1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Regulator Driver for Freescale MC13xxx PMIC 4 // 5 // Copyright 2010 Yong Shen <yong.shen@linaro.org> 6 // 7 // Based on mc13783 regulator driver : 8 // Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 9 // Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> 10 // 11 // Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file 12 // from freescale 13 14 #include <linux/mfd/mc13xxx.h> 15 #include <linux/regulator/machine.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/of_regulator.h> 18 #include <linux/platform_device.h> 19 #include <linux/kernel.h> 20 #include <linux/slab.h> 21 #include <linux/init.h> 22 #include <linux/err.h> 23 #include <linux/module.h> 24 #include <linux/of.h> 25 #include "mc13xxx.h" 26 27 static int mc13xxx_regulator_enable(struct regulator_dev *rdev) 28 { 29 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 30 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 31 int id = rdev_get_id(rdev); 32 33 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 34 35 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 36 mc13xxx_regulators[id].enable_bit, 37 mc13xxx_regulators[id].enable_bit); 38 } 39 40 static int mc13xxx_regulator_disable(struct regulator_dev *rdev) 41 { 42 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 43 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 44 int id = rdev_get_id(rdev); 45 46 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 47 48 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, 49 mc13xxx_regulators[id].enable_bit, 0); 50 } 51 52 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) 53 { 54 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 55 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 56 int ret, id = rdev_get_id(rdev); 57 unsigned int val; 58 59 ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); 60 if (ret) 61 return ret; 62 63 return (val & mc13xxx_regulators[id].enable_bit) != 0; 64 } 65 66 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev, 67 unsigned selector) 68 { 69 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 70 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 71 int id = rdev_get_id(rdev); 72 73 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, 74 mc13xxx_regulators[id].vsel_mask, 75 selector << mc13xxx_regulators[id].vsel_shift); 76 } 77 78 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) 79 { 80 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); 81 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; 82 int ret, id = rdev_get_id(rdev); 83 unsigned int val; 84 85 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); 86 87 ret = mc13xxx_reg_read(priv->mc13xxx, 88 mc13xxx_regulators[id].vsel_reg, &val); 89 if (ret) 90 return ret; 91 92 val = (val & mc13xxx_regulators[id].vsel_mask) 93 >> mc13xxx_regulators[id].vsel_shift; 94 95 dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); 96 97 BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); 98 99 return rdev->desc->volt_table[val]; 100 } 101 102 const struct regulator_ops mc13xxx_regulator_ops = { 103 .enable = mc13xxx_regulator_enable, 104 .disable = mc13xxx_regulator_disable, 105 .is_enabled = mc13xxx_regulator_is_enabled, 106 .list_voltage = regulator_list_voltage_table, 107 .set_voltage_sel = mc13xxx_regulator_set_voltage_sel, 108 .get_voltage = mc13xxx_regulator_get_voltage, 109 }; 110 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); 111 112 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, 113 int max_uV, unsigned *selector) 114 { 115 int id = rdev_get_id(rdev); 116 117 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", 118 __func__, id, min_uV, max_uV); 119 120 if (min_uV <= rdev->desc->volt_table[0] && 121 rdev->desc->volt_table[0] <= max_uV) { 122 *selector = 0; 123 return 0; 124 } else { 125 return -EINVAL; 126 } 127 } 128 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); 129 130 const struct regulator_ops mc13xxx_fixed_regulator_ops = { 131 .enable = mc13xxx_regulator_enable, 132 .disable = mc13xxx_regulator_disable, 133 .is_enabled = mc13xxx_regulator_is_enabled, 134 .list_voltage = regulator_list_voltage_table, 135 .set_voltage = mc13xxx_fixed_regulator_set_voltage, 136 }; 137 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); 138 139 #ifdef CONFIG_OF 140 int mc13xxx_get_num_regulators_dt(struct platform_device *pdev) 141 { 142 struct device_node *parent; 143 int num; 144 145 if (!pdev->dev.parent->of_node) 146 return -ENODEV; 147 148 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); 149 if (!parent) 150 return -ENODEV; 151 152 num = of_get_child_count(parent); 153 of_node_put(parent); 154 return num; 155 } 156 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt); 157 158 struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt( 159 struct platform_device *pdev, struct mc13xxx_regulator *regulators, 160 int num_regulators) 161 { 162 struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev); 163 struct mc13xxx_regulator_init_data *data, *p; 164 struct device_node *parent, *child; 165 int i, parsed = 0; 166 167 if (!pdev->dev.parent->of_node) 168 return NULL; 169 170 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); 171 if (!parent) 172 return NULL; 173 174 data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data), 175 GFP_KERNEL); 176 if (!data) { 177 of_node_put(parent); 178 return NULL; 179 } 180 181 p = data; 182 183 for_each_child_of_node(parent, child) { 184 int found = 0; 185 186 for (i = 0; i < num_regulators; i++) { 187 if (!regulators[i].desc.name) 188 continue; 189 if (of_node_name_eq(child, 190 regulators[i].desc.name)) { 191 p->id = i; 192 p->init_data = of_get_regulator_init_data( 193 &pdev->dev, child, 194 ®ulators[i].desc); 195 p->node = child; 196 p++; 197 198 parsed++; 199 found = 1; 200 break; 201 } 202 } 203 204 if (!found) 205 dev_warn(&pdev->dev, 206 "Unknown regulator: %pOFn\n", child); 207 } 208 of_node_put(parent); 209 210 priv->num_regulators = parsed; 211 212 return data; 213 } 214 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt); 215 #endif 216 217 MODULE_LICENSE("GPL v2"); 218 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); 219 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); 220 MODULE_ALIAS("mc13xxx-regulator-core"); 221