xref: /linux/drivers/mfd/mc13xxx-i2c.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
1 /*
2  * Copyright 2009-2010 Creative Product Design
3  * Marc Reilly marc@cpdesign.com.au
4  *
5  * This program is free software; you can redistribute it and/or modify it under
6  * the terms of the GNU General Public License version 2 as published by the
7  * Free Software Foundation.
8  */
9 
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/mutex.h>
14 #include <linux/mfd/core.h>
15 #include <linux/mfd/mc13xxx.h>
16 #include <linux/of.h>
17 #include <linux/of_device.h>
18 #include <linux/of_gpio.h>
19 #include <linux/i2c.h>
20 #include <linux/err.h>
21 
22 #include "mc13xxx.h"
23 
24 static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
25 	{
26 		.name = "mc13892",
27 		.driver_data = MC13XXX_ID_MC13892,
28 	}, {
29 		/* sentinel */
30 	}
31 };
32 MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
33 
34 static const struct of_device_id mc13xxx_dt_ids[] = {
35 	{
36 		.compatible = "fsl,mc13892",
37 		.data = (void *) &mc13xxx_i2c_device_id[0],
38 	}, {
39 		/* sentinel */
40 	}
41 };
42 MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
43 
44 static struct regmap_config mc13xxx_regmap_i2c_config = {
45 	.reg_bits = 8,
46 	.val_bits = 24,
47 
48 	.max_register = MC13XXX_NUMREGS,
49 
50 	.cache_type = REGCACHE_NONE,
51 };
52 
53 static int mc13xxx_i2c_probe(struct i2c_client *client,
54 		const struct i2c_device_id *id)
55 {
56 	const struct of_device_id *of_id;
57 	struct i2c_driver *idrv = to_i2c_driver(client->dev.driver);
58 	struct mc13xxx *mc13xxx;
59 	struct mc13xxx_platform_data *pdata = dev_get_platdata(&client->dev);
60 	int ret;
61 
62 	of_id = of_match_device(mc13xxx_dt_ids, &client->dev);
63 	if (of_id)
64 		idrv->id_table = (const struct i2c_device_id*) of_id->data;
65 
66 	mc13xxx = kzalloc(sizeof(*mc13xxx), GFP_KERNEL);
67 	if (!mc13xxx)
68 		return -ENOMEM;
69 
70 	dev_set_drvdata(&client->dev, mc13xxx);
71 
72 	mc13xxx->dev = &client->dev;
73 	mutex_init(&mc13xxx->lock);
74 
75 	mc13xxx->regmap = regmap_init_i2c(client, &mc13xxx_regmap_i2c_config);
76 	if (IS_ERR(mc13xxx->regmap)) {
77 		ret = PTR_ERR(mc13xxx->regmap);
78 		dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
79 				ret);
80 		dev_set_drvdata(&client->dev, NULL);
81 		kfree(mc13xxx);
82 		return ret;
83 	}
84 
85 	ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
86 
87 	if (ret == 0 && (id->driver_data != mc13xxx->ictype))
88 		dev_warn(mc13xxx->dev,
89 				"device id doesn't match auto detection!\n");
90 
91 	return ret;
92 }
93 
94 static int __devexit mc13xxx_i2c_remove(struct i2c_client *client)
95 {
96 	struct mc13xxx *mc13xxx = dev_get_drvdata(&client->dev);
97 
98 	mc13xxx_common_cleanup(mc13xxx);
99 
100 	return 0;
101 }
102 
103 static struct i2c_driver mc13xxx_i2c_driver = {
104 	.id_table = mc13xxx_i2c_device_id,
105 	.driver = {
106 		.owner = THIS_MODULE,
107 		.name = "mc13xxx",
108 		.of_match_table = mc13xxx_dt_ids,
109 	},
110 	.probe = mc13xxx_i2c_probe,
111 	.remove = __devexit_p(mc13xxx_i2c_remove),
112 };
113 
114 static int __init mc13xxx_i2c_init(void)
115 {
116 	return i2c_add_driver(&mc13xxx_i2c_driver);
117 }
118 subsys_initcall(mc13xxx_i2c_init);
119 
120 static void __exit mc13xxx_i2c_exit(void)
121 {
122 	i2c_del_driver(&mc13xxx_i2c_driver);
123 }
124 module_exit(mc13xxx_i2c_exit);
125 
126 MODULE_DESCRIPTION("i2c driver for Freescale MC13XXX PMIC");
127 MODULE_AUTHOR("Marc Reilly <marc@cpdesign.com.au");
128 MODULE_LICENSE("GPL v2");
129