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 #include <linux/power/bq27xxx_battery.h>
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
w1_bq27000_read(struct device * dev,unsigned int reg)29 static int w1_bq27000_read(struct device *dev, unsigned int reg)
30 {
31 u8 val;
32 struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
33
34 mutex_lock(&sl->master->bus_mutex);
35 w1_write_8(sl->master, HDQ_CMD_READ | reg);
36 val = w1_read_8(sl->master);
37 mutex_unlock(&sl->master->bus_mutex);
38
39 return val;
40 }
41
42 static struct bq27xxx_platform_data bq27000_battery_info = {
43 .read = w1_bq27000_read,
44 .name = "bq27000-battery",
45 .chip = BQ27000,
46 };
47
w1_bq27000_add_slave(struct w1_slave * sl)48 static int w1_bq27000_add_slave(struct w1_slave *sl)
49 {
50 int ret;
51 struct platform_device *pdev;
52
53 pdev = platform_device_alloc("bq27000-battery", -1);
54 if (!pdev) {
55 ret = -ENOMEM;
56 return ret;
57 }
58 ret = platform_device_add_data(pdev,
59 &bq27000_battery_info,
60 sizeof(bq27000_battery_info));
61 if (ret)
62 goto pdev_add_failed;
63 pdev->dev.parent = &sl->dev;
64
65 ret = platform_device_add(pdev);
66 if (ret)
67 goto pdev_add_failed;
68
69 dev_set_drvdata(&sl->dev, pdev);
70
71 goto success;
72
73 pdev_add_failed:
74 platform_device_put(pdev);
75 success:
76 return ret;
77 }
78
w1_bq27000_remove_slave(struct w1_slave * sl)79 static void w1_bq27000_remove_slave(struct w1_slave *sl)
80 {
81 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
82
83 platform_device_unregister(pdev);
84 }
85
86 static struct w1_family_ops w1_bq27000_fops = {
87 .add_slave = w1_bq27000_add_slave,
88 .remove_slave = w1_bq27000_remove_slave,
89 };
90
91 static struct w1_family w1_bq27000_family = {
92 .fid = W1_FAMILY_BQ27000,
93 .fops = &w1_bq27000_fops,
94 };
95
w1_bq27000_init(void)96 static int __init w1_bq27000_init(void)
97 {
98 if (F_ID)
99 w1_bq27000_family.fid = F_ID;
100
101 return w1_register_family(&w1_bq27000_family);
102 }
103
w1_bq27000_exit(void)104 static void __exit w1_bq27000_exit(void)
105 {
106 w1_unregister_family(&w1_bq27000_family);
107 }
108
109
110 module_init(w1_bq27000_init);
111 module_exit(w1_bq27000_exit);
112
113 module_param(F_ID, int, S_IRUSR);
114 MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
115 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));
116 MODULE_LICENSE("GPL");
117 MODULE_AUTHOR("Texas Instruments Ltd");
118 MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
119