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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
47struct da903x_chip;
48
49struct 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
57struct 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
71static 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
86static 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
99static 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
113static 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
126int 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}
134EXPORT_SYMBOL_GPL(da903x_register_notifier);
135
136int 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}
144EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
145
146int da903x_write(struct device *dev, int reg, uint8_t val)
147{
148 return __da903x_write(to_i2c_client(dev), reg, val);
149}
150EXPORT_SYMBOL_GPL(da903x_write);
151
152int 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}
156EXPORT_SYMBOL_GPL(da903x_writes);
157
158int da903x_read(struct device *dev, int reg, uint8_t *val)
159{
160 return __da903x_read(to_i2c_client(dev), reg, val);
161}
162EXPORT_SYMBOL_GPL(da903x_read);
163
164int 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}
168EXPORT_SYMBOL_GPL(da903x_reads);
169
170int 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 }
186out:
187 mutex_unlock(&chip->lock);
188 return ret;
189}
190EXPORT_SYMBOL_GPL(da903x_set_bits);
191
192int 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 }
208out:
209 mutex_unlock(&chip->lock);
210 return ret;
211}
212EXPORT_SYMBOL_GPL(da903x_clr_bits);
213
214int 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 }
230out:
231 mutex_unlock(&chip->lock);
232 return ret;
233}
234EXPORT_SYMBOL_GPL(da903x_update);
235
236int 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}
244EXPORT_SYMBOL(da903x_query_status);
245
246static 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
263static 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
276static 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
289static 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
302static 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
307static 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
321 __da903x_write(chip->client, 0x10, 0x07);
322 __da903x_write(chip->client, 0x11, 0xff);
323 __da903x_write(chip->client, 0x12, 0xff);
324
325
326 __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
327 __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
328
329
330 __da903x_write(chip->client, 0x90, 0x01);
331 __da903x_write(chip->client, 0xB0, 0x08);
332
333
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
340static 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
354static 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
368static 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
381static 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
394static 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
414static 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
424static 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
441static const struct i2c_device_id da903x_id_table[] = {
442 { "da9030", 0 },
443 { "da9034", 1 },
444 { },
445};
446MODULE_DEVICE_TABLE(i2c, da903x_id_table);
447
448static int __remove_subdev(struct device *dev, void *unused)
449{
450 platform_device_unregister(to_platform_device(dev));
451 return 0;
452}
453
454static int da903x_remove_subdevs(struct da903x_chip *chip)
455{
456 return device_for_each_child(chip->dev, NULL, __remove_subdev);
457}
458
459static 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
486failed:
487 da903x_remove_subdevs(chip);
488 return ret;
489}
490
491static int da903x_probe(struct i2c_client *client,
492 const struct i2c_device_id *id)
493{
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
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
535static int da903x_remove(struct i2c_client *client)
536{
537 struct da903x_chip *chip = i2c_get_clientdata(client);
538
539 da903x_remove_subdevs(chip);
540 return 0;
541}
542
543static struct i2c_driver da903x_driver = {
544 .driver = {
545 .name = "da903x",
546 },
547 .probe = da903x_probe,
548 .remove = da903x_remove,
549 .id_table = da903x_id_table,
550};
551
552static int __init da903x_init(void)
553{
554 return i2c_add_driver(&da903x_driver);
555}
556subsys_initcall(da903x_init);
557
558static void __exit da903x_exit(void)
559{
560 i2c_del_driver(&da903x_driver);
561}
562module_exit(da903x_exit);
563
564MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
565MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
566MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
567MODULE_LICENSE("GPL v2");
568
