On Thu, 2020-03-12 at 17:50 +0300, Dmitry Mastykin wrote:
> Some devices with a goodix touchscreen have more then 1 capacitive
> touch-key. This commit replaces the current support for a single
> touch-key, which ignored the reported key-code. With support for
> up to 7 touch-keys, based upon checking the key-code which is
> post-fixed to any reported touch-data.
>
> KEY_LEFTMETA is assigned to the first touch-key (it will still be
> the default keycode for devices with a single touch-key).
> KEY_F1, KEY_F2... are assigned as default keycode for the other
> touch-keys.
>
> This commit also add supports for keycode remapping, so that
> systemd-udev's hwdb can be used to remap the codes to send
> keycodes to match the icons on the buttons for devices with more
> then 1 touch-key.
>
> Signed-off-by: Dmitry Mastykin <dmastykin@xxxxxxxxxxxxx>
> ---
> Changes in v2:
> - Improve commit message
> ---
> drivers/input/touchscreen/goodix.c | 54 ++++++++++++++++++++++++--
> ----
> 1 file changed, 44 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/input/touchscreen/goodix.c
> b/drivers/input/touchscreen/goodix.c
> index adb9b92..daf1781 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -38,6 +38,7 @@
> #define GOODIX_CONTACT_SIZE 8
> #define GOODIX_MAX_CONTACT_SIZE 9
> #define GOODIX_MAX_CONTACTS 10
> +#define GOODIX_MAX_KEYS 7
>
> #define GOODIX_CONFIG_MIN_LENGTH 186
> #define GOODIX_CONFIG_911_LENGTH 186
> @@ -55,6 +56,7 @@
> #define GOODIX_REG_ID 0x8140
>
> #define GOODIX_BUFFER_STATUS_READY BIT(7)
> +#define GOODIX_HAVE_KEY BIT(4)
> #define GOODIX_BUFFER_STATUS_TIMEOUT 20
>
> #define RESOLUTION_LOC 1
> @@ -100,6 +102,7 @@ struct goodix_ts_data {
> enum goodix_irq_pin_access_method irq_pin_access_method;
> unsigned int contact_size;
> u8 config[GOODIX_CONFIG_MAX_LENGTH];
> + unsigned short keymap[GOODIX_MAX_KEYS];
> };
>
> static int goodix_check_cfg_8(struct goodix_ts_data *ts,
> @@ -285,8 +288,14 @@ static int goodix_ts_read_input_report(struct
> goodix_ts_data *ts, u8 *data)
> */
> max_timeout = jiffies +
> msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
> do {
> + /*
> + * We are going to read ts->contact_size * max(1,
> touch_num) + 2
> + * bytes, where + 2 consists of reading 1 extra byte
> for the
> + * header + 1 extra byte for the footer which contains
> the
> + * touch-key code.
Can't say that I like the magic "2" used here and in a number of other
places in this patch. Is it always the same 2? If so, could we use a
constant instead? (GOODIX_TOUCH_KEYS_HEADER_FOOTER_SIZE?)
Looks good otherwise.
> + */
> error = goodix_i2c_read(ts->client,
> GOODIX_READ_COOR_ADDR,
> - data, ts->contact_size + 1);
> + data, ts->contact_size + 2);
> if (error) {
> dev_err(&ts->client->dev, "I2C transfer error:
> %d\n",
> error);
> @@ -299,10 +308,10 @@ static int goodix_ts_read_input_report(struct
> goodix_ts_data *ts, u8 *data)
> return -EPROTO;
>
> if (touch_num > 1) {
> - data += 1 + ts->contact_size;
> + data += 2 + ts->contact_size;
> error = goodix_i2c_read(ts->client,
> GOODIX_READ_COOR_ADDR +
> - 1 + ts-
> >contact_size,
> + 2 + ts-
> >contact_size,
> data,
> ts->contact_size *
> (touch_num -
> 1));
> @@ -353,6 +362,23 @@ static void goodix_ts_report_touch_9b(struct
> goodix_ts_data *ts, u8 *coor_data)
> input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
> }
>
> +static void goodix_ts_report_key(struct goodix_ts_data *ts, u8
> *data)
> +{
> + int touch_num;
> + u8 key_value;
> + int i;
> +
> + if (data[0] & GOODIX_HAVE_KEY) {
> + touch_num = data[0] & 0x0f;
> + key_value = data[1 + ts->contact_size * touch_num];
> + for (i = 0; i < GOODIX_MAX_KEYS; ++i)
> + if (key_value & (1 << i))
> + input_report_key(ts->input_dev, ts-
> >keymap[i], 1);
> + } else
> + for (i = 0; i < GOODIX_MAX_KEYS; ++i)
> + input_report_key(ts->input_dev, ts->keymap[i],
> 0);
> +}
> +
> /**
> * goodix_process_events - Process incoming events
> *
> @@ -363,7 +389,7 @@ static void goodix_ts_report_touch_9b(struct
> goodix_ts_data *ts, u8 *coor_data)
> */
> static void goodix_process_events(struct goodix_ts_data *ts)
> {
> - u8 point_data[1 + GOODIX_MAX_CONTACT_SIZE *
> GOODIX_MAX_CONTACTS];
> + u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE *
> GOODIX_MAX_CONTACTS];
> int touch_num;
> int i;
>
> @@ -371,11 +397,7 @@ static void goodix_process_events(struct
> goodix_ts_data *ts)
> if (touch_num < 0)
> return;
>
> - /*
> - * Bit 4 of the first byte reports the status of the capacitive
> - * Windows/Home button.
> - */
> - input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] &
> BIT(4));
> + goodix_ts_report_key(ts, point_data);
>
> for (i = 0; i < touch_num; i++)
> if (ts->contact_size == 9)
> @@ -961,6 +983,7 @@ static int goodix_i2c_test(struct i2c_client
> *client)
> static int goodix_configure_dev(struct goodix_ts_data *ts)
> {
> int error;
> + int i;
>
> ts->int_trigger_type = GOODIX_INT_TRIGGER;
> ts->max_touch_num = GOODIX_MAX_CONTACTS;
> @@ -978,8 +1001,19 @@ static int goodix_configure_dev(struct
> goodix_ts_data *ts)
> ts->input_dev->id.product = ts->id;
> ts->input_dev->id.version = ts->version;
>
> + ts->input_dev->keycode = ts->keymap;
> + ts->input_dev->keycodesize = sizeof(ts->keymap[0]);
> + ts->input_dev->keycodemax = GOODIX_MAX_KEYS;
> +
> /* Capacitive Windows/Home button on some devices */
> - input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
> + for (i = 0; i < GOODIX_MAX_KEYS; ++i) {
> + if (i == 0)
> + ts->keymap[i] = KEY_LEFTMETA;
> + else
> + ts->keymap[i] = KEY_F1 + (i - 1);
> +
> + input_set_capability(ts->input_dev, EV_KEY, ts-
> >keymap[i]);
> + }
>
> input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
> input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
