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[profile/ivi/kernel-x86-ivi.git] / drivers / mfd / smsc-ece1099.c
1 /*
2  * TI SMSC MFD Driver
3  *
4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
5  *
6  * Author: Sourav Poddar <sourav.poddar@ti.com>
7  *
8  *  This program is free software; you can redistribute it and/or modify it
9  *  under  the terms of the GNU General  Public License as published by the
10  *  Free Software Foundation;  GPL v2.
11  *
12  */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/i2c.h>
19 #include <linux/gpio.h>
20 #include <linux/workqueue.h>
21 #include <linux/irq.h>
22 #include <linux/regmap.h>
23 #include <linux/err.h>
24 #include <linux/mfd/core.h>
25 #include <linux/mfd/smsc.h>
26 #include <linux/of_platform.h>
27
28 static struct regmap_config smsc_regmap_config = {
29                 .reg_bits = 8,
30                 .val_bits = 8,
31                 .max_register = SMSC_VEN_ID_H,
32                 .cache_type = REGCACHE_RBTREE,
33 };
34
35 static int smsc_i2c_probe(struct i2c_client *i2c,
36                         const struct i2c_device_id *id)
37 {
38         struct smsc *smsc;
39         int devid, rev, venid_l, venid_h;
40         int ret = 0;
41
42         smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
43                                 GFP_KERNEL);
44         if (!smsc) {
45                 dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
46                 return -ENOMEM;
47         }
48
49         smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
50         if (IS_ERR(smsc->regmap)) {
51                 ret = PTR_ERR(smsc->regmap);
52                 goto err;
53         }
54
55         i2c_set_clientdata(i2c, smsc);
56         smsc->dev = &i2c->dev;
57
58 #ifdef CONFIG_OF
59         of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
60 #endif
61
62         regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
63         regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
64         regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
65         regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
66
67         dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
68                 devid, rev, (venid_h << 8) | venid_l);
69
70         ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
71         if (ret)
72                 goto err;
73
74 #ifdef CONFIG_OF
75         if (i2c->dev.of_node)
76                 ret = of_platform_populate(i2c->dev.of_node,
77                                            NULL, NULL, &i2c->dev);
78 #endif
79
80 err:
81         return ret;
82 }
83
84 static int smsc_i2c_remove(struct i2c_client *i2c)
85 {
86         struct smsc *smsc = i2c_get_clientdata(i2c);
87
88         mfd_remove_devices(smsc->dev);
89
90         return 0;
91 }
92
93 static const struct i2c_device_id smsc_i2c_id[] = {
94         { "smscece1099", 0},
95         {},
96 };
97 MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
98
99 static struct i2c_driver smsc_i2c_driver = {
100         .driver = {
101                    .name = "smsc",
102                    .owner = THIS_MODULE,
103         },
104         .probe = smsc_i2c_probe,
105         .remove = smsc_i2c_remove,
106         .id_table = smsc_i2c_id,
107 };
108
109 module_i2c_driver(smsc_i2c_driver);
110
111 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
112 MODULE_DESCRIPTION("SMSC chip multi-function driver");
113 MODULE_LICENSE("GPL v2");