Commit | Line | Data |
---|---|---|
cfbc6190 MC |
1 | /* |
2 | * drivers/w1/slaves/w1_bq27000.c | |
3 | * | |
4 | * Copyright (C) 2007 Texas Instruments, Inc. | |
5 | * | |
6 | * This file is licensed under the terms of the GNU General Public License | |
7 | * version 2. This program is licensed "as is" without any warranty of any | |
8 | * kind, whether express or implied. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/mutex.h> | |
18 | ||
19 | #include "../w1.h" | |
20 | #include "../w1_int.h" | |
21 | #include "../w1_family.h" | |
22 | ||
23 | #define HDQ_CMD_READ (0) | |
24 | #define HDQ_CMD_WRITE (1<<7) | |
25 | ||
26 | static int F_ID; | |
27 | ||
28 | void w1_bq27000_write(struct device *dev, u8 buf, u8 reg) | |
29 | { | |
30 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
31 | ||
32 | if (!dev) { | |
33 | pr_info("Could not obtain slave dev ptr\n"); | |
34 | return; | |
35 | } | |
36 | ||
37 | w1_write_8(sl->master, HDQ_CMD_WRITE | reg); | |
38 | w1_write_8(sl->master, buf); | |
39 | } | |
40 | EXPORT_SYMBOL(w1_bq27000_write); | |
41 | ||
42 | int w1_bq27000_read(struct device *dev, u8 reg) | |
43 | { | |
44 | u8 val; | |
45 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); | |
46 | ||
47 | if (!dev) | |
48 | return 0; | |
49 | ||
50 | w1_write_8(sl->master, HDQ_CMD_READ | reg); | |
51 | val = w1_read_8(sl->master); | |
52 | ||
53 | return val; | |
54 | } | |
55 | EXPORT_SYMBOL(w1_bq27000_read); | |
56 | ||
57 | static int w1_bq27000_add_slave(struct w1_slave *sl) | |
58 | { | |
59 | int ret; | |
60 | int id = 1; | |
61 | struct platform_device *pdev; | |
62 | ||
63 | pdev = platform_device_alloc("bq27000-battery", id); | |
64 | if (!pdev) { | |
65 | ret = -ENOMEM; | |
66 | return ret; | |
67 | } | |
68 | pdev->dev.parent = &sl->dev; | |
69 | ||
70 | ret = platform_device_add(pdev); | |
71 | if (ret) | |
72 | goto pdev_add_failed; | |
73 | ||
74 | dev_set_drvdata(&sl->dev, pdev); | |
75 | ||
76 | goto success; | |
77 | ||
78 | pdev_add_failed: | |
79 | platform_device_unregister(pdev); | |
80 | success: | |
81 | return ret; | |
82 | } | |
83 | ||
84 | static void w1_bq27000_remove_slave(struct w1_slave *sl) | |
85 | { | |
86 | struct platform_device *pdev = dev_get_drvdata(&sl->dev); | |
87 | ||
88 | platform_device_unregister(pdev); | |
89 | } | |
90 | ||
91 | static struct w1_family_ops w1_bq27000_fops = { | |
92 | .add_slave = w1_bq27000_add_slave, | |
93 | .remove_slave = w1_bq27000_remove_slave, | |
94 | }; | |
95 | ||
96 | static struct w1_family w1_bq27000_family = { | |
97 | .fid = 1, | |
98 | .fops = &w1_bq27000_fops, | |
99 | }; | |
100 | ||
101 | static int __init w1_bq27000_init(void) | |
102 | { | |
103 | if (F_ID) | |
104 | w1_bq27000_family.fid = F_ID; | |
105 | ||
106 | return w1_register_family(&w1_bq27000_family); | |
107 | } | |
108 | ||
109 | static void __exit w1_bq27000_exit(void) | |
110 | { | |
111 | w1_unregister_family(&w1_bq27000_family); | |
112 | } | |
113 | ||
114 | ||
115 | module_init(w1_bq27000_init); | |
116 | module_exit(w1_bq27000_exit); | |
117 | ||
118 | module_param(F_ID, int, S_IRUSR); | |
119 | MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); | |
120 | ||
121 | MODULE_LICENSE("GPL"); | |
122 | MODULE_AUTHOR("Texas Instruments Ltd"); | |
123 | MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip"); |