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_en_reg; 41 uint8_t en_bit; 42 uint8_t reg_disc_reg; 43 uint8_t disc_bit; 44 uint8_t vout_reg; 45 uint8_t vout_mask; 46 uint8_t deepsleep_reg; 47 48 /* Chip constraints on regulator behavior */ 49 int min_uV; 50 int max_uV; 51 int step_uV; 52 53 /* Regulator specific turn-on delay and voltage settling time*/ 54 int enable_uv_per_us; 55 int change_uv_per_us; 56 57 /* Used by regulator core */ 58 struct regulator_desc desc; 59 }; 60 61 struct rc5t583_regulator { 62 struct rc5t583_regulator_info *reg_info; 63 64 /* Devices */ 65 struct device *dev; 66 struct rc5t583 *mfd; 67 struct regulator_dev *rdev; 68 }; 69 70 static int rc5t583_reg_is_enabled(struct regulator_dev *rdev) 71 { 72 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 73 struct rc5t583_regulator_info *ri = reg->reg_info; 74 uint8_t control; 75 int ret; 76 77 ret = rc5t583_read(reg->mfd->dev, ri->reg_en_reg, &control); 78 if (ret < 0) { 79 dev_err(&rdev->dev, 80 "Error in reading the control register 0x%02x\n", 81 ri->reg_en_reg); 82 return ret; 83 } 84 return !!(control & BIT(ri->en_bit)); 85 } 86 87 static int rc5t583_reg_enable(struct regulator_dev *rdev) 88 { 89 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 90 struct rc5t583_regulator_info *ri = reg->reg_info; 91 int ret; 92 93 ret = rc5t583_set_bits(reg->mfd->dev, ri->reg_en_reg, 94 (1 << ri->en_bit)); 95 if (ret < 0) { 96 dev_err(&rdev->dev, 97 "Error in setting bit of STATE register 0x%02x\n", 98 ri->reg_en_reg); 99 return ret; 100 } 101 return ret; 102 } 103 104 static int rc5t583_reg_disable(struct regulator_dev *rdev) 105 { 106 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 107 struct rc5t583_regulator_info *ri = reg->reg_info; 108 int ret; 109 110 ret = rc5t583_clear_bits(reg->mfd->dev, ri->reg_en_reg, 111 (1 << ri->en_bit)); 112 if (ret < 0) 113 dev_err(&rdev->dev, 114 "Error in clearing bit of STATE register 0x%02x\n", 115 ri->reg_en_reg); 116 117 return ret; 118 } 119 120 static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector) 121 { 122 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 123 struct rc5t583_regulator_info *ri = reg->reg_info; 124 return ri->min_uV + (ri->step_uV * selector); 125 } 126 127 static int rc5t583_set_voltage_sel(struct regulator_dev *rdev, 128 unsigned int selector) 129 { 130 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 131 struct rc5t583_regulator_info *ri = reg->reg_info; 132 int ret; 133 if (selector >= rdev->desc->n_voltages) { 134 dev_err(&rdev->dev, "Invalid selector 0x%02x\n", selector); 135 return -EINVAL; 136 } 137 138 ret = rc5t583_update(reg->mfd->dev, ri->vout_reg, 139 selector, ri->vout_mask); 140 if (ret < 0) 141 dev_err(&rdev->dev, 142 "Error in update voltage register 0x%02x\n", ri->vout_reg); 143 return ret; 144 } 145 146 static int rc5t583_get_voltage_sel(struct regulator_dev *rdev) 147 { 148 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 149 struct rc5t583_regulator_info *ri = reg->reg_info; 150 uint8_t vsel; 151 int ret; 152 ret = rc5t583_read(reg->mfd->dev, ri->vout_reg, &vsel); 153 if (ret < 0) { 154 dev_err(&rdev->dev, 155 "Error in reading voltage register 0x%02x\n", ri->vout_reg); 156 return ret; 157 } 158 return vsel & ri->vout_mask; 159 } 160 161 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev) 162 { 163 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 164 int vsel = rc5t583_get_voltage_sel(rdev); 165 int curr_uV = rc5t583_list_voltage(rdev, vsel); 166 return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us); 167 } 168 169 static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev, 170 unsigned int old_selector, unsigned int new_selector) 171 { 172 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 173 int old_uV, new_uV; 174 old_uV = rc5t583_list_voltage(rdev, old_selector); 175 176 if (old_uV < 0) 177 return old_uV; 178 179 new_uV = rc5t583_list_voltage(rdev, new_selector); 180 if (new_uV < 0) 181 return new_uV; 182 183 return DIV_ROUND_UP(abs(old_uV - new_uV), 184 reg->reg_info->change_uv_per_us); 185 } 186 187 188 static struct regulator_ops rc5t583_ops = { 189 .is_enabled = rc5t583_reg_is_enabled, 190 .enable = rc5t583_reg_enable, 191 .disable = rc5t583_reg_disable, 192 .enable_time = rc5t583_regulator_enable_time, 193 .get_voltage_sel = rc5t583_get_voltage_sel, 194 .set_voltage_sel = rc5t583_set_voltage_sel, 195 .list_voltage = rc5t583_list_voltage, 196 .set_voltage_time_sel = rc5t583_set_voltage_time_sel, 197 }; 198 199 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \ 200 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \ 201 { \ 202 .reg_en_reg = RC5T583_REG_##_en_reg, \ 203 .en_bit = _en_bit, \ 204 .reg_disc_reg = RC5T583_REG_##_disc_reg, \ 205 .disc_bit = _disc_bit, \ 206 .vout_reg = RC5T583_REG_##_id##DAC, \ 207 .vout_mask = _vout_mask, \ 208 .deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \ 209 .min_uV = _min_mv * 1000, \ 210 .max_uV = _max_mv * 1000, \ 211 .step_uV = _step_uV, \ 212 .enable_uv_per_us = _enable_mv * 1000, \ 213 .change_uv_per_us = 40 * 1000, \ 214 .deepsleep_id = RC5T583_DS_##_id, \ 215 .desc = { \ 216 .name = "rc5t583-regulator-"#_id, \ 217 .id = RC5T583_REGULATOR_##_id, \ 218 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \ 219 .ops = &rc5t583_ops, \ 220 .type = REGULATOR_VOLTAGE, \ 221 .owner = THIS_MODULE, \ 222 }, \ 223 } 224 225 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = { 226 RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4), 227 RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14), 228 RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14), 229 RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14), 230 RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160), 231 RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160), 232 RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160), 233 RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160), 234 RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133), 235 RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267), 236 RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133), 237 RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233), 238 RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233), 239 RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133), 240 }; 241 242 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev) 243 { 244 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); 245 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); 246 struct regulator_init_data *reg_data; 247 struct rc5t583_regulator *reg = NULL; 248 struct rc5t583_regulator *regs; 249 struct regulator_dev *rdev; 250 struct rc5t583_regulator_info *ri; 251 int ret; 252 int id; 253 254 if (!pdata) { 255 dev_err(&pdev->dev, "No platform data, exiting...\n"); 256 return -ENODEV; 257 } 258 259 regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX * 260 sizeof(struct rc5t583_regulator), GFP_KERNEL); 261 if (!regs) { 262 dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); 263 return -ENOMEM; 264 } 265 266 267 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) { 268 reg_data = pdata->reg_init_data[id]; 269 270 /* No need to register if there is no regulator data */ 271 if (!reg_data) 272 continue; 273 274 reg = ®s[id]; 275 ri = &rc5t583_reg_info[id]; 276 reg->reg_info = ri; 277 reg->mfd = rc5t583; 278 reg->dev = &pdev->dev; 279 280 if (ri->deepsleep_id == RC5T583_DS_NONE) 281 goto skip_ext_pwr_config; 282 283 ret = rc5t583_ext_power_req_config(rc5t583->dev, 284 ri->deepsleep_id, 285 pdata->regulator_ext_pwr_control[id], 286 pdata->regulator_deepsleep_slot[id]); 287 /* 288 * Configuring external control is not a major issue, 289 * just give warning. 290 */ 291 if (ret < 0) 292 dev_warn(&pdev->dev, 293 "Failed to configure ext control %d\n", id); 294 295 skip_ext_pwr_config: 296 rdev = regulator_register(&ri->desc, &pdev->dev, 297 reg_data, reg, NULL); 298 if (IS_ERR(rdev)) { 299 dev_err(&pdev->dev, "Failed to register regulator %s\n", 300 ri->desc.name); 301 ret = PTR_ERR(rdev); 302 goto clean_exit; 303 } 304 reg->rdev = rdev; 305 } 306 platform_set_drvdata(pdev, regs); 307 return 0; 308 309 clean_exit: 310 while (--id >= 0) 311 regulator_unregister(regs[id].rdev); 312 313 return ret; 314 } 315 316 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev) 317 { 318 struct rc5t583_regulator *regs = platform_get_drvdata(pdev); 319 int id; 320 321 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) 322 regulator_unregister(regs[id].rdev); 323 return 0; 324 } 325 326 static struct platform_driver rc5t583_regulator_driver = { 327 .driver = { 328 .name = "rc5t583-regulator", 329 .owner = THIS_MODULE, 330 }, 331 .probe = rc5t583_regulator_probe, 332 .remove = __devexit_p(rc5t583_regulator_remove), 333 }; 334 335 static int __init rc5t583_regulator_init(void) 336 { 337 return platform_driver_register(&rc5t583_regulator_driver); 338 } 339 subsys_initcall(rc5t583_regulator_init); 340 341 static void __exit rc5t583_regulator_exit(void) 342 { 343 platform_driver_unregister(&rc5t583_regulator_driver); 344 } 345 module_exit(rc5t583_regulator_exit); 346 347 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 348 MODULE_DESCRIPTION("RC5T583 regulator driver"); 349 MODULE_ALIAS("platform:rc5t583-regulator"); 350 MODULE_LICENSE("GPL V2"); 351