Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx> --- drivers/regulator/Kconfig | 7 + drivers/regulator/Makefile | 1 + drivers/regulator/act8865-regulator.c | 516 +++++++++++++++++++++++++++++++++ include/linux/regulator/act8865.h | 56 ++++ 4 files changed, 580 insertions(+) create mode 100644 drivers/regulator/act8865-regulator.c create mode 100644 include/linux/regulator/act8865.h diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index ce785f4..e13bcf1 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -577,5 +577,12 @@ config REGULATOR_WM8994 This driver provides support for the voltage regulators on the WM8994 CODEC. +config REGULATOR_ACT8865 + tristate "Active-semi act8865 voltage regulator" + depends on I2C + help + This driver controls a active-semi act8865 voltage output + regulator via I2C bus. + endif diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 01c597e..8bc485f 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -78,6 +78,7 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o +obj-$(CONFIG_REGULATOR_ACT8865) += act8865-regulator.o ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c new file mode 100644 index 0000000..d616a28 --- /dev/null +++ b/drivers/regulator/act8865-regulator.c @@ -0,0 +1,516 @@ +/* + * act8865-regulator.c - Voltage regulation for the active-semi ACT8865 + * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf + * + * Copyright (C) 2013 Atmel Corporation + * Wenyou Yang <wenyou.yang@xxxxxxxxx> + * + * 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. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/act8865.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/regulator/of_regulator.h> + +/* + * ACT8865 Global Register Map + */ +#define ACT8865_SYS_MODE 0x00 +#define ACT8865_SYS_CTRL 0x01 +#define ACT8865_REG1_VSET1 0x20 +#define ACT8865_REG1_VSET2 0x21 +#define ACT8865_REG1_CTRL 0x22 +#define ACT8865_REG2_VSET1 0x30 +#define ACT8865_REG2_VSET2 0x31 +#define ACT8865_REG2_CTRL 0x32 +#define ACT8865_REG3_VSET1 0x40 +#define ACT8865_REG3_VSET2 0x41 +#define ACT8865_REG3_CTRL 0x42 +#define ACT8865_REG4_VSET 0x50 +#define ACT8865_REG4_CTRL 0x51 +#define ACT8865_REG5_VSET 0x54 +#define ACT8865_REG5_CTRL 0x55 +#define ACT8865_REG6_VSET 0x60 +#define ACT8865_REG6_CTRL 0x61 +#define ACT8865_REG7_VSET 0x64 +#define ACT8865_REG7_CTRL 0x65 + +struct act8865_data { + u8 vsel_is_low:1; + struct i2c_client *client; + struct regulator_dev *rdev[]; +}; + +/* ACt8865 voltage table */ +static const u32 act8865_voltages_table[] = { + 600000, 625000, 650000, 675000, + 700000, 725000, 750000, 775000, + 800000, 825000, 850000, 875000, + 900000, 925000, 950000, 975000, + 1000000, 1025000, 1050000, 1075000, + 1100000, 1125000, 1150000, 1175000, + 1200000, 1250000, 1300000, 1350000, + 1400000, 1450000, 1500000, 1550000, + 1600000, 1650000, 1700000, 1750000, + 1800000, 1850000, 1900000, 1950000, + 2000000, 2050000, 2010000, 2150000, + 2200000, 2250000, 2300000, 2350000, + 2400000, 2500000, 2600000, 2700000, + 2800000, 2900000, 3000000, 3100000, + 3200000, 3300000, 3400000, 3500000, + 3600000, 3700000, 3800000, 3900000, +}; + +static int act8865_read_reg(struct act8865_data *act8865, u8 reg) +{ + int ret = i2c_smbus_read_byte_data(act8865->client, reg); + if (ret > 0) + ret &= 0xff; + + return ret; +} + +static int act8865_write_reg(struct act8865_data *act8865, u8 reg, u8 value) +{ + return i2c_smbus_write_byte_data(act8865->client, reg, value); +} + +/* + * operation functions + */ + +static u32 act8865_ctrl_reg_addr(int id) +{ + u32 reg = 0; + + switch (id) { + case ACT8865_ID_REG1: + reg = ACT8865_REG1_CTRL; + break; + + case ACT8865_ID_REG2: + reg = ACT8865_REG2_CTRL; + break; + + case ACT8865_ID_REG3: + reg = ACT8865_REG3_CTRL; + break; + + case ACT8865_ID_REG4: + reg = ACT8865_REG4_CTRL; + break; + + case ACT8865_ID_REG5: + reg = ACT8865_REG5_CTRL; + break; + + case ACT8865_ID_REG6: + reg = ACT8865_REG6_CTRL; + break; + + case ACT8865_ID_REG7: + reg = ACT8865_REG7_CTRL; + break; + }; + + return reg; +} + +static u32 act8865_vset_reg_addr(struct act8865_data *act8865, int id) +{ + u32 reg = 0; + + switch (id) { + case ACT8865_ID_REG1: + if (act8865->vsel_is_low) + reg = ACT8865_REG1_VSET1; + else + reg = ACT8865_REG1_VSET2; + break; + + case ACT8865_ID_REG2: + if (act8865->vsel_is_low) + reg = ACT8865_REG2_VSET1; + else + reg = ACT8865_REG2_VSET2; + break; + + case ACT8865_ID_REG3: + if (act8865->vsel_is_low) + reg = ACT8865_REG3_VSET1; + else + reg = ACT8865_REG3_VSET2; + break; + + case ACT8865_ID_REG4: + reg = ACT8865_REG4_VSET; + break; + + case ACT8865_ID_REG5: + reg = ACT8865_REG5_VSET; + break; + + case ACT8865_ID_REG6: + reg = ACT8865_REG6_VSET; + break; + + case ACT8865_ID_REG7: + reg = ACT8865_REG7_VSET; + break; + }; + + return reg; +} + +static int act88665_is_enabled(struct regulator_dev *rdev) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg; + u8 mask = 0x80; + + reg = act8865_ctrl_reg_addr(id); + + return (act8865_read_reg(act8865, reg) & mask) == mask; +} + +static int act8865_enable(struct regulator_dev *rdev) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg; + u8 val; + u8 mask = 0x80; + + reg = act8865_ctrl_reg_addr(id); + val = act8865_read_reg(act8865, reg); + val |= mask; + + return act8865_write_reg(act8865, reg, val); +} + +static int act8865_disable(struct regulator_dev *rdev) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg; + u8 val; + u8 mask = 0x80; + + reg = act8865_ctrl_reg_addr(id); + val = act8865_read_reg(act8865, reg); + val &= ~mask; + + return act8865_write_reg(act8865, reg, val); +} + +static int act8865_get_voltage_sel(struct regulator_dev *rdev) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg = act8865_vset_reg_addr(act8865, id); + + return act8865_read_reg(act8865, reg); +} + +static int act8865_set_voltage_sel(struct regulator_dev *rdev, u32 selector) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg = act8865_vset_reg_addr(act8865, id); + + return act8865_write_reg(act8865, reg, selector); +} + +static int act8865_set_suspend_voltage(struct regulator_dev *rdev, int uV) +{ + struct act8865_data *act8865 = rdev_get_drvdata(rdev); + int id = rdev_get_id(rdev); + u32 reg = act8865_vset_reg_addr(act8865, id); + u32 selector; + + pr_info("%s: suspend voltage %dmV\n", rdev->desc->name, uV / 1000); + + selector = regulator_map_voltage_iterate(rdev, uV, uV); + + return act8865_write_reg(act8865, reg, selector); +} + +static struct regulator_ops act8865_ops = { + .list_voltage = regulator_list_voltage_table, + .set_voltage_sel = act8865_set_voltage_sel, + .get_voltage_sel = act8865_get_voltage_sel, + .enable = act8865_enable, + .disable = act8865_disable, + .is_enabled = act88665_is_enabled, + .set_suspend_voltage = act8865_set_suspend_voltage, + .set_suspend_enable = act8865_enable, + .set_suspend_disable = act8865_disable, +}; + +static const struct regulator_desc act8865_reg[] = { + { + .name = "DCDC_REG1", + .id = ACT8865_ID_REG1, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "DCDC_REG2", + .id = ACT8865_ID_REG2, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "DCDC_REG3", + .id = ACT8865_ID_REG3, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG4", + .id = ACT8865_ID_REG4, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG5", + .id = ACT8865_ID_REG5, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG6", + .id = ACT8865_ID_REG6, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, + { + .name = "LDO_REG7", + .id = ACT8865_ID_REG7, + .ops = &act8865_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ARRAY_SIZE(act8865_voltages_table), + .volt_table = act8865_voltages_table, + .owner = THIS_MODULE, + }, +}; + +#ifdef CONFIG_OF +static const struct of_device_id act8865_dt_ids[] = { + { .compatible = "active-semi,act8865" }, + { } +}; +MODULE_DEVICE_TABLE(of, act8865_dt_ids); + +static int act8865_pdata_from_dt(struct device *dev, + struct device_node **of_node, + struct act8865_platform_data *pdata) +{ + int matched, i; + struct device_node *np; + struct act8865_regulator_data *regulator; + struct of_regulator_match rmatch[ARRAY_SIZE(act8865_reg)]; + + if (of_find_property(dev->of_node, "vsel-state-low", NULL)) + pdata->vsel_is_low = 1; + + np = of_find_node_by_name(dev->of_node, "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 = act8865_reg[i].name; + + matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch)); + if (matched <= 0) + return matched; + + pdata->regulators = devm_kzalloc(dev, + sizeof(struct act8865_regulator_data) * matched, + GFP_KERNEL); + if (!pdata->regulators) { + dev_err(dev, "%s: failed to allocate act8865 registor\n", + __func__); + return -ENOMEM; + } + + pdata->num_regulators = matched; + regulator = pdata->regulators; + + for (i = 0; i < matched; i++) { + regulator->id = i; + regulator->name = rmatch[i].name; + regulator->platform_data = rmatch[i].init_data; + of_node[i] = rmatch[i].of_node; + regulator++; + } + + return 0; +} + +#else + +static inline int act8865_pdata_from_dt(struct device *dev, + struct device_node **of_node, + struct act8865_platform_data *pdata) +{ + return 0; +} +#endif + +static int act8865_pmu_probe(struct i2c_client *client, + const struct i2c_device_id *i2c_id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct regulator_dev **rdev; + struct device *dev = &client->dev; + struct act8865_platform_data *pdata = dev_get_platdata(dev); + struct regulator_config config = { }; + struct act8865_data *act8865; + int i, id; + int ret = -EINVAL; + struct device_node *of_node[ACT8865_REG_NUM]; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) + return -EIO; + + if (dev->of_node && !pdata) { + const struct of_device_id *id; + struct act8865_platform_data pdata_of; + + id = of_match_device(of_match_ptr(act8865_dt_ids), dev); + if (!id) + return -ENODEV; + + ret = act8865_pdata_from_dt(dev, of_node, &pdata_of); + if (ret < 0) + return ret; + + pdata = &pdata_of; + } else { + memset(of_node, 0, sizeof(of_node)); + } + + if (pdata->num_regulators > ACT8865_REG_NUM) { + dev_err(dev, "Too many regulators found!\n"); + return -EINVAL; + } + + act8865 = devm_kzalloc(dev, sizeof(struct act8865_data) + + sizeof(struct regulator_dev *) * ACT8865_REG_NUM, + GFP_KERNEL); + if (!act8865) + return -ENOMEM; + + act8865->client = client; + act8865->vsel_is_low = pdata->vsel_is_low; + rdev = act8865->rdev; + + /* Finally register devices */ + for (i = 0; i < pdata->num_regulators; i++) { + + id = pdata->regulators[i].id; + + config.dev = dev; + config.init_data = pdata->regulators[i].platform_data; + config.of_node = of_node[i]; + config.driver_data = act8865; + + rdev[i] = regulator_register(&act8865_reg[id], &config); + if (IS_ERR(rdev[i])) { + ret = PTR_ERR(rdev[i]); + dev_err(dev, "failed to register %s\n", + act8865_reg[id].name); + goto err_unregister; + } + } + + i2c_set_clientdata(client, act8865); + + return 0; + +err_unregister: + while (--i >= 0) + regulator_unregister(rdev[i]); + + return ret; +} + +static int act8865_pmu_remove(struct i2c_client *client) +{ + struct act8865_data *act8865 = i2c_get_clientdata(client); + int i; + + for (i = 0; i < ACT8865_REG_NUM; i++) + regulator_unregister(act8865->rdev[i]); + + return 0; +} + +static const struct i2c_device_id act8865_ids[] = { + { "act8865", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, act8865_ids); + +static struct i2c_driver act8865_pmu_driver = { + .probe = act8865_pmu_probe, + .remove = act8865_pmu_remove, + .driver = { + .name = "act8865", + .owner = THIS_MODULE, + }, + .id_table = act8865_ids, +}; + +static int __init act8865_pmu_init(void) +{ + return i2c_add_driver(&act8865_pmu_driver); +} +subsys_initcall(act8865_pmu_init); + +static void __exit act8865_pmu_exit(void) +{ + i2c_del_driver(&act8865_pmu_driver); +} +module_exit(act8865_pmu_exit); + +MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver"); +MODULE_AUTHOR("Wenyou Yang <wenyou.yang@xxxxxxxxx>"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/regulator/act8865.h b/include/linux/regulator/act8865.h new file mode 100644 index 0000000..202544f --- /dev/null +++ b/include/linux/regulator/act8865.h @@ -0,0 +1,56 @@ +/* + * act8865.h -- Voltage regulation for the active-semi act8865 + * + * Copyright (C) 2013 Atmel Corporation. + * + * 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 of the License. + * + * 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. + */ + +#ifndef __LINUX_REGULATOR_ACT8865_H +#define __LINUX_REGULATOR_ACT8865_H + +#include <linux/regulator/machine.h> + +enum { + ACT8865_ID_REG1, + ACT8865_ID_REG2, + ACT8865_ID_REG3, + ACT8865_ID_REG4, + ACT8865_ID_REG5, + ACT8865_ID_REG6, + ACT8865_ID_REG7, + ACT8865_REG_NUM, +}; + +/** + * act8865_regulator_data - regulator data + * @id: regulator id + * @name: regulator name + * @platform_data: regulator init data + */ +struct act8865_regulator_data { + int id; + const char *name; + struct regulator_init_data *platform_data; +}; + +/** + * act8865_platform_data - platform data for act8865 + * @num_regulators: number of regulators used + * @regulators: pointer to regulators used + * @vsel_is_low: VSEL pin, drive to logic low to select default output voltage, + * drive to logic high to select secondary output voltage. + */ +struct act8865_platform_data { + int num_regulators; + struct act8865_regulator_data *regulators; + unsigned vsel_is_low:1; +}; +#endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
