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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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 |
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 | |
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 | |
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, (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 | |
325 | static const struct file_operations aat2870_reg_fops = { |
326 | .open = simple_open, |
327 | .read = aat2870_reg_read_file, |
328 | .write = aat2870_reg_write_file, |
329 | }; |
330 | |
331 | static 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 | |
348 | static void aat2870_uninit_debugfs(struct aat2870_data *aat2870) |
349 | { |
350 | debugfs_remove_recursive(aat2870->dentry_root); |
351 | } |
352 | #else |
353 | static inline void aat2870_init_debugfs(struct aat2870_data *aat2870) |
354 | { |
355 | } |
356 | |
357 | static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870) |
358 | { |
359 | } |
360 | #endif /* CONFIG_DEBUG_FS */ |
361 | |
362 | static 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) { |
403 | ret = gpio_request_one(aat2870->en_pin, GPIOF_OUT_INIT_HIGH, |
404 | "aat2870-en"); |
405 | if (ret < 0) { |
406 | dev_err(&client->dev, |
407 | "Failed to request GPIO %d\n", aat2870->en_pin); |
408 | goto out_kfree; |
409 | } |
410 | } |
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, NULL); |
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 | |
437 | out_disable: |
438 | aat2870_disable(aat2870); |
439 | if (aat2870->en_pin >= 0) |
440 | gpio_free(aat2870->en_pin); |
441 | out_kfree: |
442 | kfree(aat2870); |
443 | out: |
444 | return ret; |
445 | } |
446 | |
447 | static 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 | |
464 | #ifdef CONFIG_PM_SLEEP |
465 | static int aat2870_i2c_suspend(struct device *dev) |
466 | { |
467 | struct i2c_client *client = to_i2c_client(dev); |
468 | struct aat2870_data *aat2870 = i2c_get_clientdata(client); |
469 | |
470 | aat2870_disable(aat2870); |
471 | |
472 | return 0; |
473 | } |
474 | |
475 | static int aat2870_i2c_resume(struct device *dev) |
476 | { |
477 | struct i2c_client *client = to_i2c_client(dev); |
478 | 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 | } |
493 | #endif /* CONFIG_PM_SLEEP */ |
494 | |
495 | static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend, |
496 | aat2870_i2c_resume); |
497 | |
498 | static const struct i2c_device_id aat2870_i2c_id_table[] = { |
499 | { "aat2870", 0 }, |
500 | { } |
501 | }; |
502 | MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table); |
503 | |
504 | static struct i2c_driver aat2870_i2c_driver = { |
505 | .driver = { |
506 | .name = "aat2870", |
507 | .owner = THIS_MODULE, |
508 | .pm = &aat2870_pm_ops, |
509 | }, |
510 | .probe = aat2870_i2c_probe, |
511 | .remove = aat2870_i2c_remove, |
512 | .id_table = aat2870_i2c_id_table, |
513 | }; |
514 | |
515 | static int __init aat2870_init(void) |
516 | { |
517 | return i2c_add_driver(&aat2870_i2c_driver); |
518 | } |
519 | subsys_initcall(aat2870_init); |
520 | |
521 | static void __exit aat2870_exit(void) |
522 | { |
523 | i2c_del_driver(&aat2870_i2c_driver); |
524 | } |
525 | module_exit(aat2870_exit); |
526 | |
527 | MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870"); |
528 | MODULE_LICENSE("GPL"); |
529 | MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); |
530 |
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