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path: root/drivers/input/touchscreen/rmi4/rmi_spi.c
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Diffstat (limited to 'drivers/input/touchscreen/rmi4/rmi_spi.c')
-rw-r--r--drivers/input/touchscreen/rmi4/rmi_spi.c869
1 files changed, 869 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/rmi4/rmi_spi.c b/drivers/input/touchscreen/rmi4/rmi_spi.c
new file mode 100644
index 00000000000..41f72657f82
--- /dev/null
+++ b/drivers/input/touchscreen/rmi4/rmi_spi.c
@@ -0,0 +1,869 @@
1/*
2 * Copyright (c) 2011 Synaptics Incorporated
3 * Copyright (c) 2011 Unixphere
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/spi/spi.h>
22#include <linux/delay.h>
23#include <linux/slab.h>
24#include <linux/completion.h>
25#include <linux/sched.h>
26#include <linux/gpio.h>
27#include <linux/rmi.h>
28
29#define COMMS_DEBUG 0
30
31#define RMI_PROTOCOL_VERSION_ADDRESS 0xa0fd
32#define SPI_V2_UNIFIED_READ 0xc0
33#define SPI_V2_WRITE 0x40
34#define SPI_V2_PREPARE_SPLIT_READ 0xc8
35#define SPI_V2_EXECUTE_SPLIT_READ 0xca
36
37#define RMI_SPI_BLOCK_DELAY_US 65
38#define RMI_SPI_BYTE_DELAY_US 65
39#define RMI_SPI_WRITE_DELAY_US 0
40
41#define RMI_V1_READ_FLAG 0x80
42
43#define RMI_PAGE_SELECT_REGISTER 0x00FF
44#define RMI_SPI_PAGE(addr) (((addr) >> 8) & 0x80)
45
46static char *spi_v1_proto_name = "spi";
47static char *spi_v2_proto_name = "spiv2";
48
49struct rmi_spi_data {
50 struct mutex page_mutex;
51 int page;
52 int (*set_page) (struct rmi_phys_device *phys, u8 page);
53 bool split_read_pending;
54 int enabled;
55 int irq;
56 int irq_flags;
57 struct rmi_phys_device *phys;
58 struct completion irq_comp;
59};
60
61static irqreturn_t rmi_spi_hard_irq(int irq, void *p)
62{
63 struct rmi_phys_device *phys = p;
64 struct rmi_spi_data *data = phys->data;
65 struct rmi_device_platform_data *pdata = phys->dev->platform_data;
66
67 if (data->split_read_pending &&
68 gpio_get_value(irq_to_gpio(irq)) == pdata->irq_polarity) {
69 phys->info.attn_count++;
70 complete(&data->irq_comp);
71 return IRQ_HANDLED;
72 }
73
74 return IRQ_WAKE_THREAD;
75}
76
77static irqreturn_t rmi_spi_irq_thread(int irq, void *p)
78{
79 struct rmi_phys_device *phys = p;
80 struct rmi_device *rmi_dev = phys->rmi_dev;
81 struct rmi_driver *driver = rmi_dev->driver;
82 struct rmi_device_platform_data *pdata = phys->dev->platform_data;
83
84 if (gpio_get_value(irq_to_gpio(irq)) == pdata->irq_polarity) {
85 phys->info.attn_count++;
86 if (driver && driver->irq_handler)
87 driver->irq_handler(rmi_dev, irq);
88 }
89
90 return IRQ_HANDLED;
91}
92
93static int rmi_spi_xfer(struct rmi_phys_device *phys,
94 const u8 *txbuf, unsigned n_tx, u8 *rxbuf, unsigned n_rx)
95{
96 struct spi_device *client = to_spi_device(phys->dev);
97 struct rmi_spi_data *v2_data = phys->data;
98 struct rmi_device_platform_data *pdata = phys->dev->platform_data;
99 int status;
100 struct spi_message message;
101 struct spi_transfer *xfers;
102 int total_bytes = n_tx + n_rx;
103 u8 local_buf[total_bytes];
104 int xfer_count = 0;
105 int xfer_index = 0;
106 int block_delay = n_rx > 0 ? pdata->spi_data.block_delay_us : 0;
107 int byte_delay = n_rx > 1 ? pdata->spi_data.read_delay_us : 0;
108 int write_delay = n_tx > 1 ? pdata->spi_data.write_delay_us : 0;
109#if COMMS_DEBUG
110 int i;
111#endif
112 // pr_info("in function ____%s____ \n", __func__);
113
114 if (v2_data->split_read_pending) {
115 block_delay =
116 n_rx > 0 ? pdata->spi_data.split_read_block_delay_us : 0;
117 byte_delay =
118 n_tx > 1 ? pdata->spi_data.split_read_byte_delay_us : 0;
119 write_delay = 0;
120 }
121
122 if (n_tx) {
123 phys->info.tx_count++;
124 phys->info.tx_bytes += n_tx;
125 if (write_delay)
126 xfer_count += n_tx;
127 else
128 xfer_count += 1;
129 }
130
131 if (n_rx) {
132 phys->info.rx_count++;
133 phys->info.rx_bytes += n_rx;
134 if (byte_delay)
135 xfer_count += n_rx;
136 else
137 xfer_count += 1;
138 }
139
140 xfers = kcalloc(xfer_count,
141 sizeof(struct spi_transfer), GFP_KERNEL);
142 if (!xfers)
143 return -ENOMEM;
144
145 spi_message_init(&message);
146
147 if (n_tx) {
148 if (write_delay) {
149 for (xfer_index = 0; xfer_index < n_tx;
150 xfer_index++) {
151 memset(&xfers[xfer_index], 0,
152 sizeof(struct spi_transfer));
153 xfers[xfer_index].len = 1;
154 xfers[xfer_index].delay_usecs = write_delay;
155 xfers[xfer_index].cs_change = 1;
156 xfers[xfer_index].tx_buf = txbuf + xfer_index;
157 spi_message_add_tail(&xfers[xfer_index],
158 &message);
159 }
160 } else {
161 memset(&xfers[0], 0, sizeof(struct spi_transfer));
162 xfers[0].len = n_tx;
163 spi_message_add_tail(&xfers[0], &message);
164 memcpy(local_buf, txbuf, n_tx);
165 xfers[0].tx_buf = local_buf;
166 xfer_index++;
167 }
168 if (block_delay){
169 xfers[xfer_index-1].delay_usecs = block_delay;
170 xfers[xfer_index].cs_change = 1;
171 }
172 }
173 if (n_rx) {
174 if (byte_delay) {
175 int buffer_offset = n_tx;
176 for (; xfer_index < xfer_count; xfer_index++) {
177 memset(&xfers[xfer_index], 0,
178 sizeof(struct spi_transfer));
179 xfers[xfer_index].len = 1;
180 xfers[xfer_index].delay_usecs = byte_delay;
181 xfers[xfer_index].cs_change = 1;
182 xfers[xfer_index].rx_buf =
183 local_buf + buffer_offset;
184 buffer_offset++;
185 spi_message_add_tail(&xfers[xfer_index],
186 &message);
187 }
188 } else {
189 memset(&xfers[xfer_index], 0,
190 sizeof(struct spi_transfer));
191 xfers[xfer_index].len = n_rx;
192 xfers[xfer_index].rx_buf = local_buf + n_tx;
193 spi_message_add_tail(&xfers[xfer_index], &message);
194 xfer_index++;
195 }
196 }
197
198#if COMMS_DEBUG
199 if (n_tx) {
200 dev_info(&client->dev, "SPI sends %d bytes: ", n_tx);
201 for (i = 0; i < n_tx; i++)
202 // dev_info(&client->dev, "%02X ", txbuf[i]);
203 pr_info(": %02X ", txbuf[i]);
204 // dev_info(&client->dev, "\n");
205 pr_info("\n");
206 }
207#endif
208
209 /* do the i/o */
210 if (pdata->spi_data.cs_assert) {
211 status = pdata->spi_data.cs_assert(
212 pdata->spi_data.cs_assert_data, true);
213 if (!status) {
214 dev_err(phys->dev, "Failed to assert CS.");
215 /* nonzero means error */
216 status = -1;
217 goto error_exit;
218 } else
219 status = 0;
220 }
221
222 if (pdata->spi_data.pre_delay_us)
223 udelay(pdata->spi_data.pre_delay_us);
224
225 status = spi_sync(client, &message);
226
227 if (pdata->spi_data.post_delay_us)
228 udelay(pdata->spi_data.post_delay_us);
229
230 if (pdata->spi_data.cs_assert) {
231 status = pdata->spi_data.cs_assert(
232 pdata->spi_data.cs_assert_data, false);
233 if (!status) {
234 dev_err(phys->dev, "Failed to deassert CS.");
235 /* nonzero means error */
236 status = -1;
237 goto error_exit;
238 } else
239 status = 0;
240 }
241
242 if (status == 0) {
243 memcpy(rxbuf, local_buf + n_tx, n_rx);
244 status = message.status;
245 } else {
246 phys->info.tx_errs++;
247 phys->info.rx_errs++;
248 dev_err(phys->dev, "spi_sync failed with error code %d.",
249 status);
250 }
251
252#if COMMS_DEBUG
253 if (n_rx) {
254 dev_info(&client->dev, "SPI received %d bytes: ", n_rx);
255 for (i = 0; i < n_rx; i++)
256 // dev_info(&client->dev, "%02X ", rxbuf[i]);
257 pr_info(": %02X ", rxbuf[i]);
258 // dev_info(&client->dev, "\n");
259 pr_info("\n");
260 }
261#endif
262
263error_exit:
264 kfree(xfers);
265 return status;
266}
267
268static int rmi_spi_v2_write_block(struct rmi_phys_device *phys, u16 addr,
269 u8 *buf, int len)
270{
271 struct rmi_spi_data *data = phys->data;
272 u8 txbuf[len + 4];
273 int error;
274 // pr_info("in function ____%s____ \n", __func__);
275
276 txbuf[0] = SPI_V2_WRITE;
277 txbuf[1] = (addr >> 8) & 0x00FF;
278 txbuf[2] = addr & 0x00FF;
279 txbuf[3] = len;
280
281 memcpy(&txbuf[4], buf, len);
282
283 mutex_lock(&data->page_mutex);
284
285 if (RMI_SPI_PAGE(addr) != data->page) {
286 error = data->set_page(phys, RMI_SPI_PAGE(addr));
287 if (error < 0)
288 goto exit;
289 }
290
291 error = rmi_spi_xfer(phys, buf, len + 4, NULL, 0);
292 if (error < 0)
293 goto exit;
294 error = len;
295
296exit:
297 mutex_unlock(&data->page_mutex);
298 return error;
299}
300
301static int rmi_spi_v2_write(struct rmi_phys_device *phys, u16 addr, u8 data)
302{
303 int error = rmi_spi_v2_write_block(phys, addr, &data, 1);
304 // pr_info("in function ____%s____ \n", __func__);
305
306 return (error == 1) ? 0 : error;
307}
308
309static int rmi_spi_v1_write_block(struct rmi_phys_device *phys, u16 addr,
310 u8 *buf, int len)
311{
312 struct rmi_spi_data *data = phys->data;
313 unsigned char txbuf[len + 2];
314 int error;
315 // pr_info("in function ____%s____ \n", __func__);
316
317 txbuf[0] = addr >> 8;
318 txbuf[1] = addr;
319 memcpy(txbuf+2, buf, len);
320
321 mutex_lock(&data->page_mutex);
322
323 if (RMI_SPI_PAGE(addr) != data->page) {
324 error = data->set_page(phys, RMI_SPI_PAGE(addr));
325 if (error < 0)
326 goto exit;
327 }
328
329 error = rmi_spi_xfer(phys, txbuf, len + 2, NULL, 0);
330 if (error < 0)
331 goto exit;
332 error = len;
333
334exit:
335 mutex_unlock(&data->page_mutex);
336 return error;
337}
338
339static int rmi_spi_v1_write(struct rmi_phys_device *phys, u16 addr, u8 data)
340{
341 int error = rmi_spi_v1_write_block(phys, addr, &data, 1);
342 // pr_info("in function ____%s____ \n", __func__);
343
344 return (error == 1) ? 0 : error;
345}
346
347static int rmi_spi_v2_split_read_block(struct rmi_phys_device *phys, u16 addr,
348 u8 *buf, int len)
349{
350 struct rmi_spi_data *data = phys->data;
351 u8 txbuf[4];
352 u8 rxbuf[len + 1]; /* one extra byte for read length */
353 int error;
354 // pr_info("in function ____%s____ \n", __func__);
355
356 txbuf[0] = SPI_V2_PREPARE_SPLIT_READ;
357 txbuf[1] = (addr >> 8) & 0x00FF;
358 txbuf[2] = addr & 0x00ff;
359 txbuf[3] = len;
360
361 mutex_lock(&data->page_mutex);
362
363 if (RMI_SPI_PAGE(addr) != data->page) {
364 error = data->set_page(phys, RMI_SPI_PAGE(addr));
365 if (error < 0)
366 goto exit;
367 }
368
369 data->split_read_pending = true;
370
371 error = rmi_spi_xfer(phys, txbuf, 4, NULL, 0);
372 if (error < 0) {
373 data->split_read_pending = false;
374 goto exit;
375 }
376
377 wait_for_completion(&data->irq_comp);
378
379 txbuf[0] = SPI_V2_EXECUTE_SPLIT_READ;
380 txbuf[1] = 0;
381
382 error = rmi_spi_xfer(phys, txbuf, 2, rxbuf, len + 1);
383 data->split_read_pending = false;
384 if (error < 0)
385 goto exit;
386
387 /* first byte is length */
388 if (rxbuf[0] != len) {
389 error = -EIO;
390 goto exit;
391 }
392
393 memcpy(buf, rxbuf + 1, len);
394 error = len;
395
396exit:
397 mutex_unlock(&data->page_mutex);
398 return error;
399}
400
401static int rmi_spi_v2_read_block(struct rmi_phys_device *phys, u16 addr,
402 u8 *buf, int len)
403{
404 struct rmi_spi_data *data = phys->data;
405 u8 txbuf[4];
406 int error;
407 // pr_info("in function ____%s____ \n", __func__);
408
409 txbuf[0] = SPI_V2_UNIFIED_READ;
410 txbuf[1] = (addr >> 8) & 0x00FF;
411 txbuf[2] = addr & 0x00ff;
412 txbuf[3] = len;
413
414 mutex_lock(&data->page_mutex);
415
416 if (RMI_SPI_PAGE(addr) != data->page) {
417 error = data->set_page(phys, RMI_SPI_PAGE(addr));
418 if (error < 0)
419 goto exit;
420 }
421
422 error = rmi_spi_xfer(phys, txbuf, 4, buf, len);
423 if (error < 0)
424 goto exit;
425 error = len;
426
427exit:
428 mutex_unlock(&data->page_mutex);
429 return error;
430}
431
432static int rmi_spi_v2_read(struct rmi_phys_device *phys, u16 addr, u8 *buf)
433{
434 int error = rmi_spi_v2_read_block(phys, addr, buf, 1);
435
436 return (error == 1) ? 0 : error;
437}
438
439static int rmi_spi_v1_read_block(struct rmi_phys_device *phys, u16 addr,
440 u8 *buf, int len)
441{
442 struct rmi_spi_data *data = phys->data;
443 u8 txbuf[2];
444 int error;
445 // pr_info("in function ____%s____ \n", __func__);
446
447 txbuf[0] = (addr >> 8) | RMI_V1_READ_FLAG;
448 txbuf[1] = addr;
449
450 mutex_lock(&data->page_mutex);
451
452 if (RMI_SPI_PAGE(addr) != data->page) {
453 error = data->set_page(phys, RMI_SPI_PAGE(addr));
454 if (error < 0)
455 goto exit;
456 }
457
458 error = rmi_spi_xfer(phys, txbuf, 2, buf, len);
459 // pr_info(" back in function %s, rmi_spi_xfer returned %d\n", __func__, error);
460
461 if (error < 0)
462 goto exit;
463 error = len;
464
465exit:
466 mutex_unlock(&data->page_mutex);
467 return error;
468}
469
470static int rmi_spi_v1_read(struct rmi_phys_device *phys, u16 addr, u8 *buf)
471{
472 int error = rmi_spi_v1_read_block(phys, addr, buf, 1);
473 pr_info("in function ____%s____ \n", __func__);
474
475 return (error == 1) ? 0 : error;
476}
477
478#define RMI_SPI_PAGE_SELECT_WRITE_LENGTH 1
479
480static int rmi_spi_v1_set_page(struct rmi_phys_device *phys, u8 page)
481{
482 struct rmi_spi_data *data = phys->data;
483 u8 txbuf[] = {RMI_PAGE_SELECT_REGISTER >> 8,
484 RMI_PAGE_SELECT_REGISTER & 0xFF, page};
485 int error;
486 pr_info("in function ____%s____ \n", __func__);
487
488 error = rmi_spi_xfer(phys, txbuf, sizeof(txbuf), NULL, 0);
489 if (error < 0) {
490 dev_err(phys->dev, "Failed to set page select, code: %d.\n",
491 error);
492 return error;
493 }
494
495 data->page = page;
496
497 return RMI_SPI_PAGE_SELECT_WRITE_LENGTH;
498}
499
500static int rmi_spi_v2_set_page(struct rmi_phys_device *phys, u8 page)
501{
502 struct rmi_spi_data *data = phys->data;
503
504 u8 txbuf[] = {SPI_V2_WRITE, RMI_PAGE_SELECT_REGISTER >> 8,
505 RMI_PAGE_SELECT_REGISTER & 0xFF,
506 RMI_SPI_PAGE_SELECT_WRITE_LENGTH, page};
507 int error;
508 pr_info("in function ____%s____ \n", __func__);
509
510 error = rmi_spi_xfer(phys, txbuf, sizeof(txbuf), NULL, 0);
511 if (error < 0) {
512 dev_err(phys->dev, "Failed to set page select, code: %d.\n",
513 error);
514 return error;
515 }
516
517 data->page = page;
518
519 return RMI_SPI_PAGE_SELECT_WRITE_LENGTH;
520}
521
522
523static int acquire_attn_irq(struct rmi_spi_data *data)
524{
525 int retval = 0;
526 pr_info("in function ____%s____ \n", __func__);
527 pr_info(" irq = %d\n", data->irq);
528 pr_info(" rmi_spi_hard_irq = 0x%8x\n", rmi_spi_hard_irq);
529 pr_info(" rmi_spi_irq_thread = 0x%8x\n", rmi_spi_irq_thread);
530 pr_info(" data->irq_flags = 0x%8x\n", data->irq_flags);
531 pr_info(" dev_name(data->phys->dev) = %s\n", dev_name(data->phys->dev));
532 pr_info(" data->phys = 0x%8x\n", data->phys);
533
534 retval = request_threaded_irq(data->irq, rmi_spi_hard_irq,
535 rmi_spi_irq_thread, data->irq_flags,
536 dev_name(data->phys->dev), data->phys);
537
538 pr_info(" retval = = %d\n", retval);
539 return retval;
540}
541
542static int enable_device(struct rmi_phys_device *phys)
543{
544 int retval = 0;
545
546 struct rmi_spi_data *data = phys->data;
547
548 if (data->enabled) {
549 dev_info(phys->dev, "Physical device already enabled.\n");
550 return 0;
551 }
552
553 retval = acquire_attn_irq(data);
554 if (retval)
555 goto error_exit;
556
557 data->enabled = true;
558 dev_info(phys->dev, "Physical device enabled.\n");
559 return 0;
560
561error_exit:
562 dev_err(phys->dev, "Failed to enable physical device. Code=%d.\n",
563 retval);
564 return retval;
565}
566
567
568static void disable_device(struct rmi_phys_device *phys)
569{
570 struct rmi_spi_data *data = phys->data;
571
572 pr_info("in function ____%s____ \n", __func__);
573 if (!data->enabled) {
574 dev_warn(phys->dev, "Physical device already disabled.\n");
575 return;
576 }
577 disable_irq(data->irq);
578 free_irq(data->irq, data->phys);
579
580 dev_info(phys->dev, "Physical device disabled.\n");
581 data->enabled = false;
582}
583
584
585
586#define DUMMY_READ_SLEEP_US 10
587
588static int rmi_spi_check_device(struct rmi_phys_device *rmi_phys)
589{
590 u8 buf[6];
591 int error;
592 int i;
593
594 pr_info("in function ____%s____ \n", __func__);
595
596 /* Some SPI subsystems return 0 for the very first read you do. So
597 * we use this dummy read to get that out of the way.
598 */
599 error = rmi_spi_v1_read_block(rmi_phys, PDT_START_SCAN_LOCATION,
600 buf, sizeof(buf));
601 if (error < 0) {
602 dev_err(rmi_phys->dev, "dummy read failed with %d.\n", error);
603 return error;
604 }
605 udelay(DUMMY_READ_SLEEP_US);
606
607 /* Force page select to 0.
608 */
609 error = rmi_spi_v1_set_page(rmi_phys, 0x00);
610 if (error < 0)
611 return error;
612
613 /* Now read the first PDT entry. We know where this is, and if the
614 * RMI4 device is out there, these 6 bytes will be something other
615 * than all 0x00 or 0xFF. We need to check for 0x00 and 0xFF,
616 * because many (maybe all) SPI implementations will return all 0x00
617 * or all 0xFF on read if the device is not connected.
618 */
619 error = rmi_spi_v1_read_block(rmi_phys, PDT_START_SCAN_LOCATION,
620 buf, sizeof(buf));
621 if (error < 0) {
622 dev_err(rmi_phys->dev, "probe read failed with %d.\n", error);
623 return error;
624 }
625
626 dev_info(rmi_phys->dev, "probe read succeeded with %d.\n", error);
627 for (i = 0; i < sizeof(buf); i++) {
628 if (buf[i] != 0x00 && buf[i] != 0xFF)
629 return error;
630 }
631
632 dev_err(rmi_phys->dev, "probe read returned invalid block.\n");
633 return -ENODEV;
634}
635
636static int __devinit rmi_spi_probe(struct spi_device *spi)
637{
638 struct rmi_phys_device *rmi_phys;
639 struct rmi_spi_data *data;
640 struct rmi_device_platform_data *pdata = spi->dev.platform_data;
641 u8 buf[2];
642 int error;
643
644 pr_info("%s: probe for rmi_spi device\n", __func__);
645
646 if (!pdata) {
647 dev_err(&spi->dev, "no platform data\n");
648 return -EINVAL;
649 }
650
651 if (spi->master->flags & SPI_MASTER_HALF_DUPLEX)
652 return -EINVAL;
653
654 spi->bits_per_word = 8;
655 spi->mode = SPI_MODE_3;
656 error = spi_setup(spi);
657 if (error < 0) {
658 dev_err(&spi->dev, "spi_setup failed!\n");
659 return error;
660 }
661
662 rmi_phys = kzalloc(sizeof(struct rmi_phys_device), GFP_KERNEL);
663 if (!rmi_phys)
664 return -ENOMEM;
665
666 data = kzalloc(sizeof(struct rmi_spi_data), GFP_KERNEL);
667 if (!data) {
668 error = -ENOMEM;
669 goto err_phys;
670 }
671 data->enabled = true; /* We plan to come up enabled. */
672 data->irq = gpio_to_irq(pdata->irq);
673 data->irq_flags = (pdata->irq_polarity == RMI_IRQ_ACTIVE_HIGH) ?
674 IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
675 data->phys = rmi_phys;
676
677 rmi_phys->data = data;
678 rmi_phys->dev = &spi->dev;
679
680 rmi_phys->write = rmi_spi_v1_write;
681 rmi_phys->write_block = rmi_spi_v1_write_block;
682 rmi_phys->read = rmi_spi_v1_read;
683 rmi_phys->read_block = rmi_spi_v1_read_block;
684 rmi_phys->enable_device = enable_device;
685 rmi_phys->disable_device = disable_device;
686 data->set_page = rmi_spi_v1_set_page;
687
688 rmi_phys->info.proto = spi_v1_proto_name;
689
690 mutex_init(&data->page_mutex);
691
692 pr_info("%s: setting the driverdata on the device\n", __func__);
693
694 dev_set_drvdata(&spi->dev, rmi_phys);
695
696 pr_info("%s: done setting driverdata %s\n", __func__, dev_name(&spi->dev));
697
698
699 pdata->spi_data.block_delay_us = pdata->spi_data.block_delay_us ?
700 pdata->spi_data.block_delay_us : RMI_SPI_BLOCK_DELAY_US;
701 pdata->spi_data.read_delay_us = pdata->spi_data.read_delay_us ?
702 pdata->spi_data.read_delay_us : RMI_SPI_BYTE_DELAY_US;
703 pdata->spi_data.write_delay_us = pdata->spi_data.write_delay_us ?
704 pdata->spi_data.write_delay_us : RMI_SPI_BYTE_DELAY_US;
705 pdata->spi_data.split_read_block_delay_us =
706 pdata->spi_data.split_read_block_delay_us ?
707 pdata->spi_data.split_read_block_delay_us :
708 RMI_SPI_BLOCK_DELAY_US;
709 pdata->spi_data.split_read_byte_delay_us =
710 pdata->spi_data.split_read_byte_delay_us ?
711 pdata->spi_data.split_read_byte_delay_us :
712 RMI_SPI_BYTE_DELAY_US;
713
714 pr_info("%s configuring GPIOs\n", __func__);
715
716 if (pdata->gpio_config) {
717 error = pdata->gpio_config(&spi->dev, true);
718 if (error < 0) {
719 dev_err(&spi->dev, "Failed to setup GPIOs, code: %d.\n",
720 error);
721 goto err_data;
722 }
723 }
724
725 error = rmi_spi_check_device(rmi_phys);
726 if (error < 0)
727 goto err_data;
728
729 /* check if this is an SPI v2 device */
730 dev_info(&spi->dev, "%s: checking SPI version on RMI device\n", __func__);
731 error = rmi_spi_v1_read_block(rmi_phys, RMI_PROTOCOL_VERSION_ADDRESS,
732 buf, 2);
733
734 if (error < 0) {
735 dev_info(&spi->dev, "failed to get SPI version number!\n");
736 dev_err(&spi->dev, "failed to get SPI version number!\n");
737 goto err_data;
738 }
739
740 dev_info(&spi->dev, "SPI version is %d", buf[0]);
741
742 if (buf[0] == 1) {
743 /* SPIv2 */
744 rmi_phys->write = rmi_spi_v2_write;
745 rmi_phys->write_block = rmi_spi_v2_write_block;
746 rmi_phys->read = rmi_spi_v2_read;
747 data->set_page = rmi_spi_v2_set_page;
748
749 rmi_phys->info.proto = spi_v2_proto_name;
750
751 if (pdata->irq > 0) {
752 init_completion(&data->irq_comp);
753 rmi_phys->read_block = rmi_spi_v2_split_read_block;
754 } else {
755 rmi_phys->read_block = rmi_spi_v2_read_block;
756 }
757 } else if (buf[0] != 0) {
758 dev_err(&spi->dev, "Unrecognized SPI version %d.\n", buf[0]);
759 error = -ENODEV;
760 goto err_data;
761 }
762
763 error = rmi_register_phys_device(rmi_phys);
764 if (error) {
765 dev_err(&spi->dev, "failed to register physical driver\n");
766 goto err_data;
767 }
768
769 if (pdata->irq > 0) {
770 error = acquire_attn_irq(data);
771 if (error < 0) {
772 dev_err(&spi->dev, "request_threaded_irq failed %d\n",
773 pdata->irq);
774 goto err_unregister;
775 }
776 }
777
778#if defined(CONFIG_RMI4_DEV)
779 pr_info(" CONFIG_RMI4_DEV is defined\n");
780
781 error = gpio_export(pdata->irq, false);
782 if (error) {
783 dev_warn(&spi->dev, "WARNING: Failed to export ATTN gpio!\n");
784 error = 0;
785 } else {
786 error = gpio_export_link(&(rmi_phys->rmi_dev->dev), "attn",
787 pdata->irq);
788 if (error) {
789 dev_warn(&(rmi_phys->rmi_dev->dev), "WARNING: "
790 "Failed to symlink ATTN gpio!\n");
791 error = 0;
792 } else {
793 dev_info(&(rmi_phys->rmi_dev->dev),
794 "%s: Exported GPIO %d.", __func__, pdata->irq);
795 }
796 }
797#endif /* CONFIG_RMI4_DEV */
798
799 dev_info(&spi->dev, "registered RMI SPI driver\n");
800 return 0;
801
802err_unregister:
803 rmi_unregister_phys_device(rmi_phys);
804err_data:
805 kfree(data);
806err_phys:
807 kfree(rmi_phys);
808 return error;
809}
810
811static int __devexit rmi_spi_remove(struct spi_device *spi)
812{
813 struct rmi_phys_device *phys = dev_get_drvdata(&spi->dev);
814 struct rmi_device_platform_data *pd = spi->dev.platform_data;
815 pr_info("in function ____%s____ \n", __func__);
816
817 rmi_unregister_phys_device(phys);
818 kfree(phys->data);
819 kfree(phys);
820
821 if (pd->gpio_config)
822 pd->gpio_config(&spi->dev, false);
823
824 return 0;
825}
826
827static const struct spi_device_id rmi_id[] = {
828 { "rmi", 0 },
829 { "rmi_spi", 0 },
830 { }
831};
832MODULE_DEVICE_TABLE(spi, rmi_id);
833
834static struct spi_driver rmi_spi_driver = {
835 .driver = {
836 .owner = THIS_MODULE,
837 .name = "rmi_spi",
838 //.mod_name = "rmi_spi",
839 //.bus = &spi_bus_type,
840 },
841 .id_table = rmi_id,
842 .probe = rmi_spi_probe,
843 .remove = __devexit_p(rmi_spi_remove),
844};
845
846static int __init rmi_spi_init(void)
847{
848 pr_info("%s: registering synaptics spi driver (ref=124)\n", __func__);
849 pr_info(" driver.owner = 0x%x\n", (unsigned int)rmi_spi_driver.driver.owner);
850 pr_info(" driver.name = %s\n", rmi_spi_driver.driver.name);
851 pr_info(" id_table[0].name = %s\n", rmi_spi_driver.id_table[0].name );
852 pr_info(" id_table[1].name = %s\n", rmi_spi_driver.id_table[1].name );
853 pr_info(" probe function ptr = 0x%x\n", (unsigned int)rmi_spi_driver.probe );
854
855
856 return spi_register_driver(&rmi_spi_driver);
857}
858
859static void __exit rmi_spi_exit(void)
860{
861 spi_unregister_driver(&rmi_spi_driver);
862}
863
864MODULE_AUTHOR("Christopher Heiny <cheiny@synaptics.com>");
865MODULE_DESCRIPTION("RMI SPI driver");
866MODULE_LICENSE("GPL");
867
868module_init(rmi_spi_init);
869module_exit(rmi_spi_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-26 02:36:15 -0500