| /* ------------------------------------------------------------------------- |
| * 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 = devm_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"); |