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1/*
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
265static int aat2870_reg_open_file(struct inode *inode, struct file *file)
266{
267 file->private_data = inode->i_private;
268
269 return 0;
270}
271
272static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
273 size_t count, loff_t *ppos)
274{
275 struct aat2870_data *aat2870 = file->private_data;
276 char *buf;
277 ssize_t ret;
278
279 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
280 if (!buf)
281 return -ENOMEM;
282
283 ret = aat2870_dump_reg(aat2870, buf);
284 if (ret >= 0)
285 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
286
287 kfree(buf);
288
289 return ret;
290}
291
292static ssize_t aat2870_reg_write_file(struct file *file,
293 const char __user *user_buf, size_t count,
294 loff_t *ppos)
295{
296 struct aat2870_data *aat2870 = file->private_data;
297 char buf[32];
298 int buf_size;
299 char *start = buf;
300 unsigned long addr, val;
301 int ret;
302
303 buf_size = min(count, (sizeof(buf)-1));
304 if (copy_from_user(buf, user_buf, buf_size)) {
305 dev_err(aat2870->dev, "Failed to copy from user\n");
306 return -EFAULT;
307 }
308 buf[buf_size] = 0;
309
310 while (*start == ' ')
311 start++;
312
313 addr = simple_strtoul(start, &start, 16);
314 if (addr >= AAT2870_REG_NUM) {
315 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
316 return -EINVAL;
317 }
318
319 while (*start == ' ')
320 start++;
321
322 if (strict_strtoul(start, 16, &val))
323 return -EINVAL;
324
325 ret = aat2870->write(aat2870, (u8)addr, (u8)val);
326 if (ret)
327 return ret;
328
329 return buf_size;
330}
331
332static const struct file_operations aat2870_reg_fops = {
333 .open = aat2870_reg_open_file,
334 .read = aat2870_reg_read_file,
335 .write = aat2870_reg_write_file,
336};
337
338static void aat2870_init_debugfs(struct aat2870_data *aat2870)
339{
340 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
341 if (!aat2870->dentry_root) {
342 dev_warn(aat2870->dev,
343 "Failed to create debugfs root directory\n");
344 return;
345 }
346
347 aat2870->dentry_reg = debugfs_create_file("regs", 0644,
348 aat2870->dentry_root,
349 aat2870, &aat2870_reg_fops);
350 if (!aat2870->dentry_reg)
351 dev_warn(aat2870->dev,
352 "Failed to create debugfs register file\n");
353}
354
355static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
356{
357 debugfs_remove_recursive(aat2870->dentry_root);
358}
359#else
360static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
361{
362}
363
364static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
365{
366}
367#endif /* CONFIG_DEBUG_FS */
368
369static int aat2870_i2c_probe(struct i2c_client *client,
370 const struct i2c_device_id *id)
371{
372 struct aat2870_platform_data *pdata = client->dev.platform_data;
373 struct aat2870_data *aat2870;
374 int i, j;
375 int ret = 0;
376
377 aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
378 if (!aat2870) {
379 dev_err(&client->dev,
380 "Failed to allocate memory for aat2870\n");
381 ret = -ENOMEM;
382 goto out;
383 }
384
385 aat2870->dev = &client->dev;
386 dev_set_drvdata(aat2870->dev, aat2870);
387
388 aat2870->client = client;
389 i2c_set_clientdata(client, aat2870);
390
391 aat2870->reg_cache = aat2870_regs;
392
393 if (pdata->en_pin < 0)
394 aat2870->en_pin = -1;
395 else
396 aat2870->en_pin = pdata->en_pin;
397
398 aat2870->init = pdata->init;
399 aat2870->uninit = pdata->uninit;
400 aat2870->read = aat2870_read;
401 aat2870->write = aat2870_write;
402 aat2870->update = aat2870_update;
403
404 mutex_init(&aat2870->io_lock);
405
406 if (aat2870->init)
407 aat2870->init(aat2870);
408
409 if (aat2870->en_pin >= 0) {
410 ret = gpio_request(aat2870->en_pin, "aat2870-en");
411 if (ret < 0) {
412 dev_err(&client->dev,
413 "Failed to request GPIO %d\n", aat2870->en_pin);
414 goto out_kfree;
415 }
416 gpio_direction_output(aat2870->en_pin, 1);
417 }
418
419 aat2870_enable(aat2870);
420
421 for (i = 0; i < pdata->num_subdevs; i++) {
422 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
423 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
424 !strcmp(pdata->subdevs[i].name,
425 aat2870_devs[j].name)) {
426 aat2870_devs[j].platform_data =
427 pdata->subdevs[i].platform_data;
428 break;
429 }
430 }
431 }
432
433 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
434 ARRAY_SIZE(aat2870_devs), NULL, 0);
435 if (ret != 0) {
436 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
437 goto out_disable;
438 }
439
440 aat2870_init_debugfs(aat2870);
441
442 return 0;
443
444out_disable:
445 aat2870_disable(aat2870);
446 if (aat2870->en_pin >= 0)
447 gpio_free(aat2870->en_pin);
448out_kfree:
449 kfree(aat2870);
450out:
451 return ret;
452}
453
454static int aat2870_i2c_remove(struct i2c_client *client)
455{
456 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
457
458 aat2870_uninit_debugfs(aat2870);
459
460 mfd_remove_devices(aat2870->dev);
461 aat2870_disable(aat2870);
462 if (aat2870->en_pin >= 0)
463 gpio_free(aat2870->en_pin);
464 if (aat2870->uninit)
465 aat2870->uninit(aat2870);
466 kfree(aat2870);
467
468 return 0;
469}
470
471#ifdef CONFIG_PM
472static int aat2870_i2c_suspend(struct i2c_client *client, pm_message_t state)
473{
474 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
475
476 aat2870_disable(aat2870);
477
478 return 0;
479}
480
481static int aat2870_i2c_resume(struct i2c_client *client)
482{
483 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
484 struct aat2870_register *reg = NULL;
485 int i;
486
487 aat2870_enable(aat2870);
488
489 /* restore registers */
490 for (i = 0; i < AAT2870_REG_NUM; i++) {
491 reg = &aat2870->reg_cache[i];
492 if (reg->writeable)
493 aat2870->write(aat2870, i, reg->value);
494 }
495
496 return 0;
497}
498#else
499#define aat2870_i2c_suspend NULL
500#define aat2870_i2c_resume NULL
501#endif /* CONFIG_PM */
502
503static struct i2c_device_id aat2870_i2c_id_table[] = {
504 { "aat2870", 0 },
505 { }
506};
507MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
508
509static struct i2c_driver aat2870_i2c_driver = {
510 .driver = {
511 .name = "aat2870",
512 .owner = THIS_MODULE,
513 },
514 .probe = aat2870_i2c_probe,
515 .remove = aat2870_i2c_remove,
516 .suspend = aat2870_i2c_suspend,
517 .resume = aat2870_i2c_resume,
518 .id_table = aat2870_i2c_id_table,
519};
520
521static int __init aat2870_init(void)
522{
523 return i2c_add_driver(&aat2870_i2c_driver);
524}
525subsys_initcall(aat2870_init);
526
527static void __exit aat2870_exit(void)
528{
529 i2c_del_driver(&aat2870_i2c_driver);
530}
531module_exit(aat2870_exit);
532
533MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
534MODULE_LICENSE("GPL");
535MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/mfd/aat2870-core.c
4 *
5 * Copyright (c) 2011, NVIDIA Corporation.
6 * Author: Jin Park <jinyoungp@nvidia.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/debugfs.h>
12#include <linux/slab.h>
13#include <linux/uaccess.h>
14#include <linux/i2c.h>
15#include <linux/delay.h>
16#include <linux/gpio.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/aat2870.h>
19#include <linux/regulator/machine.h>
20
21static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
22 /* readable, writeable, value */
23 { 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
24 { 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
25 { 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
26 { 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
27 { 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
28 { 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
29 { 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
30 { 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
31 { 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
32 { 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
33 { 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
34 { 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
35 { 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
36 { 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
37 { 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
38 { 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
39 { 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
40 { 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
41 { 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
42 { 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
43 { 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
44 { 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
45 { 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
46 { 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
47 { 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
48 { 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
49 { 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
50 { 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
51 { 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
52 { 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
53 { 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
54 { 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
55 { 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
56 { 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
57 { 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
58 { 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
59 { 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
60 { 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
61 { 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
62};
63
64static struct mfd_cell aat2870_devs[] = {
65 {
66 .name = "aat2870-backlight",
67 .id = AAT2870_ID_BL,
68 .pdata_size = sizeof(struct aat2870_bl_platform_data),
69 },
70 {
71 .name = "aat2870-regulator",
72 .id = AAT2870_ID_LDOA,
73 .pdata_size = sizeof(struct regulator_init_data),
74 },
75 {
76 .name = "aat2870-regulator",
77 .id = AAT2870_ID_LDOB,
78 .pdata_size = sizeof(struct regulator_init_data),
79 },
80 {
81 .name = "aat2870-regulator",
82 .id = AAT2870_ID_LDOC,
83 .pdata_size = sizeof(struct regulator_init_data),
84 },
85 {
86 .name = "aat2870-regulator",
87 .id = AAT2870_ID_LDOD,
88 .pdata_size = sizeof(struct regulator_init_data),
89 },
90};
91
92static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
93{
94 int ret;
95
96 if (addr >= AAT2870_REG_NUM) {
97 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
98 return -EINVAL;
99 }
100
101 if (!aat2870->reg_cache[addr].readable) {
102 *val = aat2870->reg_cache[addr].value;
103 goto out;
104 }
105
106 ret = i2c_master_send(aat2870->client, &addr, 1);
107 if (ret < 0)
108 return ret;
109 if (ret != 1)
110 return -EIO;
111
112 ret = i2c_master_recv(aat2870->client, val, 1);
113 if (ret < 0)
114 return ret;
115 if (ret != 1)
116 return -EIO;
117
118out:
119 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
120 return 0;
121}
122
123static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
124{
125 u8 msg[2];
126 int ret;
127
128 if (addr >= AAT2870_REG_NUM) {
129 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
130 return -EINVAL;
131 }
132
133 if (!aat2870->reg_cache[addr].writeable) {
134 dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
135 addr);
136 return -EINVAL;
137 }
138
139 msg[0] = addr;
140 msg[1] = val;
141 ret = i2c_master_send(aat2870->client, msg, 2);
142 if (ret < 0)
143 return ret;
144 if (ret != 2)
145 return -EIO;
146
147 aat2870->reg_cache[addr].value = val;
148
149 dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
150 return 0;
151}
152
153static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
154{
155 int ret;
156
157 mutex_lock(&aat2870->io_lock);
158 ret = __aat2870_read(aat2870, addr, val);
159 mutex_unlock(&aat2870->io_lock);
160
161 return ret;
162}
163
164static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
165{
166 int ret;
167
168 mutex_lock(&aat2870->io_lock);
169 ret = __aat2870_write(aat2870, addr, val);
170 mutex_unlock(&aat2870->io_lock);
171
172 return ret;
173}
174
175static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
176 u8 val)
177{
178 int change;
179 u8 old_val, new_val;
180 int ret;
181
182 mutex_lock(&aat2870->io_lock);
183
184 ret = __aat2870_read(aat2870, addr, &old_val);
185 if (ret)
186 goto out_unlock;
187
188 new_val = (old_val & ~mask) | (val & mask);
189 change = old_val != new_val;
190 if (change)
191 ret = __aat2870_write(aat2870, addr, new_val);
192
193out_unlock:
194 mutex_unlock(&aat2870->io_lock);
195
196 return ret;
197}
198
199static inline void aat2870_enable(struct aat2870_data *aat2870)
200{
201 if (aat2870->en_pin >= 0)
202 gpio_set_value(aat2870->en_pin, 1);
203
204 aat2870->is_enable = 1;
205}
206
207static inline void aat2870_disable(struct aat2870_data *aat2870)
208{
209 if (aat2870->en_pin >= 0)
210 gpio_set_value(aat2870->en_pin, 0);
211
212 aat2870->is_enable = 0;
213}
214
215#ifdef CONFIG_DEBUG_FS
216static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
217{
218 u8 addr, val;
219 ssize_t count = 0;
220 int ret;
221
222 count += sprintf(buf, "aat2870 registers\n");
223 for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
224 count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
225 if (count >= PAGE_SIZE - 1)
226 break;
227
228 ret = aat2870->read(aat2870, addr, &val);
229 if (ret == 0)
230 count += snprintf(buf + count, PAGE_SIZE - count,
231 "0x%02x", val);
232 else
233 count += snprintf(buf + count, PAGE_SIZE - count,
234 "<read fail: %d>", ret);
235
236 if (count >= PAGE_SIZE - 1)
237 break;
238
239 count += snprintf(buf + count, PAGE_SIZE - count, "\n");
240 if (count >= PAGE_SIZE - 1)
241 break;
242 }
243
244 /* Truncate count; min() would cause a warning */
245 if (count >= PAGE_SIZE)
246 count = PAGE_SIZE - 1;
247
248 return count;
249}
250
251static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
252 size_t count, loff_t *ppos)
253{
254 struct aat2870_data *aat2870 = file->private_data;
255 char *buf;
256 ssize_t ret;
257
258 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
259 if (!buf)
260 return -ENOMEM;
261
262 ret = aat2870_dump_reg(aat2870, buf);
263 if (ret >= 0)
264 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
265
266 kfree(buf);
267
268 return ret;
269}
270
271static ssize_t aat2870_reg_write_file(struct file *file,
272 const char __user *user_buf, size_t count,
273 loff_t *ppos)
274{
275 struct aat2870_data *aat2870 = file->private_data;
276 char buf[32];
277 ssize_t buf_size;
278 char *start = buf;
279 unsigned long addr, val;
280 int ret;
281
282 buf_size = min(count, (size_t)(sizeof(buf)-1));
283 if (copy_from_user(buf, user_buf, buf_size)) {
284 dev_err(aat2870->dev, "Failed to copy from user\n");
285 return -EFAULT;
286 }
287 buf[buf_size] = 0;
288
289 while (*start == ' ')
290 start++;
291
292 ret = kstrtoul(start, 16, &addr);
293 if (ret)
294 return ret;
295
296 if (addr >= AAT2870_REG_NUM) {
297 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
298 return -EINVAL;
299 }
300
301 while (*start == ' ')
302 start++;
303
304 ret = kstrtoul(start, 16, &val);
305 if (ret)
306 return ret;
307
308 ret = aat2870->write(aat2870, (u8)addr, (u8)val);
309 if (ret)
310 return ret;
311
312 return buf_size;
313}
314
315static const struct file_operations aat2870_reg_fops = {
316 .open = simple_open,
317 .read = aat2870_reg_read_file,
318 .write = aat2870_reg_write_file,
319};
320
321static void aat2870_init_debugfs(struct aat2870_data *aat2870)
322{
323 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
324
325 debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870,
326 &aat2870_reg_fops);
327}
328
329#else
330static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
331{
332}
333#endif /* CONFIG_DEBUG_FS */
334
335static int aat2870_i2c_probe(struct i2c_client *client,
336 const struct i2c_device_id *id)
337{
338 struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev);
339 struct aat2870_data *aat2870;
340 int i, j;
341 int ret = 0;
342
343 aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
344 GFP_KERNEL);
345 if (!aat2870)
346 return -ENOMEM;
347
348 aat2870->dev = &client->dev;
349 dev_set_drvdata(aat2870->dev, aat2870);
350
351 aat2870->client = client;
352 i2c_set_clientdata(client, aat2870);
353
354 aat2870->reg_cache = aat2870_regs;
355
356 if (pdata->en_pin < 0)
357 aat2870->en_pin = -1;
358 else
359 aat2870->en_pin = pdata->en_pin;
360
361 aat2870->init = pdata->init;
362 aat2870->uninit = pdata->uninit;
363 aat2870->read = aat2870_read;
364 aat2870->write = aat2870_write;
365 aat2870->update = aat2870_update;
366
367 mutex_init(&aat2870->io_lock);
368
369 if (aat2870->init)
370 aat2870->init(aat2870);
371
372 if (aat2870->en_pin >= 0) {
373 ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
374 GPIOF_OUT_INIT_HIGH, "aat2870-en");
375 if (ret < 0) {
376 dev_err(&client->dev,
377 "Failed to request GPIO %d\n", aat2870->en_pin);
378 return ret;
379 }
380 }
381
382 aat2870_enable(aat2870);
383
384 for (i = 0; i < pdata->num_subdevs; i++) {
385 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
386 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
387 !strcmp(pdata->subdevs[i].name,
388 aat2870_devs[j].name)) {
389 aat2870_devs[j].platform_data =
390 pdata->subdevs[i].platform_data;
391 break;
392 }
393 }
394 }
395
396 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
397 ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
398 if (ret != 0) {
399 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
400 goto out_disable;
401 }
402
403 aat2870_init_debugfs(aat2870);
404
405 return 0;
406
407out_disable:
408 aat2870_disable(aat2870);
409 return ret;
410}
411
412#ifdef CONFIG_PM_SLEEP
413static int aat2870_i2c_suspend(struct device *dev)
414{
415 struct i2c_client *client = to_i2c_client(dev);
416 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
417
418 aat2870_disable(aat2870);
419
420 return 0;
421}
422
423static int aat2870_i2c_resume(struct device *dev)
424{
425 struct i2c_client *client = to_i2c_client(dev);
426 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
427 struct aat2870_register *reg = NULL;
428 int i;
429
430 aat2870_enable(aat2870);
431
432 /* restore registers */
433 for (i = 0; i < AAT2870_REG_NUM; i++) {
434 reg = &aat2870->reg_cache[i];
435 if (reg->writeable)
436 aat2870->write(aat2870, i, reg->value);
437 }
438
439 return 0;
440}
441#endif /* CONFIG_PM_SLEEP */
442
443static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
444 aat2870_i2c_resume);
445
446static const struct i2c_device_id aat2870_i2c_id_table[] = {
447 { "aat2870", 0 },
448 { }
449};
450
451static struct i2c_driver aat2870_i2c_driver = {
452 .driver = {
453 .name = "aat2870",
454 .pm = &aat2870_pm_ops,
455 .suppress_bind_attrs = true,
456 },
457 .probe = aat2870_i2c_probe,
458 .id_table = aat2870_i2c_id_table,
459};
460
461static int __init aat2870_init(void)
462{
463 return i2c_add_driver(&aat2870_i2c_driver);
464}
465subsys_initcall(aat2870_init);