Input: wm831x-ts - move BTN_TOUCH reporting to data transfer
[pandora-kernel.git] / drivers / input / touchscreen / wm831x-ts.c
1 /*
2  * Touchscreen driver for WM831x PMICs
3  *
4  * Copyright 2011 Wolfson Microelectronics plc.
5  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/string.h>
18 #include <linux/pm.h>
19 #include <linux/input.h>
20 #include <linux/interrupt.h>
21 #include <linux/io.h>
22 #include <linux/mfd/wm831x/core.h>
23 #include <linux/mfd/wm831x/irq.h>
24 #include <linux/mfd/wm831x/pdata.h>
25 #include <linux/platform_device.h>
26 #include <linux/slab.h>
27 #include <linux/types.h>
28
29 /*
30  * R16424 (0x4028) - Touch Control 1
31  */
32 #define WM831X_TCH_ENA                          0x8000  /* TCH_ENA */
33 #define WM831X_TCH_CVT_ENA                      0x4000  /* TCH_CVT_ENA */
34 #define WM831X_TCH_SLPENA                       0x1000  /* TCH_SLPENA */
35 #define WM831X_TCH_Z_ENA                        0x0400  /* TCH_Z_ENA */
36 #define WM831X_TCH_Y_ENA                        0x0200  /* TCH_Y_ENA */
37 #define WM831X_TCH_X_ENA                        0x0100  /* TCH_X_ENA */
38 #define WM831X_TCH_DELAY_MASK                   0x00E0  /* TCH_DELAY - [7:5] */
39 #define WM831X_TCH_DELAY_SHIFT                       5  /* TCH_DELAY - [7:5] */
40 #define WM831X_TCH_DELAY_WIDTH                       3  /* TCH_DELAY - [7:5] */
41 #define WM831X_TCH_RATE_MASK                    0x001F  /* TCH_RATE - [4:0] */
42 #define WM831X_TCH_RATE_SHIFT                        0  /* TCH_RATE - [4:0] */
43 #define WM831X_TCH_RATE_WIDTH                        5  /* TCH_RATE - [4:0] */
44
45 /*
46  * R16425 (0x4029) - Touch Control 2
47  */
48 #define WM831X_TCH_PD_WK                        0x2000  /* TCH_PD_WK */
49 #define WM831X_TCH_5WIRE                        0x1000  /* TCH_5WIRE */
50 #define WM831X_TCH_PDONLY                       0x0800  /* TCH_PDONLY */
51 #define WM831X_TCH_ISEL                         0x0100  /* TCH_ISEL */
52 #define WM831X_TCH_RPU_MASK                     0x000F  /* TCH_RPU - [3:0] */
53 #define WM831X_TCH_RPU_SHIFT                         0  /* TCH_RPU - [3:0] */
54 #define WM831X_TCH_RPU_WIDTH                         4  /* TCH_RPU - [3:0] */
55
56 /*
57  * R16426-8 (0x402A-C) - Touch Data X/Y/X
58  */
59 #define WM831X_TCH_PD                           0x8000  /* TCH_PD1 */
60 #define WM831X_TCH_DATA_MASK                    0x0FFF  /* TCH_DATA - [11:0] */
61 #define WM831X_TCH_DATA_SHIFT                        0  /* TCH_DATA - [11:0] */
62 #define WM831X_TCH_DATA_WIDTH                       12  /* TCH_DATA - [11:0] */
63
64 struct wm831x_ts {
65         struct input_dev *input_dev;
66         struct wm831x *wm831x;
67         unsigned int data_irq;
68         unsigned int pd_irq;
69         bool pressure;
70         bool pen_down;
71         struct work_struct pd_data_work;
72 };
73
74 static void wm831x_pd_data_work(struct work_struct *work)
75 {
76         struct wm831x_ts *wm831x_ts =
77                 container_of(work, struct wm831x_ts, pd_data_work);
78
79         if (wm831x_ts->pen_down) {
80                 enable_irq(wm831x_ts->data_irq);
81                 dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
82         } else {
83                 enable_irq(wm831x_ts->pd_irq);
84                 dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
85         }
86 }
87
88 static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
89 {
90         struct wm831x_ts *wm831x_ts = irq_data;
91         struct wm831x *wm831x = wm831x_ts->wm831x;
92         static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
93         u16 data[3];
94         int count;
95         int i, ret;
96
97         if (wm831x_ts->pressure)
98                 count = 3;
99         else
100                 count = 2;
101
102         wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
103                         WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
104
105         ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
106                                data);
107         if (ret != 0) {
108                 dev_err(wm831x->dev, "Failed to read touch data: %d\n",
109                         ret);
110                 return IRQ_NONE;
111         }
112
113         /*
114          * We get a pen down reading on every reading, report pen up if any
115          * individual reading does so.
116          */
117         wm831x_ts->pen_down = true;
118         for (i = 0; i < count; i++) {
119                 if (!(data[i] & WM831X_TCH_PD)) {
120                         wm831x_ts->pen_down = false;
121                         continue;
122                 }
123                 input_report_abs(wm831x_ts->input_dev, data_types[i],
124                                  data[i] & WM831X_TCH_DATA_MASK);
125         }
126
127         if (!wm831x_ts->pen_down) {
128                 /* Switch from data to pen down */
129                 dev_dbg(wm831x->dev, "IRQ DATA->PD\n");
130
131                 disable_irq_nosync(wm831x_ts->data_irq);
132
133                 /* Don't need data any more */
134                 wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
135                                 WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
136                                 WM831X_TCH_Z_ENA, 0);
137
138                 /* Flush any final samples that arrived while reading */
139                 wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
140                                 WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
141
142                 wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);
143
144                 if (wm831x_ts->pressure)
145                         input_report_abs(wm831x_ts->input_dev,
146                                          ABS_PRESSURE, 0);
147
148                 input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);
149
150                 schedule_work(&wm831x_ts->pd_data_work);
151         } else {
152                 input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
153         }
154
155         input_sync(wm831x_ts->input_dev);
156
157         return IRQ_HANDLED;
158 }
159
160 static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
161 {
162         struct wm831x_ts *wm831x_ts = irq_data;
163         struct wm831x *wm831x = wm831x_ts->wm831x;
164         int ena = 0;
165
166         if (wm831x_ts->pen_down)
167                 return IRQ_HANDLED;
168
169         disable_irq_nosync(wm831x_ts->pd_irq);
170
171         /* Start collecting data */
172         if (wm831x_ts->pressure)
173                 ena |= WM831X_TCH_Z_ENA;
174
175         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
176                         WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA,
177                         WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena);
178
179         wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
180                         WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);
181
182         wm831x_ts->pen_down = true;
183
184         /* Switch from pen down to data */
185         dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
186         schedule_work(&wm831x_ts->pd_data_work);
187
188         return IRQ_HANDLED;
189 }
190
191 static int wm831x_ts_input_open(struct input_dev *idev)
192 {
193         struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
194         struct wm831x *wm831x = wm831x_ts->wm831x;
195
196         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
197                         WM831X_TCH_ENA | WM831X_TCH_CVT_ENA |
198                         WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
199                         WM831X_TCH_Z_ENA, WM831X_TCH_ENA);
200
201         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
202                         WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);
203
204         return 0;
205 }
206
207 static void wm831x_ts_input_close(struct input_dev *idev)
208 {
209         struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
210         struct wm831x *wm831x = wm831x_ts->wm831x;
211
212         /* Shut the controller down, disabling all other functionality too */
213         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
214                         WM831X_TCH_ENA | WM831X_TCH_X_ENA |
215                         WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0);
216
217         /* Make sure any pending IRQs are done, the above will prevent
218          * new ones firing.
219          */
220         synchronize_irq(wm831x_ts->data_irq);
221         synchronize_irq(wm831x_ts->pd_irq);
222
223         /* Make sure the IRQ completion work is quiesced */
224         flush_work_sync(&wm831x_ts->pd_data_work);
225
226         /* If we ended up with the pen down then make sure we revert back
227          * to pen detection state for the next time we start up.
228          */
229         if (wm831x_ts->pen_down) {
230                 disable_irq(wm831x_ts->data_irq);
231                 enable_irq(wm831x_ts->pd_irq);
232                 wm831x_ts->pen_down = false;
233         }
234 }
235
236 static __devinit int wm831x_ts_probe(struct platform_device *pdev)
237 {
238         struct wm831x_ts *wm831x_ts;
239         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
240         struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
241         struct wm831x_touch_pdata *pdata = NULL;
242         struct input_dev *input_dev;
243         int error, irqf;
244
245         if (core_pdata)
246                 pdata = core_pdata->touch;
247
248         wm831x_ts = kzalloc(sizeof(struct wm831x_ts), GFP_KERNEL);
249         input_dev = input_allocate_device();
250         if (!wm831x_ts || !input_dev) {
251                 error = -ENOMEM;
252                 goto err_alloc;
253         }
254
255         wm831x_ts->wm831x = wm831x;
256         wm831x_ts->input_dev = input_dev;
257         INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work);
258
259         /*
260          * If we have a direct IRQ use it, otherwise use the interrupt
261          * from the WM831x IRQ controller.
262          */
263         if (pdata && pdata->data_irq)
264                 wm831x_ts->data_irq = pdata->data_irq;
265         else
266                 wm831x_ts->data_irq = platform_get_irq_byname(pdev, "TCHDATA");
267
268         if (pdata && pdata->pd_irq)
269                 wm831x_ts->pd_irq = pdata->pd_irq;
270         else
271                 wm831x_ts->pd_irq = platform_get_irq_byname(pdev, "TCHPD");
272
273         if (pdata)
274                 wm831x_ts->pressure = pdata->pressure;
275         else
276                 wm831x_ts->pressure = true;
277
278         /* Five wire touchscreens can't report pressure */
279         if (pdata && pdata->fivewire) {
280                 wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
281                                 WM831X_TCH_5WIRE, WM831X_TCH_5WIRE);
282
283                 /* Pressure measurements are not possible for five wire mode */
284                 WARN_ON(pdata->pressure && pdata->fivewire);
285                 wm831x_ts->pressure = false;
286         } else {
287                 wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
288                                 WM831X_TCH_5WIRE, 0);
289         }
290
291         if (pdata) {
292                 switch (pdata->isel) {
293                 default:
294                         dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n",
295                                 pdata->isel);
296                         /* Fall through */
297                 case 200:
298                 case 0:
299                         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
300                                         WM831X_TCH_ISEL, 0);
301                         break;
302                 case 400:
303                         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
304                                         WM831X_TCH_ISEL, WM831X_TCH_ISEL);
305                         break;
306                 }
307         }
308
309         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
310                         WM831X_TCH_PDONLY, 0);
311
312         /* Default to 96 samples/sec */
313         wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
314                         WM831X_TCH_RATE_MASK, 6);
315
316         if (pdata && pdata->data_irqf)
317                 irqf = pdata->data_irqf;
318         else
319                 irqf = IRQF_TRIGGER_HIGH;
320
321         error = request_threaded_irq(wm831x_ts->data_irq,
322                                      NULL, wm831x_ts_data_irq,
323                                      irqf | IRQF_ONESHOT,
324                                      "Touchscreen data", wm831x_ts);
325         if (error) {
326                 dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n",
327                         wm831x_ts->data_irq, error);
328                 goto err_alloc;
329         }
330         disable_irq(wm831x_ts->data_irq);
331
332         if (pdata && pdata->pd_irqf)
333                 irqf = pdata->pd_irqf;
334         else
335                 irqf = IRQF_TRIGGER_HIGH;
336
337         error = request_threaded_irq(wm831x_ts->pd_irq,
338                                      NULL, wm831x_ts_pen_down_irq,
339                                      irqf | IRQF_ONESHOT,
340                                      "Touchscreen pen down", wm831x_ts);
341         if (error) {
342                 dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n",
343                         wm831x_ts->pd_irq, error);
344                 goto err_data_irq;
345         }
346
347         /* set up touch configuration */
348         input_dev->name = "WM831x touchscreen";
349         input_dev->phys = "wm831x";
350         input_dev->open = wm831x_ts_input_open;
351         input_dev->close = wm831x_ts_input_close;
352
353         __set_bit(EV_ABS, input_dev->evbit);
354         __set_bit(EV_KEY, input_dev->evbit);
355         __set_bit(BTN_TOUCH, input_dev->keybit);
356
357         input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0);
358         input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0);
359         if (wm831x_ts->pressure)
360                 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0);
361
362         input_set_drvdata(input_dev, wm831x_ts);
363         input_dev->dev.parent = &pdev->dev;
364
365         error = input_register_device(input_dev);
366         if (error)
367                 goto err_pd_irq;
368
369         platform_set_drvdata(pdev, wm831x_ts);
370         return 0;
371
372 err_pd_irq:
373         free_irq(wm831x_ts->pd_irq, wm831x_ts);
374 err_data_irq:
375         free_irq(wm831x_ts->data_irq, wm831x_ts);
376 err_alloc:
377         input_free_device(input_dev);
378         kfree(wm831x_ts);
379
380         return error;
381 }
382
383 static __devexit int wm831x_ts_remove(struct platform_device *pdev)
384 {
385         struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);
386
387         free_irq(wm831x_ts->pd_irq, wm831x_ts);
388         free_irq(wm831x_ts->data_irq, wm831x_ts);
389         input_unregister_device(wm831x_ts->input_dev);
390         kfree(wm831x_ts);
391
392         platform_set_drvdata(pdev, NULL);
393         return 0;
394 }
395
396 static struct platform_driver wm831x_ts_driver = {
397         .driver = {
398                 .name = "wm831x-touch",
399                 .owner = THIS_MODULE,
400         },
401         .probe = wm831x_ts_probe,
402         .remove = __devexit_p(wm831x_ts_remove),
403 };
404
405 static int __init wm831x_ts_init(void)
406 {
407         return platform_driver_register(&wm831x_ts_driver);
408 }
409 module_init(wm831x_ts_init);
410
411 static void __exit wm831x_ts_exit(void)
412 {
413         platform_driver_unregister(&wm831x_ts_driver);
414 }
415 module_exit(wm831x_ts_exit);
416
417 /* Module information */
418 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
419 MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
420 MODULE_LICENSE("GPL");
421 MODULE_ALIAS("platform:wm831x-touch");