + unsigned short data; + + dev_dbg(ad714x->dev, "%s enter\n", __func__); + + mutex_lock(&ad714x->mutex); + + data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3; + ad714x->write(ad714x->dev, AD714X_PWR_CTRL, data); + + mutex_unlock(&ad714x->mutex); + + return 0; +} +EXPORT_SYMBOL(ad714x_disable); + +int ad714x_enable(struct ad714x_chip *ad714x) +{ + unsigned short data; + + dev_dbg(ad714x->dev, "%s enter\n", __func__); + + mutex_lock(&ad714x->mutex); + + /* resume to non-shutdown mode */ + + ad714x->write(ad714x->dev, AD714X_PWR_CTRL, + ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]); + + /* make sure the interrupt output line is not low level after resume, + * otherwise we will get no chance to enter falling-edge irq again + */ + + ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data); + ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data); + ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data); + + mutex_unlock(&ad714x->mutex); + + return 0; +} +EXPORT_SYMBOL(ad714x_enable); +#endif + +MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor Driver"); +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/input/misc/ad714x.h b/drivers/input/misc/ad714x.h new file mode 100644 index 000000000000..45c54fb13f07 --- /dev/null +++ b/drivers/input/misc/ad714x.h @@ -0,0 +1,26 @@ +/* + * AD714X CapTouch Programmable Controller driver (bus interfaces) + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#ifndef _AD714X_H_ +#define _AD714X_H_ + +#include + +struct device; +struct ad714x_chip; + +typedef int (*ad714x_read_t)(struct device *, unsigned short, unsigned short *); +typedef int (*ad714x_write_t)(struct device *, unsigned short, unsigned short); + +int ad714x_disable(struct ad714x_chip *ad714x); +int ad714x_enable(struct ad714x_chip *ad714x); +struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq, + ad714x_read_t read, ad714x_write_t write); +void ad714x_remove(struct ad714x_chip *ad714x); + +#endif diff --git a/include/linux/input.h b/include/linux/input.h index 7ed2251b33f1..83524e4f3290 100644 --- a/include/linux/input.h +++ b/include/linux/input.h @@ -806,6 +806,7 @@ struct input_absinfo { #define BUS_HOST 0x19 #define BUS_GSC 0x1A #define BUS_ATARI 0x1B +#define BUS_SPI 0x1C /* * MT_TOOL types diff --git a/include/linux/input/ad714x.h b/include/linux/input/ad714x.h new file mode 100644 index 000000000000..0cbe5e81482e --- /dev/null +++ b/include/linux/input/ad714x.h @@ -0,0 +1,63 @@ +/* + * include/linux/input/ad714x.h + * + * AD714x is very flexible, it can be used as buttons, scrollwheel, + * slider, touchpad at the same time. That depends on the boards. + * The platform_data for the device's "struct device" holds this + * information. + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#ifndef __LINUX_INPUT_AD714X_H__ +#define __LINUX_INPUT_AD714X_H__ + +#define STAGE_NUM 12 +#define STAGE_CFGREG_NUM 8 +#define SYS_CFGREG_NUM 8 + +/* board information which need be initialized in arch/mach... */ +struct ad714x_slider_plat { + int start_stage; + int end_stage; + int max_coord; +}; + +struct ad714x_wheel_plat { + int start_stage; + int end_stage; + int max_coord; +}; + +struct ad714x_touchpad_plat { + int x_start_stage; + int x_end_stage; + int x_max_coord; + + int y_start_stage; + int y_end_stage; + int y_max_coord; +}; + +struct ad714x_button_plat { + int keycode; + unsigned short l_mask; + unsigned short h_mask; +}; + +struct ad714x_platform_data { + int slider_num; + int wheel_num; + int touchpad_num; + int button_num; + struct ad714x_slider_plat *slider; + struct ad714x_wheel_plat *wheel; + struct ad714x_touchpad_plat *touchpad; + struct ad714x_button_plat *button; + unsigned short stage_cfg_reg[STAGE_NUM][STAGE_CFGREG_NUM]; + unsigned short sys_cfg_reg[SYS_CFGREG_NUM]; +}; + +#endif -- cgit v1.2.3 From 752599667048898b6969e06e4637f906b04ec752 Mon Sep 17 00:00:00 2001 From: Todd Fischer Date: Mon, 5 Apr 2010 17:53:12 -0600 Subject: input: Touchscreen driver for TPS6507x Add touch screen input driver for TPS6507x family of multi-function chips. Uses the TPS6507x MFD driver. No interrupt support due to testing limitations of current hardware. Signed-off-by: Todd Fischer Signed-off-by: Samuel Ortiz --- drivers/input/touchscreen/Kconfig | 13 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/tps6507x-ts.c | 400 ++++++++++++++++++++++++++++++++ drivers/mfd/tps6507x.c | 3 + include/linux/input/tps6507x-ts.h | 24 ++ include/linux/mfd/tps6507x.h | 2 + 6 files changed, 443 insertions(+) create mode 100644 drivers/input/touchscreen/tps6507x-ts.c create mode 100644 include/linux/input/tps6507x-ts.h (limited to 'include/linux/input') diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index b9f58ca82fd1..6703c6b9800a 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -590,4 +590,17 @@ config TOUCHSCREEN_PCAP To compile this driver as a module, choose M here: the module will be called pcap_ts. + +config TOUCHSCREEN_TPS6507X + tristate "TPS6507x based touchscreens" + depends on I2C + help + Say Y here if you have a TPS6507x based touchscreen + controller. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called tps6507x_ts. + endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 8ad36eef90a2..497964a7a214 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -46,3 +46,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o +obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o diff --git a/drivers/input/touchscreen/tps6507x-ts.c b/drivers/input/touchscreen/tps6507x-ts.c new file mode 100644 index 000000000000..5de80a1a730b --- /dev/null +++ b/drivers/input/touchscreen/tps6507x-ts.c @@ -0,0 +1,400 @@ +/* + * drivers/input/touchscreen/tps6507x_ts.c + * + * Touchscreen driver for the tps6507x chip. + * + * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com) + * + * Credits: + * + * Using code from tsc2007, MtekVision Co., Ltd. + * + * For licencing details see kernel-base/COPYING + * + * TPS65070, TPS65073, TPS650731, and TPS650732 support + * 10 bit touch screen interface. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */ +#define TPS_DEFAULT_MIN_PRESSURE 0x30 +#define MAX_10BIT ((1 << 10) - 1) + +#define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \ + TPS6507X_ADCONFIG_START_CONVERSION | \ + TPS6507X_ADCONFIG_INPUT_REAL_TSC) +#define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC) + +struct ts_event { + u16 x; + u16 y; + u16 pressure; +}; + +struct tps6507x_ts { + struct input_dev *input_dev; + struct device *dev; + char phys[32]; + struct workqueue_struct *wq; + struct delayed_work work; + unsigned polling; /* polling is active */ + struct ts_event tc; + struct tps6507x_dev *mfd; + u16 model; + unsigned pendown; + int irq; + void (*clear_penirq)(void); + unsigned long poll_period; /* ms */ + u16 min_pressure; + int vref; /* non-zero to leave vref on */ +}; + +static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data) +{ + int err; + + err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data); + + if (err) + return err; + + return 0; +} + +static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data) +{ + return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data); +} + +static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc, + u8 tsc_mode, u16 *value) +{ + s32 ret; + u8 adc_status; + u8 result; + + /* Route input signal to A/D converter */ + + ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode); + if (ret) { + dev_err(tsc->dev, "TSC mode read failed\n"); + goto err; + } + + /* Start A/D conversion */ + + ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, + TPS6507X_ADCONFIG_CONVERT_TS); + if (ret) { + dev_err(tsc->dev, "ADC config write failed\n"); + return ret; + } + + do { + ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG, + &adc_status); + if (ret) { + dev_err(tsc->dev, "ADC config read failed\n"); + goto err; + } + } while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION); + + ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result); + if (ret) { + dev_err(tsc->dev, "ADC result 2 read failed\n"); + goto err; + } + + *value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8; + + ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result); + if (ret) { + dev_err(tsc->dev, "ADC result 1 read failed\n"); + goto err; + } + + *value |= result; + + dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value); + +err: + return ret; +} + +/* Need to call tps6507x_adc_standby() after using A/D converter for the + * touch screen interrupt to work properly. + */ + +static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc) +{ + s32 ret; + s32 loops = 0; + u8 val; + + ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG, + TPS6507X_ADCONFIG_INPUT_TSC); + if (ret) + return ret; + + ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, + TPS6507X_TSCMODE_STANDBY); + if (ret) + return ret; + + ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); + if (ret) + return ret; + + while (val & TPS6507X_REG_TSC_INT) { + mdelay(10); + ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val); + if (ret) + return ret; + loops++; + } + + return ret; +} + +static void tps6507x_ts_handler(struct work_struct *work) +{ + struct tps6507x_ts *tsc = container_of(work, + struct tps6507x_ts, work.work); + struct input_dev *input_dev = tsc->input_dev; + int pendown; + int schd; + int poll = 0; + s32 ret; + + ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE, + &tsc->tc.pressure); + if (ret) + goto done; + + pendown = tsc->tc.pressure > tsc->min_pressure; + + if (unlikely(!pendown && tsc->pendown)) { + dev_dbg(tsc->dev, "UP\n"); + input_report_key(input_dev, BTN_TOUCH, 0); + input_report_abs(input_dev, ABS_PRESSURE, 0); + input_sync(input_dev); + tsc->pendown = 0; + } + + if (pendown) { + + if (!tsc->pendown) { + dev_dbg(tsc->dev, "DOWN\n"); + input_report_key(input_dev, BTN_TOUCH, 1); + } else + dev_dbg(tsc->dev, "still down\n"); + + ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION, + &tsc->tc.x); + if (ret) + goto done; + + ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION, + &tsc->tc.y); + if (ret) + goto done; + + input_report_abs(input_dev, ABS_X, tsc->tc.x); + input_report_abs(input_dev, ABS_Y, tsc->tc.y); + input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure); + input_sync(input_dev); + tsc->pendown = 1; + poll = 1; + } + +done: + /* always poll if not using interrupts */ + poll = 1; + + if (poll) { + schd = queue_delayed_work(tsc->wq, &tsc->work, + tsc->poll_period * HZ / 1000); + if (schd) + tsc->polling = 1; + else { + tsc->polling = 0; + dev_err(tsc->dev, "re-schedule failed"); + } + } else + tsc->polling = 0; + + ret = tps6507x_adc_standby(tsc); +} + +static int tps6507x_ts_probe(struct platform_device *pdev) +{ + int error; + struct tps6507x_ts *tsc; + struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent); + struct touchscreen_init_data *init_data; + struct input_dev *input_dev; + struct tps6507x_board *tps_board; + int schd; + + /** + * tps_board points to pmic related constants + * coming from the board-evm file. + */ + + tps_board = (struct tps6507x_board *)tps6507x_dev->dev->platform_data; + + if (!tps_board) { + dev_err(tps6507x_dev->dev, + "Could not find tps6507x platform data\n"); + return -EIO; + } + + /** + * init_data points to array of regulator_init structures + * coming from the board-evm file. + */ + + init_data = tps_board->tps6507x_ts_init_data; + + tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL); + if (!tsc) { + dev_err(tps6507x_dev->dev, "failed to allocate driver data\n"); + error = -ENOMEM; + goto err0; + } + + tps6507x_dev->ts = tsc; + tsc->mfd = tps6507x_dev; + tsc->dev = tps6507x_dev->dev; + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(tsc->dev, "Failed to allocate input device.\n"); + error = -ENOMEM; + goto err1; + } + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + + input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0); + input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0); + + input_dev->name = "TPS6507x Touchscreen"; + input_dev->id.bustype = BUS_I2C; + input_dev->dev.parent = tsc->dev; + + snprintf(tsc->phys, sizeof(tsc->phys), + "%s/input0", dev_name(tsc->dev)); + input_dev->phys = tsc->phys; + + dev_dbg(tsc->dev, "device: %s\n", input_dev->phys); + + input_set_drvdata(input_dev, tsc); + + tsc->input_dev = input_dev; + + INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler); + tsc->wq = create_workqueue("TPS6507x Touchscreen"); + + if (init_data) { + tsc->poll_period = init_data->poll_period; + tsc->vref = init_data->vref; + tsc->min_pressure = init_data->min_pressure; + input_dev->id.vendor = init_data->vendor; + input_dev->id.product = init_data->product; + input_dev->id.version = init_data->version; + } else { + tsc->poll_period = TSC_DEFAULT_POLL_PERIOD; + tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE; + } + + error = tps6507x_adc_standby(tsc); + if (error) + goto err2; + + error = input_register_device(input_dev); + if (error) + goto err2; + + schd = queue_delayed_work(tsc->wq, &tsc->work, + tsc->poll_period * HZ / 1000); + + if (schd) + tsc->polling = 1; + else { + tsc->polling = 0; + dev_err(tsc->dev, "schedule failed"); + goto err2; + } + + return 0; + +err2: + cancel_delayed_work(&tsc->work); + flush_workqueue(tsc->wq); + destroy_workqueue(tsc->wq); + tsc->wq = 0; + input_free_device(input_dev); +err1: + kfree(tsc); + tps6507x_dev->ts = NULL; +err0: + return error; +} + +static int __devexit tps6507x_ts_remove(struct platform_device *pdev) +{ + struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev); + struct tps6507x_ts *tsc = tps6507x_dev->ts; + struct input_dev *input_dev = tsc->input_dev; + + if (!tsc) + return 0; + + cancel_delayed_work(&tsc->work); + flush_workqueue(tsc->wq); + destroy_workqueue(tsc->wq); + tsc->wq = 0; + + input_free_device(input_dev); + + tps6507x_dev->ts = NULL; + kfree(tsc); + + return 0; +} + +static struct platform_driver tps6507x_ts_driver = { + .driver = { + .name = "tps6507x-ts", + .owner = THIS_MODULE, + }, + .probe = tps6507x_ts_probe, + .remove = __devexit_p(tps6507x_ts_remove), +}; + +static int __init tps6507x_ts_init(void) +{ + return platform_driver_register(&tps6507x_ts_driver); +} +module_init(tps6507x_ts_init); + +static void __exit tps6507x_ts_exit(void) +{ + platform_driver_unregister(&tps6507x_ts_driver); +} +module_exit(tps6507x_ts_exit); + +MODULE_AUTHOR("Todd Fischer "); +MODULE_DESCRIPTION("TPS6507x - TouchScreen driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:tps6507x-tsc"); diff --git a/drivers/mfd/tps6507x.c b/drivers/mfd/tps6507x.c index c59f74570b3b..d859dffed39f 100644 --- a/drivers/mfd/tps6507x.c +++ b/drivers/mfd/tps6507x.c @@ -26,6 +26,9 @@ static struct mfd_cell tps6507x_devs[] = { { .name = "tps6507x-pmic", }, + { + .name = "tps6507x-ts", + }, }; diff --git a/include/linux/input/tps6507x-ts.h b/include/linux/input/tps6507x-ts.h new file mode 100644 index 000000000000..ab1440313924 --- /dev/null +++ b/include/linux/input/tps6507x-ts.h @@ -0,0 +1,24 @@ +/* linux/i2c/tps6507x-ts.h + * + * Functions to access TPS65070 touch screen chip. + * + * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com) + * + * + * For licencing details see kernel-base/COPYING + */ + +#ifndef __LINUX_I2C_TPS6507X_TS_H +#define __LINUX_I2C_TPS6507X_TS_H + +/* Board specific touch screen initial values */ +struct touchscreen_init_data { + int poll_period; /* ms */ + int vref; /* non-zero to leave vref on */ + __u16 min_pressure; /* min reading to be treated as a touch */ + __u16 vendor; + __u16 product; + __u16 version; +}; + +#endif /* __LINUX_I2C_TPS6507X_TS_H */ diff --git a/include/linux/mfd/tps6507x.h b/include/linux/mfd/tps6507x.h index 9543cb716428..c923e4864f55 100644 --- a/include/linux/mfd/tps6507x.h +++ b/include/linux/mfd/tps6507x.h @@ -142,6 +142,7 @@ struct tps6507x_board { struct regulator_init_data *tps6507x_pmic_init_data; + struct touchscreen_init_data *tps6507x_ts_init_data; }; /** @@ -162,6 +163,7 @@ struct tps6507x_dev { /* Client devices */ struct tps6507x_pmic *pmic; + struct tps6507x_ts *ts; }; #endif /* __LINUX_MFD_TPS6507X_H */ -- cgit v1.2.3