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(client: aat2870->client, buf: &addr, count: 1); |
107 | if (ret < 0) |
108 | return ret; |
109 | if (ret != 1) |
110 | return -EIO; |
111 | |
112 | ret = i2c_master_recv(client: aat2870->client, buf: val, count: 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(client: aat2870->client, buf: msg, count: 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(lock: &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(lock: &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, val: &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, val: new_val); |
192 | |
193 | out_unlock: |
194 | mutex_unlock(lock: &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(gpio: aat2870->en_pin, value: 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(gpio: aat2870->en_pin, value: 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, fmt: "aat2870 registers\n" ); |
223 | for (addr = 0; addr < AAT2870_REG_NUM; addr++) { |
224 | count += snprintf(buf: buf + count, PAGE_SIZE - count, fmt: "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: buf + count, PAGE_SIZE - count, |
231 | fmt: "0x%02x" , val); |
232 | else |
233 | count += snprintf(buf: buf + count, PAGE_SIZE - count, |
234 | fmt: "<read fail: %d>" , ret); |
235 | |
236 | if (count >= PAGE_SIZE - 1) |
237 | break; |
238 | |
239 | count += snprintf(buf: buf + count, PAGE_SIZE - count, fmt: "\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(to: user_buf, count, ppos, from: buf, available: ret); |
265 | |
266 | kfree(objp: 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(to: buf, from: user_buf, n: 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(s: start, base: 16, res: &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(s: start, base: 16, res: &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(name: "aat2870" , NULL); |
324 | |
325 | debugfs_create_file(name: "regs" , mode: 0644, parent: aat2870->dentry_root, data: aat2870, |
326 | fops: &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 | { |
337 | struct aat2870_platform_data *pdata = dev_get_platdata(dev: &client->dev); |
338 | struct aat2870_data *aat2870; |
339 | int i, j; |
340 | int ret = 0; |
341 | |
342 | aat2870 = devm_kzalloc(dev: &client->dev, size: sizeof(struct aat2870_data), |
343 | GFP_KERNEL); |
344 | if (!aat2870) |
345 | return -ENOMEM; |
346 | |
347 | aat2870->dev = &client->dev; |
348 | aat2870->client = client; |
349 | i2c_set_clientdata(client, data: aat2870); |
350 | |
351 | aat2870->reg_cache = aat2870_regs; |
352 | |
353 | if (pdata->en_pin < 0) |
354 | aat2870->en_pin = -1; |
355 | else |
356 | aat2870->en_pin = pdata->en_pin; |
357 | |
358 | aat2870->init = pdata->init; |
359 | aat2870->uninit = pdata->uninit; |
360 | aat2870->read = aat2870_read; |
361 | aat2870->write = aat2870_write; |
362 | aat2870->update = aat2870_update; |
363 | |
364 | mutex_init(&aat2870->io_lock); |
365 | |
366 | if (aat2870->init) |
367 | aat2870->init(aat2870); |
368 | |
369 | if (aat2870->en_pin >= 0) { |
370 | ret = devm_gpio_request_one(dev: &client->dev, gpio: aat2870->en_pin, |
371 | GPIOF_OUT_INIT_HIGH, label: "aat2870-en" ); |
372 | if (ret < 0) { |
373 | dev_err(&client->dev, |
374 | "Failed to request GPIO %d\n" , aat2870->en_pin); |
375 | return ret; |
376 | } |
377 | } |
378 | |
379 | aat2870_enable(aat2870); |
380 | |
381 | for (i = 0; i < pdata->num_subdevs; i++) { |
382 | for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) { |
383 | if ((pdata->subdevs[i].id == aat2870_devs[j].id) && |
384 | !strcmp(pdata->subdevs[i].name, |
385 | aat2870_devs[j].name)) { |
386 | aat2870_devs[j].platform_data = |
387 | pdata->subdevs[i].platform_data; |
388 | break; |
389 | } |
390 | } |
391 | } |
392 | |
393 | ret = mfd_add_devices(parent: aat2870->dev, id: 0, cells: aat2870_devs, |
394 | ARRAY_SIZE(aat2870_devs), NULL, irq_base: 0, NULL); |
395 | if (ret != 0) { |
396 | dev_err(aat2870->dev, "Failed to add subdev: %d\n" , ret); |
397 | goto out_disable; |
398 | } |
399 | |
400 | aat2870_init_debugfs(aat2870); |
401 | |
402 | return 0; |
403 | |
404 | out_disable: |
405 | aat2870_disable(aat2870); |
406 | return ret; |
407 | } |
408 | |
409 | static int aat2870_i2c_suspend(struct device *dev) |
410 | { |
411 | struct i2c_client *client = to_i2c_client(dev); |
412 | struct aat2870_data *aat2870 = i2c_get_clientdata(client); |
413 | |
414 | aat2870_disable(aat2870); |
415 | |
416 | return 0; |
417 | } |
418 | |
419 | static int aat2870_i2c_resume(struct device *dev) |
420 | { |
421 | struct i2c_client *client = to_i2c_client(dev); |
422 | struct aat2870_data *aat2870 = i2c_get_clientdata(client); |
423 | struct aat2870_register *reg = NULL; |
424 | int i; |
425 | |
426 | aat2870_enable(aat2870); |
427 | |
428 | /* restore registers */ |
429 | for (i = 0; i < AAT2870_REG_NUM; i++) { |
430 | reg = &aat2870->reg_cache[i]; |
431 | if (reg->writeable) |
432 | aat2870->write(aat2870, i, reg->value); |
433 | } |
434 | |
435 | return 0; |
436 | } |
437 | |
438 | static DEFINE_SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend, |
439 | aat2870_i2c_resume); |
440 | |
441 | static const struct i2c_device_id aat2870_i2c_id_table[] = { |
442 | { "aat2870" , 0 }, |
443 | { } |
444 | }; |
445 | |
446 | static struct i2c_driver aat2870_i2c_driver = { |
447 | .driver = { |
448 | .name = "aat2870" , |
449 | .pm = pm_sleep_ptr(&aat2870_pm_ops), |
450 | .suppress_bind_attrs = true, |
451 | }, |
452 | .probe = aat2870_i2c_probe, |
453 | .id_table = aat2870_i2c_id_table, |
454 | }; |
455 | |
456 | static int __init aat2870_init(void) |
457 | { |
458 | return i2c_add_driver(&aat2870_i2c_driver); |
459 | } |
460 | subsys_initcall(aat2870_init); |
461 | |