1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sky81452.c SKY81452 MFD driver
4 *
5 * Copyright 2014 Skyworks Solutions Inc.
6 * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/slab.h>
14 #include <linux/i2c.h>
15 #include <linux/regmap.h>
16 #include <linux/mfd/core.h>
17 #include <linux/mfd/sky81452.h>
18
19 static const struct regmap_config sky81452_config = {
20 .reg_bits = 8,
21 .val_bits = 8,
22 };
23
sky81452_probe(struct i2c_client * client)24 static int sky81452_probe(struct i2c_client *client)
25 {
26 struct device *dev = &client->dev;
27 const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
28 struct mfd_cell cells[2];
29 struct regmap *regmap;
30 int ret;
31
32 if (!pdata) {
33 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
34 if (!pdata)
35 return -ENOMEM;
36 }
37
38 regmap = devm_regmap_init_i2c(client, &sky81452_config);
39 if (IS_ERR(regmap)) {
40 dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
41 return PTR_ERR(regmap);
42 }
43
44 i2c_set_clientdata(client, regmap);
45
46 memset(cells, 0, sizeof(cells));
47 cells[0].name = "sky81452-backlight";
48 cells[0].of_compatible = "skyworks,sky81452-backlight";
49 cells[1].name = "sky81452-regulator";
50 cells[1].platform_data = pdata->regulator_init_data;
51 cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
52
53 ret = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
54 NULL, 0, NULL);
55 if (ret)
56 dev_err(dev, "failed to add child devices. err=%d\n", ret);
57
58 return ret;
59 }
60
61 static const struct i2c_device_id sky81452_ids[] = {
62 { "sky81452" },
63 { }
64 };
65 MODULE_DEVICE_TABLE(i2c, sky81452_ids);
66
67 #ifdef CONFIG_OF
68 static const struct of_device_id sky81452_of_match[] = {
69 { .compatible = "skyworks,sky81452", },
70 { }
71 };
72 MODULE_DEVICE_TABLE(of, sky81452_of_match);
73 #endif
74
75 static struct i2c_driver sky81452_driver = {
76 .driver = {
77 .name = "sky81452",
78 .of_match_table = of_match_ptr(sky81452_of_match),
79 },
80 .probe = sky81452_probe,
81 .id_table = sky81452_ids,
82 };
83
84 module_i2c_driver(sky81452_driver);
85
86 MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
87 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
88 MODULE_LICENSE("GPL v2");
89