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Johan Hovold16c5c022012-05-03 12:26:36 +02001/*
2 * lm3533-core.c -- LM3533 Core
3 *
4 * Copyright (C) 2011-2012 Texas Instruments
5 *
6 * Author: Johan Hovold <jhovold@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/err.h>
18#include <linux/gpio.h>
19#include <linux/i2c.h>
20#include <linux/mfd/core.h>
21#include <linux/regmap.h>
22#include <linux/seq_file.h>
23#include <linux/slab.h>
24#include <linux/uaccess.h>
25
26#include <linux/mfd/lm3533.h>
27
28
Johan Hovold16c5c022012-05-03 12:26:36 +020029#define LM3533_BOOST_OVP_MASK 0x06
30#define LM3533_BOOST_OVP_SHIFT 1
31
Johan Hovold16c5c022012-05-03 12:26:36 +020032#define LM3533_BOOST_FREQ_MASK 0x01
33#define LM3533_BOOST_FREQ_SHIFT 0
34
35#define LM3533_BL_ID_MASK 1
36#define LM3533_LED_ID_MASK 3
37#define LM3533_BL_ID_MAX 1
38#define LM3533_LED_ID_MAX 3
39
40#define LM3533_HVLED_ID_MAX 2
41#define LM3533_LVLED_ID_MAX 5
42
43#define LM3533_REG_OUTPUT_CONF1 0x10
44#define LM3533_REG_OUTPUT_CONF2 0x11
45#define LM3533_REG_BOOST_PWM 0x2c
46
47#define LM3533_REG_MAX 0xb2
48
49
50static struct mfd_cell lm3533_als_devs[] = {
51 {
52 .name = "lm3533-als",
53 .id = -1,
54 },
55};
56
57static struct mfd_cell lm3533_bl_devs[] = {
58 {
59 .name = "lm3533-backlight",
60 .id = 0,
61 },
62 {
63 .name = "lm3533-backlight",
64 .id = 1,
65 },
66};
67
68static struct mfd_cell lm3533_led_devs[] = {
69 {
70 .name = "lm3533-leds",
71 .id = 0,
72 },
73 {
74 .name = "lm3533-leds",
75 .id = 1,
76 },
77 {
78 .name = "lm3533-leds",
79 .id = 2,
80 },
81 {
82 .name = "lm3533-leds",
83 .id = 3,
84 },
85};
86
87int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
88{
89 int tmp;
90 int ret;
91
92 ret = regmap_read(lm3533->regmap, reg, &tmp);
93 if (ret < 0) {
94 dev_err(lm3533->dev, "failed to read register %02x: %d\n",
95 reg, ret);
96 return ret;
97 }
98
99 *val = tmp;
100
101 dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
102
103 return ret;
104}
105EXPORT_SYMBOL_GPL(lm3533_read);
106
107int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
108{
109 int ret;
110
111 dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);
112
113 ret = regmap_write(lm3533->regmap, reg, val);
114 if (ret < 0) {
115 dev_err(lm3533->dev, "failed to write register %02x: %d\n",
116 reg, ret);
117 }
118
119 return ret;
120}
121EXPORT_SYMBOL_GPL(lm3533_write);
122
123int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
124{
125 int ret;
126
127 dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);
128
Axel Lin664dd062012-05-10 23:35:02 +0800129 ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
Johan Hovold16c5c022012-05-03 12:26:36 +0200130 if (ret < 0) {
131 dev_err(lm3533->dev, "failed to update register %02x: %d\n",
132 reg, ret);
133 }
134
135 return ret;
136}
137EXPORT_SYMBOL_GPL(lm3533_update);
138
Johan Hovoldd9055dc2012-05-10 14:11:28 +0200139static int lm3533_set_boost_freq(struct lm3533 *lm3533,
140 enum lm3533_boost_freq freq)
141{
142 int ret;
143
144 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
145 freq << LM3533_BOOST_FREQ_SHIFT,
146 LM3533_BOOST_FREQ_MASK);
147 if (ret)
148 dev_err(lm3533->dev, "failed to set boost frequency\n");
149
150 return ret;
151}
152
153
154static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
155 enum lm3533_boost_ovp ovp)
156{
157 int ret;
158
159 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
160 ovp << LM3533_BOOST_OVP_SHIFT,
161 LM3533_BOOST_OVP_MASK);
162 if (ret)
163 dev_err(lm3533->dev, "failed to set boost ovp\n");
164
165 return ret;
166}
167
Johan Hovold16c5c022012-05-03 12:26:36 +0200168/*
169 * HVLED output config -- output hvled controlled by backlight bl
170 */
171static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
172{
173 u8 val;
174 u8 mask;
175 int shift;
176 int ret;
177
178 if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
179 return -EINVAL;
180
181 if (bl > LM3533_BL_ID_MAX)
182 return -EINVAL;
183
184 shift = hvled - 1;
185 mask = LM3533_BL_ID_MASK << shift;
186 val = bl << shift;
187
188 ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
189 if (ret)
190 dev_err(lm3533->dev, "failed to set hvled config\n");
191
192 return ret;
193}
194
195/*
196 * LVLED output config -- output lvled controlled by LED led
197 */
198static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
199{
200 u8 reg;
201 u8 val;
202 u8 mask;
203 int shift;
204 int ret;
205
206 if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
207 return -EINVAL;
208
209 if (led > LM3533_LED_ID_MAX)
210 return -EINVAL;
211
212 if (lvled < 4) {
213 reg = LM3533_REG_OUTPUT_CONF1;
214 shift = 2 * lvled;
215 } else {
216 reg = LM3533_REG_OUTPUT_CONF2;
217 shift = 2 * (lvled - 4);
218 }
219
220 mask = LM3533_LED_ID_MASK << shift;
221 val = led << shift;
222
223 ret = lm3533_update(lm3533, reg, val, mask);
224 if (ret)
225 dev_err(lm3533->dev, "failed to set lvled config\n");
226
227 return ret;
228}
229
230static void lm3533_enable(struct lm3533 *lm3533)
231{
232 if (gpio_is_valid(lm3533->gpio_hwen))
233 gpio_set_value(lm3533->gpio_hwen, 1);
234}
235
236static void lm3533_disable(struct lm3533 *lm3533)
237{
238 if (gpio_is_valid(lm3533->gpio_hwen))
239 gpio_set_value(lm3533->gpio_hwen, 0);
240}
241
242enum lm3533_attribute_type {
243 LM3533_ATTR_TYPE_BACKLIGHT,
244 LM3533_ATTR_TYPE_LED,
245};
246
247struct lm3533_device_attribute {
248 struct device_attribute dev_attr;
249 enum lm3533_attribute_type type;
250 union {
251 struct {
252 u8 id;
253 } output;
Johan Hovold16c5c022012-05-03 12:26:36 +0200254 } u;
255};
256
257#define to_lm3533_dev_attr(_attr) \
258 container_of(_attr, struct lm3533_device_attribute, dev_attr)
259
Johan Hovold16c5c022012-05-03 12:26:36 +0200260static ssize_t show_output(struct device *dev,
261 struct device_attribute *attr, char *buf)
262{
263 struct lm3533 *lm3533 = dev_get_drvdata(dev);
264 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
265 int id = lattr->u.output.id;
266 u8 reg;
267 u8 val;
268 u8 mask;
269 int shift;
270 int ret;
271
272 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
273 reg = LM3533_REG_OUTPUT_CONF1;
274 shift = id - 1;
275 mask = LM3533_BL_ID_MASK << shift;
276 } else {
277 if (id < 4) {
278 reg = LM3533_REG_OUTPUT_CONF1;
279 shift = 2 * id;
280 } else {
281 reg = LM3533_REG_OUTPUT_CONF2;
282 shift = 2 * (id - 4);
283 }
284 mask = LM3533_LED_ID_MASK << shift;
285 }
286
287 ret = lm3533_read(lm3533, reg, &val);
288 if (ret)
289 return ret;
290
291 val = (val & mask) >> shift;
292
293 return scnprintf(buf, PAGE_SIZE, "%u\n", val);
294}
295
296static ssize_t store_output(struct device *dev,
297 struct device_attribute *attr,
298 const char *buf, size_t len)
299{
300 struct lm3533 *lm3533 = dev_get_drvdata(dev);
301 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
302 int id = lattr->u.output.id;
303 u8 val;
304 int ret;
305
306 if (kstrtou8(buf, 0, &val))
307 return -EINVAL;
308
309 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
310 ret = lm3533_set_hvled_config(lm3533, id, val);
311 else
312 ret = lm3533_set_lvled_config(lm3533, id, val);
313
314 if (ret)
315 return ret;
316
317 return len;
318}
319
320#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
321 struct lm3533_device_attribute lm3533_dev_attr_##_name = \
322 { .dev_attr = __ATTR(_name, _mode, _show, _store), \
323 .type = _type, \
324 .u.output = { .id = _id }, }
325
326#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
327 LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
328 show_output, store_output, _type, _id)
329
330#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
331 LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
332#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
333 LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
334/*
335 * Output config:
336 *
337 * output_hvled<nr> 0-1
338 * output_lvled<nr> 0-3
339 */
340static LM3533_OUTPUT_HVLED_ATTR_RW(1);
341static LM3533_OUTPUT_HVLED_ATTR_RW(2);
342static LM3533_OUTPUT_LVLED_ATTR_RW(1);
343static LM3533_OUTPUT_LVLED_ATTR_RW(2);
344static LM3533_OUTPUT_LVLED_ATTR_RW(3);
345static LM3533_OUTPUT_LVLED_ATTR_RW(4);
346static LM3533_OUTPUT_LVLED_ATTR_RW(5);
347
348static struct attribute *lm3533_attributes[] = {
Johan Hovold16c5c022012-05-03 12:26:36 +0200349 &lm3533_dev_attr_output_hvled1.dev_attr.attr,
350 &lm3533_dev_attr_output_hvled2.dev_attr.attr,
351 &lm3533_dev_attr_output_lvled1.dev_attr.attr,
352 &lm3533_dev_attr_output_lvled2.dev_attr.attr,
353 &lm3533_dev_attr_output_lvled3.dev_attr.attr,
354 &lm3533_dev_attr_output_lvled4.dev_attr.attr,
355 &lm3533_dev_attr_output_lvled5.dev_attr.attr,
356 NULL,
357};
358
359#define to_dev_attr(_attr) \
360 container_of(_attr, struct device_attribute, attr)
361
Dan Carpenter168755e2012-05-12 14:01:04 +0300362static umode_t lm3533_attr_is_visible(struct kobject *kobj,
Johan Hovold16c5c022012-05-03 12:26:36 +0200363 struct attribute *attr, int n)
364{
365 struct device *dev = container_of(kobj, struct device, kobj);
366 struct lm3533 *lm3533 = dev_get_drvdata(dev);
367 struct device_attribute *dattr = to_dev_attr(attr);
368 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
369 enum lm3533_attribute_type type = lattr->type;
Johan Hovold60908852012-05-20 15:16:10 +0200370 umode_t mode = attr->mode;
Johan Hovold16c5c022012-05-03 12:26:36 +0200371
372 if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
373 mode = 0;
374 else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
375 mode = 0;
376
377 return mode;
378};
379
380static struct attribute_group lm3533_attribute_group = {
381 .is_visible = lm3533_attr_is_visible,
382 .attrs = lm3533_attributes
383};
384
385static int __devinit lm3533_device_als_init(struct lm3533 *lm3533)
386{
387 struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
388 int ret;
389
390 if (!pdata->als)
391 return 0;
392
393 lm3533_als_devs[0].platform_data = pdata->als;
394 lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);
395
396 ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL, 0);
397 if (ret) {
398 dev_err(lm3533->dev, "failed to add ALS device\n");
399 return ret;
400 }
401
402 lm3533->have_als = 1;
403
404 return 0;
405}
406
407static int __devinit lm3533_device_bl_init(struct lm3533 *lm3533)
408{
409 struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
410 int i;
411 int ret;
412
413 if (!pdata->backlights || pdata->num_backlights == 0)
414 return 0;
415
416 if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
417 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
418
419 for (i = 0; i < pdata->num_backlights; ++i) {
420 lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
421 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
422 }
423
424 ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
425 pdata->num_backlights, NULL, 0);
426 if (ret) {
427 dev_err(lm3533->dev, "failed to add backlight devices\n");
428 return ret;
429 }
430
431 lm3533->have_backlights = 1;
432
433 return 0;
434}
435
436static int __devinit lm3533_device_led_init(struct lm3533 *lm3533)
437{
438 struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
439 int i;
440 int ret;
441
442 if (!pdata->leds || pdata->num_leds == 0)
443 return 0;
444
445 if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
446 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
447
448 for (i = 0; i < pdata->num_leds; ++i) {
449 lm3533_led_devs[i].platform_data = &pdata->leds[i];
450 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
451 }
452
453 ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
454 pdata->num_leds, NULL, 0);
455 if (ret) {
456 dev_err(lm3533->dev, "failed to add LED devices\n");
457 return ret;
458 }
459
460 lm3533->have_leds = 1;
461
462 return 0;
463}
464
Johan Hovoldd9055dc2012-05-10 14:11:28 +0200465static int __devinit lm3533_device_setup(struct lm3533 *lm3533,
466 struct lm3533_platform_data *pdata)
467{
468 int ret;
469
470 ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
471 if (ret)
472 return ret;
473
474 ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
475 if (ret)
476 return ret;
477
478 return 0;
479}
480
Johan Hovold16c5c022012-05-03 12:26:36 +0200481static int __devinit lm3533_device_init(struct lm3533 *lm3533)
482{
483 struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
484 int ret;
485
486 dev_dbg(lm3533->dev, "%s\n", __func__);
487
488 if (!pdata) {
489 dev_err(lm3533->dev, "no platform data\n");
490 return -EINVAL;
491 }
492
493 lm3533->gpio_hwen = pdata->gpio_hwen;
494
495 dev_set_drvdata(lm3533->dev, lm3533);
496
497 if (gpio_is_valid(lm3533->gpio_hwen)) {
498 ret = gpio_request_one(lm3533->gpio_hwen, GPIOF_OUT_INIT_LOW,
499 "lm3533-hwen");
500 if (ret < 0) {
501 dev_err(lm3533->dev,
502 "failed to request HWEN GPIO %d\n",
503 lm3533->gpio_hwen);
504 return ret;
505 }
506 }
507
508 lm3533_enable(lm3533);
509
Johan Hovoldd9055dc2012-05-10 14:11:28 +0200510 ret = lm3533_device_setup(lm3533, pdata);
511 if (ret)
512 goto err_disable;
513
Johan Hovold16c5c022012-05-03 12:26:36 +0200514 lm3533_device_als_init(lm3533);
515 lm3533_device_bl_init(lm3533);
516 lm3533_device_led_init(lm3533);
517
518 ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
519 if (ret < 0) {
520 dev_err(lm3533->dev, "failed to create sysfs attributes\n");
521 goto err_unregister;
522 }
523
524 return 0;
525
526err_unregister:
527 mfd_remove_devices(lm3533->dev);
Johan Hovoldd9055dc2012-05-10 14:11:28 +0200528err_disable:
Johan Hovold16c5c022012-05-03 12:26:36 +0200529 lm3533_disable(lm3533);
530 if (gpio_is_valid(lm3533->gpio_hwen))
531 gpio_free(lm3533->gpio_hwen);
532
533 return ret;
534}
535
536static void __devexit lm3533_device_exit(struct lm3533 *lm3533)
537{
538 dev_dbg(lm3533->dev, "%s\n", __func__);
539
540 sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
541
542 mfd_remove_devices(lm3533->dev);
543 lm3533_disable(lm3533);
544 if (gpio_is_valid(lm3533->gpio_hwen))
545 gpio_free(lm3533->gpio_hwen);
546}
547
548static bool lm3533_readable_register(struct device *dev, unsigned int reg)
549{
550 switch (reg) {
551 case 0x10 ... 0x2c:
552 case 0x30 ... 0x38:
553 case 0x40 ... 0x45:
554 case 0x50 ... 0x57:
555 case 0x60 ... 0x6e:
556 case 0x70 ... 0x75:
557 case 0x80 ... 0x85:
558 case 0x90 ... 0x95:
559 case 0xa0 ... 0xa5:
560 case 0xb0 ... 0xb2:
561 return true;
562 default:
563 return false;
564 }
565}
566
567static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
568{
569 switch (reg) {
Johan Hovoldc48bf152012-05-18 20:22:46 +0200570 case 0x34 ... 0x36: /* zone */
Johan Hovold16c5c022012-05-03 12:26:36 +0200571 case 0x37 ... 0x38: /* adc */
572 case 0xb0 ... 0xb1: /* fault */
573 return true;
574 default:
575 return false;
576 }
577}
578
579static bool lm3533_precious_register(struct device *dev, unsigned int reg)
580{
581 switch (reg) {
582 case 0x34: /* zone */
583 return true;
584 default:
585 return false;
586 }
587}
588
589static struct regmap_config regmap_config = {
590 .reg_bits = 8,
591 .val_bits = 8,
592 .max_register = LM3533_REG_MAX,
593 .readable_reg = lm3533_readable_register,
594 .volatile_reg = lm3533_volatile_register,
595 .precious_reg = lm3533_precious_register,
596};
597
598static int __devinit lm3533_i2c_probe(struct i2c_client *i2c,
599 const struct i2c_device_id *id)
600{
601 struct lm3533 *lm3533;
602 int ret;
603
604 dev_dbg(&i2c->dev, "%s\n", __func__);
605
Johan Hovoldfa648e52012-05-15 19:24:53 +0200606 lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
Johan Hovold16c5c022012-05-03 12:26:36 +0200607 if (!lm3533)
608 return -ENOMEM;
609
610 i2c_set_clientdata(i2c, lm3533);
611
Johan Hovoldfa648e52012-05-15 19:24:53 +0200612 lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
613 if (IS_ERR(lm3533->regmap))
614 return PTR_ERR(lm3533->regmap);
Johan Hovold16c5c022012-05-03 12:26:36 +0200615
616 lm3533->dev = &i2c->dev;
617 lm3533->irq = i2c->irq;
618
619 ret = lm3533_device_init(lm3533);
620 if (ret)
Johan Hovoldfa648e52012-05-15 19:24:53 +0200621 return ret;
Johan Hovold16c5c022012-05-03 12:26:36 +0200622
623 return 0;
Johan Hovold16c5c022012-05-03 12:26:36 +0200624}
625
626static int __devexit lm3533_i2c_remove(struct i2c_client *i2c)
627{
628 struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
629
630 dev_dbg(&i2c->dev, "%s\n", __func__);
631
632 lm3533_device_exit(lm3533);
Johan Hovold16c5c022012-05-03 12:26:36 +0200633
634 return 0;
635}
636
637static const struct i2c_device_id lm3533_i2c_ids[] = {
638 { "lm3533", 0 },
639 { },
640};
641MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
642
643static struct i2c_driver lm3533_i2c_driver = {
644 .driver = {
645 .name = "lm3533",
646 .owner = THIS_MODULE,
647 },
648 .id_table = lm3533_i2c_ids,
649 .probe = lm3533_i2c_probe,
650 .remove = __devexit_p(lm3533_i2c_remove),
651};
652
653static int __init lm3533_i2c_init(void)
654{
655 return i2c_add_driver(&lm3533_i2c_driver);
656}
657subsys_initcall(lm3533_i2c_init);
658
659static void __exit lm3533_i2c_exit(void)
660{
661 i2c_del_driver(&lm3533_i2c_driver);
662}
663module_exit(lm3533_i2c_exit);
664
665MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
666MODULE_DESCRIPTION("LM3533 Core");
667MODULE_LICENSE("GPL");