2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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.
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.
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.
21 #include <linux/slab.h>
22 #include <linux/device.h>
23 #include <linux/module.h>
24 #include <linux/err.h>
26 #include <linux/platform_device.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>
33 struct anatop_regulator {
42 struct regulator_desc rdesc;
43 struct regulator_init_data *initdata;
46 static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
47 int max_uV, unsigned *selector)
49 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
54 dev_dbg(®->dev, "%s: uv %d, min %d, max %d\n", __func__,
55 uv, anatop_reg->min_voltage,
56 anatop_reg->max_voltage);
58 if (uv < anatop_reg->min_voltage) {
59 if (max_uV > anatop_reg->min_voltage)
60 uv = anatop_reg->min_voltage;
65 if (!anatop_reg->control_reg)
68 sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);
69 if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)
71 val = anatop_reg->min_bit_val + 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,
83 static int anatop_get_voltage_sel(struct regulator_dev *reg)
85 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
88 if (!anatop_reg->control_reg)
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);
96 return val - anatop_reg->min_bit_val;
99 static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
101 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
104 uv = anatop_reg->min_voltage + selector * 25000;
105 dev_dbg(®->dev, "vddio = %d, selector = %u\n", uv, selector);
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,
116 static int __devinit anatop_regulator_probe(struct platform_device *pdev)
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);
127 initdata = of_get_regulator_init_data(dev, np);
128 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
131 sreg->initdata = initdata;
132 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
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, "anatop-reg-offset",
144 dev_err(dev, "no anatop-reg-offset property set\n");
145 goto anatop_probe_end;
147 ret = of_property_read_u32(np, "anatop-vol-bit-width",
148 &sreg->vol_bit_width);
150 dev_err(dev, "no anatop-vol-bit-width property set\n");
151 goto anatop_probe_end;
153 ret = of_property_read_u32(np, "anatop-vol-bit-shift",
154 &sreg->vol_bit_shift);
156 dev_err(dev, "no anatop-vol-bit-shift property set\n");
157 goto anatop_probe_end;
159 ret = of_property_read_u32(np, "anatop-min-bit-val",
162 dev_err(dev, "no anatop-min-bit-val property set\n");
163 goto anatop_probe_end;
165 ret = of_property_read_u32(np, "anatop-min-voltage",
168 dev_err(dev, "no anatop-min-voltage property set\n");
169 goto anatop_probe_end;
171 ret = of_property_read_u32(np, "anatop-max-voltage",
174 dev_err(dev, "no anatop-max-voltage property set\n");
175 goto anatop_probe_end;
178 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
181 /* register regulator */
182 rdev = regulator_register(rdesc, dev,
183 initdata, sreg, pdev->dev.of_node);
185 dev_err(dev, "failed to register %s\n",
188 goto anatop_probe_end;
191 platform_set_drvdata(pdev, rdev);
200 static int __devexit anatop_regulator_remove(struct platform_device *pdev)
202 struct regulator_dev *rdev = platform_get_drvdata(pdev);
203 struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
204 const char *name = sreg->name;
206 regulator_unregister(rdev);
212 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
213 { .compatible = "fsl,anatop-regulator", },
217 static struct platform_driver anatop_regulator_driver = {
219 .name = "anatop_regulator",
220 .owner = THIS_MODULE,
221 .of_match_table = of_anatop_regulator_match_tbl,
223 .probe = anatop_regulator_probe,
224 .remove = anatop_regulator_remove,
227 static int __init anatop_regulator_init(void)
229 return platform_driver_register(&anatop_regulator_driver);
231 postcore_initcall(anatop_regulator_init);
233 static void __exit anatop_regulator_exit(void)
235 platform_driver_unregister(&anatop_regulator_driver);
237 module_exit(anatop_regulator_exit);
239 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
240 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
241 MODULE_DESCRIPTION("ANATOP Regulator driver");
242 MODULE_LICENSE("GPL v2");