1 /* 2 * wm8994-regulator.c -- Regulator driver for the WM8994 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/platform_device.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/gpio.h> 22 #include <linux/slab.h> 23 24 #include <linux/mfd/wm8994/core.h> 25 #include <linux/mfd/wm8994/registers.h> 26 #include <linux/mfd/wm8994/pdata.h> 27 28 struct wm8994_ldo { 29 int enable; 30 bool is_enabled; 31 struct regulator_dev *regulator; 32 struct wm8994 *wm8994; 33 }; 34 35 #define WM8994_LDO1_MAX_SELECTOR 0x7 36 #define WM8994_LDO2_MAX_SELECTOR 0x3 37 38 static int wm8994_ldo_enable(struct regulator_dev *rdev) 39 { 40 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 41 42 /* If we have no soft control assume that the LDO is always enabled. */ 43 if (!ldo->enable) 44 return 0; 45 46 gpio_set_value_cansleep(ldo->enable, 1); 47 ldo->is_enabled = true; 48 49 return 0; 50 } 51 52 static int wm8994_ldo_disable(struct regulator_dev *rdev) 53 { 54 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 55 56 /* If we have no soft control assume that the LDO is always enabled. */ 57 if (!ldo->enable) 58 return -EINVAL; 59 60 gpio_set_value_cansleep(ldo->enable, 0); 61 ldo->is_enabled = false; 62 63 return 0; 64 } 65 66 static int wm8994_ldo_is_enabled(struct regulator_dev *rdev) 67 { 68 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 69 70 return ldo->is_enabled; 71 } 72 73 static int wm8994_ldo_enable_time(struct regulator_dev *rdev) 74 { 75 /* 3ms is fairly conservative but this shouldn't be too performance 76 * critical; can be tweaked per-system if required. */ 77 return 3000; 78 } 79 80 static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev, 81 unsigned int selector) 82 { 83 if (selector > WM8994_LDO1_MAX_SELECTOR) 84 return -EINVAL; 85 86 return (selector * 100000) + 2400000; 87 } 88 89 static struct regulator_ops wm8994_ldo1_ops = { 90 .enable = wm8994_ldo_enable, 91 .disable = wm8994_ldo_disable, 92 .is_enabled = wm8994_ldo_is_enabled, 93 .enable_time = wm8994_ldo_enable_time, 94 95 .list_voltage = wm8994_ldo1_list_voltage, 96 .get_voltage_sel = regulator_get_voltage_sel_regmap, 97 .set_voltage_sel = regulator_set_voltage_sel_regmap, 98 }; 99 100 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, 101 unsigned int selector) 102 { 103 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 104 105 if (selector > WM8994_LDO2_MAX_SELECTOR) 106 return -EINVAL; 107 108 switch (ldo->wm8994->type) { 109 case WM8994: 110 return (selector * 100000) + 900000; 111 case WM8958: 112 return (selector * 100000) + 1000000; 113 case WM1811: 114 switch (selector) { 115 case 0: 116 return -EINVAL; 117 default: 118 return (selector * 100000) + 950000; 119 } 120 break; 121 default: 122 return -EINVAL; 123 } 124 } 125 126 static struct regulator_ops wm8994_ldo2_ops = { 127 .enable = wm8994_ldo_enable, 128 .disable = wm8994_ldo_disable, 129 .is_enabled = wm8994_ldo_is_enabled, 130 .enable_time = wm8994_ldo_enable_time, 131 132 .list_voltage = wm8994_ldo2_list_voltage, 133 .get_voltage_sel = regulator_get_voltage_sel_regmap, 134 .set_voltage_sel = regulator_set_voltage_sel_regmap, 135 }; 136 137 static const struct regulator_desc wm8994_ldo_desc[] = { 138 { 139 .name = "LDO1", 140 .id = 1, 141 .type = REGULATOR_VOLTAGE, 142 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, 143 .vsel_reg = WM8994_LDO_1, 144 .vsel_mask = WM8994_LDO1_VSEL_MASK, 145 .ops = &wm8994_ldo1_ops, 146 .owner = THIS_MODULE, 147 }, 148 { 149 .name = "LDO2", 150 .id = 2, 151 .type = REGULATOR_VOLTAGE, 152 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 153 .vsel_reg = WM8994_LDO_2, 154 .vsel_mask = WM8994_LDO2_VSEL_MASK, 155 .ops = &wm8994_ldo2_ops, 156 .owner = THIS_MODULE, 157 }, 158 }; 159 160 static __devinit int wm8994_ldo_probe(struct platform_device *pdev) 161 { 162 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 163 struct wm8994_pdata *pdata = wm8994->dev->platform_data; 164 int id = pdev->id % ARRAY_SIZE(pdata->ldo); 165 struct regulator_config config = { }; 166 struct wm8994_ldo *ldo; 167 int ret; 168 169 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 170 171 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); 172 if (ldo == NULL) { 173 dev_err(&pdev->dev, "Unable to allocate private data\n"); 174 return -ENOMEM; 175 } 176 177 ldo->wm8994 = wm8994; 178 179 if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) { 180 ldo->enable = pdata->ldo[id].enable; 181 182 ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable"); 183 if (ret < 0) { 184 dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", 185 ret); 186 goto err; 187 } 188 } else 189 ldo->is_enabled = true; 190 191 config.dev = wm8994->dev; 192 config.driver_data = ldo; 193 config.regmap = wm8994->regmap; 194 if (pdata) 195 config.init_data = pdata->ldo[id].init_data; 196 197 ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config); 198 if (IS_ERR(ldo->regulator)) { 199 ret = PTR_ERR(ldo->regulator); 200 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", 201 id + 1, ret); 202 goto err_gpio; 203 } 204 205 platform_set_drvdata(pdev, ldo); 206 207 return 0; 208 209 err_gpio: 210 if (gpio_is_valid(ldo->enable)) 211 gpio_free(ldo->enable); 212 err: 213 return ret; 214 } 215 216 static __devexit int wm8994_ldo_remove(struct platform_device *pdev) 217 { 218 struct wm8994_ldo *ldo = platform_get_drvdata(pdev); 219 220 platform_set_drvdata(pdev, NULL); 221 222 regulator_unregister(ldo->regulator); 223 if (gpio_is_valid(ldo->enable)) 224 gpio_free(ldo->enable); 225 226 return 0; 227 } 228 229 static struct platform_driver wm8994_ldo_driver = { 230 .probe = wm8994_ldo_probe, 231 .remove = __devexit_p(wm8994_ldo_remove), 232 .driver = { 233 .name = "wm8994-ldo", 234 .owner = THIS_MODULE, 235 }, 236 }; 237 238 static int __init wm8994_ldo_init(void) 239 { 240 int ret; 241 242 ret = platform_driver_register(&wm8994_ldo_driver); 243 if (ret != 0) 244 pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret); 245 246 return ret; 247 } 248 subsys_initcall(wm8994_ldo_init); 249 250 static void __exit wm8994_ldo_exit(void) 251 { 252 platform_driver_unregister(&wm8994_ldo_driver); 253 } 254 module_exit(wm8994_ldo_exit); 255 256 /* Module information */ 257 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 258 MODULE_DESCRIPTION("WM8994 LDO driver"); 259 MODULE_LICENSE("GPL"); 260 MODULE_ALIAS("platform:wm8994-ldo"); 261