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
35 static 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
78 static 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
__aat2870_read(struct aat2870_data * aat2870,u8 addr,u8 * val)106 static 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
132 out:
133 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
134 return 0;
135 }
136
__aat2870_write(struct aat2870_data * aat2870,u8 addr,u8 val)137 static 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
aat2870_read(struct aat2870_data * aat2870,u8 addr,u8 * val)167 static 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
aat2870_write(struct aat2870_data * aat2870,u8 addr,u8 val)178 static 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
aat2870_update(struct aat2870_data * aat2870,u8 addr,u8 mask,u8 val)189 static 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
207 out_unlock:
208 mutex_unlock(&aat2870->io_lock);
209
210 return ret;
211 }
212
aat2870_enable(struct aat2870_data * aat2870)213 static 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
aat2870_disable(struct aat2870_data * aat2870)221 static 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
aat2870_dump_reg(struct aat2870_data * aat2870,char * buf)230 static 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
aat2870_reg_read_file(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)265 static 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
aat2870_reg_write_file(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)285 static 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];
291 ssize_t buf_size;
292 char *start = buf;
293 unsigned long addr, val;
294 int ret;
295
296 buf_size = min(count, (size_t)(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 ret = kstrtoul(start, 16, &addr);
307 if (ret)
308 return ret;
309
310 if (addr >= AAT2870_REG_NUM) {
311 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
312 return -EINVAL;
313 }
314
315 while (*start == ' ')
316 start++;
317
318 ret = kstrtoul(start, 16, &val);
319 if (ret)
320 return ret;
321
322 ret = aat2870->write(aat2870, (u8)addr, (u8)val);
323 if (ret)
324 return ret;
325
326 return buf_size;
327 }
328
329 static const struct file_operations aat2870_reg_fops = {
330 .open = simple_open,
331 .read = aat2870_reg_read_file,
332 .write = aat2870_reg_write_file,
333 };
334
aat2870_init_debugfs(struct aat2870_data * aat2870)335 static void aat2870_init_debugfs(struct aat2870_data *aat2870)
336 {
337 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
338 if (!aat2870->dentry_root) {
339 dev_warn(aat2870->dev,
340 "Failed to create debugfs root directory\n");
341 return;
342 }
343
344 aat2870->dentry_reg = debugfs_create_file("regs", 0644,
345 aat2870->dentry_root,
346 aat2870, &aat2870_reg_fops);
347 if (!aat2870->dentry_reg)
348 dev_warn(aat2870->dev,
349 "Failed to create debugfs register file\n");
350 }
351
aat2870_uninit_debugfs(struct aat2870_data * aat2870)352 static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
353 {
354 debugfs_remove_recursive(aat2870->dentry_root);
355 }
356 #else
aat2870_init_debugfs(struct aat2870_data * aat2870)357 static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
358 {
359 }
360
aat2870_uninit_debugfs(struct aat2870_data * aat2870)361 static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
362 {
363 }
364 #endif /* CONFIG_DEBUG_FS */
365
aat2870_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)366 static int aat2870_i2c_probe(struct i2c_client *client,
367 const struct i2c_device_id *id)
368 {
369 struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev);
370 struct aat2870_data *aat2870;
371 int i, j;
372 int ret = 0;
373
374 aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
375 GFP_KERNEL);
376 if (!aat2870) {
377 dev_err(&client->dev,
378 "Failed to allocate memory for aat2870\n");
379 return -ENOMEM;
380 }
381
382 aat2870->dev = &client->dev;
383 dev_set_drvdata(aat2870->dev, aat2870);
384
385 aat2870->client = client;
386 i2c_set_clientdata(client, aat2870);
387
388 aat2870->reg_cache = aat2870_regs;
389
390 if (pdata->en_pin < 0)
391 aat2870->en_pin = -1;
392 else
393 aat2870->en_pin = pdata->en_pin;
394
395 aat2870->init = pdata->init;
396 aat2870->uninit = pdata->uninit;
397 aat2870->read = aat2870_read;
398 aat2870->write = aat2870_write;
399 aat2870->update = aat2870_update;
400
401 mutex_init(&aat2870->io_lock);
402
403 if (aat2870->init)
404 aat2870->init(aat2870);
405
406 if (aat2870->en_pin >= 0) {
407 ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
408 GPIOF_OUT_INIT_HIGH, "aat2870-en");
409 if (ret < 0) {
410 dev_err(&client->dev,
411 "Failed to request GPIO %d\n", aat2870->en_pin);
412 return ret;
413 }
414 }
415
416 aat2870_enable(aat2870);
417
418 for (i = 0; i < pdata->num_subdevs; i++) {
419 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
420 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
421 !strcmp(pdata->subdevs[i].name,
422 aat2870_devs[j].name)) {
423 aat2870_devs[j].platform_data =
424 pdata->subdevs[i].platform_data;
425 break;
426 }
427 }
428 }
429
430 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
431 ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
432 if (ret != 0) {
433 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
434 goto out_disable;
435 }
436
437 aat2870_init_debugfs(aat2870);
438
439 return 0;
440
441 out_disable:
442 aat2870_disable(aat2870);
443 return ret;
444 }
445
aat2870_i2c_remove(struct i2c_client * client)446 static int aat2870_i2c_remove(struct i2c_client *client)
447 {
448 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
449
450 aat2870_uninit_debugfs(aat2870);
451
452 mfd_remove_devices(aat2870->dev);
453 aat2870_disable(aat2870);
454 if (aat2870->uninit)
455 aat2870->uninit(aat2870);
456
457 return 0;
458 }
459
460 #ifdef CONFIG_PM_SLEEP
aat2870_i2c_suspend(struct device * dev)461 static int aat2870_i2c_suspend(struct device *dev)
462 {
463 struct i2c_client *client = to_i2c_client(dev);
464 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
465
466 aat2870_disable(aat2870);
467
468 return 0;
469 }
470
aat2870_i2c_resume(struct device * dev)471 static int aat2870_i2c_resume(struct device *dev)
472 {
473 struct i2c_client *client = to_i2c_client(dev);
474 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
475 struct aat2870_register *reg = NULL;
476 int i;
477
478 aat2870_enable(aat2870);
479
480 /* restore registers */
481 for (i = 0; i < AAT2870_REG_NUM; i++) {
482 reg = &aat2870->reg_cache[i];
483 if (reg->writeable)
484 aat2870->write(aat2870, i, reg->value);
485 }
486
487 return 0;
488 }
489 #endif /* CONFIG_PM_SLEEP */
490
491 static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
492 aat2870_i2c_resume);
493
494 static const struct i2c_device_id aat2870_i2c_id_table[] = {
495 { "aat2870", 0 },
496 { }
497 };
498 MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
499
500 static struct i2c_driver aat2870_i2c_driver = {
501 .driver = {
502 .name = "aat2870",
503 .pm = &aat2870_pm_ops,
504 },
505 .probe = aat2870_i2c_probe,
506 .remove = aat2870_i2c_remove,
507 .id_table = aat2870_i2c_id_table,
508 };
509
aat2870_init(void)510 static int __init aat2870_init(void)
511 {
512 return i2c_add_driver(&aat2870_i2c_driver);
513 }
514 subsys_initcall(aat2870_init);
515
aat2870_exit(void)516 static void __exit aat2870_exit(void)
517 {
518 i2c_del_driver(&aat2870_i2c_driver);
519 }
520 module_exit(aat2870_exit);
521
522 MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
523 MODULE_LICENSE("GPL");
524 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
525