1 /* 2 * sky81452-regulator.c SKY81452 regulator driver 3 * 4 * Copyright 2014 Skyworks Solutions Inc. 5 * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2, or (at your option) any 10 * later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include <linux/module.h> 22 #include <linux/kernel.h> 23 #include <linux/platform_device.h> 24 #include <linux/init.h> 25 #include <linux/err.h> 26 #include <linux/of.h> 27 #include <linux/regulator/driver.h> 28 #include <linux/regulator/of_regulator.h> 29 30 /* registers */ 31 #define SKY81452_REG1 0x01 32 #define SKY81452_REG3 0x03 33 34 /* bit mask */ 35 #define SKY81452_LEN 0x40 36 #define SKY81452_LOUT 0x1F 37 38 static struct regulator_ops sky81452_reg_ops = { 39 .list_voltage = regulator_list_voltage_linear_range, 40 .map_voltage = regulator_map_voltage_linear_range, 41 .get_voltage_sel = regulator_get_voltage_sel_regmap, 42 .set_voltage_sel = regulator_set_voltage_sel_regmap, 43 .enable = regulator_enable_regmap, 44 .disable = regulator_disable_regmap, 45 .is_enabled = regulator_is_enabled_regmap, 46 }; 47 48 static const struct regulator_linear_range sky81452_reg_ranges[] = { 49 REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000), 50 REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000), 51 }; 52 53 static const struct regulator_desc sky81452_reg = { 54 .name = "LOUT", 55 .ops = &sky81452_reg_ops, 56 .type = REGULATOR_VOLTAGE, 57 .owner = THIS_MODULE, 58 .n_voltages = SKY81452_LOUT + 1, 59 .linear_ranges = sky81452_reg_ranges, 60 .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges), 61 .vsel_reg = SKY81452_REG3, 62 .vsel_mask = SKY81452_LOUT, 63 .enable_reg = SKY81452_REG1, 64 .enable_mask = SKY81452_LEN, 65 }; 66 67 #ifdef CONFIG_OF 68 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev) 69 { 70 struct regulator_init_data *init_data; 71 struct device_node *np; 72 73 np = of_get_child_by_name(dev->parent->of_node, "regulator"); 74 if (unlikely(!np)) { 75 dev_err(dev, "regulator node not found"); 76 return NULL; 77 } 78 79 init_data = of_get_regulator_init_data(dev, np); 80 81 of_node_put(np); 82 return init_data; 83 } 84 #else 85 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev) 86 { 87 return ERR_PTR(-EINVAL); 88 } 89 #endif 90 91 static int sky81452_reg_probe(struct platform_device *pdev) 92 { 93 struct device *dev = &pdev->dev; 94 const struct regulator_init_data *init_data = dev_get_platdata(dev); 95 struct regulator_config config = { }; 96 struct regulator_dev *rdev; 97 98 if (!init_data) { 99 init_data = sky81452_reg_parse_dt(dev); 100 if (IS_ERR(init_data)) 101 return PTR_ERR(init_data); 102 } 103 104 config.dev = dev; 105 config.init_data = init_data; 106 config.of_node = dev->of_node; 107 config.regmap = dev_get_drvdata(dev->parent); 108 109 rdev = devm_regulator_register(dev, &sky81452_reg, &config); 110 if (IS_ERR(rdev)) 111 return PTR_ERR(rdev); 112 113 platform_set_drvdata(pdev, rdev); 114 115 return 0; 116 } 117 118 static struct platform_driver sky81452_reg_driver = { 119 .driver = { 120 .name = "sky81452-regulator", 121 }, 122 .probe = sky81452_reg_probe, 123 }; 124 125 module_platform_driver(sky81452_reg_driver); 126 127 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver"); 128 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>"); 129 MODULE_LICENSE("GPL"); 130 MODULE_VERSION("1.0"); 131