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 struct regulator_dev *regulator; 30 struct wm8994 *wm8994; 31 }; 32 33 #define WM8994_LDO1_MAX_SELECTOR 0x7 34 #define WM8994_LDO2_MAX_SELECTOR 0x3 35 36 static struct regulator_ops wm8994_ldo1_ops = { 37 .list_voltage = regulator_list_voltage_linear, 38 .map_voltage = regulator_map_voltage_linear, 39 .get_voltage_sel = regulator_get_voltage_sel_regmap, 40 .set_voltage_sel = regulator_set_voltage_sel_regmap, 41 }; 42 43 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, 44 unsigned int selector) 45 { 46 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 47 48 if (selector > WM8994_LDO2_MAX_SELECTOR) 49 return -EINVAL; 50 51 switch (ldo->wm8994->type) { 52 case WM8994: 53 return (selector * 100000) + 900000; 54 case WM8958: 55 return (selector * 100000) + 1000000; 56 case WM1811: 57 switch (selector) { 58 case 0: 59 return -EINVAL; 60 default: 61 return (selector * 100000) + 950000; 62 } 63 break; 64 default: 65 return -EINVAL; 66 } 67 } 68 69 static struct regulator_ops wm8994_ldo2_ops = { 70 .list_voltage = wm8994_ldo2_list_voltage, 71 .get_voltage_sel = regulator_get_voltage_sel_regmap, 72 .set_voltage_sel = regulator_set_voltage_sel_regmap, 73 }; 74 75 static const struct regulator_desc wm8994_ldo_desc[] = { 76 { 77 .name = "LDO1", 78 .id = 1, 79 .type = REGULATOR_VOLTAGE, 80 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, 81 .vsel_reg = WM8994_LDO_1, 82 .vsel_mask = WM8994_LDO1_VSEL_MASK, 83 .ops = &wm8994_ldo1_ops, 84 .min_uV = 2400000, 85 .uV_step = 100000, 86 .enable_time = 3000, 87 .owner = THIS_MODULE, 88 }, 89 { 90 .name = "LDO2", 91 .id = 2, 92 .type = REGULATOR_VOLTAGE, 93 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 94 .vsel_reg = WM8994_LDO_2, 95 .vsel_mask = WM8994_LDO2_VSEL_MASK, 96 .ops = &wm8994_ldo2_ops, 97 .enable_time = 3000, 98 .owner = THIS_MODULE, 99 }, 100 }; 101 102 static int wm8994_ldo_probe(struct platform_device *pdev) 103 { 104 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 105 struct wm8994_pdata *pdata = wm8994->dev->platform_data; 106 int id = pdev->id % ARRAY_SIZE(pdata->ldo); 107 struct regulator_config config = { }; 108 struct wm8994_ldo *ldo; 109 int ret; 110 111 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 112 113 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); 114 if (ldo == NULL) { 115 dev_err(&pdev->dev, "Unable to allocate private data\n"); 116 return -ENOMEM; 117 } 118 119 ldo->wm8994 = wm8994; 120 121 config.dev = wm8994->dev; 122 config.driver_data = ldo; 123 config.regmap = wm8994->regmap; 124 if (pdata) { 125 config.init_data = pdata->ldo[id].init_data; 126 config.ena_gpio = pdata->ldo[id].enable; 127 } 128 129 ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config); 130 if (IS_ERR(ldo->regulator)) { 131 ret = PTR_ERR(ldo->regulator); 132 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", 133 id + 1, ret); 134 goto err; 135 } 136 137 platform_set_drvdata(pdev, ldo); 138 139 return 0; 140 141 err: 142 return ret; 143 } 144 145 static int wm8994_ldo_remove(struct platform_device *pdev) 146 { 147 struct wm8994_ldo *ldo = platform_get_drvdata(pdev); 148 149 platform_set_drvdata(pdev, NULL); 150 151 regulator_unregister(ldo->regulator); 152 153 return 0; 154 } 155 156 static struct platform_driver wm8994_ldo_driver = { 157 .probe = wm8994_ldo_probe, 158 .remove = wm8994_ldo_remove, 159 .driver = { 160 .name = "wm8994-ldo", 161 .owner = THIS_MODULE, 162 }, 163 }; 164 165 module_platform_driver(wm8994_ldo_driver); 166 167 /* Module information */ 168 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 169 MODULE_DESCRIPTION("WM8994 LDO driver"); 170 MODULE_LICENSE("GPL"); 171 MODULE_ALIAS("platform:wm8994-ldo"); 172