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25#include <linux/device.h>
26#include <linux/delay.h>
27#include <linux/input.h>
28#include <linux/interrupt.h>
29#include <linux/pm.h>
30#include <linux/slab.h>
31#include <linux/spi/spi.h>
32#include <linux/spi/ad7877.h>
33#include <linux/module.h>
34#include <asm/irq.h>
35
36#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100)
37
38#define MAX_SPI_FREQ_HZ 20000000
39#define MAX_12BIT ((1<<12)-1)
40
41#define AD7877_REG_ZEROS 0
42#define AD7877_REG_CTRL1 1
43#define AD7877_REG_CTRL2 2
44#define AD7877_REG_ALERT 3
45#define AD7877_REG_AUX1HIGH 4
46#define AD7877_REG_AUX1LOW 5
47#define AD7877_REG_BAT1HIGH 6
48#define AD7877_REG_BAT1LOW 7
49#define AD7877_REG_BAT2HIGH 8
50#define AD7877_REG_BAT2LOW 9
51#define AD7877_REG_TEMP1HIGH 10
52#define AD7877_REG_TEMP1LOW 11
53#define AD7877_REG_SEQ0 12
54#define AD7877_REG_SEQ1 13
55#define AD7877_REG_DAC 14
56#define AD7877_REG_NONE1 15
57#define AD7877_REG_EXTWRITE 15
58#define AD7877_REG_XPLUS 16
59#define AD7877_REG_YPLUS 17
60#define AD7877_REG_Z2 18
61#define AD7877_REG_aux1 19
62#define AD7877_REG_aux2 20
63#define AD7877_REG_aux3 21
64#define AD7877_REG_bat1 22
65#define AD7877_REG_bat2 23
66#define AD7877_REG_temp1 24
67#define AD7877_REG_temp2 25
68#define AD7877_REG_Z1 26
69#define AD7877_REG_GPIOCTRL1 27
70#define AD7877_REG_GPIOCTRL2 28
71#define AD7877_REG_GPIODATA 29
72#define AD7877_REG_NONE2 30
73#define AD7877_REG_NONE3 31
74
75#define AD7877_SEQ_YPLUS_BIT (1<<11)
76#define AD7877_SEQ_XPLUS_BIT (1<<10)
77#define AD7877_SEQ_Z2_BIT (1<<9)
78#define AD7877_SEQ_AUX1_BIT (1<<8)
79#define AD7877_SEQ_AUX2_BIT (1<<7)
80#define AD7877_SEQ_AUX3_BIT (1<<6)
81#define AD7877_SEQ_BAT1_BIT (1<<5)
82#define AD7877_SEQ_BAT2_BIT (1<<4)
83#define AD7877_SEQ_TEMP1_BIT (1<<3)
84#define AD7877_SEQ_TEMP2_BIT (1<<2)
85#define AD7877_SEQ_Z1_BIT (1<<1)
86
87enum {
88 AD7877_SEQ_YPOS = 0,
89 AD7877_SEQ_XPOS = 1,
90 AD7877_SEQ_Z2 = 2,
91 AD7877_SEQ_AUX1 = 3,
92 AD7877_SEQ_AUX2 = 4,
93 AD7877_SEQ_AUX3 = 5,
94 AD7877_SEQ_BAT1 = 6,
95 AD7877_SEQ_BAT2 = 7,
96 AD7877_SEQ_TEMP1 = 8,
97 AD7877_SEQ_TEMP2 = 9,
98 AD7877_SEQ_Z1 = 10,
99 AD7877_NR_SENSE = 11,
100};
101
102
103#define AD7877_DAC_CONF 0x1
104
105
106#define AD7877_EXTW_GPIO_3_CONF 0x1C4
107#define AD7877_EXTW_GPIO_DATA 0x200
108
109
110#define AD7877_TMR(x) ((x & 0x3) << 0)
111#define AD7877_REF(x) ((x & 0x1) << 2)
112#define AD7877_POL(x) ((x & 0x1) << 3)
113#define AD7877_FCD(x) ((x & 0x3) << 4)
114#define AD7877_PM(x) ((x & 0x3) << 6)
115#define AD7877_ACQ(x) ((x & 0x3) << 8)
116#define AD7877_AVG(x) ((x & 0x3) << 10)
117
118
119#define AD7877_SER (1 << 11)
120#define AD7877_DFR (0 << 11)
121
122#define AD7877_MODE_NOC (0)
123#define AD7877_MODE_SCC (1)
124#define AD7877_MODE_SEQ0 (2)
125#define AD7877_MODE_SEQ1 (3)
126
127#define AD7877_CHANADD(x) ((x&0xF)<<7)
128#define AD7877_READADD(x) ((x)<<2)
129#define AD7877_WRITEADD(x) ((x)<<12)
130
131#define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \
132 AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \
133 AD7877_READADD(AD7877_REG_ ## x))
134
135#define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \
136 AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT)
137
138
139
140
141
142struct ser_req {
143 u16 reset;
144 u16 ref_on;
145 u16 command;
146 struct spi_message msg;
147 struct spi_transfer xfer[6];
148
149
150
151
152
153 u16 sample ____cacheline_aligned;
154};
155
156struct ad7877 {
157 struct input_dev *input;
158 char phys[32];
159
160 struct spi_device *spi;
161 u16 model;
162 u16 vref_delay_usecs;
163 u16 x_plate_ohms;
164 u16 pressure_max;
165
166 u16 cmd_crtl1;
167 u16 cmd_crtl2;
168 u16 cmd_dummy;
169 u16 dac;
170
171 u8 stopacq_polarity;
172 u8 first_conversion_delay;
173 u8 acquisition_time;
174 u8 averaging;
175 u8 pen_down_acc_interval;
176
177 struct spi_transfer xfer[AD7877_NR_SENSE + 2];
178 struct spi_message msg;
179
180 struct mutex mutex;
181 bool disabled;
182 bool gpio3;
183 bool gpio4;
184
185 spinlock_t lock;
186 struct timer_list timer;
187
188
189
190
191
192 u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned;
193};
194
195static bool gpio3;
196module_param(gpio3, bool, 0);
197MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
198
199static int ad7877_read(struct spi_device *spi, u16 reg)
200{
201 struct ser_req *req;
202 int status, ret;
203
204 req = kzalloc(sizeof *req, GFP_KERNEL);
205 if (!req)
206 return -ENOMEM;
207
208 spi_message_init(&req->msg);
209
210 req->command = (u16) (AD7877_WRITEADD(AD7877_REG_CTRL1) |
211 AD7877_READADD(reg));
212 req->xfer[0].tx_buf = &req->command;
213 req->xfer[0].len = 2;
214 req->xfer[0].cs_change = 1;
215
216 req->xfer[1].rx_buf = &req->sample;
217 req->xfer[1].len = 2;
218
219 spi_message_add_tail(&req->xfer[0], &req->msg);
220 spi_message_add_tail(&req->xfer[1], &req->msg);
221
222 status = spi_sync(spi, &req->msg);
223 ret = status ? : req->sample;
224
225 kfree(req);
226
227 return ret;
228}
229
230static int ad7877_write(struct spi_device *spi, u16 reg, u16 val)
231{
232 struct ser_req *req;
233 int status;
234
235 req = kzalloc(sizeof *req, GFP_KERNEL);
236 if (!req)
237 return -ENOMEM;
238
239 spi_message_init(&req->msg);
240
241 req->command = (u16) (AD7877_WRITEADD(reg) | (val & MAX_12BIT));
242 req->xfer[0].tx_buf = &req->command;
243 req->xfer[0].len = 2;
244
245 spi_message_add_tail(&req->xfer[0], &req->msg);
246
247 status = spi_sync(spi, &req->msg);
248
249 kfree(req);
250
251 return status;
252}
253
254static int ad7877_read_adc(struct spi_device *spi, unsigned command)
255{
256 struct ad7877 *ts = spi_get_drvdata(spi);
257 struct ser_req *req;
258 int status;
259 int sample;
260 int i;
261
262 req = kzalloc(sizeof *req, GFP_KERNEL);
263 if (!req)
264 return -ENOMEM;
265
266 spi_message_init(&req->msg);
267
268
269 req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) |
270 AD7877_POL(ts->stopacq_polarity) |
271 AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) |
272 AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0);
273
274 req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC;
275
276 req->command = (u16) command;
277
278 req->xfer[0].tx_buf = &req->reset;
279 req->xfer[0].len = 2;
280 req->xfer[0].cs_change = 1;
281
282 req->xfer[1].tx_buf = &req->ref_on;
283 req->xfer[1].len = 2;
284 req->xfer[1].delay_usecs = ts->vref_delay_usecs;
285 req->xfer[1].cs_change = 1;
286
287 req->xfer[2].tx_buf = &req->command;
288 req->xfer[2].len = 2;
289 req->xfer[2].delay_usecs = ts->vref_delay_usecs;
290 req->xfer[2].cs_change = 1;
291
292 req->xfer[3].rx_buf = &req->sample;
293 req->xfer[3].len = 2;
294 req->xfer[3].cs_change = 1;
295
296 req->xfer[4].tx_buf = &ts->cmd_crtl2;
297 req->xfer[4].len = 2;
298 req->xfer[4].cs_change = 1;
299
300 req->xfer[5].tx_buf = &ts->cmd_crtl1;
301 req->xfer[5].len = 2;
302
303
304
305
306 for (i = 0; i < 6; i++)
307 spi_message_add_tail(&req->xfer[i], &req->msg);
308
309 status = spi_sync(spi, &req->msg);
310 sample = req->sample;
311
312 kfree(req);
313
314 return status ? : sample;
315}
316
317static int ad7877_process_data(struct ad7877 *ts)
318{
319 struct input_dev *input_dev = ts->input;
320 unsigned Rt;
321 u16 x, y, z1, z2;
322
323 x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT;
324 y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT;
325 z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT;
326 z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT;
327
328
329
330
331
332
333
334
335
336
337
338 if (likely(x && z1)) {
339
340 Rt = (z2 - z1) * x * ts->x_plate_ohms;
341 Rt /= z1;
342 Rt = (Rt + 2047) >> 12;
343
344
345
346
347
348 if (Rt > ts->pressure_max)
349 return -EINVAL;
350
351 if (!timer_pending(&ts->timer))
352 input_report_key(input_dev, BTN_TOUCH, 1);
353
354 input_report_abs(input_dev, ABS_X, x);
355 input_report_abs(input_dev, ABS_Y, y);
356 input_report_abs(input_dev, ABS_PRESSURE, Rt);
357 input_sync(input_dev);
358
359 return 0;
360 }
361
362 return -EINVAL;
363}
364
365static inline void ad7877_ts_event_release(struct ad7877 *ts)
366{
367 struct input_dev *input_dev = ts->input;
368
369 input_report_abs(input_dev, ABS_PRESSURE, 0);
370 input_report_key(input_dev, BTN_TOUCH, 0);
371 input_sync(input_dev);
372}
373
374static void ad7877_timer(struct timer_list *t)
375{
376 struct ad7877 *ts = from_timer(ts, t, timer);
377 unsigned long flags;
378
379 spin_lock_irqsave(&ts->lock, flags);
380 ad7877_ts_event_release(ts);
381 spin_unlock_irqrestore(&ts->lock, flags);
382}
383
384static irqreturn_t ad7877_irq(int irq, void *handle)
385{
386 struct ad7877 *ts = handle;
387 unsigned long flags;
388 int error;
389
390 error = spi_sync(ts->spi, &ts->msg);
391 if (error) {
392 dev_err(&ts->spi->dev, "spi_sync --> %d\n", error);
393 goto out;
394 }
395
396 spin_lock_irqsave(&ts->lock, flags);
397 error = ad7877_process_data(ts);
398 if (!error)
399 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
400 spin_unlock_irqrestore(&ts->lock, flags);
401
402out:
403 return IRQ_HANDLED;
404}
405
406static void ad7877_disable(void *data)
407{
408 struct ad7877 *ts = data;
409
410 mutex_lock(&ts->mutex);
411
412 if (!ts->disabled) {
413 ts->disabled = true;
414 disable_irq(ts->spi->irq);
415
416 if (del_timer_sync(&ts->timer))
417 ad7877_ts_event_release(ts);
418 }
419
420
421
422
423
424
425 mutex_unlock(&ts->mutex);
426}
427
428static void ad7877_enable(struct ad7877 *ts)
429{
430 mutex_lock(&ts->mutex);
431
432 if (ts->disabled) {
433 ts->disabled = false;
434 enable_irq(ts->spi->irq);
435 }
436
437 mutex_unlock(&ts->mutex);
438}
439
440#define SHOW(name) static ssize_t \
441name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \
442{ \
443 struct ad7877 *ts = dev_get_drvdata(dev); \
444 ssize_t v = ad7877_read_adc(ts->spi, \
445 AD7877_READ_CHAN(name)); \
446 if (v < 0) \
447 return v; \
448 return sprintf(buf, "%u\n", (unsigned) v); \
449} \
450static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
451
452SHOW(aux1)
453SHOW(aux2)
454SHOW(aux3)
455SHOW(bat1)
456SHOW(bat2)
457SHOW(temp1)
458SHOW(temp2)
459
460static ssize_t ad7877_disable_show(struct device *dev,
461 struct device_attribute *attr, char *buf)
462{
463 struct ad7877 *ts = dev_get_drvdata(dev);
464
465 return sprintf(buf, "%u\n", ts->disabled);
466}
467
468static ssize_t ad7877_disable_store(struct device *dev,
469 struct device_attribute *attr,
470 const char *buf, size_t count)
471{
472 struct ad7877 *ts = dev_get_drvdata(dev);
473 unsigned int val;
474 int error;
475
476 error = kstrtouint(buf, 10, &val);
477 if (error)
478 return error;
479
480 if (val)
481 ad7877_disable(ts);
482 else
483 ad7877_enable(ts);
484
485 return count;
486}
487
488static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store);
489
490static ssize_t ad7877_dac_show(struct device *dev,
491 struct device_attribute *attr, char *buf)
492{
493 struct ad7877 *ts = dev_get_drvdata(dev);
494
495 return sprintf(buf, "%u\n", ts->dac);
496}
497
498static ssize_t ad7877_dac_store(struct device *dev,
499 struct device_attribute *attr,
500 const char *buf, size_t count)
501{
502 struct ad7877 *ts = dev_get_drvdata(dev);
503 unsigned int val;
504 int error;
505
506 error = kstrtouint(buf, 10, &val);
507 if (error)
508 return error;
509
510 mutex_lock(&ts->mutex);
511 ts->dac = val & 0xFF;
512 ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF);
513 mutex_unlock(&ts->mutex);
514
515 return count;
516}
517
518static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store);
519
520static ssize_t ad7877_gpio3_show(struct device *dev,
521 struct device_attribute *attr, char *buf)
522{
523 struct ad7877 *ts = dev_get_drvdata(dev);
524
525 return sprintf(buf, "%u\n", ts->gpio3);
526}
527
528static ssize_t ad7877_gpio3_store(struct device *dev,
529 struct device_attribute *attr,
530 const char *buf, size_t count)
531{
532 struct ad7877 *ts = dev_get_drvdata(dev);
533 unsigned int val;
534 int error;
535
536 error = kstrtouint(buf, 10, &val);
537 if (error)
538 return error;
539
540 mutex_lock(&ts->mutex);
541 ts->gpio3 = !!val;
542 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
543 (ts->gpio4 << 4) | (ts->gpio3 << 5));
544 mutex_unlock(&ts->mutex);
545
546 return count;
547}
548
549static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store);
550
551static ssize_t ad7877_gpio4_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct ad7877 *ts = dev_get_drvdata(dev);
555
556 return sprintf(buf, "%u\n", ts->gpio4);
557}
558
559static ssize_t ad7877_gpio4_store(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf, size_t count)
562{
563 struct ad7877 *ts = dev_get_drvdata(dev);
564 unsigned int val;
565 int error;
566
567 error = kstrtouint(buf, 10, &val);
568 if (error)
569 return error;
570
571 mutex_lock(&ts->mutex);
572 ts->gpio4 = !!val;
573 ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA |
574 (ts->gpio4 << 4) | (ts->gpio3 << 5));
575 mutex_unlock(&ts->mutex);
576
577 return count;
578}
579
580static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store);
581
582static struct attribute *ad7877_attributes[] = {
583 &dev_attr_temp1.attr,
584 &dev_attr_temp2.attr,
585 &dev_attr_aux1.attr,
586 &dev_attr_aux2.attr,
587 &dev_attr_aux3.attr,
588 &dev_attr_bat1.attr,
589 &dev_attr_bat2.attr,
590 &dev_attr_disable.attr,
591 &dev_attr_dac.attr,
592 &dev_attr_gpio3.attr,
593 &dev_attr_gpio4.attr,
594 NULL
595};
596
597static umode_t ad7877_attr_is_visible(struct kobject *kobj,
598 struct attribute *attr, int n)
599{
600 umode_t mode = attr->mode;
601
602 if (attr == &dev_attr_aux3.attr) {
603 if (gpio3)
604 mode = 0;
605 } else if (attr == &dev_attr_gpio3.attr) {
606 if (!gpio3)
607 mode = 0;
608 }
609
610 return mode;
611}
612
613static const struct attribute_group ad7877_attr_group = {
614 .is_visible = ad7877_attr_is_visible,
615 .attrs = ad7877_attributes,
616};
617
618static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts)
619{
620 struct spi_message *m;
621 int i;
622
623 ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) |
624 AD7877_POL(ts->stopacq_polarity) |
625 AD7877_AVG(ts->averaging) | AD7877_PM(1) |
626 AD7877_TMR(ts->pen_down_acc_interval) |
627 AD7877_ACQ(ts->acquisition_time) |
628 AD7877_FCD(ts->first_conversion_delay);
629
630 ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2);
631
632 ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) |
633 AD7877_READADD(AD7877_REG_XPLUS-1) |
634 AD7877_MODE_SEQ1 | AD7877_DFR;
635
636 ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1);
637
638 ts->cmd_dummy = 0;
639
640 m = &ts->msg;
641
642 spi_message_init(m);
643
644 m->context = ts;
645
646 ts->xfer[0].tx_buf = &ts->cmd_crtl1;
647 ts->xfer[0].len = 2;
648 ts->xfer[0].cs_change = 1;
649
650 spi_message_add_tail(&ts->xfer[0], m);
651
652 ts->xfer[1].tx_buf = &ts->cmd_dummy;
653 ts->xfer[1].len = 2;
654 ts->xfer[1].cs_change = 1;
655
656 spi_message_add_tail(&ts->xfer[1], m);
657
658 for (i = 0; i < AD7877_NR_SENSE; i++) {
659 ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i];
660 ts->xfer[i + 2].len = 2;
661 if (i < (AD7877_NR_SENSE - 1))
662 ts->xfer[i + 2].cs_change = 1;
663 spi_message_add_tail(&ts->xfer[i + 2], m);
664 }
665}
666
667static int ad7877_probe(struct spi_device *spi)
668{
669 struct ad7877 *ts;
670 struct input_dev *input_dev;
671 struct ad7877_platform_data *pdata = dev_get_platdata(&spi->dev);
672 int err;
673 u16 verify;
674
675 if (!spi->irq) {
676 dev_dbg(&spi->dev, "no IRQ?\n");
677 return -ENODEV;
678 }
679
680 if (!pdata) {
681 dev_dbg(&spi->dev, "no platform data?\n");
682 return -ENODEV;
683 }
684
685
686 if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
687 dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz);
688 return -EINVAL;
689 }
690
691 spi->bits_per_word = 16;
692 err = spi_setup(spi);
693 if (err) {
694 dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
695 return err;
696 }
697
698 ts = devm_kzalloc(&spi->dev, sizeof(struct ad7877), GFP_KERNEL);
699 if (!ts)
700 return -ENOMEM;
701
702 input_dev = devm_input_allocate_device(&spi->dev);
703 if (!input_dev)
704 return -ENOMEM;
705
706 err = devm_add_action_or_reset(&spi->dev, ad7877_disable, ts);
707 if (err)
708 return err;
709
710 spi_set_drvdata(spi, ts);
711 ts->spi = spi;
712 ts->input = input_dev;
713
714 timer_setup(&ts->timer, ad7877_timer, 0);
715 mutex_init(&ts->mutex);
716 spin_lock_init(&ts->lock);
717
718 ts->model = pdata->model ? : 7877;
719 ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
720 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
721 ts->pressure_max = pdata->pressure_max ? : ~0;
722
723 ts->stopacq_polarity = pdata->stopacq_polarity;
724 ts->first_conversion_delay = pdata->first_conversion_delay;
725 ts->acquisition_time = pdata->acquisition_time;
726 ts->averaging = pdata->averaging;
727 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
728
729 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
730
731 input_dev->name = "AD7877 Touchscreen";
732 input_dev->phys = ts->phys;
733 input_dev->dev.parent = &spi->dev;
734
735 __set_bit(EV_KEY, input_dev->evbit);
736 __set_bit(BTN_TOUCH, input_dev->keybit);
737 __set_bit(EV_ABS, input_dev->evbit);
738 __set_bit(ABS_X, input_dev->absbit);
739 __set_bit(ABS_Y, input_dev->absbit);
740 __set_bit(ABS_PRESSURE, input_dev->absbit);
741
742 input_set_abs_params(input_dev, ABS_X,
743 pdata->x_min ? : 0,
744 pdata->x_max ? : MAX_12BIT,
745 0, 0);
746 input_set_abs_params(input_dev, ABS_Y,
747 pdata->y_min ? : 0,
748 pdata->y_max ? : MAX_12BIT,
749 0, 0);
750 input_set_abs_params(input_dev, ABS_PRESSURE,
751 pdata->pressure_min, pdata->pressure_max, 0, 0);
752
753 ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE);
754
755 verify = ad7877_read(spi, AD7877_REG_SEQ1);
756
757 if (verify != AD7877_MM_SEQUENCE) {
758 dev_err(&spi->dev, "%s: Failed to probe %s\n",
759 dev_name(&spi->dev), input_dev->name);
760 return -ENODEV;
761 }
762
763 if (gpio3)
764 ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF);
765
766 ad7877_setup_ts_def_msg(spi, ts);
767
768
769
770 err = devm_request_threaded_irq(&spi->dev, spi->irq, NULL, ad7877_irq,
771 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
772 spi->dev.driver->name, ts);
773 if (err) {
774 dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
775 return err;
776 }
777
778 err = devm_device_add_group(&spi->dev, &ad7877_attr_group);
779 if (err)
780 return err;
781
782 err = input_register_device(input_dev);
783 if (err)
784 return err;
785
786 return 0;
787}
788
789static int __maybe_unused ad7877_suspend(struct device *dev)
790{
791 struct ad7877 *ts = dev_get_drvdata(dev);
792
793 ad7877_disable(ts);
794
795 return 0;
796}
797
798static int __maybe_unused ad7877_resume(struct device *dev)
799{
800 struct ad7877 *ts = dev_get_drvdata(dev);
801
802 ad7877_enable(ts);
803
804 return 0;
805}
806
807static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume);
808
809static struct spi_driver ad7877_driver = {
810 .driver = {
811 .name = "ad7877",
812 .pm = &ad7877_pm,
813 },
814 .probe = ad7877_probe,
815};
816
817module_spi_driver(ad7877_driver);
818
819MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
820MODULE_DESCRIPTION("AD7877 touchscreen Driver");
821MODULE_LICENSE("GPL");
822MODULE_ALIAS("spi:ad7877");
823
