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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/pm.h> |
22 | #include <linux/slab.h> | |
d8a8b3ed | 23 | #include <linux/of.h> |
2b6a321d AD |
24 | #include <uapi/linux/input.h> |
25 | #include <linux/rmi.h> | |
26 | #include "rmi_bus.h" | |
27 | #include "rmi_driver.h" | |
28 | ||
29 | #define HAS_NONSTANDARD_PDT_MASK 0x40 | |
30 | #define RMI4_MAX_PAGE 0xff | |
31 | #define RMI4_PAGE_SIZE 0x100 | |
32 | #define RMI4_PAGE_MASK 0xFF00 | |
33 | ||
34 | #define RMI_DEVICE_RESET_CMD 0x01 | |
35 | #define DEFAULT_RESET_DELAY_MS 100 | |
36 | ||
29fd0ec2 | 37 | void rmi_free_function_list(struct rmi_device *rmi_dev) |
2b6a321d AD |
38 | { |
39 | struct rmi_function *fn, *tmp; | |
40 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
41 | ||
6bd0dcfa ND |
42 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n"); |
43 | ||
29fd0ec2 ND |
44 | devm_kfree(&rmi_dev->dev, data->irq_memory); |
45 | data->irq_memory = NULL; | |
46 | data->irq_status = NULL; | |
47 | data->fn_irq_bits = NULL; | |
48 | data->current_irq_mask = NULL; | |
49 | data->new_irq_mask = NULL; | |
50 | ||
2b6a321d | 51 | data->f01_container = NULL; |
29fd0ec2 | 52 | data->f34_container = NULL; |
2b6a321d AD |
53 | |
54 | /* Doing it in the reverse order so F01 will be removed last */ | |
55 | list_for_each_entry_safe_reverse(fn, tmp, | |
56 | &data->function_list, node) { | |
57 | list_del(&fn->node); | |
58 | rmi_unregister_function(fn); | |
59 | } | |
60 | } | |
61 | ||
62 | static int reset_one_function(struct rmi_function *fn) | |
63 | { | |
64 | struct rmi_function_handler *fh; | |
65 | int retval = 0; | |
66 | ||
67 | if (!fn || !fn->dev.driver) | |
68 | return 0; | |
69 | ||
70 | fh = to_rmi_function_handler(fn->dev.driver); | |
71 | if (fh->reset) { | |
72 | retval = fh->reset(fn); | |
73 | if (retval < 0) | |
74 | dev_err(&fn->dev, "Reset failed with code %d.\n", | |
75 | retval); | |
76 | } | |
77 | ||
78 | return retval; | |
79 | } | |
80 | ||
81 | static int configure_one_function(struct rmi_function *fn) | |
82 | { | |
83 | struct rmi_function_handler *fh; | |
84 | int retval = 0; | |
85 | ||
86 | if (!fn || !fn->dev.driver) | |
87 | return 0; | |
88 | ||
89 | fh = to_rmi_function_handler(fn->dev.driver); | |
90 | if (fh->config) { | |
91 | retval = fh->config(fn); | |
92 | if (retval < 0) | |
93 | dev_err(&fn->dev, "Config failed with code %d.\n", | |
94 | retval); | |
95 | } | |
96 | ||
97 | return retval; | |
98 | } | |
99 | ||
100 | static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev) | |
101 | { | |
102 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
103 | struct rmi_function *entry; | |
104 | int retval; | |
105 | ||
106 | list_for_each_entry(entry, &data->function_list, node) { | |
107 | retval = reset_one_function(entry); | |
108 | if (retval < 0) | |
109 | return retval; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev) | |
116 | { | |
117 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
118 | struct rmi_function *entry; | |
119 | int retval; | |
120 | ||
121 | list_for_each_entry(entry, &data->function_list, node) { | |
122 | retval = configure_one_function(entry); | |
123 | if (retval < 0) | |
124 | return retval; | |
125 | } | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static void process_one_interrupt(struct rmi_driver_data *data, | |
131 | struct rmi_function *fn) | |
132 | { | |
133 | struct rmi_function_handler *fh; | |
134 | ||
135 | if (!fn || !fn->dev.driver) | |
136 | return; | |
137 | ||
138 | fh = to_rmi_function_handler(fn->dev.driver); | |
a1376d3d | 139 | if (fh->attention) { |
2b6a321d AD |
140 | bitmap_and(data->fn_irq_bits, data->irq_status, fn->irq_mask, |
141 | data->irq_count); | |
142 | if (!bitmap_empty(data->fn_irq_bits, data->irq_count)) | |
143 | fh->attention(fn, data->fn_irq_bits); | |
144 | } | |
145 | } | |
146 | ||
3aeed5b5 | 147 | static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev) |
2b6a321d AD |
148 | { |
149 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
150 | struct device *dev = &rmi_dev->dev; | |
151 | struct rmi_function *entry; | |
152 | int error; | |
153 | ||
154 | if (!data) | |
155 | return 0; | |
156 | ||
ae9979c3 | 157 | if (!data->attn_data.data) { |
2b6a321d AD |
158 | error = rmi_read_block(rmi_dev, |
159 | data->f01_container->fd.data_base_addr + 1, | |
160 | data->irq_status, data->num_of_irq_regs); | |
161 | if (error < 0) { | |
162 | dev_err(dev, "Failed to read irqs, code=%d\n", error); | |
163 | return error; | |
164 | } | |
165 | } | |
166 | ||
167 | mutex_lock(&data->irq_mutex); | |
168 | bitmap_and(data->irq_status, data->irq_status, data->current_irq_mask, | |
169 | data->irq_count); | |
170 | /* | |
171 | * At this point, irq_status has all bits that are set in the | |
172 | * interrupt status register and are enabled. | |
173 | */ | |
174 | mutex_unlock(&data->irq_mutex); | |
175 | ||
176 | /* | |
177 | * It would be nice to be able to use irq_chip to handle these | |
178 | * nested IRQs. Unfortunately, most of the current customers for | |
179 | * this driver are using older kernels (3.0.x) that don't support | |
180 | * the features required for that. Once they've shifted to more | |
181 | * recent kernels (say, 3.3 and higher), this should be switched to | |
182 | * use irq_chip. | |
183 | */ | |
184 | list_for_each_entry(entry, &data->function_list, node) | |
a1376d3d | 185 | process_one_interrupt(data, entry); |
2b6a321d AD |
186 | |
187 | if (data->input) | |
188 | input_sync(data->input); | |
189 | ||
190 | return 0; | |
191 | } | |
3aeed5b5 | 192 | |
b908d3cd BT |
193 | void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status, |
194 | void *data, size_t size) | |
195 | { | |
196 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); | |
197 | struct rmi4_attn_data attn_data; | |
198 | void *fifo_data; | |
199 | ||
200 | if (!drvdata->enabled) | |
201 | return; | |
202 | ||
203 | fifo_data = kmemdup(data, size, GFP_ATOMIC); | |
204 | if (!fifo_data) | |
205 | return; | |
206 | ||
207 | attn_data.irq_status = irq_status; | |
208 | attn_data.size = size; | |
209 | attn_data.data = fifo_data; | |
210 | ||
211 | kfifo_put(&drvdata->attn_fifo, attn_data); | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(rmi_set_attn_data); | |
214 | ||
3aeed5b5 BA |
215 | static irqreturn_t rmi_irq_fn(int irq, void *dev_id) |
216 | { | |
217 | struct rmi_device *rmi_dev = dev_id; | |
b908d3cd BT |
218 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); |
219 | struct rmi4_attn_data attn_data = {0}; | |
220 | int ret, count; | |
221 | ||
222 | count = kfifo_get(&drvdata->attn_fifo, &attn_data); | |
223 | if (count) { | |
224 | *(drvdata->irq_status) = attn_data.irq_status; | |
ae9979c3 | 225 | drvdata->attn_data = attn_data; |
b908d3cd | 226 | } |
3aeed5b5 BA |
227 | |
228 | ret = rmi_process_interrupt_requests(rmi_dev); | |
229 | if (ret) | |
230 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, | |
231 | "Failed to process interrupt request: %d\n", ret); | |
232 | ||
55edde9f | 233 | if (count) { |
b908d3cd | 234 | kfree(attn_data.data); |
55edde9f ND |
235 | attn_data.data = NULL; |
236 | } | |
b908d3cd BT |
237 | |
238 | if (!kfifo_is_empty(&drvdata->attn_fifo)) | |
239 | return rmi_irq_fn(irq, dev_id); | |
240 | ||
3aeed5b5 BA |
241 | return IRQ_HANDLED; |
242 | } | |
243 | ||
244 | static int rmi_irq_init(struct rmi_device *rmi_dev) | |
245 | { | |
246 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
a64ea311 | 247 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 BA |
248 | int irq_flags = irq_get_trigger_type(pdata->irq); |
249 | int ret; | |
250 | ||
251 | if (!irq_flags) | |
252 | irq_flags = IRQF_TRIGGER_LOW; | |
253 | ||
254 | ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL, | |
255 | rmi_irq_fn, irq_flags | IRQF_ONESHOT, | |
72fe3870 | 256 | dev_driver_string(rmi_dev->xport->dev), |
3aeed5b5 BA |
257 | rmi_dev); |
258 | if (ret < 0) { | |
259 | dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n", | |
260 | pdata->irq); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
a64ea311 BT |
265 | data->enabled = true; |
266 | ||
3aeed5b5 BA |
267 | return 0; |
268 | } | |
2b6a321d | 269 | |
f32361b7 BT |
270 | struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number) |
271 | { | |
272 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
273 | struct rmi_function *entry; | |
274 | ||
275 | list_for_each_entry(entry, &data->function_list, node) { | |
276 | if (entry->fd.function_number == number) | |
277 | return entry; | |
278 | } | |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
2b6a321d AD |
283 | static int suspend_one_function(struct rmi_function *fn) |
284 | { | |
285 | struct rmi_function_handler *fh; | |
286 | int retval = 0; | |
287 | ||
288 | if (!fn || !fn->dev.driver) | |
289 | return 0; | |
290 | ||
291 | fh = to_rmi_function_handler(fn->dev.driver); | |
292 | if (fh->suspend) { | |
293 | retval = fh->suspend(fn); | |
294 | if (retval < 0) | |
295 | dev_err(&fn->dev, "Suspend failed with code %d.\n", | |
296 | retval); | |
297 | } | |
298 | ||
299 | return retval; | |
300 | } | |
301 | ||
302 | static int rmi_suspend_functions(struct rmi_device *rmi_dev) | |
303 | { | |
304 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
305 | struct rmi_function *entry; | |
306 | int retval; | |
307 | ||
308 | list_for_each_entry(entry, &data->function_list, node) { | |
309 | retval = suspend_one_function(entry); | |
310 | if (retval < 0) | |
311 | return retval; | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static int resume_one_function(struct rmi_function *fn) | |
318 | { | |
319 | struct rmi_function_handler *fh; | |
320 | int retval = 0; | |
321 | ||
322 | if (!fn || !fn->dev.driver) | |
323 | return 0; | |
324 | ||
325 | fh = to_rmi_function_handler(fn->dev.driver); | |
326 | if (fh->resume) { | |
327 | retval = fh->resume(fn); | |
328 | if (retval < 0) | |
329 | dev_err(&fn->dev, "Resume failed with code %d.\n", | |
330 | retval); | |
331 | } | |
332 | ||
333 | return retval; | |
334 | } | |
335 | ||
336 | static int rmi_resume_functions(struct rmi_device *rmi_dev) | |
337 | { | |
338 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
339 | struct rmi_function *entry; | |
340 | int retval; | |
341 | ||
342 | list_for_each_entry(entry, &data->function_list, node) { | |
343 | retval = resume_one_function(entry); | |
344 | if (retval < 0) | |
345 | return retval; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
29fd0ec2 | 351 | int rmi_enable_sensor(struct rmi_device *rmi_dev) |
2b6a321d AD |
352 | { |
353 | int retval = 0; | |
354 | ||
355 | retval = rmi_driver_process_config_requests(rmi_dev); | |
356 | if (retval < 0) | |
357 | return retval; | |
358 | ||
359 | return rmi_process_interrupt_requests(rmi_dev); | |
360 | } | |
361 | ||
362 | /** | |
363 | * rmi_driver_set_input_params - set input device id and other data. | |
364 | * | |
365 | * @rmi_dev: Pointer to an RMI device | |
366 | * @input: Pointer to input device | |
367 | * | |
368 | */ | |
369 | static int rmi_driver_set_input_params(struct rmi_device *rmi_dev, | |
370 | struct input_dev *input) | |
371 | { | |
372 | input->name = SYNAPTICS_INPUT_DEVICE_NAME; | |
373 | input->id.vendor = SYNAPTICS_VENDOR_ID; | |
374 | input->id.bustype = BUS_RMI; | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static void rmi_driver_set_input_name(struct rmi_device *rmi_dev, | |
379 | struct input_dev *input) | |
380 | { | |
381 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
ce363f0d | 382 | const char *device_name = rmi_f01_get_product_ID(data->f01_container); |
2b6a321d AD |
383 | char *name; |
384 | ||
385 | name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL, | |
386 | "Synaptics %s", device_name); | |
387 | if (!name) | |
388 | return; | |
389 | ||
390 | input->name = name; | |
391 | } | |
392 | ||
393 | static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev, | |
394 | unsigned long *mask) | |
395 | { | |
396 | int error = 0; | |
397 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
398 | struct device *dev = &rmi_dev->dev; | |
399 | ||
400 | mutex_lock(&data->irq_mutex); | |
401 | bitmap_or(data->new_irq_mask, | |
402 | data->current_irq_mask, mask, data->irq_count); | |
403 | ||
404 | error = rmi_write_block(rmi_dev, | |
405 | data->f01_container->fd.control_base_addr + 1, | |
406 | data->new_irq_mask, data->num_of_irq_regs); | |
407 | if (error < 0) { | |
408 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
409 | __func__); | |
410 | goto error_unlock; | |
411 | } | |
412 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
413 | data->num_of_irq_regs); | |
414 | ||
415 | error_unlock: | |
416 | mutex_unlock(&data->irq_mutex); | |
417 | return error; | |
418 | } | |
419 | ||
420 | static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev, | |
421 | unsigned long *mask) | |
422 | { | |
423 | int error = 0; | |
424 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
425 | struct device *dev = &rmi_dev->dev; | |
426 | ||
427 | mutex_lock(&data->irq_mutex); | |
428 | bitmap_andnot(data->new_irq_mask, | |
429 | data->current_irq_mask, mask, data->irq_count); | |
430 | ||
431 | error = rmi_write_block(rmi_dev, | |
432 | data->f01_container->fd.control_base_addr + 1, | |
433 | data->new_irq_mask, data->num_of_irq_regs); | |
434 | if (error < 0) { | |
435 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
436 | __func__); | |
437 | goto error_unlock; | |
438 | } | |
439 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
440 | data->num_of_irq_regs); | |
441 | ||
442 | error_unlock: | |
443 | mutex_unlock(&data->irq_mutex); | |
444 | return error; | |
445 | } | |
446 | ||
447 | static int rmi_driver_reset_handler(struct rmi_device *rmi_dev) | |
448 | { | |
449 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
450 | int error; | |
451 | ||
452 | /* | |
453 | * Can get called before the driver is fully ready to deal with | |
454 | * this situation. | |
455 | */ | |
456 | if (!data || !data->f01_container) { | |
457 | dev_warn(&rmi_dev->dev, | |
458 | "Not ready to handle reset yet!\n"); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | error = rmi_read_block(rmi_dev, | |
463 | data->f01_container->fd.control_base_addr + 1, | |
464 | data->current_irq_mask, data->num_of_irq_regs); | |
465 | if (error < 0) { | |
466 | dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n", | |
467 | __func__); | |
468 | return error; | |
469 | } | |
470 | ||
471 | error = rmi_driver_process_reset_requests(rmi_dev); | |
472 | if (error < 0) | |
473 | return error; | |
474 | ||
475 | error = rmi_driver_process_config_requests(rmi_dev); | |
476 | if (error < 0) | |
477 | return error; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
e9dade41 BT |
482 | static int rmi_read_pdt_entry(struct rmi_device *rmi_dev, |
483 | struct pdt_entry *entry, u16 pdt_address) | |
2b6a321d AD |
484 | { |
485 | u8 buf[RMI_PDT_ENTRY_SIZE]; | |
486 | int error; | |
487 | ||
488 | error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE); | |
489 | if (error) { | |
490 | dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n", | |
491 | pdt_address, error); | |
492 | return error; | |
493 | } | |
494 | ||
495 | entry->page_start = pdt_address & RMI4_PAGE_MASK; | |
496 | entry->query_base_addr = buf[0]; | |
497 | entry->command_base_addr = buf[1]; | |
498 | entry->control_base_addr = buf[2]; | |
499 | entry->data_base_addr = buf[3]; | |
500 | entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK; | |
501 | entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5; | |
502 | entry->function_number = buf[5]; | |
503 | ||
504 | return 0; | |
505 | } | |
2b6a321d AD |
506 | |
507 | static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt, | |
508 | struct rmi_function_descriptor *fd) | |
509 | { | |
510 | fd->query_base_addr = pdt->query_base_addr + pdt->page_start; | |
511 | fd->command_base_addr = pdt->command_base_addr + pdt->page_start; | |
512 | fd->control_base_addr = pdt->control_base_addr + pdt->page_start; | |
513 | fd->data_base_addr = pdt->data_base_addr + pdt->page_start; | |
514 | fd->function_number = pdt->function_number; | |
515 | fd->interrupt_source_count = pdt->interrupt_source_count; | |
516 | fd->function_version = pdt->function_version; | |
517 | } | |
518 | ||
519 | #define RMI_SCAN_CONTINUE 0 | |
520 | #define RMI_SCAN_DONE 1 | |
521 | ||
522 | static int rmi_scan_pdt_page(struct rmi_device *rmi_dev, | |
523 | int page, | |
ad338e8b | 524 | int *empty_pages, |
2b6a321d AD |
525 | void *ctx, |
526 | int (*callback)(struct rmi_device *rmi_dev, | |
527 | void *ctx, | |
528 | const struct pdt_entry *entry)) | |
529 | { | |
530 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
531 | struct pdt_entry pdt_entry; | |
532 | u16 page_start = RMI4_PAGE_SIZE * page; | |
533 | u16 pdt_start = page_start + PDT_START_SCAN_LOCATION; | |
534 | u16 pdt_end = page_start + PDT_END_SCAN_LOCATION; | |
535 | u16 addr; | |
536 | int error; | |
537 | int retval; | |
538 | ||
539 | for (addr = pdt_start; addr >= pdt_end; addr -= RMI_PDT_ENTRY_SIZE) { | |
540 | error = rmi_read_pdt_entry(rmi_dev, &pdt_entry, addr); | |
541 | if (error) | |
542 | return error; | |
543 | ||
544 | if (RMI4_END_OF_PDT(pdt_entry.function_number)) | |
545 | break; | |
546 | ||
547 | retval = callback(rmi_dev, ctx, &pdt_entry); | |
548 | if (retval != RMI_SCAN_CONTINUE) | |
549 | return retval; | |
550 | } | |
551 | ||
ad338e8b ND |
552 | /* |
553 | * Count number of empty PDT pages. If a gap of two pages | |
554 | * or more is found, stop scanning. | |
555 | */ | |
556 | if (addr == pdt_start) | |
557 | ++*empty_pages; | |
558 | else | |
559 | *empty_pages = 0; | |
560 | ||
5191d88a | 561 | return (data->bootloader_mode || *empty_pages >= 2) ? |
2b6a321d AD |
562 | RMI_SCAN_DONE : RMI_SCAN_CONTINUE; |
563 | } | |
564 | ||
29fd0ec2 ND |
565 | int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx, |
566 | int (*callback)(struct rmi_device *rmi_dev, | |
567 | void *ctx, const struct pdt_entry *entry)) | |
2b6a321d AD |
568 | { |
569 | int page; | |
ad338e8b | 570 | int empty_pages = 0; |
2b6a321d AD |
571 | int retval = RMI_SCAN_DONE; |
572 | ||
573 | for (page = 0; page <= RMI4_MAX_PAGE; page++) { | |
ad338e8b ND |
574 | retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages, |
575 | ctx, callback); | |
2b6a321d AD |
576 | if (retval != RMI_SCAN_CONTINUE) |
577 | break; | |
578 | } | |
579 | ||
580 | return retval < 0 ? retval : 0; | |
581 | } | |
582 | ||
583 | int rmi_read_register_desc(struct rmi_device *d, u16 addr, | |
584 | struct rmi_register_descriptor *rdesc) | |
585 | { | |
586 | int ret; | |
587 | u8 size_presence_reg; | |
588 | u8 buf[35]; | |
589 | int presense_offset = 1; | |
590 | u8 *struct_buf; | |
591 | int reg; | |
592 | int offset = 0; | |
593 | int map_offset = 0; | |
594 | int i; | |
595 | int b; | |
596 | ||
597 | /* | |
598 | * The first register of the register descriptor is the size of | |
599 | * the register descriptor's presense register. | |
600 | */ | |
601 | ret = rmi_read(d, addr, &size_presence_reg); | |
602 | if (ret) | |
603 | return ret; | |
604 | ++addr; | |
605 | ||
606 | if (size_presence_reg < 0 || size_presence_reg > 35) | |
607 | return -EIO; | |
608 | ||
609 | memset(buf, 0, sizeof(buf)); | |
610 | ||
611 | /* | |
612 | * The presence register contains the size of the register structure | |
613 | * and a bitmap which identified which packet registers are present | |
614 | * for this particular register type (ie query, control, or data). | |
615 | */ | |
616 | ret = rmi_read_block(d, addr, buf, size_presence_reg); | |
617 | if (ret) | |
618 | return ret; | |
619 | ++addr; | |
620 | ||
621 | if (buf[0] == 0) { | |
622 | presense_offset = 3; | |
623 | rdesc->struct_size = buf[1] | (buf[2] << 8); | |
624 | } else { | |
625 | rdesc->struct_size = buf[0]; | |
626 | } | |
627 | ||
628 | for (i = presense_offset; i < size_presence_reg; i++) { | |
629 | for (b = 0; b < 8; b++) { | |
630 | if (buf[i] & (0x1 << b)) | |
631 | bitmap_set(rdesc->presense_map, map_offset, 1); | |
632 | ++map_offset; | |
633 | } | |
634 | } | |
635 | ||
636 | rdesc->num_registers = bitmap_weight(rdesc->presense_map, | |
637 | RMI_REG_DESC_PRESENSE_BITS); | |
638 | ||
639 | rdesc->registers = devm_kzalloc(&d->dev, rdesc->num_registers * | |
640 | sizeof(struct rmi_register_desc_item), | |
641 | GFP_KERNEL); | |
642 | if (!rdesc->registers) | |
643 | return -ENOMEM; | |
644 | ||
645 | /* | |
646 | * Allocate a temporary buffer to hold the register structure. | |
647 | * I'm not using devm_kzalloc here since it will not be retained | |
648 | * after exiting this function | |
649 | */ | |
650 | struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL); | |
651 | if (!struct_buf) | |
652 | return -ENOMEM; | |
653 | ||
654 | /* | |
655 | * The register structure contains information about every packet | |
656 | * register of this type. This includes the size of the packet | |
657 | * register and a bitmap of all subpackets contained in the packet | |
658 | * register. | |
659 | */ | |
660 | ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size); | |
661 | if (ret) | |
662 | goto free_struct_buff; | |
663 | ||
664 | reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS); | |
2b6a321d AD |
665 | for (i = 0; i < rdesc->num_registers; i++) { |
666 | struct rmi_register_desc_item *item = &rdesc->registers[i]; | |
667 | int reg_size = struct_buf[offset]; | |
668 | ||
669 | ++offset; | |
670 | if (reg_size == 0) { | |
671 | reg_size = struct_buf[offset] | | |
672 | (struct_buf[offset + 1] << 8); | |
673 | offset += 2; | |
674 | } | |
675 | ||
676 | if (reg_size == 0) { | |
677 | reg_size = struct_buf[offset] | | |
678 | (struct_buf[offset + 1] << 8) | | |
679 | (struct_buf[offset + 2] << 16) | | |
680 | (struct_buf[offset + 3] << 24); | |
681 | offset += 4; | |
682 | } | |
683 | ||
684 | item->reg = reg; | |
685 | item->reg_size = reg_size; | |
686 | ||
3e29d6bb AD |
687 | map_offset = 0; |
688 | ||
2b6a321d AD |
689 | do { |
690 | for (b = 0; b < 7; b++) { | |
691 | if (struct_buf[offset] & (0x1 << b)) | |
692 | bitmap_set(item->subpacket_map, | |
693 | map_offset, 1); | |
694 | ++map_offset; | |
695 | } | |
696 | } while (struct_buf[offset++] & 0x80); | |
697 | ||
698 | item->num_subpackets = bitmap_weight(item->subpacket_map, | |
699 | RMI_REG_DESC_SUBPACKET_BITS); | |
700 | ||
701 | rmi_dbg(RMI_DEBUG_CORE, &d->dev, | |
702 | "%s: reg: %d reg size: %ld subpackets: %d\n", __func__, | |
703 | item->reg, item->reg_size, item->num_subpackets); | |
704 | ||
705 | reg = find_next_bit(rdesc->presense_map, | |
706 | RMI_REG_DESC_PRESENSE_BITS, reg + 1); | |
707 | } | |
708 | ||
709 | free_struct_buff: | |
710 | kfree(struct_buf); | |
711 | return ret; | |
712 | } | |
2b6a321d AD |
713 | |
714 | const struct rmi_register_desc_item *rmi_get_register_desc_item( | |
715 | struct rmi_register_descriptor *rdesc, u16 reg) | |
716 | { | |
717 | const struct rmi_register_desc_item *item; | |
718 | int i; | |
719 | ||
720 | for (i = 0; i < rdesc->num_registers; i++) { | |
721 | item = &rdesc->registers[i]; | |
722 | if (item->reg == reg) | |
723 | return item; | |
724 | } | |
725 | ||
726 | return NULL; | |
727 | } | |
2b6a321d AD |
728 | |
729 | size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc) | |
730 | { | |
731 | const struct rmi_register_desc_item *item; | |
732 | int i; | |
733 | size_t size = 0; | |
734 | ||
735 | for (i = 0; i < rdesc->num_registers; i++) { | |
736 | item = &rdesc->registers[i]; | |
737 | size += item->reg_size; | |
738 | } | |
739 | return size; | |
740 | } | |
2b6a321d AD |
741 | |
742 | /* Compute the register offset relative to the base address */ | |
743 | int rmi_register_desc_calc_reg_offset( | |
744 | struct rmi_register_descriptor *rdesc, u16 reg) | |
745 | { | |
746 | const struct rmi_register_desc_item *item; | |
747 | int offset = 0; | |
748 | int i; | |
749 | ||
750 | for (i = 0; i < rdesc->num_registers; i++) { | |
751 | item = &rdesc->registers[i]; | |
752 | if (item->reg == reg) | |
753 | return offset; | |
754 | ++offset; | |
755 | } | |
756 | return -1; | |
757 | } | |
2b6a321d AD |
758 | |
759 | bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item, | |
760 | u8 subpacket) | |
761 | { | |
762 | return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS, | |
763 | subpacket) == subpacket; | |
764 | } | |
765 | ||
2b6a321d AD |
766 | static int rmi_check_bootloader_mode(struct rmi_device *rmi_dev, |
767 | const struct pdt_entry *pdt) | |
768 | { | |
5191d88a ND |
769 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
770 | int ret; | |
771 | u8 status; | |
2b6a321d | 772 | |
5191d88a ND |
773 | if (pdt->function_number == 0x34 && pdt->function_version > 1) { |
774 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
775 | if (ret) { | |
776 | dev_err(&rmi_dev->dev, | |
777 | "Failed to read F34 status: %d.\n", ret); | |
778 | return ret; | |
779 | } | |
780 | ||
781 | if (status & BIT(7)) | |
782 | data->bootloader_mode = true; | |
783 | } else if (pdt->function_number == 0x01) { | |
784 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
785 | if (ret) { | |
786 | dev_err(&rmi_dev->dev, | |
787 | "Failed to read F01 status: %d.\n", ret); | |
788 | return ret; | |
789 | } | |
790 | ||
791 | if (status & BIT(6)) | |
792 | data->bootloader_mode = true; | |
2b6a321d AD |
793 | } |
794 | ||
5191d88a | 795 | return 0; |
2b6a321d AD |
796 | } |
797 | ||
798 | static int rmi_count_irqs(struct rmi_device *rmi_dev, | |
799 | void *ctx, const struct pdt_entry *pdt) | |
800 | { | |
2b6a321d | 801 | int *irq_count = ctx; |
5191d88a | 802 | int ret; |
2b6a321d AD |
803 | |
804 | *irq_count += pdt->interrupt_source_count; | |
5191d88a ND |
805 | |
806 | ret = rmi_check_bootloader_mode(rmi_dev, pdt); | |
807 | if (ret < 0) | |
808 | return ret; | |
2b6a321d AD |
809 | |
810 | return RMI_SCAN_CONTINUE; | |
811 | } | |
812 | ||
29fd0ec2 ND |
813 | int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx, |
814 | const struct pdt_entry *pdt) | |
2b6a321d AD |
815 | { |
816 | int error; | |
817 | ||
818 | if (pdt->function_number == 0x01) { | |
819 | u16 cmd_addr = pdt->page_start + pdt->command_base_addr; | |
820 | u8 cmd_buf = RMI_DEVICE_RESET_CMD; | |
821 | const struct rmi_device_platform_data *pdata = | |
822 | rmi_get_platform_data(rmi_dev); | |
823 | ||
824 | if (rmi_dev->xport->ops->reset) { | |
825 | error = rmi_dev->xport->ops->reset(rmi_dev->xport, | |
826 | cmd_addr); | |
827 | if (error) | |
828 | return error; | |
829 | ||
830 | return RMI_SCAN_DONE; | |
831 | } | |
832 | ||
8029a283 | 833 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n"); |
2b6a321d AD |
834 | error = rmi_write_block(rmi_dev, cmd_addr, &cmd_buf, 1); |
835 | if (error) { | |
836 | dev_err(&rmi_dev->dev, | |
837 | "Initial reset failed. Code = %d.\n", error); | |
838 | return error; | |
839 | } | |
840 | ||
841 | mdelay(pdata->reset_delay_ms ?: DEFAULT_RESET_DELAY_MS); | |
842 | ||
843 | return RMI_SCAN_DONE; | |
844 | } | |
845 | ||
846 | /* F01 should always be on page 0. If we don't find it there, fail. */ | |
847 | return pdt->page_start == 0 ? RMI_SCAN_CONTINUE : -ENODEV; | |
848 | } | |
849 | ||
850 | static int rmi_create_function(struct rmi_device *rmi_dev, | |
851 | void *ctx, const struct pdt_entry *pdt) | |
852 | { | |
853 | struct device *dev = &rmi_dev->dev; | |
ed77bdf4 | 854 | struct rmi_driver_data *data = dev_get_drvdata(dev); |
2b6a321d AD |
855 | int *current_irq_count = ctx; |
856 | struct rmi_function *fn; | |
857 | int i; | |
858 | int error; | |
859 | ||
860 | rmi_dbg(RMI_DEBUG_CORE, dev, "Initializing F%02X.\n", | |
861 | pdt->function_number); | |
862 | ||
863 | fn = kzalloc(sizeof(struct rmi_function) + | |
864 | BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long), | |
865 | GFP_KERNEL); | |
866 | if (!fn) { | |
867 | dev_err(dev, "Failed to allocate memory for F%02X\n", | |
868 | pdt->function_number); | |
869 | return -ENOMEM; | |
870 | } | |
871 | ||
872 | INIT_LIST_HEAD(&fn->node); | |
873 | rmi_driver_copy_pdt_to_fd(pdt, &fn->fd); | |
874 | ||
875 | fn->rmi_dev = rmi_dev; | |
876 | ||
877 | fn->num_of_irqs = pdt->interrupt_source_count; | |
878 | fn->irq_pos = *current_irq_count; | |
879 | *current_irq_count += fn->num_of_irqs; | |
880 | ||
881 | for (i = 0; i < fn->num_of_irqs; i++) | |
882 | set_bit(fn->irq_pos + i, fn->irq_mask); | |
883 | ||
884 | error = rmi_register_function(fn); | |
885 | if (error) | |
886 | goto err_put_fn; | |
887 | ||
888 | if (pdt->function_number == 0x01) | |
889 | data->f01_container = fn; | |
29fd0ec2 ND |
890 | else if (pdt->function_number == 0x34) |
891 | data->f34_container = fn; | |
2b6a321d AD |
892 | |
893 | list_add_tail(&fn->node, &data->function_list); | |
894 | ||
895 | return RMI_SCAN_CONTINUE; | |
896 | ||
897 | err_put_fn: | |
898 | put_device(&fn->dev); | |
899 | return error; | |
900 | } | |
901 | ||
a64ea311 | 902 | void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d | 903 | { |
3aeed5b5 | 904 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); |
a64ea311 | 905 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 | 906 | int irq = pdata->irq; |
a64ea311 BT |
907 | int irq_flags; |
908 | int retval; | |
2b6a321d | 909 | |
a64ea311 BT |
910 | mutex_lock(&data->enabled_mutex); |
911 | ||
912 | if (data->enabled) | |
913 | goto out; | |
914 | ||
915 | enable_irq(irq); | |
916 | data->enabled = true; | |
917 | if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
918 | retval = disable_irq_wake(irq); | |
05e0be7c | 919 | if (retval) |
a64ea311 BT |
920 | dev_warn(&rmi_dev->dev, |
921 | "Failed to disable irq for wake: %d\n", | |
922 | retval); | |
923 | } | |
924 | ||
925 | /* | |
926 | * Call rmi_process_interrupt_requests() after enabling irq, | |
927 | * otherwise we may lose interrupt on edge-triggered systems. | |
928 | */ | |
929 | irq_flags = irq_get_trigger_type(pdata->irq); | |
930 | if (irq_flags & IRQ_TYPE_EDGE_BOTH) | |
931 | rmi_process_interrupt_requests(rmi_dev); | |
932 | ||
933 | out: | |
934 | mutex_unlock(&data->enabled_mutex); | |
935 | } | |
936 | ||
937 | void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake) | |
938 | { | |
939 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
940 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
b908d3cd | 941 | struct rmi4_attn_data attn_data = {0}; |
a64ea311 | 942 | int irq = pdata->irq; |
b908d3cd | 943 | int retval, count; |
a64ea311 BT |
944 | |
945 | mutex_lock(&data->enabled_mutex); | |
946 | ||
947 | if (!data->enabled) | |
948 | goto out; | |
2b6a321d | 949 | |
a64ea311 | 950 | data->enabled = false; |
3aeed5b5 BA |
951 | disable_irq(irq); |
952 | if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
953 | retval = enable_irq_wake(irq); | |
05e0be7c | 954 | if (retval) |
3aeed5b5 BA |
955 | dev_warn(&rmi_dev->dev, |
956 | "Failed to enable irq for wake: %d\n", | |
957 | retval); | |
958 | } | |
a64ea311 | 959 | |
b908d3cd BT |
960 | /* make sure the fifo is clean */ |
961 | while (!kfifo_is_empty(&data->attn_fifo)) { | |
962 | count = kfifo_get(&data->attn_fifo, &attn_data); | |
963 | if (count) | |
964 | kfree(attn_data.data); | |
965 | } | |
966 | ||
a64ea311 BT |
967 | out: |
968 | mutex_unlock(&data->enabled_mutex); | |
969 | } | |
970 | ||
971 | int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake) | |
972 | { | |
973 | int retval; | |
2b6a321d AD |
974 | |
975 | retval = rmi_suspend_functions(rmi_dev); | |
976 | if (retval) | |
977 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
978 | retval); | |
979 | ||
a64ea311 | 980 | rmi_disable_irq(rmi_dev, enable_wake); |
2b6a321d AD |
981 | return retval; |
982 | } | |
983 | EXPORT_SYMBOL_GPL(rmi_driver_suspend); | |
984 | ||
3aeed5b5 | 985 | int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d AD |
986 | { |
987 | int retval; | |
988 | ||
a64ea311 | 989 | rmi_enable_irq(rmi_dev, clear_wake); |
3aeed5b5 | 990 | |
2b6a321d AD |
991 | retval = rmi_resume_functions(rmi_dev); |
992 | if (retval) | |
993 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
994 | retval); | |
995 | ||
996 | return retval; | |
997 | } | |
998 | EXPORT_SYMBOL_GPL(rmi_driver_resume); | |
999 | ||
1000 | static int rmi_driver_remove(struct device *dev) | |
1001 | { | |
1002 | struct rmi_device *rmi_dev = to_rmi_device(dev); | |
1003 | ||
a64ea311 | 1004 | rmi_disable_irq(rmi_dev, false); |
2b6a321d | 1005 | |
29fd0ec2 | 1006 | rmi_f34_remove_sysfs(rmi_dev); |
2b6a321d AD |
1007 | rmi_free_function_list(rmi_dev); |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
d8a8b3ed AD |
1012 | #ifdef CONFIG_OF |
1013 | static int rmi_driver_of_probe(struct device *dev, | |
1014 | struct rmi_device_platform_data *pdata) | |
1015 | { | |
1016 | int retval; | |
1017 | ||
1018 | retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms, | |
1019 | "syna,reset-delay-ms", 1); | |
1020 | if (retval) | |
1021 | return retval; | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | #else | |
1026 | static inline int rmi_driver_of_probe(struct device *dev, | |
1027 | struct rmi_device_platform_data *pdata) | |
1028 | { | |
1029 | return -ENODEV; | |
1030 | } | |
1031 | #endif | |
1032 | ||
29fd0ec2 | 1033 | int rmi_probe_interrupts(struct rmi_driver_data *data) |
6bd0dcfa ND |
1034 | { |
1035 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1036 | struct device *dev = &rmi_dev->dev; | |
1037 | int irq_count; | |
1038 | size_t size; | |
6bd0dcfa ND |
1039 | int retval; |
1040 | ||
1041 | /* | |
1042 | * We need to count the IRQs and allocate their storage before scanning | |
1043 | * the PDT and creating the function entries, because adding a new | |
1044 | * function can trigger events that result in the IRQ related storage | |
1045 | * being accessed. | |
1046 | */ | |
1047 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Counting IRQs.\n", __func__); | |
1048 | irq_count = 0; | |
5191d88a ND |
1049 | data->bootloader_mode = false; |
1050 | ||
6bd0dcfa ND |
1051 | retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_count_irqs); |
1052 | if (retval < 0) { | |
1053 | dev_err(dev, "IRQ counting failed with code %d.\n", retval); | |
1054 | return retval; | |
1055 | } | |
29fd0ec2 | 1056 | |
5191d88a | 1057 | if (data->bootloader_mode) |
ed77bdf4 | 1058 | dev_warn(dev, "Device in bootloader mode.\n"); |
29fd0ec2 | 1059 | |
6bd0dcfa ND |
1060 | data->irq_count = irq_count; |
1061 | data->num_of_irq_regs = (data->irq_count + 7) / 8; | |
1062 | ||
1063 | size = BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long); | |
29fd0ec2 ND |
1064 | data->irq_memory = devm_kzalloc(dev, size * 4, GFP_KERNEL); |
1065 | if (!data->irq_memory) { | |
6bd0dcfa | 1066 | dev_err(dev, "Failed to allocate memory for irq masks.\n"); |
e7839533 | 1067 | return -ENOMEM; |
6bd0dcfa ND |
1068 | } |
1069 | ||
29fd0ec2 ND |
1070 | data->irq_status = data->irq_memory + size * 0; |
1071 | data->fn_irq_bits = data->irq_memory + size * 1; | |
1072 | data->current_irq_mask = data->irq_memory + size * 2; | |
1073 | data->new_irq_mask = data->irq_memory + size * 3; | |
6bd0dcfa ND |
1074 | |
1075 | return retval; | |
1076 | } | |
1077 | ||
29fd0ec2 | 1078 | int rmi_init_functions(struct rmi_driver_data *data) |
6bd0dcfa ND |
1079 | { |
1080 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1081 | struct device *dev = &rmi_dev->dev; | |
1082 | int irq_count; | |
1083 | int retval; | |
1084 | ||
1085 | irq_count = 0; | |
1086 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Creating functions.\n", __func__); | |
1087 | retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_create_function); | |
1088 | if (retval < 0) { | |
1089 | dev_err(dev, "Function creation failed with code %d.\n", | |
1090 | retval); | |
1091 | goto err_destroy_functions; | |
1092 | } | |
1093 | ||
1094 | if (!data->f01_container) { | |
1095 | dev_err(dev, "Missing F01 container!\n"); | |
1096 | retval = -EINVAL; | |
1097 | goto err_destroy_functions; | |
1098 | } | |
1099 | ||
1100 | retval = rmi_read_block(rmi_dev, | |
1101 | data->f01_container->fd.control_base_addr + 1, | |
1102 | data->current_irq_mask, data->num_of_irq_regs); | |
1103 | if (retval < 0) { | |
1104 | dev_err(dev, "%s: Failed to read current IRQ mask.\n", | |
1105 | __func__); | |
1106 | goto err_destroy_functions; | |
1107 | } | |
1108 | ||
1109 | return 0; | |
1110 | ||
1111 | err_destroy_functions: | |
1112 | rmi_free_function_list(rmi_dev); | |
1113 | return retval; | |
1114 | } | |
1115 | ||
2b6a321d AD |
1116 | static int rmi_driver_probe(struct device *dev) |
1117 | { | |
1118 | struct rmi_driver *rmi_driver; | |
1119 | struct rmi_driver_data *data; | |
1120 | struct rmi_device_platform_data *pdata; | |
1121 | struct rmi_device *rmi_dev; | |
2b6a321d AD |
1122 | int retval; |
1123 | ||
1124 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Starting probe.\n", | |
1125 | __func__); | |
1126 | ||
1127 | if (!rmi_is_physical_device(dev)) { | |
1128 | rmi_dbg(RMI_DEBUG_CORE, dev, "Not a physical device.\n"); | |
1129 | return -ENODEV; | |
1130 | } | |
1131 | ||
1132 | rmi_dev = to_rmi_device(dev); | |
1133 | rmi_driver = to_rmi_driver(dev->driver); | |
1134 | rmi_dev->driver = rmi_driver; | |
1135 | ||
1136 | pdata = rmi_get_platform_data(rmi_dev); | |
1137 | ||
d8a8b3ed AD |
1138 | if (rmi_dev->xport->dev->of_node) { |
1139 | retval = rmi_driver_of_probe(rmi_dev->xport->dev, pdata); | |
1140 | if (retval) | |
1141 | return retval; | |
1142 | } | |
1143 | ||
2b6a321d AD |
1144 | data = devm_kzalloc(dev, sizeof(struct rmi_driver_data), GFP_KERNEL); |
1145 | if (!data) | |
1146 | return -ENOMEM; | |
1147 | ||
1148 | INIT_LIST_HEAD(&data->function_list); | |
1149 | data->rmi_dev = rmi_dev; | |
1150 | dev_set_drvdata(&rmi_dev->dev, data); | |
1151 | ||
1152 | /* | |
1153 | * Right before a warm boot, the sensor might be in some unusual state, | |
1154 | * such as F54 diagnostics, or F34 bootloader mode after a firmware | |
1155 | * or configuration update. In order to clear the sensor to a known | |
1156 | * state and/or apply any updates, we issue a initial reset to clear any | |
1157 | * previous settings and force it into normal operation. | |
1158 | * | |
1159 | * We have to do this before actually building the PDT because | |
1160 | * the reflash updates (if any) might cause various registers to move | |
1161 | * around. | |
1162 | * | |
1163 | * For a number of reasons, this initial reset may fail to return | |
1164 | * within the specified time, but we'll still be able to bring up the | |
1165 | * driver normally after that failure. This occurs most commonly in | |
1166 | * a cold boot situation (where then firmware takes longer to come up | |
1167 | * than from a warm boot) and the reset_delay_ms in the platform data | |
1168 | * has been set too short to accommodate that. Since the sensor will | |
1169 | * eventually come up and be usable, we don't want to just fail here | |
1170 | * and leave the customer's device unusable. So we warn them, and | |
1171 | * continue processing. | |
1172 | */ | |
1173 | retval = rmi_scan_pdt(rmi_dev, NULL, rmi_initial_reset); | |
1174 | if (retval < 0) | |
1175 | dev_warn(dev, "RMI initial reset failed! Continuing in spite of this.\n"); | |
1176 | ||
1177 | retval = rmi_read(rmi_dev, PDT_PROPERTIES_LOCATION, &data->pdt_props); | |
1178 | if (retval < 0) { | |
1179 | /* | |
1180 | * we'll print out a warning and continue since | |
1181 | * failure to get the PDT properties is not a cause to fail | |
1182 | */ | |
1183 | dev_warn(dev, "Could not read PDT properties from %#06x (code %d). Assuming 0x00.\n", | |
1184 | PDT_PROPERTIES_LOCATION, retval); | |
1185 | } | |
1186 | ||
2b6a321d | 1187 | mutex_init(&data->irq_mutex); |
a64ea311 | 1188 | mutex_init(&data->enabled_mutex); |
2b6a321d | 1189 | |
6bd0dcfa ND |
1190 | retval = rmi_probe_interrupts(data); |
1191 | if (retval) | |
2b6a321d | 1192 | goto err; |
2b6a321d AD |
1193 | |
1194 | if (rmi_dev->xport->input) { | |
1195 | /* | |
1196 | * The transport driver already has an input device. | |
1197 | * In some cases it is preferable to reuse the transport | |
1198 | * devices input device instead of creating a new one here. | |
1199 | * One example is some HID touchpads report "pass-through" | |
1200 | * button events are not reported by rmi registers. | |
1201 | */ | |
1202 | data->input = rmi_dev->xport->input; | |
1203 | } else { | |
1204 | data->input = devm_input_allocate_device(dev); | |
1205 | if (!data->input) { | |
1206 | dev_err(dev, "%s: Failed to allocate input device.\n", | |
1207 | __func__); | |
1208 | retval = -ENOMEM; | |
6bd0dcfa | 1209 | goto err; |
2b6a321d AD |
1210 | } |
1211 | rmi_driver_set_input_params(rmi_dev, data->input); | |
1212 | data->input->phys = devm_kasprintf(dev, GFP_KERNEL, | |
1213 | "%s/input0", dev_name(dev)); | |
1214 | } | |
1215 | ||
6bd0dcfa ND |
1216 | retval = rmi_init_functions(data); |
1217 | if (retval) | |
1218 | goto err; | |
2b6a321d | 1219 | |
29fd0ec2 ND |
1220 | retval = rmi_f34_create_sysfs(rmi_dev); |
1221 | if (retval) | |
1222 | goto err; | |
2b6a321d AD |
1223 | |
1224 | if (data->input) { | |
1225 | rmi_driver_set_input_name(rmi_dev, data->input); | |
1226 | if (!rmi_dev->xport->input) { | |
1227 | if (input_register_device(data->input)) { | |
1228 | dev_err(dev, "%s: Failed to register input device.\n", | |
1229 | __func__); | |
1230 | goto err_destroy_functions; | |
1231 | } | |
1232 | } | |
1233 | } | |
1234 | ||
3aeed5b5 BA |
1235 | retval = rmi_irq_init(rmi_dev); |
1236 | if (retval < 0) | |
1237 | goto err_destroy_functions; | |
1238 | ||
8cf0adf2 | 1239 | if (data->f01_container->dev.driver) { |
2b6a321d | 1240 | /* Driver already bound, so enable ATTN now. */ |
8cf0adf2 DT |
1241 | retval = rmi_enable_sensor(rmi_dev); |
1242 | if (retval) | |
1243 | goto err_disable_irq; | |
1244 | } | |
2b6a321d AD |
1245 | |
1246 | return 0; | |
1247 | ||
8cf0adf2 DT |
1248 | err_disable_irq: |
1249 | rmi_disable_irq(rmi_dev, false); | |
2b6a321d AD |
1250 | err_destroy_functions: |
1251 | rmi_free_function_list(rmi_dev); | |
1252 | err: | |
8cf0adf2 | 1253 | return retval; |
2b6a321d AD |
1254 | } |
1255 | ||
1256 | static struct rmi_driver rmi_physical_driver = { | |
1257 | .driver = { | |
1258 | .owner = THIS_MODULE, | |
1259 | .name = "rmi4_physical", | |
1260 | .bus = &rmi_bus_type, | |
1261 | .probe = rmi_driver_probe, | |
1262 | .remove = rmi_driver_remove, | |
1263 | }, | |
1264 | .reset_handler = rmi_driver_reset_handler, | |
1265 | .clear_irq_bits = rmi_driver_clear_irq_bits, | |
1266 | .set_irq_bits = rmi_driver_set_irq_bits, | |
1267 | .set_input_params = rmi_driver_set_input_params, | |
1268 | }; | |
1269 | ||
1270 | bool rmi_is_physical_driver(struct device_driver *drv) | |
1271 | { | |
1272 | return drv == &rmi_physical_driver.driver; | |
1273 | } | |
1274 | ||
1275 | int __init rmi_register_physical_driver(void) | |
1276 | { | |
1277 | int error; | |
1278 | ||
1279 | error = driver_register(&rmi_physical_driver.driver); | |
1280 | if (error) { | |
1281 | pr_err("%s: driver register failed, code=%d.\n", __func__, | |
1282 | error); | |
1283 | return error; | |
1284 | } | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | void __exit rmi_unregister_physical_driver(void) | |
1290 | { | |
1291 | driver_unregister(&rmi_physical_driver.driver); | |
1292 | } |