GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / aat2870-core.c
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
21 static 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
64 static 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
92 static 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
118 out:
119         dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
120         return 0;
121 }
122
123 static 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
153 static 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
164 static 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
175 static 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
193 out_unlock:
194         mutex_unlock(&aat2870->io_lock);
195
196         return ret;
197 }
198
199 static 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
207 static 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
216 static 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
251 static 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
271 static 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
315 static 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
321 static 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
330 static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
331 {
332 }
333 #endif /* CONFIG_DEBUG_FS */
334
335 static 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
407 out_disable:
408         aat2870_disable(aat2870);
409         return ret;
410 }
411
412 #ifdef CONFIG_PM_SLEEP
413 static 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
423 static 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
443 static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
444                          aat2870_i2c_resume);
445
446 static const struct i2c_device_id aat2870_i2c_id_table[] = {
447         { "aat2870", 0 },
448         { }
449 };
450
451 static 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
461 static int __init aat2870_init(void)
462 {
463         return i2c_add_driver(&aat2870_i2c_driver);
464 }
465 subsys_initcall(aat2870_init);