diff options
Diffstat (limited to 'drivers/input/touchscreen/mms114.c')
| -rw-r--r-- | drivers/input/touchscreen/mms114.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/mms114.c b/drivers/input/touchscreen/mms114.c new file mode 100644 index 000000000000..49c44bbf548d --- /dev/null +++ b/drivers/input/touchscreen/mms114.c @@ -0,0 +1,544 @@ +/* + * Copyright (C) 2012 Samsung Electronics Co.Ltd + * Author: Joonyoung Shim <jy0922.shim@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/i2c/mms114.h> +#include <linux/input/mt.h> +#include <linux/interrupt.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +/* Write only registers */ +#define MMS114_MODE_CONTROL 0x01 +#define MMS114_OPERATION_MODE_MASK 0xE +#define MMS114_ACTIVE (1 << 1) + +#define MMS114_XY_RESOLUTION_H 0x02 +#define MMS114_X_RESOLUTION 0x03 +#define MMS114_Y_RESOLUTION 0x04 +#define MMS114_CONTACT_THRESHOLD 0x05 +#define MMS114_MOVING_THRESHOLD 0x06 + +/* Read only registers */ +#define MMS114_PACKET_SIZE 0x0F +#define MMS114_INFOMATION 0x10 +#define MMS114_TSP_REV 0xF0 + +/* Minimum delay time is 50us between stop and start signal of i2c */ +#define MMS114_I2C_DELAY 50 + +/* 200ms needs after power on */ +#define MMS114_POWERON_DELAY 200 + +/* Touchscreen absolute values */ +#define MMS114_MAX_AREA 0xff + +#define MMS114_MAX_TOUCH 10 +#define MMS114_PACKET_NUM 8 + +/* Touch type */ +#define MMS114_TYPE_NONE 0 +#define MMS114_TYPE_TOUCHSCREEN 1 +#define MMS114_TYPE_TOUCHKEY 2 + +struct mms114_data { + struct i2c_client *client; + struct input_dev *input_dev; + struct regulator *core_reg; + struct regulator *io_reg; + const struct mms114_platform_data *pdata; + + /* Use cache data for mode control register(write only) */ + u8 cache_mode_control; +}; + +struct mms114_touch { + u8 id:4, reserved_bit4:1, type:2, pressed:1; + u8 x_hi:4, y_hi:4; + u8 x_lo; + u8 y_lo; + u8 width; + u8 strength; + u8 reserved[2]; +} __packed; + +static int __mms114_read_reg(struct mms114_data *data, unsigned int reg, + unsigned int len, u8 *val) +{ + struct i2c_client *client = data->client; + struct i2c_msg xfer[2]; + u8 buf = reg & 0xff; + int error; + + if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL) + BUG(); + + /* Write register: use repeated start */ + xfer[0].addr = client->addr; + xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART; + xfer[0].len = 1; + xfer[0].buf = &buf; + + /* Read data */ + xfer[1].addr = client->addr; + xfer[1].flags = I2C_M_RD; + xfer[1].len = len; + xfer[1].buf = val; + + error = i2c_transfer(client->adapter, xfer, 2); + if (error != 2) { + dev_err(&client->dev, + "%s: i2c transfer failed (%d)\n", __func__, error); + return error < 0 ? error : -EIO; + } + udelay(MMS114_I2C_DELAY); + + return 0; +} + +static int mms114_read_reg(struct mms114_data *data, unsigned int reg) +{ + u8 val; + int error; + + if (reg == MMS114_MODE_CONTROL) + return data->cache_mode_control; + + error = __mms114_read_reg(data, reg, 1, &val); + return error < 0 ? error : val; +} + +static int mms114_write_reg(struct mms114_data *data, unsigned int reg, + unsigned int val) +{ + struct i2c_client *client = data->client; + u8 buf[2]; + int error; + + buf[0] = reg & 0xff; + buf[1] = val & 0xff; + + error = i2c_master_send(client, buf, 2); + if (error != 2) { + dev_err(&client->dev, + "%s: i2c send failed (%d)\n", __func__, error); + return error < 0 ? error : -EIO; + } + udelay(MMS114_I2C_DELAY); + + if (reg == MMS114_MODE_CONTROL) + data->cache_mode_control = val; + + return 0; +} + +static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch) +{ + const struct mms114_platform_data *pdata = data->pdata; + struct i2c_client *client = data->client; + struct input_dev *input_dev = data->input_dev; + unsigned int id; + unsigned int x; + unsigned int y; + + if (touch->id > MMS114_MAX_TOUCH) { + dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id); + return; + } + + if (touch->type != MMS114_TYPE_TOUCHSCREEN) { + dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type); + return; + } + + id = touch->id - 1; + x = touch->x_lo | touch->x_hi << 8; + y = touch->y_lo | touch->y_hi << 8; + if (x > pdata->x_size || y > pdata->y_size) { + dev_dbg(&client->dev, + "Wrong touch coordinates (%d, %d)\n", x, y); + return; + } + + if (pdata->x_invert) + x = pdata->x_size - x; + if (pdata->y_invert) + y = pdata->y_size - y; + + dev_dbg(&client->dev, + "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n", + id, touch->type, touch->pressed, + x, y, touch->width, touch->strength); + + input_mt_slot(input_dev, id); + input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed); + + if (touch->pressed) { + input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width); + input_report_abs(input_dev, ABS_MT_POSITION_X, x); + input_report_abs(input_dev, ABS_MT_POSITION_Y, y); + input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength); + } +} + +static irqreturn_t mms114_interrupt(int irq, void *dev_id) +{ + struct mms114_data *data = dev_id; + struct input_dev *input_dev = data->input_dev; + struct mms114_touch touch[MMS114_MAX_TOUCH]; + int packet_size; + int touch_size; + int index; + int error; + + mutex_lock(&input_dev->mutex); + if (!input_dev->users) { + mutex_unlock(&input_dev->mutex); + goto out; + } + mutex_unlock(&input_dev->mutex); + + packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE); + if (packet_size <= 0) + goto out; + + touch_size = packet_size / MMS114_PACKET_NUM; + + error = __mms114_read_reg(data, MMS114_INFOMATION, packet_size, + (u8 *)touch); + if (error < 0) + goto out; + + for (index = 0; index < touch_size; index++) + mms114_process_mt(data, touch + index); + + input_mt_report_pointer_emulation(data->input_dev, true); + input_sync(data->input_dev); + +out: + return IRQ_HANDLED; +} + +static int mms114_set_active(struct mms114_data *data, bool active) +{ + int val; + + val = mms114_read_reg(data, MMS114_MODE_CONTROL); + if (val < 0) + return val; + + val &= ~MMS114_OPERATION_MODE_MASK; + + /* If active is false, sleep mode */ + if (active) + val |= MMS114_ACTIVE; + + return mms114_write_reg(data, MMS114_MODE_CONTROL, val); +} + +static int mms114_get_version(struct mms114_data *data) +{ + struct device *dev = &data->client->dev; + u8 buf[6]; + int error; + + error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf); + if (error < 0) + return error; + + dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n", + buf[0], buf[1], buf[3]); + + return 0; +} + +static int mms114_setup_regs(struct mms114_data *data) +{ + const struct mms114_platform_data *pdata = data->pdata; + int val; + int error; + + error = mms114_get_version(data); + if (error < 0) + return error; + + error = mms114_set_active(data, true); + if (error < 0) + return error; + + val = (pdata->x_size >> 8) & 0xf; + val |= ((pdata->y_size >> 8) & 0xf) << 4; + error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val); + if (error < 0) + return error; + + val = pdata->x_size & 0xff; + error = mms114_write_reg(data, MMS114_X_RESOLUTION, val); + if (error < 0) + return error; + + val = pdata->y_size & 0xff; + error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val); + if (error < 0) + return error; + + if (pdata->contact_threshold) { + error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD, + pdata->contact_threshold); + if (error < 0) + return error; + } + + if (pdata->moving_threshold) { + error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD, + pdata->moving_threshold); + if (error < 0) + return error; + } + + return 0; +} + +static int mms114_start(struct mms114_data *data) +{ + struct i2c_client *client = data->client; + int error; + + if (data->core_reg) + regulator_enable(data->core_reg); + if (data->io_reg) + regulator_enable(data->io_reg); + mdelay(MMS114_POWERON_DELAY); + + error = mms114_setup_regs(data); + if (error < 0) + return error; + + if (data->pdata->cfg_pin) + data->pdata->cfg_pin(true); + + enable_irq(client->irq); + + return 0; +} + +static void mms114_stop(struct mms114_data *data) +{ + struct i2c_client *client = data->client; + + disable_irq(client->irq); + + if (data->pdata->cfg_pin) + data->pdata->cfg_pin(false); + + if (data->io_reg) + regulator_disable(data->io_reg); + if (data->core_reg) + regulator_disable(data->core_reg); +} + +static int mms114_input_open(struct input_dev *dev) +{ + struct mms114_data *data = input_get_drvdata(dev); + + return mms114_start(data); +} + +static void mms114_input_close(struct input_dev *dev) +{ + struct mms114_data *data = input_get_drvdata(dev); + + mms114_stop(data); +} + +static int __devinit mms114_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct mms114_data *data; + struct input_dev *input_dev; + int error; + + if (!client->dev.platform_data) { + dev_err(&client->dev, "Need platform data\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_PROTOCOL_MANGLING)) { + dev_err(&client->dev, + "Need i2c bus that supports protocol mangling\n"); + return -ENODEV; + } + + data = kzalloc(sizeof(struct mms114_data), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!data || !input_dev) { + dev_err(&client->dev, "Failed to allocate memory\n"); + error = -ENOMEM; + goto err_free_mem; + } + + data->client = client; + data->input_dev = input_dev; + data->pdata = client->dev.platform_data; + + input_dev->name = "MELPAS MMS114 Touchscreen"; + input_dev->id.bustype = BUS_I2C; + input_dev->dev.parent = &client->dev; + input_dev->open = mms114_input_open; + input_dev->close = mms114_input_close; + + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(EV_KEY, input_dev->evbit); + __set_bit(BTN_TOUCH, input_dev->keybit); + input_set_abs_params(input_dev, ABS_X, 0, data->pdata->x_size, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, data->pdata->y_size, 0, 0); + + /* For multi touch */ + input_mt_init_slots(input_dev, MMS114_MAX_TOUCH); + input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, + 0, MMS114_MAX_AREA, 0, 0); + input_set_abs_params(input_dev, ABS_MT_POSITION_X, + 0, data->pdata->x_size, 0, 0); + input_set_abs_params(input_dev, ABS_MT_POSITION_Y, + 0, data->pdata->y_size, 0, 0); + input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0); + + input_set_drvdata(input_dev, data); + i2c_set_clientdata(client, data); + + data->core_reg = regulator_get(&client->dev, "avdd"); + if (IS_ERR(data->core_reg)) { + error = PTR_ERR(data->core_reg); + dev_err(&client->dev, + "Unable to get the Core regulator (%d)\n", error); + goto err_free_mem; + } + + data->io_reg = regulator_get(&client->dev, "vdd"); + if (IS_ERR(data->io_reg)) { + error = PTR_ERR(data->io_reg); + dev_err(&client->dev, + "Unable to get the IO regulator (%d)\n", error); + goto err_core_reg; + } + + error = request_threaded_irq(client->irq, NULL, mms114_interrupt, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "mms114", data); + if (error) { + dev_err(&client->dev, "Failed to register interrupt\n"); + goto err_io_reg; + } + disable_irq(client->irq); + + error = input_register_device(data->input_dev); + if (error) + goto err_free_irq; + + return 0; + +err_free_irq: + free_irq(client->irq, data); +err_io_reg: + regulator_put(data->io_reg); +err_core_reg: + regulator_put(data->core_reg); +err_free_mem: + input_free_device(input_dev); + kfree(data); + return error; +} + +static int __devexit mms114_remove(struct i2c_client *client) +{ + struct mms114_data *data = i2c_get_clientdata(client); + + free_irq(client->irq, data); + regulator_put(data->io_reg); + regulator_put(data->core_reg); + input_unregister_device(data->input_dev); + kfree(data); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mms114_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct mms114_data *data = i2c_get_clientdata(client); + struct input_dev *input_dev = data->input_dev; + int id; + + /* Release all touch */ + for (id = 0; id < MMS114_MAX_TOUCH; id++) { + input_mt_slot(input_dev, id); + input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false); + } + + input_mt_report_pointer_emulation(input_dev, true); + input_sync(input_dev); + + mutex_lock(&input_dev->mutex); + if (input_dev->users) + mms114_stop(data); + mutex_unlock(&input_dev->mutex); + + return 0; +} + +static int mms114_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct mms114_data *data = i2c_get_clientdata(client); + struct input_dev *input_dev = data->input_dev; + int error; + + mutex_lock(&input_dev->mutex); + if (input_dev->users) { + error = mms114_start(data); + if (error < 0) { + mutex_unlock(&input_dev->mutex); + return error; + } + } + mutex_unlock(&input_dev->mutex); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume); + +static const struct i2c_device_id mms114_id[] = { + { "mms114", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mms114_id); + +static struct i2c_driver mms114_driver = { + .driver = { + .name = "mms114", + .owner = THIS_MODULE, + .pm = &mms114_pm_ops, + }, + .probe = mms114_probe, + .remove = __devexit_p(mms114_remove), + .id_table = mms114_id, +}; + +module_i2c_driver(mms114_driver); + +/* Module information */ +MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); +MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver"); +MODULE_LICENSE("GPL"); |