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15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/platform_device.h>
19#include <linux/i2c.h>
20#include <linux/mfd/da903x.h>
21#include <linux/slab.h>
22
23#define DA9030_CHIP_ID 0x00
24#define DA9030_EVENT_A 0x01
25#define DA9030_EVENT_B 0x02
26#define DA9030_EVENT_C 0x03
27#define DA9030_STATUS 0x04
28#define DA9030_IRQ_MASK_A 0x05
29#define DA9030_IRQ_MASK_B 0x06
30#define DA9030_IRQ_MASK_C 0x07
31#define DA9030_SYS_CTRL_A 0x08
32#define DA9030_SYS_CTRL_B 0x09
33#define DA9030_FAULT_LOG 0x0a
34
35#define DA9034_CHIP_ID 0x00
36#define DA9034_EVENT_A 0x01
37#define DA9034_EVENT_B 0x02
38#define DA9034_EVENT_C 0x03
39#define DA9034_EVENT_D 0x04
40#define DA9034_STATUS_A 0x05
41#define DA9034_STATUS_B 0x06
42#define DA9034_IRQ_MASK_A 0x07
43#define DA9034_IRQ_MASK_B 0x08
44#define DA9034_IRQ_MASK_C 0x09
45#define DA9034_IRQ_MASK_D 0x0a
46#define DA9034_SYS_CTRL_A 0x0b
47#define DA9034_SYS_CTRL_B 0x0c
48#define DA9034_FAULT_LOG 0x0d
49
50struct da903x_chip;
51
52struct da903x_chip_ops {
53 int (*init_chip)(struct da903x_chip *);
54 int (*unmask_events)(struct da903x_chip *, unsigned int events);
55 int (*mask_events)(struct da903x_chip *, unsigned int events);
56 int (*read_events)(struct da903x_chip *, unsigned int *events);
57 int (*read_status)(struct da903x_chip *, unsigned int *status);
58};
59
60struct da903x_chip {
61 struct i2c_client *client;
62 struct device *dev;
63 const struct da903x_chip_ops *ops;
64
65 int type;
66 uint32_t events_mask;
67
68 struct mutex lock;
69 struct work_struct irq_work;
70
71 struct blocking_notifier_head notifier_list;
72};
73
74static inline int __da903x_read(struct i2c_client *client,
75 int reg, uint8_t *val)
76{
77 int ret;
78
79 ret = i2c_smbus_read_byte_data(client, reg);
80 if (ret < 0) {
81 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
82 return ret;
83 }
84
85 *val = (uint8_t)ret;
86 return 0;
87}
88
89static inline int __da903x_reads(struct i2c_client *client, int reg,
90 int len, uint8_t *val)
91{
92 int ret;
93
94 ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
95 if (ret < 0) {
96 dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
97 return ret;
98 }
99 return 0;
100}
101
102static inline int __da903x_write(struct i2c_client *client,
103 int reg, uint8_t val)
104{
105 int ret;
106
107 ret = i2c_smbus_write_byte_data(client, reg, val);
108 if (ret < 0) {
109 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
110 val, reg);
111 return ret;
112 }
113 return 0;
114}
115
116static inline int __da903x_writes(struct i2c_client *client, int reg,
117 int len, uint8_t *val)
118{
119 int ret;
120
121 ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
122 if (ret < 0) {
123 dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
124 return ret;
125 }
126 return 0;
127}
128
129int da903x_register_notifier(struct device *dev, struct notifier_block *nb,
130 unsigned int events)
131{
132 struct da903x_chip *chip = dev_get_drvdata(dev);
133
134 chip->ops->unmask_events(chip, events);
135 return blocking_notifier_chain_register(&chip->notifier_list, nb);
136}
137EXPORT_SYMBOL_GPL(da903x_register_notifier);
138
139int da903x_unregister_notifier(struct device *dev, struct notifier_block *nb,
140 unsigned int events)
141{
142 struct da903x_chip *chip = dev_get_drvdata(dev);
143
144 chip->ops->mask_events(chip, events);
145 return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
146}
147EXPORT_SYMBOL_GPL(da903x_unregister_notifier);
148
149int da903x_write(struct device *dev, int reg, uint8_t val)
150{
151 return __da903x_write(to_i2c_client(dev), reg, val);
152}
153EXPORT_SYMBOL_GPL(da903x_write);
154
155int da903x_writes(struct device *dev, int reg, int len, uint8_t *val)
156{
157 return __da903x_writes(to_i2c_client(dev), reg, len, val);
158}
159EXPORT_SYMBOL_GPL(da903x_writes);
160
161int da903x_read(struct device *dev, int reg, uint8_t *val)
162{
163 return __da903x_read(to_i2c_client(dev), reg, val);
164}
165EXPORT_SYMBOL_GPL(da903x_read);
166
167int da903x_reads(struct device *dev, int reg, int len, uint8_t *val)
168{
169 return __da903x_reads(to_i2c_client(dev), reg, len, val);
170}
171EXPORT_SYMBOL_GPL(da903x_reads);
172
173int da903x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
174{
175 struct da903x_chip *chip = dev_get_drvdata(dev);
176 uint8_t reg_val;
177 int ret = 0;
178
179 mutex_lock(&chip->lock);
180
181 ret = __da903x_read(chip->client, reg, ®_val);
182 if (ret)
183 goto out;
184
185 if ((reg_val & bit_mask) != bit_mask) {
186 reg_val |= bit_mask;
187 ret = __da903x_write(chip->client, reg, reg_val);
188 }
189out:
190 mutex_unlock(&chip->lock);
191 return ret;
192}
193EXPORT_SYMBOL_GPL(da903x_set_bits);
194
195int da903x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
196{
197 struct da903x_chip *chip = dev_get_drvdata(dev);
198 uint8_t reg_val;
199 int ret = 0;
200
201 mutex_lock(&chip->lock);
202
203 ret = __da903x_read(chip->client, reg, ®_val);
204 if (ret)
205 goto out;
206
207 if (reg_val & bit_mask) {
208 reg_val &= ~bit_mask;
209 ret = __da903x_write(chip->client, reg, reg_val);
210 }
211out:
212 mutex_unlock(&chip->lock);
213 return ret;
214}
215EXPORT_SYMBOL_GPL(da903x_clr_bits);
216
217int da903x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
218{
219 struct da903x_chip *chip = dev_get_drvdata(dev);
220 uint8_t reg_val;
221 int ret = 0;
222
223 mutex_lock(&chip->lock);
224
225 ret = __da903x_read(chip->client, reg, ®_val);
226 if (ret)
227 goto out;
228
229 if ((reg_val & mask) != val) {
230 reg_val = (reg_val & ~mask) | val;
231 ret = __da903x_write(chip->client, reg, reg_val);
232 }
233out:
234 mutex_unlock(&chip->lock);
235 return ret;
236}
237EXPORT_SYMBOL_GPL(da903x_update);
238
239int da903x_query_status(struct device *dev, unsigned int sbits)
240{
241 struct da903x_chip *chip = dev_get_drvdata(dev);
242 unsigned int status = 0;
243
244 chip->ops->read_status(chip, &status);
245 return ((status & sbits) == sbits);
246}
247EXPORT_SYMBOL(da903x_query_status);
248
249static int da9030_init_chip(struct da903x_chip *chip)
250{
251 uint8_t chip_id;
252 int err;
253
254 err = __da903x_read(chip->client, DA9030_CHIP_ID, &chip_id);
255 if (err)
256 return err;
257
258 err = __da903x_write(chip->client, DA9030_SYS_CTRL_A, 0xE8);
259 if (err)
260 return err;
261
262 dev_info(chip->dev, "DA9030 (CHIP ID: 0x%02x) detected\n", chip_id);
263 return 0;
264}
265
266static int da9030_unmask_events(struct da903x_chip *chip, unsigned int events)
267{
268 uint8_t v[3];
269
270 chip->events_mask &= ~events;
271
272 v[0] = (chip->events_mask & 0xff);
273 v[1] = (chip->events_mask >> 8) & 0xff;
274 v[2] = (chip->events_mask >> 16) & 0xff;
275
276 return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
277}
278
279static int da9030_mask_events(struct da903x_chip *chip, unsigned int events)
280{
281 uint8_t v[3];
282
283 chip->events_mask |= events;
284
285 v[0] = (chip->events_mask & 0xff);
286 v[1] = (chip->events_mask >> 8) & 0xff;
287 v[2] = (chip->events_mask >> 16) & 0xff;
288
289 return __da903x_writes(chip->client, DA9030_IRQ_MASK_A, 3, v);
290}
291
292static int da9030_read_events(struct da903x_chip *chip, unsigned int *events)
293{
294 uint8_t v[3] = {0, 0, 0};
295 int ret;
296
297 ret = __da903x_reads(chip->client, DA9030_EVENT_A, 3, v);
298 if (ret < 0)
299 return ret;
300
301 *events = (v[2] << 16) | (v[1] << 8) | v[0];
302 return 0;
303}
304
305static int da9030_read_status(struct da903x_chip *chip, unsigned int *status)
306{
307 return __da903x_read(chip->client, DA9030_STATUS, (uint8_t *)status);
308}
309
310static int da9034_init_chip(struct da903x_chip *chip)
311{
312 uint8_t chip_id;
313 int err;
314
315 err = __da903x_read(chip->client, DA9034_CHIP_ID, &chip_id);
316 if (err)
317 return err;
318
319 err = __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0xE8);
320 if (err)
321 return err;
322
323
324 __da903x_write(chip->client, 0x10, 0x07);
325 __da903x_write(chip->client, 0x11, 0xff);
326 __da903x_write(chip->client, 0x12, 0xff);
327
328
329 __da903x_write(chip->client, DA9034_SYS_CTRL_B, 0x20);
330 __da903x_write(chip->client, DA9034_SYS_CTRL_A, 0x60);
331
332
333 __da903x_write(chip->client, 0x90, 0x01);
334 __da903x_write(chip->client, 0xB0, 0x08);
335
336
337 __da903x_write(chip->client, 0x20, 0x00);
338
339 dev_info(chip->dev, "DA9034 (CHIP ID: 0x%02x) detected\n", chip_id);
340 return 0;
341}
342
343static int da9034_unmask_events(struct da903x_chip *chip, unsigned int events)
344{
345 uint8_t v[4];
346
347 chip->events_mask &= ~events;
348
349 v[0] = (chip->events_mask & 0xff);
350 v[1] = (chip->events_mask >> 8) & 0xff;
351 v[2] = (chip->events_mask >> 16) & 0xff;
352 v[3] = (chip->events_mask >> 24) & 0xff;
353
354 return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
355}
356
357static int da9034_mask_events(struct da903x_chip *chip, unsigned int events)
358{
359 uint8_t v[4];
360
361 chip->events_mask |= events;
362
363 v[0] = (chip->events_mask & 0xff);
364 v[1] = (chip->events_mask >> 8) & 0xff;
365 v[2] = (chip->events_mask >> 16) & 0xff;
366 v[3] = (chip->events_mask >> 24) & 0xff;
367
368 return __da903x_writes(chip->client, DA9034_IRQ_MASK_A, 4, v);
369}
370
371static int da9034_read_events(struct da903x_chip *chip, unsigned int *events)
372{
373 uint8_t v[4] = {0, 0, 0, 0};
374 int ret;
375
376 ret = __da903x_reads(chip->client, DA9034_EVENT_A, 4, v);
377 if (ret < 0)
378 return ret;
379
380 *events = (v[3] << 24) | (v[2] << 16) | (v[1] << 8) | v[0];
381 return 0;
382}
383
384static int da9034_read_status(struct da903x_chip *chip, unsigned int *status)
385{
386 uint8_t v[2] = {0, 0};
387 int ret = 0;
388
389 ret = __da903x_reads(chip->client, DA9034_STATUS_A, 2, v);
390 if (ret)
391 return ret;
392
393 *status = (v[1] << 8) | v[0];
394 return 0;
395}
396
397static void da903x_irq_work(struct work_struct *work)
398{
399 struct da903x_chip *chip =
400 container_of(work, struct da903x_chip, irq_work);
401 unsigned int events = 0;
402
403 while (1) {
404 if (chip->ops->read_events(chip, &events))
405 break;
406
407 events &= ~chip->events_mask;
408 if (events == 0)
409 break;
410
411 blocking_notifier_call_chain(
412 &chip->notifier_list, events, NULL);
413 }
414 enable_irq(chip->client->irq);
415}
416
417static irqreturn_t da903x_irq_handler(int irq, void *data)
418{
419 struct da903x_chip *chip = data;
420
421 disable_irq_nosync(irq);
422 (void)schedule_work(&chip->irq_work);
423
424 return IRQ_HANDLED;
425}
426
427static const struct da903x_chip_ops da903x_ops[] = {
428 [0] = {
429 .init_chip = da9030_init_chip,
430 .unmask_events = da9030_unmask_events,
431 .mask_events = da9030_mask_events,
432 .read_events = da9030_read_events,
433 .read_status = da9030_read_status,
434 },
435 [1] = {
436 .init_chip = da9034_init_chip,
437 .unmask_events = da9034_unmask_events,
438 .mask_events = da9034_mask_events,
439 .read_events = da9034_read_events,
440 .read_status = da9034_read_status,
441 }
442};
443
444static const struct i2c_device_id da903x_id_table[] = {
445 { "da9030", 0 },
446 { "da9034", 1 },
447 { },
448};
449MODULE_DEVICE_TABLE(i2c, da903x_id_table);
450
451static int __remove_subdev(struct device *dev, void *unused)
452{
453 platform_device_unregister(to_platform_device(dev));
454 return 0;
455}
456
457static int da903x_remove_subdevs(struct da903x_chip *chip)
458{
459 return device_for_each_child(chip->dev, NULL, __remove_subdev);
460}
461
462static int da903x_add_subdevs(struct da903x_chip *chip,
463 struct da903x_platform_data *pdata)
464{
465 struct da903x_subdev_info *subdev;
466 struct platform_device *pdev;
467 int i, ret = 0;
468
469 for (i = 0; i < pdata->num_subdevs; i++) {
470 subdev = &pdata->subdevs[i];
471
472 pdev = platform_device_alloc(subdev->name, subdev->id);
473 if (!pdev) {
474 ret = -ENOMEM;
475 goto failed;
476 }
477
478 pdev->dev.parent = chip->dev;
479 pdev->dev.platform_data = subdev->platform_data;
480
481 ret = platform_device_add(pdev);
482 if (ret) {
483 platform_device_put(pdev);
484 goto failed;
485 }
486 }
487 return 0;
488
489failed:
490 da903x_remove_subdevs(chip);
491 return ret;
492}
493
494static int da903x_probe(struct i2c_client *client,
495 const struct i2c_device_id *id)
496{
497 struct da903x_platform_data *pdata = dev_get_platdata(&client->dev);
498 struct da903x_chip *chip;
499 unsigned int tmp;
500 int ret;
501
502 chip = devm_kzalloc(&client->dev, sizeof(struct da903x_chip),
503 GFP_KERNEL);
504 if (chip == NULL)
505 return -ENOMEM;
506
507 chip->client = client;
508 chip->dev = &client->dev;
509 chip->ops = &da903x_ops[id->driver_data];
510
511 mutex_init(&chip->lock);
512 INIT_WORK(&chip->irq_work, da903x_irq_work);
513 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
514
515 i2c_set_clientdata(client, chip);
516
517 ret = chip->ops->init_chip(chip);
518 if (ret)
519 return ret;
520
521
522 chip->events_mask = 0xffffffff;
523 chip->ops->mask_events(chip, chip->events_mask);
524 chip->ops->read_events(chip, &tmp);
525
526 ret = devm_request_irq(&client->dev, client->irq, da903x_irq_handler,
527 IRQF_TRIGGER_FALLING,
528 "da903x", chip);
529 if (ret) {
530 dev_err(&client->dev, "failed to request irq %d\n",
531 client->irq);
532 return ret;
533 }
534
535 return da903x_add_subdevs(chip, pdata);
536}
537
538static int da903x_remove(struct i2c_client *client)
539{
540 struct da903x_chip *chip = i2c_get_clientdata(client);
541
542 da903x_remove_subdevs(chip);
543 return 0;
544}
545
546static struct i2c_driver da903x_driver = {
547 .driver = {
548 .name = "da903x",
549 },
550 .probe = da903x_probe,
551 .remove = da903x_remove,
552 .id_table = da903x_id_table,
553};
554
555static int __init da903x_init(void)
556{
557 return i2c_add_driver(&da903x_driver);
558}
559subsys_initcall(da903x_init);
560
561static void __exit da903x_exit(void)
562{
563 i2c_del_driver(&da903x_driver);
564}
565module_exit(da903x_exit);
566
567MODULE_DESCRIPTION("PMIC Driver for Dialog Semiconductor DA9034");
568MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
569MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
570MODULE_LICENSE("GPL v2");
571
