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Input: pixcir_i2c_ts - support up to 5 fingers and hardware tracking IDs
Some variants of the Pixcir touch controller support up to 5 simultaneous fingers and hardware tracking IDs. Prepare the driver for that. Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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@ -27,18 +27,20 @@
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#include <linux/input/pixcir_ts.h>
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#include <linux/gpio.h>
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#define PIXCIR_MAX_SLOTS 2
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#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
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struct pixcir_i2c_ts_data {
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struct i2c_client *client;
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struct input_dev *input;
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const struct pixcir_ts_platform_data *chip;
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const struct pixcir_ts_platform_data *pdata;
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bool running;
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int max_fingers; /* Max fingers supported in this instance */
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};
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struct pixcir_touch {
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int x;
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int y;
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int id;
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};
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struct pixcir_report_data {
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@ -49,13 +51,21 @@ struct pixcir_report_data {
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static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
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struct pixcir_report_data *report)
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{
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u8 rdbuf[10], wrbuf[1] = { 0 };
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u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
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u8 wrbuf[1] = { 0 };
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u8 *bufptr;
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u8 touch;
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int ret, i;
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int readsize;
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const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
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memset(report, 0, sizeof(struct pixcir_report_data));
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i = chip->has_hw_ids ? 1 : 0;
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readsize = 2 + tsdata->max_fingers * (4 + i);
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if (readsize > sizeof(rdbuf))
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readsize = sizeof(rdbuf);
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ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
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if (ret != sizeof(wrbuf)) {
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dev_err(&tsdata->client->dev,
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@ -64,7 +74,7 @@ static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
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return;
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}
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ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
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ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
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if (ret != sizeof(rdbuf)) {
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dev_err(&tsdata->client->dev,
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"%s: i2c_master_recv failed(), ret=%d\n",
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@ -73,8 +83,8 @@ static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
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}
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touch = rdbuf[0] & 0x7;
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if (touch > PIXCIR_MAX_SLOTS)
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touch = PIXCIR_MAX_SLOTS;
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if (touch > tsdata->max_fingers)
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touch = tsdata->max_fingers;
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report->num_touches = touch;
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bufptr = &rdbuf[2];
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@ -83,7 +93,12 @@ static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
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report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
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report->touches[i].y = (bufptr[3] << 8) | bufptr[2];
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bufptr = bufptr + 4;
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if (chip->has_hw_ids) {
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report->touches[i].id = bufptr[4];
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bufptr = bufptr + 5;
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} else {
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bufptr = bufptr + 4;
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}
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}
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}
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@ -95,22 +110,35 @@ static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
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struct pixcir_touch *touch;
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int n, i, slot;
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struct device *dev = &ts->client->dev;
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const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
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n = report->num_touches;
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if (n > PIXCIR_MAX_SLOTS)
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n = PIXCIR_MAX_SLOTS;
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for (i = 0; i < n; i++) {
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touch = &report->touches[i];
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pos[i].x = touch->x;
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pos[i].y = touch->y;
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if (!chip->has_hw_ids) {
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for (i = 0; i < n; i++) {
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touch = &report->touches[i];
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pos[i].x = touch->x;
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pos[i].y = touch->y;
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}
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input_mt_assign_slots(ts->input, slots, pos, n);
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}
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input_mt_assign_slots(ts->input, slots, pos, n);
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for (i = 0; i < n; i++) {
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touch = &report->touches[i];
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slot = slots[i];
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if (chip->has_hw_ids) {
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slot = input_mt_get_slot_by_key(ts->input, touch->id);
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if (slot < 0) {
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dev_dbg(dev, "no free slot for id 0x%x\n",
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touch->id);
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continue;
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}
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} else {
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slot = slots[i];
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}
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input_mt_slot(ts->input, slot);
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input_mt_report_slot_state(ts->input,
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@ -130,7 +158,7 @@ static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
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static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
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{
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struct pixcir_i2c_ts_data *tsdata = dev_id;
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const struct pixcir_ts_platform_data *pdata = tsdata->chip;
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const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
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struct pixcir_report_data report;
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while (tsdata->running) {
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@ -399,6 +427,11 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
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return -EINVAL;
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}
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if (!pdata->chip.max_fingers) {
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dev_err(dev, "Invalid max_fingers in pdata\n");
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return -EINVAL;
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}
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tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
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if (!tsdata)
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return -ENOMEM;
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@ -411,7 +444,7 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
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tsdata->client = client;
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tsdata->input = input;
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tsdata->chip = pdata;
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tsdata->pdata = pdata;
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input->name = client->name;
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input->id.bustype = BUS_I2C;
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@ -427,7 +460,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
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error = input_mt_init_slots(input, PIXCIR_MAX_SLOTS,
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tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
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if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
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tsdata->max_fingers = PIXCIR_MAX_SLOTS;
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dev_info(dev, "Limiting maximum fingers to %d\n",
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tsdata->max_fingers);
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}
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error = input_mt_init_slots(input, tsdata->max_fingers,
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INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
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if (error) {
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dev_err(dev, "Error initializing Multi-Touch slots\n");
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@ -43,10 +43,22 @@ enum pixcir_int_mode {
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#define PIXCIR_INT_ENABLE (1UL << 3)
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#define PIXCIR_INT_POL_HIGH (1UL << 2)
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/**
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* struct pixcir_irc_chip_data - chip related data
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* @max_fingers: Max number of fingers reported simultaneously by h/w
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* @has_hw_ids: Hardware supports finger tracking IDs
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*
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*/
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struct pixcir_i2c_chip_data {
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u8 max_fingers;
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bool has_hw_ids;
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};
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struct pixcir_ts_platform_data {
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int x_max;
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int y_max;
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int gpio_attb; /* GPIO connected to ATTB line */
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struct pixcir_i2c_chip_data chip;
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};
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#endif
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