1 /* 2 * Regulator driver for RICOH RC5T583 power management chip. 3 * 4 * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved. 5 * Author: Laxman dewangan <ldewangan@nvidia.com> 6 * 7 * based on code 8 * Copyright (C) 2011 RICOH COMPANY,LTD 9 * 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms and conditions of the GNU General Public License, 13 * version 2, as published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope it will be useful, but WITHOUT 16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 18 * more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program. If not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 25 #include <linux/module.h> 26 #include <linux/delay.h> 27 #include <linux/init.h> 28 #include <linux/slab.h> 29 #include <linux/err.h> 30 #include <linux/platform_device.h> 31 #include <linux/regulator/driver.h> 32 #include <linux/regulator/machine.h> 33 #include <linux/gpio.h> 34 #include <linux/mfd/rc5t583.h> 35 36 struct rc5t583_regulator_info { 37 int deepsleep_id; 38 39 /* Regulator register address.*/ 40 uint8_t reg_disc_reg; 41 uint8_t disc_bit; 42 uint8_t deepsleep_reg; 43 44 /* Chip constraints on regulator behavior */ 45 int min_uV; 46 int max_uV; 47 int step_uV; 48 49 /* Regulator specific turn-on delay and voltage settling time*/ 50 int enable_uv_per_us; 51 int change_uv_per_us; 52 53 /* Used by regulator core */ 54 struct regulator_desc desc; 55 }; 56 57 struct rc5t583_regulator { 58 struct rc5t583_regulator_info *reg_info; 59 60 /* Devices */ 61 struct device *dev; 62 struct rc5t583 *mfd; 63 struct regulator_dev *rdev; 64 }; 65 66 static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector) 67 { 68 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 69 struct rc5t583_regulator_info *ri = reg->reg_info; 70 return ri->min_uV + (ri->step_uV * selector); 71 } 72 73 static int rc5t583_set_voltage(struct regulator_dev *rdev, 74 int min_uV, int max_uV, unsigned *selector) 75 { 76 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 77 struct rc5t583_regulator_info *ri = reg->reg_info; 78 int sel, ret; 79 80 if (min_uV < ri->min_uV) 81 min_uV = ri->min_uV; 82 83 sel = DIV_ROUND_UP(min_uV - ri->min_uV, ri->step_uV); 84 85 if (sel >= rdev->desc->n_voltages) { 86 dev_err(&rdev->dev, "Invalid selector 0x%02x\n", sel); 87 return -EINVAL; 88 } 89 90 *selector = sel; 91 92 ret = rc5t583_update(reg->mfd->dev, rdev->desc->vsel_reg, sel, 93 rdev->desc->vsel_mask); 94 if (ret < 0) 95 dev_err(&rdev->dev, "Error in update voltage register 0x%02x\n", 96 rdev->desc->vsel_reg); 97 return ret; 98 } 99 100 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev) 101 { 102 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 103 int vsel = regulator_get_voltage_sel_regmap(rdev); 104 int curr_uV = rc5t583_list_voltage(rdev, vsel); 105 106 return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us); 107 } 108 109 static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev, 110 unsigned int old_selector, unsigned int new_selector) 111 { 112 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 113 int old_uV, new_uV; 114 old_uV = rc5t583_list_voltage(rdev, old_selector); 115 116 if (old_uV < 0) 117 return old_uV; 118 119 new_uV = rc5t583_list_voltage(rdev, new_selector); 120 if (new_uV < 0) 121 return new_uV; 122 123 return DIV_ROUND_UP(abs(old_uV - new_uV), 124 reg->reg_info->change_uv_per_us); 125 } 126 127 128 static struct regulator_ops rc5t583_ops = { 129 .is_enabled = regulator_is_enabled_regmap, 130 .enable = regulator_enable_regmap, 131 .disable = regulator_disable_regmap, 132 .enable_time = rc5t583_regulator_enable_time, 133 .get_voltage_sel = regulator_get_voltage_sel_regmap, 134 .set_voltage = rc5t583_set_voltage, 135 .list_voltage = rc5t583_list_voltage, 136 .set_voltage_time_sel = rc5t583_set_voltage_time_sel, 137 }; 138 139 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \ 140 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \ 141 { \ 142 .reg_disc_reg = RC5T583_REG_##_disc_reg, \ 143 .disc_bit = _disc_bit, \ 144 .deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \ 145 .min_uV = _min_mv * 1000, \ 146 .max_uV = _max_mv * 1000, \ 147 .step_uV = _step_uV, \ 148 .enable_uv_per_us = _enable_mv * 1000, \ 149 .change_uv_per_us = 40 * 1000, \ 150 .deepsleep_id = RC5T583_DS_##_id, \ 151 .desc = { \ 152 .name = "rc5t583-regulator-"#_id, \ 153 .id = RC5T583_REGULATOR_##_id, \ 154 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \ 155 .ops = &rc5t583_ops, \ 156 .type = REGULATOR_VOLTAGE, \ 157 .owner = THIS_MODULE, \ 158 .vsel_reg = RC5T583_REG_##_id##DAC, \ 159 .vsel_mask = _vout_mask, \ 160 .enable_reg = RC5T583_REG_##_en_reg, \ 161 .enable_mask = BIT(_en_bit), \ 162 }, \ 163 } 164 165 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = { 166 RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4), 167 RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14), 168 RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14), 169 RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14), 170 RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160), 171 RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160), 172 RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160), 173 RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160), 174 RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133), 175 RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267), 176 RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133), 177 RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233), 178 RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233), 179 RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133), 180 }; 181 182 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev) 183 { 184 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); 185 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); 186 struct regulator_init_data *reg_data; 187 struct regulator_config config = { }; 188 struct rc5t583_regulator *reg = NULL; 189 struct rc5t583_regulator *regs; 190 struct regulator_dev *rdev; 191 struct rc5t583_regulator_info *ri; 192 int ret; 193 int id; 194 195 if (!pdata) { 196 dev_err(&pdev->dev, "No platform data, exiting...\n"); 197 return -ENODEV; 198 } 199 200 regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX * 201 sizeof(struct rc5t583_regulator), GFP_KERNEL); 202 if (!regs) { 203 dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); 204 return -ENOMEM; 205 } 206 207 208 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) { 209 reg_data = pdata->reg_init_data[id]; 210 211 /* No need to register if there is no regulator data */ 212 if (!reg_data) 213 continue; 214 215 reg = ®s[id]; 216 ri = &rc5t583_reg_info[id]; 217 reg->reg_info = ri; 218 reg->mfd = rc5t583; 219 reg->dev = &pdev->dev; 220 221 if (ri->deepsleep_id == RC5T583_DS_NONE) 222 goto skip_ext_pwr_config; 223 224 ret = rc5t583_ext_power_req_config(rc5t583->dev, 225 ri->deepsleep_id, 226 pdata->regulator_ext_pwr_control[id], 227 pdata->regulator_deepsleep_slot[id]); 228 /* 229 * Configuring external control is not a major issue, 230 * just give warning. 231 */ 232 if (ret < 0) 233 dev_warn(&pdev->dev, 234 "Failed to configure ext control %d\n", id); 235 236 skip_ext_pwr_config: 237 config.dev = &pdev->dev; 238 config.init_data = reg_data; 239 config.driver_data = reg; 240 config.regmap = rc5t583->regmap; 241 242 rdev = regulator_register(&ri->desc, &config); 243 if (IS_ERR(rdev)) { 244 dev_err(&pdev->dev, "Failed to register regulator %s\n", 245 ri->desc.name); 246 ret = PTR_ERR(rdev); 247 goto clean_exit; 248 } 249 reg->rdev = rdev; 250 } 251 platform_set_drvdata(pdev, regs); 252 return 0; 253 254 clean_exit: 255 while (--id >= 0) 256 regulator_unregister(regs[id].rdev); 257 258 return ret; 259 } 260 261 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev) 262 { 263 struct rc5t583_regulator *regs = platform_get_drvdata(pdev); 264 int id; 265 266 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) 267 regulator_unregister(regs[id].rdev); 268 return 0; 269 } 270 271 static struct platform_driver rc5t583_regulator_driver = { 272 .driver = { 273 .name = "rc5t583-regulator", 274 .owner = THIS_MODULE, 275 }, 276 .probe = rc5t583_regulator_probe, 277 .remove = __devexit_p(rc5t583_regulator_remove), 278 }; 279 280 static int __init rc5t583_regulator_init(void) 281 { 282 return platform_driver_register(&rc5t583_regulator_driver); 283 } 284 subsys_initcall(rc5t583_regulator_init); 285 286 static void __exit rc5t583_regulator_exit(void) 287 { 288 platform_driver_unregister(&rc5t583_regulator_driver); 289 } 290 module_exit(rc5t583_regulator_exit); 291 292 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 293 MODULE_DESCRIPTION("RC5T583 regulator driver"); 294 MODULE_ALIAS("platform:rc5t583-regulator"); 295 MODULE_LICENSE("GPL v2"); 296