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0eb5d5ab PZ |
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 | ||
a5766f11 | 21 | |
0eb5d5ab PZ |
22 | static int bq24022_set_current_limit(struct regulator_dev *rdev, |
23 | int min_uA, int max_uA) | |
24 | { | |
a5766f11 | 25 | struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev); |
0eb5d5ab | 26 | |
a5766f11 | 27 | dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n", |
0eb5d5ab PZ |
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 | { | |
a5766f11 | 37 | struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev); |
0eb5d5ab PZ |
38 | |
39 | return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000; | |
40 | } | |
41 | ||
42 | static int bq24022_enable(struct regulator_dev *rdev) | |
43 | { | |
a5766f11 | 44 | struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev); |
0eb5d5ab | 45 | |
a5766f11 | 46 | dev_dbg(rdev_get_dev(rdev), "enabling charger\n"); |
0eb5d5ab PZ |
47 | |
48 | gpio_set_value(pdata->gpio_nce, 0); | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static int bq24022_disable(struct regulator_dev *rdev) | |
53 | { | |
a5766f11 | 54 | struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev); |
0eb5d5ab | 55 | |
a5766f11 | 56 | dev_dbg(rdev_get_dev(rdev), "disabling charger\n"); |
0eb5d5ab PZ |
57 | |
58 | gpio_set_value(pdata->gpio_nce, 1); | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int bq24022_is_enabled(struct regulator_dev *rdev) | |
63 | { | |
030853b7 | 64 | struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev); |
0eb5d5ab PZ |
65 | |
66 | return !gpio_get_value(pdata->gpio_nce); | |
67 | } | |
68 | ||
69 | static struct regulator_ops bq24022_ops = { | |
70 | .set_current_limit = bq24022_set_current_limit, | |
71 | .get_current_limit = bq24022_get_current_limit, | |
72 | .enable = bq24022_enable, | |
73 | .disable = bq24022_disable, | |
74 | .is_enabled = bq24022_is_enabled, | |
75 | }; | |
76 | ||
77 | static struct regulator_desc bq24022_desc = { | |
78 | .name = "bq24022", | |
79 | .ops = &bq24022_ops, | |
80 | .type = REGULATOR_CURRENT, | |
64714354 | 81 | .owner = THIS_MODULE, |
0eb5d5ab PZ |
82 | }; |
83 | ||
84 | static 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 | ||
93c62da2 MB |
108 | bq24022 = regulator_register(&bq24022_desc, &pdev->dev, |
109 | pdata->init_data, pdata); | |
0eb5d5ab PZ |
110 | if (IS_ERR(bq24022)) { |
111 | dev_dbg(&pdev->dev, "couldn't register regulator\n"); | |
112 | ret = PTR_ERR(bq24022); | |
113 | goto err_reg; | |
114 | } | |
115 | platform_set_drvdata(pdev, bq24022); | |
116 | dev_dbg(&pdev->dev, "registered regulator\n"); | |
117 | ||
118 | return 0; | |
119 | err_reg: | |
120 | gpio_free(pdata->gpio_iset2); | |
121 | err_iset2: | |
122 | gpio_free(pdata->gpio_nce); | |
123 | err_ce: | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static int __devexit bq24022_remove(struct platform_device *pdev) | |
128 | { | |
129 | struct bq24022_mach_info *pdata = pdev->dev.platform_data; | |
130 | struct regulator_dev *bq24022 = platform_get_drvdata(pdev); | |
131 | ||
132 | regulator_unregister(bq24022); | |
133 | gpio_free(pdata->gpio_iset2); | |
134 | gpio_free(pdata->gpio_nce); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static struct platform_driver bq24022_driver = { | |
140 | .driver = { | |
141 | .name = "bq24022", | |
142 | }, | |
143 | .remove = __devexit_p(bq24022_remove), | |
144 | }; | |
145 | ||
146 | static int __init bq24022_init(void) | |
147 | { | |
148 | return platform_driver_probe(&bq24022_driver, bq24022_probe); | |
149 | } | |
150 | ||
151 | static void __exit bq24022_exit(void) | |
152 | { | |
153 | platform_driver_unregister(&bq24022_driver); | |
154 | } | |
155 | ||
9bf503e6 | 156 | module_init(bq24022_init); |
0eb5d5ab PZ |
157 | module_exit(bq24022_exit); |
158 | ||
159 | MODULE_AUTHOR("Philipp Zabel"); | |
160 | MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver"); | |
161 | MODULE_LICENSE("GPL"); |