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/slab.h>
17#include <linux/i2c.h>
18#include <linux/gpio.h>
19#include <linux/workqueue.h>
20#include <linux/irq.h>
21#include <linux/regmap.h>
22#include <linux/err.h>
23#include <linux/mfd/core.h>
24#include <linux/mfd/smsc.h>
25#include <linux/of_platform.h>
26
27static const struct regmap_config smsc_regmap_config = {
28		.reg_bits = 8,
29		.val_bits = 8,
30		.max_register = SMSC_VEN_ID_H,
31		.cache_type = REGCACHE_RBTREE,
32};
33
34static int smsc_i2c_probe(struct i2c_client *i2c,
35			const struct i2c_device_id *id)
36{
37	struct smsc *smsc;
38	int devid, rev, venid_l, venid_h;
39	int ret = 0;
40
41	smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
42				GFP_KERNEL);
43	if (!smsc) {
44		dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
45		return -ENOMEM;
46	}
47
48	smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
49	if (IS_ERR(smsc->regmap)) {
50		ret = PTR_ERR(smsc->regmap);
51		goto err;
52	}
53
54	i2c_set_clientdata(i2c, smsc);
55	smsc->dev = &i2c->dev;
56
57#ifdef CONFIG_OF
58	of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
59#endif
60
61	regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
62	regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
63	regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
64	regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
65
66	dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
67		devid, rev, (venid_h << 8) | venid_l);
68
69	ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
70	if (ret)
71		goto err;
72
73#ifdef CONFIG_OF
74	if (i2c->dev.of_node)
75		ret = of_platform_populate(i2c->dev.of_node,
76					   NULL, NULL, &i2c->dev);
77#endif
78
79err:
80	return ret;
81}
82
83static int smsc_i2c_remove(struct i2c_client *i2c)
84{
85	struct smsc *smsc = i2c_get_clientdata(i2c);
86
87	mfd_remove_devices(smsc->dev);
88
89	return 0;
90}
91
92static const struct i2c_device_id smsc_i2c_id[] = {
93	{ "smscece1099", 0},
94	{},
95};
96MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
97
98static struct i2c_driver smsc_i2c_driver = {
99	.driver = {
100		   .name = "smsc",
101	},
102	.probe = smsc_i2c_probe,
103	.remove = smsc_i2c_remove,
104	.id_table = smsc_i2c_id,
105};
106
107module_i2c_driver(smsc_i2c_driver);
108
109MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
110MODULE_DESCRIPTION("SMSC chip multi-function driver");
111MODULE_LICENSE("GPL v2");
112