diff options
Diffstat (limited to 'drivers/regulator/bq24022.c')
-rw-r--r-- | drivers/regulator/bq24022.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/regulator/bq24022.c b/drivers/regulator/bq24022.c new file mode 100644 index 000000000000..263699d6152d --- /dev/null +++ b/drivers/regulator/bq24022.c | |||
@@ -0,0 +1,167 @@ | |||
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 | static 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 | |||
35 | static 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 | |||
43 | static 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 | |||
54 | static 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 | |||
65 | static 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 | |||
73 | static 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 | |||
81 | static struct regulator_desc bq24022_desc = { | ||
82 | .name = "bq24022", | ||
83 | .ops = &bq24022_ops, | ||
84 | .type = REGULATOR_CURRENT, | ||
85 | }; | ||
86 | |||
87 | static 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; | ||
121 | err_reg: | ||
122 | gpio_free(pdata->gpio_iset2); | ||
123 | err_iset2: | ||
124 | gpio_free(pdata->gpio_nce); | ||
125 | err_ce: | ||
126 | return ret; | ||
127 | } | ||
128 | |||
129 | static 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 | |||
141 | static struct platform_driver bq24022_driver = { | ||
142 | .driver = { | ||
143 | .name = "bq24022", | ||
144 | }, | ||
145 | .remove = __devexit_p(bq24022_remove), | ||
146 | }; | ||
147 | |||
148 | static int __init bq24022_init(void) | ||
149 | { | ||
150 | return platform_driver_probe(&bq24022_driver, bq24022_probe); | ||
151 | } | ||
152 | |||
153 | static 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 | */ | ||
162 | subsys_initcall(bq24022_init); | ||
163 | module_exit(bq24022_exit); | ||
164 | |||
165 | MODULE_AUTHOR("Philipp Zabel"); | ||
166 | MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver"); | ||
167 | MODULE_LICENSE("GPL"); | ||