Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Regulators driver for Maxim max8925 |
| 3 | * |
| 4 | * Copyright (C) 2009 Marvell International Ltd. |
| 5 | * Haojian Zhuang <haojian.zhuang@marvell.com> |
| 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 version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #include <linux/kernel.h> |
Paul Gortmaker | 65602c3 | 2011-07-17 16:28:23 -0400 | [diff] [blame] | 12 | #include <linux/module.h> |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 13 | #include <linux/init.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/i2c.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/regulator/driver.h> |
| 18 | #include <linux/regulator/machine.h> |
| 19 | #include <linux/mfd/max8925.h> |
| 20 | |
| 21 | #define SD1_DVM_VMIN 850000 |
| 22 | #define SD1_DVM_VMAX 1000000 |
| 23 | #define SD1_DVM_STEP 50000 |
| 24 | #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ |
| 25 | #define SD1_DVM_EN 6 /* SDV1 bit 6 */ |
| 26 | |
Kevin Liu | 65364e9 | 2012-01-04 15:12:04 +0800 | [diff] [blame] | 27 | /* bit definitions in LDO control registers */ |
| 28 | #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ |
| 29 | #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ |
| 30 | #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ |
| 31 | #define LDO_I2C_EN 0x1 /* Enable by i2c */ |
| 32 | #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ |
| 33 | #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ |
Haojian Zhuang | db13c04 | 2011-04-18 22:04:09 +0800 | [diff] [blame] | 34 | |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 35 | struct max8925_regulator_info { |
| 36 | struct regulator_desc desc; |
| 37 | struct regulator_dev *regulator; |
| 38 | struct i2c_client *i2c; |
| 39 | struct max8925_chip *chip; |
| 40 | |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 41 | int vol_reg; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 42 | int enable_reg; |
| 43 | }; |
| 44 | |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 45 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
| 46 | unsigned int selector) |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 47 | { |
| 48 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 49 | unsigned char mask = rdev->desc->n_voltages - 1; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 50 | |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 51 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 52 | } |
| 53 | |
Axel Lin | 3c8983b | 2012-05-14 10:34:50 +0800 | [diff] [blame] | 54 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 55 | { |
| 56 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 57 | unsigned char data, mask; |
| 58 | int ret; |
| 59 | |
| 60 | ret = max8925_reg_read(info->i2c, info->vol_reg); |
| 61 | if (ret < 0) |
| 62 | return ret; |
Axel Lin | 7f52ba7 | 2012-04-02 09:16:08 +0800 | [diff] [blame] | 63 | mask = rdev->desc->n_voltages - 1; |
| 64 | data = ret & mask; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 65 | |
Axel Lin | 3c8983b | 2012-05-14 10:34:50 +0800 | [diff] [blame] | 66 | return data; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static int max8925_enable(struct regulator_dev *rdev) |
| 70 | { |
| 71 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 72 | |
| 73 | return max8925_set_bits(info->i2c, info->enable_reg, |
Kevin Liu | 65364e9 | 2012-01-04 15:12:04 +0800 | [diff] [blame] | 74 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
| 75 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, |
| 76 | LDO_SEQ_I2C << LDO_SEQ_SHIFT | |
| 77 | LDO_I2C_EN << LDO_I2C_EN_SHIFT); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | static int max8925_disable(struct regulator_dev *rdev) |
| 81 | { |
| 82 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 83 | |
| 84 | return max8925_set_bits(info->i2c, info->enable_reg, |
Kevin Liu | 65364e9 | 2012-01-04 15:12:04 +0800 | [diff] [blame] | 85 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
| 86 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, |
| 87 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static int max8925_is_enabled(struct regulator_dev *rdev) |
| 91 | { |
| 92 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
Kevin Liu | 65364e9 | 2012-01-04 15:12:04 +0800 | [diff] [blame] | 93 | int ldo_seq, ret; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 94 | |
Haojian Zhuang | 4b99fef | 2010-04-06 06:19:15 -0400 | [diff] [blame] | 95 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 96 | if (ret < 0) |
| 97 | return ret; |
Kevin Liu | 65364e9 | 2012-01-04 15:12:04 +0800 | [diff] [blame] | 98 | ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; |
| 99 | if (ldo_seq != LDO_SEQ_I2C) |
| 100 | return 1; |
| 101 | else |
| 102 | return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) |
| 106 | { |
| 107 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 108 | unsigned char data, mask; |
| 109 | |
| 110 | if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) |
| 111 | return -EINVAL; |
| 112 | |
Axel Lin | 5db6d09 | 2012-03-13 16:09:28 +0800 | [diff] [blame] | 113 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 114 | data <<= SD1_DVM_SHIFT; |
| 115 | mask = 3 << SD1_DVM_SHIFT; |
| 116 | |
| 117 | return max8925_set_bits(info->i2c, info->enable_reg, mask, data); |
| 118 | } |
| 119 | |
| 120 | static int max8925_set_dvm_enable(struct regulator_dev *rdev) |
| 121 | { |
| 122 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 123 | |
| 124 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, |
| 125 | 1 << SD1_DVM_EN); |
| 126 | } |
| 127 | |
| 128 | static int max8925_set_dvm_disable(struct regulator_dev *rdev) |
| 129 | { |
| 130 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
| 131 | |
| 132 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); |
| 133 | } |
| 134 | |
| 135 | static struct regulator_ops max8925_regulator_sdv_ops = { |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 136 | .map_voltage = regulator_map_voltage_linear, |
Axel Lin | 4093e73 | 2012-05-14 10:35:40 +0800 | [diff] [blame] | 137 | .list_voltage = regulator_list_voltage_linear, |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 138 | .set_voltage_sel = max8925_set_voltage_sel, |
Axel Lin | 3c8983b | 2012-05-14 10:34:50 +0800 | [diff] [blame] | 139 | .get_voltage_sel = max8925_get_voltage_sel, |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 140 | .enable = max8925_enable, |
| 141 | .disable = max8925_disable, |
| 142 | .is_enabled = max8925_is_enabled, |
| 143 | .set_suspend_voltage = max8925_set_dvm_voltage, |
| 144 | .set_suspend_enable = max8925_set_dvm_enable, |
| 145 | .set_suspend_disable = max8925_set_dvm_disable, |
| 146 | }; |
| 147 | |
| 148 | static struct regulator_ops max8925_regulator_ldo_ops = { |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 149 | .map_voltage = regulator_map_voltage_linear, |
Axel Lin | 4093e73 | 2012-05-14 10:35:40 +0800 | [diff] [blame] | 150 | .list_voltage = regulator_list_voltage_linear, |
Axel Lin | cd8318c | 2012-05-14 10:36:40 +0800 | [diff] [blame] | 151 | .set_voltage_sel = max8925_set_voltage_sel, |
Axel Lin | 3c8983b | 2012-05-14 10:34:50 +0800 | [diff] [blame] | 152 | .get_voltage_sel = max8925_get_voltage_sel, |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 153 | .enable = max8925_enable, |
| 154 | .disable = max8925_disable, |
| 155 | .is_enabled = max8925_is_enabled, |
| 156 | }; |
| 157 | |
| 158 | #define MAX8925_SDV(_id, min, max, step) \ |
| 159 | { \ |
| 160 | .desc = { \ |
| 161 | .name = "SDV" #_id, \ |
| 162 | .ops = &max8925_regulator_sdv_ops, \ |
| 163 | .type = REGULATOR_VOLTAGE, \ |
| 164 | .id = MAX8925_ID_SD##_id, \ |
| 165 | .owner = THIS_MODULE, \ |
Axel Lin | 7f52ba7 | 2012-04-02 09:16:08 +0800 | [diff] [blame] | 166 | .n_voltages = 64, \ |
Axel Lin | 4093e73 | 2012-05-14 10:35:40 +0800 | [diff] [blame] | 167 | .min_uV = min * 1000, \ |
| 168 | .uV_step = step * 1000, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 169 | }, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 170 | .vol_reg = MAX8925_SDV##_id, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 171 | .enable_reg = MAX8925_SDCTL##_id, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | #define MAX8925_LDO(_id, min, max, step) \ |
| 175 | { \ |
| 176 | .desc = { \ |
| 177 | .name = "LDO" #_id, \ |
| 178 | .ops = &max8925_regulator_ldo_ops, \ |
| 179 | .type = REGULATOR_VOLTAGE, \ |
| 180 | .id = MAX8925_ID_LDO##_id, \ |
| 181 | .owner = THIS_MODULE, \ |
Axel Lin | 7f52ba7 | 2012-04-02 09:16:08 +0800 | [diff] [blame] | 182 | .n_voltages = 64, \ |
Axel Lin | 4093e73 | 2012-05-14 10:35:40 +0800 | [diff] [blame] | 183 | .min_uV = min * 1000, \ |
| 184 | .uV_step = step * 1000, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 185 | }, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 186 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 187 | .enable_reg = MAX8925_LDOCTL##_id, \ |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static struct max8925_regulator_info max8925_regulator_info[] = { |
| 191 | MAX8925_SDV(1, 637.5, 1425, 12.5), |
| 192 | MAX8925_SDV(2, 650, 2225, 25), |
| 193 | MAX8925_SDV(3, 750, 3900, 50), |
| 194 | |
| 195 | MAX8925_LDO(1, 750, 3900, 50), |
| 196 | MAX8925_LDO(2, 650, 2250, 25), |
| 197 | MAX8925_LDO(3, 650, 2250, 25), |
| 198 | MAX8925_LDO(4, 750, 3900, 50), |
| 199 | MAX8925_LDO(5, 750, 3900, 50), |
| 200 | MAX8925_LDO(6, 750, 3900, 50), |
| 201 | MAX8925_LDO(7, 750, 3900, 50), |
| 202 | MAX8925_LDO(8, 750, 3900, 50), |
| 203 | MAX8925_LDO(9, 750, 3900, 50), |
| 204 | MAX8925_LDO(10, 750, 3900, 50), |
| 205 | MAX8925_LDO(11, 750, 3900, 50), |
| 206 | MAX8925_LDO(12, 750, 3900, 50), |
| 207 | MAX8925_LDO(13, 750, 3900, 50), |
| 208 | MAX8925_LDO(14, 750, 3900, 50), |
| 209 | MAX8925_LDO(15, 750, 3900, 50), |
| 210 | MAX8925_LDO(16, 750, 3900, 50), |
| 211 | MAX8925_LDO(17, 650, 2250, 25), |
| 212 | MAX8925_LDO(18, 650, 2250, 25), |
| 213 | MAX8925_LDO(19, 750, 3900, 50), |
| 214 | MAX8925_LDO(20, 750, 3900, 50), |
| 215 | }; |
| 216 | |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 217 | static int __devinit max8925_regulator_probe(struct platform_device *pdev) |
| 218 | { |
| 219 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
Haojian Zhuang | 51acdb6 | 2012-09-17 12:19:05 +0800 | [diff] [blame] | 220 | struct regulator_init_data *pdata = pdev->dev.platform_data; |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 221 | struct regulator_config config = { }; |
Dmitry Torokhov | 3fff6c0 | 2010-02-23 23:38:55 -0800 | [diff] [blame] | 222 | struct max8925_regulator_info *ri; |
Haojian Zhuang | 51acdb6 | 2012-09-17 12:19:05 +0800 | [diff] [blame] | 223 | struct resource *res; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 224 | struct regulator_dev *rdev; |
Haojian Zhuang | 51acdb6 | 2012-09-17 12:19:05 +0800 | [diff] [blame] | 225 | int i; |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 226 | |
Haojian Zhuang | 51acdb6 | 2012-09-17 12:19:05 +0800 | [diff] [blame] | 227 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
| 228 | if (!res) { |
| 229 | dev_err(&pdev->dev, "No REG resource!\n"); |
| 230 | return -EINVAL; |
| 231 | } |
| 232 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { |
| 233 | ri = &max8925_regulator_info[i]; |
| 234 | if (ri->vol_reg == res->start) |
| 235 | break; |
| 236 | } |
| 237 | if (i == ARRAY_SIZE(max8925_regulator_info)) { |
| 238 | dev_err(&pdev->dev, "Failed to find regulator %llu\n", |
| 239 | (unsigned long long)res->start); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 240 | return -EINVAL; |
| 241 | } |
| 242 | ri->i2c = chip->i2c; |
| 243 | ri->chip = chip; |
| 244 | |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 245 | config.dev = &pdev->dev; |
Haojian Zhuang | 51acdb6 | 2012-09-17 12:19:05 +0800 | [diff] [blame] | 246 | config.init_data = pdata; |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 247 | config.driver_data = ri; |
| 248 | |
| 249 | rdev = regulator_register(&ri->desc, &config); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 250 | if (IS_ERR(rdev)) { |
| 251 | dev_err(&pdev->dev, "failed to register regulator %s\n", |
| 252 | ri->desc.name); |
| 253 | return PTR_ERR(rdev); |
| 254 | } |
| 255 | |
| 256 | platform_set_drvdata(pdev, rdev); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static int __devexit max8925_regulator_remove(struct platform_device *pdev) |
| 261 | { |
| 262 | struct regulator_dev *rdev = platform_get_drvdata(pdev); |
| 263 | |
Dmitry Torokhov | 3fff6c0 | 2010-02-23 23:38:55 -0800 | [diff] [blame] | 264 | platform_set_drvdata(pdev, NULL); |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 265 | regulator_unregister(rdev); |
Dmitry Torokhov | 3fff6c0 | 2010-02-23 23:38:55 -0800 | [diff] [blame] | 266 | |
Haojian Zhuang | 08ff6f2 | 2010-01-11 13:10:08 +0100 | [diff] [blame] | 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static struct platform_driver max8925_regulator_driver = { |
| 271 | .driver = { |
| 272 | .name = "max8925-regulator", |
| 273 | .owner = THIS_MODULE, |
| 274 | }, |
| 275 | .probe = max8925_regulator_probe, |
| 276 | .remove = __devexit_p(max8925_regulator_remove), |
| 277 | }; |
| 278 | |
| 279 | static int __init max8925_regulator_init(void) |
| 280 | { |
| 281 | return platform_driver_register(&max8925_regulator_driver); |
| 282 | } |
| 283 | subsys_initcall(max8925_regulator_init); |
| 284 | |
| 285 | static void __exit max8925_regulator_exit(void) |
| 286 | { |
| 287 | platform_driver_unregister(&max8925_regulator_driver); |
| 288 | } |
| 289 | module_exit(max8925_regulator_exit); |
| 290 | |
| 291 | MODULE_LICENSE("GPL"); |
| 292 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
| 293 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); |
| 294 | MODULE_ALIAS("platform:max8925-regulator"); |