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/mfd/syscon.h>
25 #include <linux/err.h>
27 #include <linux/platform_device.h>
29 #include <linux/of_address.h>
30 #include <linux/regmap.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/of_regulator.h>
34 struct anatop_regulator {
37 struct regmap *anatop;
43 struct regulator_desc rdesc;
44 struct regulator_init_data *initdata;
47 static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
50 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
53 if (!anatop_reg->control_reg)
56 val = anatop_reg->min_bit_val + selector;
57 dev_dbg(®->dev, "%s: calculated val %d\n", __func__, val);
58 mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
59 anatop_reg->vol_bit_shift;
60 val <<= anatop_reg->vol_bit_shift;
61 regmap_update_bits(anatop_reg->anatop, anatop_reg->control_reg,
67 static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
69 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
72 if (!anatop_reg->control_reg)
75 regmap_read(anatop_reg->anatop, anatop_reg->control_reg, &val);
76 val = (val & ((1 << anatop_reg->vol_bit_width) - 1)) >>
77 anatop_reg->vol_bit_shift;
79 return val - anatop_reg->min_bit_val;
82 static struct regulator_ops anatop_rops = {
83 .set_voltage_sel = anatop_regmap_set_voltage_sel,
84 .get_voltage_sel = anatop_regmap_get_voltage_sel,
85 .list_voltage = regulator_list_voltage_linear,
86 .map_voltage = regulator_map_voltage_linear,
89 static int __devinit anatop_regulator_probe(struct platform_device *pdev)
91 struct device *dev = &pdev->dev;
92 struct device_node *np = dev->of_node;
93 struct device_node *anatop_np;
94 struct regulator_desc *rdesc;
95 struct regulator_dev *rdev;
96 struct anatop_regulator *sreg;
97 struct regulator_init_data *initdata;
98 struct regulator_config config = { };
101 initdata = of_get_regulator_init_data(dev, np);
102 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
105 sreg->initdata = initdata;
106 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
108 rdesc = &sreg->rdesc;
109 memset(rdesc, 0, sizeof(*rdesc));
110 rdesc->name = sreg->name;
111 rdesc->ops = &anatop_rops;
112 rdesc->type = REGULATOR_VOLTAGE;
113 rdesc->owner = THIS_MODULE;
115 anatop_np = of_get_parent(np);
118 sreg->anatop = syscon_node_to_regmap(anatop_np);
119 of_node_put(anatop_np);
120 if (IS_ERR(sreg->anatop))
121 return PTR_ERR(sreg->anatop);
123 ret = of_property_read_u32(np, "anatop-reg-offset",
126 dev_err(dev, "no anatop-reg-offset property set\n");
127 goto anatop_probe_end;
129 ret = of_property_read_u32(np, "anatop-vol-bit-width",
130 &sreg->vol_bit_width);
132 dev_err(dev, "no anatop-vol-bit-width property set\n");
133 goto anatop_probe_end;
135 ret = of_property_read_u32(np, "anatop-vol-bit-shift",
136 &sreg->vol_bit_shift);
138 dev_err(dev, "no anatop-vol-bit-shift property set\n");
139 goto anatop_probe_end;
141 ret = of_property_read_u32(np, "anatop-min-bit-val",
144 dev_err(dev, "no anatop-min-bit-val property set\n");
145 goto anatop_probe_end;
147 ret = of_property_read_u32(np, "anatop-min-voltage",
150 dev_err(dev, "no anatop-min-voltage property set\n");
151 goto anatop_probe_end;
153 ret = of_property_read_u32(np, "anatop-max-voltage",
156 dev_err(dev, "no anatop-max-voltage property set\n");
157 goto anatop_probe_end;
160 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
162 rdesc->min_uV = sreg->min_voltage;
163 rdesc->uV_step = 25000;
165 config.dev = &pdev->dev;
166 config.init_data = initdata;
167 config.driver_data = sreg;
168 config.of_node = pdev->dev.of_node;
170 /* register regulator */
171 rdev = regulator_register(rdesc, &config);
173 dev_err(dev, "failed to register %s\n",
176 goto anatop_probe_end;
179 platform_set_drvdata(pdev, rdev);
188 static int __devexit anatop_regulator_remove(struct platform_device *pdev)
190 struct regulator_dev *rdev = platform_get_drvdata(pdev);
191 struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
192 const char *name = sreg->name;
194 regulator_unregister(rdev);
200 static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
201 { .compatible = "fsl,anatop-regulator", },
205 static struct platform_driver anatop_regulator_driver = {
207 .name = "anatop_regulator",
208 .owner = THIS_MODULE,
209 .of_match_table = of_anatop_regulator_match_tbl,
211 .probe = anatop_regulator_probe,
212 .remove = __devexit_p(anatop_regulator_remove),
215 static int __init anatop_regulator_init(void)
217 return platform_driver_register(&anatop_regulator_driver);
219 postcore_initcall(anatop_regulator_init);
221 static void __exit anatop_regulator_exit(void)
223 platform_driver_unregister(&anatop_regulator_driver);
225 module_exit(anatop_regulator_exit);
227 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
228 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
229 MODULE_DESCRIPTION("ANATOP Regulator driver");
230 MODULE_LICENSE("GPL v2");