/* * max1586.c -- Voltage and current regulation for the Maxim 1586 * * Copyright (C) 2008 Robert Jarzmik * * 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; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #define MAX1586_V3_MAX_VSEL 31 #define MAX1586_V6_MAX_VSEL 3 #define MAX1586_V3_MIN_UV 700000 #define MAX1586_V3_MAX_UV 1475000 #define MAX1586_V6_MIN_UV 0 #define MAX1586_V6_MAX_UV 3000000 #define I2C_V3_SELECT (0 << 5) #define I2C_V6_SELECT (1 << 5) struct max1586_data { struct i2c_client *client; /* min/max V3 voltage */ unsigned int min_uV; unsigned int max_uV; unsigned int v3_curr_sel; unsigned int v6_curr_sel; }; /* * V6 voltage * On I2C bus, sending a "x" byte to the max1586 means : * set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3) * As regulator framework doesn't accept voltages to be 0V, we use 1uV. */ static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 }; /* * V3 voltage * On I2C bus, sending a "x" byte to the max1586 means : * set V3 to 0.700V + (x & 0x1f) * 0.025V * This voltage can be increased by external resistors * R24 and R25=100kOhm as described in the data sheet. * The gain is approximately: 1 + R24/R25 + R24/185.5kOhm */ static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev) { struct max1586_data *max1586 = rdev_get_drvdata(rdev); return max1586->v3_curr_sel; } static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct max1586_data *max1586 = rdev_get_drvdata(rdev); struct i2c_client *client = max1586->client; int ret; u8 v3_prog; dev_dbg(&client->dev, "changing voltage v3 to %dmv\n", regulator_list_voltage_linear(rdev, selector) / 1000); v3_prog = I2C_V3_SELECT | (u8) selector; ret = i2c_smbus_write_byte(client, v3_prog); if (ret) return ret; max1586->v3_curr_sel = selector; return 0; } static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev) { struct max1586_data *max1586 = rdev_get_drvdata(rdev); return max1586->v6_curr_sel; } static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev, unsigned int selector) { struct max1586_data *max1586 = rdev_get_drvdata(rdev); struct i2c_client *client = max1586->client; u8 v6_prog; int ret; dev_dbg(&client->dev, "changing voltage v6 to %dmv\n", rdev->desc->volt_table[selector] / 1000); v6_prog = I2C_V6_SELECT | (u8) selector; ret = i2c_smbus_write_byte(client, v6_prog); if (ret) return ret; max1586->v6_curr_sel = selector; return 0; } /* * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back * the set up value. */ static struct regulator_ops max1586_v3_ops = { .get_voltage_sel = max1586_v3_get_voltage_sel, .set_voltage_sel = max1586_v3_set_voltage_sel, .list_voltage = regulator_list_voltage_linear, .map_voltage = regulator_map_voltage_linear, }; static struct regulator_ops max1586_v6_ops = { .get_voltage_sel = max1586_v6_get_voltage_sel, .set_voltage_sel = max1586_v6_set_voltage_sel, .list_voltage = regulator_list_voltage_table, }; static struct regulator_desc max1586_reg[] = { { .name = "Output_V3", .id = MAX1586_V3, .ops = &max1586_v3_ops, .type = REGULATOR_VOLTAGE, .n_voltages = MAX1586_V3_MAX_VSEL + 1, .owner = THIS_MODULE, }, { .name = "Output_V6", .id = MAX1586_V6, .ops = &max1586_v6_ops, .type = REGULATOR_VOLTAGE, .n_voltages = MAX1586_V6_MAX_VSEL + 1, .volt_table = v6_voltages_uv, .owner = THIS_MODULE, }, }; static int of_get_max1586_platform_data(struct device *dev, struct max1586_platform_data *pdata) { struct max1586_subdev_data *sub; struct of_regulator_match rmatch[ARRAY_SIZE(max1586_reg)] = { }; struct device_node *np = dev->of_node; int i, matched; if (of_property_read_u32(np, "v3-gain", &pdata->v3_gain) < 0) { dev_err(dev, "%s has no 'v3-gain' property\n", np->full_name); return -EINVAL; } np = of_get_child_by_name(np, "regulators"); if (!np) { dev_err(dev, "missing 'regulators' subnode in DT\n"); return -EINVAL; } for (i = 0; i < ARRAY_SIZE(rmatch); i++) rmatch[i].name = max1586_reg[i].name; matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch)); of_node_put(np); /* * If matched is 0, ie. neither Output_V3 nor Output_V6 have been found, * return 0, which signals the normal situation where no subregulator is * available. This is normal because the max1586 doesn't provide any * readback support, so the subregulators can't report any status * anyway. If matched < 0, return the error. */ if (matched <= 0) return matched; pdata->subdevs = devm_kzalloc(dev, sizeof(struct max1586_subdev_data) * matched, GFP_KERNEL); if (!pdata->subdevs) return -ENOMEM; pdata->num_subdevs = matched; sub = pdata->subdevs; for (i = 0; i < matched; i++) { sub->id = i; sub->name = rmatch[i].of_node->name; sub->platform_data = rmatch[i].init_data; sub++; } return 0; } static const struct of_device_id max1586_of_match[] = { { .compatible = "maxim,max1586", }, {}, }; MODULE_DEVICE_TABLE(of, max1586_of_match); static int max1586_pmic_probe(struct i2c_client *client, const struct i2c_device_id *i2c_id) { struct max1586_platform_data *pdata, pdata_of; struct regulator_config config = { }; struct max1586_data *max1586; int i, id, ret; const struct of_device_id *match; pdata = dev_get_platdata(&client->dev); if (client->dev.of_node && !pdata) { match = of_match_device(of_match_ptr(max1586_of_match), &client->dev); if (!match) { dev_err(&client->dev, "Error: No device match found\n"); return -ENODEV; } ret = of_get_max1586_platform_data(&client->dev, &pdata_of); if (ret < 0) return ret; pdata = &pdata_of; } max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data), GFP_KERNEL); if (!max1586) return -ENOMEM; max1586->client = client; if (!pdata->v3_gain) return -EINVAL; max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000; max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000; /* Set curr_sel to default voltage on power-up */ max1586->v3_curr_sel = 24; /* 1.3V */ max1586->v6_curr_sel = 0; for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) { struct regulator_dev *rdev; id = pdata->subdevs[i].id; if (!pdata->subdevs[i].platform_data) continue; if (id < MAX1586_V3 || id > MAX1586_V6) { dev_err(&client->dev, "invalid regulator id %d\n", id); return -EINVAL; } if (id == MAX1586_V3) { max1586_reg[id].min_uV = max1586->min_uV; max1586_reg[id].uV_step = (max1586->max_uV - max1586->min_uV) / MAX1586_V3_MAX_VSEL; } config.dev = &client->dev; config.init_data = pdata->subdevs[i].platform_data; config.driver_data = max1586; rdev = devm_regulator_register(&client->dev, &max1586_reg[id], &config); if (IS_ERR(rdev)) { dev_err(&client->dev, "failed to register %s\n", max1586_reg[id].name); return PTR_ERR(rdev); } } i2c_set_clientdata(client, max1586); dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n"); return 0; } static const struct i2c_device_id max1586_id[] = { { "max1586", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, max1586_id); static struct i2c_driver max1586_pmic_driver = { .probe = max1586_pmic_probe, .driver = { .name = "max1586", .owner = THIS_MODULE, .of_match_table = of_match_ptr(max1586_of_match), }, .id_table = max1586_id, }; static int __init max1586_pmic_init(void) { return i2c_add_driver(&max1586_pmic_driver); } subsys_initcall(max1586_pmic_init); static void __exit max1586_pmic_exit(void) { i2c_del_driver(&max1586_pmic_driver); } module_exit(max1586_pmic_exit); /* Module information */ MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver"); MODULE_AUTHOR("Robert Jarzmik"); MODULE_LICENSE("GPL");