|
| 1 | +/* |
| 2 | + * max14577.c - Regulator driver for the Maxim 14577 |
| 3 | + * |
| 4 | + * Copyright (C) 2013 Samsung Electronics |
| 5 | + * Krzysztof Kozlowski <[email protected]> |
| 6 | + * |
| 7 | + * This program is free software; you can redistribute it and/or modify |
| 8 | + * it under the terms of the GNU General Public License as published by |
| 9 | + * the Free Software Foundation; either version 2 of the License, or |
| 10 | + * (at your option) any later version. |
| 11 | + * |
| 12 | + * This program is distributed in the hope that it will be useful, |
| 13 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | + * GNU General Public License for more details. |
| 16 | + */ |
| 17 | + |
| 18 | +#include <linux/module.h> |
| 19 | +#include <linux/platform_device.h> |
| 20 | +#include <linux/regulator/driver.h> |
| 21 | +#include <linux/mfd/max14577.h> |
| 22 | +#include <linux/mfd/max14577-private.h> |
| 23 | +#include <linux/regulator/of_regulator.h> |
| 24 | + |
| 25 | +struct max14577_regulator { |
| 26 | + struct device *dev; |
| 27 | + struct max14577 *max14577; |
| 28 | + struct regulator_dev **regulators; |
| 29 | +}; |
| 30 | + |
| 31 | +static int max14577_reg_is_enabled(struct regulator_dev *rdev) |
| 32 | +{ |
| 33 | + int rid = rdev_get_id(rdev); |
| 34 | + struct regmap *rmap = rdev->regmap; |
| 35 | + u8 reg_data; |
| 36 | + |
| 37 | + switch (rid) { |
| 38 | + case MAX14577_CHARGER: |
| 39 | + max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); |
| 40 | + if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) |
| 41 | + return 0; |
| 42 | + max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); |
| 43 | + if ((reg_data & STATUS3_CGMBC_MASK) == 0) |
| 44 | + return 0; |
| 45 | + /* MBCHOSTEN and CGMBC are on */ |
| 46 | + return 1; |
| 47 | + default: |
| 48 | + return -EINVAL; |
| 49 | + } |
| 50 | +} |
| 51 | + |
| 52 | +static int max14577_reg_get_current_limit(struct regulator_dev *rdev) |
| 53 | +{ |
| 54 | + u8 reg_data; |
| 55 | + struct regmap *rmap = rdev->regmap; |
| 56 | + |
| 57 | + if (rdev_get_id(rdev) != MAX14577_CHARGER) |
| 58 | + return -EINVAL; |
| 59 | + |
| 60 | + max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); |
| 61 | + |
| 62 | + if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) |
| 63 | + return MAX14577_REGULATOR_CURRENT_LIMIT_MIN; |
| 64 | + |
| 65 | + reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> |
| 66 | + CHGCTRL4_MBCICHWRCH_SHIFT); |
| 67 | + return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + |
| 68 | + reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP; |
| 69 | +} |
| 70 | + |
| 71 | +static int max14577_reg_set_current_limit(struct regulator_dev *rdev, |
| 72 | + int min_uA, int max_uA) |
| 73 | +{ |
| 74 | + int i, current_bits = 0xf; |
| 75 | + u8 reg_data; |
| 76 | + |
| 77 | + if (rdev_get_id(rdev) != MAX14577_CHARGER) |
| 78 | + return -EINVAL; |
| 79 | + |
| 80 | + if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX || |
| 81 | + max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN) |
| 82 | + return -EINVAL; |
| 83 | + |
| 84 | + if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) { |
| 85 | + /* Less than 200 mA, so set 90mA (turn only Low Bit off) */ |
| 86 | + u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT; |
| 87 | + return max14577_update_reg(rdev->regmap, |
| 88 | + MAX14577_CHG_REG_CHG_CTRL4, |
| 89 | + CHGCTRL4_MBCICHWRCL_MASK, reg_data); |
| 90 | + } |
| 91 | + |
| 92 | + /* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for |
| 93 | + * valid current starting from LIMIT_MAX. */ |
| 94 | + for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX; |
| 95 | + i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START; |
| 96 | + i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) { |
| 97 | + if (i <= max_uA) |
| 98 | + break; |
| 99 | + current_bits--; |
| 100 | + } |
| 101 | + BUG_ON(current_bits < 0); /* Cannot happen */ |
| 102 | + /* Turn Low Bit on (use range 200mA-950 mA) */ |
| 103 | + reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; |
| 104 | + /* and set proper High Bits */ |
| 105 | + reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; |
| 106 | + |
| 107 | + return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, |
| 108 | + CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, |
| 109 | + reg_data); |
| 110 | +} |
| 111 | + |
| 112 | +static struct regulator_ops max14577_safeout_ops = { |
| 113 | + .is_enabled = regulator_is_enabled_regmap, |
| 114 | + .enable = regulator_enable_regmap, |
| 115 | + .disable = regulator_disable_regmap, |
| 116 | + .list_voltage = regulator_list_voltage_linear, |
| 117 | +}; |
| 118 | + |
| 119 | +static struct regulator_ops max14577_charger_ops = { |
| 120 | + .is_enabled = max14577_reg_is_enabled, |
| 121 | + .enable = regulator_enable_regmap, |
| 122 | + .disable = regulator_disable_regmap, |
| 123 | + .get_current_limit = max14577_reg_get_current_limit, |
| 124 | + .set_current_limit = max14577_reg_set_current_limit, |
| 125 | +}; |
| 126 | + |
| 127 | +static const struct regulator_desc supported_regulators[] = { |
| 128 | + [MAX14577_SAFEOUT] = { |
| 129 | + .name = "SAFEOUT", |
| 130 | + .id = MAX14577_SAFEOUT, |
| 131 | + .ops = &max14577_safeout_ops, |
| 132 | + .type = REGULATOR_VOLTAGE, |
| 133 | + .owner = THIS_MODULE, |
| 134 | + .n_voltages = 1, |
| 135 | + .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, |
| 136 | + .enable_reg = MAX14577_REG_CONTROL2, |
| 137 | + .enable_mask = CTRL2_SFOUTORD_MASK, |
| 138 | + }, |
| 139 | + [MAX14577_CHARGER] = { |
| 140 | + .name = "CHARGER", |
| 141 | + .id = MAX14577_CHARGER, |
| 142 | + .ops = &max14577_charger_ops, |
| 143 | + .type = REGULATOR_CURRENT, |
| 144 | + .owner = THIS_MODULE, |
| 145 | + .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, |
| 146 | + .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, |
| 147 | + }, |
| 148 | +}; |
| 149 | + |
| 150 | +#ifdef CONFIG_OF |
| 151 | +static struct of_regulator_match max14577_regulator_matches[] = { |
| 152 | + { .name = "SAFEOUT", }, |
| 153 | + { .name = "CHARGER", }, |
| 154 | +}; |
| 155 | + |
| 156 | +static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) |
| 157 | +{ |
| 158 | + int ret; |
| 159 | + struct device_node *np; |
| 160 | + |
| 161 | + np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); |
| 162 | + if (!np) { |
| 163 | + dev_err(&pdev->dev, "Failed to get child OF node for regulators\n"); |
| 164 | + return -EINVAL; |
| 165 | + } |
| 166 | + |
| 167 | + ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches, |
| 168 | + MAX14577_REG_MAX); |
| 169 | + if (ret < 0) { |
| 170 | + dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret); |
| 171 | + return ret; |
| 172 | + } |
| 173 | + |
| 174 | + return 0; |
| 175 | +} |
| 176 | + |
| 177 | +static inline struct regulator_init_data *match_init_data(int index) |
| 178 | +{ |
| 179 | + return max14577_regulator_matches[index].init_data; |
| 180 | +} |
| 181 | + |
| 182 | +static inline struct device_node *match_of_node(int index) |
| 183 | +{ |
| 184 | + return max14577_regulator_matches[index].of_node; |
| 185 | +} |
| 186 | +#else /* CONFIG_OF */ |
| 187 | +static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev) |
| 188 | +{ |
| 189 | + return 0; |
| 190 | +} |
| 191 | +static inline struct regulator_init_data *match_init_data(int index) |
| 192 | +{ |
| 193 | + return NULL; |
| 194 | +} |
| 195 | + |
| 196 | +static inline struct device_node *match_of_node(int index) |
| 197 | +{ |
| 198 | + return NULL; |
| 199 | +} |
| 200 | +#endif /* CONFIG_OF */ |
| 201 | + |
| 202 | + |
| 203 | +static int max14577_regulator_probe(struct platform_device *pdev) |
| 204 | +{ |
| 205 | + struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); |
| 206 | + struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); |
| 207 | + int i, ret; |
| 208 | + struct regulator_config config = {}; |
| 209 | + |
| 210 | + ret = max14577_regulator_dt_parse_pdata(pdev); |
| 211 | + if (ret) |
| 212 | + return ret; |
| 213 | + |
| 214 | + config.dev = &pdev->dev; |
| 215 | + config.regmap = max14577->regmap; |
| 216 | + |
| 217 | + for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) { |
| 218 | + struct regulator_dev *regulator; |
| 219 | + /* |
| 220 | + * Index of supported_regulators[] is also the id and must |
| 221 | + * match index of pdata->regulators[]. |
| 222 | + */ |
| 223 | + if (pdata && pdata->regulators) { |
| 224 | + config.init_data = pdata->regulators[i].initdata; |
| 225 | + config.of_node = pdata->regulators[i].of_node; |
| 226 | + } else { |
| 227 | + config.init_data = match_init_data(i); |
| 228 | + config.of_node = match_of_node(i); |
| 229 | + } |
| 230 | + |
| 231 | + regulator = devm_regulator_register(&pdev->dev, |
| 232 | + &supported_regulators[i], &config); |
| 233 | + if (IS_ERR(regulator)) { |
| 234 | + ret = PTR_ERR(regulator); |
| 235 | + dev_err(&pdev->dev, |
| 236 | + "Regulator init failed for ID %d with error: %d\n", |
| 237 | + i, ret); |
| 238 | + return ret; |
| 239 | + } |
| 240 | + } |
| 241 | + |
| 242 | + return ret; |
| 243 | +} |
| 244 | + |
| 245 | +static struct platform_driver max14577_regulator_driver = { |
| 246 | + .driver = { |
| 247 | + .owner = THIS_MODULE, |
| 248 | + .name = "max14577-regulator", |
| 249 | + }, |
| 250 | + .probe = max14577_regulator_probe, |
| 251 | +}; |
| 252 | + |
| 253 | +static int __init max14577_regulator_init(void) |
| 254 | +{ |
| 255 | + BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START + |
| 256 | + MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf != |
| 257 | + MAX14577_REGULATOR_CURRENT_LIMIT_MAX); |
| 258 | + BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX); |
| 259 | + |
| 260 | + return platform_driver_register(&max14577_regulator_driver); |
| 261 | +} |
| 262 | +subsys_initcall(max14577_regulator_init); |
| 263 | + |
| 264 | +static void __exit max14577_regulator_exit(void) |
| 265 | +{ |
| 266 | + platform_driver_unregister(&max14577_regulator_driver); |
| 267 | +} |
| 268 | +module_exit(max14577_regulator_exit); |
| 269 | + |
| 270 | +MODULE_AUTHOR( "Krzysztof Kozlowski <[email protected]>"); |
| 271 | +MODULE_DESCRIPTION("MAXIM 14577 regulator driver"); |
| 272 | +MODULE_LICENSE("GPL"); |
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