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SubjectRe: [PATCH 2/3] Input: st1232 - add support for st1633
Hi Martin,

On Mon, Jan 28, 2019 at 09:44:48AM +0100, Martin Kepplinger wrote:
> From: Martin Kepplinger <martin.kepplinger@ginzinger.com>
>
> Add support for the Sitronix ST1633 touchscreen controller to the st1232
> driver. A protocol spec can be found here:
> www.ampdisplay.com/documents/pdf/AM-320480B6TZQW-TC0H.pdf
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
> ---
> drivers/input/touchscreen/Kconfig | 6 +-
> drivers/input/touchscreen/st1232.c | 122 +++++++++++++++++++++--------
> 2 files changed, 94 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 068dbbc610fc..7c597a49c265 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -1168,11 +1168,11 @@ config TOUCHSCREEN_SIS_I2C
> module will be called sis_i2c.
>
> config TOUCHSCREEN_ST1232
> - tristate "Sitronix ST1232 touchscreen controllers"
> + tristate "Sitronix ST1232 or ST1633 touchscreen controllers"
> depends on I2C
> help
> - Say Y here if you want to support Sitronix ST1232
> - touchscreen controller.
> + Say Y here if you want to support the Sitronix ST1232
> + or ST1633 touchscreen controller.
>
> If unsure, say N.
>
> diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
> index 11ff32c68025..19a665d48dad 100644
> --- a/drivers/input/touchscreen/st1232.c
> +++ b/drivers/input/touchscreen/st1232.c
> @@ -23,13 +23,15 @@
> #include <linux/types.h>
>
> #define ST1232_TS_NAME "st1232-ts"
> +#define ST1633_TS_NAME "st1633-ts"
> +
> +enum {
> + st1232,
> + st1633,
> +};

This enum seems no longer needed, I dropped it.

>
> #define MIN_X 0x00
> #define MIN_Y 0x00

Given we no longer have constant MAX_X/Y I simply used 0 in
input_set_abs_params() and dropped MIN-X/Y.

> -#define MAX_X 0x31f /* (800 - 1) */
> -#define MAX_Y 0x1df /* (480 - 1) */
> -#define MAX_AREA 0xff
> -#define MAX_FINGERS 2
>
> struct st1232_ts_finger {
> u16 x;
> @@ -38,12 +40,24 @@ struct st1232_ts_finger {
> bool is_valid;
> };
>
> +struct st_chip_info {
> + bool have_z;
> + u16 max_x;
> + u16 max_y;
> + u16 max_area;
> + u16 max_fingers;
> + u8 start_reg;
> +};
> +
> struct st1232_ts_data {
> struct i2c_client *client;
> struct input_dev *input_dev;
> - struct st1232_ts_finger finger[MAX_FINGERS];
> struct dev_pm_qos_request low_latency_req;
> int reset_gpio;

Could you please create an additional patch converting this to gpiod?
Instead of doing of_get_gpio()/gpio_is_valid()/devm_gpio_request() smply
do

ts->reset_gpio = devm_gpiod_get_optional();
if (IS_ERR(ts->reset_gpio)) {
...
}

and later

if (ts->reset_gpio)
...

Looking at the code it looks like reset is as usual active low, so you
will need to invert the logic as gpiod takes care of convertion logical
value to proper level (active low or high).

> + const struct st_chip_info *chip_info;
> + int read_buf_len;
> + u8 *read_buf;
> + struct st1232_ts_finger *finger;
> };
>
> static int st1232_ts_read_data(struct st1232_ts_data *ts)
> @@ -52,40 +66,35 @@ static int st1232_ts_read_data(struct st1232_ts_data *ts)
> struct i2c_client *client = ts->client;
> struct i2c_msg msg[2];
> int error;
> - u8 start_reg;
> - u8 buf[10];
> + int i, y;
> + u8 start_reg = ts->chip_info->start_reg;
> + u8 *buf = ts->read_buf;
>
> - /* read touchscreen data from ST1232 */
> + /* read touchscreen data */
> msg[0].addr = client->addr;
> msg[0].flags = 0;
> msg[0].len = 1;
> msg[0].buf = &start_reg;
> - start_reg = 0x10;
>
> msg[1].addr = ts->client->addr;
> msg[1].flags = I2C_M_RD;
> - msg[1].len = sizeof(buf);
> + msg[1].len = ts->read_buf_len;
> msg[1].buf = buf;
>
> error = i2c_transfer(client->adapter, msg, 2);
> if (error < 0)
> return error;
>
> - /* get "valid" bits */
> - finger[0].is_valid = buf[2] >> 7;
> - finger[1].is_valid = buf[5] >> 7;
> + for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
> + finger[i].is_valid = buf[i + y] >> 7;
> + if (finger[i].is_valid) {
> + finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1];
> + finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2];
>
> - /* get xy coordinate */
> - if (finger[0].is_valid) {
> - finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
> - finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
> - finger[0].t = buf[8];
> - }
> -
> - if (finger[1].is_valid) {
> - finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
> - finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
> - finger[1].t = buf[9];
> + /* st1232 includes a z-axis / touch strength */
> + if (ts->chip_info->have_z)
> + finger[i].t = buf[i + 6];
> + }
> }
>
> return 0;
> @@ -104,11 +113,14 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
> goto end;
>
> /* multi touch protocol */
> - for (i = 0; i < MAX_FINGERS; i++) {
> + for (i = 0; i < ts->chip_info->max_fingers; i++) {
> if (!finger[i].is_valid)
> continue;
>
> - input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
> + if (ts->chip_info->have_z)
> + input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
> + finger[i].t);
> +
> input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
> input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
> input_mt_sync(input_dev);
> @@ -142,12 +154,40 @@ static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
> gpio_direction_output(ts->reset_gpio, poweron);
> }
>
> +static const struct st_chip_info st1232_chip_info = {
> + .have_z = true,
> + .max_x = 0x31f, /* 800 - 1 */
> + .max_y = 0x1df, /* 480 -1 */
> + .max_area = 0xff,
> + .max_fingers = 2,
> + .start_reg = 0x12,
> +};
> +
> +static const struct st_chip_info st1633_chip_info = {
> + .have_z = false,
> + .max_x = 0x13f, /* 320 - 1 */
> + .max_y = 0x1df, /* 480 -1 */
> + .max_area = 0x00,
> + .max_fingers = 5,
> + .start_reg = 0x12,
> +};
> +
> static int st1232_ts_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct st1232_ts_data *ts;
> + struct st1232_ts_finger *finger;
> struct input_dev *input_dev;
> int error;
> + const struct st_chip_info *match = NULL;

There is no need to initialize with NULL given that we do unconditional
assignment below. I removed initialization.

> +
> + match = device_get_match_data(&client->dev);
> + if (!match && id)
> + match = (const void *)id->driver_data;
> + if (!match) {
> + dev_err(&client->dev, "unknown device model\n");
> + return -ENODEV;
> + }
>
> if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> dev_err(&client->dev, "need I2C_FUNC_I2C\n");
> @@ -163,6 +203,19 @@ static int st1232_ts_probe(struct i2c_client *client,
> if (!ts)
> return -ENOMEM;
>
> + ts->chip_info = match;
> + ts->finger = devm_kzalloc(&client->dev,
> + sizeof(*finger) * ts->chip_info->max_fingers,
> + GFP_KERNEL);

I replaced it with devm_kcalloc(&client->dev,
ts->chip_info->max_fingers, sizeof(*finger),
GFP_KERNEL);

and applied.

> + if (!ts->finger)
> + return -ENOMEM;
> +
> + /* allocate a buffer according to the number of registers to read */
> + ts->read_buf_len = ts->chip_info->max_fingers * 4;
> + ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
> + if (!ts->read_buf)
> + return -ENOMEM;
> +
> input_dev = devm_input_allocate_device(&client->dev);
> if (!input_dev)
> return -ENOMEM;
> @@ -192,9 +245,14 @@ static int st1232_ts_probe(struct i2c_client *client,
> __set_bit(EV_KEY, input_dev->evbit);
> __set_bit(EV_ABS, input_dev->evbit);
>
> - input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
> - input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
> - input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
> + if (ts->chip_info->have_z)
> + input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
> + ts->chip_info->max_area, 0, 0);
> +
> + input_set_abs_params(input_dev, ABS_MT_POSITION_X,
> + MIN_X, ts->chip_info->max_x, 0, 0);
> + input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
> + MIN_Y, ts->chip_info->max_y, 0, 0);
>
> error = devm_request_threaded_irq(&client->dev, client->irq,
> NULL, st1232_ts_irq_handler,
> @@ -261,13 +319,15 @@ static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
> st1232_ts_suspend, st1232_ts_resume);
>
> static const struct i2c_device_id st1232_ts_id[] = {
> - { ST1232_TS_NAME, 0 },
> + { ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
> + { ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
>
> static const struct of_device_id st1232_ts_dt_ids[] = {
> - { .compatible = "sitronix,st1232", },
> + { .compatible = "sitronix,st1232", .data = &st1232_chip_info },
> + { .compatible = "sitronix,st1633", .data = &st1633_chip_info },
> { }
> };
> MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
> --
> 2.20.1
>

Thanks.

--
Dmitry

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