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8284328c SP |
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> | |
8284328c SP |
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 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 | ||
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 | ||
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 | .owner = THIS_MODULE, | |
102 | }, | |
103 | .probe = smsc_i2c_probe, | |
104 | .remove = smsc_i2c_remove, | |
105 | .id_table = smsc_i2c_id, | |
106 | }; | |
107 | ||
108 | module_i2c_driver(smsc_i2c_driver); | |
109 | ||
110 | MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); | |
111 | MODULE_DESCRIPTION("SMSC chip multi-function driver"); | |
112 | MODULE_LICENSE("GPL v2"); |