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