Merge branch 'packaging' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek...
[pandora-kernel.git] / drivers / input / touchscreen / tps6507x-ts.c
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
36 struct ts_event {
37         u16     x;
38         u16     y;
39         u16     pressure;
40 };
41
42 struct 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
60 static 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
72 static 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
77 static 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
128 err:
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
136 static 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
167 static 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
218 done:
219         /* always poll if not using interrupts */
220         poll = 1;
221
222         if (poll) {
223                 schd = queue_delayed_work(tsc->wq, &tsc->work,
224                                           msecs_to_jiffies(tsc->poll_period));
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
237 static 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                                   msecs_to_jiffies(tsc->poll_period));
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         platform_set_drvdata(pdev, tps6507x_dev);
339
340         return 0;
341
342 err2:
343         cancel_delayed_work_sync(&tsc->work);
344         destroy_workqueue(tsc->wq);
345         input_free_device(input_dev);
346 err1:
347         kfree(tsc);
348         tps6507x_dev->ts = NULL;
349 err0:
350         return error;
351 }
352
353 static int __devexit tps6507x_ts_remove(struct platform_device *pdev)
354 {
355         struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
356         struct tps6507x_ts *tsc = tps6507x_dev->ts;
357         struct input_dev *input_dev = tsc->input_dev;
358
359         cancel_delayed_work_sync(&tsc->work);
360         destroy_workqueue(tsc->wq);
361
362         input_unregister_device(input_dev);
363
364         tps6507x_dev->ts = NULL;
365         kfree(tsc);
366
367         return 0;
368 }
369
370 static struct platform_driver tps6507x_ts_driver = {
371         .driver = {
372                 .name = "tps6507x-ts",
373                 .owner = THIS_MODULE,
374         },
375         .probe = tps6507x_ts_probe,
376         .remove = __devexit_p(tps6507x_ts_remove),
377 };
378
379 static int __init tps6507x_ts_init(void)
380 {
381         return platform_driver_register(&tps6507x_ts_driver);
382 }
383 module_init(tps6507x_ts_init);
384
385 static void __exit tps6507x_ts_exit(void)
386 {
387         platform_driver_unregister(&tps6507x_ts_driver);
388 }
389 module_exit(tps6507x_ts_exit);
390
391 MODULE_AUTHOR("Todd Fischer <todd.fischer@ridgerun.com>");
392 MODULE_DESCRIPTION("TPS6507x - TouchScreen driver");
393 MODULE_LICENSE("GPL v2");
394 MODULE_ALIAS("platform:tps6507x-tsc");