diff options
Diffstat (limited to 'drivers/input/touchscreen/silead.c')
| -rw-r--r-- | drivers/input/touchscreen/silead.c | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c new file mode 100644 index 000000000000..7379fe153cf9 --- /dev/null +++ b/drivers/input/touchscreen/silead.c @@ -0,0 +1,565 @@ +/* ------------------------------------------------------------------------- + * Copyright (C) 2014-2015, Intel Corporation + * + * Derived from: + * gslX68X.c + * Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * ------------------------------------------------------------------------- + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/acpi.h> +#include <linux/interrupt.h> +#include <linux/gpio/consumer.h> +#include <linux/delay.h> +#include <linux/firmware.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input/touchscreen.h> +#include <linux/pm.h> +#include <linux/irq.h> + +#include <asm/unaligned.h> + +#define SILEAD_TS_NAME "silead_ts" + +#define SILEAD_REG_RESET 0xE0 +#define SILEAD_REG_DATA 0x80 +#define SILEAD_REG_TOUCH_NR 0x80 +#define SILEAD_REG_POWER 0xBC +#define SILEAD_REG_CLOCK 0xE4 +#define SILEAD_REG_STATUS 0xB0 +#define SILEAD_REG_ID 0xFC +#define SILEAD_REG_MEM_CHECK 0xB0 + +#define SILEAD_STATUS_OK 0x5A5A5A5A +#define SILEAD_TS_DATA_LEN 44 +#define SILEAD_CLOCK 0x04 + +#define SILEAD_CMD_RESET 0x88 +#define SILEAD_CMD_START 0x00 + +#define SILEAD_POINT_DATA_LEN 0x04 +#define SILEAD_POINT_Y_OFF 0x00 +#define SILEAD_POINT_Y_MSB_OFF 0x01 +#define SILEAD_POINT_X_OFF 0x02 +#define SILEAD_POINT_X_MSB_OFF 0x03 +#define SILEAD_TOUCH_ID_MASK 0xF0 + +#define SILEAD_CMD_SLEEP_MIN 10000 +#define SILEAD_CMD_SLEEP_MAX 20000 +#define SILEAD_POWER_SLEEP 20 +#define SILEAD_STARTUP_SLEEP 30 + +#define SILEAD_MAX_FINGERS 10 + +enum silead_ts_power { + SILEAD_POWER_ON = 1, + SILEAD_POWER_OFF = 0 +}; + +struct silead_ts_data { + struct i2c_client *client; + struct gpio_desc *gpio_power; + struct input_dev *input; + char fw_name[64]; + struct touchscreen_properties prop; + u32 max_fingers; + u32 chip_id; + struct input_mt_pos pos[SILEAD_MAX_FINGERS]; + int slots[SILEAD_MAX_FINGERS]; + int id[SILEAD_MAX_FINGERS]; +}; + +struct silead_fw_data { + u32 offset; + u32 val; +}; + +static int silead_ts_request_input_dev(struct silead_ts_data *data) +{ + struct device *dev = &data->client->dev; + int error; + + data->input = devm_input_allocate_device(dev); + if (!data->input) { + dev_err(dev, + "Failed to allocate input device\n"); + return -ENOMEM; + } + + input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0); + input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0); + touchscreen_parse_properties(data->input, true, &data->prop); + + input_mt_init_slots(data->input, data->max_fingers, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED | + INPUT_MT_TRACK); + + data->input->name = SILEAD_TS_NAME; + data->input->phys = "input/ts"; + data->input->id.bustype = BUS_I2C; + + error = input_register_device(data->input); + if (error) { + dev_err(dev, "Failed to register input device: %d\n", error); + return error; + } + + return 0; +} + +static void silead_ts_set_power(struct i2c_client *client, + enum silead_ts_power state) +{ + struct silead_ts_data *data = i2c_get_clientdata(client); + + if (data->gpio_power) { + gpiod_set_value_cansleep(data->gpio_power, state); + msleep(SILEAD_POWER_SLEEP); + } +} + +static void silead_ts_read_data(struct i2c_client *client) +{ + struct silead_ts_data *data = i2c_get_clientdata(client); + struct input_dev *input = data->input; + struct device *dev = &client->dev; + u8 *bufp, buf[SILEAD_TS_DATA_LEN]; + int touch_nr, error, i; + + error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA, + SILEAD_TS_DATA_LEN, buf); + if (error < 0) { + dev_err(dev, "Data read error %d\n", error); + return; + } + + touch_nr = buf[0]; + if (touch_nr > data->max_fingers) { + dev_warn(dev, "More touches reported then supported %d > %d\n", + touch_nr, data->max_fingers); + touch_nr = data->max_fingers; + } + + bufp = buf + SILEAD_POINT_DATA_LEN; + for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) { + /* Bits 4-7 are the touch id */ + data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] & + SILEAD_TOUCH_ID_MASK) >> 4; + touchscreen_set_mt_pos(&data->pos[i], &data->prop, + get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff, + get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff); + } + + input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0); + + for (i = 0; i < touch_nr; i++) { + input_mt_slot(input, data->slots[i]); + input_mt_report_slot_state(input, MT_TOOL_FINGER, true); + input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x); + input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y); + + dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x, + data->pos[i].y, data->id[i], data->slots[i]); + } + + input_mt_sync_frame(input); + input_sync(input); +} + +static int silead_ts_init(struct i2c_client *client) +{ + struct silead_ts_data *data = i2c_get_clientdata(client); + int error; + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, + SILEAD_CMD_RESET); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR, + data->max_fingers); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, + SILEAD_CLOCK); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, + SILEAD_CMD_START); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + return 0; + +i2c_write_err: + dev_err(&client->dev, "Registers clear error %d\n", error); + return error; +} + +static int silead_ts_reset(struct i2c_client *client) +{ + int error; + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, + SILEAD_CMD_RESET); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, + SILEAD_CLOCK); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER, + SILEAD_CMD_START); + if (error) + goto i2c_write_err; + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); + + return 0; + +i2c_write_err: + dev_err(&client->dev, "Chip reset error %d\n", error); + return error; +} + +static int silead_ts_startup(struct i2c_client *client) +{ + int error; + + error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00); + if (error) { + dev_err(&client->dev, "Startup error %d\n", error); + return error; + } + + msleep(SILEAD_STARTUP_SLEEP); + + return 0; +} + +static int silead_ts_load_fw(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct silead_ts_data *data = i2c_get_clientdata(client); + unsigned int fw_size, i; + const struct firmware *fw; + struct silead_fw_data *fw_data; + int error; + + dev_dbg(dev, "Firmware file name: %s", data->fw_name); + + error = request_firmware(&fw, data->fw_name, dev); + if (error) { + dev_err(dev, "Firmware request error %d\n", error); + return error; + } + + fw_size = fw->size / sizeof(*fw_data); + fw_data = (struct silead_fw_data *)fw->data; + + for (i = 0; i < fw_size; i++) { + error = i2c_smbus_write_i2c_block_data(client, + fw_data[i].offset, + 4, + (u8 *)&fw_data[i].val); + if (error) { + dev_err(dev, "Firmware load error %d\n", error); + break; + } + } + + release_firmware(fw); + return error ?: 0; +} + +static u32 silead_ts_get_status(struct i2c_client *client) +{ + int error; + __le32 status; + + error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS, + sizeof(status), (u8 *)&status); + if (error < 0) { + dev_err(&client->dev, "Status read error %d\n", error); + return error; + } + + return le32_to_cpu(status); +} + +static int silead_ts_get_id(struct i2c_client *client) +{ + struct silead_ts_data *data = i2c_get_clientdata(client); + __le32 chip_id; + int error; + + error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID, + sizeof(chip_id), (u8 *)&chip_id); + if (error < 0) { + dev_err(&client->dev, "Chip ID read error %d\n", error); + return error; + } + + data->chip_id = le32_to_cpu(chip_id); + dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id); + + return 0; +} + +static int silead_ts_setup(struct i2c_client *client) +{ + int error; + u32 status; + + silead_ts_set_power(client, SILEAD_POWER_OFF); + silead_ts_set_power(client, SILEAD_POWER_ON); + + error = silead_ts_get_id(client); + if (error) + return error; + + error = silead_ts_init(client); + if (error) + return error; + + error = silead_ts_reset(client); + if (error) + return error; + + error = silead_ts_load_fw(client); + if (error) + return error; + + error = silead_ts_startup(client); + if (error) + return error; + + status = silead_ts_get_status(client); + if (status != SILEAD_STATUS_OK) { + dev_err(&client->dev, + "Initialization error, status: 0x%X\n", status); + return -ENODEV; + } + + return 0; +} + +static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id) +{ + struct silead_ts_data *data = id; + struct i2c_client *client = data->client; + + silead_ts_read_data(client); + + return IRQ_HANDLED; +} + +static void silead_ts_read_props(struct i2c_client *client) +{ + struct silead_ts_data *data = i2c_get_clientdata(client); + struct device *dev = &client->dev; + const char *str; + int error; + + error = device_property_read_u32(dev, "silead,max-fingers", + &data->max_fingers); + if (error) { + dev_dbg(dev, "Max fingers read error %d\n", error); + data->max_fingers = 5; /* Most devices handle up-to 5 fingers */ + } + + error = device_property_read_string(dev, "touchscreen-fw-name", &str); + if (!error) + snprintf(data->fw_name, sizeof(data->fw_name), "%s", str); + else + dev_dbg(dev, "Firmware file name read error. Using default."); +} + +#ifdef CONFIG_ACPI +static int silead_ts_set_default_fw_name(struct silead_ts_data *data, + const struct i2c_device_id *id) +{ + const struct acpi_device_id *acpi_id; + struct device *dev = &data->client->dev; + int i; + + if (ACPI_HANDLE(dev)) { + acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); + if (!acpi_id) + return -ENODEV; + + snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", + acpi_id->id); + + for (i = 0; i < strlen(data->fw_name); i++) + data->fw_name[i] = tolower(data->fw_name[i]); + } else { + snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", + id->name); + } + + return 0; +} +#else +static int silead_ts_set_default_fw_name(struct silead_ts_data *data, + const struct i2c_device_id *id) +{ + snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", id->name); + return 0; +} +#endif + +static int silead_ts_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct silead_ts_data *data; + struct device *dev = &client->dev; + int error; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_I2C | + I2C_FUNC_SMBUS_READ_I2C_BLOCK | + I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { + dev_err(dev, "I2C functionality check failed\n"); + return -ENXIO; + } + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + data->client = client; + + error = silead_ts_set_default_fw_name(data, id); + if (error) + return error; + + silead_ts_read_props(client); + + /* We must have the IRQ provided by DT or ACPI subsytem */ + if (client->irq <= 0) + return -ENODEV; + + /* Power GPIO pin */ + data->gpio_power = gpiod_get_optional(dev, "power", GPIOD_OUT_LOW); + if (IS_ERR(data->gpio_power)) { + if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER) + dev_err(dev, "Shutdown GPIO request failed\n"); + return PTR_ERR(data->gpio_power); + } + + error = silead_ts_setup(client); + if (error) + return error; + + error = silead_ts_request_input_dev(data); + if (error) + return error; + + error = devm_request_threaded_irq(dev, client->irq, + NULL, silead_ts_threaded_irq_handler, + IRQF_ONESHOT, client->name, data); + if (error) { + if (error != -EPROBE_DEFER) + dev_err(dev, "IRQ request failed %d\n", error); + return error; + } + + return 0; +} + +static int __maybe_unused silead_ts_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + + silead_ts_set_power(client, SILEAD_POWER_OFF); + return 0; +} + +static int __maybe_unused silead_ts_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + int error, status; + + silead_ts_set_power(client, SILEAD_POWER_ON); + + error = silead_ts_reset(client); + if (error) + return error; + + error = silead_ts_startup(client); + if (error) + return error; + + status = silead_ts_get_status(client); + if (status != SILEAD_STATUS_OK) { + dev_err(dev, "Resume error, status: 0x%02x\n", status); + return -ENODEV; + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume); + +static const struct i2c_device_id silead_ts_id[] = { + { "gsl1680", 0 }, + { "gsl1688", 0 }, + { "gsl3670", 0 }, + { "gsl3675", 0 }, + { "gsl3692", 0 }, + { "mssl1680", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, silead_ts_id); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id silead_ts_acpi_match[] = { + { "GSL1680", 0 }, + { "GSL1688", 0 }, + { "GSL3670", 0 }, + { "GSL3675", 0 }, + { "GSL3692", 0 }, + { "MSSL1680", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match); +#endif + +static struct i2c_driver silead_ts_driver = { + .probe = silead_ts_probe, + .id_table = silead_ts_id, + .driver = { + .name = SILEAD_TS_NAME, + .acpi_match_table = ACPI_PTR(silead_ts_acpi_match), + .pm = &silead_ts_pm, + }, +}; +module_i2c_driver(silead_ts_driver); + +MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>"); +MODULE_DESCRIPTION("Silead I2C touchscreen driver"); +MODULE_LICENSE("GPL"); |