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 int ret; 37 38 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 39 40 mc13xxx_lock(priv->mc13xxx); 41 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 42 mc13xxx_regulators[id].enable_bit, 43 mc13xxx_regulators[id].enable_bit); 44 mc13xxx_unlock(priv->mc13xxx); 45 46 return ret; 47 } 48 49 static int mc13xxx_regulator_disable(struct regulator_dev *rdev) 50 { 51 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 52 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 53 int id = rdev_get_id(rdev); 54 int ret; 55 56 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 57 58 mc13xxx_lock(priv->mc13xxx); 59 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 60 mc13xxx_regulators[id].enable_bit, 0); 61 mc13xxx_unlock(priv->mc13xxx); 62 63 return ret; 64 } 65 66 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) 67 { 68 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 69 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 70 int ret, id = rdev_get_id(rdev); 71 unsigned int val; 72 73 mc13xxx_lock(priv->mc13xxx); 74 ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); 75 mc13xxx_unlock(priv->mc13xxx); 76 77 if (ret) 78 return ret; 79 80 return (val & mc13xxx_regulators[id].enable_bit) != 0; 81 } 82 83 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev, 84 unsigned selector) 85 { 86 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 87 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 88 int id = rdev_get_id(rdev); 89 int ret; 90 91 mc13xxx_lock(priv->mc13xxx); 92 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, 93 mc13xxx_regulators[id].vsel_mask, 94 selector << mc13xxx_regulators[id].vsel_shift); 95 mc13xxx_unlock(priv->mc13xxx); 96 97 return ret; 98 } 99 100 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) 101 { 102 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 103 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 104 int ret, id = rdev_get_id(rdev); 105 unsigned int val; 106 107 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 108 109 mc13xxx_lock(priv->mc13xxx); 110 ret = mc13xxx_reg_read(priv->mc13xxx, 111 mc13xxx_regulators[id].vsel_reg, &val); 112 mc13xxx_unlock(priv->mc13xxx); 113 114 if (ret) 115 return ret; 116 117 val = (val & mc13xxx_regulators[id].vsel_mask) 118 >> mc13xxx_regulators[id].vsel_shift; 119 120 dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); 121 122 BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); 123 124 return rdev->desc->volt_table[val]; 125 } 126 127 struct regulator_ops mc13xxx_regulator_ops = { 128 .enable = mc13xxx_regulator_enable, 129 .disable = mc13xxx_regulator_disable, 130 .is_enabled = mc13xxx_regulator_is_enabled, 131 .list_voltage = regulator_list_voltage_table, 132 .set_voltage_sel = mc13xxx_regulator_set_voltage_sel, 133 .get_voltage = mc13xxx_regulator_get_voltage, 134 }; 135 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); 136 137 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, 138 int max_uV, unsigned *selector) 139 { 140 int id = rdev_get_id(rdev); 141 142 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", 143 __func__, id, min_uV, max_uV); 144 145 if (min_uV <= rdev->desc->volt_table[0] && 146 rdev->desc->volt_table[0] <= max_uV) { 147 *selector = 0; 148 return 0; 149 } else { 150 return -EINVAL; 151 } 152 } 153 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); 154 155 struct regulator_ops mc13xxx_fixed_regulator_ops = { 156 .enable = mc13xxx_regulator_enable, 157 .disable = mc13xxx_regulator_disable, 158 .is_enabled = mc13xxx_regulator_is_enabled, 159 .list_voltage = regulator_list_voltage_table, 160 .set_voltage = mc13xxx_fixed_regulator_set_voltage, 161 }; 162 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); 163 164 #ifdef CONFIG_OF 165 int mc13xxx_get_num_regulators_dt(struct platform_device *pdev) 166 { 167 struct device_node *parent; 168 int num; 169 170 of_node_get(pdev->dev.parent->of_node); 171 parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators"); 172 if (!parent) 173 return -ENODEV; 174 175 num = of_get_child_count(parent); 176 of_node_put(parent); 177 return num; 178 } 179 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt); 180 181 struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt( 182 struct platform_device *pdev, struct mc13xxx_regulator *regulators, 183 int num_regulators) 184 { 185 struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev); 186 struct mc13xxx_regulator_init_data *data, *p; 187 struct device_node *parent, *child; 188 int i, parsed = 0; 189 190 of_node_get(pdev->dev.parent->of_node); 191 parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators"); 192 if (!parent) 193 return NULL; 194 195 data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators, 196 GFP_KERNEL); 197 if (!data) { 198 of_node_put(parent); 199 return NULL; 200 } 201 202 p = data; 203 204 for_each_child_of_node(parent, child) { 205 int found = 0; 206 207 for (i = 0; i < num_regulators; i++) { 208 if (!regulators[i].desc.name) 209 continue; 210 if (!of_node_cmp(child->name, 211 regulators[i].desc.name)) { 212 p->id = i; 213 p->init_data = of_get_regulator_init_data( 214 &pdev->dev, child); 215 p->node = child; 216 p++; 217 218 parsed++; 219 found = 1; 220 break; 221 } 222 } 223 224 if (!found) 225 dev_warn(&pdev->dev, 226 "Unknown regulator: %s\n", child->name); 227 } 228 of_node_put(parent); 229 230 priv->num_regulators = parsed; 231 232 return data; 233 } 234 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt); 235 #endif 236 237 MODULE_LICENSE("GPL v2"); 238 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); 239 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); 240 MODULE_ALIAS("mc13xxx-regulator-core"); 241