1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Base driver for Dialog Semiconductor DA9030/DA9034
4 *
5 * Copyright (C) 2008 Compulab, Ltd.
6 * Mike Rapoport <mike@compulab.co.il>
7 *
8 * Copyright (C) 2006-2008 Marvell International Ltd.
9 * Eric Miao <eric.miao@marvell.com>
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/platform_device.h>
16 #include <linux/i2c.h>
17 #include <linux/mfd/da903x.h>
18 #include <linux/slab.h>
19
20 #define DA9030_CHIP_ID 0x00
21 #define DA9030_EVENT_A 0x01
22 #define DA9030_EVENT_B 0x02
23 #define DA9030_EVENT_C 0x03
24 #define DA9030_STATUS 0x04
25 #define DA9030_IRQ_MASK_A 0x05
26 #define DA9030_IRQ_MASK_B 0x06
27 #define DA9030_IRQ_MASK_C 0x07
28 #define DA9030_SYS_CTRL_A 0x08
29 #define DA9030_SYS_CTRL_B 0x09
30 #define DA9030_FAULT_LOG 0x0a
31
32 #define DA9034_CHIP_ID 0x00
33 #define DA9034_EVENT_A 0x01
34 #define DA9034_EVENT_B 0x02
35 #define DA9034_EVENT_C 0x03
36 #define DA9034_EVENT_D 0x04
37 #define DA9034_STATUS_A 0x05
38 #define DA9034_STATUS_B 0x06
39 #define DA9034_IRQ_MASK_A 0x07
40 #define DA9034_IRQ_MASK_B 0x08
41 #define DA9034_IRQ_MASK_C 0x09
42 #define DA9034_IRQ_MASK_D 0x0a
43 #define DA9034_SYS_CTRL_A 0x0b
44 #define DA9034_SYS_CTRL_B 0x0c
45 #define DA9034_FAULT_LOG 0x0d
46
47 struct da903x_chip;
48
49 struct da903x_chip_ops {
50 int (*init_chip)(struct da903x_chip *);
51 int (*unmask_events)(struct da903x_chip *, unsigned int events);
52 int (*mask_events)(struct da903x_chip *, unsigned int events);
53 int (*read_events)(struct da903x_chip *, unsigned int *events);
54 int (*read_status)(struct da903x_chip *, unsigned int *status);
55 };
56
57 struct da903x_chip {
58 struct i2c_client *client;
59 struct device *dev;
60 const struct da903x_chip_ops *ops;
61
62 int type;
63 uint32_t events_mask;
64
65 struct mutex lock;
66 struct work_struct irq_work;
67
68 struct blocking_notifier_head notifier_list;
69 };
70
__da903x_read(struct i2c_client * client,int reg,uint8_t * val)71 static inline int __da903x_read(struct i2c_client *client,
72 int reg, uint8_t *val)
73 {
74 int ret;
75
76 ret = i2c_smbus_read_byte_data(client, reg);
77 if (ret < 0) {
78 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
79 return ret;
80 }
81
82 *val = (uint8_t)ret;
83 return 0;
84 }
85
__da903x_reads(struct i2c_client * client,int reg,int len,uint8_t * val)86 static inline int __da903x_reads(struct i2c_client *client, int reg,
87 int len, uint8_t *val)
88 {
89 int ret;
90
91 ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
92 if (ret < 0) {
93 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
94 return ret;
95 }
96 return 0;
97 }
98
__da903x_write(struct i2c_client * client,int reg,uint8_t val)99 static inline int __da903x_write(struct i2c_client *client,
100 int reg, uint8_t val)
101 {
102 int ret;
103
104 ret = i2c_smbus_write_byte_data(client, reg, val);
105 if (ret < 0) {
106 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
107 val, reg);
108 return ret;
109 }
110 return 0;
111 }
112
__da903x_writes(struct i2c_client * client,int reg,int len,uint8_t * val)113 static inline int __da903x_writes(struct i2c_client *client, int reg,
114 int len, uint8_t *val)
115 {
116 int ret;
117
118 ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
119 if (ret < 0) {
120 dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
121 return ret;
122 }
123 return 0;
124 }
125
da903x_register_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)126 int da903x_register_notifier(struct device *dev, struct notifier_block *nb,
127 unsigned int events)
128 {
129 struct da903x_chip *chip = dev_get_drvdata(dev);
130
131 chip->ops->unmask_events(chip, events);
132 return blocking_notifier_chain_register(&chip->notifier_list, nb);
133 }
134 EXPORT_SYMBOL_GPL(da903x_register_notifier);
135
da903x_unregister_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)136 int da903x_unregister_notifier(struct device *dev, struct notifier_block *nb,
137 unsigned int events)
138 {
139 struct da903x_chip *chip = dev_get_drvdata(dev);
140
141 chip->ops->mask_events(chip, events);
142 return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
143 }
144 EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
145
da903x_write(struct device * dev,int reg,uint8_t val)146 int da903x_write(struct device *dev, int reg, uint8_t val)
147 {
148 return __da903x_write(to_i2c_client(dev), reg, val);
149 }
150 EXPORT_SYMBOL_GPL(da903x_write);
151
da903x_writes(struct device * dev,int reg,int len,uint8_t * val)152 int da903x_writes(struct device *dev, int reg, int len, uint8_t *val)
153 {
154 return __da903x_writes(to_i2c_client(dev), reg, len, val);
155 }
156 EXPORT_SYMBOL_GPL(da903x_writes);
157
da903x_read(struct device * dev,int reg,uint8_t * val)158 int da903x_read(struct device *dev, int reg, uint8_t *val)
159 {
160 return __da903x_read(to_i2c_client(dev), reg, val);
161 }
162 EXPORT_SYMBOL_GPL(da903x_read);
163
da903x_reads(struct device * dev,int reg,int len,uint8_t * val)164 int da903x_reads(struct device *dev, int reg, int len, uint8_t *val)
165 {
166 return __da903x_reads(to_i2c_client(dev), reg, len, val);
167 }
168 EXPORT_SYMBOL_GPL(da903x_reads);
169
da903x_set_bits(struct device * dev,int reg,uint8_t bit_mask)170 int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
171 {
172 struct da903x_chip *chip = dev_get_drvdata(dev);
173 uint8_t reg_val;
174 int ret = 0;
175
176 mutex_lock(&chip->lock);
177
178 ret = __da903x_read(chip->client, reg, ®_val);
179 if (ret)
180 goto out;
181
182 if ((reg_val & bit_mask) != bit_mask) {
183 reg_val |= bit_mask;
184 ret = __da903x_write(chip->client, reg, reg_val);
185 }
186 out:
187 mutex_unlock(&chip->lock);
188 return ret;
189 }
190 EXPORT_SYMBOL_GPL(da903x_set_bits);
191
da903x_clr_bits(struct device * dev,int reg,uint8_t bit_mask)192 int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
193 {
194 struct da903x_chip *chip = dev_get_drvdata(dev);
195 uint8_t reg_val;
196 int ret = 0;
197
198 mutex_lock(&chip->lock);
199
200 ret = __da903x_read(chip->client, reg, ®_val);
201 if (ret)
202 goto out;
203
204 if (reg_val & bit_mask) {
205 reg_val &= ~bit_mask;
206 ret = __da903x_write(chip->client, reg, reg_val);
207 }
208 out:
209 mutex_unlock(&chip->lock);
210 return ret;
211 }
212 EXPORT_SYMBOL_GPL(da903x_clr_bits);
213
da903x_update(struct device * dev,int reg,uint8_t val,uint8_t mask)214 int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
215 {
216 struct da903x_chip *chip = dev_get_drvdata(dev);
217 uint8_t reg_val;
218 int ret = 0;
219
220 mutex_lock(&chip->lock);
221
222 ret = __da903x_read(chip->client, reg, ®_val);
223 if (ret)
224 goto out;
225
226 if ((reg_val & mask) != val) {
227 reg_val = (reg_val & ~mask) | val;
228 ret = __da903x_write(chip->client, reg, reg_val);
229 }
230 out:
231 mutex_unlock(&chip->lock);
232 return ret;
233 }
234 EXPORT_SYMBOL_GPL(da903x_update);
235
da903x_query_status(struct device * dev,unsigned int sbits)236 int da903x_query_status(struct device *dev, unsigned int sbits)
237 {
238 struct da903x_chip *chip = dev_get_drvdata(dev);
239 unsigned int status = 0;
240
241 chip->ops->read_status(chip, &status);
242 return ((status & sbits) == sbits);
243 }
244 EXPORT_SYMBOL(da903x_query_status);
245
da9030_init_chip(struct da903x_chip * chip)246 static int da9030_init_chip(struct da903x_chip *chip)
247 {
248 uint8_t chip_id;
249 int err;
250
251 err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
252 if (err)
253 return err;
254
255 err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
256 if (err)
257 return err;
258
259 dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
260 return 0;
261 }
262
da9030_unmask_events(struct da903x_chip * chip,unsigned int events)263 static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
264 {
265 uint8_t v[3];
266
267 chip->events_mask &= ~events;
268
269 v[0] = (chip->events_mask & 0xff);
270 v[1] = (chip->events_mask >> 8) & 0xff;
271 v[2] = (chip->events_mask >> 16) & 0xff;
272
273 return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
274 }
275
da9030_mask_events(struct da903x_chip * chip,unsigned int events)276 static int da9030_mask_events(struct da903x_chip *chip, unsigned int events)
277 {
278 uint8_t v[3];
279
280 chip->events_mask |= events;
281
282 v[0] = (chip->events_mask & 0xff);
283 v[1] = (chip->events_mask >> 8) & 0xff;
284 v[2] = (chip->events_mask >> 16) & 0xff;
285
286 return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
287 }
288
da9030_read_events(struct da903x_chip * chip,unsigned int * events)289 static int da9030_read_events(struct da903x_chip *chip, unsigned int *events)
290 {
291 uint8_t v[3] = {0, 0, 0};
292 int ret;
293
294 ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
295 if (ret < 0)
296 return ret;
297
298 *events = (v[2] << 16) | (v[1] << 8) | v[0];
299 return 0;
300 }
301
da9030_read_status(struct da903x_chip * chip,unsigned int * status)302 static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
303 {
304 return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
305 }
306
da9034_init_chip(struct da903x_chip * chip)307 static int da9034_init_chip(struct da903x_chip *chip)
308 {
309 uint8_t chip_id;
310 int err;
311
312 err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
313 if (err)
314 return err;
315
316 err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
317 if (err)
318 return err;
319
320 /* avoid SRAM power off during sleep*/
321 __da903x_write(chip->client, 0x10, 0x07);
322 __da903x_write(chip->client, 0x11, 0xff);
323 __da903x_write(chip->client, 0x12, 0xff);
324
325 /* Enable the ONKEY power down functionality */
326 __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
327 __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
328
329 /* workaround to make LEDs work */
330 __da903x_write(chip->client, 0x90, 0x01);
331 __da903x_write(chip->client, 0xB0, 0x08);
332
333 /* make ADTV1 and SDTV1 effective */
334 __da903x_write(chip->client, 0x20, 0x00);
335
336 dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
337 return 0;
338 }
339
da9034_unmask_events(struct da903x_chip * chip,unsigned int events)340 static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
341 {
342 uint8_t v[4];
343
344 chip->events_mask &= ~events;
345
346 v[0] = (chip->events_mask & 0xff);
347 v[1] = (chip->events_mask >> 8) & 0xff;
348 v[2] = (chip->events_mask >> 16) & 0xff;
349 v[3] = (chip->events_mask >> 24) & 0xff;
350
351 return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
352 }
353
da9034_mask_events(struct da903x_chip * chip,unsigned int events)354 static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
355 {
356 uint8_t v[4];
357
358 chip->events_mask |= events;
359
360 v[0] = (chip->events_mask & 0xff);
361 v[1] = (chip->events_mask >> 8) & 0xff;
362 v[2] = (chip->events_mask >> 16) & 0xff;
363 v[3] = (chip->events_mask >> 24) & 0xff;
364
365 return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
366 }
367
da9034_read_events(struct da903x_chip * chip,unsigned int * events)368 static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
369 {
370 uint8_t v[4] = {0, 0, 0, 0};
371 int ret;
372
373 ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
374 if (ret < 0)
375 return ret;
376
377 *events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
378 return 0;
379 }
380
da9034_read_status(struct da903x_chip * chip,unsigned int * status)381 static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
382 {
383 uint8_t v[2] = {0, 0};
384 int ret = 0;
385
386 ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
387 if (ret)
388 return ret;
389
390 *status = (v[1] << 8) | v[0];
391 return 0;
392 }
393
da903x_irq_work(struct work_struct * work)394 static void da903x_irq_work(struct work_struct *work)
395 {
396 struct da903x_chip *chip =
397 container_of(work, struct da903x_chip, irq_work);
398 unsigned int events = 0;
399
400 while (1) {
401 if (chip->ops->read_events(chip, &events))
402 break;
403
404 events &= ~chip->events_mask;
405 if (events == 0)
406 break;
407
408 blocking_notifier_call_chain(
409 &chip->notifier_list, events, NULL);
410 }
411 enable_irq(chip->client->irq);
412 }
413
da903x_irq_handler(int irq,void * data)414 static irqreturn_t da903x_irq_handler(int irq, void *data)
415 {
416 struct da903x_chip *chip = data;
417
418 disable_irq_nosync(irq);
419 (void)schedule_work(&chip->irq_work);
420
421 return IRQ_HANDLED;
422 }
423
424 static const struct da903x_chip_ops da903x_ops[] = {
425 [0] = {
426 .init_chip = da9030_init_chip,
427 .unmask_events = da9030_unmask_events,
428 .mask_events = da9030_mask_events,
429 .read_events = da9030_read_events,
430 .read_status = da9030_read_status,
431 },
432 [1] = {
433 .init_chip = da9034_init_chip,
434 .unmask_events = da9034_unmask_events,
435 .mask_events = da9034_mask_events,
436 .read_events = da9034_read_events,
437 .read_status = da9034_read_status,
438 }
439 };
440
441 static const struct i2c_device_id da903x_id_table[] = {
442 { "da9030", 0 },
443 { "da9034", 1 },
444 { },
445 };
446 MODULE_DEVICE_TABLE(i2c, da903x_id_table);
447
__remove_subdev(struct device * dev,void * unused)448 static int __remove_subdev(struct device *dev, void *unused)
449 {
450 platform_device_unregister(to_platform_device(dev));
451 return 0;
452 }
453
da903x_remove_subdevs(struct da903x_chip * chip)454 static int da903x_remove_subdevs(struct da903x_chip *chip)
455 {
456 return device_for_each_child(chip->dev, NULL, __remove_subdev);
457 }
458
da903x_add_subdevs(struct da903x_chip * chip,struct da903x_platform_data * pdata)459 static int da903x_add_subdevs(struct da903x_chip *chip,
460 struct da903x_platform_data *pdata)
461 {
462 struct da903x_subdev_info *subdev;
463 struct platform_device *pdev;
464 int i, ret = 0;
465
466 for (i = 0; i < pdata->num_subdevs; i++) {
467 subdev = &pdata->subdevs[i];
468
469 pdev = platform_device_alloc(subdev->name, subdev->id);
470 if (!pdev) {
471 ret = -ENOMEM;
472 goto failed;
473 }
474
475 pdev->dev.parent = chip->dev;
476 pdev->dev.platform_data = subdev->platform_data;
477
478 ret = platform_device_add(pdev);
479 if (ret) {
480 platform_device_put(pdev);
481 goto failed;
482 }
483 }
484 return 0;
485
486 failed:
487 da903x_remove_subdevs(chip);
488 return ret;
489 }
490
da903x_probe(struct i2c_client * client)491 static int da903x_probe(struct i2c_client *client)
492 {
493 const struct i2c_device_id *id = i2c_client_get_device_id(client);
494 struct da903x_platform_data *pdata = dev_get_platdata(&client->dev);
495 struct da903x_chip *chip;
496 unsigned int tmp;
497 int ret;
498
499 chip = devm_kzalloc(&client->dev, sizeof(struct da903x_chip),
500 GFP_KERNEL);
501 if (chip == NULL)
502 return -ENOMEM;
503
504 chip->client = client;
505 chip->dev = &client->dev;
506 chip->ops = &da903x_ops[id->driver_data];
507
508 mutex_init(&chip->lock);
509 INIT_WORK(&chip->irq_work, da903x_irq_work);
510 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
511
512 i2c_set_clientdata(client, chip);
513
514 ret = chip->ops->init_chip(chip);
515 if (ret)
516 return ret;
517
518 /* mask and clear all IRQs */
519 chip->events_mask = 0xffffffff;
520 chip->ops->mask_events(chip, chip->events_mask);
521 chip->ops->read_events(chip, &tmp);
522
523 ret = devm_request_irq(&client->dev, client->irq, da903x_irq_handler,
524 IRQF_TRIGGER_FALLING,
525 "da903x", chip);
526 if (ret) {
527 dev_err(&client->dev, "failed to request irq %d\n",
528 client->irq);
529 return ret;
530 }
531
532 return da903x_add_subdevs(chip, pdata);
533 }
534
da903x_remove(struct i2c_client * client)535 static void da903x_remove(struct i2c_client *client)
536 {
537 struct da903x_chip *chip = i2c_get_clientdata(client);
538
539 da903x_remove_subdevs(chip);
540 }
541
542 static struct i2c_driver da903x_driver = {
543 .driver = {
544 .name = "da903x",
545 },
546 .probe = da903x_probe,
547 .remove = da903x_remove,
548 .id_table = da903x_id_table,
549 };
550
da903x_init(void)551 static int __init da903x_init(void)
552 {
553 return i2c_add_driver(&da903x_driver);
554 }
555 subsys_initcall(da903x_init);
556
da903x_exit(void)557 static void __exit da903x_exit(void)
558 {
559 i2c_del_driver(&da903x_driver);
560 }
561 module_exit(da903x_exit);
562
563 MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
564 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
565 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
566