Hi Robert,
On Fri, Jul 10, 2015 at 06:11:04PM +0300, Robert Dolca wrote:
> This driver adds support for Silead touchscreens. It has been tested
> with GSL1680 and GSL3680 touch panels.
>
> It supports ACPI and device tree enumeration. For ACPI you need ACPI 5.1+
> in order to be able to use named GPIOs. In device tree you can use
> 'interrupts'
> or a named GPIO for IRQ.
>
> Screen resolution, the maximum number of fingers supported and firmware name
> are configurable using ACPI/DT properties.
>
> Signed-off-by: Robert Dolca <robert.do...@intel.com>
> ---
> drivers/input/touchscreen/Kconfig | 12 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/silead.c | 596
> +++++++++++++++++++++++++++++++++++++
> 3 files changed, 609 insertions(+)
> create mode 100644 drivers/input/touchscreen/silead.c
>
> diff --git a/drivers/input/touchscreen/Kconfig
> b/drivers/input/touchscreen/Kconfig
> index 547f67d65..dd12f36 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -1025,4 +1025,16 @@ config TOUCHSCREEN_ZFORCE
> To compile this driver as a module, choose M here: the
> module will be called zforce_ts.
>
> +config TOUCHSCREEN_SILEAD
> + tristate "Silead I2C touchscreen"
> + depends on I2C
> + help
> + Say Y here if you have the Silead touchscreen connected to
> + your system.
> +
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called silead.
> +
> endif
> diff --git a/drivers/input/touchscreen/Makefile
> b/drivers/input/touchscreen/Makefile
> index 44deea7..2c6beaa 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -84,3 +84,4 @@ obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
> obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o
> obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
> obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
> +obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
> diff --git a/drivers/input/touchscreen/silead.c
> b/drivers/input/touchscreen/silead.c
> new file mode 100644
> index 0000000..b7da344
> --- /dev/null
> +++ b/drivers/input/touchscreen/silead.c
> @@ -0,0 +1,596 @@
> +/* -------------------------------------------------------------------------
> + * 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/pm.h>
> +#include <linux/irq.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_X_OFF 0x02
> +#define SILEAD_POINT_ID_OFF 0x03
> +#define SILEAD_X_HSB_MASK 0xF0
> +#define SILEAD_TOUCH_ID_MASK 0x0F
> +
> +#define SILEAD_DP_X_MAX "resolution-x"
> +#define SILEAD_DP_Y_MAX "resolution-y"
> +#define SILEAD_DP_MAX_FINGERS "max-fingers"
> +#define SILEAD_DP_FW_NAME "fw-name"
> +#define SILEAD_PWR_GPIO_NAME "power"
> +
> +#define SILEAD_CMD_SLEEP_MIN 10000
> +#define SILEAD_CMD_SLEEP_MAX 20000
> +#define SILEAD_POWER_SLEEP 20
> +#define SILEAD_STARTUP_SLEEP 30
> +
> +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;
> + const char *custom_fw_name;
> + char fw_name[I2C_NAME_SIZE];
> + u16 x_max;
> + u16 y_max;
> + u8 max_fingers;
> + u32 chip_id;
> +};
> +
> +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 ret;
> +
> + data->input = devm_input_allocate_device(dev);
> + if (!data->input) {
> + dev_err(dev,
> + "Failed to allocate input device\n");
> + return -ENOMEM;
> + }
> +
> + input_set_capability(data->input, EV_ABS, ABS_X);
> + input_set_capability(data->input, EV_ABS, ABS_Y);
No need as you do input_set_abs_params() below.
> +
> + input_set_abs_params(data->input, ABS_MT_POSITION_X, 0,
> + data->x_max, 0, 0);
> + input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0,
> + data->y_max, 0, 0);
> +
> + input_mt_init_slots(data->input, data->max_fingers,
> + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
> +
> + data->input->name = SILEAD_TS_NAME;
> + data->input->phys = "input/ts";
> + data->input->id.bustype = BUS_I2C;
> +
> + ret = input_register_device(data->input);
> + if (ret) {
> + dev_err(dev, "Failed to register input device: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void silead_ts_report_touch(struct silead_ts_data *data, u16 x, u16 y,
> + u8 id)
> +{
> + input_mt_slot(data->input, id);
> + input_mt_report_slot_state(data->input, MT_TOOL_FINGER, true);
> + input_report_abs(data->input, ABS_MT_POSITION_X, x);
> + input_report_abs(data->input, ABS_MT_POSITION_Y, y);
> +}
> +
> +static void silead_ts_set_power(struct i2c_client *client,
> + enum silead_ts_power state)
> +{
> + struct silead_ts_data *data = i2c_get_clientdata(client);
> +
> + 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 device *dev = &client->dev;
> + u8 buf[SILEAD_TS_DATA_LEN];
> + int x, y, id, touch_nr, ret, i, offset;
> +
> + ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
> + SILEAD_TS_DATA_LEN, buf);
> + if (ret < 0) {
> + dev_err(dev, "Data read error %d\n", ret);
> + return;
> + }
> +
> + touch_nr = buf[0];
> +
> + if (touch_nr < 0)
> + return;
> +
> + dev_dbg(dev, "Touch number: %d\n", touch_nr);
> +
> + for (i = 1; i <= touch_nr; i++) {
> + offset = i * SILEAD_POINT_DATA_LEN;
> +
> + /* The last 4 bits are the touch id */
> + id = buf[offset + SILEAD_POINT_ID_OFF] & SILEAD_TOUCH_ID_MASK;
> +
> + /* The 1st 4 bits are part of X */
> + buf[offset + SILEAD_POINT_ID_OFF] =
> + (buf[offset + SILEAD_POINT_ID_OFF] & SILEAD_X_HSB_MASK)
> + >> 4;
> +
> + y = le16_to_cpup((__le16 *)(buf + offset));
> + x = le16_to_cpup((__le16 *)(buf + offset + SILEAD_POINT_X_OFF));
> +
> + dev_dbg(dev, "x=%d y=%d id=%d\n", x, y, id);
> + silead_ts_report_touch(data, x, y, id);
> + }
> +
> + input_mt_sync_frame(data->input);
> + input_sync(data->input);
> +}
> +
> +static int silead_ts_init(struct i2c_client *client)
> +{
> + struct silead_ts_data *data = i2c_get_clientdata(client);
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
> + SILEAD_CMD_RESET);
> + if (ret)
> + goto i2c_write_err;
> + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
> + data->max_fingers);
> + if (ret)
> + goto i2c_write_err;
> + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, SILEAD_CLOCK);
> + if (ret)
> + goto i2c_write_err;
> + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
> + SILEAD_CMD_START);
> + if (ret)
> + 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", ret);
> + return ret;
> +}
> +
> +static int silead_ts_reset(struct i2c_client *client)
> +{
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
> + SILEAD_CMD_RESET);
> + if (ret)
> + goto i2c_write_err;
> + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, SILEAD_CLOCK);
> + if (ret)
> + goto i2c_write_err;
> + usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
> + SILEAD_CMD_START);
> + if (ret)
> + 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", ret);
> + return ret;
> +}
> +
> +static int silead_ts_startup(struct i2c_client *client)
> +{
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
> + if (ret) {
> + dev_err(&client->dev, "Startup error %d\n", ret);
> + return ret;
> + }
> + 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 ret;
> +
> + dev_dbg(dev, "Firmware file name: %s", data->fw_name);
> +
> + if (data->custom_fw_name)
> + ret = request_firmware(&fw, data->custom_fw_name, dev);
> + else
> + ret = request_firmware(&fw, data->fw_name, dev);
> +
> + if (ret) {
> + dev_err(dev, "Firmware request error %d\n", ret);
> + return ret;
> + }
> +
> + fw_size = fw->size / sizeof(*fw_data);
> + fw_data = (struct silead_fw_data *)fw->data;
> +
> + for (i = 0; i < fw_size; i++) {
> + ret = i2c_smbus_write_i2c_block_data(client, fw_data[i].offset,
> + 4, (u8 *)&fw_data[i].val);
> + if (ret) {
> + dev_err(dev, "Firmware load error %d\n", ret);
> + goto release_fw_err;
> + }
> + }
> +
> + release_firmware(fw);
> + return 0;
> +
> +release_fw_err:
> + release_firmware(fw);
> + return ret;
> +}
> +
> +static u32 silead_ts_get_status(struct i2c_client *client)
> +{
> + int ret;
> + u32 status;
> +
> + ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS, 4,
> + (u8 *)&status);
Endianness.
> + if (ret < 0) {
> + dev_err(&client->dev, "Status read error %d\n", ret);
> + return ret;
> + }
> +
> + return status;
> +}
> +
> +static int silead_ts_get_id(struct i2c_client *client)
> +{
> + struct silead_ts_data *data = i2c_get_clientdata(client);
> + int ret;
> +
> + ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID, 4,
> + (u8 *)&data->chip_id);
Endianness.
> + if (ret < 0) {
> + dev_err(&client->dev, "Chip ID read error %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int silead_ts_setup(struct i2c_client *client)
> +{
> + struct silead_ts_data *data = i2c_get_clientdata(client);
> + struct device *dev = &client->dev;
> + int ret;
> + u32 status;
> +
> + silead_ts_set_power(client, SILEAD_POWER_OFF);
> + silead_ts_set_power(client, SILEAD_POWER_ON);
> +
> + ret = silead_ts_get_id(client);
> + if (ret)
> + return ret;
> + dev_dbg(dev, "Chip ID: 0x%8X", data->chip_id);
> +
> + ret = silead_ts_init(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_reset(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_load_fw(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_startup(client);
> + if (ret)
> + return ret;
> +
> + status = silead_ts_get_status(client);
> + if (status != SILEAD_STATUS_OK) {
> + dev_err(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 = (struct silead_ts_data *)id;
No need to cast from void *.
> + struct i2c_client *client = data->client;
> +
> + silead_ts_read_data(client);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int silead_ts_read_props(struct i2c_client *client)
> +{
> + struct silead_ts_data *data = i2c_get_clientdata(client);
> + struct device *dev = &client->dev;
> + int ret;
> +
> + ret = device_property_read_u16(dev, SILEAD_DP_X_MAX, &data->x_max);
> + if (ret) {
> + dev_err(dev, "Resolution X read error %d\n", ret);
> + goto error;
> + }
Can we use the standard touchscreen properties as described in
Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> +
> + ret = device_property_read_u16(dev, SILEAD_DP_Y_MAX, &data->y_max);
> + if (ret) {
> + dev_err(dev, "Resolution Y read error %d\n", ret);
> + goto error;
> + }
> +
> + ret = device_property_read_u8(dev, SILEAD_DP_MAX_FINGERS,
> + &data->max_fingers);
> + if (ret) {
> + dev_err(dev, "Max fingers read error %d\n", ret);
> + goto error;
> + }
Can you query the controller capabilities to get number of fingers
supported? What controls it? The chip? Firmware?
> +
> + ret = device_property_read_string(dev, SILEAD_DP_FW_NAME,
> + &data->custom_fw_name);
> + if (ret)
> + dev_info(dev, "Firmware file name read error. Using default.");
Why do we need this?
> +
> + dev_dbg(dev, "X max = %d, Y max = %d, max fingers = %d",
> + data->x_max, data->y_max, data->max_fingers);
> +
> + return 0;
> +
> +error:
> + return ret;
> +}
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id silead_ts_acpi_match[];
> +
> +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(silead_ts_acpi_match, dev);
> + if (!acpi_id)
> + return -ENODEV;
> +
> + sprintf(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 {
> + sprintf(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)
> +{
> + sprintf(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 ret;
> +
> + 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;
> +
> + ret = silead_ts_set_default_fw_name(data, id);
> + if (ret)
> + return ret;
> +
> + /* If the IRQ is not filled by DT or ACPI subsytem
> + * we can't continue without it */
> + if (client->irq <= 0)
> + return -ENODEV;
> +
> + /* Power GPIO pin */
> + data->gpio_power = devm_gpiod_get(dev, SILEAD_PWR_GPIO_NAME,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(data->gpio_power)) {
> + dev_err(dev, "Shutdown GPIO request failed\n");
> + return PTR_ERR(data->gpio_power);
> + }
> +
> + ret = silead_ts_read_props(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_setup(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_request_input_dev(data);
> + if (ret)
> + return ret;
> +
> + ret = devm_request_threaded_irq(dev, client->irq, NULL,
> + silead_ts_threaded_irq_handler,
> + IRQF_ONESHOT | IRQ_TYPE_EDGE_RISING,
> + client->name, data);
> + if (ret) {
> + dev_err(dev, "IRQ request failed %d\n", ret);
> + return ret;
> + }
> +
> + dev_dbg(dev, "Probing succeded\n");
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int silead_ts_suspend(struct device *dev)
Instead of guarding with ifdef let's annotate with __maybe_unused. This
provides better compile coverage.
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> +
> + silead_ts_set_power(client, SILEAD_POWER_OFF);
> + return 0;
> +}
> +
> +static int silead_ts_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + int ret, status;
Personal preference: can we call here and elsewhere variables that store
error codes only "error" and not "ret"?
> +
> + silead_ts_set_power(client, SILEAD_POWER_ON);
> +
> + ret = silead_ts_reset(client);
> + if (ret)
> + return ret;
> +
> + ret = silead_ts_startup(client);
> + if (ret)
> + return ret;
> +
> + status = silead_ts_get_status(client);
> + if (status != SILEAD_STATUS_OK) {
> + dev_err(dev, "Resume error, status: 0x%X\n", status);
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
Pull it out of ifdef and then you do not need #ifdef in driver
initializer.
> +#endif
> +
> +static const struct i2c_device_id silead_ts_id[] = {
> + { "gsl1680", 0 },
> + { "gsl1688", 0 },
> + { "gsl3670", 0 },
> + { "gsl3675", 0 },
> + { "gsl3692", 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 },
> + { }
> +};
> +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,
> + .owner = THIS_MODULE,
> +#ifdef CONFIG_ACPI
> + .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
> +#endif
No need for ifdef if you are using ACPI_PTR.
> +#ifdef CONFIG_PM_SLEEP
> + .pm = &silead_ts_pm,
> +#endif
> + },
> +};
> +module_i2c_driver(silead_ts_driver);
> +
> +MODULE_AUTHOR("Robert Dolca <robert.do...@intel.com>");
> +MODULE_DESCRIPTION("Silead I2C touchscreen driver");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
Thanks.
--
Dmitry
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