Krzysztof Kozlowski | 5e9384c | 2018-08-07 18:18:25 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | // |
| 3 | // max14577.c - Regulator driver for the Maxim 14577/77836 |
| 4 | // |
| 5 | // Copyright (C) 2013,2014 Samsung Electronics |
| 6 | // Krzysztof Kozlowski <krzk@kernel.org> |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 7 | |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/regulator/driver.h> |
| 11 | #include <linux/mfd/max14577.h> |
| 12 | #include <linux/mfd/max14577-private.h> |
| 13 | #include <linux/regulator/of_regulator.h> |
| 14 | |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 15 | static int max14577_reg_is_enabled(struct regulator_dev *rdev) |
| 16 | { |
| 17 | int rid = rdev_get_id(rdev); |
| 18 | struct regmap *rmap = rdev->regmap; |
| 19 | u8 reg_data; |
| 20 | |
| 21 | switch (rid) { |
| 22 | case MAX14577_CHARGER: |
| 23 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); |
| 24 | if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) |
| 25 | return 0; |
| 26 | max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); |
| 27 | if ((reg_data & STATUS3_CGMBC_MASK) == 0) |
| 28 | return 0; |
| 29 | /* MBCHOSTEN and CGMBC are on */ |
| 30 | return 1; |
| 31 | default: |
| 32 | return -EINVAL; |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static int max14577_reg_get_current_limit(struct regulator_dev *rdev) |
| 37 | { |
| 38 | u8 reg_data; |
| 39 | struct regmap *rmap = rdev->regmap; |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 40 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
| 41 | const struct maxim_charger_current *limits = |
| 42 | &maxim_charger_currents[max14577->dev_type]; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 43 | |
| 44 | if (rdev_get_id(rdev) != MAX14577_CHARGER) |
| 45 | return -EINVAL; |
| 46 | |
| 47 | max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); |
| 48 | |
| 49 | if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 50 | return limits->min; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 51 | |
| 52 | reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> |
| 53 | CHGCTRL4_MBCICHWRCH_SHIFT); |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 54 | return limits->high_start + reg_data * limits->high_step; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static int max14577_reg_set_current_limit(struct regulator_dev *rdev, |
| 58 | int min_uA, int max_uA) |
| 59 | { |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 60 | u8 reg_data; |
Krzysztof Kozlowski | b8f139f | 2014-09-12 08:53:56 +0200 | [diff] [blame] | 61 | int ret; |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 62 | struct max14577 *max14577 = rdev_get_drvdata(rdev); |
| 63 | const struct maxim_charger_current *limits = |
| 64 | &maxim_charger_currents[max14577->dev_type]; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 65 | |
| 66 | if (rdev_get_id(rdev) != MAX14577_CHARGER) |
| 67 | return -EINVAL; |
| 68 | |
Krzysztof Kozlowski | b8f139f | 2014-09-12 08:53:56 +0200 | [diff] [blame] | 69 | ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); |
| 70 | if (ret) |
| 71 | return ret; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 72 | |
| 73 | return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, |
| 74 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, |
| 75 | reg_data); |
| 76 | } |
| 77 | |
Bhumika Goyal | 18c6c42 | 2017-01-28 19:48:28 +0530 | [diff] [blame] | 78 | static const struct regulator_ops max14577_safeout_ops = { |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 79 | .is_enabled = regulator_is_enabled_regmap, |
| 80 | .enable = regulator_enable_regmap, |
| 81 | .disable = regulator_disable_regmap, |
| 82 | .list_voltage = regulator_list_voltage_linear, |
| 83 | }; |
| 84 | |
Bhumika Goyal | 18c6c42 | 2017-01-28 19:48:28 +0530 | [diff] [blame] | 85 | static const struct regulator_ops max14577_charger_ops = { |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 86 | .is_enabled = max14577_reg_is_enabled, |
| 87 | .enable = regulator_enable_regmap, |
| 88 | .disable = regulator_disable_regmap, |
| 89 | .get_current_limit = max14577_reg_get_current_limit, |
| 90 | .set_current_limit = max14577_reg_set_current_limit, |
| 91 | }; |
| 92 | |
Krzysztof Kozlowski | cab344d | 2015-04-18 20:27:17 +0900 | [diff] [blame] | 93 | #define MAX14577_SAFEOUT_REG { \ |
| 94 | .name = "SAFEOUT", \ |
| 95 | .of_match = of_match_ptr("SAFEOUT"), \ |
| 96 | .regulators_node = of_match_ptr("regulators"), \ |
| 97 | .id = MAX14577_SAFEOUT, \ |
| 98 | .ops = &max14577_safeout_ops, \ |
| 99 | .type = REGULATOR_VOLTAGE, \ |
| 100 | .owner = THIS_MODULE, \ |
| 101 | .n_voltages = 1, \ |
| 102 | .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \ |
| 103 | .enable_reg = MAX14577_REG_CONTROL2, \ |
| 104 | .enable_mask = CTRL2_SFOUTORD_MASK, \ |
| 105 | } |
| 106 | #define MAX14577_CHARGER_REG { \ |
| 107 | .name = "CHARGER", \ |
| 108 | .of_match = of_match_ptr("CHARGER"), \ |
| 109 | .regulators_node = of_match_ptr("regulators"), \ |
| 110 | .id = MAX14577_CHARGER, \ |
| 111 | .ops = &max14577_charger_ops, \ |
| 112 | .type = REGULATOR_CURRENT, \ |
| 113 | .owner = THIS_MODULE, \ |
| 114 | .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, \ |
| 115 | .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, \ |
| 116 | } |
| 117 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 118 | static const struct regulator_desc max14577_supported_regulators[] = { |
Krzysztof Kozlowski | cab344d | 2015-04-18 20:27:17 +0900 | [diff] [blame] | 119 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
| 120 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 121 | }; |
| 122 | |
Bhumika Goyal | 18c6c42 | 2017-01-28 19:48:28 +0530 | [diff] [blame] | 123 | static const struct regulator_ops max77836_ldo_ops = { |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 124 | .is_enabled = regulator_is_enabled_regmap, |
| 125 | .enable = regulator_enable_regmap, |
| 126 | .disable = regulator_disable_regmap, |
| 127 | .list_voltage = regulator_list_voltage_linear, |
| 128 | .map_voltage = regulator_map_voltage_linear, |
| 129 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 130 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 131 | /* TODO: add .set_suspend_mode */ |
| 132 | }; |
| 133 | |
Krzysztof Kozlowski | cab344d | 2015-04-18 20:27:17 +0900 | [diff] [blame] | 134 | #define MAX77836_LDO_REG(num) { \ |
| 135 | .name = "LDO" # num, \ |
| 136 | .of_match = of_match_ptr("LDO" # num), \ |
| 137 | .regulators_node = of_match_ptr("regulators"), \ |
| 138 | .id = MAX77836_LDO ## num, \ |
| 139 | .ops = &max77836_ldo_ops, \ |
| 140 | .type = REGULATOR_VOLTAGE, \ |
| 141 | .owner = THIS_MODULE, \ |
| 142 | .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ |
| 143 | .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ |
| 144 | .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ |
| 145 | .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ |
| 146 | .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ |
| 147 | .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ |
| 148 | .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ |
| 149 | } |
| 150 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 151 | static const struct regulator_desc max77836_supported_regulators[] = { |
Krzysztof Kozlowski | cab344d | 2015-04-18 20:27:17 +0900 | [diff] [blame] | 152 | [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, |
| 153 | [MAX14577_CHARGER] = MAX14577_CHARGER_REG, |
| 154 | [MAX77836_LDO1] = MAX77836_LDO_REG(1), |
| 155 | [MAX77836_LDO2] = MAX77836_LDO_REG(2), |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 156 | }; |
| 157 | |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 158 | #ifdef CONFIG_OF |
| 159 | static struct of_regulator_match max14577_regulator_matches[] = { |
| 160 | { .name = "SAFEOUT", }, |
| 161 | { .name = "CHARGER", }, |
| 162 | }; |
| 163 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 164 | static struct of_regulator_match max77836_regulator_matches[] = { |
| 165 | { .name = "SAFEOUT", }, |
| 166 | { .name = "CHARGER", }, |
| 167 | { .name = "LDO1", }, |
| 168 | { .name = "LDO2", }, |
| 169 | }; |
| 170 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 171 | static inline struct regulator_init_data *match_init_data(int index, |
| 172 | enum maxim_device_type dev_type) |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 173 | { |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 174 | switch (dev_type) { |
| 175 | case MAXIM_DEVICE_TYPE_MAX77836: |
| 176 | return max77836_regulator_matches[index].init_data; |
| 177 | |
| 178 | case MAXIM_DEVICE_TYPE_MAX14577: |
| 179 | default: |
| 180 | return max14577_regulator_matches[index].init_data; |
| 181 | } |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 182 | } |
| 183 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 184 | static inline struct device_node *match_of_node(int index, |
| 185 | enum maxim_device_type dev_type) |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 186 | { |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 187 | switch (dev_type) { |
| 188 | case MAXIM_DEVICE_TYPE_MAX77836: |
| 189 | return max77836_regulator_matches[index].of_node; |
| 190 | |
| 191 | case MAXIM_DEVICE_TYPE_MAX14577: |
| 192 | default: |
| 193 | return max14577_regulator_matches[index].of_node; |
| 194 | } |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 195 | } |
| 196 | #else /* CONFIG_OF */ |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 197 | static inline struct regulator_init_data *match_init_data(int index, |
| 198 | enum maxim_device_type dev_type) |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 199 | { |
| 200 | return NULL; |
| 201 | } |
| 202 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 203 | static inline struct device_node *match_of_node(int index, |
| 204 | enum maxim_device_type dev_type) |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 205 | { |
| 206 | return NULL; |
| 207 | } |
| 208 | #endif /* CONFIG_OF */ |
| 209 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 210 | /** |
| 211 | * Registers for regulators of max77836 use different I2C slave addresses so |
| 212 | * different regmaps must be used for them. |
| 213 | * |
| 214 | * Returns proper regmap for accessing regulator passed by id. |
| 215 | */ |
| 216 | static struct regmap *max14577_get_regmap(struct max14577 *max14577, |
| 217 | int reg_id) |
| 218 | { |
| 219 | switch (max14577->dev_type) { |
| 220 | case MAXIM_DEVICE_TYPE_MAX77836: |
| 221 | switch (reg_id) { |
| 222 | case MAX77836_SAFEOUT ... MAX77836_CHARGER: |
| 223 | return max14577->regmap; |
| 224 | default: |
| 225 | /* MAX77836_LDO1 ... MAX77836_LDO2 */ |
| 226 | return max14577->regmap_pmic; |
| 227 | } |
| 228 | |
| 229 | case MAXIM_DEVICE_TYPE_MAX14577: |
| 230 | default: |
| 231 | return max14577->regmap; |
| 232 | } |
| 233 | } |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 234 | |
| 235 | static int max14577_regulator_probe(struct platform_device *pdev) |
| 236 | { |
| 237 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); |
| 238 | struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); |
Beomho Seo | e951cee | 2014-12-19 18:04:46 +0900 | [diff] [blame] | 239 | int i, ret = 0; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 240 | struct regulator_config config = {}; |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 241 | const struct regulator_desc *supported_regulators; |
| 242 | unsigned int supported_regulators_size; |
| 243 | enum maxim_device_type dev_type = max14577->dev_type; |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 244 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 245 | switch (dev_type) { |
| 246 | case MAXIM_DEVICE_TYPE_MAX77836: |
| 247 | supported_regulators = max77836_supported_regulators; |
| 248 | supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); |
| 249 | break; |
| 250 | case MAXIM_DEVICE_TYPE_MAX14577: |
| 251 | default: |
| 252 | supported_regulators = max14577_supported_regulators; |
| 253 | supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); |
| 254 | } |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 255 | |
Beomho Seo | e951cee | 2014-12-19 18:04:46 +0900 | [diff] [blame] | 256 | config.dev = max14577->dev; |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 257 | config.driver_data = max14577; |
| 258 | |
| 259 | for (i = 0; i < supported_regulators_size; i++) { |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 260 | struct regulator_dev *regulator; |
| 261 | /* |
| 262 | * Index of supported_regulators[] is also the id and must |
| 263 | * match index of pdata->regulators[]. |
| 264 | */ |
| 265 | if (pdata && pdata->regulators) { |
| 266 | config.init_data = pdata->regulators[i].initdata; |
| 267 | config.of_node = pdata->regulators[i].of_node; |
| 268 | } else { |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 269 | config.init_data = match_init_data(i, dev_type); |
| 270 | config.of_node = match_of_node(i, dev_type); |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 271 | } |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 272 | config.regmap = max14577_get_regmap(max14577, |
| 273 | supported_regulators[i].id); |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 274 | |
| 275 | regulator = devm_regulator_register(&pdev->dev, |
| 276 | &supported_regulators[i], &config); |
| 277 | if (IS_ERR(regulator)) { |
| 278 | ret = PTR_ERR(regulator); |
| 279 | dev_err(&pdev->dev, |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 280 | "Regulator init failed for %d/%s with error: %d\n", |
| 281 | i, supported_regulators[i].name, ret); |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 282 | return ret; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | return ret; |
| 287 | } |
| 288 | |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 289 | static const struct platform_device_id max14577_regulator_id[] = { |
| 290 | { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, |
| 291 | { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, |
| 292 | { } |
| 293 | }; |
| 294 | MODULE_DEVICE_TABLE(platform, max14577_regulator_id); |
| 295 | |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 296 | static struct platform_driver max14577_regulator_driver = { |
| 297 | .driver = { |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 298 | .name = "max14577-regulator", |
| 299 | }, |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 300 | .probe = max14577_regulator_probe, |
| 301 | .id_table = max14577_regulator_id, |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 302 | }; |
| 303 | |
| 304 | static int __init max14577_regulator_init(void) |
| 305 | { |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 306 | BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); |
| 307 | BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); |
| 308 | |
| 309 | BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + |
| 310 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * |
| 311 | (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != |
| 312 | MAX77836_REGULATOR_LDO_VOLTAGE_MAX); |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 313 | |
| 314 | return platform_driver_register(&max14577_regulator_driver); |
| 315 | } |
| 316 | subsys_initcall(max14577_regulator_init); |
| 317 | |
| 318 | static void __exit max14577_regulator_exit(void) |
| 319 | { |
| 320 | platform_driver_unregister(&max14577_regulator_driver); |
| 321 | } |
| 322 | module_exit(max14577_regulator_exit); |
| 323 | |
Krzysztof Kozlowski | cea8aa3 | 2016-08-17 14:07:46 +0200 | [diff] [blame] | 324 | MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); |
Krzysztof Kozlowski | 8a82b40 | 2014-04-14 11:17:20 +0200 | [diff] [blame] | 325 | MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); |
Krzysztof Kozlowski | b0902bb | 2013-12-06 12:32:13 +0100 | [diff] [blame] | 326 | MODULE_LICENSE("GPL"); |