Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | /* * isl6271a-regulator.c * * Support for Intersil ISL6271A voltage regulator * * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, * whether express or implied; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/i2c.h> #include <linux/slab.h> #define ISL6271A_VOLTAGE_MIN 850000 #define ISL6271A_VOLTAGE_MAX 1600000 #define ISL6271A_VOLTAGE_STEP 50000 /* PMIC details */ struct isl_pmic { struct i2c_client *client; struct regulator_dev *rdev[3]; struct mutex mtx; }; static int isl6271a_get_voltage_sel(struct regulator_dev *dev) { struct isl_pmic *pmic = rdev_get_drvdata(dev); int idx; mutex_lock(&pmic->mtx); idx = i2c_smbus_read_byte(pmic->client); if (idx < 0) dev_err(&pmic->client->dev, "Error getting voltage\n"); mutex_unlock(&pmic->mtx); return idx; } static int isl6271a_set_voltage_sel(struct regulator_dev *dev, unsigned selector) { struct isl_pmic *pmic = rdev_get_drvdata(dev); int err; mutex_lock(&pmic->mtx); err = i2c_smbus_write_byte(pmic->client, selector); if (err < 0) dev_err(&pmic->client->dev, "Error setting voltage\n"); mutex_unlock(&pmic->mtx); return err; } static struct regulator_ops isl_core_ops = { .get_voltage_sel = isl6271a_get_voltage_sel, .set_voltage_sel = isl6271a_set_voltage_sel, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, }; static struct regulator_ops isl_fixed_ops = { .list_voltage = regulator_list_voltage_linear, }; static const struct regulator_desc isl_rd[] = { { .name = "Core Buck", .id = 0, .n_voltages = 16, .ops = &isl_core_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, .min_uV = ISL6271A_VOLTAGE_MIN, .uV_step = ISL6271A_VOLTAGE_STEP, }, { .name = "LDO1", .id = 1, .n_voltages = 1, .ops = &isl_fixed_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, .min_uV = 1100000, }, { .name = "LDO2", .id = 2, .n_voltages = 1, .ops = &isl_fixed_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, .min_uV = 1300000, }, }; static int isl6271a_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct regulator_config config = { }; struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev); struct isl_pmic *pmic; int i; if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -EIO; pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL); if (!pmic) return -ENOMEM; pmic->client = i2c; mutex_init(&pmic->mtx); for (i = 0; i < 3; i++) { config.dev = &i2c->dev; if (i == 0) config.init_data = init_data; else config.init_data = NULL; config.driver_data = pmic; pmic->rdev[i] = devm_regulator_register(&i2c->dev, &isl_rd[i], &config); if (IS_ERR(pmic->rdev[i])) { dev_err(&i2c->dev, "failed to register %s\n", id->name); return PTR_ERR(pmic->rdev[i]); } } i2c_set_clientdata(i2c, pmic); return 0; } static const struct i2c_device_id isl6271a_id[] = { {.name = "isl6271a", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, isl6271a_id); static struct i2c_driver isl6271a_i2c_driver = { .driver = { .name = "isl6271a", }, .probe = isl6271a_probe, .id_table = isl6271a_id, }; static int __init isl6271a_init(void) { return i2c_add_driver(&isl6271a_i2c_driver); } static void __exit isl6271a_cleanup(void) { i2c_del_driver(&isl6271a_i2c_driver); } subsys_initcall(isl6271a_init); module_exit(isl6271a_cleanup); MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver"); MODULE_LICENSE("GPL v2"); |