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>
20 #include "../w1_int.h"
21 #include "../w1_family.h"
23 #define HDQ_CMD_READ (0)
24 #define HDQ_CMD_WRITE (1<<7)
28 void w1_bq27000_write(struct device *dev, u8 buf, u8 reg)
30 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
33 pr_info("Could not obtain slave dev ptr\n");
37 w1_write_8(sl->master, HDQ_CMD_WRITE | reg);
38 w1_write_8(sl->master, buf);
40 EXPORT_SYMBOL(w1_bq27000_write);
42 int w1_bq27000_read(struct device *dev, u8 reg)
45 struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
50 w1_write_8(sl->master, HDQ_CMD_READ | reg);
51 val = w1_read_8(sl->master);
55 EXPORT_SYMBOL(w1_bq27000_read);
57 static int w1_bq27000_add_slave(struct w1_slave *sl)
61 struct platform_device *pdev;
63 pdev = platform_device_alloc("bq27000-battery", id);
68 pdev->dev.parent = &sl->dev;
70 ret = platform_device_add(pdev);
74 dev_set_drvdata(&sl->dev, pdev);
79 platform_device_unregister(pdev);
84 static void w1_bq27000_remove_slave(struct w1_slave *sl)
86 struct platform_device *pdev = dev_get_drvdata(&sl->dev);
88 platform_device_unregister(pdev);
91 static struct w1_family_ops w1_bq27000_fops = {
92 .add_slave = w1_bq27000_add_slave,
93 .remove_slave = w1_bq27000_remove_slave,
96 static struct w1_family w1_bq27000_family = {
98 .fops = &w1_bq27000_fops,
101 static int __init w1_bq27000_init(void)
104 w1_bq27000_family.fid = F_ID;
106 return w1_register_family(&w1_bq27000_family);
109 static void __exit w1_bq27000_exit(void)
111 w1_unregister_family(&w1_bq27000_family);
115 module_init(w1_bq27000_init);
116 module_exit(w1_bq27000_exit);
118 module_param(F_ID, int, S_IRUSR);
119 MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
121 MODULE_LICENSE("GPL");
122 MODULE_AUTHOR("Texas Instruments Ltd");
123 MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");