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
26static 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
33static 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(struct smsc),
41				GFP_KERNEL);
42	if (!smsc) {
43		dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
44		return -ENOMEM;
45	}
46
47	smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
48	if (IS_ERR(smsc->regmap))
49		return PTR_ERR(smsc->regmap);
50
51	i2c_set_clientdata(i2c, smsc);
52	smsc->dev = &i2c->dev;
53
54#ifdef CONFIG_OF
55	of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
56#endif
57
58	regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
59	regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
60	regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
61	regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
62
63	dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
64		devid, rev, (venid_h << 8) | venid_l);
65
66	ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
67	if (ret)
68		return ret;
69
70#ifdef CONFIG_OF
71	if (i2c->dev.of_node)
72		ret = of_platform_populate(i2c->dev.of_node,
73					   NULL, NULL, &i2c->dev);
74#endif
75
76	return ret;
77}
78
79static const struct i2c_device_id smsc_i2c_id[] = {
80	{ "smscece1099", 0},
81	{},
82};
83
84static struct i2c_driver smsc_i2c_driver = {
85	.driver = {
86		   .name = "smsc",
87	},
88	.probe = smsc_i2c_probe,
89	.id_table = smsc_i2c_id,
90};
91builtin_i2c_driver(smsc_i2c_driver);