blob: 44a3fdbadef40df1e09b12884f44caa46b76f0ac [file] [log] [blame]
Jin Park09d62922011-07-04 19:48:12 +02001/*
2 * linux/drivers/mfd/aat2870-core.c
3 *
4 * Copyright (c) 2011, NVIDIA Corporation.
5 * Author: Jin Park <jinyoungp@nvidia.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/debugfs.h>
26#include <linux/slab.h>
27#include <linux/uaccess.h>
28#include <linux/i2c.h>
29#include <linux/delay.h>
30#include <linux/gpio.h>
31#include <linux/mfd/core.h>
32#include <linux/mfd/aat2870.h>
33#include <linux/regulator/machine.h>
34
35static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
36 /* readable, writeable, value */
37 { 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
38 { 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
39 { 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
40 { 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
41 { 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
42 { 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
43 { 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
44 { 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
45 { 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
46 { 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
47 { 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
48 { 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
49 { 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
50 { 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
51 { 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
52 { 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
53 { 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
54 { 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
55 { 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
56 { 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
57 { 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
58 { 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
59 { 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
60 { 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
61 { 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
62 { 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
63 { 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
64 { 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
65 { 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
66 { 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
67 { 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
68 { 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
69 { 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
70 { 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
71 { 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
72 { 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
73 { 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
74 { 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
75 { 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
76};
77
78static struct mfd_cell aat2870_devs[] = {
79 {
80 .name = "aat2870-backlight",
81 .id = AAT2870_ID_BL,
82 .pdata_size = sizeof(struct aat2870_bl_platform_data),
83 },
84 {
85 .name = "aat2870-regulator",
86 .id = AAT2870_ID_LDOA,
87 .pdata_size = sizeof(struct regulator_init_data),
88 },
89 {
90 .name = "aat2870-regulator",
91 .id = AAT2870_ID_LDOB,
92 .pdata_size = sizeof(struct regulator_init_data),
93 },
94 {
95 .name = "aat2870-regulator",
96 .id = AAT2870_ID_LDOC,
97 .pdata_size = sizeof(struct regulator_init_data),
98 },
99 {
100 .name = "aat2870-regulator",
101 .id = AAT2870_ID_LDOD,
102 .pdata_size = sizeof(struct regulator_init_data),
103 },
104};
105
106static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
107{
108 int ret;
109
110 if (addr >= AAT2870_REG_NUM) {
111 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
112 return -EINVAL;
113 }
114
115 if (!aat2870->reg_cache[addr].readable) {
116 *val = aat2870->reg_cache[addr].value;
117 goto out;
118 }
119
120 ret = i2c_master_send(aat2870->client, &addr, 1);
121 if (ret < 0)
122 return ret;
123 if (ret != 1)
124 return -EIO;
125
126 ret = i2c_master_recv(aat2870->client, val, 1);
127 if (ret < 0)
128 return ret;
129 if (ret != 1)
130 return -EIO;
131
132out:
133 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
134 return 0;
135}
136
137static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
138{
139 u8 msg[2];
140 int ret;
141
142 if (addr >= AAT2870_REG_NUM) {
143 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
144 return -EINVAL;
145 }
146
147 if (!aat2870->reg_cache[addr].writeable) {
148 dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
149 addr);
150 return -EINVAL;
151 }
152
153 msg[0] = addr;
154 msg[1] = val;
155 ret = i2c_master_send(aat2870->client, msg, 2);
156 if (ret < 0)
157 return ret;
158 if (ret != 2)
159 return -EIO;
160
161 aat2870->reg_cache[addr].value = val;
162
163 dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
164 return 0;
165}
166
167static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
168{
169 int ret;
170
171 mutex_lock(&aat2870->io_lock);
172 ret = __aat2870_read(aat2870, addr, val);
173 mutex_unlock(&aat2870->io_lock);
174
175 return ret;
176}
177
178static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
179{
180 int ret;
181
182 mutex_lock(&aat2870->io_lock);
183 ret = __aat2870_write(aat2870, addr, val);
184 mutex_unlock(&aat2870->io_lock);
185
186 return ret;
187}
188
189static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
190 u8 val)
191{
192 int change;
193 u8 old_val, new_val;
194 int ret;
195
196 mutex_lock(&aat2870->io_lock);
197
198 ret = __aat2870_read(aat2870, addr, &old_val);
199 if (ret)
200 goto out_unlock;
201
202 new_val = (old_val & ~mask) | (val & mask);
203 change = old_val != new_val;
204 if (change)
205 ret = __aat2870_write(aat2870, addr, new_val);
206
207out_unlock:
208 mutex_unlock(&aat2870->io_lock);
209
210 return ret;
211}
212
213static inline void aat2870_enable(struct aat2870_data *aat2870)
214{
215 if (aat2870->en_pin >= 0)
216 gpio_set_value(aat2870->en_pin, 1);
217
218 aat2870->is_enable = 1;
219}
220
221static inline void aat2870_disable(struct aat2870_data *aat2870)
222{
223 if (aat2870->en_pin >= 0)
224 gpio_set_value(aat2870->en_pin, 0);
225
226 aat2870->is_enable = 0;
227}
228
229#ifdef CONFIG_DEBUG_FS
230static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
231{
232 u8 addr, val;
233 ssize_t count = 0;
234 int ret;
235
236 count += sprintf(buf, "aat2870 registers\n");
237 for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
238 count += sprintf(buf + count, "0x%02x: ", addr);
239 if (count >= PAGE_SIZE - 1)
240 break;
241
242 ret = aat2870->read(aat2870, addr, &val);
243 if (ret == 0)
244 count += snprintf(buf + count, PAGE_SIZE - count,
245 "0x%02x", val);
246 else
247 count += snprintf(buf + count, PAGE_SIZE - count,
248 "<read fail: %d>", ret);
249
250 if (count >= PAGE_SIZE - 1)
251 break;
252
253 count += snprintf(buf + count, PAGE_SIZE - count, "\n");
254 if (count >= PAGE_SIZE - 1)
255 break;
256 }
257
258 /* Truncate count; min() would cause a warning */
259 if (count >= PAGE_SIZE)
260 count = PAGE_SIZE - 1;
261
262 return count;
263}
264
Jin Park09d62922011-07-04 19:48:12 +0200265static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
266 size_t count, loff_t *ppos)
267{
268 struct aat2870_data *aat2870 = file->private_data;
269 char *buf;
270 ssize_t ret;
271
272 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
273 if (!buf)
274 return -ENOMEM;
275
276 ret = aat2870_dump_reg(aat2870, buf);
277 if (ret >= 0)
278 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
279
280 kfree(buf);
281
282 return ret;
283}
284
285static ssize_t aat2870_reg_write_file(struct file *file,
286 const char __user *user_buf, size_t count,
287 loff_t *ppos)
288{
289 struct aat2870_data *aat2870 = file->private_data;
290 char buf[32];
Jin Parkc38d66a2011-10-04 12:35:07 +0200291 ssize_t buf_size;
Jin Park09d62922011-07-04 19:48:12 +0200292 char *start = buf;
293 unsigned long addr, val;
294 int ret;
295
296 buf_size = min(count, (sizeof(buf)-1));
297 if (copy_from_user(buf, user_buf, buf_size)) {
298 dev_err(aat2870->dev, "Failed to copy from user\n");
299 return -EFAULT;
300 }
301 buf[buf_size] = 0;
302
303 while (*start == ' ')
304 start++;
305
306 addr = simple_strtoul(start, &start, 16);
307 if (addr >= AAT2870_REG_NUM) {
308 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
309 return -EINVAL;
310 }
311
312 while (*start == ' ')
313 start++;
314
315 if (strict_strtoul(start, 16, &val))
316 return -EINVAL;
317
318 ret = aat2870->write(aat2870, (u8)addr, (u8)val);
319 if (ret)
320 return ret;
321
322 return buf_size;
323}
324
325static const struct file_operations aat2870_reg_fops = {
Stephen Boyd234e3402012-04-05 14:25:11 -0700326 .open = simple_open,
Jin Park09d62922011-07-04 19:48:12 +0200327 .read = aat2870_reg_read_file,
328 .write = aat2870_reg_write_file,
329};
330
331static void aat2870_init_debugfs(struct aat2870_data *aat2870)
332{
333 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
334 if (!aat2870->dentry_root) {
335 dev_warn(aat2870->dev,
336 "Failed to create debugfs root directory\n");
337 return;
338 }
339
340 aat2870->dentry_reg = debugfs_create_file("regs", 0644,
341 aat2870->dentry_root,
342 aat2870, &aat2870_reg_fops);
343 if (!aat2870->dentry_reg)
344 dev_warn(aat2870->dev,
345 "Failed to create debugfs register file\n");
346}
347
348static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
349{
350 debugfs_remove_recursive(aat2870->dentry_root);
351}
352#else
353static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
354{
355}
356
357static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
358{
359}
360#endif /* CONFIG_DEBUG_FS */
361
362static int aat2870_i2c_probe(struct i2c_client *client,
363 const struct i2c_device_id *id)
364{
365 struct aat2870_platform_data *pdata = client->dev.platform_data;
366 struct aat2870_data *aat2870;
367 int i, j;
368 int ret = 0;
369
370 aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
371 if (!aat2870) {
372 dev_err(&client->dev,
373 "Failed to allocate memory for aat2870\n");
374 ret = -ENOMEM;
375 goto out;
376 }
377
378 aat2870->dev = &client->dev;
379 dev_set_drvdata(aat2870->dev, aat2870);
380
381 aat2870->client = client;
382 i2c_set_clientdata(client, aat2870);
383
384 aat2870->reg_cache = aat2870_regs;
385
386 if (pdata->en_pin < 0)
387 aat2870->en_pin = -1;
388 else
389 aat2870->en_pin = pdata->en_pin;
390
391 aat2870->init = pdata->init;
392 aat2870->uninit = pdata->uninit;
393 aat2870->read = aat2870_read;
394 aat2870->write = aat2870_write;
395 aat2870->update = aat2870_update;
396
397 mutex_init(&aat2870->io_lock);
398
399 if (aat2870->init)
400 aat2870->init(aat2870);
401
402 if (aat2870->en_pin >= 0) {
Axel Linaced7602011-12-01 09:47:54 +0800403 ret = gpio_request_one(aat2870->en_pin, GPIOF_OUT_INIT_HIGH,
404 "aat2870-en");
Jin Park09d62922011-07-04 19:48:12 +0200405 if (ret < 0) {
406 dev_err(&client->dev,
407 "Failed to request GPIO %d\n", aat2870->en_pin);
408 goto out_kfree;
409 }
Jin Park09d62922011-07-04 19:48:12 +0200410 }
411
412 aat2870_enable(aat2870);
413
414 for (i = 0; i < pdata->num_subdevs; i++) {
415 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
416 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
417 !strcmp(pdata->subdevs[i].name,
418 aat2870_devs[j].name)) {
419 aat2870_devs[j].platform_data =
420 pdata->subdevs[i].platform_data;
421 break;
422 }
423 }
424 }
425
426 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
427 ARRAY_SIZE(aat2870_devs), NULL, 0);
428 if (ret != 0) {
429 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
430 goto out_disable;
431 }
432
433 aat2870_init_debugfs(aat2870);
434
435 return 0;
436
437out_disable:
438 aat2870_disable(aat2870);
439 if (aat2870->en_pin >= 0)
440 gpio_free(aat2870->en_pin);
441out_kfree:
442 kfree(aat2870);
443out:
444 return ret;
445}
446
447static int aat2870_i2c_remove(struct i2c_client *client)
448{
449 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
450
451 aat2870_uninit_debugfs(aat2870);
452
453 mfd_remove_devices(aat2870->dev);
454 aat2870_disable(aat2870);
455 if (aat2870->en_pin >= 0)
456 gpio_free(aat2870->en_pin);
457 if (aat2870->uninit)
458 aat2870->uninit(aat2870);
459 kfree(aat2870);
460
461 return 0;
462}
463
Mark Brown5214e562011-12-28 17:40:28 +0000464#ifdef CONFIG_PM_SLEEP
465static int aat2870_i2c_suspend(struct device *dev)
Jin Park09d62922011-07-04 19:48:12 +0200466{
Mark Brown5214e562011-12-28 17:40:28 +0000467 struct i2c_client *client = to_i2c_client(dev);
Jin Park09d62922011-07-04 19:48:12 +0200468 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
469
470 aat2870_disable(aat2870);
471
472 return 0;
473}
474
Mark Brown5214e562011-12-28 17:40:28 +0000475static int aat2870_i2c_resume(struct device *dev)
Jin Park09d62922011-07-04 19:48:12 +0200476{
Mark Brown5214e562011-12-28 17:40:28 +0000477 struct i2c_client *client = to_i2c_client(dev);
Jin Park09d62922011-07-04 19:48:12 +0200478 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
479 struct aat2870_register *reg = NULL;
480 int i;
481
482 aat2870_enable(aat2870);
483
484 /* restore registers */
485 for (i = 0; i < AAT2870_REG_NUM; i++) {
486 reg = &aat2870->reg_cache[i];
487 if (reg->writeable)
488 aat2870->write(aat2870, i, reg->value);
489 }
490
491 return 0;
492}
Mark Brown5214e562011-12-28 17:40:28 +0000493#endif /* CONFIG_PM_SLEEP */
494
495static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
496 aat2870_i2c_resume);
Jin Park09d62922011-07-04 19:48:12 +0200497
Axel Lind4e94862011-12-19 20:02:22 +0800498static const struct i2c_device_id aat2870_i2c_id_table[] = {
Jin Park09d62922011-07-04 19:48:12 +0200499 { "aat2870", 0 },
500 { }
501};
502MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
503
504static struct i2c_driver aat2870_i2c_driver = {
505 .driver = {
506 .name = "aat2870",
507 .owner = THIS_MODULE,
Mark Brown5214e562011-12-28 17:40:28 +0000508 .pm = &aat2870_pm_ops,
Jin Park09d62922011-07-04 19:48:12 +0200509 },
510 .probe = aat2870_i2c_probe,
511 .remove = aat2870_i2c_remove,
Jin Park09d62922011-07-04 19:48:12 +0200512 .id_table = aat2870_i2c_id_table,
513};
514
515static int __init aat2870_init(void)
516{
517 return i2c_add_driver(&aat2870_i2c_driver);
518}
519subsys_initcall(aat2870_init);
520
521static void __exit aat2870_exit(void)
522{
523 i2c_del_driver(&aat2870_i2c_driver);
524}
525module_exit(aat2870_exit);
526
527MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
528MODULE_LICENSE("GPL");
529MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");