Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2b6a321d AD |
2 | /* |
3 | * Copyright (c) 2011-2016 Synaptics Incorporated | |
4 | * Copyright (c) 2011 Unixphere | |
5 | * | |
6 | * This driver provides the core support for a single RMI4-based device. | |
7 | * | |
8 | * The RMI4 specification can be found here (URL split for line length): | |
9 | * | |
10 | * http://www.synaptics.com/sites/default/files/ | |
11 | * 511-000136-01-Rev-E-RMI4-Interfacing-Guide.pdf | |
2b6a321d AD |
12 | */ |
13 | ||
14 | #include <linux/bitmap.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/fs.h> | |
3aeed5b5 | 17 | #include <linux/irq.h> |
2b6a321d AD |
18 | #include <linux/pm.h> |
19 | #include <linux/slab.h> | |
d8a8b3ed | 20 | #include <linux/of.h> |
24d28e4f | 21 | #include <linux/irqdomain.h> |
2b6a321d AD |
22 | #include <uapi/linux/input.h> |
23 | #include <linux/rmi.h> | |
24 | #include "rmi_bus.h" | |
25 | #include "rmi_driver.h" | |
26 | ||
27 | #define HAS_NONSTANDARD_PDT_MASK 0x40 | |
28 | #define RMI4_MAX_PAGE 0xff | |
29 | #define RMI4_PAGE_SIZE 0x100 | |
30 | #define RMI4_PAGE_MASK 0xFF00 | |
31 | ||
32 | #define RMI_DEVICE_RESET_CMD 0x01 | |
33 | #define DEFAULT_RESET_DELAY_MS 100 | |
34 | ||
29fd0ec2 | 35 | void rmi_free_function_list(struct rmi_device *rmi_dev) |
2b6a321d AD |
36 | { |
37 | struct rmi_function *fn, *tmp; | |
38 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
39 | ||
6bd0dcfa ND |
40 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Freeing function list\n"); |
41 | ||
a1ab6902 DT |
42 | /* Doing it in the reverse order so F01 will be removed last */ |
43 | list_for_each_entry_safe_reverse(fn, tmp, | |
44 | &data->function_list, node) { | |
45 | list_del(&fn->node); | |
46 | rmi_unregister_function(fn); | |
47 | } | |
48 | ||
29fd0ec2 ND |
49 | devm_kfree(&rmi_dev->dev, data->irq_memory); |
50 | data->irq_memory = NULL; | |
51 | data->irq_status = NULL; | |
52 | data->fn_irq_bits = NULL; | |
53 | data->current_irq_mask = NULL; | |
54 | data->new_irq_mask = NULL; | |
55 | ||
2b6a321d | 56 | data->f01_container = NULL; |
29fd0ec2 | 57 | data->f34_container = NULL; |
2b6a321d AD |
58 | } |
59 | ||
60 | static int reset_one_function(struct rmi_function *fn) | |
61 | { | |
62 | struct rmi_function_handler *fh; | |
63 | int retval = 0; | |
64 | ||
65 | if (!fn || !fn->dev.driver) | |
66 | return 0; | |
67 | ||
68 | fh = to_rmi_function_handler(fn->dev.driver); | |
69 | if (fh->reset) { | |
70 | retval = fh->reset(fn); | |
71 | if (retval < 0) | |
72 | dev_err(&fn->dev, "Reset failed with code %d.\n", | |
73 | retval); | |
74 | } | |
75 | ||
76 | return retval; | |
77 | } | |
78 | ||
79 | static int configure_one_function(struct rmi_function *fn) | |
80 | { | |
81 | struct rmi_function_handler *fh; | |
82 | int retval = 0; | |
83 | ||
84 | if (!fn || !fn->dev.driver) | |
85 | return 0; | |
86 | ||
87 | fh = to_rmi_function_handler(fn->dev.driver); | |
88 | if (fh->config) { | |
89 | retval = fh->config(fn); | |
90 | if (retval < 0) | |
91 | dev_err(&fn->dev, "Config failed with code %d.\n", | |
92 | retval); | |
93 | } | |
94 | ||
95 | return retval; | |
96 | } | |
97 | ||
98 | static int rmi_driver_process_reset_requests(struct rmi_device *rmi_dev) | |
99 | { | |
100 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
101 | struct rmi_function *entry; | |
102 | int retval; | |
103 | ||
104 | list_for_each_entry(entry, &data->function_list, node) { | |
105 | retval = reset_one_function(entry); | |
106 | if (retval < 0) | |
107 | return retval; | |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int rmi_driver_process_config_requests(struct rmi_device *rmi_dev) | |
114 | { | |
115 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
116 | struct rmi_function *entry; | |
117 | int retval; | |
118 | ||
119 | list_for_each_entry(entry, &data->function_list, node) { | |
120 | retval = configure_one_function(entry); | |
121 | if (retval < 0) | |
122 | return retval; | |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
3aeed5b5 | 128 | static int rmi_process_interrupt_requests(struct rmi_device *rmi_dev) |
2b6a321d AD |
129 | { |
130 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
131 | struct device *dev = &rmi_dev->dev; | |
24d28e4f | 132 | int i; |
2b6a321d AD |
133 | int error; |
134 | ||
135 | if (!data) | |
136 | return 0; | |
137 | ||
ae9979c3 | 138 | if (!data->attn_data.data) { |
2b6a321d AD |
139 | error = rmi_read_block(rmi_dev, |
140 | data->f01_container->fd.data_base_addr + 1, | |
141 | data->irq_status, data->num_of_irq_regs); | |
142 | if (error < 0) { | |
143 | dev_err(dev, "Failed to read irqs, code=%d\n", error); | |
144 | return error; | |
145 | } | |
146 | } | |
147 | ||
148 | mutex_lock(&data->irq_mutex); | |
363c5387 | 149 | bitmap_and(data->irq_status, data->irq_status, data->fn_irq_bits, |
2b6a321d AD |
150 | data->irq_count); |
151 | /* | |
152 | * At this point, irq_status has all bits that are set in the | |
153 | * interrupt status register and are enabled. | |
154 | */ | |
155 | mutex_unlock(&data->irq_mutex); | |
156 | ||
24d28e4f ND |
157 | for_each_set_bit(i, data->irq_status, data->irq_count) |
158 | handle_nested_irq(irq_find_mapping(data->irqdomain, i)); | |
2b6a321d AD |
159 | |
160 | if (data->input) | |
161 | input_sync(data->input); | |
162 | ||
163 | return 0; | |
164 | } | |
3aeed5b5 | 165 | |
b908d3cd BT |
166 | void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status, |
167 | void *data, size_t size) | |
168 | { | |
169 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); | |
170 | struct rmi4_attn_data attn_data; | |
171 | void *fifo_data; | |
172 | ||
173 | if (!drvdata->enabled) | |
174 | return; | |
175 | ||
176 | fifo_data = kmemdup(data, size, GFP_ATOMIC); | |
177 | if (!fifo_data) | |
178 | return; | |
179 | ||
180 | attn_data.irq_status = irq_status; | |
181 | attn_data.size = size; | |
182 | attn_data.data = fifo_data; | |
183 | ||
184 | kfifo_put(&drvdata->attn_fifo, attn_data); | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(rmi_set_attn_data); | |
187 | ||
3aeed5b5 BA |
188 | static irqreturn_t rmi_irq_fn(int irq, void *dev_id) |
189 | { | |
190 | struct rmi_device *rmi_dev = dev_id; | |
b908d3cd BT |
191 | struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev); |
192 | struct rmi4_attn_data attn_data = {0}; | |
193 | int ret, count; | |
194 | ||
195 | count = kfifo_get(&drvdata->attn_fifo, &attn_data); | |
196 | if (count) { | |
197 | *(drvdata->irq_status) = attn_data.irq_status; | |
ae9979c3 | 198 | drvdata->attn_data = attn_data; |
b908d3cd | 199 | } |
3aeed5b5 BA |
200 | |
201 | ret = rmi_process_interrupt_requests(rmi_dev); | |
202 | if (ret) | |
203 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, | |
204 | "Failed to process interrupt request: %d\n", ret); | |
205 | ||
55edde9f | 206 | if (count) { |
b908d3cd | 207 | kfree(attn_data.data); |
d5a5e5b5 | 208 | drvdata->attn_data.data = NULL; |
55edde9f | 209 | } |
b908d3cd BT |
210 | |
211 | if (!kfifo_is_empty(&drvdata->attn_fifo)) | |
212 | return rmi_irq_fn(irq, dev_id); | |
213 | ||
3aeed5b5 BA |
214 | return IRQ_HANDLED; |
215 | } | |
216 | ||
217 | static int rmi_irq_init(struct rmi_device *rmi_dev) | |
218 | { | |
219 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
a64ea311 | 220 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 BA |
221 | int irq_flags = irq_get_trigger_type(pdata->irq); |
222 | int ret; | |
223 | ||
224 | if (!irq_flags) | |
225 | irq_flags = IRQF_TRIGGER_LOW; | |
226 | ||
227 | ret = devm_request_threaded_irq(&rmi_dev->dev, pdata->irq, NULL, | |
228 | rmi_irq_fn, irq_flags | IRQF_ONESHOT, | |
72fe3870 | 229 | dev_driver_string(rmi_dev->xport->dev), |
3aeed5b5 BA |
230 | rmi_dev); |
231 | if (ret < 0) { | |
232 | dev_err(&rmi_dev->dev, "Failed to register interrupt %d\n", | |
233 | pdata->irq); | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
a64ea311 BT |
238 | data->enabled = true; |
239 | ||
3aeed5b5 BA |
240 | return 0; |
241 | } | |
2b6a321d | 242 | |
f32361b7 BT |
243 | struct rmi_function *rmi_find_function(struct rmi_device *rmi_dev, u8 number) |
244 | { | |
245 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
246 | struct rmi_function *entry; | |
247 | ||
248 | list_for_each_entry(entry, &data->function_list, node) { | |
249 | if (entry->fd.function_number == number) | |
250 | return entry; | |
251 | } | |
252 | ||
253 | return NULL; | |
254 | } | |
255 | ||
2b6a321d AD |
256 | static int suspend_one_function(struct rmi_function *fn) |
257 | { | |
258 | struct rmi_function_handler *fh; | |
259 | int retval = 0; | |
260 | ||
261 | if (!fn || !fn->dev.driver) | |
262 | return 0; | |
263 | ||
264 | fh = to_rmi_function_handler(fn->dev.driver); | |
265 | if (fh->suspend) { | |
266 | retval = fh->suspend(fn); | |
267 | if (retval < 0) | |
268 | dev_err(&fn->dev, "Suspend failed with code %d.\n", | |
269 | retval); | |
270 | } | |
271 | ||
272 | return retval; | |
273 | } | |
274 | ||
275 | static int rmi_suspend_functions(struct rmi_device *rmi_dev) | |
276 | { | |
277 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
278 | struct rmi_function *entry; | |
279 | int retval; | |
280 | ||
281 | list_for_each_entry(entry, &data->function_list, node) { | |
282 | retval = suspend_one_function(entry); | |
283 | if (retval < 0) | |
284 | return retval; | |
285 | } | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static int resume_one_function(struct rmi_function *fn) | |
291 | { | |
292 | struct rmi_function_handler *fh; | |
293 | int retval = 0; | |
294 | ||
295 | if (!fn || !fn->dev.driver) | |
296 | return 0; | |
297 | ||
298 | fh = to_rmi_function_handler(fn->dev.driver); | |
299 | if (fh->resume) { | |
300 | retval = fh->resume(fn); | |
301 | if (retval < 0) | |
302 | dev_err(&fn->dev, "Resume failed with code %d.\n", | |
303 | retval); | |
304 | } | |
305 | ||
306 | return retval; | |
307 | } | |
308 | ||
309 | static int rmi_resume_functions(struct rmi_device *rmi_dev) | |
310 | { | |
311 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
312 | struct rmi_function *entry; | |
313 | int retval; | |
314 | ||
315 | list_for_each_entry(entry, &data->function_list, node) { | |
316 | retval = resume_one_function(entry); | |
317 | if (retval < 0) | |
318 | return retval; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
29fd0ec2 | 324 | int rmi_enable_sensor(struct rmi_device *rmi_dev) |
2b6a321d AD |
325 | { |
326 | int retval = 0; | |
327 | ||
328 | retval = rmi_driver_process_config_requests(rmi_dev); | |
329 | if (retval < 0) | |
330 | return retval; | |
331 | ||
332 | return rmi_process_interrupt_requests(rmi_dev); | |
333 | } | |
334 | ||
335 | /** | |
336 | * rmi_driver_set_input_params - set input device id and other data. | |
337 | * | |
338 | * @rmi_dev: Pointer to an RMI device | |
339 | * @input: Pointer to input device | |
340 | * | |
341 | */ | |
342 | static int rmi_driver_set_input_params(struct rmi_device *rmi_dev, | |
343 | struct input_dev *input) | |
344 | { | |
345 | input->name = SYNAPTICS_INPUT_DEVICE_NAME; | |
346 | input->id.vendor = SYNAPTICS_VENDOR_ID; | |
347 | input->id.bustype = BUS_RMI; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static void rmi_driver_set_input_name(struct rmi_device *rmi_dev, | |
352 | struct input_dev *input) | |
353 | { | |
354 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
ce363f0d | 355 | const char *device_name = rmi_f01_get_product_ID(data->f01_container); |
2b6a321d AD |
356 | char *name; |
357 | ||
358 | name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL, | |
359 | "Synaptics %s", device_name); | |
360 | if (!name) | |
361 | return; | |
362 | ||
363 | input->name = name; | |
364 | } | |
365 | ||
366 | static int rmi_driver_set_irq_bits(struct rmi_device *rmi_dev, | |
367 | unsigned long *mask) | |
368 | { | |
369 | int error = 0; | |
370 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
371 | struct device *dev = &rmi_dev->dev; | |
372 | ||
373 | mutex_lock(&data->irq_mutex); | |
374 | bitmap_or(data->new_irq_mask, | |
375 | data->current_irq_mask, mask, data->irq_count); | |
376 | ||
377 | error = rmi_write_block(rmi_dev, | |
378 | data->f01_container->fd.control_base_addr + 1, | |
379 | data->new_irq_mask, data->num_of_irq_regs); | |
380 | if (error < 0) { | |
381 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
382 | __func__); | |
383 | goto error_unlock; | |
384 | } | |
385 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
386 | data->num_of_irq_regs); | |
387 | ||
363c5387 EG |
388 | bitmap_or(data->fn_irq_bits, data->fn_irq_bits, mask, data->irq_count); |
389 | ||
2b6a321d AD |
390 | error_unlock: |
391 | mutex_unlock(&data->irq_mutex); | |
392 | return error; | |
393 | } | |
394 | ||
395 | static int rmi_driver_clear_irq_bits(struct rmi_device *rmi_dev, | |
396 | unsigned long *mask) | |
397 | { | |
398 | int error = 0; | |
399 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
400 | struct device *dev = &rmi_dev->dev; | |
401 | ||
402 | mutex_lock(&data->irq_mutex); | |
363c5387 EG |
403 | bitmap_andnot(data->fn_irq_bits, |
404 | data->fn_irq_bits, mask, data->irq_count); | |
2b6a321d AD |
405 | bitmap_andnot(data->new_irq_mask, |
406 | data->current_irq_mask, mask, data->irq_count); | |
407 | ||
408 | error = rmi_write_block(rmi_dev, | |
409 | data->f01_container->fd.control_base_addr + 1, | |
410 | data->new_irq_mask, data->num_of_irq_regs); | |
411 | if (error < 0) { | |
412 | dev_err(dev, "%s: Failed to change enabled interrupts!", | |
413 | __func__); | |
414 | goto error_unlock; | |
415 | } | |
416 | bitmap_copy(data->current_irq_mask, data->new_irq_mask, | |
417 | data->num_of_irq_regs); | |
418 | ||
419 | error_unlock: | |
420 | mutex_unlock(&data->irq_mutex); | |
421 | return error; | |
422 | } | |
423 | ||
424 | static int rmi_driver_reset_handler(struct rmi_device *rmi_dev) | |
425 | { | |
426 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
427 | int error; | |
428 | ||
429 | /* | |
430 | * Can get called before the driver is fully ready to deal with | |
431 | * this situation. | |
432 | */ | |
433 | if (!data || !data->f01_container) { | |
434 | dev_warn(&rmi_dev->dev, | |
435 | "Not ready to handle reset yet!\n"); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | error = rmi_read_block(rmi_dev, | |
440 | data->f01_container->fd.control_base_addr + 1, | |
441 | data->current_irq_mask, data->num_of_irq_regs); | |
442 | if (error < 0) { | |
443 | dev_err(&rmi_dev->dev, "%s: Failed to read current IRQ mask.\n", | |
444 | __func__); | |
445 | return error; | |
446 | } | |
447 | ||
448 | error = rmi_driver_process_reset_requests(rmi_dev); | |
449 | if (error < 0) | |
450 | return error; | |
451 | ||
452 | error = rmi_driver_process_config_requests(rmi_dev); | |
453 | if (error < 0) | |
454 | return error; | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
e9dade41 BT |
459 | static int rmi_read_pdt_entry(struct rmi_device *rmi_dev, |
460 | struct pdt_entry *entry, u16 pdt_address) | |
2b6a321d AD |
461 | { |
462 | u8 buf[RMI_PDT_ENTRY_SIZE]; | |
463 | int error; | |
464 | ||
465 | error = rmi_read_block(rmi_dev, pdt_address, buf, RMI_PDT_ENTRY_SIZE); | |
466 | if (error) { | |
467 | dev_err(&rmi_dev->dev, "Read PDT entry at %#06x failed, code: %d.\n", | |
468 | pdt_address, error); | |
469 | return error; | |
470 | } | |
471 | ||
472 | entry->page_start = pdt_address & RMI4_PAGE_MASK; | |
473 | entry->query_base_addr = buf[0]; | |
474 | entry->command_base_addr = buf[1]; | |
475 | entry->control_base_addr = buf[2]; | |
476 | entry->data_base_addr = buf[3]; | |
477 | entry->interrupt_source_count = buf[4] & RMI_PDT_INT_SOURCE_COUNT_MASK; | |
478 | entry->function_version = (buf[4] & RMI_PDT_FUNCTION_VERSION_MASK) >> 5; | |
479 | entry->function_number = buf[5]; | |
480 | ||
481 | return 0; | |
482 | } | |
2b6a321d AD |
483 | |
484 | static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt, | |
485 | struct rmi_function_descriptor *fd) | |
486 | { | |
487 | fd->query_base_addr = pdt->query_base_addr + pdt->page_start; | |
488 | fd->command_base_addr = pdt->command_base_addr + pdt->page_start; | |
489 | fd->control_base_addr = pdt->control_base_addr + pdt->page_start; | |
490 | fd->data_base_addr = pdt->data_base_addr + pdt->page_start; | |
491 | fd->function_number = pdt->function_number; | |
492 | fd->interrupt_source_count = pdt->interrupt_source_count; | |
493 | fd->function_version = pdt->function_version; | |
494 | } | |
495 | ||
496 | #define RMI_SCAN_CONTINUE 0 | |
497 | #define RMI_SCAN_DONE 1 | |
498 | ||
499 | static int rmi_scan_pdt_page(struct rmi_device *rmi_dev, | |
500 | int page, | |
ad338e8b | 501 | int *empty_pages, |
2b6a321d AD |
502 | void *ctx, |
503 | int (*callback)(struct rmi_device *rmi_dev, | |
504 | void *ctx, | |
505 | const struct pdt_entry *entry)) | |
506 | { | |
507 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
508 | struct pdt_entry pdt_entry; | |
509 | u16 page_start = RMI4_PAGE_SIZE * page; | |
510 | u16 pdt_start = page_start + PDT_START_SCAN_LOCATION; | |
511 | u16 pdt_end = page_start + PDT_END_SCAN_LOCATION; | |
512 | u16 addr; | |
513 | int error; | |
514 | int retval; | |
515 | ||
516 | for (addr = pdt_start; addr >= pdt_end; addr -= RMI_PDT_ENTRY_SIZE) { | |
517 | error = rmi_read_pdt_entry(rmi_dev, &pdt_entry, addr); | |
518 | if (error) | |
519 | return error; | |
520 | ||
521 | if (RMI4_END_OF_PDT(pdt_entry.function_number)) | |
522 | break; | |
523 | ||
524 | retval = callback(rmi_dev, ctx, &pdt_entry); | |
525 | if (retval != RMI_SCAN_CONTINUE) | |
526 | return retval; | |
527 | } | |
528 | ||
ad338e8b ND |
529 | /* |
530 | * Count number of empty PDT pages. If a gap of two pages | |
531 | * or more is found, stop scanning. | |
532 | */ | |
533 | if (addr == pdt_start) | |
534 | ++*empty_pages; | |
535 | else | |
536 | *empty_pages = 0; | |
537 | ||
5191d88a | 538 | return (data->bootloader_mode || *empty_pages >= 2) ? |
2b6a321d AD |
539 | RMI_SCAN_DONE : RMI_SCAN_CONTINUE; |
540 | } | |
541 | ||
29fd0ec2 ND |
542 | int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx, |
543 | int (*callback)(struct rmi_device *rmi_dev, | |
544 | void *ctx, const struct pdt_entry *entry)) | |
2b6a321d AD |
545 | { |
546 | int page; | |
ad338e8b | 547 | int empty_pages = 0; |
2b6a321d AD |
548 | int retval = RMI_SCAN_DONE; |
549 | ||
550 | for (page = 0; page <= RMI4_MAX_PAGE; page++) { | |
ad338e8b ND |
551 | retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages, |
552 | ctx, callback); | |
2b6a321d AD |
553 | if (retval != RMI_SCAN_CONTINUE) |
554 | break; | |
555 | } | |
556 | ||
557 | return retval < 0 ? retval : 0; | |
558 | } | |
559 | ||
560 | int rmi_read_register_desc(struct rmi_device *d, u16 addr, | |
561 | struct rmi_register_descriptor *rdesc) | |
562 | { | |
563 | int ret; | |
564 | u8 size_presence_reg; | |
565 | u8 buf[35]; | |
566 | int presense_offset = 1; | |
567 | u8 *struct_buf; | |
568 | int reg; | |
569 | int offset = 0; | |
570 | int map_offset = 0; | |
571 | int i; | |
572 | int b; | |
573 | ||
574 | /* | |
575 | * The first register of the register descriptor is the size of | |
576 | * the register descriptor's presense register. | |
577 | */ | |
578 | ret = rmi_read(d, addr, &size_presence_reg); | |
579 | if (ret) | |
580 | return ret; | |
581 | ++addr; | |
582 | ||
583 | if (size_presence_reg < 0 || size_presence_reg > 35) | |
584 | return -EIO; | |
585 | ||
586 | memset(buf, 0, sizeof(buf)); | |
587 | ||
588 | /* | |
589 | * The presence register contains the size of the register structure | |
590 | * and a bitmap which identified which packet registers are present | |
591 | * for this particular register type (ie query, control, or data). | |
592 | */ | |
593 | ret = rmi_read_block(d, addr, buf, size_presence_reg); | |
594 | if (ret) | |
595 | return ret; | |
596 | ++addr; | |
597 | ||
598 | if (buf[0] == 0) { | |
599 | presense_offset = 3; | |
600 | rdesc->struct_size = buf[1] | (buf[2] << 8); | |
601 | } else { | |
602 | rdesc->struct_size = buf[0]; | |
603 | } | |
604 | ||
605 | for (i = presense_offset; i < size_presence_reg; i++) { | |
606 | for (b = 0; b < 8; b++) { | |
607 | if (buf[i] & (0x1 << b)) | |
608 | bitmap_set(rdesc->presense_map, map_offset, 1); | |
609 | ++map_offset; | |
610 | } | |
611 | } | |
612 | ||
613 | rdesc->num_registers = bitmap_weight(rdesc->presense_map, | |
614 | RMI_REG_DESC_PRESENSE_BITS); | |
615 | ||
a86854d0 KC |
616 | rdesc->registers = devm_kcalloc(&d->dev, |
617 | rdesc->num_registers, | |
618 | sizeof(struct rmi_register_desc_item), | |
619 | GFP_KERNEL); | |
2b6a321d AD |
620 | if (!rdesc->registers) |
621 | return -ENOMEM; | |
622 | ||
623 | /* | |
624 | * Allocate a temporary buffer to hold the register structure. | |
625 | * I'm not using devm_kzalloc here since it will not be retained | |
626 | * after exiting this function | |
627 | */ | |
628 | struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL); | |
629 | if (!struct_buf) | |
630 | return -ENOMEM; | |
631 | ||
632 | /* | |
633 | * The register structure contains information about every packet | |
634 | * register of this type. This includes the size of the packet | |
635 | * register and a bitmap of all subpackets contained in the packet | |
636 | * register. | |
637 | */ | |
638 | ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size); | |
639 | if (ret) | |
640 | goto free_struct_buff; | |
641 | ||
642 | reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS); | |
2b6a321d AD |
643 | for (i = 0; i < rdesc->num_registers; i++) { |
644 | struct rmi_register_desc_item *item = &rdesc->registers[i]; | |
645 | int reg_size = struct_buf[offset]; | |
646 | ||
647 | ++offset; | |
648 | if (reg_size == 0) { | |
649 | reg_size = struct_buf[offset] | | |
650 | (struct_buf[offset + 1] << 8); | |
651 | offset += 2; | |
652 | } | |
653 | ||
654 | if (reg_size == 0) { | |
655 | reg_size = struct_buf[offset] | | |
656 | (struct_buf[offset + 1] << 8) | | |
657 | (struct_buf[offset + 2] << 16) | | |
658 | (struct_buf[offset + 3] << 24); | |
659 | offset += 4; | |
660 | } | |
661 | ||
662 | item->reg = reg; | |
663 | item->reg_size = reg_size; | |
664 | ||
3e29d6bb AD |
665 | map_offset = 0; |
666 | ||
2b6a321d AD |
667 | do { |
668 | for (b = 0; b < 7; b++) { | |
669 | if (struct_buf[offset] & (0x1 << b)) | |
670 | bitmap_set(item->subpacket_map, | |
671 | map_offset, 1); | |
672 | ++map_offset; | |
673 | } | |
674 | } while (struct_buf[offset++] & 0x80); | |
675 | ||
676 | item->num_subpackets = bitmap_weight(item->subpacket_map, | |
677 | RMI_REG_DESC_SUBPACKET_BITS); | |
678 | ||
679 | rmi_dbg(RMI_DEBUG_CORE, &d->dev, | |
680 | "%s: reg: %d reg size: %ld subpackets: %d\n", __func__, | |
681 | item->reg, item->reg_size, item->num_subpackets); | |
682 | ||
683 | reg = find_next_bit(rdesc->presense_map, | |
684 | RMI_REG_DESC_PRESENSE_BITS, reg + 1); | |
685 | } | |
686 | ||
687 | free_struct_buff: | |
688 | kfree(struct_buf); | |
689 | return ret; | |
690 | } | |
2b6a321d AD |
691 | |
692 | const struct rmi_register_desc_item *rmi_get_register_desc_item( | |
693 | struct rmi_register_descriptor *rdesc, u16 reg) | |
694 | { | |
695 | const struct rmi_register_desc_item *item; | |
696 | int i; | |
697 | ||
698 | for (i = 0; i < rdesc->num_registers; i++) { | |
699 | item = &rdesc->registers[i]; | |
700 | if (item->reg == reg) | |
701 | return item; | |
702 | } | |
703 | ||
704 | return NULL; | |
705 | } | |
2b6a321d AD |
706 | |
707 | size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc) | |
708 | { | |
709 | const struct rmi_register_desc_item *item; | |
710 | int i; | |
711 | size_t size = 0; | |
712 | ||
713 | for (i = 0; i < rdesc->num_registers; i++) { | |
714 | item = &rdesc->registers[i]; | |
715 | size += item->reg_size; | |
716 | } | |
717 | return size; | |
718 | } | |
2b6a321d AD |
719 | |
720 | /* Compute the register offset relative to the base address */ | |
721 | int rmi_register_desc_calc_reg_offset( | |
722 | struct rmi_register_descriptor *rdesc, u16 reg) | |
723 | { | |
724 | const struct rmi_register_desc_item *item; | |
725 | int offset = 0; | |
726 | int i; | |
727 | ||
728 | for (i = 0; i < rdesc->num_registers; i++) { | |
729 | item = &rdesc->registers[i]; | |
730 | if (item->reg == reg) | |
731 | return offset; | |
732 | ++offset; | |
733 | } | |
734 | return -1; | |
735 | } | |
2b6a321d AD |
736 | |
737 | bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item, | |
738 | u8 subpacket) | |
739 | { | |
740 | return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS, | |
741 | subpacket) == subpacket; | |
742 | } | |
743 | ||
2b6a321d AD |
744 | static int rmi_check_bootloader_mode(struct rmi_device *rmi_dev, |
745 | const struct pdt_entry *pdt) | |
746 | { | |
5191d88a ND |
747 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
748 | int ret; | |
749 | u8 status; | |
2b6a321d | 750 | |
5191d88a ND |
751 | if (pdt->function_number == 0x34 && pdt->function_version > 1) { |
752 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
753 | if (ret) { | |
754 | dev_err(&rmi_dev->dev, | |
755 | "Failed to read F34 status: %d.\n", ret); | |
756 | return ret; | |
757 | } | |
758 | ||
759 | if (status & BIT(7)) | |
760 | data->bootloader_mode = true; | |
761 | } else if (pdt->function_number == 0x01) { | |
762 | ret = rmi_read(rmi_dev, pdt->data_base_addr, &status); | |
763 | if (ret) { | |
764 | dev_err(&rmi_dev->dev, | |
765 | "Failed to read F01 status: %d.\n", ret); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | if (status & BIT(6)) | |
770 | data->bootloader_mode = true; | |
2b6a321d AD |
771 | } |
772 | ||
5191d88a | 773 | return 0; |
2b6a321d AD |
774 | } |
775 | ||
776 | static int rmi_count_irqs(struct rmi_device *rmi_dev, | |
777 | void *ctx, const struct pdt_entry *pdt) | |
778 | { | |
2b6a321d | 779 | int *irq_count = ctx; |
5191d88a | 780 | int ret; |
2b6a321d AD |
781 | |
782 | *irq_count += pdt->interrupt_source_count; | |
5191d88a ND |
783 | |
784 | ret = rmi_check_bootloader_mode(rmi_dev, pdt); | |
785 | if (ret < 0) | |
786 | return ret; | |
2b6a321d AD |
787 | |
788 | return RMI_SCAN_CONTINUE; | |
789 | } | |
790 | ||
29fd0ec2 ND |
791 | int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx, |
792 | const struct pdt_entry *pdt) | |
2b6a321d AD |
793 | { |
794 | int error; | |
795 | ||
796 | if (pdt->function_number == 0x01) { | |
797 | u16 cmd_addr = pdt->page_start + pdt->command_base_addr; | |
798 | u8 cmd_buf = RMI_DEVICE_RESET_CMD; | |
799 | const struct rmi_device_platform_data *pdata = | |
800 | rmi_get_platform_data(rmi_dev); | |
801 | ||
802 | if (rmi_dev->xport->ops->reset) { | |
803 | error = rmi_dev->xport->ops->reset(rmi_dev->xport, | |
804 | cmd_addr); | |
805 | if (error) | |
806 | return error; | |
807 | ||
808 | return RMI_SCAN_DONE; | |
809 | } | |
810 | ||
8029a283 | 811 | rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, "Sending reset\n"); |
2b6a321d AD |
812 | error = rmi_write_block(rmi_dev, cmd_addr, &cmd_buf, 1); |
813 | if (error) { | |
814 | dev_err(&rmi_dev->dev, | |
815 | "Initial reset failed. Code = %d.\n", error); | |
816 | return error; | |
817 | } | |
818 | ||
819 | mdelay(pdata->reset_delay_ms ?: DEFAULT_RESET_DELAY_MS); | |
820 | ||
821 | return RMI_SCAN_DONE; | |
822 | } | |
823 | ||
824 | /* F01 should always be on page 0. If we don't find it there, fail. */ | |
825 | return pdt->page_start == 0 ? RMI_SCAN_CONTINUE : -ENODEV; | |
826 | } | |
827 | ||
828 | static int rmi_create_function(struct rmi_device *rmi_dev, | |
829 | void *ctx, const struct pdt_entry *pdt) | |
830 | { | |
831 | struct device *dev = &rmi_dev->dev; | |
ed77bdf4 | 832 | struct rmi_driver_data *data = dev_get_drvdata(dev); |
2b6a321d AD |
833 | int *current_irq_count = ctx; |
834 | struct rmi_function *fn; | |
835 | int i; | |
836 | int error; | |
837 | ||
838 | rmi_dbg(RMI_DEBUG_CORE, dev, "Initializing F%02X.\n", | |
839 | pdt->function_number); | |
840 | ||
841 | fn = kzalloc(sizeof(struct rmi_function) + | |
842 | BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long), | |
843 | GFP_KERNEL); | |
844 | if (!fn) { | |
845 | dev_err(dev, "Failed to allocate memory for F%02X\n", | |
846 | pdt->function_number); | |
847 | return -ENOMEM; | |
848 | } | |
849 | ||
850 | INIT_LIST_HEAD(&fn->node); | |
851 | rmi_driver_copy_pdt_to_fd(pdt, &fn->fd); | |
852 | ||
853 | fn->rmi_dev = rmi_dev; | |
854 | ||
855 | fn->num_of_irqs = pdt->interrupt_source_count; | |
856 | fn->irq_pos = *current_irq_count; | |
857 | *current_irq_count += fn->num_of_irqs; | |
858 | ||
859 | for (i = 0; i < fn->num_of_irqs; i++) | |
860 | set_bit(fn->irq_pos + i, fn->irq_mask); | |
861 | ||
862 | error = rmi_register_function(fn); | |
863 | if (error) | |
bce1a784 | 864 | return error; |
2b6a321d AD |
865 | |
866 | if (pdt->function_number == 0x01) | |
867 | data->f01_container = fn; | |
29fd0ec2 ND |
868 | else if (pdt->function_number == 0x34) |
869 | data->f34_container = fn; | |
2b6a321d AD |
870 | |
871 | list_add_tail(&fn->node, &data->function_list); | |
872 | ||
873 | return RMI_SCAN_CONTINUE; | |
2b6a321d AD |
874 | } |
875 | ||
a64ea311 | 876 | void rmi_enable_irq(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d | 877 | { |
3aeed5b5 | 878 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); |
a64ea311 | 879 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
3aeed5b5 | 880 | int irq = pdata->irq; |
a64ea311 BT |
881 | int irq_flags; |
882 | int retval; | |
2b6a321d | 883 | |
a64ea311 BT |
884 | mutex_lock(&data->enabled_mutex); |
885 | ||
886 | if (data->enabled) | |
887 | goto out; | |
888 | ||
889 | enable_irq(irq); | |
890 | data->enabled = true; | |
891 | if (clear_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
892 | retval = disable_irq_wake(irq); | |
05e0be7c | 893 | if (retval) |
a64ea311 BT |
894 | dev_warn(&rmi_dev->dev, |
895 | "Failed to disable irq for wake: %d\n", | |
896 | retval); | |
897 | } | |
898 | ||
899 | /* | |
900 | * Call rmi_process_interrupt_requests() after enabling irq, | |
901 | * otherwise we may lose interrupt on edge-triggered systems. | |
902 | */ | |
903 | irq_flags = irq_get_trigger_type(pdata->irq); | |
904 | if (irq_flags & IRQ_TYPE_EDGE_BOTH) | |
905 | rmi_process_interrupt_requests(rmi_dev); | |
906 | ||
907 | out: | |
908 | mutex_unlock(&data->enabled_mutex); | |
909 | } | |
910 | ||
911 | void rmi_disable_irq(struct rmi_device *rmi_dev, bool enable_wake) | |
912 | { | |
913 | struct rmi_device_platform_data *pdata = rmi_get_platform_data(rmi_dev); | |
914 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); | |
b908d3cd | 915 | struct rmi4_attn_data attn_data = {0}; |
a64ea311 | 916 | int irq = pdata->irq; |
b908d3cd | 917 | int retval, count; |
a64ea311 BT |
918 | |
919 | mutex_lock(&data->enabled_mutex); | |
920 | ||
921 | if (!data->enabled) | |
922 | goto out; | |
2b6a321d | 923 | |
a64ea311 | 924 | data->enabled = false; |
3aeed5b5 BA |
925 | disable_irq(irq); |
926 | if (enable_wake && device_may_wakeup(rmi_dev->xport->dev)) { | |
927 | retval = enable_irq_wake(irq); | |
05e0be7c | 928 | if (retval) |
3aeed5b5 BA |
929 | dev_warn(&rmi_dev->dev, |
930 | "Failed to enable irq for wake: %d\n", | |
931 | retval); | |
932 | } | |
a64ea311 | 933 | |
b908d3cd BT |
934 | /* make sure the fifo is clean */ |
935 | while (!kfifo_is_empty(&data->attn_fifo)) { | |
936 | count = kfifo_get(&data->attn_fifo, &attn_data); | |
937 | if (count) | |
938 | kfree(attn_data.data); | |
939 | } | |
940 | ||
a64ea311 BT |
941 | out: |
942 | mutex_unlock(&data->enabled_mutex); | |
943 | } | |
944 | ||
945 | int rmi_driver_suspend(struct rmi_device *rmi_dev, bool enable_wake) | |
946 | { | |
947 | int retval; | |
2b6a321d AD |
948 | |
949 | retval = rmi_suspend_functions(rmi_dev); | |
950 | if (retval) | |
951 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
952 | retval); | |
953 | ||
a64ea311 | 954 | rmi_disable_irq(rmi_dev, enable_wake); |
2b6a321d AD |
955 | return retval; |
956 | } | |
957 | EXPORT_SYMBOL_GPL(rmi_driver_suspend); | |
958 | ||
3aeed5b5 | 959 | int rmi_driver_resume(struct rmi_device *rmi_dev, bool clear_wake) |
2b6a321d AD |
960 | { |
961 | int retval; | |
962 | ||
a64ea311 | 963 | rmi_enable_irq(rmi_dev, clear_wake); |
3aeed5b5 | 964 | |
2b6a321d AD |
965 | retval = rmi_resume_functions(rmi_dev); |
966 | if (retval) | |
967 | dev_warn(&rmi_dev->dev, "Failed to suspend functions: %d\n", | |
968 | retval); | |
969 | ||
970 | return retval; | |
971 | } | |
972 | EXPORT_SYMBOL_GPL(rmi_driver_resume); | |
973 | ||
974 | static int rmi_driver_remove(struct device *dev) | |
975 | { | |
976 | struct rmi_device *rmi_dev = to_rmi_device(dev); | |
24d28e4f | 977 | struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); |
2b6a321d | 978 | |
a64ea311 | 979 | rmi_disable_irq(rmi_dev, false); |
2b6a321d | 980 | |
24d28e4f ND |
981 | irq_domain_remove(data->irqdomain); |
982 | data->irqdomain = NULL; | |
983 | ||
29fd0ec2 | 984 | rmi_f34_remove_sysfs(rmi_dev); |
2b6a321d AD |
985 | rmi_free_function_list(rmi_dev); |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
d8a8b3ed AD |
990 | #ifdef CONFIG_OF |
991 | static int rmi_driver_of_probe(struct device *dev, | |
992 | struct rmi_device_platform_data *pdata) | |
993 | { | |
994 | int retval; | |
995 | ||
996 | retval = rmi_of_property_read_u32(dev, &pdata->reset_delay_ms, | |
997 | "syna,reset-delay-ms", 1); | |
998 | if (retval) | |
999 | return retval; | |
1000 | ||
1001 | return 0; | |
1002 | } | |
1003 | #else | |
1004 | static inline int rmi_driver_of_probe(struct device *dev, | |
1005 | struct rmi_device_platform_data *pdata) | |
1006 | { | |
1007 | return -ENODEV; | |
1008 | } | |
1009 | #endif | |
1010 | ||
29fd0ec2 | 1011 | int rmi_probe_interrupts(struct rmi_driver_data *data) |
6bd0dcfa ND |
1012 | { |
1013 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1014 | struct device *dev = &rmi_dev->dev; | |
24d28e4f ND |
1015 | struct fwnode_handle *fwnode = rmi_dev->xport->dev->fwnode; |
1016 | int irq_count = 0; | |
6bd0dcfa | 1017 | size_t size; |
6bd0dcfa ND |
1018 | int retval; |
1019 | ||
1020 | /* | |
1021 | * We need to count the IRQs and allocate their storage before scanning | |
1022 | * the PDT and creating the function entries, because adding a new | |
1023 | * function can trigger events that result in the IRQ related storage | |
1024 | * being accessed. | |
1025 | */ | |
1026 | rmi_dbg(RMI_DEBUG_CORE, dev, "%s: Counting IRQs.\n", __func__); | |
5191d88a ND |
1027 | data->bootloader_mode = false; |
1028 | ||
6bd0dcfa ND |
1029 | retval = rmi_scan_pdt(rmi_dev, &irq_count, rmi_count_irqs); |
1030 | if (retval < 0) { | |
1031 | dev_err(dev, "IRQ counting failed with code %d.\n", retval); | |
1032 | return retval; | |
1033 | } | |
29fd0ec2 | 1034 | |
5191d88a | 1035 | if (data->bootloader_mode) |
ed77bdf4 | 1036 | dev_warn(dev, "Device in bootloader mode.\n"); |
29fd0ec2 | 1037 | |
24d28e4f ND |
1038 | /* Allocate and register a linear revmap irq_domain */ |
1039 | data->irqdomain = irq_domain_create_linear(fwnode, irq_count, | |
1040 | &irq_domain_simple_ops, | |
1041 | data); | |
1042 | if (!data->irqdomain) { | |
1043 | dev_err(&rmi_dev->dev, "Failed to create IRQ domain\n"); | |
fd629294 | 1044 | return -ENOMEM; |
24d28e4f ND |
1045 | } |
1046 | ||
6bd0dcfa ND |
1047 | data->irq_count = irq_count; |
1048 | data->num_of_irq_regs = (data->irq_count + 7) / 8; | |
1049 | ||
1050 | size = BITS_TO_LONGS(data->irq_count) * sizeof(unsigned long); | |
a86854d0 | 1051 | data->irq_memory = devm_kcalloc(dev, size, 4, GFP_KERNEL); |
29fd0ec2 | 1052 | if (!data->irq_memory) { |
6bd0dcfa | 1053 | dev_err(dev, "Failed to allocate memory for irq masks.\n"); |
e7839533 | 1054 | return -ENOMEM; |
6bd0dcfa ND |
1055 | } |
1056 | ||
29fd0ec2 ND |
1057 | data->irq_status = data->irq_memory + size * 0; |
1058 | data->fn_irq_bits = data->irq_memory + size * 1; | |
1059 | data->current_irq_mask = data->irq_memory + size * 2; | |
1060 | data->new_irq_mask = data->irq_memory + size * 3; | |
6bd0dcfa ND |
1061 | |
1062 | return retval; | |
1063 | } | |
1064 | ||
29fd0ec2 | 1065 | int rmi_init_functions(struct rmi_driver_data *data) |
6bd0dcfa ND |
1066 | { |
1067 | struct rmi_device *rmi_dev = data->rmi_dev; | |
1068 | struct device *dev = &rmi_dev->dev; | |
24d28e4f | 1069 | int irq_count = 0; |
6bd0dcfa ND |
1070 | int retval; |
1071 | ||
6bd0dcfa ND |
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, | |
bc499618 KC |
1199 | "%s/input0", dev_name(dev)); |
1200 | if (!data->input->phys) { | |
1201 | retval = -ENOMEM; | |
1202 | goto err; | |
1203 | } | |
2b6a321d AD |
1204 | } |
1205 | ||
6bd0dcfa ND |
1206 | retval = rmi_init_functions(data); |
1207 | if (retval) | |
1208 | goto err; | |
2b6a321d | 1209 | |
29fd0ec2 ND |
1210 | retval = rmi_f34_create_sysfs(rmi_dev); |
1211 | if (retval) | |
1212 | goto err; | |
2b6a321d AD |
1213 | |
1214 | if (data->input) { | |
1215 | rmi_driver_set_input_name(rmi_dev, data->input); | |
1216 | if (!rmi_dev->xport->input) { | |
5caab2da WY |
1217 | retval = input_register_device(data->input); |
1218 | if (retval) { | |
2b6a321d AD |
1219 | dev_err(dev, "%s: Failed to register input device.\n", |
1220 | __func__); | |
1221 | goto err_destroy_functions; | |
1222 | } | |
1223 | } | |
1224 | } | |
1225 | ||
3aeed5b5 BA |
1226 | retval = rmi_irq_init(rmi_dev); |
1227 | if (retval < 0) | |
1228 | goto err_destroy_functions; | |
1229 | ||
8cf0adf2 | 1230 | if (data->f01_container->dev.driver) { |
2b6a321d | 1231 | /* Driver already bound, so enable ATTN now. */ |
8cf0adf2 DT |
1232 | retval = rmi_enable_sensor(rmi_dev); |
1233 | if (retval) | |
1234 | goto err_disable_irq; | |
1235 | } | |
2b6a321d AD |
1236 | |
1237 | return 0; | |
1238 | ||
8cf0adf2 DT |
1239 | err_disable_irq: |
1240 | rmi_disable_irq(rmi_dev, false); | |
2b6a321d AD |
1241 | err_destroy_functions: |
1242 | rmi_free_function_list(rmi_dev); | |
1243 | err: | |
8cf0adf2 | 1244 | return retval; |
2b6a321d AD |
1245 | } |
1246 | ||
1247 | static struct rmi_driver rmi_physical_driver = { | |
1248 | .driver = { | |
1249 | .owner = THIS_MODULE, | |
1250 | .name = "rmi4_physical", | |
1251 | .bus = &rmi_bus_type, | |
1252 | .probe = rmi_driver_probe, | |
1253 | .remove = rmi_driver_remove, | |
1254 | }, | |
1255 | .reset_handler = rmi_driver_reset_handler, | |
1256 | .clear_irq_bits = rmi_driver_clear_irq_bits, | |
1257 | .set_irq_bits = rmi_driver_set_irq_bits, | |
1258 | .set_input_params = rmi_driver_set_input_params, | |
1259 | }; | |
1260 | ||
1261 | bool rmi_is_physical_driver(struct device_driver *drv) | |
1262 | { | |
1263 | return drv == &rmi_physical_driver.driver; | |
1264 | } | |
1265 | ||
1266 | int __init rmi_register_physical_driver(void) | |
1267 | { | |
1268 | int error; | |
1269 | ||
1270 | error = driver_register(&rmi_physical_driver.driver); | |
1271 | if (error) { | |
1272 | pr_err("%s: driver register failed, code=%d.\n", __func__, | |
1273 | error); | |
1274 | return error; | |
1275 | } | |
1276 | ||
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | void __exit rmi_unregister_physical_driver(void) | |
1281 | { | |
1282 | driver_unregister(&rmi_physical_driver.driver); | |
1283 | } |