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/init.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/gpio.h>
18 #include <linux/workqueue.h>
19 #include <linux/irq.h>
20 #include <linux/regmap.h>
21 #include <linux/err.h>
22 #include <linux/mfd/core.h>
23 #include <linux/mfd/smsc.h>
24 #include <linux/of_platform.h>
25
26 static const struct regmap_config smsc_regmap_config = {
27 .reg_bits = 8,
28 .val_bits = 8,
29 .max_register = SMSC_VEN_ID_H,
30 .cache_type = REGCACHE_RBTREE,
31 };
32
smsc_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)33 static int smsc_i2c_probe(struct i2c_client *i2c,
34 const struct i2c_device_id *id)
35 {
36 struct smsc *smsc;
37 int devid, rev, venid_l, venid_h;
38 int ret;
39
40 smsc = devm_kzalloc(&i2c->dev, sizeof(*smsc), GFP_KERNEL);
41 if (!smsc)
42 return -ENOMEM;
43
44 smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
45 if (IS_ERR(smsc->regmap))
46 return PTR_ERR(smsc->regmap);
47
48 i2c_set_clientdata(i2c, smsc);
49 smsc->dev = &i2c->dev;
50
51 #ifdef CONFIG_OF
52 of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
53 #endif
54
55 regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
56 regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
57 regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
58 regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
59
60 dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
61 devid, rev, (venid_h << 8) | venid_l);
62
63 ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
64 if (ret)
65 return ret;
66
67 #ifdef CONFIG_OF
68 if (i2c->dev.of_node)
69 ret = devm_of_platform_populate(&i2c->dev);
70 #endif
71
72 return ret;
73 }
74
75 static const struct i2c_device_id smsc_i2c_id[] = {
76 { "smscece1099", 0},
77 {},
78 };
79
80 static struct i2c_driver smsc_i2c_driver = {
81 .driver = {
82 .name = "smsc",
83 },
84 .probe = smsc_i2c_probe,
85 .id_table = smsc_i2c_id,
86 };
87 builtin_i2c_driver(smsc_i2c_driver);
88
