tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
3 * 1-Cell Li-Ion Charger connected via GPIOs.
4 *
5 * Copyright (c) 2008 Philipp Zabel
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/err.h>
17#include <linux/gpio.h>
18#include <linux/regulator/bq24022.h>
19#include <linux/regulator/driver.h>
20
21
22static int bq24022_set_current_limit(struct regulator_dev *rdev,
23 int min_uA, int max_uA)
24{
25 struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
26
27 dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n",
28 max_uA >= 500000 ? "500" : "100");
29
30 /* REVISIT: maybe return error if min_uA != 0 ? */
31 gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
32 return 0;
33}
34
35static int bq24022_get_current_limit(struct regulator_dev *rdev)
36{
37 struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
38
39 return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
40}
41
42static int bq24022_enable(struct regulator_dev *rdev)
43{
44 struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
45
46 dev_dbg(rdev_get_dev(rdev), "enabling charger\n");
47
48 gpio_set_value(pdata->gpio_nce, 0);
49 return 0;
50}
51
52static int bq24022_disable(struct regulator_dev *rdev)
53{
54 struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
55
56 dev_dbg(rdev_get_dev(rdev), "disabling charger\n");
57
58 gpio_set_value(pdata->gpio_nce, 1);
59 return 0;
60}
61
62static int bq24022_is_enabled(struct regulator_dev *rdev)
63{
64 struct platform_device *pdev = rdev_get_drvdata(rdev);
65 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
66
67 return !gpio_get_value(pdata->gpio_nce);
68}
69
70static struct regulator_ops bq24022_ops = {
71 .set_current_limit = bq24022_set_current_limit,
72 .get_current_limit = bq24022_get_current_limit,
73 .enable = bq24022_enable,
74 .disable = bq24022_disable,
75 .is_enabled = bq24022_is_enabled,
76};
77
78static struct regulator_desc bq24022_desc = {
79 .name = "bq24022",
80 .ops = &bq24022_ops,
81 .type = REGULATOR_CURRENT,
82};
83
84static int __init bq24022_probe(struct platform_device *pdev)
85{
86 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
87 struct regulator_dev *bq24022;
88 int ret;
89
90 if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
91 return -EINVAL;
92
93 ret = gpio_request(pdata->gpio_nce, "ncharge_en");
94 if (ret) {
95 dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
96 pdata->gpio_nce);
97 goto err_ce;
98 }
99 ret = gpio_request(pdata->gpio_iset2, "charge_mode");
100 if (ret) {
101 dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
102 pdata->gpio_iset2);
103 goto err_iset2;
104 }
105 ret = gpio_direction_output(pdata->gpio_iset2, 0);
106 ret = gpio_direction_output(pdata->gpio_nce, 1);
107
108 bq24022 = regulator_register(&bq24022_desc, &pdev->dev, pdata);
109 if (IS_ERR(bq24022)) {
110 dev_dbg(&pdev->dev, "couldn't register regulator\n");
111 ret = PTR_ERR(bq24022);
112 goto err_reg;
113 }
114 platform_set_drvdata(pdev, bq24022);
115 dev_dbg(&pdev->dev, "registered regulator\n");
116
117 return 0;
118err_reg:
119 gpio_free(pdata->gpio_iset2);
120err_iset2:
121 gpio_free(pdata->gpio_nce);
122err_ce:
123 return ret;
124}
125
126static int __devexit bq24022_remove(struct platform_device *pdev)
127{
128 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
129 struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
130
131 regulator_unregister(bq24022);
132 gpio_free(pdata->gpio_iset2);
133 gpio_free(pdata->gpio_nce);
134
135 return 0;
136}
137
138static struct platform_driver bq24022_driver = {
139 .driver = {
140 .name = "bq24022",
141 },
142 .remove = __devexit_p(bq24022_remove),
143};
144
145static int __init bq24022_init(void)
146{
147 return platform_driver_probe(&bq24022_driver, bq24022_probe);
148}
149
150static void __exit bq24022_exit(void)
151{
152 platform_driver_unregister(&bq24022_driver);
153}
154
155/*
156 * make sure this is probed before gpio_vbus and pda_power,
157 * but after asic3 or other GPIO expander drivers.
158 */
159subsys_initcall(bq24022_init);
160module_exit(bq24022_exit);
161
162MODULE_AUTHOR("Philipp Zabel");
163MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
164MODULE_LICENSE("GPL");