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_sel(struct regulator_dev *reg, unsigned selector)
48 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
51 if (!anatop_reg->control_reg)
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);
64 static int anatop_get_voltage_sel(struct regulator_dev *reg)
66 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
69 if (!anatop_reg->control_reg)
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;
76 return val - anatop_reg->min_bit_val;
79 static 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,
86 static int __devinit anatop_regulator_probe(struct platform_device *pdev)
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 = { };
98 initdata = of_get_regulator_init_data(dev, np);
99 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
102 sreg->initdata = initdata;
103 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
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",
115 dev_err(dev, "no anatop-reg-offset property set\n");
116 goto anatop_probe_end;
118 ret = of_property_read_u32(np, "anatop-vol-bit-width",
119 &sreg->vol_bit_width);
121 dev_err(dev, "no anatop-vol-bit-width property set\n");
122 goto anatop_probe_end;
124 ret = of_property_read_u32(np, "anatop-vol-bit-shift",
125 &sreg->vol_bit_shift);
127 dev_err(dev, "no anatop-vol-bit-shift property set\n");
128 goto anatop_probe_end;
130 ret = of_property_read_u32(np, "anatop-min-bit-val",
133 dev_err(dev, "no anatop-min-bit-val property set\n");
134 goto anatop_probe_end;
136 ret = of_property_read_u32(np, "anatop-min-voltage",
139 dev_err(dev, "no anatop-min-voltage property set\n");
140 goto anatop_probe_end;
142 ret = of_property_read_u32(np, "anatop-max-voltage",
145 dev_err(dev, "no anatop-max-voltage property set\n");
146 goto anatop_probe_end;
149 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
151 rdesc->min_uV = sreg->min_voltage;
152 rdesc->uV_step = 25000;
154 config.dev = &pdev->dev;
155 config.init_data = initdata;
156 config.driver_data = sreg;
157 config.of_node = pdev->dev.of_node;
159 /* register regulator */
160 rdev = regulator_register(rdesc, &config);
162 dev_err(dev, "failed to register %s\n",
165 goto anatop_probe_end;
168 platform_set_drvdata(pdev, rdev);
177 static int __devexit anatop_regulator_remove(struct platform_device *pdev)
179 struct regulator_dev *rdev = platform_get_drvdata(pdev);
180 struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
181 const char *name = sreg->name;
183 regulator_unregister(rdev);
189 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
190 { .compatible = "fsl,anatop-regulator", },
194 static struct platform_driver anatop_regulator_driver = {
196 .name = "anatop_regulator",
197 .owner = THIS_MODULE,
198 .of_match_table = of_anatop_regulator_match_tbl,
200 .probe = anatop_regulator_probe,
201 .remove = __devexit_p(anatop_regulator_remove),
204 static int __init anatop_regulator_init(void)
206 return platform_driver_register(&anatop_regulator_driver);
208 postcore_initcall(anatop_regulator_init);
210 static void __exit anatop_regulator_exit(void)
212 platform_driver_unregister(&anatop_regulator_driver);
214 module_exit(anatop_regulator_exit);
216 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
217 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
218 MODULE_DESCRIPTION("ANATOP Regulator driver");
219 MODULE_LICENSE("GPL v2");