diff options
author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-10-22 10:31:16 -0700 |
---|---|---|
committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-10-28 21:04:27 -0700 |
commit | a1b92973fba47ceaeb0e337132876aba078fa8b7 (patch) | |
tree | f9e3a3761133e8470b8428d4b6f2b67681e96734 | |
parent | 833c2c083856ef3077b51c908ec401fa0a130d57 (diff) | |
download | linux-a1b92973fba47ceaeb0e337132876aba078fa8b7.tar.bz2 |
Input: st1232 - switch to using MT-B protocol
Switch the driver to the slotted variant of multitouch protocol (MT-B)
with in-kernel tracking of the contacts.
Tested-by: Matthias Fend <Matthias.Fend@wolfvision.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
-rw-r--r-- | drivers/input/touchscreen/st1232.c | 110 |
1 files changed, 56 insertions, 54 deletions
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c index a4a3b82ee69d..63b29c7279e2 100644 --- a/drivers/input/touchscreen/st1232.c +++ b/drivers/input/touchscreen/st1232.c @@ -14,23 +14,19 @@ #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input/touchscreen.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pm_qos.h> #include <linux/slab.h> #include <linux/types.h> -#include <linux/input/touchscreen.h> #define ST1232_TS_NAME "st1232-ts" #define ST1633_TS_NAME "st1633-ts" -struct st1232_ts_finger { - u16 x; - u16 y; - u8 t; - bool is_valid; -}; +#define ST_TS_MAX_FINGERS 10 struct st_chip_info { bool have_z; @@ -50,12 +46,10 @@ struct st1232_ts_data { const struct st_chip_info *chip_info; int read_buf_len; u8 *read_buf; - struct st1232_ts_finger fingers[]; }; static int st1232_ts_read_data(struct st1232_ts_data *ts) { - struct st1232_ts_finger *finger = ts->fingers; struct i2c_client *client = ts->client; u8 start_reg = ts->chip_info->start_reg; struct i2c_msg msg[] = { @@ -72,59 +66,69 @@ static int st1232_ts_read_data(struct st1232_ts_data *ts) } }; int ret; - int i; - u8 *buf; ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) return ret < 0 ? ret : -EIO; + return 0; +} + +static int st1232_ts_parse_and_report(struct st1232_ts_data *ts) +{ + struct input_dev *input = ts->input_dev; + struct input_mt_pos pos[ST_TS_MAX_FINGERS]; + u8 z[ST_TS_MAX_FINGERS]; + int slots[ST_TS_MAX_FINGERS]; + int n_contacts = 0; + int i; + for (i = 0; i < ts->chip_info->max_fingers; i++) { - buf = &ts->read_buf[i * 4]; - finger[i].is_valid = buf[0] >> 7; - if (finger[i].is_valid) { - finger[i].x = ((buf[0] & 0x70) << 4) | buf[1]; - finger[i].y = ((buf[0] & 0x07) << 8) | buf[2]; + u8 *buf = &ts->read_buf[i * 4]; + + if (buf[0] & BIT(7)) { + unsigned int x = ((buf[0] & 0x70) << 4) | buf[1]; + unsigned int y = ((buf[0] & 0x07) << 8) | buf[2]; + + touchscreen_set_mt_pos(&pos[n_contacts], + &ts->prop, x, y); /* st1232 includes a z-axis / touch strength */ if (ts->chip_info->have_z) - finger[i].t = ts->read_buf[i + 6]; + z[n_contacts] = ts->read_buf[i + 6]; + + n_contacts++; } } - return 0; + input_mt_assign_slots(input, slots, pos, n_contacts, 0); + for (i = 0; i < n_contacts; i++) { + input_mt_slot(input, slots[i]); + input_mt_report_slot_state(input, MT_TOOL_FINGER, true); + input_report_abs(input, ABS_MT_POSITION_X, pos[i].x); + input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y); + if (ts->chip_info->have_z) + input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]); + } + + input_mt_sync_frame(input); + input_sync(input); + + return n_contacts; } static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) { struct st1232_ts_data *ts = dev_id; - struct st1232_ts_finger *finger = ts->fingers; - struct input_dev *input_dev = ts->input_dev; - int count = 0; - int i, ret; - - ret = st1232_ts_read_data(ts); - if (ret < 0) - goto end; - - /* multi touch protocol */ - for (i = 0; i < ts->chip_info->max_fingers; i++) { - if (!finger[i].is_valid) - continue; + int count; + int error; - if (ts->chip_info->have_z) - input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, - finger[i].t); + error = st1232_ts_read_data(ts); + if (error) + goto out; - touchscreen_report_pos(input_dev, &ts->prop, - finger[i].x, finger[i].y, true); - input_mt_sync(input_dev); - count++; - } - - /* SYN_MT_REPORT only if no contact */ + count = st1232_ts_parse_and_report(ts); if (!count) { - input_mt_sync(input_dev); if (ts->low_latency_req.dev) { dev_pm_qos_remove_request(&ts->low_latency_req); ts->low_latency_req.dev = NULL; @@ -136,10 +140,7 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) DEV_PM_QOS_RESUME_LATENCY, 100); } - /* SYN_REPORT */ - input_sync(input_dev); - -end: +out: return IRQ_HANDLED; } @@ -198,9 +199,7 @@ static int st1232_ts_probe(struct i2c_client *client, return -EINVAL; } - ts = devm_kzalloc(&client->dev, - struct_size(ts, fingers, match->max_fingers), - GFP_KERNEL); + ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM; @@ -240,11 +239,6 @@ static int st1232_ts_probe(struct i2c_client *client, input_dev->name = "st1232-touchscreen"; input_dev->id.bustype = BUS_I2C; - __set_bit(INPUT_PROP_DIRECT, input_dev->propbit); - __set_bit(EV_SYN, input_dev->evbit); - __set_bit(EV_KEY, input_dev->evbit); - __set_bit(EV_ABS, input_dev->evbit); - if (ts->chip_info->have_z) input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, ts->chip_info->max_area, 0, 0); @@ -256,6 +250,14 @@ static int st1232_ts_probe(struct i2c_client *client, touchscreen_parse_properties(input_dev, true, &ts->prop); + error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers, + INPUT_MT_DIRECT | INPUT_MT_TRACK | + INPUT_MT_DROP_UNUSED); + if (error) { + dev_err(&client->dev, "failed to initialize MT slots\n"); + return error; + } + error = devm_request_threaded_irq(&client->dev, client->irq, NULL, st1232_ts_irq_handler, IRQF_ONESHOT, |