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path: root/drivers/input/touchscreen/wm831x-ts.c
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Diffstat (limited to 'drivers/input/touchscreen/wm831x-ts.c')
-rw-r--r--drivers/input/touchscreen/wm831x-ts.c421
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wm831x-ts.c b/drivers/input/touchscreen/wm831x-ts.c
new file mode 100644
index 000000000000..9175d49d2546
--- /dev/null
+++ b/drivers/input/touchscreen/wm831x-ts.c
@@ -0,0 +1,421 @@
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
64struct 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
74static 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
88static 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
160static 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
191static 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
207static 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
236static __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
372err_pd_irq:
373 free_irq(wm831x_ts->pd_irq, wm831x_ts);
374err_data_irq:
375 free_irq(wm831x_ts->data_irq, wm831x_ts);
376err_alloc:
377 input_free_device(input_dev);
378 kfree(wm831x_ts);
379
380 return error;
381}
382
383static __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
396static 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
405static int __init wm831x_ts_init(void)
406{
407 return platform_driver_register(&wm831x_ts_driver);
408}
409module_init(wm831x_ts_init);
410
411static void __exit wm831x_ts_exit(void)
412{
413 platform_driver_unregister(&wm831x_ts_driver);
414}
415module_exit(wm831x_ts_exit);
416
417/* Module information */
418MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
419MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
420MODULE_LICENSE("GPL");
421MODULE_ALIAS("platform:wm831x-touch");
generated by cgit v1.2.2 (git 2.25.0) at 2025-03-14 11:18:06 -0400