input/touchscreen/ads7846.c

218 static int get_pendown_state(struct ads7846 *ts)
220 	if (ts->get_pendown_state)
221 		return ts->get_pendown_state();
223 	return gpiod_get_value(ts->gpio_pendown);
226 static void ads7846_report_pen_up(struct ads7846 *ts)
228 	struct input_dev *input = ts->input;
234 	ts->pendown = false;
235 	dev_vdbg(&ts->spi->dev, "UP\n");
238 /* Must be called with ts->lock held */
239 static void ads7846_stop(struct ads7846 *ts)
241 	if (!ts->disabled && !ts->suspended) {
243 		ts->stopped = true;
245 		wake_up(&ts->wait);
246 		disable_irq(ts->spi->irq);
250 /* Must be called with ts->lock held */
251 static void ads7846_restart(struct ads7846 *ts)
253 	if (!ts->disabled && !ts->suspended) {
255 		if (ts->pendown && !get_pendown_state(ts))
256 			ads7846_report_pen_up(ts);
259 		ts->stopped = false;
261 		enable_irq(ts->spi->irq);
265 /* Must be called with ts->lock held */
266 static void __ads7846_disable(struct ads7846 *ts)
268 	ads7846_stop(ts);
269 	regulator_disable(ts->reg);
277 /* Must be called with ts->lock held */
278 static void __ads7846_enable(struct ads7846 *ts)
282 	error = regulator_enable(ts->reg);
284 		dev_err(&ts->spi->dev, "Failed to enable supply: %d\n", error);
286 	ads7846_restart(ts);
289 static void ads7846_disable(struct ads7846 *ts)
291 	mutex_lock(&ts->lock);
293 	if (!ts->disabled) {
295 		if  (!ts->suspended)
296 			__ads7846_disable(ts);
298 		ts->disabled = true;
301 	mutex_unlock(&ts->lock);
304 static void ads7846_enable(struct ads7846 *ts)
306 	mutex_lock(&ts->lock);
308 	if (ts->disabled) {
310 		ts->disabled = false;
312 		if (!ts->suspended)
313 			__ads7846_enable(ts);
316 	mutex_unlock(&ts->lock);
355 	struct ads7846 *ts = dev_get_drvdata(dev);
366 	if (ts->use_internal) {
376 		req->xfer[1].delay.value = ts->vref_delay_usecs;
410 	mutex_lock(&ts->lock);
411 	ads7846_stop(ts);
413 	ads7846_restart(ts);
414 	mutex_unlock(&ts->lock);
430 	struct ads7846 *ts = dev_get_drvdata(dev);
446 	mutex_lock(&ts->lock);
447 	ads7846_stop(ts);
449 	ads7846_restart(ts);
450 	mutex_unlock(&ts->lock);
468 	struct ads7846 *ts = dev_get_drvdata(dev); \
469 	ssize_t v = ads7846_read12_ser(&ts->spi->dev, \
473 	return sprintf(buf, "%u\n", adjust(ts, v)); \
483 static inline unsigned null_adjust(struct ads7846 *ts, ssize_t v)
496 static inline unsigned vaux_adjust(struct ads7846 *ts, ssize_t v)
501 	retval *= ts->vref_mv;
507 static inline unsigned vbatt_adjust(struct ads7846 *ts, ssize_t v)
509 	unsigned retval = vaux_adjust(ts, v);
512 	if (ts->model == 7846)
525 	struct ads7846 *ts = dev_get_drvdata(dev);
527 	if (ts->model == 7843 && index < 2)	/* in0, in1 */
529 	if (ts->model == 7845 && index != 2)	/* in0 */
549 static int ads784x_hwmon_register(struct spi_device *spi, struct ads7846 *ts)
554 	switch (ts->model) {
556 		if (!ts->vref_mv) {
558 			ts->vref_mv = 2500;
559 			ts->use_internal = true;
564 		if (!ts->vref_mv) {
567 				ts->model);
574 						       spi->modalias, ts,
582 					 struct ads7846 *ts)
591 	struct ads7846 *ts = dev_get_drvdata(dev);
593 	return sprintf(buf, "%u\n", ts->pendown);
601 	struct ads7846 *ts = dev_get_drvdata(dev);
603 	return sprintf(buf, "%u\n", ts->disabled);
610 	struct ads7846 *ts = dev_get_drvdata(dev);
619 		ads7846_disable(ts);
621 		ads7846_enable(ts);
643 	struct ads7846 *ts = ads;
645 	if (!ts->read_cnt || (abs(ts->last_read - *val) > ts->debounce_tol)) {
647 		ts->read_rep = 0;
652 		if (ts->read_cnt < ts->debounce_max) {
653 			ts->last_read = *val;
654 			ts->read_cnt++;
663 			ts->read_cnt = 0;
667 		if (++ts->read_rep > ts->debounce_rep) {
672 			ts->read_cnt = 0;
673 			ts->read_rep = 0;
677 			ts->read_cnt++;
698 static void ads7846_set_cmd_val(struct ads7846 *ts, enum ads7846_cmds cmd_idx,
701 	struct ads7846_packet *packet = ts->packet;
760 static int ads7846_filter(struct ads7846 *ts)
762 	struct ads7846_packet *packet = ts->packet;
776 			action = ts->filter(ts->filter_data, cmd_idx, &val);
781 				ads7846_set_cmd_val(ts, cmd_idx, val);
793 static void ads7846_read_state(struct ads7846 *ts)
795 	struct ads7846_packet *packet = ts->packet;
803 		ts->wait_for_sync();
805 		m = &ts->msg[msg_idx];
806 		error = spi_sync(ts->spi, m);
808 			dev_err(&ts->spi->dev, "spi_sync --> %d\n", error);
813 		error = ads7846_filter(ts);
821 static void ads7846_report_state(struct ads7846 *ts)
823 	struct ads7846_packet *packet = ts->packet;
829 	if (ts->model == 7845) {
841 	if (ts->model == 7843 || ts->model == 7845) {
842 		Rt = ts->pressure_max / 2;
847 		Rt *= ts->x_plate_ohms;
861 	if (packet->ignore || Rt > ts->pressure_max) {
862 		dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n",
871 	if (ts->penirq_recheck_delay_usecs) {
872 		udelay(ts->penirq_recheck_delay_usecs);
873 		if (!get_pendown_state(ts))
887 		struct input_dev *input = ts->input;
889 		if (!ts->pendown) {
891 			ts->pendown = true;
892 			dev_vdbg(&ts->spi->dev, "DOWN\n");
895 		touchscreen_report_pos(input, &ts->core_prop, x, y, false);
896 		input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt);
899 		dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt);
905 	struct ads7846 *ts = handle;
907 	return get_pendown_state(ts) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
913 	struct ads7846 *ts = handle;
918 	while (!ts->stopped && get_pendown_state(ts)) {
921 		ads7846_read_state(ts);
923 		if (!ts->stopped)
924 			ads7846_report_state(ts);
926 		wait_event_timeout(ts->wait, ts->stopped,
930 	if (ts->pendown && !ts->stopped)
931 		ads7846_report_pen_up(ts);
938 	struct ads7846 *ts = dev_get_drvdata(dev);
940 	mutex_lock(&ts->lock);
942 	if (!ts->suspended) {
944 		if (!ts->disabled)
945 			__ads7846_disable(ts);
947 		if (device_may_wakeup(&ts->spi->dev))
948 			enable_irq_wake(ts->spi->irq);
950 		ts->suspended = true;
953 	mutex_unlock(&ts->lock);
960 	struct ads7846 *ts = dev_get_drvdata(dev);
962 	mutex_lock(&ts->lock);
964 	if (ts->suspended) {
966 		ts->suspended = false;
968 		if (device_may_wakeup(&ts->spi->dev))
969 			disable_irq_wake(ts->spi->irq);
971 		if (!ts->disabled)
972 			__ads7846_enable(ts);
975 	mutex_unlock(&ts->lock);
983 				 struct ads7846 *ts,
993 		ts->get_pendown_state = pdata->get_pendown_state;
995 		ts->gpio_pendown = gpiod_get(&spi->dev, "pendown", GPIOD_IN);
996 		if (IS_ERR(ts->gpio_pendown)) {
998 			return PTR_ERR(ts->gpio_pendown);
1001 			gpiod_set_debounce(ts->gpio_pendown,
1012 static int ads7846_setup_spi_msg(struct ads7846 *ts,
1015 	struct spi_message *m = &ts->msg[0];
1016 	struct spi_transfer *x = ts->xfer;
1017 	struct ads7846_packet *packet = ts->packet;
1025 	time = NSEC_PER_SEC / ts->spi->max_speed_hz;
1030 	if (ts->debounce_max && ts->debounce_rep)
1031 		/* ads7846_debounce_filter() is making ts->debounce_rep + 2
1033 		packet->count = ts->debounce_rep + 2;
1037 	if (ts->model == 7846)
1061 	packet->tx = devm_kzalloc(&ts->spi->dev, size, GFP_KERNEL);
1065 	packet->rx = devm_kzalloc(&ts->spi->dev, size, GFP_KERNEL);
1069 	if (ts->model == 7873) {
1075 		ts->model = 7846;
1079 	ts->msg_count = 1;
1081 	m->context = ts;
1177 	struct ads7846 *ts;
1208 	ts = devm_kzalloc(dev, sizeof(struct ads7846), GFP_KERNEL);
1209 	if (!ts)
1220 	spi_set_drvdata(spi, ts);
1222 	ts->packet = packet;
1223 	ts->spi = spi;
1224 	ts->input = input_dev;
1226 	mutex_init(&ts->lock);
1227 	init_waitqueue_head(&ts->wait);
1236 	ts->model = pdata->model ? : 7846;
1237 	ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
1238 	ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
1239 	ts->vref_mv = pdata->vref_mv;
1242 		ts->debounce_max = pdata->debounce_max;
1243 		if (ts->debounce_max < 2)
1244 			ts->debounce_max = 2;
1245 		ts->debounce_tol = pdata->debounce_tol;
1246 		ts->debounce_rep = pdata->debounce_rep;
1247 		ts->filter = ads7846_debounce_filter;
1248 		ts->filter_data = ts;
1250 		ts->filter = ads7846_no_filter;
1253 	err = ads7846_setup_pendown(spi, ts, pdata);
1258 		ts->penirq_recheck_delay_usecs =
1261 	ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
1263 	snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
1264 	snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model);
1266 	input_dev->name = ts->name;
1267 	input_dev->phys = ts->phys;
1281 	if (ts->model != 7845)
1290 	touchscreen_parse_properties(ts->input, false, &ts->core_prop);
1291 	ts->pressure_max = input_abs_get_max(input_dev, ABS_PRESSURE) ? : ~0;
1297 	if (!ts->core_prop.swap_x_y && pdata->swap_xy) {
1299 		ts->core_prop.swap_x_y = true;
1302 	ads7846_setup_spi_msg(ts, pdata);
1304 	ts->reg = devm_regulator_get(dev, "vcc");
1305 	if (IS_ERR(ts->reg)) {
1306 		err = PTR_ERR(ts->reg);
1311 	err = regulator_enable(ts->reg);
1317 	err = devm_add_action_or_reset(dev, ads7846_regulator_disable, ts->reg);
1326 					irq_flags, dev->driver->name, ts);
1334 						ts);
1342 	err = ads784x_hwmon_register(spi, ts);
1352 	if (ts->model == 7845)
1375 	struct ads7846 *ts = spi_get_drvdata(spi);
1377 	ads7846_stop(ts);