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path: root/drivers/input/touchscreen/tps6507x-ts.c
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Diffstat (limited to 'drivers/input/touchscreen/tps6507x-ts.c')
-rw-r--r--drivers/input/touchscreen/tps6507x-ts.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/tps6507x-ts.c b/drivers/input/touchscreen/tps6507x-ts.c
new file mode 100644
index 000000000000..5de80a1a730b
--- /dev/null
+++ b/drivers/input/touchscreen/tps6507x-ts.c
@@ -0,0 +1,400 @@
1/*
2 * drivers/input/touchscreen/tps6507x_ts.c
3 *
4 * Touchscreen driver for the tps6507x chip.
5 *
6 * Copyright (c) 2009 RidgeRun (todd.fischer@ridgerun.com)
7 *
8 * Credits:
9 *
10 * Using code from tsc2007, MtekVision Co., Ltd.
11 *
12 * For licencing details see kernel-base/COPYING
13 *
14 * TPS65070, TPS65073, TPS650731, and TPS650732 support
15 * 10 bit touch screen interface.
16 */
17
18#include <linux/module.h>
19#include <linux/workqueue.h>
20#include <linux/slab.h>
21#include <linux/input.h>
22#include <linux/platform_device.h>
23#include <linux/mfd/tps6507x.h>
24#include <linux/input/tps6507x-ts.h>
25#include <linux/delay.h>
26
27#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
28#define TPS_DEFAULT_MIN_PRESSURE 0x30
29#define MAX_10BIT ((1 << 10) - 1)
30
31#define TPS6507X_ADCONFIG_CONVERT_TS (TPS6507X_ADCONFIG_AD_ENABLE | \
32 TPS6507X_ADCONFIG_START_CONVERSION | \
33 TPS6507X_ADCONFIG_INPUT_REAL_TSC)
34#define TPS6507X_ADCONFIG_POWER_DOWN_TS (TPS6507X_ADCONFIG_INPUT_REAL_TSC)
35
36struct ts_event {
37 u16 x;
38 u16 y;
39 u16 pressure;
40};
41
42struct tps6507x_ts {
43 struct input_dev *input_dev;
44 struct device *dev;
45 char phys[32];
46 struct workqueue_struct *wq;
47 struct delayed_work work;
48 unsigned polling; /* polling is active */
49 struct ts_event tc;
50 struct tps6507x_dev *mfd;
51 u16 model;
52 unsigned pendown;
53 int irq;
54 void (*clear_penirq)(void);
55 unsigned long poll_period; /* ms */
56 u16 min_pressure;
57 int vref; /* non-zero to leave vref on */
58};
59
60static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data)
61{
62 int err;
63
64 err = tsc->mfd->read_dev(tsc->mfd, reg, 1, data);
65
66 if (err)
67 return err;
68
69 return 0;
70}
71
72static int tps6507x_write_u8(struct tps6507x_ts *tsc, u8 reg, u8 data)
73{
74 return tsc->mfd->write_dev(tsc->mfd, reg, 1, &data);
75}
76
77static s32 tps6507x_adc_conversion(struct tps6507x_ts *tsc,
78 u8 tsc_mode, u16 *value)
79{
80 s32 ret;
81 u8 adc_status;
82 u8 result;
83
84 /* Route input signal to A/D converter */
85
86 ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE, tsc_mode);
87 if (ret) {
88 dev_err(tsc->dev, "TSC mode read failed\n");
89 goto err;
90 }
91
92 /* Start A/D conversion */
93
94 ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
95 TPS6507X_ADCONFIG_CONVERT_TS);
96 if (ret) {
97 dev_err(tsc->dev, "ADC config write failed\n");
98 return ret;
99 }
100
101 do {
102 ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADCONFIG,
103 &adc_status);
104 if (ret) {
105 dev_err(tsc->dev, "ADC config read failed\n");
106 goto err;
107 }
108 } while (adc_status & TPS6507X_ADCONFIG_START_CONVERSION);
109
110 ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_2, &result);
111 if (ret) {
112 dev_err(tsc->dev, "ADC result 2 read failed\n");
113 goto err;
114 }
115
116 *value = (result & TPS6507X_REG_ADRESULT_2_MASK) << 8;
117
118 ret = tps6507x_read_u8(tsc, TPS6507X_REG_ADRESULT_1, &result);
119 if (ret) {
120 dev_err(tsc->dev, "ADC result 1 read failed\n");
121 goto err;
122 }
123
124 *value |= result;
125
126 dev_dbg(tsc->dev, "TSC channel %d = 0x%X\n", tsc_mode, *value);
127
128err:
129 return ret;
130}
131
132/* Need to call tps6507x_adc_standby() after using A/D converter for the
133 * touch screen interrupt to work properly.
134 */
135
136static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
137{
138 s32 ret;
139 s32 loops = 0;
140 u8 val;
141
142 ret = tps6507x_write_u8(tsc, TPS6507X_REG_ADCONFIG,
143 TPS6507X_ADCONFIG_INPUT_TSC);
144 if (ret)
145 return ret;
146
147 ret = tps6507x_write_u8(tsc, TPS6507X_REG_TSCMODE,
148 TPS6507X_TSCMODE_STANDBY);
149 if (ret)
150 return ret;
151
152 ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
153 if (ret)
154 return ret;
155
156 while (val & TPS6507X_REG_TSC_INT) {
157 mdelay(10);
158 ret = tps6507x_read_u8(tsc, TPS6507X_REG_INT, &val);
159 if (ret)
160 return ret;
161 loops++;
162 }
163
164 return ret;
165}
166
167static void tps6507x_ts_handler(struct work_struct *work)
168{
169 struct tps6507x_ts *tsc = container_of(work,
170 struct tps6507x_ts, work.work);
171 struct input_dev *input_dev = tsc->input_dev;
172 int pendown;
173 int schd;
174 int poll = 0;
175 s32 ret;
176
177 ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
178 &tsc->tc.pressure);
179 if (ret)
180 goto done;
181
182 pendown = tsc->tc.pressure > tsc->min_pressure;
183
184 if (unlikely(!pendown && tsc->pendown)) {
185 dev_dbg(tsc->dev, "UP\n");
186 input_report_key(input_dev, BTN_TOUCH, 0);
187 input_report_abs(input_dev, ABS_PRESSURE, 0);
188 input_sync(input_dev);
189 tsc->pendown = 0;
190 }
191
192 if (pendown) {
193
194 if (!tsc->pendown) {
195 dev_dbg(tsc->dev, "DOWN\n");
196 input_report_key(input_dev, BTN_TOUCH, 1);
197 } else
198 dev_dbg(tsc->dev, "still down\n");
199
200 ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_X_POSITION,
201 &tsc->tc.x);
202 if (ret)
203 goto done;
204
205 ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_Y_POSITION,
206 &tsc->tc.y);
207 if (ret)
208 goto done;
209
210 input_report_abs(input_dev, ABS_X, tsc->tc.x);
211 input_report_abs(input_dev, ABS_Y, tsc->tc.y);
212 input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
213 input_sync(input_dev);
214 tsc->pendown = 1;
215 poll = 1;
216 }
217
218done:
219 /* always poll if not using interrupts */
220 poll = 1;
221
222 if (poll) {
223 schd = queue_delayed_work(tsc->wq, &tsc->work,
224 tsc->poll_period * HZ / 1000);
225 if (schd)
226 tsc->polling = 1;
227 else {
228 tsc->polling = 0;
229 dev_err(tsc->dev, "re-schedule failed");
230 }
231 } else
232 tsc->polling = 0;
233
234 ret = tps6507x_adc_standby(tsc);
235}
236
237static int tps6507x_ts_probe(struct platform_device *pdev)
238{
239 int error;
240 struct tps6507x_ts *tsc;
241 struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
242 struct touchscreen_init_data *init_data;
243 struct input_dev *input_dev;
244 struct tps6507x_board *tps_board;
245 int schd;
246
247 /**
248 * tps_board points to pmic related constants
249 * coming from the board-evm file.
250 */
251
252 tps_board = (struct tps6507x_board *)tps6507x_dev->dev->platform_data;
253
254 if (!tps_board) {
255 dev_err(tps6507x_dev->dev,
256 "Could not find tps6507x platform data\n");
257 return -EIO;
258 }
259
260 /**
261 * init_data points to array of regulator_init structures
262 * coming from the board-evm file.
263 */
264
265 init_data = tps_board->tps6507x_ts_init_data;
266
267 tsc = kzalloc(sizeof(struct tps6507x_ts), GFP_KERNEL);
268 if (!tsc) {
269 dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
270 error = -ENOMEM;
271 goto err0;
272 }
273
274 tps6507x_dev->ts = tsc;
275 tsc->mfd = tps6507x_dev;
276 tsc->dev = tps6507x_dev->dev;
277 input_dev = input_allocate_device();
278 if (!input_dev) {
279 dev_err(tsc->dev, "Failed to allocate input device.\n");
280 error = -ENOMEM;
281 goto err1;
282 }
283
284 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
285 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
286
287 input_set_abs_params(input_dev, ABS_X, 0, MAX_10BIT, 0, 0);
288 input_set_abs_params(input_dev, ABS_Y, 0, MAX_10BIT, 0, 0);
289 input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);
290
291 input_dev->name = "TPS6507x Touchscreen";
292 input_dev->id.bustype = BUS_I2C;
293 input_dev->dev.parent = tsc->dev;
294
295 snprintf(tsc->phys, sizeof(tsc->phys),
296 "%s/input0", dev_name(tsc->dev));
297 input_dev->phys = tsc->phys;
298
299 dev_dbg(tsc->dev, "device: %s\n", input_dev->phys);
300
301 input_set_drvdata(input_dev, tsc);
302
303 tsc->input_dev = input_dev;
304
305 INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler);
306 tsc->wq = create_workqueue("TPS6507x Touchscreen");
307
308 if (init_data) {
309 tsc->poll_period = init_data->poll_period;
310 tsc->vref = init_data->vref;
311 tsc->min_pressure = init_data->min_pressure;
312 input_dev->id.vendor = init_data->vendor;
313 input_dev->id.product = init_data->product;
314 input_dev->id.version = init_data->version;
315 } else {
316 tsc->poll_period = TSC_DEFAULT_POLL_PERIOD;
317 tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE;
318 }
319
320 error = tps6507x_adc_standby(tsc);
321 if (error)
322 goto err2;
323
324 error = input_register_device(input_dev);
325 if (error)
326 goto err2;
327
328 schd = queue_delayed_work(tsc->wq, &tsc->work,
329 tsc->poll_period * HZ / 1000);
330
331 if (schd)
332 tsc->polling = 1;
333 else {
334 tsc->polling = 0;
335 dev_err(tsc->dev, "schedule failed");
336 goto err2;
337 }
338
339 return 0;
340
341err2:
342 cancel_delayed_work(&tsc->work);
343 flush_workqueue(tsc->wq);
344 destroy_workqueue(tsc->wq);
345 tsc->wq = 0;
346 input_free_device(input_dev);
347err1:
348 kfree(tsc);
349 tps6507x_dev->ts = NULL;
350err0:
351 return error;
352}
353
354static int __devexit tps6507x_ts_remove(struct platform_device *pdev)
355{
356 struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
357 struct tps6507x_ts *tsc = tps6507x_dev->ts;
358 struct input_dev *input_dev = tsc->input_dev;
359
360 if (!tsc)
361 return 0;
362
363 cancel_delayed_work(&tsc->work);
364 flush_workqueue(tsc->wq);
365 destroy_workqueue(tsc->wq);
366 tsc->wq = 0;
367
368 input_free_device(input_dev);
369
370 tps6507x_dev->ts = NULL;
371 kfree(tsc);
372
373 return 0;
374}
375
376static struct platform_driver tps6507x_ts_driver = {
377 .driver = {
378 .name = "tps6507x-ts",
379 .owner = THIS_MODULE,
380 },
381 .probe = tps6507x_ts_probe,
382 .remove = __devexit_p(tps6507x_ts_remove),
383};
384
385static int __init tps6507x_ts_init(void)
386{
387 return platform_driver_register(&tps6507x_ts_driver);
388}
389module_init(tps6507x_ts_init);
390
391static void __exit tps6507x_ts_exit(void)
392{
393 platform_driver_unregister(&tps6507x_ts_driver);
394}
395module_exit(tps6507x_ts_exit);
396
397MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
398MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
399MODULE_LICENSE("GPL v2");
400MODULE_ALIAS("platform:tps6507x-tsc");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 11:05:31 -0500