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10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/err.h>
14#include <linux/gpio.h>
15#include <linux/i2c.h>
16#include <linux/mfd/core.h>
17#include <linux/regmap.h>
18#include <linux/seq_file.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21
22#include <linux/mfd/lm3533.h>
23
24
25#define LM3533_BOOST_OVP_MASK 0x06
26#define LM3533_BOOST_OVP_SHIFT 1
27
28#define LM3533_BOOST_FREQ_MASK 0x01
29#define LM3533_BOOST_FREQ_SHIFT 0
30
31#define LM3533_BL_ID_MASK 1
32#define LM3533_LED_ID_MASK 3
33#define LM3533_BL_ID_MAX 1
34#define LM3533_LED_ID_MAX 3
35
36#define LM3533_HVLED_ID_MAX 2
37#define LM3533_LVLED_ID_MAX 5
38
39#define LM3533_REG_OUTPUT_CONF1 0x10
40#define LM3533_REG_OUTPUT_CONF2 0x11
41#define LM3533_REG_BOOST_PWM 0x2c
42
43#define LM3533_REG_MAX 0xb2
44
45
46static struct mfd_cell lm3533_als_devs[] = {
47 {
48 .name = "lm3533-als",
49 .id = -1,
50 },
51};
52
53static struct mfd_cell lm3533_bl_devs[] = {
54 {
55 .name = "lm3533-backlight",
56 .id = 0,
57 },
58 {
59 .name = "lm3533-backlight",
60 .id = 1,
61 },
62};
63
64static struct mfd_cell lm3533_led_devs[] = {
65 {
66 .name = "lm3533-leds",
67 .id = 0,
68 },
69 {
70 .name = "lm3533-leds",
71 .id = 1,
72 },
73 {
74 .name = "lm3533-leds",
75 .id = 2,
76 },
77 {
78 .name = "lm3533-leds",
79 .id = 3,
80 },
81};
82
83int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
84{
85 int tmp;
86 int ret;
87
88 ret = regmap_read(lm3533->regmap, reg, &tmp);
89 if (ret < 0) {
90 dev_err(lm3533->dev, "failed to read register %02x: %d\n",
91 reg, ret);
92 return ret;
93 }
94
95 *val = tmp;
96
97 dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
98
99 return ret;
100}
101EXPORT_SYMBOL_GPL(lm3533_read);
102
103int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
104{
105 int ret;
106
107 dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);
108
109 ret = regmap_write(lm3533->regmap, reg, val);
110 if (ret < 0) {
111 dev_err(lm3533->dev, "failed to write register %02x: %d\n",
112 reg, ret);
113 }
114
115 return ret;
116}
117EXPORT_SYMBOL_GPL(lm3533_write);
118
119int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
120{
121 int ret;
122
123 dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);
124
125 ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
126 if (ret < 0) {
127 dev_err(lm3533->dev, "failed to update register %02x: %d\n",
128 reg, ret);
129 }
130
131 return ret;
132}
133EXPORT_SYMBOL_GPL(lm3533_update);
134
135static int lm3533_set_boost_freq(struct lm3533 *lm3533,
136 enum lm3533_boost_freq freq)
137{
138 int ret;
139
140 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
141 freq << LM3533_BOOST_FREQ_SHIFT,
142 LM3533_BOOST_FREQ_MASK);
143 if (ret)
144 dev_err(lm3533->dev, "failed to set boost frequency\n");
145
146 return ret;
147}
148
149
150static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
151 enum lm3533_boost_ovp ovp)
152{
153 int ret;
154
155 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
156 ovp << LM3533_BOOST_OVP_SHIFT,
157 LM3533_BOOST_OVP_MASK);
158 if (ret)
159 dev_err(lm3533->dev, "failed to set boost ovp\n");
160
161 return ret;
162}
163
164
165
166
167static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
168{
169 u8 val;
170 u8 mask;
171 int shift;
172 int ret;
173
174 if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
175 return -EINVAL;
176
177 if (bl > LM3533_BL_ID_MAX)
178 return -EINVAL;
179
180 shift = hvled - 1;
181 mask = LM3533_BL_ID_MASK << shift;
182 val = bl << shift;
183
184 ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
185 if (ret)
186 dev_err(lm3533->dev, "failed to set hvled config\n");
187
188 return ret;
189}
190
191
192
193
194static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
195{
196 u8 reg;
197 u8 val;
198 u8 mask;
199 int shift;
200 int ret;
201
202 if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
203 return -EINVAL;
204
205 if (led > LM3533_LED_ID_MAX)
206 return -EINVAL;
207
208 if (lvled < 4) {
209 reg = LM3533_REG_OUTPUT_CONF1;
210 shift = 2 * lvled;
211 } else {
212 reg = LM3533_REG_OUTPUT_CONF2;
213 shift = 2 * (lvled - 4);
214 }
215
216 mask = LM3533_LED_ID_MASK << shift;
217 val = led << shift;
218
219 ret = lm3533_update(lm3533, reg, val, mask);
220 if (ret)
221 dev_err(lm3533->dev, "failed to set lvled config\n");
222
223 return ret;
224}
225
226static void lm3533_enable(struct lm3533 *lm3533)
227{
228 if (gpio_is_valid(lm3533->gpio_hwen))
229 gpio_set_value(lm3533->gpio_hwen, 1);
230}
231
232static void lm3533_disable(struct lm3533 *lm3533)
233{
234 if (gpio_is_valid(lm3533->gpio_hwen))
235 gpio_set_value(lm3533->gpio_hwen, 0);
236}
237
238enum lm3533_attribute_type {
239 LM3533_ATTR_TYPE_BACKLIGHT,
240 LM3533_ATTR_TYPE_LED,
241};
242
243struct lm3533_device_attribute {
244 struct device_attribute dev_attr;
245 enum lm3533_attribute_type type;
246 union {
247 struct {
248 u8 id;
249 } output;
250 } u;
251};
252
253#define to_lm3533_dev_attr(_attr) \
254 container_of(_attr, struct lm3533_device_attribute, dev_attr)
255
256static ssize_t show_output(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 struct lm3533 *lm3533 = dev_get_drvdata(dev);
260 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
261 int id = lattr->u.output.id;
262 u8 reg;
263 u8 val;
264 u8 mask;
265 int shift;
266 int ret;
267
268 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
269 reg = LM3533_REG_OUTPUT_CONF1;
270 shift = id - 1;
271 mask = LM3533_BL_ID_MASK << shift;
272 } else {
273 if (id < 4) {
274 reg = LM3533_REG_OUTPUT_CONF1;
275 shift = 2 * id;
276 } else {
277 reg = LM3533_REG_OUTPUT_CONF2;
278 shift = 2 * (id - 4);
279 }
280 mask = LM3533_LED_ID_MASK << shift;
281 }
282
283 ret = lm3533_read(lm3533, reg, &val);
284 if (ret)
285 return ret;
286
287 val = (val & mask) >> shift;
288
289 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
290}
291
292static ssize_t store_output(struct device *dev,
293 struct device_attribute *attr,
294 const char *buf, size_t len)
295{
296 struct lm3533 *lm3533 = dev_get_drvdata(dev);
297 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
298 int id = lattr->u.output.id;
299 u8 val;
300 int ret;
301
302 if (kstrtou8(buf, 0, &val))
303 return -EINVAL;
304
305 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
306 ret = lm3533_set_hvled_config(lm3533, id, val);
307 else
308 ret = lm3533_set_lvled_config(lm3533, id, val);
309
310 if (ret)
311 return ret;
312
313 return len;
314}
315
316#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
317 struct lm3533_device_attribute lm3533_dev_attr_##_name = \
318 { .dev_attr = __ATTR(_name, _mode, _show, _store), \
319 .type = _type, \
320 .u.output = { .id = _id }, }
321
322#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
323 LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
324 show_output, store_output, _type, _id)
325
326#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
327 LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
328#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
329 LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
330
331
332
333
334
335
336static LM3533_OUTPUT_HVLED_ATTR_RW(1);
337static LM3533_OUTPUT_HVLED_ATTR_RW(2);
338static LM3533_OUTPUT_LVLED_ATTR_RW(1);
339static LM3533_OUTPUT_LVLED_ATTR_RW(2);
340static LM3533_OUTPUT_LVLED_ATTR_RW(3);
341static LM3533_OUTPUT_LVLED_ATTR_RW(4);
342static LM3533_OUTPUT_LVLED_ATTR_RW(5);
343
344static struct attribute *lm3533_attributes[] = {
345 &lm3533_dev_attr_output_hvled1.dev_attr.attr,
346 &lm3533_dev_attr_output_hvled2.dev_attr.attr,
347 &lm3533_dev_attr_output_lvled1.dev_attr.attr,
348 &lm3533_dev_attr_output_lvled2.dev_attr.attr,
349 &lm3533_dev_attr_output_lvled3.dev_attr.attr,
350 &lm3533_dev_attr_output_lvled4.dev_attr.attr,
351 &lm3533_dev_attr_output_lvled5.dev_attr.attr,
352 NULL,
353};
354
355#define to_dev_attr(_attr) \
356 container_of(_attr, struct device_attribute, attr)
357
358static umode_t lm3533_attr_is_visible(struct kobject *kobj,
359 struct attribute *attr, int n)
360{
361 struct device *dev = kobj_to_dev(kobj);
362 struct lm3533 *lm3533 = dev_get_drvdata(dev);
363 struct device_attribute *dattr = to_dev_attr(attr);
364 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
365 enum lm3533_attribute_type type = lattr->type;
366 umode_t mode = attr->mode;
367
368 if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
369 mode = 0;
370 else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
371 mode = 0;
372
373 return mode;
374};
375
376static struct attribute_group lm3533_attribute_group = {
377 .is_visible = lm3533_attr_is_visible,
378 .attrs = lm3533_attributes
379};
380
381static int lm3533_device_als_init(struct lm3533 *lm3533)
382{
383 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
384 int ret;
385
386 if (!pdata->als)
387 return 0;
388
389 lm3533_als_devs[0].platform_data = pdata->als;
390 lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);
391
392 ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL,
393 0, NULL);
394 if (ret) {
395 dev_err(lm3533->dev, "failed to add ALS device\n");
396 return ret;
397 }
398
399 lm3533->have_als = 1;
400
401 return 0;
402}
403
404static int lm3533_device_bl_init(struct lm3533 *lm3533)
405{
406 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
407 int i;
408 int ret;
409
410 if (!pdata->backlights || pdata->num_backlights == 0)
411 return 0;
412
413 if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
414 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
415
416 for (i = 0; i < pdata->num_backlights; ++i) {
417 lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
418 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
419 }
420
421 ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
422 pdata->num_backlights, NULL, 0, NULL);
423 if (ret) {
424 dev_err(lm3533->dev, "failed to add backlight devices\n");
425 return ret;
426 }
427
428 lm3533->have_backlights = 1;
429
430 return 0;
431}
432
433static int lm3533_device_led_init(struct lm3533 *lm3533)
434{
435 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
436 int i;
437 int ret;
438
439 if (!pdata->leds || pdata->num_leds == 0)
440 return 0;
441
442 if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
443 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
444
445 for (i = 0; i < pdata->num_leds; ++i) {
446 lm3533_led_devs[i].platform_data = &pdata->leds[i];
447 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
448 }
449
450 ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
451 pdata->num_leds, NULL, 0, NULL);
452 if (ret) {
453 dev_err(lm3533->dev, "failed to add LED devices\n");
454 return ret;
455 }
456
457 lm3533->have_leds = 1;
458
459 return 0;
460}
461
462static int lm3533_device_setup(struct lm3533 *lm3533,
463 struct lm3533_platform_data *pdata)
464{
465 int ret;
466
467 ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
468 if (ret)
469 return ret;
470
471 return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
472}
473
474static int lm3533_device_init(struct lm3533 *lm3533)
475{
476 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
477 int ret;
478
479 dev_dbg(lm3533->dev, "%s\n", __func__);
480
481 if (!pdata) {
482 dev_err(lm3533->dev, "no platform data\n");
483 return -EINVAL;
484 }
485
486 lm3533->gpio_hwen = pdata->gpio_hwen;
487
488 dev_set_drvdata(lm3533->dev, lm3533);
489
490 if (gpio_is_valid(lm3533->gpio_hwen)) {
491 ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen,
492 GPIOF_OUT_INIT_LOW, "lm3533-hwen");
493 if (ret < 0) {
494 dev_err(lm3533->dev,
495 "failed to request HWEN GPIO %d\n",
496 lm3533->gpio_hwen);
497 return ret;
498 }
499 }
500
501 lm3533_enable(lm3533);
502
503 ret = lm3533_device_setup(lm3533, pdata);
504 if (ret)
505 goto err_disable;
506
507 lm3533_device_als_init(lm3533);
508 lm3533_device_bl_init(lm3533);
509 lm3533_device_led_init(lm3533);
510
511 ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
512 if (ret < 0) {
513 dev_err(lm3533->dev, "failed to create sysfs attributes\n");
514 goto err_unregister;
515 }
516
517 return 0;
518
519err_unregister:
520 mfd_remove_devices(lm3533->dev);
521err_disable:
522 lm3533_disable(lm3533);
523
524 return ret;
525}
526
527static void lm3533_device_exit(struct lm3533 *lm3533)
528{
529 dev_dbg(lm3533->dev, "%s\n", __func__);
530
531 sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
532
533 mfd_remove_devices(lm3533->dev);
534 lm3533_disable(lm3533);
535}
536
537static bool lm3533_readable_register(struct device *dev, unsigned int reg)
538{
539 switch (reg) {
540 case 0x10 ... 0x2c:
541 case 0x30 ... 0x38:
542 case 0x40 ... 0x45:
543 case 0x50 ... 0x57:
544 case 0x60 ... 0x6e:
545 case 0x70 ... 0x75:
546 case 0x80 ... 0x85:
547 case 0x90 ... 0x95:
548 case 0xa0 ... 0xa5:
549 case 0xb0 ... 0xb2:
550 return true;
551 default:
552 return false;
553 }
554}
555
556static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
557{
558 switch (reg) {
559 case 0x34 ... 0x36:
560 case 0x37 ... 0x38:
561 case 0xb0 ... 0xb1:
562 return true;
563 default:
564 return false;
565 }
566}
567
568static bool lm3533_precious_register(struct device *dev, unsigned int reg)
569{
570 switch (reg) {
571 case 0x34:
572 return true;
573 default:
574 return false;
575 }
576}
577
578static const struct regmap_config regmap_config = {
579 .reg_bits = 8,
580 .val_bits = 8,
581 .max_register = LM3533_REG_MAX,
582 .readable_reg = lm3533_readable_register,
583 .volatile_reg = lm3533_volatile_register,
584 .precious_reg = lm3533_precious_register,
585};
586
587static int lm3533_i2c_probe(struct i2c_client *i2c,
588 const struct i2c_device_id *id)
589{
590 struct lm3533 *lm3533;
591
592 dev_dbg(&i2c->dev, "%s\n", __func__);
593
594 lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
595 if (!lm3533)
596 return -ENOMEM;
597
598 i2c_set_clientdata(i2c, lm3533);
599
600 lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config);
601 if (IS_ERR(lm3533->regmap))
602 return PTR_ERR(lm3533->regmap);
603
604 lm3533->dev = &i2c->dev;
605 lm3533->irq = i2c->irq;
606
607 return lm3533_device_init(lm3533);
608}
609
610static int lm3533_i2c_remove(struct i2c_client *i2c)
611{
612 struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
613
614 dev_dbg(&i2c->dev, "%s\n", __func__);
615
616 lm3533_device_exit(lm3533);
617
618 return 0;
619}
620
621static const struct i2c_device_id lm3533_i2c_ids[] = {
622 { "lm3533", 0 },
623 { },
624};
625MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
626
627static struct i2c_driver lm3533_i2c_driver = {
628 .driver = {
629 .name = "lm3533",
630 },
631 .id_table = lm3533_i2c_ids,
632 .probe = lm3533_i2c_probe,
633 .remove = lm3533_i2c_remove,
634};
635
636static int __init lm3533_i2c_init(void)
637{
638 return i2c_add_driver(&lm3533_i2c_driver);
639}
640subsys_initcall(lm3533_i2c_init);
641
642static void __exit lm3533_i2c_exit(void)
643{
644 i2c_del_driver(&lm3533_i2c_driver);
645}
646module_exit(lm3533_i2c_exit);
647
648MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
649MODULE_DESCRIPTION("LM3533 Core");
650MODULE_LICENSE("GPL");
651
