Root/drivers/mfd/aat2870-core.c

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
35static 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
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    /* Truncate count; min() would cause a warning */
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, (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
325static 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
331static 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
348static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
349{
350    debugfs_remove_recursive(aat2870->dentry_root);
351}
352#else
353static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
354{
355}
356
357static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
358{
359}
360#endif /* CONFIG_DEBUG_FS */
361
362static 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
437out_disable:
438    aat2870_disable(aat2870);
439    if (aat2870->en_pin >= 0)
440        gpio_free(aat2870->en_pin);
441out_kfree:
442    kfree(aat2870);
443out:
444    return ret;
445}
446
447static 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
465static 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
475static 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
495static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
496             aat2870_i2c_resume);
497
498static const struct i2c_device_id aat2870_i2c_id_table[] = {
499    { "aat2870", 0 },
500    { }
501};
502MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
503
504static 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
515static int __init aat2870_init(void)
516{
517    return i2c_add_driver(&aat2870_i2c_driver);
518}
519subsys_initcall(aat2870_init);
520
521static void __exit aat2870_exit(void)
522{
523    i2c_del_driver(&aat2870_i2c_driver);
524}
525module_exit(aat2870_exit);
526
527MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
528MODULE_LICENSE("GPL");
529MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
530

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