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/bq27x00_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
27static int F_ID;
28
29static 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
42static struct bq27000_platform_data bq27000_battery_info = {
43	.read   = w1_bq27000_read,
44	.name   = "bq27000-battery",
45};
46
47static int w1_bq27000_add_slave(struct w1_slave *sl)
48{
49	int ret;
50	struct platform_device *pdev;
51
52	pdev = platform_device_alloc("bq27000-battery", -1);
53	if (!pdev) {
54		ret = -ENOMEM;
55		return ret;
56	}
57	ret = platform_device_add_data(pdev,
58				       &bq27000_battery_info,
59				       sizeof(bq27000_battery_info));
60	if (ret)
61		goto pdev_add_failed;
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
72pdev_add_failed:
73	platform_device_put(pdev);
74success:
75	return ret;
76}
77
78static 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
85static struct w1_family_ops w1_bq27000_fops = {
86	.add_slave	= w1_bq27000_add_slave,
87	.remove_slave	= w1_bq27000_remove_slave,
88};
89
90static struct w1_family w1_bq27000_family = {
91	.fid = W1_FAMILY_BQ27000,
92	.fops = &w1_bq27000_fops,
93};
94
95static 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
103static void __exit w1_bq27000_exit(void)
104{
105	w1_unregister_family(&w1_bq27000_family);
106}
107
108
109module_init(w1_bq27000_init);
110module_exit(w1_bq27000_exit);
111
112module_param(F_ID, int, S_IRUSR);
113MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
114MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));
115MODULE_LICENSE("GPL");
116MODULE_AUTHOR("Texas Instruments Ltd");
117MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
118