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
27 static 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
smsc_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)34 static 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
79 err:
80 return ret;
81 }
82
smsc_i2c_remove(struct i2c_client * i2c)83 static 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
92 static const struct i2c_device_id smsc_i2c_id[] = {
93 { "smscece1099", 0},
94 {},
95 };
96 MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
97
98 static 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
107 module_i2c_driver(smsc_i2c_driver);
108
109 MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
110 MODULE_DESCRIPTION("SMSC chip multi-function driver");
111 MODULE_LICENSE("GPL v2");
112