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Date: Mon, 28 Jan 2019 20:10:00 +0100
From: Martin Kepplinger <martink@...teo.de>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: devicetree@...r.kernel.org, linux-input@...r.kernel.org,
robh+dt@...nel.org, mark.rutland@....com,
linux-kernel@...r.kernel.org,
Martin Kepplinger <martin.kepplinger@...zinger.com>
Subject: Re: [PATCH 2/3] Input: st1232 - add support for st1633
Am 28.01.2019 20:03 schrieb Dmitry Torokhov:
> Hi Martin,
>
> On Mon, Jan 28, 2019 at 09:44:48AM +0100, Martin Kepplinger wrote:
>> From: Martin Kepplinger <martin.kepplinger@...zinger.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@...zinger.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).
I'll test your applied changes and get back to this tomorrow.
thanks.
>
>> + 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.
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