2 * drivers/w1/slaves/w1_bq27000.c
4 * Copyright (C) 2007 Texas Instruments, Inc.
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.
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>
22 #define W1_FAMILY_BQ27000 0x01
24 #define HDQ_CMD_READ (0)
25 #define HDQ_CMD_WRITE (1<<7)
28 module_param(F_ID, int, S_IRUSR);
29 MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
31 static int w1_bq27000_read(struct device *dev, unsigned int reg)
34 struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
36 mutex_lock(&sl->master->bus_mutex);
37 w1_write_8(sl->master, HDQ_CMD_READ | reg);
38 val = w1_read_8(sl->master);
39 mutex_unlock(&sl->master->bus_mutex);
44 static struct bq27xxx_platform_data bq27000_battery_info = {
45 .read = w1_bq27000_read,
46 .name = "bq27000-battery",
50 static int w1_bq27000_add_slave(struct w1_slave *sl)
53 struct platform_device *pdev;
55 pdev = platform_device_alloc("bq27000-battery", -1);
60 ret = platform_device_add_data(pdev,
61 &bq27000_battery_info,
62 sizeof(bq27000_battery_info));
65 pdev->dev.parent = &sl->dev;
67 ret = platform_device_add(pdev);
71 dev_set_drvdata(&sl->dev, pdev);
76 platform_device_put(pdev);
81 static void w1_bq27000_remove_slave(struct w1_slave *sl)
83 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
85 platform_device_unregister(pdev);
88 static struct w1_family_ops w1_bq27000_fops = {
89 .add_slave = w1_bq27000_add_slave,
90 .remove_slave = w1_bq27000_remove_slave,
93 static struct w1_family w1_bq27000_family = {
94 .fid = W1_FAMILY_BQ27000,
95 .fops = &w1_bq27000_fops,
98 static int __init w1_bq27000_init(void)
101 w1_bq27000_family.fid = F_ID;
103 return w1_register_family(&w1_bq27000_family);
106 static void __exit w1_bq27000_exit(void)
108 w1_unregister_family(&w1_bq27000_family);
111 module_init(w1_bq27000_init);
112 module_exit(w1_bq27000_exit);
114 MODULE_AUTHOR("Texas Instruments Ltd");
115 MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
116 MODULE_LICENSE("GPL");
117 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));