2 * linux/drivers/mfd/aat2870-core.c
4 * Copyright (c) 2011, NVIDIA Corporation.
5 * Author: Jin Park <jinyoungp@nvidia.com>
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.
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.
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
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>
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 */
78 static struct mfd_cell aat2870_devs[] = {
80 .name = "aat2870-backlight",
84 .name = "aat2870-regulator",
85 .id = AAT2870_ID_LDOA,
88 .name = "aat2870-regulator",
89 .id = AAT2870_ID_LDOB,
92 .name = "aat2870-regulator",
93 .id = AAT2870_ID_LDOC,
96 .name = "aat2870-regulator",
97 .id = AAT2870_ID_LDOD,
101 static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
105 if (addr >= AAT2870_REG_NUM) {
106 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
110 if (!aat2870->reg_cache[addr].readable) {
111 *val = aat2870->reg_cache[addr].value;
115 ret = i2c_master_send(aat2870->client, &addr, 1);
121 ret = i2c_master_recv(aat2870->client, val, 1);
128 dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
132 static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
137 if (addr >= AAT2870_REG_NUM) {
138 dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
142 if (!aat2870->reg_cache[addr].writeable) {
143 dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
150 ret = i2c_master_send(aat2870->client, msg, 2);
156 aat2870->reg_cache[addr].value = val;
158 dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
162 static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
166 mutex_lock(&aat2870->io_lock);
167 ret = __aat2870_read(aat2870, addr, val);
168 mutex_unlock(&aat2870->io_lock);
173 static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
177 mutex_lock(&aat2870->io_lock);
178 ret = __aat2870_write(aat2870, addr, val);
179 mutex_unlock(&aat2870->io_lock);
184 static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
191 mutex_lock(&aat2870->io_lock);
193 ret = __aat2870_read(aat2870, addr, &old_val);
197 new_val = (old_val & ~mask) | (val & mask);
198 change = old_val != new_val;
200 ret = __aat2870_write(aat2870, addr, new_val);
203 mutex_unlock(&aat2870->io_lock);
208 static inline void aat2870_enable(struct aat2870_data *aat2870)
210 if (aat2870->en_pin >= 0)
211 gpio_set_value(aat2870->en_pin, 1);
213 aat2870->is_enable = 1;
216 static inline void aat2870_disable(struct aat2870_data *aat2870)
218 if (aat2870->en_pin >= 0)
219 gpio_set_value(aat2870->en_pin, 0);
221 aat2870->is_enable = 0;
224 #ifdef CONFIG_DEBUG_FS
225 static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
231 count += sprintf(buf, "aat2870 registers\n");
232 for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
233 count += sprintf(buf + count, "0x%02x: ", addr);
234 if (count >= PAGE_SIZE - 1)
237 ret = aat2870->read(aat2870, addr, &val);
239 count += snprintf(buf + count, PAGE_SIZE - count,
242 count += snprintf(buf + count, PAGE_SIZE - count,
243 "<read fail: %d>", ret);
245 if (count >= PAGE_SIZE - 1)
248 count += snprintf(buf + count, PAGE_SIZE - count, "\n");
249 if (count >= PAGE_SIZE - 1)
253 /* Truncate count; min() would cause a warning */
254 if (count >= PAGE_SIZE)
255 count = PAGE_SIZE - 1;
260 static int aat2870_reg_open_file(struct inode *inode, struct file *file)
262 file->private_data = inode->i_private;
267 static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
268 size_t count, loff_t *ppos)
270 struct aat2870_data *aat2870 = file->private_data;
274 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
278 ret = aat2870_dump_reg(aat2870, buf);
280 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
287 static ssize_t aat2870_reg_write_file(struct file *file,
288 const char __user *user_buf, size_t count,
291 struct aat2870_data *aat2870 = file->private_data;
295 unsigned long addr, val;
298 buf_size = min(count, (sizeof(buf)-1));
299 if (copy_from_user(buf, user_buf, buf_size)) {
300 dev_err(aat2870->dev, "Failed to copy from user\n");
305 while (*start == ' ')
308 addr = simple_strtoul(start, &start, 16);
309 if (addr >= AAT2870_REG_NUM) {
310 dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
314 while (*start == ' ')
317 if (strict_strtoul(start, 16, &val))
320 ret = aat2870->write(aat2870, (u8)addr, (u8)val);
327 static const struct file_operations aat2870_reg_fops = {
328 .open = aat2870_reg_open_file,
329 .read = aat2870_reg_read_file,
330 .write = aat2870_reg_write_file,
333 static void aat2870_init_debugfs(struct aat2870_data *aat2870)
335 aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
336 if (!aat2870->dentry_root) {
337 dev_warn(aat2870->dev,
338 "Failed to create debugfs root directory\n");
342 aat2870->dentry_reg = debugfs_create_file("regs", 0644,
343 aat2870->dentry_root,
344 aat2870, &aat2870_reg_fops);
345 if (!aat2870->dentry_reg)
346 dev_warn(aat2870->dev,
347 "Failed to create debugfs register file\n");
350 static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
352 debugfs_remove_recursive(aat2870->dentry_root);
355 static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
359 static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
362 #endif /* CONFIG_DEBUG_FS */
364 static int aat2870_i2c_probe(struct i2c_client *client,
365 const struct i2c_device_id *id)
367 struct aat2870_platform_data *pdata = client->dev.platform_data;
368 struct aat2870_data *aat2870;
372 aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
374 dev_err(&client->dev,
375 "Failed to allocate memory for aat2870\n");
380 aat2870->dev = &client->dev;
381 dev_set_drvdata(aat2870->dev, aat2870);
383 aat2870->client = client;
384 i2c_set_clientdata(client, aat2870);
386 aat2870->reg_cache = aat2870_regs;
388 if (pdata->en_pin < 0)
389 aat2870->en_pin = -1;
391 aat2870->en_pin = pdata->en_pin;
393 aat2870->init = pdata->init;
394 aat2870->uninit = pdata->uninit;
395 aat2870->read = aat2870_read;
396 aat2870->write = aat2870_write;
397 aat2870->update = aat2870_update;
399 mutex_init(&aat2870->io_lock);
402 aat2870->init(aat2870);
404 if (aat2870->en_pin >= 0) {
405 ret = gpio_request(aat2870->en_pin, "aat2870-en");
407 dev_err(&client->dev,
408 "Failed to request GPIO %d\n", aat2870->en_pin);
411 gpio_direction_output(aat2870->en_pin, 1);
414 aat2870_enable(aat2870);
416 for (i = 0; i < pdata->num_subdevs; i++) {
417 for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
418 if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
419 !strcmp(pdata->subdevs[i].name,
420 aat2870_devs[j].name)) {
421 aat2870_devs[j].mfd_data =
422 pdata->subdevs[i].platform_data;
428 ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
429 ARRAY_SIZE(aat2870_devs), NULL, 0);
431 dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
435 aat2870_init_debugfs(aat2870);
440 aat2870_disable(aat2870);
441 if (aat2870->en_pin >= 0)
442 gpio_free(aat2870->en_pin);
449 static int aat2870_i2c_remove(struct i2c_client *client)
451 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
453 aat2870_uninit_debugfs(aat2870);
455 mfd_remove_devices(aat2870->dev);
456 aat2870_disable(aat2870);
457 if (aat2870->en_pin >= 0)
458 gpio_free(aat2870->en_pin);
460 aat2870->uninit(aat2870);
467 static int aat2870_i2c_suspend(struct i2c_client *client, pm_message_t state)
469 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
471 aat2870_disable(aat2870);
476 static int aat2870_i2c_resume(struct i2c_client *client)
478 struct aat2870_data *aat2870 = i2c_get_clientdata(client);
479 struct aat2870_register *reg = NULL;
482 aat2870_enable(aat2870);
484 /* restore registers */
485 for (i = 0; i < AAT2870_REG_NUM; i++) {
486 reg = &aat2870->reg_cache[i];
488 aat2870->write(aat2870, i, reg->value);
494 #define aat2870_i2c_suspend NULL
495 #define aat2870_i2c_resume NULL
496 #endif /* CONFIG_PM */
498 static struct i2c_device_id aat2870_i2c_id_table[] = {
502 MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
504 static struct i2c_driver aat2870_i2c_driver = {
507 .owner = THIS_MODULE,
509 .probe = aat2870_i2c_probe,
510 .remove = aat2870_i2c_remove,
511 .suspend = aat2870_i2c_suspend,
512 .resume = aat2870_i2c_resume,
513 .id_table = aat2870_i2c_id_table,
516 static int __init aat2870_init(void)
518 return i2c_add_driver(&aat2870_i2c_driver);
520 subsys_initcall(aat2870_init);
522 static void __exit aat2870_exit(void)
524 i2c_del_driver(&aat2870_i2c_driver);
526 module_exit(aat2870_exit);
528 MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
529 MODULE_LICENSE("GPL");
530 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");