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
21static int bq24022_set_current_limit(struct regulator_dev *rdev,
22 int min_uA, int max_uA)
23{
24 struct platform_device *pdev = rdev_get_drvdata(rdev);
25 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
26
27 dev_dbg(&pdev->dev, "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 platform_device *pdev = rdev_get_drvdata(rdev);
38 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
39
40 return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
41}
42
43static int bq24022_enable(struct regulator_dev *rdev)
44{
45 struct platform_device *pdev = rdev_get_drvdata(rdev);
46 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
47
48 dev_dbg(&pdev->dev, "enabling charger\n");
49
50 gpio_set_value(pdata->gpio_nce, 0);
51 return 0;
52}
53
54static int bq24022_disable(struct regulator_dev *rdev)
55{
56 struct platform_device *pdev = rdev_get_drvdata(rdev);
57 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
58
59 dev_dbg(&pdev->dev, "disabling charger\n");
60
61 gpio_set_value(pdata->gpio_nce, 1);
62 return 0;
63}
64
65static int bq24022_is_enabled(struct regulator_dev *rdev)
66{
67 struct platform_device *pdev = rdev_get_drvdata(rdev);
68 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
69
70 return !gpio_get_value(pdata->gpio_nce);
71}
72
73static struct regulator_ops bq24022_ops = {
74 .set_current_limit = bq24022_set_current_limit,
75 .get_current_limit = bq24022_get_current_limit,
76 .enable = bq24022_enable,
77 .disable = bq24022_disable,
78 .is_enabled = bq24022_is_enabled,
79};
80
81static struct regulator_desc bq24022_desc = {
82 .name = "bq24022",
83 .ops = &bq24022_ops,
84 .type = REGULATOR_CURRENT,
85};
86
87static int __init bq24022_probe(struct platform_device *pdev)
88{
89 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
90 struct regulator_dev *bq24022;
91 int ret;
92
93 if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
94 return -EINVAL;
95
96 ret = gpio_request(pdata->gpio_nce, "ncharge_en");
97 if (ret) {
98 dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
99 pdata->gpio_nce);
100 goto err_ce;
101 }
102 ret = gpio_request(pdata->gpio_iset2, "charge_mode");
103 if (ret) {
104 dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
105 pdata->gpio_iset2);
106 goto err_iset2;
107 }
108 ret = gpio_direction_output(pdata->gpio_iset2, 0);
109 ret = gpio_direction_output(pdata->gpio_nce, 1);
110
111 bq24022 = regulator_register(&bq24022_desc, pdev);
112 if (IS_ERR(bq24022)) {
113 dev_dbg(&pdev->dev, "couldn't register regulator\n");
114 ret = PTR_ERR(bq24022);
115 goto err_reg;
116 }
117 platform_set_drvdata(pdev, bq24022);
118 dev_dbg(&pdev->dev, "registered regulator\n");
119
120 return 0;
121err_reg:
122 gpio_free(pdata->gpio_iset2);
123err_iset2:
124 gpio_free(pdata->gpio_nce);
125err_ce:
126 return ret;
127}
128
129static int __devexit bq24022_remove(struct platform_device *pdev)
130{
131 struct bq24022_mach_info *pdata = pdev->dev.platform_data;
132 struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
133
134 regulator_unregister(bq24022);
135 gpio_free(pdata->gpio_iset2);
136 gpio_free(pdata->gpio_nce);
137
138 return 0;
139}
140
141static struct platform_driver bq24022_driver = {
142 .driver = {
143 .name = "bq24022",
144 },
145 .remove = __devexit_p(bq24022_remove),
146};
147
148static int __init bq24022_init(void)
149{
150 return platform_driver_probe(&bq24022_driver, bq24022_probe);
151}
152
153static void __exit bq24022_exit(void)
154{
155 platform_driver_unregister(&bq24022_driver);
156}
157
158/*
159 * make sure this is probed before gpio_vbus and pda_power,
160 * but after asic3 or other GPIO expander drivers.
161 */
162subsys_initcall(bq24022_init);
163module_exit(bq24022_exit);
164
165MODULE_AUTHOR("Philipp Zabel");
166MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
167MODULE_LICENSE("GPL");