1 // SPDX-License-Identifier: GPL-2.0-only
9  *  - ads7846.c
12  *  - corgi_ts.c
13  *	Copyright (C) 2004-2005 Richard Purdie
14  *  - omap_ts.[hc], ads7846.h, ts_osk.c
36 	data = i2c_smbus_read_word_data(tsc->client, cmd);  in tsc2007_xfer()
38 		dev_err(&tsc->client->dev, "i2c io error: %d\n", data);  in tsc2007_xfer()
44 	 * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].  in tsc2007_xfer()
48 	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);  in tsc2007_xfer()
55 	/* y- still on; turn on only y+ (and ADC) */  in tsc2007_read_values()
56 	tc->y = tsc2007_xfer(tsc, READ_Y);  in tsc2007_read_values()
58 	/* turn y- off, x+ on, then leave in lowpower */  in tsc2007_read_values()
59 	tc->x = tsc2007_xfer(tsc, READ_X);  in tsc2007_read_values()
61 	/* turn y+ off, x- on; we'll use formula #1 */  in tsc2007_read_values()
62 	tc->z1 = tsc2007_xfer(tsc, READ_Z1);  in tsc2007_read_values()
63 	tc->z2 = tsc2007_xfer(tsc, READ_Z2);  in tsc2007_read_values()
65 	/* Prepare for next touch reading - power down ADC, enable PENIRQ */  in tsc2007_read_values()
74 	if (tc->x == MAX_12BIT)  in tsc2007_calculate_resistance()
75 		tc->x = 0;  in tsc2007_calculate_resistance()
77 	if (likely(tc->x && tc->z1)) {  in tsc2007_calculate_resistance()
79 		rt = tc->z2 - tc->z1;  in tsc2007_calculate_resistance()
80 		rt *= tc->x;  in tsc2007_calculate_resistance()
81 		rt *= tsc->x_plate_ohms;  in tsc2007_calculate_resistance()
82 		rt /= tc->z1;  in tsc2007_calculate_resistance()
105 	if (!ts->get_pendown_state)  in tsc2007_is_pen_down()
108 	return ts->get_pendown_state(&ts->client->dev);  in tsc2007_is_pen_down()
114 	struct input_dev *input = ts->input;  in tsc2007_soft_irq()
118 	while (!ts->stopped && tsc2007_is_pen_down(ts)) {  in tsc2007_soft_irq()
122 		mutex_lock(&ts->mlock);  in tsc2007_soft_irq()
124 		mutex_unlock(&ts->mlock);  in tsc2007_soft_irq()
128 		if (!rt && !ts->get_pendown_state) {  in tsc2007_soft_irq()
137 		if (rt <= ts->max_rt) {  in tsc2007_soft_irq()
138 			dev_dbg(&ts->client->dev,  in tsc2007_soft_irq()
140 				tc.x, tc.y, rt);  in tsc2007_soft_irq()
142 			rt = ts->max_rt - rt;  in tsc2007_soft_irq()
146 			input_report_abs(input, ABS_Y, tc.y);  in tsc2007_soft_irq()
157 			dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);  in tsc2007_soft_irq()
160 		wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);  in tsc2007_soft_irq()
163 	dev_dbg(&ts->client->dev, "UP\n");  in tsc2007_soft_irq()
169 	if (ts->clear_penirq)  in tsc2007_soft_irq()
170 		ts->clear_penirq();  in tsc2007_soft_irq()
177 	ts->stopped = true;  in tsc2007_stop()
179 	wake_up(&ts->wait);  in tsc2007_stop()
181 	disable_irq(ts->irq);  in tsc2007_stop()
189 	ts->stopped = false;  in tsc2007_open()
192 	enable_irq(ts->irq);  in tsc2007_open()
194 	/* Prepare for touch readings - power down ADC and enable PENIRQ */  in tsc2007_open()
216 	return gpiod_get_value_cansleep(ts->gpiod);  in tsc2007_get_pendown_state_gpio()
224 	if (!device_property_read_u32(dev, "ti,max-rt", &val32))  in tsc2007_probe_properties()
225 		ts->max_rt = val32;  in tsc2007_probe_properties()
227 		ts->max_rt = MAX_12BIT;  in tsc2007_probe_properties()
230 		ts->fuzzx = val32;  in tsc2007_probe_properties()
233 		ts->fuzzy = val32;  in tsc2007_probe_properties()
236 		ts->fuzzz = val32;  in tsc2007_probe_properties()
238 	if (!device_property_read_u64(dev, "ti,poll-period", &val64))  in tsc2007_probe_properties()
239 		ts->poll_period = msecs_to_jiffies(val64);  in tsc2007_probe_properties()
241 		ts->poll_period = msecs_to_jiffies(1);  in tsc2007_probe_properties()
243 	if (!device_property_read_u32(dev, "ti,x-plate-ohms", &val32)) {  in tsc2007_probe_properties()
244 		ts->x_plate_ohms = val32;  in tsc2007_probe_properties()
246 		dev_err(dev, "Missing ti,x-plate-ohms device property\n");  in tsc2007_probe_properties()
247 		return -EINVAL;  in tsc2007_probe_properties()
250 	ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);  in tsc2007_probe_properties()
251 	if (IS_ERR(ts->gpiod))  in tsc2007_probe_properties()
252 		return PTR_ERR(ts->gpiod);  in tsc2007_probe_properties()
254 	if (ts->gpiod)  in tsc2007_probe_properties()
255 		ts->get_pendown_state = tsc2007_get_pendown_state_gpio;  in tsc2007_probe_properties()
266 	ts->model             = pdata->model;  in tsc2007_probe_pdev()
267 	ts->x_plate_ohms      = pdata->x_plate_ohms;  in tsc2007_probe_pdev()
268 	ts->max_rt            = pdata->max_rt ? : MAX_12BIT;  in tsc2007_probe_pdev()
269 	ts->poll_period       = msecs_to_jiffies(pdata->poll_period ? : 1);  in tsc2007_probe_pdev()
270 	ts->get_pendown_state = pdata->get_pendown_state;  in tsc2007_probe_pdev()
271 	ts->clear_penirq      = pdata->clear_penirq;  in tsc2007_probe_pdev()
272 	ts->fuzzx             = pdata->fuzzx;  in tsc2007_probe_pdev()
273 	ts->fuzzy             = pdata->fuzzy;  in tsc2007_probe_pdev()
274 	ts->fuzzz             = pdata->fuzzz;  in tsc2007_probe_pdev()
276 	if (pdata->x_plate_ohms == 0) {  in tsc2007_probe_pdev()
278 		return -EINVAL;  in tsc2007_probe_pdev()
289 	pdata->exit_platform_hw();  in tsc2007_call_exit_platform_hw()
296 		dev_get_platdata(&client->dev);  in tsc2007_probe()
301 	if (!i2c_check_functionality(client->adapter,  in tsc2007_probe()
303 		return -EIO;  in tsc2007_probe()
305 	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);  in tsc2007_probe()
307 		return -ENOMEM;  in tsc2007_probe()
310 		err = tsc2007_probe_pdev(&client->dev, ts, pdata, id);  in tsc2007_probe()
312 		err = tsc2007_probe_properties(&client->dev, ts);  in tsc2007_probe()
316 	input_dev = devm_input_allocate_device(&client->dev);  in tsc2007_probe()
318 		return -ENOMEM;  in tsc2007_probe()
322 	ts->client = client;  in tsc2007_probe()
323 	ts->irq = client->irq;  in tsc2007_probe()
324 	ts->input = input_dev;  in tsc2007_probe()
326 	init_waitqueue_head(&ts->wait);  in tsc2007_probe()
327 	mutex_init(&ts->mlock);  in tsc2007_probe()
329 	snprintf(ts->phys, sizeof(ts->phys),  in tsc2007_probe()
330 		 "%s/input0", dev_name(&client->dev));  in tsc2007_probe()
332 	input_dev->name = "TSC2007 Touchscreen";  in tsc2007_probe()
333 	input_dev->phys = ts->phys;  in tsc2007_probe()
334 	input_dev->id.bustype = BUS_I2C;  in tsc2007_probe()
336 	input_dev->open = tsc2007_open;  in tsc2007_probe()
337 	input_dev->close = tsc2007_close;  in tsc2007_probe()
343 	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);  in tsc2007_probe()
344 	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);  in tsc2007_probe()
346 			     ts->fuzzz, 0);  in tsc2007_probe()
349 		if (pdata->exit_platform_hw) {  in tsc2007_probe()
350 			err = devm_add_action(&client->dev,  in tsc2007_probe()
352 					      &client->dev);  in tsc2007_probe()
354 				dev_err(&client->dev,  in tsc2007_probe()
361 		if (pdata->init_platform_hw)  in tsc2007_probe()
362 			pdata->init_platform_hw();  in tsc2007_probe()
365 	err = devm_request_threaded_irq(&client->dev, ts->irq,  in tsc2007_probe()
368 					client->dev.driver->name, ts);  in tsc2007_probe()
370 		dev_err(&client->dev, "Failed to request irq %d: %d\n",  in tsc2007_probe()
371 			ts->irq, err);  in tsc2007_probe()
380 		dev_err(&client->dev,  in tsc2007_probe()
387 		dev_err(&client->dev,  in tsc2007_probe()
394 		dev_err(&client->dev,  in tsc2007_probe()