xref: /linux/drivers/input/touchscreen/tsc2007_core.c (revision 8fd708157a592a376c4d0b3b2ba23b9e9f79caa5)
150b6f1f4SKwangwoo Lee /*
250b6f1f4SKwangwoo Lee  * drivers/input/touchscreen/tsc2007.c
350b6f1f4SKwangwoo Lee  *
450b6f1f4SKwangwoo Lee  * Copyright (c) 2008 MtekVision Co., Ltd.
550b6f1f4SKwangwoo Lee  *	Kwangwoo Lee <kwlee@mtekvision.com>
650b6f1f4SKwangwoo Lee  *
750b6f1f4SKwangwoo Lee  * Using code from:
850b6f1f4SKwangwoo Lee  *  - ads7846.c
950b6f1f4SKwangwoo Lee  *	Copyright (c) 2005 David Brownell
1050b6f1f4SKwangwoo Lee  *	Copyright (c) 2006 Nokia Corporation
1150b6f1f4SKwangwoo Lee  *  - corgi_ts.c
1250b6f1f4SKwangwoo Lee  *	Copyright (C) 2004-2005 Richard Purdie
1350b6f1f4SKwangwoo Lee  *  - omap_ts.[hc], ads7846.h, ts_osk.c
1450b6f1f4SKwangwoo Lee  *	Copyright (C) 2002 MontaVista Software
1550b6f1f4SKwangwoo Lee  *	Copyright (C) 2004 Texas Instruments
1650b6f1f4SKwangwoo Lee  *	Copyright (C) 2005 Dirk Behme
1750b6f1f4SKwangwoo Lee  *
1850b6f1f4SKwangwoo Lee  *  This program is free software; you can redistribute it and/or modify
1950b6f1f4SKwangwoo Lee  *  it under the terms of the GNU General Public License version 2 as
2050b6f1f4SKwangwoo Lee  *  published by the Free Software Foundation.
2150b6f1f4SKwangwoo Lee  */
2250b6f1f4SKwangwoo Lee 
2350b6f1f4SKwangwoo Lee #include <linux/module.h>
2450b6f1f4SKwangwoo Lee #include <linux/slab.h>
2550b6f1f4SKwangwoo Lee #include <linux/input.h>
2650b6f1f4SKwangwoo Lee #include <linux/interrupt.h>
2750b6f1f4SKwangwoo Lee #include <linux/i2c.h>
2807f9e5cfSDenis Carikli #include <linux/of_device.h>
2907f9e5cfSDenis Carikli #include <linux/of_gpio.h>
30*8fd70815SWolfram Sang #include <linux/platform_data/tsc2007.h>
31f1443404SH. Nikolaus Schaller #include "tsc2007.h"
3250b6f1f4SKwangwoo Lee 
33f1443404SH. Nikolaus Schaller int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
3450b6f1f4SKwangwoo Lee {
3550b6f1f4SKwangwoo Lee 	s32 data;
3650b6f1f4SKwangwoo Lee 	u16 val;
3750b6f1f4SKwangwoo Lee 
3850b6f1f4SKwangwoo Lee 	data = i2c_smbus_read_word_data(tsc->client, cmd);
3950b6f1f4SKwangwoo Lee 	if (data < 0) {
4050b6f1f4SKwangwoo Lee 		dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
4150b6f1f4SKwangwoo Lee 		return data;
4250b6f1f4SKwangwoo Lee 	}
4350b6f1f4SKwangwoo Lee 
4450b6f1f4SKwangwoo Lee 	/* The protocol and raw data format from i2c interface:
4550b6f1f4SKwangwoo Lee 	 * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
4650b6f1f4SKwangwoo Lee 	 * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
4750b6f1f4SKwangwoo Lee 	 */
4850b6f1f4SKwangwoo Lee 	val = swab16(data) >> 4;
4950b6f1f4SKwangwoo Lee 
5050b6f1f4SKwangwoo Lee 	dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
5150b6f1f4SKwangwoo Lee 
5250b6f1f4SKwangwoo Lee 	return val;
5350b6f1f4SKwangwoo Lee }
5450b6f1f4SKwangwoo Lee 
55d570e9efSDmitry Torokhov static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc)
5650b6f1f4SKwangwoo Lee {
57d570e9efSDmitry Torokhov 	/* y- still on; turn on only y+ (and ADC) */
58d570e9efSDmitry Torokhov 	tc->y = tsc2007_xfer(tsc, READ_Y);
5950b6f1f4SKwangwoo Lee 
60d570e9efSDmitry Torokhov 	/* turn y- off, x+ on, then leave in lowpower */
61d570e9efSDmitry Torokhov 	tc->x = tsc2007_xfer(tsc, READ_X);
62d570e9efSDmitry Torokhov 
63d570e9efSDmitry Torokhov 	/* turn y+ off, x- on; we'll use formula #1 */
64d570e9efSDmitry Torokhov 	tc->z1 = tsc2007_xfer(tsc, READ_Z1);
65d570e9efSDmitry Torokhov 	tc->z2 = tsc2007_xfer(tsc, READ_Z2);
66d570e9efSDmitry Torokhov 
67d570e9efSDmitry Torokhov 	/* Prepare for next touch reading - power down ADC, enable PENIRQ */
68d570e9efSDmitry Torokhov 	tsc2007_xfer(tsc, PWRDOWN);
69d570e9efSDmitry Torokhov }
70d570e9efSDmitry Torokhov 
71deec586dSH. Nikolaus Schaller u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc)
72d570e9efSDmitry Torokhov {
73d570e9efSDmitry Torokhov 	u32 rt = 0;
7450b6f1f4SKwangwoo Lee 
7550b6f1f4SKwangwoo Lee 	/* range filtering */
76d570e9efSDmitry Torokhov 	if (tc->x == MAX_12BIT)
77d570e9efSDmitry Torokhov 		tc->x = 0;
7850b6f1f4SKwangwoo Lee 
79d570e9efSDmitry Torokhov 	if (likely(tc->x && tc->z1)) {
80deec586dSH. Nikolaus Schaller 		/* compute touch resistance using equation #1 */
81d570e9efSDmitry Torokhov 		rt = tc->z2 - tc->z1;
82d570e9efSDmitry Torokhov 		rt *= tc->x;
83d570e9efSDmitry Torokhov 		rt *= tsc->x_plate_ohms;
84d570e9efSDmitry Torokhov 		rt /= tc->z1;
8550b6f1f4SKwangwoo Lee 		rt = (rt + 2047) >> 12;
8650b6f1f4SKwangwoo Lee 	}
8750b6f1f4SKwangwoo Lee 
88d570e9efSDmitry Torokhov 	return rt;
89d570e9efSDmitry Torokhov }
90d570e9efSDmitry Torokhov 
91f1443404SH. Nikolaus Schaller bool tsc2007_is_pen_down(struct tsc2007 *ts)
92d570e9efSDmitry Torokhov {
93141586bcSDmitry Torokhov 	/*
94141586bcSDmitry Torokhov 	 * NOTE: We can't rely on the pressure to determine the pen down
95d570e9efSDmitry Torokhov 	 * state, even though this controller has a pressure sensor.
96d570e9efSDmitry Torokhov 	 * The pressure value can fluctuate for quite a while after
97d570e9efSDmitry Torokhov 	 * lifting the pen and in some cases may not even settle at the
98d570e9efSDmitry Torokhov 	 * expected value.
9950b6f1f4SKwangwoo Lee 	 *
10050b6f1f4SKwangwoo Lee 	 * The only safe way to check for the pen up condition is in the
101d570e9efSDmitry Torokhov 	 * work function by reading the pen signal state (it's a GPIO
102d570e9efSDmitry Torokhov 	 * and IRQ). Unfortunately such callback is not always available,
103377dc553SDmitry Torokhov 	 * in that case we assume that the pen is down and expect caller
104377dc553SDmitry Torokhov 	 * to fall back on the pressure reading.
10550b6f1f4SKwangwoo Lee 	 */
106377dc553SDmitry Torokhov 
107377dc553SDmitry Torokhov 	if (!ts->get_pendown_state)
108377dc553SDmitry Torokhov 		return true;
109377dc553SDmitry Torokhov 
11007f9e5cfSDenis Carikli 	return ts->get_pendown_state(&ts->client->dev);
111d570e9efSDmitry Torokhov }
112d570e9efSDmitry Torokhov 
113377dc553SDmitry Torokhov static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
114377dc553SDmitry Torokhov {
115377dc553SDmitry Torokhov 	struct tsc2007 *ts = handle;
116377dc553SDmitry Torokhov 	struct input_dev *input = ts->input;
117377dc553SDmitry Torokhov 	struct ts_event tc;
118377dc553SDmitry Torokhov 	u32 rt;
119d570e9efSDmitry Torokhov 
120377dc553SDmitry Torokhov 	while (!ts->stopped && tsc2007_is_pen_down(ts)) {
121377dc553SDmitry Torokhov 
122377dc553SDmitry Torokhov 		/* pen is down, continue with the measurement */
123f1443404SH. Nikolaus Schaller 
124f1443404SH. Nikolaus Schaller 		mutex_lock(&ts->mlock);
125d570e9efSDmitry Torokhov 		tsc2007_read_values(ts, &tc);
126f1443404SH. Nikolaus Schaller 		mutex_unlock(&ts->mlock);
127d570e9efSDmitry Torokhov 
128deec586dSH. Nikolaus Schaller 		rt = tsc2007_calculate_resistance(ts, &tc);
129d570e9efSDmitry Torokhov 
13007f9e5cfSDenis Carikli 		if (!rt && !ts->get_pendown_state) {
131377dc553SDmitry Torokhov 			/*
132377dc553SDmitry Torokhov 			 * If pressure reported is 0 and we don't have
133377dc553SDmitry Torokhov 			 * callback to check pendown state, we have to
134377dc553SDmitry Torokhov 			 * assume that pen was lifted up.
135377dc553SDmitry Torokhov 			 */
136377dc553SDmitry Torokhov 			break;
137d570e9efSDmitry Torokhov 		}
138d570e9efSDmitry Torokhov 
139377dc553SDmitry Torokhov 		if (rt <= ts->max_rt) {
140377dc553SDmitry Torokhov 			dev_dbg(&ts->client->dev,
141deec586dSH. Nikolaus Schaller 				"DOWN point(%4d,%4d), resistance (%4u)\n",
142377dc553SDmitry Torokhov 				tc.x, tc.y, rt);
14350b6f1f4SKwangwoo Lee 
144db4572ffSH. Nikolaus Schaller 			rt = ts->max_rt - rt;
145db4572ffSH. Nikolaus Schaller 
14650b6f1f4SKwangwoo Lee 			input_report_key(input, BTN_TOUCH, 1);
147d570e9efSDmitry Torokhov 			input_report_abs(input, ABS_X, tc.x);
148d570e9efSDmitry Torokhov 			input_report_abs(input, ABS_Y, tc.y);
14950b6f1f4SKwangwoo Lee 			input_report_abs(input, ABS_PRESSURE, rt);
15050b6f1f4SKwangwoo Lee 
15150b6f1f4SKwangwoo Lee 			input_sync(input);
15250b6f1f4SKwangwoo Lee 
153377dc553SDmitry Torokhov 		} else {
154d570e9efSDmitry Torokhov 			/*
155377dc553SDmitry Torokhov 			 * Sample found inconsistent by debouncing or pressure is
156377dc553SDmitry Torokhov 			 * beyond the maximum. Don't report it to user space,
157377dc553SDmitry Torokhov 			 * repeat at least once more the measurement.
158d570e9efSDmitry Torokhov 			 */
159377dc553SDmitry Torokhov 			dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
160d570e9efSDmitry Torokhov 		}
16150b6f1f4SKwangwoo Lee 
162bbdb38a2SAaron Sierra 		wait_event_timeout(ts->wait, ts->stopped, ts->poll_period);
16350b6f1f4SKwangwoo Lee 	}
16450b6f1f4SKwangwoo Lee 
165377dc553SDmitry Torokhov 	dev_dbg(&ts->client->dev, "UP\n");
166377dc553SDmitry Torokhov 
167377dc553SDmitry Torokhov 	input_report_key(input, BTN_TOUCH, 0);
168377dc553SDmitry Torokhov 	input_report_abs(input, ABS_PRESSURE, 0);
169377dc553SDmitry Torokhov 	input_sync(input);
170377dc553SDmitry Torokhov 
171377dc553SDmitry Torokhov 	if (ts->clear_penirq)
172377dc553SDmitry Torokhov 		ts->clear_penirq();
173377dc553SDmitry Torokhov 
174377dc553SDmitry Torokhov 	return IRQ_HANDLED;
175377dc553SDmitry Torokhov }
176377dc553SDmitry Torokhov 
177377dc553SDmitry Torokhov static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
17850b6f1f4SKwangwoo Lee {
17950b6f1f4SKwangwoo Lee 	struct tsc2007 *ts = handle;
18050b6f1f4SKwangwoo Lee 
18107f9e5cfSDenis Carikli 	if (tsc2007_is_pen_down(ts))
182377dc553SDmitry Torokhov 		return IRQ_WAKE_THREAD;
18350b6f1f4SKwangwoo Lee 
18450b6f1f4SKwangwoo Lee 	if (ts->clear_penirq)
18550b6f1f4SKwangwoo Lee 		ts->clear_penirq();
18650b6f1f4SKwangwoo Lee 
18750b6f1f4SKwangwoo Lee 	return IRQ_HANDLED;
18850b6f1f4SKwangwoo Lee }
18950b6f1f4SKwangwoo Lee 
190d3654d7eSDmitry Torokhov static void tsc2007_stop(struct tsc2007 *ts)
191141586bcSDmitry Torokhov {
192377dc553SDmitry Torokhov 	ts->stopped = true;
193377dc553SDmitry Torokhov 	mb();
194377dc553SDmitry Torokhov 	wake_up(&ts->wait);
195d3654d7eSDmitry Torokhov 
196d3654d7eSDmitry Torokhov 	disable_irq(ts->irq);
197d3654d7eSDmitry Torokhov }
198d3654d7eSDmitry Torokhov 
199d3654d7eSDmitry Torokhov static int tsc2007_open(struct input_dev *input_dev)
200d3654d7eSDmitry Torokhov {
201d3654d7eSDmitry Torokhov 	struct tsc2007 *ts = input_get_drvdata(input_dev);
202d3654d7eSDmitry Torokhov 	int err;
203d3654d7eSDmitry Torokhov 
204d3654d7eSDmitry Torokhov 	ts->stopped = false;
205d3654d7eSDmitry Torokhov 	mb();
206d3654d7eSDmitry Torokhov 
207d3654d7eSDmitry Torokhov 	enable_irq(ts->irq);
208d3654d7eSDmitry Torokhov 
209d3654d7eSDmitry Torokhov 	/* Prepare for touch readings - power down ADC and enable PENIRQ */
210d3654d7eSDmitry Torokhov 	err = tsc2007_xfer(ts, PWRDOWN);
211d3654d7eSDmitry Torokhov 	if (err < 0) {
212d3654d7eSDmitry Torokhov 		tsc2007_stop(ts);
213d3654d7eSDmitry Torokhov 		return err;
214d3654d7eSDmitry Torokhov 	}
215d3654d7eSDmitry Torokhov 
216d3654d7eSDmitry Torokhov 	return 0;
217d3654d7eSDmitry Torokhov }
218d3654d7eSDmitry Torokhov 
219d3654d7eSDmitry Torokhov static void tsc2007_close(struct input_dev *input_dev)
220d3654d7eSDmitry Torokhov {
221d3654d7eSDmitry Torokhov 	struct tsc2007 *ts = input_get_drvdata(input_dev);
222d3654d7eSDmitry Torokhov 
223d3654d7eSDmitry Torokhov 	tsc2007_stop(ts);
224141586bcSDmitry Torokhov }
225141586bcSDmitry Torokhov 
22607f9e5cfSDenis Carikli #ifdef CONFIG_OF
22707f9e5cfSDenis Carikli static int tsc2007_get_pendown_state_gpio(struct device *dev)
22850b6f1f4SKwangwoo Lee {
22907f9e5cfSDenis Carikli 	struct i2c_client *client = to_i2c_client(dev);
23007f9e5cfSDenis Carikli 	struct tsc2007 *ts = i2c_get_clientdata(client);
23150b6f1f4SKwangwoo Lee 
23207f9e5cfSDenis Carikli 	return !gpio_get_value(ts->gpio);
23307f9e5cfSDenis Carikli }
23407f9e5cfSDenis Carikli 
23507f9e5cfSDenis Carikli static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
23607f9e5cfSDenis Carikli {
23707f9e5cfSDenis Carikli 	struct device_node *np = client->dev.of_node;
23807f9e5cfSDenis Carikli 	u32 val32;
23907f9e5cfSDenis Carikli 	u64 val64;
24007f9e5cfSDenis Carikli 
24107f9e5cfSDenis Carikli 	if (!np) {
24207f9e5cfSDenis Carikli 		dev_err(&client->dev, "missing device tree data\n");
24350b6f1f4SKwangwoo Lee 		return -EINVAL;
24450b6f1f4SKwangwoo Lee 	}
24550b6f1f4SKwangwoo Lee 
24607f9e5cfSDenis Carikli 	if (!of_property_read_u32(np, "ti,max-rt", &val32))
24707f9e5cfSDenis Carikli 		ts->max_rt = val32;
24807f9e5cfSDenis Carikli 	else
24907f9e5cfSDenis Carikli 		ts->max_rt = MAX_12BIT;
25050b6f1f4SKwangwoo Lee 
25107f9e5cfSDenis Carikli 	if (!of_property_read_u32(np, "ti,fuzzx", &val32))
25207f9e5cfSDenis Carikli 		ts->fuzzx = val32;
25307f9e5cfSDenis Carikli 
25407f9e5cfSDenis Carikli 	if (!of_property_read_u32(np, "ti,fuzzy", &val32))
25507f9e5cfSDenis Carikli 		ts->fuzzy = val32;
25607f9e5cfSDenis Carikli 
25707f9e5cfSDenis Carikli 	if (!of_property_read_u32(np, "ti,fuzzz", &val32))
25807f9e5cfSDenis Carikli 		ts->fuzzz = val32;
25907f9e5cfSDenis Carikli 
26007f9e5cfSDenis Carikli 	if (!of_property_read_u64(np, "ti,poll-period", &val64))
261bbdb38a2SAaron Sierra 		ts->poll_period = msecs_to_jiffies(val64);
26207f9e5cfSDenis Carikli 	else
263bbdb38a2SAaron Sierra 		ts->poll_period = msecs_to_jiffies(1);
26407f9e5cfSDenis Carikli 
26507f9e5cfSDenis Carikli 	if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
26607f9e5cfSDenis Carikli 		ts->x_plate_ohms = val32;
26707f9e5cfSDenis Carikli 	} else {
26807f9e5cfSDenis Carikli 		dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
26907f9e5cfSDenis Carikli 		return -EINVAL;
27050b6f1f4SKwangwoo Lee 	}
27150b6f1f4SKwangwoo Lee 
27207f9e5cfSDenis Carikli 	ts->gpio = of_get_gpio(np, 0);
27307f9e5cfSDenis Carikli 	if (gpio_is_valid(ts->gpio))
27407f9e5cfSDenis Carikli 		ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
27507f9e5cfSDenis Carikli 	else
27607f9e5cfSDenis Carikli 		dev_warn(&client->dev,
27707f9e5cfSDenis Carikli 			 "GPIO not specified in DT (of_get_gpio returned %d)\n",
27807f9e5cfSDenis Carikli 			 ts->gpio);
27950b6f1f4SKwangwoo Lee 
28007f9e5cfSDenis Carikli 	return 0;
28107f9e5cfSDenis Carikli }
28207f9e5cfSDenis Carikli #else
28307f9e5cfSDenis Carikli static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
28407f9e5cfSDenis Carikli {
28507f9e5cfSDenis Carikli 	dev_err(&client->dev, "platform data is required!\n");
28607f9e5cfSDenis Carikli 	return -EINVAL;
28707f9e5cfSDenis Carikli }
28807f9e5cfSDenis Carikli #endif
28907f9e5cfSDenis Carikli 
29007f9e5cfSDenis Carikli static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts,
29107f9e5cfSDenis Carikli 			      const struct tsc2007_platform_data *pdata,
29207f9e5cfSDenis Carikli 			      const struct i2c_device_id *id)
29307f9e5cfSDenis Carikli {
29450b6f1f4SKwangwoo Lee 	ts->model             = pdata->model;
29550b6f1f4SKwangwoo Lee 	ts->x_plate_ohms      = pdata->x_plate_ohms;
29684005eb5SThierry Reding 	ts->max_rt            = pdata->max_rt ? : MAX_12BIT;
297bbdb38a2SAaron Sierra 	ts->poll_period       = msecs_to_jiffies(pdata->poll_period ? : 1);
29850b6f1f4SKwangwoo Lee 	ts->get_pendown_state = pdata->get_pendown_state;
29950b6f1f4SKwangwoo Lee 	ts->clear_penirq      = pdata->clear_penirq;
30007f9e5cfSDenis Carikli 	ts->fuzzx             = pdata->fuzzx;
30107f9e5cfSDenis Carikli 	ts->fuzzy             = pdata->fuzzy;
30207f9e5cfSDenis Carikli 	ts->fuzzz             = pdata->fuzzz;
30350b6f1f4SKwangwoo Lee 
304341deefeSPhilip Rakity 	if (pdata->x_plate_ohms == 0) {
305341deefeSPhilip Rakity 		dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
30607f9e5cfSDenis Carikli 		return -EINVAL;
307341deefeSPhilip Rakity 	}
308341deefeSPhilip Rakity 
30907f9e5cfSDenis Carikli 	return 0;
31007f9e5cfSDenis Carikli }
31107f9e5cfSDenis Carikli 
312fd91a5f0SDmitry Torokhov static void tsc2007_call_exit_platform_hw(void *data)
313fd91a5f0SDmitry Torokhov {
314fd91a5f0SDmitry Torokhov 	struct device *dev = data;
315fd91a5f0SDmitry Torokhov 	const struct tsc2007_platform_data *pdata = dev_get_platdata(dev);
316fd91a5f0SDmitry Torokhov 
317fd91a5f0SDmitry Torokhov 	pdata->exit_platform_hw();
318fd91a5f0SDmitry Torokhov }
319fd91a5f0SDmitry Torokhov 
32007f9e5cfSDenis Carikli static int tsc2007_probe(struct i2c_client *client,
32107f9e5cfSDenis Carikli 			 const struct i2c_device_id *id)
32207f9e5cfSDenis Carikli {
323f1443404SH. Nikolaus Schaller 	const struct tsc2007_platform_data *pdata =
324f1443404SH. Nikolaus Schaller 		dev_get_platdata(&client->dev);
32507f9e5cfSDenis Carikli 	struct tsc2007 *ts;
32607f9e5cfSDenis Carikli 	struct input_dev *input_dev;
32707f9e5cfSDenis Carikli 	int err;
32807f9e5cfSDenis Carikli 
32907f9e5cfSDenis Carikli 	if (!i2c_check_functionality(client->adapter,
33007f9e5cfSDenis Carikli 				     I2C_FUNC_SMBUS_READ_WORD_DATA))
33107f9e5cfSDenis Carikli 		return -EIO;
33207f9e5cfSDenis Carikli 
33307f9e5cfSDenis Carikli 	ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
33407f9e5cfSDenis Carikli 	if (!ts)
33507f9e5cfSDenis Carikli 		return -ENOMEM;
33607f9e5cfSDenis Carikli 
33707f9e5cfSDenis Carikli 	if (pdata)
33807f9e5cfSDenis Carikli 		err = tsc2007_probe_pdev(client, ts, pdata, id);
33907f9e5cfSDenis Carikli 	else
34007f9e5cfSDenis Carikli 		err = tsc2007_probe_dt(client, ts);
34107f9e5cfSDenis Carikli 	if (err)
34207f9e5cfSDenis Carikli 		return err;
34307f9e5cfSDenis Carikli 
344fd91a5f0SDmitry Torokhov 	input_dev = devm_input_allocate_device(&client->dev);
345fd91a5f0SDmitry Torokhov 	if (!input_dev)
346fd91a5f0SDmitry Torokhov 		return -ENOMEM;
34707f9e5cfSDenis Carikli 
34807f9e5cfSDenis Carikli 	i2c_set_clientdata(client, ts);
34907f9e5cfSDenis Carikli 
35007f9e5cfSDenis Carikli 	ts->client = client;
35107f9e5cfSDenis Carikli 	ts->irq = client->irq;
35207f9e5cfSDenis Carikli 	ts->input = input_dev;
353f1443404SH. Nikolaus Schaller 
35407f9e5cfSDenis Carikli 	init_waitqueue_head(&ts->wait);
355f1443404SH. Nikolaus Schaller 	mutex_init(&ts->mlock);
35607f9e5cfSDenis Carikli 
3574e8718a1SKay Sievers 	snprintf(ts->phys, sizeof(ts->phys),
3584e8718a1SKay Sievers 		 "%s/input0", dev_name(&client->dev));
35950b6f1f4SKwangwoo Lee 
36050b6f1f4SKwangwoo Lee 	input_dev->name = "TSC2007 Touchscreen";
36150b6f1f4SKwangwoo Lee 	input_dev->phys = ts->phys;
36250b6f1f4SKwangwoo Lee 	input_dev->id.bustype = BUS_I2C;
36350b6f1f4SKwangwoo Lee 
364d3654d7eSDmitry Torokhov 	input_dev->open = tsc2007_open;
365d3654d7eSDmitry Torokhov 	input_dev->close = tsc2007_close;
366d3654d7eSDmitry Torokhov 
367d3654d7eSDmitry Torokhov 	input_set_drvdata(input_dev, ts);
368d3654d7eSDmitry Torokhov 
369c61ebe83SDmitry Torokhov 	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
37050b6f1f4SKwangwoo Lee 
37107f9e5cfSDenis Carikli 	input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
37207f9e5cfSDenis Carikli 	input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
373891e376bSThierry Reding 	input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
37407f9e5cfSDenis Carikli 			     ts->fuzzz, 0);
37550b6f1f4SKwangwoo Lee 
376fd91a5f0SDmitry Torokhov 	if (pdata) {
377fd91a5f0SDmitry Torokhov 		if (pdata->exit_platform_hw) {
378fd91a5f0SDmitry Torokhov 			err = devm_add_action(&client->dev,
379fd91a5f0SDmitry Torokhov 					      tsc2007_call_exit_platform_hw,
380fd91a5f0SDmitry Torokhov 					      &client->dev);
381fd91a5f0SDmitry Torokhov 			if (err) {
382fd91a5f0SDmitry Torokhov 				dev_err(&client->dev,
383fd91a5f0SDmitry Torokhov 					"Failed to register exit_platform_hw action, %d\n",
384fd91a5f0SDmitry Torokhov 					err);
385fd91a5f0SDmitry Torokhov 				return err;
386fd91a5f0SDmitry Torokhov 			}
387fd91a5f0SDmitry Torokhov 		}
38875fba3b0SRichard Röjfors 
389fd91a5f0SDmitry Torokhov 		if (pdata->init_platform_hw)
390fd91a5f0SDmitry Torokhov 			pdata->init_platform_hw();
391fd91a5f0SDmitry Torokhov 	}
392fd91a5f0SDmitry Torokhov 
393fd91a5f0SDmitry Torokhov 	err = devm_request_threaded_irq(&client->dev, ts->irq,
394fd91a5f0SDmitry Torokhov 					tsc2007_hard_irq, tsc2007_soft_irq,
395fd91a5f0SDmitry Torokhov 					IRQF_ONESHOT,
396fd91a5f0SDmitry Torokhov 					client->dev.driver->name, ts);
397fd91a5f0SDmitry Torokhov 	if (err) {
398fd91a5f0SDmitry Torokhov 		dev_err(&client->dev, "Failed to request irq %d: %d\n",
399fd91a5f0SDmitry Torokhov 			ts->irq, err);
400fd91a5f0SDmitry Torokhov 		return err;
40150b6f1f4SKwangwoo Lee 	}
40250b6f1f4SKwangwoo Lee 
403d3654d7eSDmitry Torokhov 	tsc2007_stop(ts);
404cf5f439bSRichard Röjfors 
405934df231SH. Nikolaus Schaller 	/* power down the chip (TSC2007_SETUP does not ACK on I2C) */
406934df231SH. Nikolaus Schaller 	err = tsc2007_xfer(ts, PWRDOWN);
407934df231SH. Nikolaus Schaller 	if (err < 0) {
408934df231SH. Nikolaus Schaller 		dev_err(&client->dev,
409934df231SH. Nikolaus Schaller 			"Failed to setup chip: %d\n", err);
410f1443404SH. Nikolaus Schaller 		return err;	/* chip does not respond */
411934df231SH. Nikolaus Schaller 	}
412934df231SH. Nikolaus Schaller 
41350b6f1f4SKwangwoo Lee 	err = input_register_device(input_dev);
414fd91a5f0SDmitry Torokhov 	if (err) {
415fd91a5f0SDmitry Torokhov 		dev_err(&client->dev,
416fd91a5f0SDmitry Torokhov 			"Failed to register input device: %d\n", err);
41750b6f1f4SKwangwoo Lee 		return err;
41850b6f1f4SKwangwoo Lee 	}
41950b6f1f4SKwangwoo Lee 
420f1443404SH. Nikolaus Schaller 	err =  tsc2007_iio_configure(ts);
421f1443404SH. Nikolaus Schaller 	if (err) {
422f1443404SH. Nikolaus Schaller 		dev_err(&client->dev,
423f1443404SH. Nikolaus Schaller 			"Failed to register with IIO: %d\n", err);
424f1443404SH. Nikolaus Schaller 		return err;
425f1443404SH. Nikolaus Schaller 	}
426f1443404SH. Nikolaus Schaller 
42750b6f1f4SKwangwoo Lee 	return 0;
42850b6f1f4SKwangwoo Lee }
42950b6f1f4SKwangwoo Lee 
430ce7b39a1SMárton Németh static const struct i2c_device_id tsc2007_idtable[] = {
43150b6f1f4SKwangwoo Lee 	{ "tsc2007", 0 },
43250b6f1f4SKwangwoo Lee 	{ }
43350b6f1f4SKwangwoo Lee };
43450b6f1f4SKwangwoo Lee 
43550b6f1f4SKwangwoo Lee MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
43650b6f1f4SKwangwoo Lee 
43707f9e5cfSDenis Carikli #ifdef CONFIG_OF
43807f9e5cfSDenis Carikli static const struct of_device_id tsc2007_of_match[] = {
43907f9e5cfSDenis Carikli 	{ .compatible = "ti,tsc2007" },
44007f9e5cfSDenis Carikli 	{ /* sentinel */ }
44107f9e5cfSDenis Carikli };
44207f9e5cfSDenis Carikli MODULE_DEVICE_TABLE(of, tsc2007_of_match);
44307f9e5cfSDenis Carikli #endif
44407f9e5cfSDenis Carikli 
44550b6f1f4SKwangwoo Lee static struct i2c_driver tsc2007_driver = {
44650b6f1f4SKwangwoo Lee 	.driver = {
44707f9e5cfSDenis Carikli 		.name	= "tsc2007",
44807f9e5cfSDenis Carikli 		.of_match_table = of_match_ptr(tsc2007_of_match),
44950b6f1f4SKwangwoo Lee 	},
45050b6f1f4SKwangwoo Lee 	.id_table	= tsc2007_idtable,
45150b6f1f4SKwangwoo Lee 	.probe		= tsc2007_probe,
45250b6f1f4SKwangwoo Lee };
45350b6f1f4SKwangwoo Lee 
4541b92c1cfSAxel Lin module_i2c_driver(tsc2007_driver);
45550b6f1f4SKwangwoo Lee 
45650b6f1f4SKwangwoo Lee MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
45750b6f1f4SKwangwoo Lee MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
45850b6f1f4SKwangwoo Lee MODULE_LICENSE("GPL");
459