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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 | ||
33 | struct 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 | ||
46 | static int anatop_set_voltage(struct regulator_dev *reg, int min_uV, | |
47 | int max_uV, unsigned *selector) | |
48 | { | |
49 | struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); | |
50 | u32 val, sel; | |
51 | int uv; | |
52 | ||
53 | uv = min_uV; | |
54 | dev_dbg(®->dev, "%s: uv %d, min %d, max %d\n", __func__, | |
55 | uv, anatop_reg->min_voltage, | |
56 | anatop_reg->max_voltage); | |
57 | ||
58 | if (uv < anatop_reg->min_voltage) { | |
59 | if (max_uV > anatop_reg->min_voltage) | |
60 | uv = anatop_reg->min_voltage; | |
61 | else | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | if (!anatop_reg->control_reg) | |
66 | return -ENOTSUPP; | |
67 | ||
68 | sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000); | |
69 | if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage) | |
70 | return -EINVAL; | |
71 | val = anatop_reg->min_bit_val + sel; | |
72 | *selector = sel; | |
73 | dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val); | |
74 | anatop_set_bits(anatop_reg->mfd, | |
75 | anatop_reg->control_reg, | |
76 | anatop_reg->vol_bit_shift, | |
77 | anatop_reg->vol_bit_width, | |
78 | val); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int anatop_get_voltage_sel(struct regulator_dev *reg) | |
84 | { | |
85 | struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); | |
86 | u32 val; | |
87 | ||
88 | if (!anatop_reg->control_reg) | |
89 | return -ENOTSUPP; | |
90 | ||
91 | val = anatop_get_bits(anatop_reg->mfd, | |
92 | anatop_reg->control_reg, | |
93 | anatop_reg->vol_bit_shift, | |
94 | anatop_reg->vol_bit_width); | |
95 | ||
96 | return val - anatop_reg->min_bit_val; | |
97 | } | |
98 | ||
99 | static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector) | |
100 | { | |
101 | struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg); | |
102 | int uv; | |
103 | ||
104 | uv = anatop_reg->min_voltage + selector * 25000; | |
105 | dev_dbg(®->dev, "vddio = %d, selector = %u\n", uv, selector); | |
106 | ||
107 | return uv; | |
108 | } | |
109 | ||
110 | static struct regulator_ops anatop_rops = { | |
111 | .set_voltage = anatop_set_voltage, | |
112 | .get_voltage_sel = anatop_get_voltage_sel, | |
113 | .list_voltage = anatop_list_voltage, | |
114 | }; | |
115 | ||
116 | static int __devinit anatop_regulator_probe(struct platform_device *pdev) | |
117 | { | |
118 | struct device *dev = &pdev->dev; | |
119 | struct device_node *np = dev->of_node; | |
120 | struct regulator_desc *rdesc; | |
121 | struct regulator_dev *rdev; | |
122 | struct anatop_regulator *sreg; | |
123 | struct regulator_init_data *initdata; | |
124 | struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent); | |
125 | int ret = 0; | |
126 | ||
127 | initdata = of_get_regulator_init_data(dev, np); | |
128 | sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL); | |
129 | if (!sreg) | |
130 | return -ENOMEM; | |
131 | sreg->initdata = initdata; | |
132 | sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL), | |
133 | GFP_KERNEL); | |
134 | rdesc = &sreg->rdesc; | |
135 | memset(rdesc, 0, sizeof(*rdesc)); | |
136 | rdesc->name = sreg->name; | |
137 | rdesc->ops = &anatop_rops; | |
138 | rdesc->type = REGULATOR_VOLTAGE; | |
139 | rdesc->owner = THIS_MODULE; | |
140 | sreg->mfd = anatopmfd; | |
141 | ret = of_property_read_u32(np, "reg", &sreg->control_reg); | |
142 | if (ret) { | |
143 | dev_err(dev, "no reg property set\n"); | |
144 | goto anatop_probe_end; | |
145 | } | |
146 | ret = of_property_read_u32(np, "anatop-vol-bit-width", | |
147 | &sreg->vol_bit_width); | |
148 | if (ret) { | |
149 | dev_err(dev, "no anatop-vol-bit-width property set\n"); | |
150 | goto anatop_probe_end; | |
151 | } | |
152 | ret = of_property_read_u32(np, "anatop-vol-bit-shift", | |
153 | &sreg->vol_bit_shift); | |
154 | if (ret) { | |
155 | dev_err(dev, "no anatop-vol-bit-shift property set\n"); | |
156 | goto anatop_probe_end; | |
157 | } | |
158 | ret = of_property_read_u32(np, "anatop-min-bit-val", | |
159 | &sreg->min_bit_val); | |
160 | if (ret) { | |
161 | dev_err(dev, "no anatop-min-bit-val property set\n"); | |
162 | goto anatop_probe_end; | |
163 | } | |
164 | ret = of_property_read_u32(np, "anatop-min-voltage", | |
165 | &sreg->min_voltage); | |
166 | if (ret) { | |
167 | dev_err(dev, "no anatop-min-voltage property set\n"); | |
168 | goto anatop_probe_end; | |
169 | } | |
170 | ret = of_property_read_u32(np, "anatop-max-voltage", | |
171 | &sreg->max_voltage); | |
172 | if (ret) { | |
173 | dev_err(dev, "no anatop-max-voltage property set\n"); | |
174 | goto anatop_probe_end; | |
175 | } | |
176 | ||
177 | rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) | |
178 | / 25000 + 1; | |
179 | ||
180 | /* register regulator */ | |
181 | rdev = regulator_register(rdesc, dev, | |
182 | initdata, sreg, pdev->dev.of_node); | |
183 | if (IS_ERR(rdev)) { | |
184 | dev_err(dev, "failed to register %s\n", | |
185 | rdesc->name); | |
186 | ret = PTR_ERR(rdev); | |
187 | goto anatop_probe_end; | |
188 | } | |
189 | ||
190 | platform_set_drvdata(pdev, rdev); | |
191 | ||
192 | anatop_probe_end: | |
193 | if (ret) | |
194 | kfree(sreg->name); | |
195 | ||
196 | return ret; | |
197 | } | |
198 | ||
199 | static int __devexit anatop_regulator_remove(struct platform_device *pdev) | |
200 | { | |
201 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
202 | struct anatop_regulator *sreg = rdev_get_drvdata(rdev); | |
203 | const char *name = sreg->name; | |
204 | ||
205 | regulator_unregister(rdev); | |
206 | kfree(name); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = { | |
212 | { .compatible = "fsl,anatop-regulator", }, | |
213 | { /* end */ } | |
214 | }; | |
215 | ||
216 | static struct platform_driver anatop_regulator = { | |
217 | .driver = { | |
218 | .name = "anatop_regulator", | |
219 | .owner = THIS_MODULE, | |
220 | .of_match_table = of_anatop_regulator_match_tbl, | |
221 | }, | |
222 | .probe = anatop_regulator_probe, | |
223 | .remove = anatop_regulator_remove, | |
224 | }; | |
225 | ||
226 | static int __init anatop_regulator_init(void) | |
227 | { | |
228 | return platform_driver_register(&anatop_regulator); | |
229 | } | |
230 | postcore_initcall(anatop_regulator_init); | |
231 | ||
232 | static void __exit anatop_regulator_exit(void) | |
233 | { | |
234 | platform_driver_unregister(&anatop_regulator); | |
235 | } | |
236 | module_exit(anatop_regulator_exit); | |
237 | ||
238 | MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, " | |
239 | "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>"); | |
240 | MODULE_DESCRIPTION("ANATOP Regulator driver"); | |
241 | MODULE_LICENSE("GPL v2"); |