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/init.h> 27 #include <linux/slab.h> 28 #include <linux/err.h> 29 #include <linux/platform_device.h> 30 #include <linux/regulator/driver.h> 31 #include <linux/regulator/machine.h> 32 #include <linux/gpio.h> 33 #include <linux/mfd/rc5t583.h> 34 35 struct rc5t583_regulator_info { 36 int deepsleep_id; 37 38 /* Regulator register address.*/ 39 uint8_t reg_disc_reg; 40 uint8_t disc_bit; 41 uint8_t deepsleep_reg; 42 43 /* Regulator specific turn-on delay and voltage settling time*/ 44 int enable_uv_per_us; 45 46 /* Used by regulator core */ 47 struct regulator_desc desc; 48 }; 49 50 struct rc5t583_regulator { 51 struct rc5t583_regulator_info *reg_info; 52 53 /* Devices */ 54 struct device *dev; 55 struct rc5t583 *mfd; 56 struct regulator_dev *rdev; 57 }; 58 59 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev) 60 { 61 struct rc5t583_regulator *reg = rdev_get_drvdata(rdev); 62 int vsel = regulator_get_voltage_sel_regmap(rdev); 63 int curr_uV = regulator_list_voltage_linear(rdev, vsel); 64 65 return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us); 66 } 67 68 static struct regulator_ops rc5t583_ops = { 69 .is_enabled = regulator_is_enabled_regmap, 70 .enable = regulator_enable_regmap, 71 .disable = regulator_disable_regmap, 72 .enable_time = rc5t583_regulator_enable_time, 73 .get_voltage_sel = regulator_get_voltage_sel_regmap, 74 .set_voltage_sel = regulator_set_voltage_sel_regmap, 75 .list_voltage = regulator_list_voltage_linear, 76 .map_voltage = regulator_map_voltage_linear, 77 .set_voltage_time_sel = regulator_set_voltage_time_sel, 78 }; 79 80 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \ 81 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \ 82 { \ 83 .reg_disc_reg = RC5T583_REG_##_disc_reg, \ 84 .disc_bit = _disc_bit, \ 85 .deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \ 86 .enable_uv_per_us = _enable_mv * 1000, \ 87 .deepsleep_id = RC5T583_DS_##_id, \ 88 .desc = { \ 89 .name = "rc5t583-regulator-"#_id, \ 90 .id = RC5T583_REGULATOR_##_id, \ 91 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \ 92 .ops = &rc5t583_ops, \ 93 .type = REGULATOR_VOLTAGE, \ 94 .owner = THIS_MODULE, \ 95 .vsel_reg = RC5T583_REG_##_id##DAC, \ 96 .vsel_mask = _vout_mask, \ 97 .enable_reg = RC5T583_REG_##_en_reg, \ 98 .enable_mask = BIT(_en_bit), \ 99 .min_uV = _min_mv * 1000, \ 100 .uV_step = _step_uV, \ 101 .ramp_delay = 40 * 1000, \ 102 }, \ 103 } 104 105 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = { 106 RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4), 107 RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14), 108 RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14), 109 RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14), 110 RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160), 111 RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160), 112 RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160), 113 RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160), 114 RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133), 115 RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267), 116 RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133), 117 RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233), 118 RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233), 119 RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133), 120 }; 121 122 static int rc5t583_regulator_probe(struct platform_device *pdev) 123 { 124 struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); 125 struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); 126 struct regulator_init_data *reg_data; 127 struct regulator_config config = { }; 128 struct rc5t583_regulator *reg = NULL; 129 struct rc5t583_regulator *regs; 130 struct regulator_dev *rdev; 131 struct rc5t583_regulator_info *ri; 132 int ret; 133 int id; 134 135 if (!pdata) { 136 dev_err(&pdev->dev, "No platform data, exiting...\n"); 137 return -ENODEV; 138 } 139 140 regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX * 141 sizeof(struct rc5t583_regulator), GFP_KERNEL); 142 if (!regs) { 143 dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); 144 return -ENOMEM; 145 } 146 147 148 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) { 149 reg_data = pdata->reg_init_data[id]; 150 151 /* No need to register if there is no regulator data */ 152 if (!reg_data) 153 continue; 154 155 reg = ®s[id]; 156 ri = &rc5t583_reg_info[id]; 157 reg->reg_info = ri; 158 reg->mfd = rc5t583; 159 reg->dev = &pdev->dev; 160 161 if (ri->deepsleep_id == RC5T583_DS_NONE) 162 goto skip_ext_pwr_config; 163 164 ret = rc5t583_ext_power_req_config(rc5t583->dev, 165 ri->deepsleep_id, 166 pdata->regulator_ext_pwr_control[id], 167 pdata->regulator_deepsleep_slot[id]); 168 /* 169 * Configuring external control is not a major issue, 170 * just give warning. 171 */ 172 if (ret < 0) 173 dev_warn(&pdev->dev, 174 "Failed to configure ext control %d\n", id); 175 176 skip_ext_pwr_config: 177 config.dev = &pdev->dev; 178 config.init_data = reg_data; 179 config.driver_data = reg; 180 config.regmap = rc5t583->regmap; 181 182 rdev = regulator_register(&ri->desc, &config); 183 if (IS_ERR(rdev)) { 184 dev_err(&pdev->dev, "Failed to register regulator %s\n", 185 ri->desc.name); 186 ret = PTR_ERR(rdev); 187 goto clean_exit; 188 } 189 reg->rdev = rdev; 190 } 191 platform_set_drvdata(pdev, regs); 192 return 0; 193 194 clean_exit: 195 while (--id >= 0) 196 regulator_unregister(regs[id].rdev); 197 198 return ret; 199 } 200 201 static int rc5t583_regulator_remove(struct platform_device *pdev) 202 { 203 struct rc5t583_regulator *regs = platform_get_drvdata(pdev); 204 int id; 205 206 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) 207 regulator_unregister(regs[id].rdev); 208 return 0; 209 } 210 211 static struct platform_driver rc5t583_regulator_driver = { 212 .driver = { 213 .name = "rc5t583-regulator", 214 .owner = THIS_MODULE, 215 }, 216 .probe = rc5t583_regulator_probe, 217 .remove = rc5t583_regulator_remove, 218 }; 219 220 static int __init rc5t583_regulator_init(void) 221 { 222 return platform_driver_register(&rc5t583_regulator_driver); 223 } 224 subsys_initcall(rc5t583_regulator_init); 225 226 static void __exit rc5t583_regulator_exit(void) 227 { 228 platform_driver_unregister(&rc5t583_regulator_driver); 229 } 230 module_exit(rc5t583_regulator_exit); 231 232 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 233 MODULE_DESCRIPTION("RC5T583 regulator driver"); 234 MODULE_ALIAS("platform:rc5t583-regulator"); 235 MODULE_LICENSE("GPL v2"); 236