tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3 */
4
5/*
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#include <linux/slab.h>
22#include <linux/device.h>
23#include <linux/module.h>
24#include <linux/err.h>
25#include <linux/io.h>
26#include <linux/platform_device.h>
27#include <linux/of.h>
28#include <linux/of_address.h>
29#include <linux/mfd/anatop.h>
30#include <linux/regulator/driver.h>
31#include <linux/regulator/of_regulator.h>
32
33struct anatop_regulator {
34 const char *name;
35 u32 control_reg;
36 struct anatop *mfd;
37 int vol_bit_shift;
38 int vol_bit_width;
39 int min_bit_val;
40 int min_voltage;
41 int max_voltage;
42 struct regulator_desc rdesc;
43 struct regulator_init_data *initdata;
44};
45
46static int anatop_set_voltage_sel(struct regulator_dev *reg, unsigned selector)
47{
48 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
49 u32 val, mask;
50
51 if (!anatop_reg->control_reg)
52 return -ENOTSUPP;
53
54 val = anatop_reg->min_bit_val + selector;
55 dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val);
56 mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
57 anatop_reg->vol_bit_shift;
58 val <<= anatop_reg->vol_bit_shift;
59 anatop_write_reg(anatop_reg->mfd, anatop_reg->control_reg, val, mask);
60
61 return 0;
62}
63
64static int anatop_get_voltage_sel(struct regulator_dev *reg)
65{
66 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
67 u32 val;
68
69 if (!anatop_reg->control_reg)
70 return -ENOTSUPP;
71
72 val = anatop_read_reg(anatop_reg->mfd, anatop_reg->control_reg);
73 val = (val & ((1 << anatop_reg->vol_bit_width) - 1)) >>
74 anatop_reg->vol_bit_shift;
75
76 return val - anatop_reg->min_bit_val;
77}
78
79static struct regulator_ops anatop_rops = {
80 .set_voltage_sel = anatop_set_voltage_sel,
81 .get_voltage_sel = anatop_get_voltage_sel,
82 .list_voltage = regulator_list_voltage_linear,
83 .map_voltage = regulator_map_voltage_linear,
84};
85
86static int __devinit anatop_regulator_probe(struct platform_device *pdev)
87{
88 struct device *dev = &pdev->dev;
89 struct device_node *np = dev->of_node;
90 struct regulator_desc *rdesc;
91 struct regulator_dev *rdev;
92 struct anatop_regulator *sreg;
93 struct regulator_init_data *initdata;
94 struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
95 struct regulator_config config = { };
96 int ret = 0;
97
98 initdata = of_get_regulator_init_data(dev, np);
99 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
100 if (!sreg)
101 return -ENOMEM;
102 sreg->initdata = initdata;
103 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
104 GFP_KERNEL);
105 rdesc = &sreg->rdesc;
106 memset(rdesc, 0, sizeof(*rdesc));
107 rdesc->name = sreg->name;
108 rdesc->ops = &anatop_rops;
109 rdesc->type = REGULATOR_VOLTAGE;
110 rdesc->owner = THIS_MODULE;
111 sreg->mfd = anatopmfd;
112 ret = of_property_read_u32(np, "anatop-reg-offset",
113 &sreg->control_reg);
114 if (ret) {
115 dev_err(dev, "no anatop-reg-offset property set\n");
116 goto anatop_probe_end;
117 }
118 ret = of_property_read_u32(np, "anatop-vol-bit-width",
119 &sreg->vol_bit_width);
120 if (ret) {
121 dev_err(dev, "no anatop-vol-bit-width property set\n");
122 goto anatop_probe_end;
123 }
124 ret = of_property_read_u32(np, "anatop-vol-bit-shift",
125 &sreg->vol_bit_shift);
126 if (ret) {
127 dev_err(dev, "no anatop-vol-bit-shift property set\n");
128 goto anatop_probe_end;
129 }
130 ret = of_property_read_u32(np, "anatop-min-bit-val",
131 &sreg->min_bit_val);
132 if (ret) {
133 dev_err(dev, "no anatop-min-bit-val property set\n");
134 goto anatop_probe_end;
135 }
136 ret = of_property_read_u32(np, "anatop-min-voltage",
137 &sreg->min_voltage);
138 if (ret) {
139 dev_err(dev, "no anatop-min-voltage property set\n");
140 goto anatop_probe_end;
141 }
142 ret = of_property_read_u32(np, "anatop-max-voltage",
143 &sreg->max_voltage);
144 if (ret) {
145 dev_err(dev, "no anatop-max-voltage property set\n");
146 goto anatop_probe_end;
147 }
148
149 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
150 / 25000 + 1;
151 rdesc->min_uV = sreg->min_voltage;
152 rdesc->uV_step = 25000;
153
154 config.dev = &pdev->dev;
155 config.init_data = initdata;
156 config.driver_data = sreg;
157 config.of_node = pdev->dev.of_node;
158
159 /* register regulator */
160 rdev = regulator_register(rdesc, &config);
161 if (IS_ERR(rdev)) {
162 dev_err(dev, "failed to register %s\n",
163 rdesc->name);
164 ret = PTR_ERR(rdev);
165 goto anatop_probe_end;
166 }
167
168 platform_set_drvdata(pdev, rdev);
169
170anatop_probe_end:
171 if (ret)
172 kfree(sreg->name);
173
174 return ret;
175}
176
177static int __devexit anatop_regulator_remove(struct platform_device *pdev)
178{
179 struct regulator_dev *rdev = platform_get_drvdata(pdev);
180 struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
181 const char *name = sreg->name;
182
183 regulator_unregister(rdev);
184 kfree(name);
185
186 return 0;
187}
188
189static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
190 { .compatible = "fsl,anatop-regulator", },
191 { /* end */ }
192};
193
194static struct platform_driver anatop_regulator_driver = {
195 .driver = {
196 .name = "anatop_regulator",
197 .owner = THIS_MODULE,
198 .of_match_table = of_anatop_regulator_match_tbl,
199 },
200 .probe = anatop_regulator_probe,
201 .remove = __devexit_p(anatop_regulator_remove),
202};
203
204static int __init anatop_regulator_init(void)
205{
206 return platform_driver_register(&anatop_regulator_driver);
207}
208postcore_initcall(anatop_regulator_init);
209
210static void __exit anatop_regulator_exit(void)
211{
212 platform_driver_unregister(&anatop_regulator_driver);
213}
214module_exit(anatop_regulator_exit);
215
216MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
217 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
218MODULE_DESCRIPTION("ANATOP Regulator driver");
219MODULE_LICENSE("GPL v2");