Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 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/platform_device.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/err.h> |
| 26 | #include "mc13xxx.h" |
| 27 | |
| 28 | static int mc13xxx_regulator_enable(struct regulator_dev *rdev) |
| 29 | { |
| 30 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 31 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 32 | int id = rdev_get_id(rdev); |
| 33 | int ret; |
| 34 | |
| 35 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 36 | |
| 37 | mc13xxx_lock(priv->mc13xxx); |
| 38 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, |
| 39 | mc13xxx_regulators[id].enable_bit, |
| 40 | mc13xxx_regulators[id].enable_bit); |
| 41 | mc13xxx_unlock(priv->mc13xxx); |
| 42 | |
| 43 | return ret; |
| 44 | } |
| 45 | |
| 46 | static int mc13xxx_regulator_disable(struct regulator_dev *rdev) |
| 47 | { |
| 48 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 49 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 50 | int id = rdev_get_id(rdev); |
| 51 | int ret; |
| 52 | |
| 53 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 54 | |
| 55 | mc13xxx_lock(priv->mc13xxx); |
| 56 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, |
| 57 | mc13xxx_regulators[id].enable_bit, 0); |
| 58 | mc13xxx_unlock(priv->mc13xxx); |
| 59 | |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) |
| 64 | { |
| 65 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 66 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 67 | int ret, id = rdev_get_id(rdev); |
| 68 | unsigned int val; |
| 69 | |
| 70 | mc13xxx_lock(priv->mc13xxx); |
| 71 | ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); |
| 72 | mc13xxx_unlock(priv->mc13xxx); |
| 73 | |
| 74 | if (ret) |
| 75 | return ret; |
| 76 | |
| 77 | return (val & mc13xxx_regulators[id].enable_bit) != 0; |
| 78 | } |
| 79 | |
| 80 | int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev, |
| 81 | unsigned selector) |
| 82 | { |
| 83 | int id = rdev_get_id(rdev); |
| 84 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 85 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 86 | |
| 87 | if (selector >= mc13xxx_regulators[id].desc.n_voltages) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | return mc13xxx_regulators[id].voltages[selector]; |
| 91 | } |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 92 | EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 93 | |
| 94 | int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev, |
| 95 | int min_uV, int max_uV) |
| 96 | { |
| 97 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 98 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 99 | int reg_id = rdev_get_id(rdev); |
| 100 | int i; |
| 101 | int bestmatch; |
| 102 | int bestindex; |
| 103 | |
| 104 | /* |
| 105 | * Locate the minimum voltage fitting the criteria on |
| 106 | * this regulator. The switchable voltages are not |
| 107 | * in strict falling order so we need to check them |
| 108 | * all for the best match. |
| 109 | */ |
| 110 | bestmatch = INT_MAX; |
| 111 | bestindex = -1; |
| 112 | for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) { |
| 113 | if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV && |
| 114 | mc13xxx_regulators[reg_id].voltages[i] < bestmatch) { |
| 115 | bestmatch = mc13xxx_regulators[reg_id].voltages[i]; |
| 116 | bestindex = i; |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | if (bestindex < 0 || bestmatch > max_uV) { |
| 121 | dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n", |
| 122 | min_uV, max_uV); |
| 123 | return -EINVAL; |
| 124 | } |
| 125 | return bestindex; |
| 126 | } |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 127 | EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 128 | |
| 129 | static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, |
| 130 | int max_uV, unsigned *selector) |
| 131 | { |
| 132 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 133 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 134 | int value, id = rdev_get_id(rdev); |
| 135 | int ret; |
| 136 | |
| 137 | dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", |
| 138 | __func__, id, min_uV, max_uV); |
| 139 | |
| 140 | /* Find the best index */ |
| 141 | value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV); |
| 142 | dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value); |
| 143 | if (value < 0) |
| 144 | return value; |
| 145 | |
| 146 | mc13xxx_lock(priv->mc13xxx); |
| 147 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, |
| 148 | mc13xxx_regulators[id].vsel_mask, |
| 149 | value << mc13xxx_regulators[id].vsel_shift); |
| 150 | mc13xxx_unlock(priv->mc13xxx); |
| 151 | |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) |
| 156 | { |
| 157 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 158 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 159 | int ret, id = rdev_get_id(rdev); |
| 160 | unsigned int val; |
| 161 | |
| 162 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 163 | |
| 164 | mc13xxx_lock(priv->mc13xxx); |
| 165 | ret = mc13xxx_reg_read(priv->mc13xxx, |
| 166 | mc13xxx_regulators[id].vsel_reg, &val); |
| 167 | mc13xxx_unlock(priv->mc13xxx); |
| 168 | |
| 169 | if (ret) |
| 170 | return ret; |
| 171 | |
| 172 | val = (val & mc13xxx_regulators[id].vsel_mask) |
| 173 | >> mc13xxx_regulators[id].vsel_shift; |
| 174 | |
| 175 | dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); |
| 176 | |
Axel Lin | 3c24019 | 2011-05-18 20:56:45 +0800 | [diff] [blame^] | 177 | BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 178 | |
| 179 | return mc13xxx_regulators[id].voltages[val]; |
| 180 | } |
| 181 | |
| 182 | struct regulator_ops mc13xxx_regulator_ops = { |
| 183 | .enable = mc13xxx_regulator_enable, |
| 184 | .disable = mc13xxx_regulator_disable, |
| 185 | .is_enabled = mc13xxx_regulator_is_enabled, |
| 186 | .list_voltage = mc13xxx_regulator_list_voltage, |
| 187 | .set_voltage = mc13xxx_regulator_set_voltage, |
| 188 | .get_voltage = mc13xxx_regulator_get_voltage, |
| 189 | }; |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 190 | EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 191 | |
| 192 | int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, |
| 193 | int max_uV, unsigned *selector) |
| 194 | { |
| 195 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 196 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 197 | int id = rdev_get_id(rdev); |
| 198 | |
| 199 | dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", |
| 200 | __func__, id, min_uV, max_uV); |
| 201 | |
| 202 | if (min_uV >= mc13xxx_regulators[id].voltages[0] && |
| 203 | max_uV <= mc13xxx_regulators[id].voltages[0]) |
| 204 | return 0; |
| 205 | else |
| 206 | return -EINVAL; |
| 207 | } |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 208 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 209 | |
| 210 | int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev) |
| 211 | { |
| 212 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); |
| 213 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; |
| 214 | int id = rdev_get_id(rdev); |
| 215 | |
| 216 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); |
| 217 | |
| 218 | return mc13xxx_regulators[id].voltages[0]; |
| 219 | } |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 220 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 221 | |
| 222 | struct regulator_ops mc13xxx_fixed_regulator_ops = { |
| 223 | .enable = mc13xxx_regulator_enable, |
| 224 | .disable = mc13xxx_regulator_disable, |
| 225 | .is_enabled = mc13xxx_regulator_is_enabled, |
| 226 | .list_voltage = mc13xxx_regulator_list_voltage, |
| 227 | .set_voltage = mc13xxx_fixed_regulator_set_voltage, |
| 228 | .get_voltage = mc13xxx_fixed_regulator_get_voltage, |
| 229 | }; |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 230 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 231 | |
| 232 | int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev) |
| 233 | { |
| 234 | return 1; |
| 235 | } |
Mark Brown | 4d7071f | 2010-12-15 14:10:25 +0000 | [diff] [blame] | 236 | EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled); |
Yong Shen | 167e3d8 | 2010-12-14 14:00:54 +0800 | [diff] [blame] | 237 | |
| 238 | MODULE_LICENSE("GPL v2"); |
| 239 | MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); |
| 240 | MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); |
| 241 | MODULE_ALIAS("mc13xxx-regulator-core"); |