| 1 | /* |
| 2 | * Regulator Driver for Freescale MC13xxx PMIC |
| 3 | * |
| 4 | * Copyright 2010 Yong Shen <yong.shen@linaro.org> |
| 5 | * |
| 6 | * Based on mc13783 regulator driver : |
| 7 | * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> |
| 8 | * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file |
| 15 | * from freescale |
| 16 | */ |
| 17 | |
| 18 | #include <linux/mfd/mc13xxx.h> |
| 19 | #include <linux/regulator/machine.h> |
| 20 | #include <linux/regulator/driver.h> |
| 21 | #include <linux/regulator/of_regulator.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/of.h> |
| 29 | #include "mc13xxx.h" |
| 30 | |
| 31 | static int mc13xxx_regulator_enable(struct regulator_dev *rdev) |
| 32 | { |
| 33 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 34 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 35 | int id = rdev_get_id(rdev); |
| 36 | |
| 37 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 38 | |
| 39 | return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, |
| 40 | mc13xxx_regulators[id].enable_bit, |
| 41 | mc13xxx_regulators[id].enable_bit); |
| 42 | } |
| 43 | |
| 44 | static int mc13xxx_regulator_disable(struct regulator_dev *rdev) |
| 45 | { |
| 46 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 47 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 48 | int id = rdev_get_id(rdev); |
| 49 | |
| 50 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 51 | |
| 52 | return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, |
| 53 | mc13xxx_regulators[id].enable_bit, 0); |
| 54 | } |
| 55 | |
| 56 | static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) |
| 57 | { |
| 58 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 59 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 60 | int ret, id = rdev_get_id(rdev); |
| 61 | unsigned int val; |
| 62 | |
| 63 | ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); |
| 64 | if (ret) |
| 65 | return ret; |
| 66 | |
| 67 | return (val & mc13xxx_regulators[id].enable_bit) != 0; |
| 68 | } |
| 69 | |
| 70 | static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev, |
| 71 | unsigned selector) |
| 72 | { |
| 73 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 74 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 75 | int id = rdev_get_id(rdev); |
| 76 | |
| 77 | return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, |
| 78 | mc13xxx_regulators[id].vsel_mask, |
| 79 | selector << mc13xxx_regulators[id].vsel_shift); |
| 80 | } |
| 81 | |
| 82 | static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) |
| 83 | { |
| 84 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 85 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 86 | int ret, id = rdev_get_id(rdev); |
| 87 | unsigned int val; |
| 88 | |
| 89 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 90 | |
| 91 | ret = mc13xxx_reg_read(priv->mc13xxx, |
| 92 | mc13xxx_regulators[id].vsel_reg, &val); |
| 93 | if (ret) |
| 94 | return ret; |
| 95 | |
| 96 | val = (val & mc13xxx_regulators[id].vsel_mask) |
| 97 | >> mc13xxx_regulators[id].vsel_shift; |
| 98 | |
| 99 | dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); |
| 100 | |
| 101 | BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); |
| 102 | |
| 103 | return rdev->desc->volt_table[val]; |
| 104 | } |
| 105 | |
| 106 | struct regulator_ops mc13xxx_regulator_ops = { |
| 107 | .enable = mc13xxx_regulator_enable, |
| 108 | .disable = mc13xxx_regulator_disable, |
| 109 | .is_enabled = mc13xxx_regulator_is_enabled, |
| 110 | .list_voltage = regulator_list_voltage_table, |
| 111 | .set_voltage_sel = mc13xxx_regulator_set_voltage_sel, |
| 112 | .get_voltage = mc13xxx_regulator_get_voltage, |
| 113 | }; |
| 114 | EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); |
| 115 | |
| 116 | int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, |
| 117 | int max_uV, unsigned *selector) |
| 118 | { |
| 119 | int id = rdev_get_id(rdev); |
| 120 | |
| 121 | dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", |
| 122 | __func__, id, min_uV, max_uV); |
| 123 | |
| 124 | if (min_uV <= rdev->desc->volt_table[0] && |
| 125 | rdev->desc->volt_table[0] <= max_uV) { |
| 126 | *selector = 0; |
| 127 | return 0; |
| 128 | } else { |
| 129 | return -EINVAL; |
| 130 | } |
| 131 | } |
| 132 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); |
| 133 | |
| 134 | struct regulator_ops mc13xxx_fixed_regulator_ops = { |
| 135 | .enable = mc13xxx_regulator_enable, |
| 136 | .disable = mc13xxx_regulator_disable, |
| 137 | .is_enabled = mc13xxx_regulator_is_enabled, |
| 138 | .list_voltage = regulator_list_voltage_table, |
| 139 | .set_voltage = mc13xxx_fixed_regulator_set_voltage, |
| 140 | }; |
| 141 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); |
| 142 | |
| 143 | #ifdef CONFIG_OF |
| 144 | int mc13xxx_get_num_regulators_dt(struct platform_device *pdev) |
| 145 | { |
| 146 | struct device_node *parent; |
| 147 | int num; |
| 148 | |
| 149 | if (!pdev->dev.parent->of_node) |
| 150 | return -ENODEV; |
| 151 | |
| 152 | parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); |
| 153 | if (!parent) |
| 154 | return -ENODEV; |
| 155 | |
| 156 | num = of_get_child_count(parent); |
| 157 | of_node_put(parent); |
| 158 | return num; |
| 159 | } |
| 160 | EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt); |
| 161 | |
| 162 | struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt( |
| 163 | struct platform_device *pdev, struct mc13xxx_regulator *regulators, |
| 164 | int num_regulators) |
| 165 | { |
| 166 | struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev); |
| 167 | struct mc13xxx_regulator_init_data *data, *p; |
| 168 | struct device_node *parent, *child; |
| 169 | int i, parsed = 0; |
| 170 | |
| 171 | if (!pdev->dev.parent->of_node) |
| 172 | return NULL; |
| 173 | |
| 174 | parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); |
| 175 | if (!parent) |
| 176 | return NULL; |
| 177 | |
| 178 | data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators, |
| 179 | GFP_KERNEL); |
| 180 | if (!data) { |
| 181 | of_node_put(parent); |
| 182 | return NULL; |
| 183 | } |
| 184 | |
| 185 | p = data; |
| 186 | |
| 187 | for_each_child_of_node(parent, child) { |
| 188 | int found = 0; |
| 189 | |
| 190 | for (i = 0; i < num_regulators; i++) { |
| 191 | if (!regulators[i].desc.name) |
| 192 | continue; |
| 193 | if (!of_node_cmp(child->name, |
| 194 | regulators[i].desc.name)) { |
| 195 | p->id = i; |
| 196 | p->init_data = of_get_regulator_init_data( |
| 197 | &pdev->dev, child, |
| 198 | ®ulators[i].desc); |
| 199 | p->node = child; |
| 200 | p++; |
| 201 | |
| 202 | parsed++; |
| 203 | found = 1; |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | if (!found) |
| 209 | dev_warn(&pdev->dev, |
| 210 | "Unknown regulator: %s\n", child->name); |
| 211 | } |
| 212 | of_node_put(parent); |
| 213 | |
| 214 | priv->num_regulators = parsed; |
| 215 | |
| 216 | return data; |
| 217 | } |
| 218 | EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt); |
| 219 | #endif |
| 220 | |
| 221 | MODULE_LICENSE("GPL v2"); |
| 222 | MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); |
| 223 | MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); |
| 224 | MODULE_ALIAS("mc13xxx-regulator-core"); |