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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> | |
9f3519d2 | 18 | #include <linux/power/bq27x00_battery.h> |
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19 | |
20 | #include "../w1.h" | |
21 | #include "../w1_int.h" | |
22 | #include "../w1_family.h" | |
23 | ||
24 | #define HDQ_CMD_READ (0) | |
25 | #define HDQ_CMD_WRITE (1<<7) | |
26 | ||
27 | static int F_ID; | |
28 | ||
9f3519d2 | 29 | static int w1_bq27000_read(struct device *dev, unsigned int reg) |
cfbc6190 MC |
30 | { |
31 | u8 val; | |
9f3519d2 | 32 | struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev); |
cfbc6190 | 33 | |
b02f8bed | 34 | mutex_lock(&sl->master->bus_mutex); |
cfbc6190 MC |
35 | w1_write_8(sl->master, HDQ_CMD_READ | reg); |
36 | val = w1_read_8(sl->master); | |
b02f8bed | 37 | mutex_unlock(&sl->master->bus_mutex); |
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38 | |
39 | return val; | |
40 | } | |
9f3519d2 N |
41 | |
42 | static struct bq27000_platform_data bq27000_battery_info = { | |
43 | .read = w1_bq27000_read, | |
44 | .name = "bq27000-battery", | |
45 | }; | |
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46 | |
47 | static int w1_bq27000_add_slave(struct w1_slave *sl) | |
48 | { | |
49 | int ret; | |
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50 | struct platform_device *pdev; |
51 | ||
9f3519d2 | 52 | pdev = platform_device_alloc("bq27000-battery", -1); |
cfbc6190 MC |
53 | if (!pdev) { |
54 | ret = -ENOMEM; | |
55 | return ret; | |
56 | } | |
9f3519d2 N |
57 | ret = platform_device_add_data(pdev, |
58 | &bq27000_battery_info, | |
59 | sizeof(bq27000_battery_info)); | |
0ece1bbf WY |
60 | if (ret) |
61 | goto pdev_add_failed; | |
cfbc6190 MC |
62 | pdev->dev.parent = &sl->dev; |
63 | ||
64 | ret = platform_device_add(pdev); | |
65 | if (ret) | |
66 | goto pdev_add_failed; | |
67 | ||
68 | dev_set_drvdata(&sl->dev, pdev); | |
69 | ||
70 | goto success; | |
71 | ||
72 | pdev_add_failed: | |
0ece1bbf | 73 | platform_device_put(pdev); |
cfbc6190 MC |
74 | success: |
75 | return ret; | |
76 | } | |
77 | ||
78 | static void w1_bq27000_remove_slave(struct w1_slave *sl) | |
79 | { | |
80 | struct platform_device *pdev = dev_get_drvdata(&sl->dev); | |
81 | ||
82 | platform_device_unregister(pdev); | |
83 | } | |
84 | ||
85 | static struct w1_family_ops w1_bq27000_fops = { | |
86 | .add_slave = w1_bq27000_add_slave, | |
87 | .remove_slave = w1_bq27000_remove_slave, | |
88 | }; | |
89 | ||
90 | static struct w1_family w1_bq27000_family = { | |
4b7e4f82 | 91 | .fid = W1_FAMILY_BQ27000, |
cfbc6190 MC |
92 | .fops = &w1_bq27000_fops, |
93 | }; | |
94 | ||
95 | static int __init w1_bq27000_init(void) | |
96 | { | |
97 | if (F_ID) | |
98 | w1_bq27000_family.fid = F_ID; | |
99 | ||
100 | return w1_register_family(&w1_bq27000_family); | |
101 | } | |
102 | ||
103 | static void __exit w1_bq27000_exit(void) | |
104 | { | |
105 | w1_unregister_family(&w1_bq27000_family); | |
106 | } | |
107 | ||
108 | ||
109 | module_init(w1_bq27000_init); | |
110 | module_exit(w1_bq27000_exit); | |
111 | ||
112 | module_param(F_ID, int, S_IRUSR); | |
113 | MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device"); | |
4b7e4f82 | 114 | MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000)); |
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115 | MODULE_LICENSE("GPL"); |
116 | MODULE_AUTHOR("Texas Instruments Ltd"); | |
117 | MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip"); |