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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
37 { 0, 1, 0x00 },
38 { 0, 1, 0x16 },
39 { 0, 1, 0x16 },
40 { 0, 1, 0x56 },
41 { 0, 1, 0x56 },
42 { 0, 1, 0x56 },
43 { 0, 1, 0x56 },
44 { 0, 1, 0x56 },
45 { 0, 1, 0x56 },
46 { 0, 1, 0x56 },
47 { 0, 1, 0x56 },
48 { 0, 1, 0x00 },
49 { 0, 1, 0x03 },
50 { 0, 1, 0x03 },
51 { 0, 1, 0x10 },
52 { 0, 1, 0x06 },
53 { 0, 1, 0x00 },
54 { 1, 0, 0x00 },
55 { 0, 1, 0x00 },
56 { 0, 1, 0x00 },
57 { 0, 1, 0x00 },
58 { 0, 1, 0x00 },
59 { 0, 1, 0x00 },
60 { 0, 1, 0x00 },
61 { 0, 1, 0x00 },
62 { 0, 1, 0x00 },
63 { 0, 1, 0x00 },
64 { 0, 1, 0x00 },
65 { 0, 1, 0x00 },
66 { 0, 1, 0x00 },
67 { 0, 1, 0x00 },
68 { 0, 1, 0x00 },
69 { 0, 1, 0x00 },
70 { 0, 1, 0x00 },
71 { 0, 1, 0x00 },
72 { 0, 1, 0x00 },
73 { 0, 1, 0x00 },
74 { 0, 1, 0x00 },
75 { 0, 1, 0x00 },
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
259 if (count >= PAGE_SIZE)
260 count = PAGE_SIZE - 1;
261
262 return count;
263}
264
265static 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
285static 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
329static 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
335static 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
352static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
353{
354 debugfs_remove_recursive(aat2870->dentry_root);
355}
356#else
357static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
358{
359}
360
361static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
362{
363}
364#endif
365
366static 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
441out_disable:
442 aat2870_disable(aat2870);
443 return ret;
444}
445
446static 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
461static 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
471static 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
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
490
491static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
492 aat2870_i2c_resume);
493
494static const struct i2c_device_id aat2870_i2c_id_table[] = {
495 { "aat2870", 0 },
496 { }
497};
498MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
499
500static 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
510static int __init aat2870_init(void)
511{
512 return i2c_add_driver(&aat2870_i2c_driver);
513}
514subsys_initcall(aat2870_init);
515
516static void __exit aat2870_exit(void)
517{
518 i2c_del_driver(&aat2870_i2c_driver);
519}
520module_exit(aat2870_exit);
521
522MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
523MODULE_LICENSE("GPL");
524MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
525
