diff options
| -rw-r--r-- | drivers/regulator/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/regulator/Makefile | 1 | ||||
| -rw-r--r-- | drivers/regulator/wm8400-regulator.c | 368 | ||||
| -rw-r--r-- | include/linux/mfd/wm8400-private.h | 1 | ||||
| -rw-r--r-- | include/linux/mfd/wm8400.h | 40 |
5 files changed, 417 insertions, 0 deletions
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index a656128f1fdd..99906872cb91 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -56,4 +56,11 @@ config REGULATOR_BQ24022 charging select between 100 mA and 500 mA charging current limit. +config REGULATOR_WM8400 + tristate "Wolfson Microelectroncis WM8400 AudioPlus PMIC" + depends on MFD_WM8400 + select REGULATOR + help + This driver provides support for the voltage regulators of the + WM8400 AudioPlus PMIC. endmenu diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index ac2c64efe65c..3c6ac73af152 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -8,5 +8,6 @@ obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o +obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG diff --git a/drivers/regulator/wm8400-regulator.c b/drivers/regulator/wm8400-regulator.c new file mode 100644 index 000000000000..48b372e038a8 --- /dev/null +++ b/drivers/regulator/wm8400-regulator.c @@ -0,0 +1,368 @@ +/* + * Regulator support for WM8400 + * + * Copyright 2008 Wolfson Microelectronics PLC. + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.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; either version 2 of the + * License, or (at your option) any later version. + * + */ + +#include <linux/bug.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/regulator/driver.h> +#include <linux/mfd/wm8400-private.h> + +static int wm8400_ldo_is_enabled(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + u16 val; + + val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); + return (val & WM8400_LDO1_ENA) != 0; +} + +static int wm8400_ldo_enable(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + + return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), + WM8400_LDO1_ENA, WM8400_LDO1_ENA); +} + +static int wm8400_ldo_disable(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + + return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), + WM8400_LDO1_ENA, 0); +} + +static int wm8400_ldo_get_voltage(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + u16 val; + + val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); + val &= WM8400_LDO1_VSEL_MASK; + + if (val < 15) + return 900000 + (val * 50000); + else + return 1600000 + ((val - 14) * 100000); +} + +static int wm8400_ldo_set_voltage(struct regulator_dev *dev, + int min_uV, int max_uV) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + u16 val; + + if (min_uV < 900000 || min_uV > 3300000) + return -EINVAL; + + if (min_uV < 1700000) { + /* Steps of 50mV from 900mV; */ + val = (min_uV - 850001) / 50000; + + if ((val * 50000) + 900000 > max_uV) + return -EINVAL; + BUG_ON((val * 50000) + 900000 < min_uV); + } else { + /* Steps of 100mV from 1700mV */ + val = ((min_uV - 1600001) / 100000); + + if ((val * 100000) + 1700000 > max_uV) + return -EINVAL; + BUG_ON((val * 100000) + 1700000 < min_uV); + + val += 0xf; + } + + return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), + WM8400_LDO1_VSEL_MASK, val); +} + +static struct regulator_ops wm8400_ldo_ops = { + .is_enabled = wm8400_ldo_is_enabled, + .enable = wm8400_ldo_enable, + .disable = wm8400_ldo_disable, + .get_voltage = wm8400_ldo_get_voltage, + .set_voltage = wm8400_ldo_set_voltage, +}; + +static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + u16 val; + + val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); + return (val & WM8400_DC1_ENA) != 0; +} + +static int wm8400_dcdc_enable(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ENA, WM8400_DC1_ENA); +} + +static int wm8400_dcdc_disable(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ENA, 0); +} + +static int wm8400_dcdc_get_voltage(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + u16 val; + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + + val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); + val &= WM8400_DC1_VSEL_MASK; + + return 850000 + (25000 * val); +} + +static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, + int min_uV, int max_uV) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + u16 val; + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + + if (min_uV < 850000) + return -EINVAL; + + val = (min_uV - 825001) / 25000; + + if (850000 + (25000 * val) > max_uV) + return -EINVAL; + BUG_ON(850000 + (25000 * val) < min_uV); + + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_VSEL_MASK, val); +} + +static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + u16 data[2]; + int ret; + + ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, + data); + if (ret != 0) + return 0; + + /* Datasheet: hibernate */ + if (data[0] & WM8400_DC1_SLEEP) + return REGULATOR_MODE_STANDBY; + + /* Datasheet: standby */ + if (!(data[0] & WM8400_DC1_ACTIVE)) + return REGULATOR_MODE_IDLE; + + /* Datasheet: active with or without force PWM */ + if (data[1] & WM8400_DC1_FRC_PWM) + return REGULATOR_MODE_FAST; + else + return REGULATOR_MODE_NORMAL; +} + +static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) +{ + struct wm8400 *wm8400 = rdev_get_drvdata(dev); + int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; + int ret; + + switch (mode) { + case REGULATOR_MODE_FAST: + /* Datasheet: active with force PWM */ + ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, + WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); + if (ret != 0) + return ret; + + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, + WM8400_DC1_ACTIVE); + + case REGULATOR_MODE_NORMAL: + /* Datasheet: active */ + ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, + WM8400_DC1_FRC_PWM, 0); + if (ret != 0) + return ret; + + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, + WM8400_DC1_ACTIVE); + + case REGULATOR_MODE_IDLE: + /* Datasheet: standby */ + ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_ACTIVE, 0); + if (ret != 0) + return ret; + return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, + WM8400_DC1_SLEEP, 0); + + default: + return -EINVAL; + } +} + +static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, + int input_uV, int output_uV, + int load_uA) +{ + return REGULATOR_MODE_NORMAL; +} + +static struct regulator_ops wm8400_dcdc_ops = { + .is_enabled = wm8400_dcdc_is_enabled, + .enable = wm8400_dcdc_enable, + .disable = wm8400_dcdc_disable, + .get_voltage = wm8400_dcdc_get_voltage, + .set_voltage = wm8400_dcdc_set_voltage, + .get_mode = wm8400_dcdc_get_mode, + .set_mode = wm8400_dcdc_set_mode, + .get_optimum_mode = wm8400_dcdc_get_optimum_mode, +}; + +static struct regulator_desc regulators[] = { + { + .name = "LDO1", + .id = WM8400_LDO1, + .ops = &wm8400_ldo_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, + { + .name = "LDO2", + .id = WM8400_LDO2, + .ops = &wm8400_ldo_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, + { + .name = "LDO3", + .id = WM8400_LDO3, + .ops = &wm8400_ldo_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, + { + .name = "LDO4", + .id = WM8400_LDO4, + .ops = &wm8400_ldo_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, + { + .name = "DCDC1", + .id = WM8400_DCDC1, + .ops = &wm8400_dcdc_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, + { + .name = "DCDC2", + .id = WM8400_DCDC2, + .ops = &wm8400_dcdc_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + }, +}; + +static int __init wm8400_regulator_probe(struct platform_device *pdev) +{ + struct regulator_dev *rdev; + + rdev = regulator_register(®ulators[pdev->id], &pdev->dev, + pdev->dev.driver_data); + + if (IS_ERR(rdev)) + return PTR_ERR(rdev); + + return 0; +} + +static int __devexit wm8400_regulator_remove(struct platform_device *pdev) +{ + struct regulator_dev *rdev = platform_get_drvdata(pdev); + + regulator_unregister(rdev); + + return 0; +} + +static struct platform_driver wm8400_regulator_driver = { + .driver = { + .name = "wm8400-regulator", + }, + .probe = wm8400_regulator_probe, + .remove = __devexit_p(wm8400_regulator_remove), +}; + +/** + * wm8400_register_regulator - enable software control of a WM8400 regulator + * + * This function enables software control of a WM8400 regulator via + * the regulator API. It is intended to be called from the + * platform_init() callback of the WM8400 MFD driver. + * + * @param dev The WM8400 device to operate on. + * @param reg The regulator to control. + * @param initdata Regulator initdata for the regulator. + */ +int wm8400_register_regulator(struct device *dev, int reg, + struct regulator_init_data *initdata) +{ + struct wm8400 *wm8400 = dev->driver_data; + + if (wm8400->regulators[reg].name) + return -EBUSY; + + initdata->driver_data = wm8400; + + wm8400->regulators[reg].name = "wm8400-regulator"; + wm8400->regulators[reg].id = reg; + wm8400->regulators[reg].dev.parent = dev; + wm8400->regulators[reg].dev.driver_data = wm8400; + wm8400->regulators[reg].dev.platform_data = initdata; + + return platform_device_register(&wm8400->regulators[reg]); +} +EXPORT_SYMBOL_GPL(wm8400_register_regulator); + +static int __init wm8400_regulator_init(void) +{ + return platform_driver_register(&wm8400_regulator_driver); +} +module_init(wm8400_regulator_init); + +static void __exit wm8400_regulator_exit(void) +{ + platform_driver_unregister(&wm8400_regulator_driver); +} +module_exit(wm8400_regulator_exit); + +MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); +MODULE_DESCRIPTION("WM8400 regulator driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:wm8400-regulator"); diff --git a/include/linux/mfd/wm8400-private.h b/include/linux/mfd/wm8400-private.h index 49042e990f05..2aab4e93a5c9 100644 --- a/include/linux/mfd/wm8400-private.h +++ b/include/linux/mfd/wm8400-private.h @@ -21,6 +21,7 @@ #ifndef __LINUX_MFD_WM8400_PRIV_H #define __LINUX_MFD_WM8400_PRIV_H +#include <linux/mfd/wm8400.h> #include <linux/mutex.h> #include <linux/platform_device.h> diff --git a/include/linux/mfd/wm8400.h b/include/linux/mfd/wm8400.h new file mode 100644 index 000000000000..b46b566ac1ac --- /dev/null +++ b/include/linux/mfd/wm8400.h @@ -0,0 +1,40 @@ +/* + * wm8400 client interface + * + * Copyright 2008 Wolfson Microelectronics plc + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef __LINUX_MFD_WM8400_H +#define __LINUX_MFD_WM8400_H + +#include <linux/regulator/machine.h> + +#define WM8400_LDO1 0 +#define WM8400_LDO2 1 +#define WM8400_LDO3 2 +#define WM8400_LDO4 3 +#define WM8400_DCDC1 4 +#define WM8400_DCDC2 5 + +struct wm8400_platform_data { + int (*platform_init)(struct device *dev); +}; + +int wm8400_register_regulator(struct device *dev, int reg, + struct regulator_init_data *initdata); + +#endif |
