1 /*
2  * Regulator driver for tps65090 power management chip.
3  *
4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
5 
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9 
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14 
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>
17  */
18 
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24 #include <linux/regulator/driver.h>
25 #include <linux/regulator/machine.h>
26 #include <linux/mfd/tps65090.h>
27 #include <linux/regulator/tps65090-regulator.h>
28 
29 struct tps65090_regulator {
30 	int		id;
31 	/* used by regulator core */
32 	struct regulator_desc	desc;
33 
34 	/* Device */
35 	struct device		*dev;
36 };
37 
38 static struct regulator_ops tps65090_ops = {
39 	.enable = regulator_enable_regmap,
40 	.disable = regulator_disable_regmap,
41 	.is_enabled = regulator_is_enabled_regmap,
42 };
43 
44 #define tps65090_REG(_id)				\
45 {							\
46 	.id		= TPS65090_ID_##_id,		\
47 	.desc = {					\
48 		.name = tps65090_rails(_id),		\
49 		.id = TPS65090_ID_##_id,		\
50 		.ops = &tps65090_ops,			\
51 		.type = REGULATOR_VOLTAGE,		\
52 		.owner = THIS_MODULE,			\
53 		.enable_reg = (TPS65090_ID_##_id) + 12,	\
54 		.enable_mask = BIT(0),			\
55 	},						\
56 }
57 
58 static struct tps65090_regulator TPS65090_regulator[] = {
59 	tps65090_REG(DCDC1),
60 	tps65090_REG(DCDC2),
61 	tps65090_REG(DCDC3),
62 	tps65090_REG(FET1),
63 	tps65090_REG(FET2),
64 	tps65090_REG(FET3),
65 	tps65090_REG(FET4),
66 	tps65090_REG(FET5),
67 	tps65090_REG(FET6),
68 	tps65090_REG(FET7),
69 };
70 
71 static inline struct tps65090_regulator *find_regulator_info(int id)
72 {
73 	struct tps65090_regulator *ri;
74 	int i;
75 
76 	for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
77 		ri = &TPS65090_regulator[i];
78 		if (ri->desc.id == id)
79 			return ri;
80 	}
81 	return NULL;
82 }
83 
84 static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
85 {
86 	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
87 	struct tps65090_regulator *ri = NULL;
88 	struct regulator_config config = { };
89 	struct regulator_dev *rdev;
90 	struct tps65090_regulator_platform_data *tps_pdata;
91 	int id = pdev->id;
92 
93 	dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
94 
95 	ri = find_regulator_info(id);
96 	if (ri == NULL) {
97 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
98 		return -EINVAL;
99 	}
100 	tps_pdata = pdev->dev.platform_data;
101 	ri->dev = &pdev->dev;
102 
103 	config.dev = &pdev->dev;
104 	config.init_data = &tps_pdata->regulator;
105 	config.driver_data = ri;
106 	config.regmap = tps65090_mfd->rmap;
107 
108 	rdev = regulator_register(&ri->desc, &config);
109 	if (IS_ERR(rdev)) {
110 		dev_err(&pdev->dev, "failed to register regulator %s\n",
111 				ri->desc.name);
112 		return PTR_ERR(rdev);
113 	}
114 
115 	platform_set_drvdata(pdev, rdev);
116 	return 0;
117 }
118 
119 static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
120 {
121 	struct regulator_dev *rdev = platform_get_drvdata(pdev);
122 
123 	regulator_unregister(rdev);
124 	return 0;
125 }
126 
127 static struct platform_driver tps65090_regulator_driver = {
128 	.driver	= {
129 		.name	= "tps65090-regulator",
130 		.owner	= THIS_MODULE,
131 	},
132 	.probe		= tps65090_regulator_probe,
133 	.remove		= __devexit_p(tps65090_regulator_remove),
134 };
135 
136 static int __init tps65090_regulator_init(void)
137 {
138 	return platform_driver_register(&tps65090_regulator_driver);
139 }
140 subsys_initcall(tps65090_regulator_init);
141 
142 static void __exit tps65090_regulator_exit(void)
143 {
144 	platform_driver_unregister(&tps65090_regulator_driver);
145 }
146 module_exit(tps65090_regulator_exit);
147 
148 MODULE_DESCRIPTION("tps65090 regulator driver");
149 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
150 MODULE_LICENSE("GPL v2");
151