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
smsc_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)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
smsc_i2c_remove(struct i2c_client * i2c)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");
114