drivers/regulator/anatop-regulator.c

   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
  34 struct 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
  47 static 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
  58 static 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
  68 static 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
  75 static 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
 172 anatop_probe_end:
 173         if (ret)
 174                 kfree(sreg->name);
 175
 176         return ret;
 177 }
 178
 179 static 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
 191 static struct of_device_id of_anatop_regulator_match_tbl[] = {
 192         { .compatible = "fsl,anatop-regulator", },
 193         { /* end */ }
 194 };
 195
 196 static 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
 206 static int __init anatop_regulator_init(void)
 207 {
 208         return platform_driver_register(&anatop_regulator_driver);
 209 }
 210 postcore_initcall(anatop_regulator_init);
 211
 212 static void __exit anatop_regulator_exit(void)
 213 {
 214         platform_driver_unregister(&anatop_regulator_driver);
 215 }
 216 module_exit(anatop_regulator_exit);
 217
 218 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
 219               "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
 220 MODULE_DESCRIPTION("ANATOP Regulator driver");
 221 MODULE_LICENSE("GPL v2");