xref: /openbmc/linux/drivers/mfd/sky81452.c (revision 9816d859)
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