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1/* STMicroelectronics STMPE811 Touchscreen Driver
2 *
3 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/interrupt.h>
17#include <linux/init.h>
18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/input.h>
21#include <linux/slab.h>
22#include <linux/delay.h>
23#include <linux/i2c.h>
24#include <linux/workqueue.h>
25
26#include <linux/mfd/stmpe.h>
27
28/* Register layouts and functionalities are identical on all stmpexxx variants
29 * with touchscreen controller
30 */
31#define STMPE_REG_INT_STA 0x0B
32#define STMPE_REG_ADC_CTRL1 0x20
33#define STMPE_REG_ADC_CTRL2 0x21
34#define STMPE_REG_TSC_CTRL 0x40
35#define STMPE_REG_TSC_CFG 0x41
36#define STMPE_REG_FIFO_TH 0x4A
37#define STMPE_REG_FIFO_STA 0x4B
38#define STMPE_REG_FIFO_SIZE 0x4C
39#define STMPE_REG_TSC_DATA_XYZ 0x52
40#define STMPE_REG_TSC_FRACTION_Z 0x56
41#define STMPE_REG_TSC_I_DRIVE 0x58
42
43#define OP_MOD_XYZ 0
44
45#define STMPE_TSC_CTRL_TSC_EN (1<<0)
46
47#define STMPE_FIFO_STA_RESET (1<<0)
48
49#define STMPE_IRQ_TOUCH_DET 0
50
51#define SAMPLE_TIME(x) ((x & 0xf) << 4)
52#define MOD_12B(x) ((x & 0x1) << 3)
53#define REF_SEL(x) ((x & 0x1) << 1)
54#define ADC_FREQ(x) (x & 0x3)
55#define AVE_CTRL(x) ((x & 0x3) << 6)
56#define DET_DELAY(x) ((x & 0x7) << 3)
57#define SETTLING(x) (x & 0x7)
58#define FRACTION_Z(x) (x & 0x7)
59#define I_DRIVE(x) (x & 0x1)
60#define OP_MODE(x) ((x & 0x7) << 1)
61
62#define STMPE_TS_NAME "stmpe-ts"
63#define XY_MASK 0xfff
64
65struct stmpe_touch {
66 struct stmpe *stmpe;
67 struct input_dev *idev;
68 struct delayed_work work;
69 struct device *dev;
70 u8 sample_time;
71 u8 mod_12b;
72 u8 ref_sel;
73 u8 adc_freq;
74 u8 ave_ctrl;
75 u8 touch_det_delay;
76 u8 settling;
77 u8 fraction_z;
78 u8 i_drive;
79};
80
81static int __stmpe_reset_fifo(struct stmpe *stmpe)
82{
83 int ret;
84
85 ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
86 STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
87 if (ret)
88 return ret;
89
90 return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
91 STMPE_FIFO_STA_RESET, 0);
92}
93
94static void stmpe_work(struct work_struct *work)
95{
96 int int_sta;
97 u32 timeout = 40;
98
99 struct stmpe_touch *ts =
100 container_of(work, struct stmpe_touch, work.work);
101
102 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
103
104 /*
105 * touch_det sometimes get desasserted or just get stuck. This appears
106 * to be a silicon bug, We still have to clearify this with the
107 * manufacture. As a workaround We release the key anyway if the
108 * touch_det keeps coming in after 4ms, while the FIFO contains no value
109 * during the whole time.
110 */
111 while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
112 timeout--;
113 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
114 udelay(100);
115 }
116
117 /* reset the FIFO before we report release event */
118 __stmpe_reset_fifo(ts->stmpe);
119
120 input_report_abs(ts->idev, ABS_PRESSURE, 0);
121 input_sync(ts->idev);
122}
123
124static irqreturn_t stmpe_ts_handler(int irq, void *data)
125{
126 u8 data_set[4];
127 int x, y, z;
128 struct stmpe_touch *ts = data;
129
130 /*
131 * Cancel scheduled polling for release if we have new value
132 * available. Wait if the polling is already running.
133 */
134 cancel_delayed_work_sync(&ts->work);
135
136 /*
137 * The FIFO sometimes just crashes and stops generating interrupts. This
138 * appears to be a silicon bug. We still have to clearify this with
139 * the manufacture. As a workaround we disable the TSC while we are
140 * collecting data and flush the FIFO after reading
141 */
142 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
143 STMPE_TSC_CTRL_TSC_EN, 0);
144
145 stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
146
147 x = (data_set[0] << 4) | (data_set[1] >> 4);
148 y = ((data_set[1] & 0xf) << 8) | data_set[2];
149 z = data_set[3];
150
151 input_report_abs(ts->idev, ABS_X, x);
152 input_report_abs(ts->idev, ABS_Y, y);
153 input_report_abs(ts->idev, ABS_PRESSURE, z);
154 input_sync(ts->idev);
155
156 /* flush the FIFO after we have read out our values. */
157 __stmpe_reset_fifo(ts->stmpe);
158
159 /* reenable the tsc */
160 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
161 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
162
163 /* start polling for touch_det to detect release */
164 schedule_delayed_work(&ts->work, HZ / 50);
165
166 return IRQ_HANDLED;
167}
168
169static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
170{
171 int ret;
172 u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
173 struct stmpe *stmpe = ts->stmpe;
174 struct device *dev = ts->dev;
175
176 ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
177 if (ret) {
178 dev_err(dev, "Could not enable clock for ADC and TS\n");
179 return ret;
180 }
181
182 adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
183 REF_SEL(ts->ref_sel);
184 adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
185
186 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
187 adc_ctrl1_mask, adc_ctrl1);
188 if (ret) {
189 dev_err(dev, "Could not setup ADC\n");
190 return ret;
191 }
192
193 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
194 ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
195 if (ret) {
196 dev_err(dev, "Could not setup ADC\n");
197 return ret;
198 }
199
200 tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
201 SETTLING(ts->settling);
202 tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
203
204 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
205 if (ret) {
206 dev_err(dev, "Could not config touch\n");
207 return ret;
208 }
209
210 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
211 FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
212 if (ret) {
213 dev_err(dev, "Could not config touch\n");
214 return ret;
215 }
216
217 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
218 I_DRIVE(0xff), I_DRIVE(ts->i_drive));
219 if (ret) {
220 dev_err(dev, "Could not config touch\n");
221 return ret;
222 }
223
224 /* set FIFO to 1 for single point reading */
225 ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
226 if (ret) {
227 dev_err(dev, "Could not set FIFO\n");
228 return ret;
229 }
230
231 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
232 OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
233 if (ret) {
234 dev_err(dev, "Could not set mode\n");
235 return ret;
236 }
237
238 return 0;
239}
240
241static int stmpe_ts_open(struct input_dev *dev)
242{
243 struct stmpe_touch *ts = input_get_drvdata(dev);
244 int ret = 0;
245
246 ret = __stmpe_reset_fifo(ts->stmpe);
247 if (ret)
248 return ret;
249
250 return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
251 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
252}
253
254static void stmpe_ts_close(struct input_dev *dev)
255{
256 struct stmpe_touch *ts = input_get_drvdata(dev);
257
258 cancel_delayed_work_sync(&ts->work);
259
260 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
261 STMPE_TSC_CTRL_TSC_EN, 0);
262}
263
264static int __devinit stmpe_input_probe(struct platform_device *pdev)
265{
266 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
267 struct stmpe_platform_data *pdata = stmpe->pdata;
268 struct stmpe_touch *ts;
269 struct input_dev *idev;
270 struct stmpe_ts_platform_data *ts_pdata = NULL;
271 int ret;
272 int ts_irq;
273
274 ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
275 if (ts_irq < 0)
276 return ts_irq;
277
278 ts = kzalloc(sizeof(*ts), GFP_KERNEL);
279 if (!ts) {
280 ret = -ENOMEM;
281 goto err_out;
282 }
283
284 idev = input_allocate_device();
285 if (!idev) {
286 ret = -ENOMEM;
287 goto err_free_ts;
288 }
289
290 platform_set_drvdata(pdev, ts);
291 ts->stmpe = stmpe;
292 ts->idev = idev;
293 ts->dev = &pdev->dev;
294
295 if (pdata)
296 ts_pdata = pdata->ts;
297
298 if (ts_pdata) {
299 ts->sample_time = ts_pdata->sample_time;
300 ts->mod_12b = ts_pdata->mod_12b;
301 ts->ref_sel = ts_pdata->ref_sel;
302 ts->adc_freq = ts_pdata->adc_freq;
303 ts->ave_ctrl = ts_pdata->ave_ctrl;
304 ts->touch_det_delay = ts_pdata->touch_det_delay;
305 ts->settling = ts_pdata->settling;
306 ts->fraction_z = ts_pdata->fraction_z;
307 ts->i_drive = ts_pdata->i_drive;
308 }
309
310 INIT_DELAYED_WORK(&ts->work, stmpe_work);
311
312 ret = request_threaded_irq(ts_irq, NULL, stmpe_ts_handler,
313 IRQF_ONESHOT, STMPE_TS_NAME, ts);
314 if (ret) {
315 dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
316 goto err_free_input;
317 }
318
319 ret = stmpe_init_hw(ts);
320 if (ret)
321 goto err_free_irq;
322
323 idev->name = STMPE_TS_NAME;
324 idev->id.bustype = BUS_I2C;
325 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
326 idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
327
328 idev->open = stmpe_ts_open;
329 idev->close = stmpe_ts_close;
330
331 input_set_drvdata(idev, ts);
332
333 input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
334 input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
335 input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
336
337 ret = input_register_device(idev);
338 if (ret) {
339 dev_err(&pdev->dev, "Could not register input device\n");
340 goto err_free_irq;
341 }
342
343 return ret;
344
345err_free_irq:
346 free_irq(ts_irq, ts);
347err_free_input:
348 input_free_device(idev);
349 platform_set_drvdata(pdev, NULL);
350err_free_ts:
351 kfree(ts);
352err_out:
353 return ret;
354}
355
356static int __devexit stmpe_ts_remove(struct platform_device *pdev)
357{
358 struct stmpe_touch *ts = platform_get_drvdata(pdev);
359 unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
360
361 stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
362
363 free_irq(ts_irq, ts);
364
365 platform_set_drvdata(pdev, NULL);
366
367 input_unregister_device(ts->idev);
368
369 kfree(ts);
370
371 return 0;
372}
373
374static struct platform_driver stmpe_ts_driver = {
375 .driver = {
376 .name = STMPE_TS_NAME,
377 .owner = THIS_MODULE,
378 },
379 .probe = stmpe_input_probe,
380 .remove = __devexit_p(stmpe_ts_remove),
381};
382
383static int __init stmpe_ts_init(void)
384{
385 return platform_driver_register(&stmpe_ts_driver);
386}
387
388module_init(stmpe_ts_init);
389
390static void __exit stmpe_ts_exit(void)
391{
392 platform_driver_unregister(&stmpe_ts_driver);
393}
394
395module_exit(stmpe_ts_exit);
396
397MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
398MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
399MODULE_LICENSE("GPL");
400MODULE_ALIAS("platform:" STMPE_TS_NAME);
1/*
2 * STMicroelectronics STMPE811 Touchscreen Driver
3 *
4 * (C) 2010 Luotao Fu <l.fu@pengutronix.de>
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <linux/interrupt.h>
18#include <linux/device.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/input.h>
22#include <linux/slab.h>
23#include <linux/delay.h>
24#include <linux/i2c.h>
25#include <linux/workqueue.h>
26
27#include <linux/mfd/stmpe.h>
28
29/* Register layouts and functionalities are identical on all stmpexxx variants
30 * with touchscreen controller
31 */
32#define STMPE_REG_INT_STA 0x0B
33#define STMPE_REG_ADC_CTRL1 0x20
34#define STMPE_REG_ADC_CTRL2 0x21
35#define STMPE_REG_TSC_CTRL 0x40
36#define STMPE_REG_TSC_CFG 0x41
37#define STMPE_REG_FIFO_TH 0x4A
38#define STMPE_REG_FIFO_STA 0x4B
39#define STMPE_REG_FIFO_SIZE 0x4C
40#define STMPE_REG_TSC_DATA_XYZ 0x52
41#define STMPE_REG_TSC_FRACTION_Z 0x56
42#define STMPE_REG_TSC_I_DRIVE 0x58
43
44#define OP_MOD_XYZ 0
45
46#define STMPE_TSC_CTRL_TSC_EN (1<<0)
47
48#define STMPE_FIFO_STA_RESET (1<<0)
49
50#define STMPE_IRQ_TOUCH_DET 0
51
52#define SAMPLE_TIME(x) ((x & 0xf) << 4)
53#define MOD_12B(x) ((x & 0x1) << 3)
54#define REF_SEL(x) ((x & 0x1) << 1)
55#define ADC_FREQ(x) (x & 0x3)
56#define AVE_CTRL(x) ((x & 0x3) << 6)
57#define DET_DELAY(x) ((x & 0x7) << 3)
58#define SETTLING(x) (x & 0x7)
59#define FRACTION_Z(x) (x & 0x7)
60#define I_DRIVE(x) (x & 0x1)
61#define OP_MODE(x) ((x & 0x7) << 1)
62
63#define STMPE_TS_NAME "stmpe-ts"
64#define XY_MASK 0xfff
65
66/**
67 * struct stmpe_touch - stmpe811 touch screen controller state
68 * @stmpe: pointer back to STMPE MFD container
69 * @idev: registered input device
70 * @work: a work item used to scan the device
71 * @dev: a pointer back to the MFD cell struct device*
72 * @sample_time: ADC converstion time in number of clock.
73 * (0 -> 36 clocks, 1 -> 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks,
74 * 4 -> 80 clocks, 5 -> 96 clocks, 6 -> 144 clocks),
75 * recommended is 4.
76 * @mod_12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
77 * @ref_sel: ADC reference source
78 * (0 -> internal reference, 1 -> external reference)
79 * @adc_freq: ADC Clock speed
80 * (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
81 * @ave_ctrl: Sample average control
82 * (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 samples, 3 -> 8 samples)
83 * @touch_det_delay: Touch detect interrupt delay
84 * (0 -> 10 us, 1 -> 50 us, 2 -> 100 us, 3 -> 500 us,
85 * 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms)
86 * recommended is 3
87 * @settling: Panel driver settling time
88 * (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 -> 1 ms,
89 * 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms)
90 * recommended is 2
91 * @fraction_z: Length of the fractional part in z
92 * (fraction_z ([0..7]) = Count of the fractional part)
93 * recommended is 7
94 * @i_drive: current limit value of the touchscreen drivers
95 * (0 -> 20 mA typical 35 mA max, 1 -> 50 mA typical 80 mA max)
96 */
97struct stmpe_touch {
98 struct stmpe *stmpe;
99 struct input_dev *idev;
100 struct delayed_work work;
101 struct device *dev;
102 u8 sample_time;
103 u8 mod_12b;
104 u8 ref_sel;
105 u8 adc_freq;
106 u8 ave_ctrl;
107 u8 touch_det_delay;
108 u8 settling;
109 u8 fraction_z;
110 u8 i_drive;
111};
112
113static int __stmpe_reset_fifo(struct stmpe *stmpe)
114{
115 int ret;
116
117 ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
118 STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
119 if (ret)
120 return ret;
121
122 return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
123 STMPE_FIFO_STA_RESET, 0);
124}
125
126static void stmpe_work(struct work_struct *work)
127{
128 int int_sta;
129 u32 timeout = 40;
130
131 struct stmpe_touch *ts =
132 container_of(work, struct stmpe_touch, work.work);
133
134 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
135
136 /*
137 * touch_det sometimes get desasserted or just get stuck. This appears
138 * to be a silicon bug, We still have to clearify this with the
139 * manufacture. As a workaround We release the key anyway if the
140 * touch_det keeps coming in after 4ms, while the FIFO contains no value
141 * during the whole time.
142 */
143 while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
144 timeout--;
145 int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
146 udelay(100);
147 }
148
149 /* reset the FIFO before we report release event */
150 __stmpe_reset_fifo(ts->stmpe);
151
152 input_report_abs(ts->idev, ABS_PRESSURE, 0);
153 input_report_key(ts->idev, BTN_TOUCH, 0);
154 input_sync(ts->idev);
155}
156
157static irqreturn_t stmpe_ts_handler(int irq, void *data)
158{
159 u8 data_set[4];
160 int x, y, z;
161 struct stmpe_touch *ts = data;
162
163 /*
164 * Cancel scheduled polling for release if we have new value
165 * available. Wait if the polling is already running.
166 */
167 cancel_delayed_work_sync(&ts->work);
168
169 /*
170 * The FIFO sometimes just crashes and stops generating interrupts. This
171 * appears to be a silicon bug. We still have to clearify this with
172 * the manufacture. As a workaround we disable the TSC while we are
173 * collecting data and flush the FIFO after reading
174 */
175 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
176 STMPE_TSC_CTRL_TSC_EN, 0);
177
178 stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
179
180 x = (data_set[0] << 4) | (data_set[1] >> 4);
181 y = ((data_set[1] & 0xf) << 8) | data_set[2];
182 z = data_set[3];
183
184 input_report_abs(ts->idev, ABS_X, x);
185 input_report_abs(ts->idev, ABS_Y, y);
186 input_report_abs(ts->idev, ABS_PRESSURE, z);
187 input_report_key(ts->idev, BTN_TOUCH, 1);
188 input_sync(ts->idev);
189
190 /* flush the FIFO after we have read out our values. */
191 __stmpe_reset_fifo(ts->stmpe);
192
193 /* reenable the tsc */
194 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
195 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
196
197 /* start polling for touch_det to detect release */
198 schedule_delayed_work(&ts->work, msecs_to_jiffies(50));
199
200 return IRQ_HANDLED;
201}
202
203static int stmpe_init_hw(struct stmpe_touch *ts)
204{
205 int ret;
206 u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
207 struct stmpe *stmpe = ts->stmpe;
208 struct device *dev = ts->dev;
209
210 ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
211 if (ret) {
212 dev_err(dev, "Could not enable clock for ADC and TS\n");
213 return ret;
214 }
215
216 adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
217 REF_SEL(ts->ref_sel);
218 adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
219
220 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
221 adc_ctrl1_mask, adc_ctrl1);
222 if (ret) {
223 dev_err(dev, "Could not setup ADC\n");
224 return ret;
225 }
226
227 ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
228 ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
229 if (ret) {
230 dev_err(dev, "Could not setup ADC\n");
231 return ret;
232 }
233
234 tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
235 SETTLING(ts->settling);
236 tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
237
238 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
239 if (ret) {
240 dev_err(dev, "Could not config touch\n");
241 return ret;
242 }
243
244 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
245 FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
246 if (ret) {
247 dev_err(dev, "Could not config touch\n");
248 return ret;
249 }
250
251 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
252 I_DRIVE(0xff), I_DRIVE(ts->i_drive));
253 if (ret) {
254 dev_err(dev, "Could not config touch\n");
255 return ret;
256 }
257
258 /* set FIFO to 1 for single point reading */
259 ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
260 if (ret) {
261 dev_err(dev, "Could not set FIFO\n");
262 return ret;
263 }
264
265 ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
266 OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
267 if (ret) {
268 dev_err(dev, "Could not set mode\n");
269 return ret;
270 }
271
272 return 0;
273}
274
275static int stmpe_ts_open(struct input_dev *dev)
276{
277 struct stmpe_touch *ts = input_get_drvdata(dev);
278 int ret = 0;
279
280 ret = __stmpe_reset_fifo(ts->stmpe);
281 if (ret)
282 return ret;
283
284 return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
285 STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
286}
287
288static void stmpe_ts_close(struct input_dev *dev)
289{
290 struct stmpe_touch *ts = input_get_drvdata(dev);
291
292 cancel_delayed_work_sync(&ts->work);
293
294 stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
295 STMPE_TSC_CTRL_TSC_EN, 0);
296}
297
298static void stmpe_ts_get_platform_info(struct platform_device *pdev,
299 struct stmpe_touch *ts)
300{
301 struct device_node *np = pdev->dev.of_node;
302 u32 val;
303
304 if (np) {
305 if (!of_property_read_u32(np, "st,sample-time", &val))
306 ts->sample_time = val;
307 if (!of_property_read_u32(np, "st,mod-12b", &val))
308 ts->mod_12b = val;
309 if (!of_property_read_u32(np, "st,ref-sel", &val))
310 ts->ref_sel = val;
311 if (!of_property_read_u32(np, "st,adc-freq", &val))
312 ts->adc_freq = val;
313 if (!of_property_read_u32(np, "st,ave-ctrl", &val))
314 ts->ave_ctrl = val;
315 if (!of_property_read_u32(np, "st,touch-det-delay", &val))
316 ts->touch_det_delay = val;
317 if (!of_property_read_u32(np, "st,settling", &val))
318 ts->settling = val;
319 if (!of_property_read_u32(np, "st,fraction-z", &val))
320 ts->fraction_z = val;
321 if (!of_property_read_u32(np, "st,i-drive", &val))
322 ts->i_drive = val;
323 }
324}
325
326static int stmpe_input_probe(struct platform_device *pdev)
327{
328 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
329 struct stmpe_touch *ts;
330 struct input_dev *idev;
331 int error;
332 int ts_irq;
333
334 ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
335 if (ts_irq < 0)
336 return ts_irq;
337
338 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
339 if (!ts)
340 return -ENOMEM;
341
342 idev = devm_input_allocate_device(&pdev->dev);
343 if (!idev)
344 return -ENOMEM;
345
346 platform_set_drvdata(pdev, ts);
347 ts->stmpe = stmpe;
348 ts->idev = idev;
349 ts->dev = &pdev->dev;
350
351 stmpe_ts_get_platform_info(pdev, ts);
352
353 INIT_DELAYED_WORK(&ts->work, stmpe_work);
354
355 error = devm_request_threaded_irq(&pdev->dev, ts_irq,
356 NULL, stmpe_ts_handler,
357 IRQF_ONESHOT, STMPE_TS_NAME, ts);
358 if (error) {
359 dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
360 return error;
361 }
362
363 error = stmpe_init_hw(ts);
364 if (error)
365 return error;
366
367 idev->name = STMPE_TS_NAME;
368 idev->phys = STMPE_TS_NAME"/input0";
369 idev->id.bustype = BUS_I2C;
370
371 idev->open = stmpe_ts_open;
372 idev->close = stmpe_ts_close;
373
374 input_set_drvdata(idev, ts);
375
376 input_set_capability(idev, EV_KEY, BTN_TOUCH);
377 input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
378 input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
379 input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
380
381 error = input_register_device(idev);
382 if (error) {
383 dev_err(&pdev->dev, "Could not register input device\n");
384 return error;
385 }
386
387 return 0;
388}
389
390static int stmpe_ts_remove(struct platform_device *pdev)
391{
392 struct stmpe_touch *ts = platform_get_drvdata(pdev);
393
394 stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
395
396 return 0;
397}
398
399static struct platform_driver stmpe_ts_driver = {
400 .driver = {
401 .name = STMPE_TS_NAME,
402 },
403 .probe = stmpe_input_probe,
404 .remove = stmpe_ts_remove,
405};
406module_platform_driver(stmpe_ts_driver);
407
408static const struct of_device_id stmpe_ts_ids[] = {
409 { .compatible = "st,stmpe-ts", },
410 { },
411};
412MODULE_DEVICE_TABLE(of, stmpe_ts_ids);
413
414MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
415MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
416MODULE_LICENSE("GPL");