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2b6a321d AD |
1 | /* |
2 | * Copyright (c) 2011-2016 Synaptics Incorporated | |
3 | * Copyright (c) 2011 Unixphere | |
4 | * | |
5 | * This driver provides the core support for a single RMI4-based device. | |
6 | * | |
7 | * The RMI4 specification can be found here (URL split for line length): | |
8 | * | |
9 | * http://www.synaptics.com/sites/default/files/ | |
10 | * 511-000136-01-Rev-E-RMI4-Interfacing-Guide.pdf | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License version 2 as published by | |
14 | * the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/bitmap.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/fs.h> | |
3aeed5b5 | 20 | #include <linux/irq.h> |
2b6a321d AD |
21 | #include <linux/kconfig.h> |
22 | #include <linux/pm.h> | |
23 | #include <linux/slab.h> | |
d8a8b3ed | 24 | #include <linux/of.h> |
2b6a321d AD |
25 | #include <uapi/linux/input.h> |
26 | #include <linux/rmi.h> | |
27 | #include "rmi_bus.h" | |
28 | #include "rmi_driver.h" | |
29 | ||
30 | #define HAS_NONSTANDARD_PDT_MASK 0x40 | |
31 | #define RMI4_MAX_PAGE 0xff | |
32 | #define RMI4_PAGE_SIZE 0x100 | |
33 | #define RMI4_PAGE_MASK 0xFF00 | |
34 | ||
35 | #define RMI_DEVICE_RESET_CMD 0x01 | |
36 | #define DEFAULT_RESET_DELAY_MS 100 | |
37 | ||
29fd0ec2 | 38 | void rmi_free_function_list(struct rmi_device *rmi_dev) |
2b6a321d AD |
39 | { |
40 | struct rmi_function *fn, *tmp; | |
41 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
42 | ||
6bd0dcfa ND |
43 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n"); |
44 | ||
29fd0ec2 ND |
45 | devm_kfree(&rmi_dev->dev, data->irq_memory); |
46 | data->irq_memory = NULL; | |
47 | data->irq_status = NULL; | |
48 | data->fn_irq_bits = NULL; | |
49 | data->current_irq_mask = NULL; | |
50 | data->new_irq_mask = NULL; | |
51 | ||
2b6a321d | 52 | data->f01_container = NULL; |
29fd0ec2 | 53 | data->f34_container = NULL; |
2b6a321d AD |
54 | |
55 | /* Doing it in the reverse order so F01 will be removed last */ | |
56 | list_for_each_entry_safe_reverse(fn, tmp, | |
57 | &data->function_list, node) { | |
58 | list_del(&fn->node); | |
59 | rmi_unregister_function(fn); | |
60 | } | |
61 | } | |
62 | ||
63 | static int reset_one_function(struct rmi_function *fn) | |
64 | { | |
65 | struct rmi_function_handler *fh; | |
66 | int retval = 0; | |
67 | ||
68 | if (!fn || !fn->dev.driver) | |
69 | return 0; | |
70 | ||
71 | fh = to_rmi_function_handler(fn->dev.driver); | |
72 | if (fh->reset) { | |
73 | retval = fh->reset(fn); | |
74 | if (retval < 0) | |
75 | dev_err(&fn->dev, "Reset failed with code %d.\n", | |
76 | retval); | |
77 | } | |
78 | ||
79 | return retval; | |
80 | } | |
81 | ||
82 | static int configure_one_function(struct rmi_function *fn) | |
83 | { | |
84 | struct rmi_function_handler *fh; | |
85 | int retval = 0; | |
86 | ||
87 | if (!fn || !fn->dev.driver) | |
88 | return 0; | |
89 | ||
90 | fh = to_rmi_function_handler(fn->dev.driver); | |
91 | if (fh->config) { | |
92 | retval = fh->config(fn); | |
93 | if (retval < 0) | |
94 | dev_err(&fn->dev, "Config failed with code %d.\n", | |
95 | retval); | |
96 | } | |
97 | ||
98 | return retval; | |
99 | } | |
100 | ||
101 | static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev) | |
102 | { | |
103 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
104 | struct rmi_function *entry; | |
105 | int retval; | |
106 | ||
107 | list_for_each_entry(entry, &data->function_list, node) { | |
108 | retval = reset_one_function(entry); | |
109 | if (retval < 0) | |
110 | return retval; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev) | |
117 | { | |
118 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
119 | struct rmi_function *entry; | |
120 | int retval; | |
121 | ||
122 | list_for_each_entry(entry, &data->function_list, node) { | |
123 | retval = configure_one_function(entry); | |
124 | if (retval < 0) | |
125 | return retval; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static void process_one_interrupt(struct rmi_driver_data *data, | |
132 | struct rmi_function *fn) | |
133 | { | |
134 | struct rmi_function_handler *fh; | |
135 | ||
136 | if (!fn || !fn->dev.driver) | |
137 | return; | |
138 | ||
139 | fh = to_rmi_function_handler(fn->dev.driver); | |
a1376d3d | 140 | if (fh->attention) { |
2b6a321d AD |
141 | bitmap_and(data->fn_irq_bits, data->irq_status, fn->irq_mask, |
142 | data->irq_count); | |
143 | if (!bitmap_empty(data->fn_irq_bits, data->irq_count)) | |
144 | fh->attention(fn, data->fn_irq_bits); | |
145 | } | |
146 | } | |
147 | ||
3aeed5b5 | 148 | static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev) |
2b6a321d AD |
149 | { |
150 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
151 | struct device *dev = &rmi_dev->dev; | |
152 | struct rmi_function *entry; | |
153 | int error; | |
154 | ||
155 | if (!data) | |
156 | return 0; | |
157 | ||
ae9979c3 | 158 | if (!data->attn_data.data) { |
2b6a321d AD |
159 | error = rmi_read_block(rmi_dev, |
160 | data->f01_container->fd.data_base_addr + 1, | |
161 | data->irq_status, data->num_of_irq_regs); | |
162 | if (error < 0) { | |
163 | dev_err(dev, "Failed to read irqs, code=%d\n", error); | |
164 | return error; | |
165 | } | |
166 | } | |
167 | ||
e155d4ee | 168 | mutex_lock(&data->irq_mutex); |
2b6a321d AD |
169 | bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask, |
170 | data->irq_count); | |
e155d4ee BT |
171 | /* |
172 | * At this point, irq_status has all bits that are set in the | |
173 | * interrupt status register and are enabled. | |
174 | */ | |
175 | mutex_unlock(&data->irq_mutex); | |
2b6a321d AD |
176 | |
177 | /* | |
178 | * It would be nice to be able to use irq_chip to handle these | |
179 | * nested IRQs. Unfortunately, most of the current customers for | |
180 | * this driver are using older kernels (3.0.x) that don't support | |
181 | * the features required for that. Once they've shifted to more | |
182 | * recent kernels (say, 3.3 and higher), this should be switched to | |
183 | * use irq_chip. | |
184 | */ | |
185 | list_for_each_entry(entry, &data->function_list, node) | |
a1376d3d | 186 | process_one_interrupt(data, entry); |
2b6a321d AD |
187 | |
188 | if (data->input) | |
189 | input_sync(data->input); | |
190 | ||
191 | return 0; | |
192 | } | |
3aeed5b5 | 193 | |
b908d3cd BT |
194 | void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status, |
195 | void *data, size_t size) | |
196 | { | |
197 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); | |
198 | struct rmi4_attn_data attn_data; | |
199 | void *fifo_data; | |
200 | ||
201 | if (!drvdata->enabled) | |
202 | return; | |
203 | ||
204 | fifo_data = kmemdup(data, size, GFP_ATOMIC); | |
205 | if (!fifo_data) | |
206 | return; | |
207 | ||
208 | attn_data.irq_status = irq_status; | |
209 | attn_data.size = size; | |
210 | attn_data.data = fifo_data; | |
211 | ||
212 | kfifo_put(&drvdata->attn_fifo, attn_data); | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(rmi_set_attn_data); | |
215 | ||
3aeed5b5 BA |
216 | static irqreturn_t rmi_irq_fn(int irq, void *dev_id) |
217 | { | |
218 | struct rmi_device *rmi_dev = dev_id; | |
b908d3cd BT |
219 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); |
220 | struct rmi4_attn_data attn_data = {0}; | |
221 | int ret, count; | |
222 | ||
223 | count = kfifo_get(&drvdata->attn_fifo, &attn_data); | |
224 | if (count) { | |
225 | *(drvdata->irq_status) = attn_data.irq_status; | |
ae9979c3 | 226 | drvdata->attn_data = attn_data; |
b908d3cd | 227 | } |
3aeed5b5 BA |
228 | |
229 | ret = rmi_process_interrupt_requests(rmi_dev); | |
230 | if (ret) | |
231 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, | |
232 | "Failed to process interrupt request: %d\n", ret); | |
233 | ||
b908d3cd BT |
234 | if (count) |
235 | kfree(attn_data.data); | |
236 | ||
237 | if (!kfifo_is_empty(&drvdata->attn_fifo)) | |
238 | return rmi_irq_fn(irq, dev_id); | |
239 | ||
3aeed5b5 BA |
240 | return IRQ_HANDLED; |
241 | } | |
242 | ||
243 | static int rmi_irq_init(struct rmi_device *rmi_dev) | |
244 | { | |
245 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
a64ea311 | 246 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 BA |
247 | int irq_flags = irq_get_trigger_type(pdata->irq); |
248 | int ret; | |
249 | ||
250 | if (!irq_flags) | |
251 | irq_flags = IRQF_TRIGGER_LOW; | |
252 | ||
253 | ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL, | |
254 | rmi_irq_fn, irq_flags | IRQF_ONESHOT, | |
255 | dev_name(rmi_dev->xport->dev), | |
256 | rmi_dev); | |
257 | if (ret < 0) { | |
258 | dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n", | |
259 | pdata->irq); | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
a64ea311 BT |
264 | data->enabled = true; |
265 | ||
3aeed5b5 BA |
266 | return 0; |
267 | } | |
2b6a321d AD |
268 | |
269 | static int suspend_one_function(struct rmi_function *fn) | |
270 | { | |
271 | struct rmi_function_handler *fh; | |
272 | int retval = 0; | |
273 | ||
274 | if (!fn || !fn->dev.driver) | |
275 | return 0; | |
276 | ||
277 | fh = to_rmi_function_handler(fn->dev.driver); | |
278 | if (fh->suspend) { | |
279 | retval = fh->suspend(fn); | |
280 | if (retval < 0) | |
281 | dev_err(&fn->dev, "Suspend failed with code %d.\n", | |
282 | retval); | |
283 | } | |
284 | ||
285 | return retval; | |
286 | } | |
287 | ||
288 | static int rmi_suspend_functions(struct rmi_device *rmi_dev) | |
289 | { | |
290 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
291 | struct rmi_function *entry; | |
292 | int retval; | |
293 | ||
294 | list_for_each_entry(entry, &data->function_list, node) { | |
295 | retval = suspend_one_function(entry); | |
e155d4ee | 296 | if (retval < 0) |
2b6a321d AD |
297 | return retval; |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int resume_one_function(struct rmi_function *fn) | |
304 | { | |
305 | struct rmi_function_handler *fh; | |
306 | int retval = 0; | |
307 | ||
308 | if (!fn || !fn->dev.driver) | |
309 | return 0; | |
310 | ||
311 | fh = to_rmi_function_handler(fn->dev.driver); | |
312 | if (fh->resume) { | |
313 | retval = fh->resume(fn); | |
314 | if (retval < 0) | |
315 | dev_err(&fn->dev, "Resume failed with code %d.\n", | |
316 | retval); | |
317 | } | |
318 | ||
319 | return retval; | |
320 | } | |
321 | ||
322 | static int rmi_resume_functions(struct rmi_device *rmi_dev) | |
323 | { | |
324 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
325 | struct rmi_function *entry; | |
326 | int retval; | |
327 | ||
328 | list_for_each_entry(entry, &data->function_list, node) { | |
329 | retval = resume_one_function(entry); | |
e155d4ee | 330 | if (retval < 0) |
2b6a321d AD |
331 | return retval; |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
29fd0ec2 | 337 | int rmi_enable_sensor(struct rmi_device *rmi_dev) |
2b6a321d AD |
338 | { |
339 | int retval = 0; | |
340 | ||
341 | retval = rmi_driver_process_config_requests(rmi_dev); | |
342 | if (retval < 0) | |
343 | return retval; | |
344 | ||
345 | return rmi_process_interrupt_requests(rmi_dev); | |
346 | } | |
347 | ||
348 | /** | |
349 | * rmi_driver_set_input_params - set input device id and other data. | |
350 | * | |
351 | * @rmi_dev: Pointer to an RMI device | |
352 | * @input: Pointer to input device | |
353 | * | |
354 | */ | |
355 | static int rmi_driver_set_input_params(struct rmi_device *rmi_dev, | |
356 | struct input_dev *input) | |
357 | { | |
358 | input->name = SYNAPTICS_INPUT_DEVICE_NAME; | |
359 | input->id.vendor = SYNAPTICS_VENDOR_ID; | |
360 | input->id.bustype = BUS_RMI; | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static void rmi_driver_set_input_name(struct rmi_device *rmi_dev, | |
365 | struct input_dev *input) | |
366 | { | |
367 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
ce363f0d | 368 | const char *device_name = rmi_f01_get_product_ID(data->f01_container); |
2b6a321d AD |
369 | char *name; |
370 | ||
371 | name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL, | |
372 | "Synaptics %s", device_name); | |
373 | if (!name) | |
374 | return; | |
375 | ||
376 | input->name = name; | |
377 | } | |
378 | ||
379 | static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev, | |
380 | unsigned long *mask) | |
381 | { | |
382 | int error = 0; | |
383 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
384 | struct device *dev = &rmi_dev->dev; | |
385 | ||
386 | mutex_lock(&data->irq_mutex); | |
387 | bitmap_or(data->new_irq_mask, | |
388 | data->current_irq_mask, mask, data->irq_count); | |
389 | ||
390 | error = rmi_write_block(rmi_dev, | |
391 | data->f01_container->fd.control_base_addr + 1, | |
392 | data->new_irq_mask, data->num_of_irq_regs); | |
393 | if (error < 0) { | |
394 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
395 | __func__); | |
396 | goto error_unlock; | |
397 | } | |
398 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
399 | data->num_of_irq_regs); | |
400 | ||
401 | error_unlock: | |
402 | mutex_unlock(&data->irq_mutex); | |
403 | return error; | |
404 | } | |
405 | ||
406 | static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev, | |
407 | unsigned long *mask) | |
408 | { | |
409 | int error = 0; | |
410 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
411 | struct device *dev = &rmi_dev->dev; | |
412 | ||
413 | mutex_lock(&data->irq_mutex); | |
414 | bitmap_andnot(data->new_irq_mask, | |
415 | data->current_irq_mask, mask, data->irq_count); | |
416 | ||
417 | error = rmi_write_block(rmi_dev, | |
418 | data->f01_container->fd.control_base_addr + 1, | |
419 | data->new_irq_mask, data->num_of_irq_regs); | |
420 | if (error < 0) { | |
421 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
422 | __func__); | |
423 | goto error_unlock; | |
424 | } | |
425 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
426 | data->num_of_irq_regs); | |
427 | ||
428 | error_unlock: | |
429 | mutex_unlock(&data->irq_mutex); | |
430 | return error; | |
431 | } | |
432 | ||
433 | static int rmi_driver_reset_handler(struct rmi_device *rmi_dev) | |
434 | { | |
435 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
436 | int error; | |
437 | ||
438 | /* | |
439 | * Can get called before the driver is fully ready to deal with | |
440 | * this situation. | |
441 | */ | |
442 | if (!data || !data->f01_container) { | |
443 | dev_warn(&rmi_dev->dev, | |
444 | "Not ready to handle reset yet!\n"); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | error = rmi_read_block(rmi_dev, | |
449 | data->f01_container->fd.control_base_addr + 1, | |
450 | data->current_irq_mask, data->num_of_irq_regs); | |
451 | if (error < 0) { | |
452 | dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n", | |
453 | __func__); | |
454 | return error; | |
455 | } | |
456 | ||
457 | error = rmi_driver_process_reset_requests(rmi_dev); | |
458 | if (error < 0) | |
459 | return error; | |
460 | ||
461 | error = rmi_driver_process_config_requests(rmi_dev); | |
462 | if (error < 0) | |
463 | return error; | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
e9dade41 BT |
468 | static int rmi_read_pdt_entry(struct rmi_device *rmi_dev, |
469 | struct pdt_entry *entry, u16 pdt_address) | |
2b6a321d AD |
470 | { |
471 | u8 buf[RMI_PDT_ENTRY_SIZE]; | |
472 | int error; | |
473 | ||
474 | error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE); | |
475 | if (error) { | |
476 | dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n", | |
477 | pdt_address, error); | |
478 | return error; | |
479 | } | |
480 | ||
481 | entry->page_start = pdt_address & RMI4_PAGE_MASK; | |
482 | entry->query_base_addr = buf[0]; | |
483 | entry->command_base_addr = buf[1]; | |
484 | entry->control_base_addr = buf[2]; | |
485 | entry->data_base_addr = buf[3]; | |
486 | entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK; | |
487 | entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5; | |
488 | entry->function_number = buf[5]; | |
489 | ||
490 | return 0; | |
491 | } | |
2b6a321d AD |
492 | |
493 | static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt, | |
494 | struct rmi_function_descriptor *fd) | |
495 | { | |
496 | fd->query_base_addr = pdt->query_base_addr + pdt->page_start; | |
497 | fd->command_base_addr = pdt->command_base_addr + pdt->page_start; | |
498 | fd->control_base_addr = pdt->control_base_addr + pdt->page_start; | |
499 | fd->data_base_addr = pdt->data_base_addr + pdt->page_start; | |
500 | fd->function_number = pdt->function_number; | |
501 | fd->interrupt_source_count = pdt->interrupt_source_count; | |
502 | fd->function_version = pdt->function_version; | |
503 | } | |
504 | ||
505 | #define RMI_SCAN_CONTINUE 0 | |
506 | #define RMI_SCAN_DONE 1 | |
507 | ||
508 | static int rmi_scan_pdt_page(struct rmi_device *rmi_dev, | |
509 | int page, | |
ad338e8b | 510 | int *empty_pages, |
2b6a321d AD |
511 | void *ctx, |
512 | int (*callback)(struct rmi_device *rmi_dev, | |
513 | void *ctx, | |
514 | const struct pdt_entry *entry)) | |
515 | { | |
516 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
517 | struct pdt_entry pdt_entry; | |
518 | u16 page_start = RMI4_PAGE_SIZE * page; | |
519 | u16 pdt_start = page_start + PDT_START_SCAN_LOCATION; | |
520 | u16 pdt_end = page_start + PDT_END_SCAN_LOCATION; | |
521 | u16 addr; | |
522 | int error; | |
523 | int retval; | |
524 | ||
525 | for (addr = pdt_start; addr >= pdt_end; addr -= RMI_PDT_ENTRY_SIZE) { | |
526 | error = rmi_read_pdt_entry(rmi_dev, &pdt_entry, addr); | |
527 | if (error) | |
528 | return error; | |
529 | ||
530 | if (RMI4_END_OF_PDT(pdt_entry.function_number)) | |
531 | break; | |
532 | ||
533 | retval = callback(rmi_dev, ctx, &pdt_entry); | |
534 | if (retval != RMI_SCAN_CONTINUE) | |
535 | return retval; | |
536 | } | |
537 | ||
ad338e8b ND |
538 | /* |
539 | * Count number of empty PDT pages. If a gap of two pages | |
540 | * or more is found, stop scanning. | |
541 | */ | |
542 | if (addr == pdt_start) | |
543 | ++*empty_pages; | |
544 | else | |
545 | *empty_pages = 0; | |
546 | ||
5191d88a | 547 | return (data->bootloader_mode || *empty_pages >= 2) ? |
2b6a321d AD |
548 | RMI_SCAN_DONE : RMI_SCAN_CONTINUE; |
549 | } | |
550 | ||
29fd0ec2 ND |
551 | int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx, |
552 | int (*callback)(struct rmi_device *rmi_dev, | |
553 | void *ctx, const struct pdt_entry *entry)) | |
2b6a321d AD |
554 | { |
555 | int page; | |
ad338e8b | 556 | int empty_pages = 0; |
2b6a321d AD |
557 | int retval = RMI_SCAN_DONE; |
558 | ||
559 | for (page = 0; page <= RMI4_MAX_PAGE; page++) { | |
ad338e8b ND |
560 | retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages, |
561 | ctx, callback); | |
2b6a321d AD |
562 | if (retval != RMI_SCAN_CONTINUE) |
563 | break; | |
564 | } | |
565 | ||
566 | return retval < 0 ? retval : 0; | |
567 | } | |
568 | ||
569 | int rmi_read_register_desc(struct rmi_device *d, u16 addr, | |
570 | struct rmi_register_descriptor *rdesc) | |
571 | { | |
572 | int ret; | |
573 | u8 size_presence_reg; | |
574 | u8 buf[35]; | |
575 | int presense_offset = 1; | |
576 | u8 *struct_buf; | |
577 | int reg; | |
578 | int offset = 0; | |
579 | int map_offset = 0; | |
580 | int i; | |
581 | int b; | |
582 | ||
583 | /* | |
584 | * The first register of the register descriptor is the size of | |
585 | * the register descriptor's presense register. | |
586 | */ | |
587 | ret = rmi_read(d, addr, &size_presence_reg); | |
588 | if (ret) | |
589 | return ret; | |
590 | ++addr; | |
591 | ||
592 | if (size_presence_reg < 0 || size_presence_reg > 35) | |
593 | return -EIO; | |
594 | ||
595 | memset(buf, 0, sizeof(buf)); | |
596 | ||
597 | /* | |
598 | * The presence register contains the size of the register structure | |
599 | * and a bitmap which identified which packet registers are present | |
600 | * for this particular register type (ie query, control, or data). | |
601 | */ | |
602 | ret = rmi_read_block(d, addr, buf, size_presence_reg); | |
603 | if (ret) | |
604 | return ret; | |
605 | ++addr; | |
606 | ||
607 | if (buf[0] == 0) { | |
608 | presense_offset = 3; | |
609 | rdesc->struct_size = buf[1] | (buf[2] << 8); | |
610 | } else { | |
611 | rdesc->struct_size = buf[0]; | |
612 | } | |
613 | ||
614 | for (i = presense_offset; i < size_presence_reg; i++) { | |
615 | for (b = 0; b < 8; b++) { | |
616 | if (buf[i] & (0x1 << b)) | |
617 | bitmap_set(rdesc->presense_map, map_offset, 1); | |
618 | ++map_offset; | |
619 | } | |
620 | } | |
621 | ||
622 | rdesc->num_registers = bitmap_weight(rdesc->presense_map, | |
623 | RMI_REG_DESC_PRESENSE_BITS); | |
624 | ||
625 | rdesc->registers = devm_kzalloc(&d->dev, rdesc->num_registers * | |
626 | sizeof(struct rmi_register_desc_item), | |
627 | GFP_KERNEL); | |
628 | if (!rdesc->registers) | |
629 | return -ENOMEM; | |
630 | ||
631 | /* | |
632 | * Allocate a temporary buffer to hold the register structure. | |
633 | * I'm not using devm_kzalloc here since it will not be retained | |
634 | * after exiting this function | |
635 | */ | |
636 | struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL); | |
637 | if (!struct_buf) | |
638 | return -ENOMEM; | |
639 | ||
640 | /* | |
641 | * The register structure contains information about every packet | |
642 | * register of this type. This includes the size of the packet | |
643 | * register and a bitmap of all subpackets contained in the packet | |
644 | * register. | |
645 | */ | |
646 | ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size); | |
647 | if (ret) | |
648 | goto free_struct_buff; | |
649 | ||
650 | reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS); | |
2b6a321d AD |
651 | for (i = 0; i < rdesc->num_registers; i++) { |
652 | struct rmi_register_desc_item *item = &rdesc->registers[i]; | |
653 | int reg_size = struct_buf[offset]; | |
654 | ||
655 | ++offset; | |
656 | if (reg_size == 0) { | |
657 | reg_size = struct_buf[offset] | | |
658 | (struct_buf[offset + 1] << 8); | |
659 | offset += 2; | |
660 | } | |
661 | ||
662 | if (reg_size == 0) { | |
663 | reg_size = struct_buf[offset] | | |
664 | (struct_buf[offset + 1] << 8) | | |
665 | (struct_buf[offset + 2] << 16) | | |
666 | (struct_buf[offset + 3] << 24); | |
667 | offset += 4; | |
668 | } | |
669 | ||
670 | item->reg = reg; | |
671 | item->reg_size = reg_size; | |
672 | ||
3e29d6bb AD |
673 | map_offset = 0; |
674 | ||
2b6a321d AD |
675 | do { |
676 | for (b = 0; b < 7; b++) { | |
677 | if (struct_buf[offset] & (0x1 << b)) | |
678 | bitmap_set(item->subpacket_map, | |
679 | map_offset, 1); | |
680 | ++map_offset; | |
681 | } | |
682 | } while (struct_buf[offset++] & 0x80); | |
683 | ||
684 | item->num_subpackets = bitmap_weight(item->subpacket_map, | |
685 | RMI_REG_DESC_SUBPACKET_BITS); | |
686 | ||
687 | rmi_dbg(RMI_DEBUG_CORE, &d->dev, | |
688 | "%s: reg: %d reg size: %ld subpackets: %d\n", __func__, | |
689 | item->reg, item->reg_size, item->num_subpackets); | |
690 | ||
691 | reg = find_next_bit(rdesc->presense_map, | |
692 | RMI_REG_DESC_PRESENSE_BITS, reg + 1); | |
693 | } | |
694 | ||
695 | free_struct_buff: | |
696 | kfree(struct_buf); | |
697 | return ret; | |
698 | } | |
2b6a321d AD |
699 | |
700 | const struct rmi_register_desc_item *rmi_get_register_desc_item( | |
701 | struct rmi_register_descriptor *rdesc, u16 reg) | |
702 | { | |
703 | const struct rmi_register_desc_item *item; | |
704 | int i; | |
705 | ||
706 | for (i = 0; i < rdesc->num_registers; i++) { | |
707 | item = &rdesc->registers[i]; | |
708 | if (item->reg == reg) | |
709 | return item; | |
710 | } | |
711 | ||
712 | return NULL; | |
713 | } | |
2b6a321d AD |
714 | |
715 | size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc) | |
716 | { | |
717 | const struct rmi_register_desc_item *item; | |
718 | int i; | |
719 | size_t size = 0; | |
720 | ||
721 | for (i = 0; i < rdesc->num_registers; i++) { | |
722 | item = &rdesc->registers[i]; | |
723 | size += item->reg_size; | |
724 | } | |
725 | return size; | |
726 | } | |
2b6a321d AD |
727 | |
728 | /* Compute the register offset relative to the base address */ | |
729 | int rmi_register_desc_calc_reg_offset( | |
730 | struct rmi_register_descriptor *rdesc, u16 reg) | |
731 | { | |
732 | const struct rmi_register_desc_item *item; | |
733 | int offset = 0; | |
734 | int i; | |
735 | ||
736 | for (i = 0; i < rdesc->num_registers; i++) { | |
737 | item = &rdesc->registers[i]; | |
738 | if (item->reg == reg) | |
739 | return offset; | |
740 | ++offset; | |
741 | } | |
742 | return -1; | |
743 | } | |
2b6a321d AD |
744 | |
745 | bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item, | |
746 | u8 subpacket) | |
747 | { | |
748 | return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS, | |
749 | subpacket) == subpacket; | |
750 | } | |
751 | ||
2b6a321d AD |
752 | static int rmi_check_bootloader_mode(struct rmi_device *rmi_dev, |
753 | const struct pdt_entry *pdt) | |
754 | { | |
5191d88a ND |
755 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
756 | int ret; | |
757 | u8 status; | |
2b6a321d | 758 | |
5191d88a ND |
759 | if (pdt->function_number == 0x34 && pdt->function_version > 1) { |
760 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
761 | if (ret) { | |
762 | dev_err(&rmi_dev->dev, | |
763 | "Failed to read F34 status: %d.\n", ret); | |
764 | return ret; | |
765 | } | |
766 | ||
767 | if (status & BIT(7)) | |
768 | data->bootloader_mode = true; | |
769 | } else if (pdt->function_number == 0x01) { | |
770 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
771 | if (ret) { | |
772 | dev_err(&rmi_dev->dev, | |
773 | "Failed to read F01 status: %d.\n", ret); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | if (status & BIT(6)) | |
778 | data->bootloader_mode = true; | |
2b6a321d AD |
779 | } |
780 | ||
5191d88a | 781 | return 0; |
2b6a321d AD |
782 | } |
783 | ||
784 | static int rmi_count_irqs(struct rmi_device *rmi_dev, | |
785 | void *ctx, const struct pdt_entry *pdt) | |
786 | { | |
2b6a321d | 787 | int *irq_count = ctx; |
5191d88a | 788 | int ret; |
2b6a321d AD |
789 | |
790 | *irq_count += pdt->interrupt_source_count; | |
5191d88a ND |
791 | |
792 | ret = rmi_check_bootloader_mode(rmi_dev, pdt); | |
793 | if (ret < 0) | |
794 | return ret; | |
2b6a321d AD |
795 | |
796 | return RMI_SCAN_CONTINUE; | |
797 | } | |
798 | ||
29fd0ec2 ND |
799 | int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx, |
800 | const struct pdt_entry *pdt) | |
2b6a321d AD |
801 | { |
802 | int error; | |
803 | ||
804 | if (pdt->function_number == 0x01) { | |
805 | u16 cmd_addr = pdt->page_start + pdt->command_base_addr; | |
806 | u8 cmd_buf = RMI_DEVICE_RESET_CMD; | |
807 | const struct rmi_device_platform_data *pdata = | |
808 | rmi_get_platform_data(rmi_dev); | |
809 | ||
810 | if (rmi_dev->xport->ops->reset) { | |
811 | error = rmi_dev->xport->ops->reset(rmi_dev->xport, | |
812 | cmd_addr); | |
813 | if (error) | |
814 | return error; | |
815 | ||
816 | return RMI_SCAN_DONE; | |
817 | } | |
818 | ||
8029a283 | 819 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n"); |
2b6a321d AD |
820 | error = rmi_write_block(rmi_dev, cmd_addr, &cmd_buf, 1); |
821 | if (error) { | |
822 | dev_err(&rmi_dev->dev, | |
823 | "Initial reset failed. Code = %d.\n", error); | |
824 | return error; | |
825 | } | |
826 | ||
827 | mdelay(pdata->reset_delay_ms ?: DEFAULT_RESET_DELAY_MS); | |
828 | ||
829 | return RMI_SCAN_DONE; | |
830 | } | |
831 | ||
832 | /* F01 should always be on page 0. If we don't find it there, fail. */ | |
833 | return pdt->page_start == 0 ? RMI_SCAN_CONTINUE : -ENODEV; | |
834 | } | |
835 | ||
836 | static int rmi_create_function(struct rmi_device *rmi_dev, | |
837 | void *ctx, const struct pdt_entry *pdt) | |
838 | { | |
839 | struct device *dev = &rmi_dev->dev; | |
ed77bdf4 | 840 | struct rmi_driver_data *data = dev_get_drvdata(dev); |
2b6a321d AD |
841 | int *current_irq_count = ctx; |
842 | struct rmi_function *fn; | |
843 | int i; | |
844 | int error; | |
845 | ||
846 | rmi_dbg(RMI_DEBUG_CORE, dev, "Initializing F%02X.\n", | |
847 | pdt->function_number); | |
848 | ||
849 | fn = kzalloc(sizeof(struct rmi_function) + | |
850 | BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long), | |
851 | GFP_KERNEL); | |
852 | if (!fn) { | |
853 | dev_err(dev, "Failed to allocate memory for F%02X\n", | |
854 | pdt->function_number); | |
855 | return -ENOMEM; | |
856 | } | |
857 | ||
858 | INIT_LIST_HEAD(&fn->node); | |
859 | rmi_driver_copy_pdt_to_fd(pdt, &fn->fd); | |
860 | ||
861 | fn->rmi_dev = rmi_dev; | |
862 | ||
863 | fn->num_of_irqs = pdt->interrupt_source_count; | |
864 | fn->irq_pos = *current_irq_count; | |
865 | *current_irq_count += fn->num_of_irqs; | |
866 | ||
867 | for (i = 0; i < fn->num_of_irqs; i++) | |
868 | set_bit(fn->irq_pos + i, fn->irq_mask); | |
869 | ||
870 | error = rmi_register_function(fn); | |
871 | if (error) | |
872 | goto err_put_fn; | |
873 | ||
874 | if (pdt->function_number == 0x01) | |
875 | data->f01_container = fn; | |
29fd0ec2 ND |
876 | else if (pdt->function_number == 0x34) |
877 | data->f34_container = fn; | |
2b6a321d AD |
878 | |
879 | list_add_tail(&fn->node, &data->function_list); | |
880 | ||
881 | return RMI_SCAN_CONTINUE; | |
882 | ||
883 | err_put_fn: | |
884 | put_device(&fn->dev); | |
885 | return error; | |
886 | } | |
887 | ||
a64ea311 | 888 | void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d | 889 | { |
3aeed5b5 | 890 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); |
a64ea311 | 891 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 | 892 | int irq = pdata->irq; |
a64ea311 BT |
893 | int irq_flags; |
894 | int retval; | |
2b6a321d | 895 | |
a64ea311 BT |
896 | mutex_lock(&data->enabled_mutex); |
897 | ||
898 | if (data->enabled) | |
899 | goto out; | |
900 | ||
901 | enable_irq(irq); | |
902 | data->enabled = true; | |
903 | if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
904 | retval = disable_irq_wake(irq); | |
905 | if (!retval) | |
906 | dev_warn(&rmi_dev->dev, | |
907 | "Failed to disable irq for wake: %d\n", | |
908 | retval); | |
909 | } | |
910 | ||
911 | /* | |
912 | * Call rmi_process_interrupt_requests() after enabling irq, | |
913 | * otherwise we may lose interrupt on edge-triggered systems. | |
914 | */ | |
915 | irq_flags = irq_get_trigger_type(pdata->irq); | |
916 | if (irq_flags & IRQ_TYPE_EDGE_BOTH) | |
917 | rmi_process_interrupt_requests(rmi_dev); | |
918 | ||
919 | out: | |
920 | mutex_unlock(&data->enabled_mutex); | |
921 | } | |
922 | ||
923 | void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake) | |
924 | { | |
925 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
926 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
b908d3cd | 927 | struct rmi4_attn_data attn_data = {0}; |
a64ea311 | 928 | int irq = pdata->irq; |
b908d3cd | 929 | int retval, count; |
a64ea311 BT |
930 | |
931 | mutex_lock(&data->enabled_mutex); | |
932 | ||
933 | if (!data->enabled) | |
934 | goto out; | |
2b6a321d | 935 | |
a64ea311 | 936 | data->enabled = false; |
3aeed5b5 BA |
937 | disable_irq(irq); |
938 | if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
939 | retval = enable_irq_wake(irq); | |
940 | if (!retval) | |
941 | dev_warn(&rmi_dev->dev, | |
942 | "Failed to enable irq for wake: %d\n", | |
943 | retval); | |
944 | } | |
a64ea311 | 945 | |
b908d3cd BT |
946 | /* make sure the fifo is clean */ |
947 | while (!kfifo_is_empty(&data->attn_fifo)) { | |
948 | count = kfifo_get(&data->attn_fifo, &attn_data); | |
949 | if (count) | |
950 | kfree(attn_data.data); | |
951 | } | |
952 | ||
a64ea311 BT |
953 | out: |
954 | mutex_unlock(&data->enabled_mutex); | |
955 | } | |
956 | ||
957 | int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake) | |
958 | { | |
959 | int retval; | |
960 | ||
961 | retval = rmi_suspend_functions(rmi_dev); | |
962 | if (retval) | |
963 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
964 | retval); | |
965 | ||
966 | rmi_disable_irq(rmi_dev, enable_wake); | |
2b6a321d AD |
967 | return retval; |
968 | } | |
969 | EXPORT_SYMBOL_GPL(rmi_driver_suspend); | |
970 | ||
3aeed5b5 | 971 | int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d AD |
972 | { |
973 | int retval; | |
974 | ||
a64ea311 | 975 | rmi_enable_irq(rmi_dev, clear_wake); |
3aeed5b5 | 976 | |
2b6a321d AD |
977 | retval = rmi_resume_functions(rmi_dev); |
978 | if (retval) | |
979 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
980 | retval); | |
981 | ||
982 | return retval; | |
983 | } | |
984 | EXPORT_SYMBOL_GPL(rmi_driver_resume); | |
985 | ||
986 | static int rmi_driver_remove(struct device *dev) | |
987 | { | |
988 | struct rmi_device *rmi_dev = to_rmi_device(dev); | |
3aeed5b5 | 989 | |
a64ea311 | 990 | rmi_disable_irq(rmi_dev, false); |
2b6a321d | 991 | |
29fd0ec2 | 992 | rmi_f34_remove_sysfs(rmi_dev); |
2b6a321d AD |
993 | rmi_free_function_list(rmi_dev); |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
d8a8b3ed AD |
998 | #ifdef CONFIG_OF |
999 | static int rmi_driver_of_probe(struct device *dev, | |
1000 | struct rmi_device_platform_data *pdata) | |
1001 | { | |
1002 | int retval; | |
1003 | ||
1004 | retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms, | |
1005 | "syna,reset-delay-ms", 1); | |
1006 | if (retval) | |
1007 | return retval; | |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | #else | |
1012 | static inline int rmi_driver_of_probe(struct device *dev, | |
1013 | struct rmi_device_platform_data *pdata) | |
1014 | { | |
1015 | return -ENODEV; | |
1016 | } | |
1017 | #endif | |
1018 | ||
29fd0ec2 | 1019 | int rmi_probe_interrupts(struct rmi_driver_data *data) |
6bd0dcfa ND |
1020 | { |
1021 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1022 | struct device *dev = &rmi_dev->dev; | |
1023 | int irq_count; | |
1024 | size_t size; | |
6bd0dcfa ND |
1025 | int retval; |
1026 | ||
1027 | /* | |
1028 | * We need to count the IRQs and allocate their storage before scanning | |
1029 | * the PDT and creating the function entries, because adding a new | |
1030 | * function can trigger events that result in the IRQ related storage | |
1031 | * being accessed. | |
1032 | */ | |
1033 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Counting IRQs.\n", __func__); | |
1034 | irq_count = 0; | |
5191d88a ND |
1035 | data->bootloader_mode = false; |
1036 | ||
6bd0dcfa ND |
1037 | retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_count_irqs); |
1038 | if (retval < 0) { | |
1039 | dev_err(dev, "IRQ counting failed with code %d.\n", retval); | |
1040 | return retval; | |
1041 | } | |
29fd0ec2 | 1042 | |
5191d88a | 1043 | if (data->bootloader_mode) |
ed77bdf4 | 1044 | dev_warn(dev, "Device in bootloader mode.\n"); |
29fd0ec2 | 1045 | |
6bd0dcfa ND |
1046 | data->irq_count = irq_count; |
1047 | data->num_of_irq_regs = (data->irq_count + 7) / 8; | |
1048 | ||
1049 | size = BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long); | |
29fd0ec2 ND |
1050 | data->irq_memory = devm_kzalloc(dev, size * 4, GFP_KERNEL); |
1051 | if (!data->irq_memory) { | |
6bd0dcfa ND |
1052 | dev_err(dev, "Failed to allocate memory for irq masks.\n"); |
1053 | return retval; | |
1054 | } | |
1055 | ||
29fd0ec2 ND |
1056 | data->irq_status = data->irq_memory + size * 0; |
1057 | data->fn_irq_bits = data->irq_memory + size * 1; | |
1058 | data->current_irq_mask = data->irq_memory + size * 2; | |
1059 | data->new_irq_mask = data->irq_memory + size * 3; | |
6bd0dcfa ND |
1060 | |
1061 | return retval; | |
1062 | } | |
1063 | ||
29fd0ec2 | 1064 | int rmi_init_functions(struct rmi_driver_data *data) |
6bd0dcfa ND |
1065 | { |
1066 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1067 | struct device *dev = &rmi_dev->dev; | |
1068 | int irq_count; | |
1069 | int retval; | |
1070 | ||
1071 | irq_count = 0; | |
1072 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Creating functions.\n", __func__); | |
1073 | retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_create_function); | |
1074 | if (retval < 0) { | |
1075 | dev_err(dev, "Function creation failed with code %d.\n", | |
1076 | retval); | |
1077 | goto err_destroy_functions; | |
1078 | } | |
1079 | ||
1080 | if (!data->f01_container) { | |
1081 | dev_err(dev, "Missing F01 container!\n"); | |
1082 | retval = -EINVAL; | |
1083 | goto err_destroy_functions; | |
1084 | } | |
1085 | ||
1086 | retval = rmi_read_block(rmi_dev, | |
1087 | data->f01_container->fd.control_base_addr + 1, | |
1088 | data->current_irq_mask, data->num_of_irq_regs); | |
1089 | if (retval < 0) { | |
1090 | dev_err(dev, "%s: Failed to read current IRQ mask.\n", | |
1091 | __func__); | |
1092 | goto err_destroy_functions; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | ||
1097 | err_destroy_functions: | |
1098 | rmi_free_function_list(rmi_dev); | |
1099 | return retval; | |
1100 | } | |
1101 | ||
2b6a321d AD |
1102 | static int rmi_driver_probe(struct device *dev) |
1103 | { | |
1104 | struct rmi_driver *rmi_driver; | |
1105 | struct rmi_driver_data *data; | |
1106 | struct rmi_device_platform_data *pdata; | |
1107 | struct rmi_device *rmi_dev; | |
2b6a321d AD |
1108 | int retval; |
1109 | ||
1110 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Starting probe.\n", | |
1111 | __func__); | |
1112 | ||
1113 | if (!rmi_is_physical_device(dev)) { | |
1114 | rmi_dbg(RMI_DEBUG_CORE, dev, "Not a physical device.\n"); | |
1115 | return -ENODEV; | |
1116 | } | |
1117 | ||
1118 | rmi_dev = to_rmi_device(dev); | |
1119 | rmi_driver = to_rmi_driver(dev->driver); | |
1120 | rmi_dev->driver = rmi_driver; | |
1121 | ||
1122 | pdata = rmi_get_platform_data(rmi_dev); | |
1123 | ||
d8a8b3ed AD |
1124 | if (rmi_dev->xport->dev->of_node) { |
1125 | retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata); | |
1126 | if (retval) | |
1127 | return retval; | |
1128 | } | |
1129 | ||
2b6a321d AD |
1130 | data = devm_kzalloc(dev, sizeof(struct rmi_driver_data), GFP_KERNEL); |
1131 | if (!data) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | INIT_LIST_HEAD(&data->function_list); | |
1135 | data->rmi_dev = rmi_dev; | |
1136 | dev_set_drvdata(&rmi_dev->dev, data); | |
1137 | ||
1138 | /* | |
1139 | * Right before a warm boot, the sensor might be in some unusual state, | |
1140 | * such as F54 diagnostics, or F34 bootloader mode after a firmware | |
1141 | * or configuration update. In order to clear the sensor to a known | |
1142 | * state and/or apply any updates, we issue a initial reset to clear any | |
1143 | * previous settings and force it into normal operation. | |
1144 | * | |
1145 | * We have to do this before actually building the PDT because | |
1146 | * the reflash updates (if any) might cause various registers to move | |
1147 | * around. | |
1148 | * | |
1149 | * For a number of reasons, this initial reset may fail to return | |
1150 | * within the specified time, but we'll still be able to bring up the | |
1151 | * driver normally after that failure. This occurs most commonly in | |
1152 | * a cold boot situation (where then firmware takes longer to come up | |
1153 | * than from a warm boot) and the reset_delay_ms in the platform data | |
1154 | * has been set too short to accommodate that. Since the sensor will | |
1155 | * eventually come up and be usable, we don't want to just fail here | |
1156 | * and leave the customer's device unusable. So we warn them, and | |
1157 | * continue processing. | |
1158 | */ | |
1159 | retval = rmi_scan_pdt(rmi_dev, NULL, rmi_initial_reset); | |
1160 | if (retval < 0) | |
1161 | dev_warn(dev, "RMI initial reset failed! Continuing in spite of this.\n"); | |
1162 | ||
1163 | retval = rmi_read(rmi_dev, PDT_PROPERTIES_LOCATION, &data->pdt_props); | |
1164 | if (retval < 0) { | |
1165 | /* | |
1166 | * we'll print out a warning and continue since | |
1167 | * failure to get the PDT properties is not a cause to fail | |
1168 | */ | |
1169 | dev_warn(dev, "Could not read PDT properties from %#06x (code %d). Assuming 0x00.\n", | |
1170 | PDT_PROPERTIES_LOCATION, retval); | |
1171 | } | |
1172 | ||
2b6a321d | 1173 | mutex_init(&data->irq_mutex); |
a64ea311 | 1174 | mutex_init(&data->enabled_mutex); |
2b6a321d | 1175 | |
6bd0dcfa ND |
1176 | retval = rmi_probe_interrupts(data); |
1177 | if (retval) | |
2b6a321d | 1178 | goto err; |
2b6a321d AD |
1179 | |
1180 | if (rmi_dev->xport->input) { | |
1181 | /* | |
1182 | * The transport driver already has an input device. | |
1183 | * In some cases it is preferable to reuse the transport | |
1184 | * devices input device instead of creating a new one here. | |
1185 | * One example is some HID touchpads report "pass-through" | |
1186 | * button events are not reported by rmi registers. | |
1187 | */ | |
1188 | data->input = rmi_dev->xport->input; | |
1189 | } else { | |
1190 | data->input = devm_input_allocate_device(dev); | |
1191 | if (!data->input) { | |
1192 | dev_err(dev, "%s: Failed to allocate input device.\n", | |
1193 | __func__); | |
1194 | retval = -ENOMEM; | |
6bd0dcfa | 1195 | goto err; |
2b6a321d AD |
1196 | } |
1197 | rmi_driver_set_input_params(rmi_dev, data->input); | |
1198 | data->input->phys = devm_kasprintf(dev, GFP_KERNEL, | |
1199 | "%s/input0", dev_name(dev)); | |
1200 | } | |
1201 | ||
6bd0dcfa ND |
1202 | retval = rmi_init_functions(data); |
1203 | if (retval) | |
1204 | goto err; | |
2b6a321d | 1205 | |
29fd0ec2 ND |
1206 | retval = rmi_f34_create_sysfs(rmi_dev); |
1207 | if (retval) | |
1208 | goto err; | |
1209 | ||
2b6a321d AD |
1210 | if (data->input) { |
1211 | rmi_driver_set_input_name(rmi_dev, data->input); | |
1212 | if (!rmi_dev->xport->input) { | |
1213 | if (input_register_device(data->input)) { | |
1214 | dev_err(dev, "%s: Failed to register input device.\n", | |
1215 | __func__); | |
1216 | goto err_destroy_functions; | |
1217 | } | |
1218 | } | |
1219 | } | |
1220 | ||
3aeed5b5 BA |
1221 | retval = rmi_irq_init(rmi_dev); |
1222 | if (retval < 0) | |
1223 | goto err_destroy_functions; | |
1224 | ||
2b6a321d AD |
1225 | if (data->f01_container->dev.driver) |
1226 | /* Driver already bound, so enable ATTN now. */ | |
29fd0ec2 | 1227 | return rmi_enable_sensor(rmi_dev); |
2b6a321d AD |
1228 | |
1229 | return 0; | |
1230 | ||
1231 | err_destroy_functions: | |
1232 | rmi_free_function_list(rmi_dev); | |
1233 | err: | |
1234 | return retval < 0 ? retval : 0; | |
1235 | } | |
1236 | ||
1237 | static struct rmi_driver rmi_physical_driver = { | |
1238 | .driver = { | |
1239 | .owner = THIS_MODULE, | |
1240 | .name = "rmi4_physical", | |
1241 | .bus = &rmi_bus_type, | |
1242 | .probe = rmi_driver_probe, | |
1243 | .remove = rmi_driver_remove, | |
1244 | }, | |
1245 | .reset_handler = rmi_driver_reset_handler, | |
1246 | .clear_irq_bits = rmi_driver_clear_irq_bits, | |
1247 | .set_irq_bits = rmi_driver_set_irq_bits, | |
1248 | .set_input_params = rmi_driver_set_input_params, | |
1249 | }; | |
1250 | ||
1251 | bool rmi_is_physical_driver(struct device_driver *drv) | |
1252 | { | |
1253 | return drv == &rmi_physical_driver.driver; | |
1254 | } | |
1255 | ||
1256 | int __init rmi_register_physical_driver(void) | |
1257 | { | |
1258 | int error; | |
1259 | ||
1260 | error = driver_register(&rmi_physical_driver.driver); | |
1261 | if (error) { | |
1262 | pr_err("%s: driver register failed, code=%d.\n", __func__, | |
1263 | error); | |
1264 | return error; | |
1265 | } | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | void __exit rmi_unregister_physical_driver(void) | |
1271 | { | |
1272 | driver_unregister(&rmi_physical_driver.driver); | |
1273 | } |