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
  52        if (!anatop_reg->control_reg)
  53                return -ENOTSUPP;
  54
  55        return regulator_set_voltage_sel_regmap(reg, selector);
  56}
  57
  58static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
  59{
  60        struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
  61
  62        if (!anatop_reg->control_reg)
  63                return -ENOTSUPP;
  64
  65        return regulator_get_voltage_sel_regmap(reg);
  66}
  67
  68static struct regulator_ops anatop_rops = {
  69        .set_voltage_sel = anatop_regmap_set_voltage_sel,
  70        .get_voltage_sel = anatop_regmap_get_voltage_sel,
  71        .list_voltage = regulator_list_voltage_linear,
  72        .map_voltage = regulator_map_voltage_linear,
  73};
  74
  75static int anatop_regulator_probe(struct platform_device *pdev)
  76{
  77        struct device *dev = &pdev->dev;
  78        struct device_node *np = dev->of_node;
  79        struct device_node *anatop_np;
  80        struct regulator_desc *rdesc;
  81        struct regulator_dev *rdev;
  82        struct anatop_regulator *sreg;
  83        struct regulator_init_data *initdata;
  84        struct regulator_config config = { };
  85        int ret = 0;
  86
  87        initdata = of_get_regulator_init_data(dev, np);
  88        sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
  89        if (!sreg)
  90                return -ENOMEM;
  91        sreg->initdata = initdata;
  92        sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
  93                             GFP_KERNEL);
  94        rdesc = &sreg->rdesc;
  95        memset(rdesc, 0, sizeof(*rdesc));
  96        rdesc->name = sreg->name;
  97        rdesc->ops = &anatop_rops;
  98        rdesc->type = REGULATOR_VOLTAGE;
  99        rdesc->owner = THIS_MODULE;
 100
 101        anatop_np = of_get_parent(np);
 102        if (!anatop_np)
 103                return -ENODEV;
 104        sreg->anatop = syscon_node_to_regmap(anatop_np);
 105        of_node_put(anatop_np);
 106        if (IS_ERR(sreg->anatop))
 107                return PTR_ERR(sreg->anatop);
 108
 109        ret = of_property_read_u32(np, "anatop-reg-offset",
 110                                   &sreg->control_reg);
 111        if (ret) {
 112                dev_err(dev, "no anatop-reg-offset property set\n");
 113                goto anatop_probe_end;
 114        }
 115        ret = of_property_read_u32(np, "anatop-vol-bit-width",
 116                                   &sreg->vol_bit_width);
 117        if (ret) {
 118                dev_err(dev, "no anatop-vol-bit-width property set\n");
 119                goto anatop_probe_end;
 120        }
 121        ret = of_property_read_u32(np, "anatop-vol-bit-shift",
 122                                   &sreg->vol_bit_shift);
 123        if (ret) {
 124                dev_err(dev, "no anatop-vol-bit-shift property set\n");
 125                goto anatop_probe_end;
 126        }
 127        ret = of_property_read_u32(np, "anatop-min-bit-val",
 128                                   &sreg->min_bit_val);
 129        if (ret) {
 130                dev_err(dev, "no anatop-min-bit-val property set\n");
 131                goto anatop_probe_end;
 132        }
 133        ret = of_property_read_u32(np, "anatop-min-voltage",
 134                                   &sreg->min_voltage);
 135        if (ret) {
 136                dev_err(dev, "no anatop-min-voltage property set\n");
 137                goto anatop_probe_end;
 138        }
 139        ret = of_property_read_u32(np, "anatop-max-voltage",
 140                                   &sreg->max_voltage);
 141        if (ret) {
 142                dev_err(dev, "no anatop-max-voltage property set\n");
 143                goto anatop_probe_end;
 144        }
 145
 146        rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
 147                            + sreg->min_bit_val;
 148        rdesc->min_uV = sreg->min_voltage;
 149        rdesc->uV_step = 25000;
 150        rdesc->linear_min_sel = sreg->min_bit_val;
 151        rdesc->vsel_reg = sreg->control_reg;
 152        rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
 153                           sreg->vol_bit_shift;
 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        config.regmap = sreg->anatop;
 160
 161        /* register regulator */
 162        rdev = regulator_register(rdesc, &config);
 163        if (IS_ERR(rdev)) {
 164                dev_err(dev, "failed to register %s\n",
 165                        rdesc->name);
 166                ret = PTR_ERR(rdev);
 167                goto anatop_probe_end;
 168        }
 169
 170        platform_set_drvdata(pdev, rdev);
 171
 172anatop_probe_end:
 173        if (ret)
 174                kfree(sreg->name);
 175
 176        return ret;
 177}
 178
 179static int anatop_regulator_remove(struct platform_device *pdev)
 180{
 181        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 182        struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
 183        const char *name = sreg->name;
 184
 185        regulator_unregister(rdev);
 186        kfree(name);
 187
 188        return 0;
 189}
 190
 191static struct of_device_id of_anatop_regulator_match_tbl[] = {
 192        { .compatible = "fsl,anatop-regulator", },
 193        { /* end */ }
 194};
 195
 196static struct platform_driver anatop_regulator_driver = {
 197        .driver = {
 198                .name   = "anatop_regulator",
 199                .owner  = THIS_MODULE,
 200                .of_match_table = of_anatop_regulator_match_tbl,
 201        },
 202        .probe  = anatop_regulator_probe,
 203        .remove = anatop_regulator_remove,
 204};
 205
 206static int __init anatop_regulator_init(void)
 207{
 208        return platform_driver_register(&anatop_regulator_driver);
 209}
 210postcore_initcall(anatop_regulator_init);
 211
 212static void __exit anatop_regulator_exit(void)
 213{
 214        platform_driver_unregister(&anatop_regulator_driver);
 215}
 216module_exit(anatop_regulator_exit);
 217
 218MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
 219              "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
 220MODULE_DESCRIPTION("ANATOP Regulator driver");
 221MODULE_LICENSE("GPL v2");
 222
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