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452534e5 VB |
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/delay.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/regulator/driver.h> | |
26 | #include <linux/regulator/machine.h> | |
27 | #include <linux/mfd/tps65090.h> | |
28 | #include <linux/regulator/tps65090-regulator.h> | |
29 | ||
30 | struct tps65090_regulator { | |
31 | int id; | |
32 | /* Regulator register address.*/ | |
33 | u8 reg_en_reg; | |
34 | u8 en_bit; | |
35 | ||
36 | /* used by regulator core */ | |
37 | struct regulator_desc desc; | |
38 | ||
39 | /* Device */ | |
40 | struct device *dev; | |
41 | }; | |
42 | ||
43 | static inline struct device *to_tps65090_dev(struct regulator_dev *rdev) | |
44 | { | |
45 | return rdev_get_dev(rdev)->parent->parent; | |
46 | } | |
47 | ||
48 | static int tps65090_reg_is_enabled(struct regulator_dev *rdev) | |
49 | { | |
50 | struct tps65090_regulator *ri = rdev_get_drvdata(rdev); | |
51 | struct device *parent = to_tps65090_dev(rdev); | |
52 | uint8_t control; | |
53 | int ret; | |
54 | ||
55 | ret = tps65090_read(parent, ri->reg_en_reg, &control); | |
56 | if (ret < 0) { | |
57 | dev_err(&rdev->dev, "Error in reading reg 0x%x\n", | |
58 | ri->reg_en_reg); | |
59 | return ret; | |
60 | } | |
61 | return (((control >> ri->en_bit) & 1) == 1); | |
62 | } | |
63 | ||
64 | static int tps65090_reg_enable(struct regulator_dev *rdev) | |
65 | { | |
66 | struct tps65090_regulator *ri = rdev_get_drvdata(rdev); | |
67 | struct device *parent = to_tps65090_dev(rdev); | |
68 | int ret; | |
69 | ||
70 | ret = tps65090_set_bits(parent, ri->reg_en_reg, ri->en_bit); | |
71 | if (ret < 0) | |
72 | dev_err(&rdev->dev, "Error in updating reg 0x%x\n", | |
73 | ri->reg_en_reg); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | static int tps65090_reg_disable(struct regulator_dev *rdev) | |
78 | { | |
79 | struct tps65090_regulator *ri = rdev_get_drvdata(rdev); | |
80 | struct device *parent = to_tps65090_dev(rdev); | |
81 | int ret; | |
82 | ||
83 | ret = tps65090_clr_bits(parent, ri->reg_en_reg, ri->en_bit); | |
84 | if (ret < 0) | |
85 | dev_err(&rdev->dev, "Error in updating reg 0x%x\n", | |
86 | ri->reg_en_reg); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static struct regulator_ops tps65090_ops = { | |
92 | .enable = tps65090_reg_enable, | |
93 | .disable = tps65090_reg_disable, | |
94 | .is_enabled = tps65090_reg_is_enabled, | |
95 | }; | |
96 | ||
4b3bd55f | 97 | #define tps65090_REG(_id) \ |
452534e5 | 98 | { \ |
4b3bd55f AL |
99 | .reg_en_reg = (TPS65090_ID_##_id) + 12, \ |
100 | .en_bit = 0, \ | |
452534e5 VB |
101 | .id = TPS65090_ID_##_id, \ |
102 | .desc = { \ | |
103 | .name = tps65090_rails(_id), \ | |
104 | .id = TPS65090_ID_##_id, \ | |
4b3bd55f | 105 | .ops = &tps65090_ops, \ |
452534e5 VB |
106 | .type = REGULATOR_VOLTAGE, \ |
107 | .owner = THIS_MODULE, \ | |
108 | }, \ | |
109 | } | |
110 | ||
111 | static struct tps65090_regulator TPS65090_regulator[] = { | |
4b3bd55f AL |
112 | tps65090_REG(DCDC1), |
113 | tps65090_REG(DCDC2), | |
114 | tps65090_REG(DCDC3), | |
115 | tps65090_REG(FET1), | |
116 | tps65090_REG(FET2), | |
117 | tps65090_REG(FET3), | |
118 | tps65090_REG(FET4), | |
119 | tps65090_REG(FET5), | |
120 | tps65090_REG(FET6), | |
121 | tps65090_REG(FET7), | |
452534e5 VB |
122 | }; |
123 | ||
124 | static inline struct tps65090_regulator *find_regulator_info(int id) | |
125 | { | |
126 | struct tps65090_regulator *ri; | |
127 | int i; | |
128 | ||
129 | for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) { | |
130 | ri = &TPS65090_regulator[i]; | |
131 | if (ri->desc.id == id) | |
132 | return ri; | |
133 | } | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | static int __devinit tps65090_regulator_probe(struct platform_device *pdev) | |
138 | { | |
139 | struct tps65090_regulator *ri = NULL; | |
c172708d | 140 | struct regulator_config config = { }; |
452534e5 VB |
141 | struct regulator_dev *rdev; |
142 | struct tps65090_regulator_platform_data *tps_pdata; | |
143 | int id = pdev->id; | |
144 | ||
145 | dev_dbg(&pdev->dev, "Probing regulator %d\n", id); | |
146 | ||
147 | ri = find_regulator_info(id); | |
148 | if (ri == NULL) { | |
149 | dev_err(&pdev->dev, "invalid regulator ID specified\n"); | |
150 | return -EINVAL; | |
151 | } | |
152 | tps_pdata = pdev->dev.platform_data; | |
153 | ri->dev = &pdev->dev; | |
154 | ||
c172708d MB |
155 | config.dev = &pdev->dev; |
156 | config.init_data = &tps_pdata->regulator; | |
157 | config.driver_data = ri; | |
158 | ||
159 | rdev = regulator_register(&ri->desc, &config); | |
0ca2d6e6 | 160 | if (IS_ERR(rdev)) { |
452534e5 VB |
161 | dev_err(&pdev->dev, "failed to register regulator %s\n", |
162 | ri->desc.name); | |
163 | return PTR_ERR(rdev); | |
164 | } | |
165 | ||
166 | platform_set_drvdata(pdev, rdev); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int __devexit tps65090_regulator_remove(struct platform_device *pdev) | |
171 | { | |
172 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
173 | ||
174 | regulator_unregister(rdev); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct platform_driver tps65090_regulator_driver = { | |
179 | .driver = { | |
180 | .name = "tps65090-regulator", | |
181 | .owner = THIS_MODULE, | |
182 | }, | |
183 | .probe = tps65090_regulator_probe, | |
184 | .remove = __devexit_p(tps65090_regulator_remove), | |
185 | }; | |
186 | ||
187 | static int __init tps65090_regulator_init(void) | |
188 | { | |
189 | return platform_driver_register(&tps65090_regulator_driver); | |
190 | } | |
191 | subsys_initcall(tps65090_regulator_init); | |
192 | ||
193 | static void __exit tps65090_regulator_exit(void) | |
194 | { | |
195 | platform_driver_unregister(&tps65090_regulator_driver); | |
196 | } | |
197 | module_exit(tps65090_regulator_exit); | |
198 | ||
199 | MODULE_DESCRIPTION("tps65090 regulator driver"); | |
200 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
201 | MODULE_LICENSE("GPL v2"); |