linux/drivers/regulator/anatop-regulator.c
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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/mfd/syscon.h>
  25#include <linux/err.h>
  26#include <linux/io.h>
  27#include <linux/platform_device.h>
  28#include <linux/of.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>
  33
  34struct anatop_regulator {
  35        const char *name;
  36        u32 control_reg;
  37        struct regmap *anatop;
  38        int vol_bit_shift;
  39        int vol_bit_width;
  40        int min_bit_val;
  41        int min_voltage;
  42        int max_voltage;
  43        struct regulator_desc rdesc;
  44        struct regulator_init_data *initdata;
  45};
  46
  47static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
  48                                        unsigned selector)
  49{
  50        struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
  51        u32 val, mask;
  52
  53        if (!anatop_reg->control_reg)
  54                return -ENOTSUPP;
  55
  56        val = anatop_reg->min_bit_val + selector;
  57        dev_dbg(&reg->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,
  62                                mask, val);
  63
  64        return 0;
  65}
  66
  67static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
  68{
  69        struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
  70        u32 val, mask;
  71
  72        if (!anatop_reg->control_reg)
  73                return -ENOTSUPP;
  74
  75        regmap_read(anatop_reg->anatop, anatop_reg->control_reg, &val);
  76        mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
  77                anatop_reg->vol_bit_shift;
  78        val = (val & mask) >> anatop_reg->vol_bit_shift;
  79
  80        return val - anatop_reg->min_bit_val;
  81}
  82
  83static struct regulator_ops anatop_rops = {
  84        .set_voltage_sel = anatop_regmap_set_voltage_sel,
  85        .get_voltage_sel = anatop_regmap_get_voltage_sel,
  86        .list_voltage = regulator_list_voltage_linear,
  87        .map_voltage = regulator_map_voltage_linear,
  88};
  89
  90static int __devinit anatop_regulator_probe(struct platform_device *pdev)
  91{
  92        struct device *dev = &pdev->dev;
  93        struct device_node *np = dev->of_node;
  94        struct device_node *anatop_np;
  95        struct regulator_desc *rdesc;
  96        struct regulator_dev *rdev;
  97        struct anatop_regulator *sreg;
  98        struct regulator_init_data *initdata;
  99        struct regulator_config config = { };
 100        int ret = 0;
 101
 102        initdata = of_get_regulator_init_data(dev, np);
 103        sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
 104        if (!sreg)
 105                return -ENOMEM;
 106        sreg->initdata = initdata;
 107        sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
 108                             GFP_KERNEL);
 109        rdesc = &sreg->rdesc;
 110        memset(rdesc, 0, sizeof(*rdesc));
 111        rdesc->name = sreg->name;
 112        rdesc->ops = &anatop_rops;
 113        rdesc->type = REGULATOR_VOLTAGE;
 114        rdesc->owner = THIS_MODULE;
 115
 116        anatop_np = of_get_parent(np);
 117        if (!anatop_np)
 118                return -ENODEV;
 119        sreg->anatop = syscon_node_to_regmap(anatop_np);
 120        of_node_put(anatop_np);
 121        if (IS_ERR(sreg->anatop))
 122                return PTR_ERR(sreg->anatop);
 123
 124        ret = of_property_read_u32(np, "anatop-reg-offset",
 125                                   &sreg->control_reg);
 126        if (ret) {
 127                dev_err(dev, "no anatop-reg-offset property set\n");
 128                goto anatop_probe_end;
 129        }
 130        ret = of_property_read_u32(np, "anatop-vol-bit-width",
 131                                   &sreg->vol_bit_width);
 132        if (ret) {
 133                dev_err(dev, "no anatop-vol-bit-width property set\n");
 134                goto anatop_probe_end;
 135        }
 136        ret = of_property_read_u32(np, "anatop-vol-bit-shift",
 137                                   &sreg->vol_bit_shift);
 138        if (ret) {
 139                dev_err(dev, "no anatop-vol-bit-shift property set\n");
 140                goto anatop_probe_end;
 141        }
 142        ret = of_property_read_u32(np, "anatop-min-bit-val",
 143                                   &sreg->min_bit_val);
 144        if (ret) {
 145                dev_err(dev, "no anatop-min-bit-val property set\n");
 146                goto anatop_probe_end;
 147        }
 148        ret = of_property_read_u32(np, "anatop-min-voltage",
 149                                   &sreg->min_voltage);
 150        if (ret) {
 151                dev_err(dev, "no anatop-min-voltage property set\n");
 152                goto anatop_probe_end;
 153        }
 154        ret = of_property_read_u32(np, "anatop-max-voltage",
 155                                   &sreg->max_voltage);
 156        if (ret) {
 157                dev_err(dev, "no anatop-max-voltage property set\n");
 158                goto anatop_probe_end;
 159        }
 160
 161        rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
 162                / 25000 + 1;
 163        rdesc->min_uV = sreg->min_voltage;
 164        rdesc->uV_step = 25000;
 165
 166        config.dev = &pdev->dev;
 167        config.init_data = initdata;
 168        config.driver_data = sreg;
 169        config.of_node = pdev->dev.of_node;
 170
 171        /* register regulator */
 172        rdev = regulator_register(rdesc, &config);
 173        if (IS_ERR(rdev)) {
 174                dev_err(dev, "failed to register %s\n",
 175                        rdesc->name);
 176                ret = PTR_ERR(rdev);
 177                goto anatop_probe_end;
 178        }
 179
 180        platform_set_drvdata(pdev, rdev);
 181
 182anatop_probe_end:
 183        if (ret)
 184                kfree(sreg->name);
 185
 186        return ret;
 187}
 188
 189static int __devexit anatop_regulator_remove(struct platform_device *pdev)
 190{
 191        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 192        struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
 193        const char *name = sreg->name;
 194
 195        regulator_unregister(rdev);
 196        kfree(name);
 197
 198        return 0;
 199}
 200
 201static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
 202        { .compatible = "fsl,anatop-regulator", },
 203        { /* end */ }
 204};
 205
 206static struct platform_driver anatop_regulator_driver = {
 207        .driver = {
 208                .name   = "anatop_regulator",
 209                .owner  = THIS_MODULE,
 210                .of_match_table = of_anatop_regulator_match_tbl,
 211        },
 212        .probe  = anatop_regulator_probe,
 213        .remove = __devexit_p(anatop_regulator_remove),
 214};
 215
 216static int __init anatop_regulator_init(void)
 217{
 218        return platform_driver_register(&anatop_regulator_driver);
 219}
 220postcore_initcall(anatop_regulator_init);
 221
 222static void __exit anatop_regulator_exit(void)
 223{
 224        platform_driver_unregister(&anatop_regulator_driver);
 225}
 226module_exit(anatop_regulator_exit);
 227
 228MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
 229              "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
 230MODULE_DESCRIPTION("ANATOP Regulator driver");
 231MODULE_LICENSE("GPL v2");
 232
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