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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 9923a8b45098fa4160cca113c10240973ecacf7e / . / drivers / power / regulator / fixed.c
blob: d053817fc22706b3abe0397adda56861ff34686f [file] [log] [blame]
Przemyslaw Marczak9923a8b2015-04-20 20:07:48 +0200[diff] [blame^]1/*
2 * Copyright (C) 2015 Samsung Electronics
3 *
4 * Przemyslaw Marczak <p.marczak@samsung.com>
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9#include <common.h>
10#include <fdtdec.h>
11#include <errno.h>
12#include <dm.h>
13#include <i2c.h>
14#include <asm/gpio.h>
15#include <power/pmic.h>
16#include <power/regulator.h>
17
18DECLARE_GLOBAL_DATA_PTR;
19
20struct fixed_regulator_platdata {
21 struct gpio_desc gpio; /* GPIO for regulator enable control */
22};
23
24static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
25{
26 struct dm_regulator_uclass_platdata *uc_pdata;
27 struct fixed_regulator_platdata *dev_pdata;
28 struct gpio_desc *gpio;
29 int ret;
30
31 dev_pdata = dev_get_platdata(dev);
32 uc_pdata = dev_get_uclass_platdata(dev);
33 if (!uc_pdata)
34 return -ENXIO;
35
36 /* Set type to fixed */
37 uc_pdata->type = REGULATOR_TYPE_FIXED;
38
39 /* Get fixed regulator gpio desc */
40 gpio = &dev_pdata->gpio;
41 ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
42 if (ret)
43 debug("Fixed regulator gpio - not found! Error: %d", ret);
44
45 return 0;
46}
47
48static int fixed_regulator_get_value(struct udevice *dev)
49{
50 struct dm_regulator_uclass_platdata *uc_pdata;
51
52 uc_pdata = dev_get_uclass_platdata(dev);
53 if (!uc_pdata)
54 return -ENXIO;
55
56 if (uc_pdata->min_uV != uc_pdata->max_uV) {
57 debug("Invalid constraints for: %s\n", uc_pdata->name);
58 return -EINVAL;
59 }
60
61 return uc_pdata->min_uV;
62}
63
64static int fixed_regulator_get_current(struct udevice *dev)
65{
66 struct dm_regulator_uclass_platdata *uc_pdata;
67
68 uc_pdata = dev_get_uclass_platdata(dev);
69 if (!uc_pdata)
70 return -ENXIO;
71
72 if (uc_pdata->min_uA != uc_pdata->max_uA) {
73 debug("Invalid constraints for: %s\n", uc_pdata->name);
74 return -EINVAL;
75 }
76
77 return uc_pdata->min_uA;
78}
79
80static bool fixed_regulator_get_enable(struct udevice *dev)
81{
82 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
83
84 if (!dev_pdata->gpio.dev)
85 return false;
86
87 return dm_gpio_get_value(&dev_pdata->gpio);
88}
89
90static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
91{
92 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
93 int ret;
94
95 if (!dev_pdata->gpio.dev)
96 return -ENOSYS;
97
98 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
99 if (ret) {
100 error("Can't set regulator : %s gpio to: %d\n", dev->name,
101 enable);
102 return ret;
103 }
104 return 0;
105}
106
107static const struct dm_regulator_ops fixed_regulator_ops = {
108 .get_value = fixed_regulator_get_value,
109 .get_current = fixed_regulator_get_current,
110 .get_enable = fixed_regulator_get_enable,
111 .set_enable = fixed_regulator_set_enable,
112};
113
114static const struct udevice_id fixed_regulator_ids[] = {
115 { .compatible = "regulator-fixed" },
116 { },
117};
118
119U_BOOT_DRIVER(fixed_regulator) = {
120 .name = "fixed regulator",
121 .id = UCLASS_REGULATOR,
122 .ops = &fixed_regulator_ops,
123 .of_match = fixed_regulator_ids,
124 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
125 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
126};