1 /*
2 * Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc.
3 *
4 * Description: AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver
5 * Based on: ads7846.c
6 *
7 * Bugs: Enter bugs at http://blackfin.uclinux.org/
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, see the file COPYING, or write
21 * to the Free Software Foundation, Inc.,
22 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 * History:
25 * Copyright (c) 2005 David Brownell
26 * Copyright (c) 2006 Nokia Corporation
27 * Various changes: Imre Deak <imre.deak@nokia.com>
28 *
29 * Using code from:
30 * - corgi_ts.c
31 * Copyright (C) 2004-2005 Richard Purdie
32 * - omap_ts.[hc], ads7846.h, ts_osk.c
33 * Copyright (C) 2002 MontaVista Software
34 * Copyright (C) 2004 Texas Instruments
35 * Copyright (C) 2005 Dirk Behme
36 */
37
38
39 #include <linux/device.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/input.h>
43 #include <linux/interrupt.h>
44 #include <linux/slab.h>
45 #include <linux/spi/spi.h>
46 #include <linux/spi/ad7877.h>
47 #include <asm/irq.h>
48
49 #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
50
51 #define MAX_SPI_FREQ_HZ 20000000
52 #define MAX_12BIT ((1<<12)-1)
53
54 #define AD7877_REG_ZEROS 0
55 #define AD7877_REG_CTRL1 1
56 #define AD7877_REG_CTRL2 2
57 #define AD7877_REG_ALERT 3
58 #define AD7877_REG_AUX1HIGH 4
59 #define AD7877_REG_AUX1LOW 5
60 #define AD7877_REG_BAT1HIGH 6
61 #define AD7877_REG_BAT1LOW 7
62 #define AD7877_REG_BAT2HIGH 8
63 #define AD7877_REG_BAT2LOW 9
64 #define AD7877_REG_TEMP1HIGH 10
65 #define AD7877_REG_TEMP1LOW 11
66 #define AD7877_REG_SEQ0 12
67 #define AD7877_REG_SEQ1 13
68 #define AD7877_REG_DAC 14
69 #define AD7877_REG_NONE1 15
70 #define AD7877_REG_EXTWRITE 15
71 #define AD7877_REG_XPLUS 16
72 #define AD7877_REG_YPLUS 17
73 #define AD7877_REG_Z2 18
74 #define AD7877_REG_aux1 19
75 #define AD7877_REG_aux2 20
76 #define AD7877_REG_aux3 21
77 #define AD7877_REG_bat1 22
78 #define AD7877_REG_bat2 23
79 #define AD7877_REG_temp1 24
80 #define AD7877_REG_temp2 25
81 #define AD7877_REG_Z1 26
82 #define AD7877_REG_GPIOCTRL1 27
83 #define AD7877_REG_GPIOCTRL2 28
84 #define AD7877_REG_GPIODATA 29
85 #define AD7877_REG_NONE2 30
86 #define AD7877_REG_NONE3 31
87
88 #define AD7877_SEQ_YPLUS_BIT (1<<11)
89 #define AD7877_SEQ_XPLUS_BIT (1<<10)
90 #define AD7877_SEQ_Z2_BIT (1<<9)
91 #define AD7877_SEQ_AUX1_BIT (1<<8)
92 #define AD7877_SEQ_AUX2_BIT (1<<7)
93 #define AD7877_SEQ_AUX3_BIT (1<<6)
94 #define AD7877_SEQ_BAT1_BIT (1<<5)
95 #define AD7877_SEQ_BAT2_BIT (1<<4)
96 #define AD7877_SEQ_TEMP1_BIT (1<<3)
97 #define AD7877_SEQ_TEMP2_BIT (1<<2)
98 #define AD7877_SEQ_Z1_BIT (1<<1)
99
100 enum {
101 AD7877_SEQ_YPOS = 0,
102 AD7877_SEQ_XPOS = 1,
103 AD7877_SEQ_Z2 = 2,
104 AD7877_SEQ_AUX1 = 3,
105 AD7877_SEQ_AUX2 = 4,
106 AD7877_SEQ_AUX3 = 5,
107 AD7877_SEQ_BAT1 = 6,
108 AD7877_SEQ_BAT2 = 7,
109 AD7877_SEQ_TEMP1 = 8,
110 AD7877_SEQ_TEMP2 = 9,
111 AD7877_SEQ_Z1 = 10,
112 AD7877_NR_SENSE = 11,
113 };
114
115 /* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */
116 #define AD7877_DAC_CONF 0x1
117
118 /* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */
119 #define AD7877_EXTW_GPIO_3_CONF 0x1C4
120 #define AD7877_EXTW_GPIO_DATA 0x200
121
122 /* Control REG 2 */
123 #define AD7877_TMR(x) ((x & 0x3) << 0)
124 #define AD7877_REF(x) ((x & 0x1) << 2)
125 #define AD7877_POL(x) ((x & 0x1) << 3)
126 #define AD7877_FCD(x) ((x & 0x3) << 4)
127 #define AD7877_PM(x) ((x & 0x3) << 6)
128 #define AD7877_ACQ(x) ((x & 0x3) << 8)
129 #define AD7877_AVG(x) ((x & 0x3) << 10)
130
131 /* Control REG 1 */
132 #define AD7877_SER (1 << 11) /* non-differential */
133 #define AD7877_DFR (0 << 11) /* differential */
134
135 #define AD7877_MODE_NOC (0) /* Do not convert */
136 #define AD7877_MODE_SCC (1) /* Single channel conversion */
137 #define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */
138 #define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */
139
140 #define AD7877_CHANADD(x) ((x&0xF)<<7)
141 #define AD7877_READADD(x) ((x)<<2)
142 #define AD7877_WRITEADD(x) ((x)<<12)
143
144 #define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \
145 AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \
146 AD7877_READADD(AD7877_REG_ ## x))
147
148 #define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \
149 AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT)
150
151 /*
152 * Non-touchscreen sensors only use single-ended conversions.
153 */
154
155 struct ser_req {
156 u16 reset;
157 u16 ref_on;
158 u16 command;
159 u16 sample;
160 struct spi_message msg;
161 struct spi_transfer xfer[6];
162 };
163
164 struct ad7877 {
165 struct input_dev *input;
166 char phys[32];
167
168 struct spi_device *spi;
169 u16 model;
170 u16 vref_delay_usecs;
171 u16 x_plate_ohms;
172 u16 pressure_max;
173
174 u16 cmd_crtl1;
175 u16 cmd_crtl2;
176 u16 cmd_dummy;
177 u16 dac;
178
179 u8 stopacq_polarity;
180 u8 first_conversion_delay;
181 u8 acquisition_time;
182 u8 averaging;
183 u8 pen_down_acc_interval;
184
185 u16 conversion_data[AD7877_NR_SENSE];
186
187 struct spi_transfer xfer[AD7877_NR_SENSE + 2];
188 struct spi_message msg;
189
190 struct mutex mutex;
191 unsigned disabled:1; /* P: mutex */
192 unsigned gpio3:1; /* P: mutex */
193 unsigned gpio4:1; /* P: mutex */
194
195 spinlock_t lock;
196 struct timer_list timer; /* P: lock */
197 unsigned pending:1; /* P: lock */
198 };
199
200 static int gpio3;
201 module_param(gpio3, int, 0);
202 MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
203
204 /*
205 * ad7877_read/write are only used for initial setup and for sysfs controls.
206 * The main traffic is done using spi_async() in the interrupt handler.
207 */
208
209 static int ad7877_read(struct spi_device *spi, u16 reg)
210 {
211 struct ser_req *req;
212 int status, ret;
213
214 req = kzalloc(sizeof *req, GFP_KERNEL);
215 if (!req)
216 return -ENOMEM;
217
218 spi_message_init(&req->msg);
219
220 req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) |
221 AD7877_READADD(reg));
222 req->xfer[0].tx_buf = &req->command;
223 req->xfer[0].len = 2;
224
225 req->xfer[1].rx_buf = &req->sample;
226 req->xfer[1].len = 2;
227
228 spi_message_add_tail(&req->xfer[0], &req->msg);
229 spi_message_add_tail(&req->xfer[1], &req->msg);
230
231 status = spi_sync(spi, &req->msg);
232 ret = status ? : req->sample;
233
234 kfree(req);
235
236 return ret;
237 }
238
239 static int ad7877_write(struct spi_device *spi, u16 reg, u16 val)
240 {
241 struct ser_req *req;
242 int status;
243
244 req = kzalloc(sizeof *req, GFP_KERNEL);
245 if (!req)
246 return -ENOMEM;
247
248 spi_message_init(&req->msg);
249
250 req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT));
251 req->xfer[0].tx_buf = &req->command;
252 req->xfer[0].len = 2;
253
254 spi_message_add_tail(&req->xfer[0], &req->msg);
255
256 status = spi_sync(spi, &req->msg);
257
258 kfree(req);
259
260 return status;
261 }
262
263 static int ad7877_read_adc(struct spi_device *spi, unsigned command)
264 {
265 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
266 struct ser_req *req;
267 int status;
268 int sample;
269 int i;
270
271 req = kzalloc(sizeof *req, GFP_KERNEL);
272 if (!req)
273 return -ENOMEM;
274
275 spi_message_init(&req->msg);
276
277 /* activate reference, so it has time to settle; */
278 req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) |
279 AD7877_POL(ts->stopacq_polarity) |
280 AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) |
281 AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0);
282
283 req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC;
284
285 req->command = (u16) command;
286
287 req->xfer[0].tx_buf = &req->reset;
288 req->xfer[0].len = 2;
289
290 req->xfer[1].tx_buf = &req->ref_on;
291 req->xfer[1].len = 2;
292 req->xfer[1].delay_usecs = ts->vref_delay_usecs;
293
294 req->xfer[2].tx_buf = &req->command;
295 req->xfer[2].len = 2;
296 req->xfer[2].delay_usecs = ts->vref_delay_usecs;
297
298 req->xfer[3].rx_buf = &req->sample;
299 req->xfer[3].len = 2;
300
301 req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/
302 req->xfer[4].len = 2;
303
304 req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/
305 req->xfer[5].len = 2;
306
307 /* group all the transfers together, so we can't interfere with
308 * reading touchscreen state; disable penirq while sampling
309 */
310 for (i = 0; i < 6; i++)
311 spi_message_add_tail(&req->xfer[i], &req->msg);
312
313 status = spi_sync(spi, &req->msg);
314 sample = req->sample;
315
316 kfree(req);
317
318 return status ? : sample;
319 }
320
321 static void ad7877_rx(struct ad7877 *ts)
322 {
323 struct input_dev *input_dev = ts->input;
324 unsigned Rt;
325 u16 x, y, z1, z2;
326
327 x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT;
328 y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
329 z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT;
330 z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT;
331
332 /*
333 * The samples processed here are already preprocessed by the AD7877.
334 * The preprocessing function consists of an averaging filter.
335 * The combination of 'first conversion delay' and averaging provides a robust solution,
336 * discarding the spurious noise in the signal and keeping only the data of interest.
337 * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.h)
338 * Other user-programmable conversion controls include variable acquisition time,
339 * and first conversion delay. Up to 16 averages can be taken per conversion.
340 */
341
342 if (likely(x && z1)) {
343 /* compute touch pressure resistance using equation #1 */
344 Rt = (z2 - z1) * x * ts->x_plate_ohms;
345 Rt /= z1;
346 Rt = (Rt + 2047) >> 12;
347
348 input_report_abs(input_dev, ABS_X, x);
349 input_report_abs(input_dev, ABS_Y, y);
350 input_report_abs(input_dev, ABS_PRESSURE, Rt);
351 input_sync(input_dev);
352 }
353 }
354
355 static inline void ad7877_ts_event_release(struct ad7877 *ts)
356 {
357 struct input_dev *input_dev = ts->input;
358
359 input_report_abs(input_dev, ABS_PRESSURE, 0);
360 input_sync(input_dev);
361 }
362
363 static void ad7877_timer(unsigned long handle)
364 {
365 struct ad7877 *ts = (void *)handle;
366
367 ad7877_ts_event_release(ts);
368 }
369
370 static irqreturn_t ad7877_irq(int irq, void *handle)
371 {
372 struct ad7877 *ts = handle;
373 unsigned long flags;
374 int status;
375
376 /*
377 * The repeated conversion sequencer controlled by TMR kicked off
378 * too fast. We ignore the last and process the sample sequence
379 * currently in the queue. It can't be older than 9.4ms, and we
380 * need to avoid that ts->msg doesn't get issued twice while in work.
381 */
382
383 spin_lock_irqsave(&ts->lock, flags);
384 if (!ts->pending) {
385 ts->pending = 1;
386
387 status = spi_async(ts->spi, &ts->msg);
388 if (status)
389 dev_err(&ts->spi->dev, "spi_sync --> %d\n", status);
390 }
391 spin_unlock_irqrestore(&ts->lock, flags);
392
393 return IRQ_HANDLED;
394 }
395
396 static void ad7877_callback(void *_ts)
397 {
398 struct ad7877 *ts = _ts;
399
400 spin_lock_irq(&ts->lock);
401
402 ad7877_rx(ts);
403 ts->pending = 0;
404 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
405
406 spin_unlock_irq(&ts->lock);
407 }
408
409 static void ad7877_disable(struct ad7877 *ts)
410 {
411 mutex_lock(&ts->mutex);
412
413 if (!ts->disabled) {
414 ts->disabled = 1;
415 disable_irq(ts->spi->irq);
416
417 /* Wait for spi_async callback */
418 while (ts->pending)
419 msleep(1);
420
421 if (del_timer_sync(&ts->timer))
422 ad7877_ts_event_release(ts);
423 }
424
425 /* we know the chip's in lowpower mode since we always
426 * leave it that way after every request
427 */
428
429 mutex_unlock(&ts->mutex);
430 }
431
432 static void ad7877_enable(struct ad7877 *ts)
433 {
434 mutex_lock(&ts->mutex);
435
436 if (ts->disabled) {
437 ts->disabled = 0;
438 enable_irq(ts->spi->irq);
439 }
440
441 mutex_unlock(&ts->mutex);
442 }
443
444 #define SHOW(name) static ssize_t \
445 name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
446 { \
447 struct ad7877 *ts = dev_get_drvdata(dev); \
448 ssize_t v = ad7877_read_adc(ts->spi, \
449 AD7877_READ_CHAN(name)); \
450 if (v < 0) \
451 return v; \
452 return sprintf(buf, "%u\n", (unsigned) v); \
453 } \
454 static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
455
456 SHOW(aux1)
457 SHOW(aux2)
458 SHOW(aux3)
459 SHOW(bat1)
460 SHOW(bat2)
461 SHOW(temp1)
462 SHOW(temp2)
463
464 static ssize_t ad7877_disable_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466 {
467 struct ad7877 *ts = dev_get_drvdata(dev);
468
469 return sprintf(buf, "%u\n", ts->disabled);
470 }
471
472 static ssize_t ad7877_disable_store(struct device *dev,
473 struct device_attribute *attr,
474 const char *buf, size_t count)
475 {
476 struct ad7877 *ts = dev_get_drvdata(dev);
477 unsigned long val;
478 int error;
479
480 error = strict_strtoul(buf, 10, &val);
481 if (error)
482 return error;
483
484 if (val)
485 ad7877_disable(ts);
486 else
487 ad7877_enable(ts);
488
489 return count;
490 }
491
492 static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
493
494 static ssize_t ad7877_dac_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
496 {
497 struct ad7877 *ts = dev_get_drvdata(dev);
498
499 return sprintf(buf, "%u\n", ts->dac);
500 }
501
502 static ssize_t ad7877_dac_store(struct device *dev,
503 struct device_attribute *attr,
504 const char *buf, size_t count)
505 {
506 struct ad7877 *ts = dev_get_drvdata(dev);
507 unsigned long val;
508 int error;
509
510 error = strict_strtoul(buf, 10, &val);
511 if (error)
512 return error;
513
514 mutex_lock(&ts->mutex);
515 ts->dac = val & 0xFF;
516 ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF);
517 mutex_unlock(&ts->mutex);
518
519 return count;
520 }
521
522 static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
523
524 static ssize_t ad7877_gpio3_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
526 {
527 struct ad7877 *ts = dev_get_drvdata(dev);
528
529 return sprintf(buf, "%u\n", ts->gpio3);
530 }
531
532 static ssize_t ad7877_gpio3_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count)
535 {
536 struct ad7877 *ts = dev_get_drvdata(dev);
537 unsigned long val;
538 int error;
539
540 error = strict_strtoul(buf, 10, &val);
541 if (error)
542 return error;
543
544 mutex_lock(&ts->mutex);
545 ts->gpio3 = !!val;
546 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
547 (ts->gpio4 << 4) | (ts->gpio3 << 5));
548 mutex_unlock(&ts->mutex);
549
550 return count;
551 }
552
553 static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
554
555 static ssize_t ad7877_gpio4_show(struct device *dev,
556 struct device_attribute *attr, char *buf)
557 {
558 struct ad7877 *ts = dev_get_drvdata(dev);
559
560 return sprintf(buf, "%u\n", ts->gpio4);
561 }
562
563 static ssize_t ad7877_gpio4_store(struct device *dev,
564 struct device_attribute *attr,
565 const char *buf, size_t count)
566 {
567 struct ad7877 *ts = dev_get_drvdata(dev);
568 unsigned long val;
569 int error;
570
571 error = strict_strtoul(buf, 10, &val);
572 if (error)
573 return error;
574
575 mutex_lock(&ts->mutex);
576 ts->gpio4 = !!val;
577 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
578 (ts->gpio4 << 4) | (ts->gpio3 << 5));
579 mutex_unlock(&ts->mutex);
580
581 return count;
582 }
583
584 static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store);
585
586 static struct attribute *ad7877_attributes[] = {
587 &dev_attr_temp1.attr,
588 &dev_attr_temp2.attr,
589 &dev_attr_aux1.attr,
590 &dev_attr_aux2.attr,
591 &dev_attr_bat1.attr,
592 &dev_attr_bat2.attr,
593 &dev_attr_disable.attr,
594 &dev_attr_dac.attr,
595 &dev_attr_gpio4.attr,
596 NULL
597 };
598
599 static const struct attribute_group ad7877_attr_group = {
600 .attrs = ad7877_attributes,
601 };
602
603 static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
604 {
605 struct spi_message *m;
606 int i;
607
608 ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) |
609 AD7877_POL(ts->stopacq_polarity) |
610 AD7877_AVG(ts->averaging) | AD7877_PM(1) |
611 AD7877_TMR(ts->pen_down_acc_interval) |
612 AD7877_ACQ(ts->acquisition_time) |
613 AD7877_FCD(ts->first_conversion_delay);
614
615 ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2);
616
617 ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) |
618 AD7877_READADD(AD7877_REG_XPLUS-1) |
619 AD7877_MODE_SEQ1 | AD7877_DFR;
620
621 ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1);
622
623 ts->cmd_dummy = 0;
624
625 m = &ts->msg;
626
627 spi_message_init(m);
628
629 m->complete = ad7877_callback;
630 m->context = ts;
631
632 ts->xfer[0].tx_buf = &ts->cmd_crtl1;
633 ts->xfer[0].len = 2;
634
635 spi_message_add_tail(&ts->xfer[0], m);
636
637 ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */
638 ts->xfer[1].len = 2;
639
640 spi_message_add_tail(&ts->xfer[1], m);
641
642 for (i = 0; i < 11; i++) {
643 ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
644 ts->xfer[i + 2].len = 2;
645 spi_message_add_tail(&ts->xfer[i + 2], m);
646 }
647 }
648
649 static int __devinit ad7877_probe(struct spi_device *spi)
650 {
651 struct ad7877 *ts;
652 struct input_dev *input_dev;
653 struct ad7877_platform_data *pdata = spi->dev.platform_data;
654 int err;
655 u16 verify;
656
657 if (!spi->irq) {
658 dev_dbg(&spi->dev, "no IRQ?\n");
659 return -ENODEV;
660 }
661
662 if (!pdata) {
663 dev_dbg(&spi->dev, "no platform data?\n");
664 return -ENODEV;
665 }
666
667 /* don't exceed max specified SPI CLK frequency */
668 if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
669 dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
670 return -EINVAL;
671 }
672
673 ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL);
674 input_dev = input_allocate_device();
675 if (!ts || !input_dev) {
676 err = -ENOMEM;
677 goto err_free_mem;
678 }
679
680 dev_set_drvdata(&spi->dev, ts);
681 ts->spi = spi;
682 ts->input = input_dev;
683
684 setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts);
685 mutex_init(&ts->mutex);
686 spin_lock_init(&ts->lock);
687
688 ts->model = pdata->model ? : 7877;
689 ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
690 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
691 ts->pressure_max = pdata->pressure_max ? : ~0;
692
693 ts->stopacq_polarity = pdata->stopacq_polarity;
694 ts->first_conversion_delay = pdata->first_conversion_delay;
695 ts->acquisition_time = pdata->acquisition_time;
696 ts->averaging = pdata->averaging;
697 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
698
699 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
700
701 input_dev->name = "AD7877 Touchscreen";
702 input_dev->phys = ts->phys;
703 input_dev->dev.parent = &spi->dev;
704
705 __set_bit(EV_ABS, input_dev->evbit);
706 __set_bit(ABS_X, input_dev->absbit);
707 __set_bit(ABS_Y, input_dev->absbit);
708 __set_bit(ABS_PRESSURE, input_dev->absbit);
709
710 input_set_abs_params(input_dev, ABS_X,
711 pdata->x_min ? : 0,
712 pdata->x_max ? : MAX_12BIT,
713 0, 0);
714 input_set_abs_params(input_dev, ABS_Y,
715 pdata->y_min ? : 0,
716 pdata->y_max ? : MAX_12BIT,
717 0, 0);
718 input_set_abs_params(input_dev, ABS_PRESSURE,
719 pdata->pressure_min, pdata->pressure_max, 0, 0);
720
721 ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE);
722
723 verify = ad7877_read(spi, AD7877_REG_SEQ1);
724
725 if (verify != AD7877_MM_SEQUENCE){
726 dev_err(&spi->dev, "%s: Failed to probe %s\n",
727 dev_name(&spi->dev), input_dev->name);
728 err = -ENODEV;
729 goto err_free_mem;
730 }
731
732 if (gpio3)
733 ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF);
734
735 ad7877_setup_ts_def_msg(spi, ts);
736
737 /* Request AD7877 /DAV GPIO interrupt */
738
739 err = request_irq(spi->irq, ad7877_irq, IRQF_TRIGGER_FALLING,
740 spi->dev.driver->name, ts);
741 if (err) {
742 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
743 goto err_free_mem;
744 }
745
746 err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group);
747 if (err)
748 goto err_free_irq;
749
750 err = device_create_file(&spi->dev,
751 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
752 if (err)
753 goto err_remove_attr_group;
754
755 err = input_register_device(input_dev);
756 if (err)
757 goto err_remove_attr;
758
759 return 0;
760
761 err_remove_attr:
762 device_remove_file(&spi->dev,
763 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
764 err_remove_attr_group:
765 sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
766 err_free_irq:
767 free_irq(spi->irq, ts);
768 err_free_mem:
769 input_free_device(input_dev);
770 kfree(ts);
771 dev_set_drvdata(&spi->dev, NULL);
772 return err;
773 }
774
775 static int __devexit ad7877_remove(struct spi_device *spi)
776 {
777 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
778
779 sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
780 device_remove_file(&spi->dev,
781 gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
782
783 ad7877_disable(ts);
784 free_irq(ts->spi->irq, ts);
785
786 input_unregister_device(ts->input);
787 kfree(ts);
788
789 dev_dbg(&spi->dev, "unregistered touchscreen\n");
790 dev_set_drvdata(&spi->dev, NULL);
791
792 return 0;
793 }
794
795 #ifdef CONFIG_PM
796 static int ad7877_suspend(struct spi_device *spi, pm_message_t message)
797 {
798 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
799
800 ad7877_disable(ts);
801
802 return 0;
803 }
804
805 static int ad7877_resume(struct spi_device *spi)
806 {
807 struct ad7877 *ts = dev_get_drvdata(&spi->dev);
808
809 ad7877_enable(ts);
810
811 return 0;
812 }
813 #else
814 #define ad7877_suspend NULL
815 #define ad7877_resume NULL
816 #endif
817
818 static struct spi_driver ad7877_driver = {
819 .driver = {
820 .name = "ad7877",
821 .bus = &spi_bus_type,
822 .owner = THIS_MODULE,
823 },
824 .probe = ad7877_probe,
825 .remove = __devexit_p(ad7877_remove),
826 .suspend = ad7877_suspend,
827 .resume = ad7877_resume,
828 };
829
830 static int __init ad7877_init(void)
831 {
832 return spi_register_driver(&ad7877_driver);
833 }
834 module_init(ad7877_init);
835
836 static void __exit ad7877_exit(void)
837 {
838 spi_unregister_driver(&ad7877_driver);
839 }
840 module_exit(ad7877_exit);
841
842 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
843 MODULE_DESCRIPTION("AD7877 touchscreen Driver");
844 MODULE_LICENSE("GPL");
845
|
This page was automatically generated by the
LXR engine.
|