2 * Driver for Pixcir I2C touchscreen controllers.
4 * Copyright (C) 2010-2011 Pixcir, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/delay.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/slab.h>
24 #include <linux/i2c.h>
25 #include <linux/input.h>
26 #include <linux/input/mt.h>
27 #include <linux/input/pixcir_ts.h>
28 #include <linux/gpio.h>
30 #include <linux/of_gpio.h>
31 #include <linux/of_device.h>
33 #define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
35 struct pixcir_i2c_ts_data {
36 struct i2c_client *client;
37 struct input_dev *input;
38 const struct pixcir_ts_platform_data *pdata;
40 int max_fingers; /* Max fingers supported in this instance */
49 struct pixcir_report_data {
51 struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
54 static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
55 struct pixcir_report_data *report)
57 u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
63 const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
65 memset(report, 0, sizeof(struct pixcir_report_data));
67 i = chip->has_hw_ids ? 1 : 0;
68 readsize = 2 + tsdata->max_fingers * (4 + i);
69 if (readsize > sizeof(rdbuf))
70 readsize = sizeof(rdbuf);
72 ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
73 if (ret != sizeof(wrbuf)) {
74 dev_err(&tsdata->client->dev,
75 "%s: i2c_master_send failed(), ret=%d\n",
80 ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
81 if (ret != sizeof(rdbuf)) {
82 dev_err(&tsdata->client->dev,
83 "%s: i2c_master_recv failed(), ret=%d\n",
88 touch = rdbuf[0] & 0x7;
89 if (touch > tsdata->max_fingers)
90 touch = tsdata->max_fingers;
92 report->num_touches = touch;
95 for (i = 0; i < touch; i++) {
96 report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
97 report->touches[i].y = (bufptr[3] << 8) | bufptr[2];
99 if (chip->has_hw_ids) {
100 report->touches[i].id = bufptr[4];
108 static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
109 struct pixcir_report_data *report)
111 struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
112 int slots[PIXCIR_MAX_SLOTS];
113 struct pixcir_touch *touch;
115 struct device *dev = &ts->client->dev;
116 const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
118 n = report->num_touches;
119 if (n > PIXCIR_MAX_SLOTS)
120 n = PIXCIR_MAX_SLOTS;
122 if (!chip->has_hw_ids) {
123 for (i = 0; i < n; i++) {
124 touch = &report->touches[i];
129 input_mt_assign_slots(ts->input, slots, pos, n);
132 for (i = 0; i < n; i++) {
133 touch = &report->touches[i];
135 if (chip->has_hw_ids) {
136 slot = input_mt_get_slot_by_key(ts->input, touch->id);
138 dev_dbg(dev, "no free slot for id 0x%x\n",
146 input_mt_slot(ts->input, slot);
147 input_mt_report_slot_state(ts->input,
148 MT_TOOL_FINGER, true);
150 input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
151 input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
153 dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
154 i, slot, touch->x, touch->y);
157 input_mt_sync_frame(ts->input);
158 input_sync(ts->input);
161 static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
163 struct pixcir_i2c_ts_data *tsdata = dev_id;
164 const struct pixcir_ts_platform_data *pdata = tsdata->pdata;
165 struct pixcir_report_data report;
167 while (tsdata->running) {
169 pixcir_ts_parse(tsdata, &report);
172 pixcir_ts_report(tsdata, &report);
174 if (gpio_get_value(pdata->gpio_attb)) {
175 if (report.num_touches) {
177 * Last report with no finger up?
180 input_mt_sync_frame(tsdata->input);
181 input_sync(tsdata->input);
192 static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
193 enum pixcir_power_mode mode)
195 struct device *dev = &ts->client->dev;
198 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
200 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
201 __func__, PIXCIR_REG_POWER_MODE, ret);
205 ret &= ~PIXCIR_POWER_MODE_MASK;
208 /* Always AUTO_IDLE */
209 ret |= PIXCIR_POWER_ALLOW_IDLE;
211 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
213 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
214 __func__, PIXCIR_REG_POWER_MODE, ret);
222 * Set the interrupt mode for the device i.e. ATTB line behaviour
224 * @polarity : 1 for active high, 0 for active low.
226 static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
227 enum pixcir_int_mode mode, bool polarity)
229 struct device *dev = &ts->client->dev;
232 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
234 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
235 __func__, PIXCIR_REG_INT_MODE, ret);
239 ret &= ~PIXCIR_INT_MODE_MASK;
243 ret |= PIXCIR_INT_POL_HIGH;
245 ret &= ~PIXCIR_INT_POL_HIGH;
247 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
249 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
250 __func__, PIXCIR_REG_INT_MODE, ret);
258 * Enable/disable interrupt generation
260 static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
262 struct device *dev = &ts->client->dev;
265 ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
267 dev_err(dev, "%s: can't read reg 0x%x : %d\n",
268 __func__, PIXCIR_REG_INT_MODE, ret);
273 ret |= PIXCIR_INT_ENABLE;
275 ret &= ~PIXCIR_INT_ENABLE;
277 ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
279 dev_err(dev, "%s: can't write reg 0x%x : %d\n",
280 __func__, PIXCIR_REG_INT_MODE, ret);
287 static int pixcir_start(struct pixcir_i2c_ts_data *ts)
289 struct device *dev = &ts->client->dev;
292 /* LEVEL_TOUCH interrupt with active low polarity */
293 error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
295 dev_err(dev, "Failed to set interrupt mode: %d\n", error);
300 mb(); /* Update status before IRQ can fire */
302 /* enable interrupt generation */
303 error = pixcir_int_enable(ts, true);
305 dev_err(dev, "Failed to enable interrupt generation: %d\n",
313 static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
317 /* Disable interrupt generation */
318 error = pixcir_int_enable(ts, false);
320 dev_err(&ts->client->dev,
321 "Failed to disable interrupt generation: %d\n",
326 /* Exit ISR if running, no more report parsing */
328 mb(); /* update status before we synchronize irq */
330 /* Wait till running ISR is complete */
331 synchronize_irq(ts->client->irq);
336 static int pixcir_input_open(struct input_dev *dev)
338 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
340 return pixcir_start(ts);
343 static void pixcir_input_close(struct input_dev *dev)
345 struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
350 #ifdef CONFIG_PM_SLEEP
351 static int pixcir_i2c_ts_suspend(struct device *dev)
353 struct i2c_client *client = to_i2c_client(dev);
354 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
355 struct input_dev *input = ts->input;
358 mutex_lock(&input->mutex);
360 if (device_may_wakeup(&client->dev)) {
362 ret = pixcir_start(ts);
364 dev_err(dev, "Failed to start\n");
369 enable_irq_wake(client->irq);
370 } else if (input->users) {
371 ret = pixcir_stop(ts);
375 mutex_unlock(&input->mutex);
380 static int pixcir_i2c_ts_resume(struct device *dev)
382 struct i2c_client *client = to_i2c_client(dev);
383 struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
384 struct input_dev *input = ts->input;
387 mutex_lock(&input->mutex);
389 if (device_may_wakeup(&client->dev)) {
390 disable_irq_wake(client->irq);
393 ret = pixcir_stop(ts);
395 dev_err(dev, "Failed to stop\n");
399 } else if (input->users) {
400 ret = pixcir_start(ts);
404 mutex_unlock(&input->mutex);
410 static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
411 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
414 static const struct of_device_id pixcir_of_match[];
416 static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
418 struct pixcir_ts_platform_data *pdata;
419 struct device_node *np = dev->of_node;
420 const struct of_device_id *match;
422 match = of_match_device(of_match_ptr(pixcir_of_match), dev);
424 return ERR_PTR(-EINVAL);
426 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
428 return ERR_PTR(-ENOMEM);
430 pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
432 pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
433 /* gpio_attb validity is checked in probe */
435 if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
436 dev_err(dev, "Failed to get touchscreen-size-x property\n");
437 return ERR_PTR(-EINVAL);
441 if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
442 dev_err(dev, "Failed to get touchscreen-size-y property\n");
443 return ERR_PTR(-EINVAL);
447 dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
448 pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
453 static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
455 return ERR_PTR(-EINVAL);
459 static int pixcir_i2c_ts_probe(struct i2c_client *client,
460 const struct i2c_device_id *id)
462 const struct pixcir_ts_platform_data *pdata =
463 dev_get_platdata(&client->dev);
464 struct device *dev = &client->dev;
465 struct device_node *np = dev->of_node;
466 struct pixcir_i2c_ts_data *tsdata;
467 struct input_dev *input;
471 pdata = pixcir_parse_dt(dev);
473 return PTR_ERR(pdata);
477 dev_err(&client->dev, "platform data not defined\n");
481 if (!gpio_is_valid(pdata->gpio_attb)) {
482 dev_err(dev, "Invalid gpio_attb in pdata\n");
486 if (!pdata->chip.max_fingers) {
487 dev_err(dev, "Invalid max_fingers in pdata\n");
491 tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
495 input = devm_input_allocate_device(dev);
497 dev_err(dev, "Failed to allocate input device\n");
501 tsdata->client = client;
502 tsdata->input = input;
503 tsdata->pdata = pdata;
505 input->name = client->name;
506 input->id.bustype = BUS_I2C;
507 input->open = pixcir_input_open;
508 input->close = pixcir_input_close;
509 input->dev.parent = &client->dev;
511 __set_bit(EV_KEY, input->evbit);
512 __set_bit(EV_ABS, input->evbit);
513 __set_bit(BTN_TOUCH, input->keybit);
514 input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
515 input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
516 input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
517 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
519 tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
520 if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
521 tsdata->max_fingers = PIXCIR_MAX_SLOTS;
522 dev_info(dev, "Limiting maximum fingers to %d\n",
523 tsdata->max_fingers);
526 error = input_mt_init_slots(input, tsdata->max_fingers,
527 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
529 dev_err(dev, "Error initializing Multi-Touch slots\n");
533 input_set_drvdata(input, tsdata);
535 error = devm_gpio_request_one(dev, pdata->gpio_attb,
536 GPIOF_DIR_IN, "pixcir_i2c_attb");
538 dev_err(dev, "Failed to request ATTB gpio\n");
542 error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
543 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
544 client->name, tsdata);
546 dev_err(dev, "failed to request irq %d\n", client->irq);
550 /* Always be in IDLE mode to save power, device supports auto wake */
551 error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
553 dev_err(dev, "Failed to set IDLE mode\n");
557 /* Stop device till opened */
558 error = pixcir_stop(tsdata);
562 error = input_register_device(input);
566 i2c_set_clientdata(client, tsdata);
567 device_init_wakeup(&client->dev, 1);
572 static int pixcir_i2c_ts_remove(struct i2c_client *client)
574 device_init_wakeup(&client->dev, 0);
579 static const struct i2c_device_id pixcir_i2c_ts_id[] = {
581 { "pixcir_tangoc", 0 },
584 MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
587 static const struct pixcir_i2c_chip_data pixcir_ts_data = {
589 /* no hw id support */
592 static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
597 static const struct of_device_id pixcir_of_match[] = {
598 { .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
599 { .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
602 MODULE_DEVICE_TABLE(of, pixcir_of_match);
605 static struct i2c_driver pixcir_i2c_ts_driver = {
607 .owner = THIS_MODULE,
609 .pm = &pixcir_dev_pm_ops,
610 .of_match_table = of_match_ptr(pixcir_of_match),
612 .probe = pixcir_i2c_ts_probe,
613 .remove = pixcir_i2c_ts_remove,
614 .id_table = pixcir_i2c_ts_id,
617 module_i2c_driver(pixcir_i2c_ts_driver);
619 MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
620 MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
621 MODULE_LICENSE("GPL");