Re: [PATCH 2/2] Input: st1232 - add support for st1633

From: Dmitry Torokhov
Date: Thu Jan 24 2019 - 03:48:21 EST

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Hi Martin,

On Wed, Jan 23, 2019 at 08:26:51AM +0100, Martin Kepplinger wrote:
> From: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx>
>
> Add support for the Sitronix ST1633 touchscreen controller to the st1232
> driver.
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx>
> ---
> drivers/input/touchscreen/Kconfig | 6 +-
> drivers/input/touchscreen/st1232.c | 130 +++++++++++++++++++++--------
> 2 files changed, 98 insertions(+), 38 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..dc0288f37fda 100644
> --- a/drivers/input/touchscreen/st1232.c
> +++ b/drivers/input/touchscreen/st1232.c
> @@ -18,18 +18,21 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_gpio.h>
> +#include <linux/of_device.h>
> #include <linux/pm_qos.h>
> #include <linux/slab.h>
> #include <linux/types.h>
>
> #define ST1232_TS_NAME "st1232-ts"
> +#define ST1633_TS_NAME "st1633-ts"
> +
> +enum {
> + st1232,
> + st1633,
> +};
>
> #define MIN_X 0x00
> #define MIN_Y 0x00
> -#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 +41,24 @@ struct st1232_ts_finger {
> bool is_valid;
> };
>
> +struct st_chip_info {
> + u8 id;

It should be the enum, not u8, but I do not think you need id here at
all. You only check id when you decide whether to report
ABS_MT_TOUCH_MAJOR, I think having a boolean to indicate that fact would
be more in line with the spirit of this patch.

> + 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;
> + 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 +67,35 @@ 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->id == st1232)
> + finger[i].t = buf[i + 6];
> + }
> }
>
> return 0;
> @@ -104,11 +114,14 @@ 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->id == st1232)
> + 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 +155,46 @@ 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 st_chip_info_table[] = {

Instead of array just define 2 separate structures.

> + [st1232] = {
> + .id = st1232,
> + .max_x = 0x31f, /* 800 - 1 */
> + .max_y = 0x1df, /* 480 -1 */
> + .max_area = 0xff,
> + .max_fingers = 2,
> + .start_reg = 0x12,
> + },
> + [st1633] = {
> + .id = st1633,
> + .max_x = 0x13f, /* 320 - 1 */
> + .max_y = 0x1df, /* 480 -1 */
> + .max_area = 0x00,
> + .max_fingers = 5,
> + .start_reg = 0x12,
> + },
> +};
> +
> +static const struct of_device_id st1232_ts_dt_ids[] = {
> + { .compatible = "sitronix,st1232", .data = &st_chip_info_table[st1232] },
> + { .compatible = "sitronix,st1633", .data = &st_chip_info_table[st1633] },
> + { }
> +};

No need to move the table here, you can use device_get_match_data() that
does not require supplying table. This will also transparently handle
non-OF case (but you need to add data to i2c ids as well).

> +MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
> +
> 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 of_device_id *match;
> +
> + match = of_match_device(st1232_ts_dt_ids, &client->dev);
> + 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 +210,19 @@ static int st1232_ts_probe(struct i2c_client *client,
> if (!ts)
> return -ENOMEM;
>
> + ts->chip_info = match->data;
> + ts->finger = devm_kzalloc(&client->dev,
> + sizeof(*finger) * ts->chip_info->max_fingers,
> + GFP_KERNEL);
> + 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 +252,14 @@ 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->id == st1232)
> + 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,
> @@ -262,16 +327,11 @@ static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
>
> static const struct i2c_device_id st1232_ts_id[] = {
> { ST1232_TS_NAME, 0 },
> + { ST1633_TS_NAME, 0 },
> { }
> };
> MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
>
> -static const struct of_device_id st1232_ts_dt_ids[] = {
> - { .compatible = "sitronix,st1232", },
> - { }
> -};
> -MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
> -
> static struct i2c_driver st1232_ts_driver = {
> .probe = st1232_ts_probe,
> .remove = st1232_ts_remove,
> --
> 2.20.1
>

Thanks.

--
Dmitry

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Next in thread: Dmitry Torokhov: "Re: [PATCH 2/2] Input: st1232 - add support for st1633"
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