74e20e5691
Adjust the equation for selector >= 15 for better readability. The equation "1700000 + ((selector - 15) * 100000)" can be interpreted by: Starting from selector 15: Steps of 100mV from 1700mV Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/*
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* Regulator support for WM8400
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*
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* Copyright 2008 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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*/
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/wm8400-private.h>
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static int wm8400_ldo_list_voltage(struct regulator_dev *dev,
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unsigned selector)
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{
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if (selector > WM8400_LDO1_VSEL_MASK)
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return -EINVAL;
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if (selector < 15)
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return 900000 + (selector * 50000);
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else
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return 1700000 + ((selector - 15) * 100000);
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}
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static int wm8400_ldo_map_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV)
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{
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u16 val;
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int volt;
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if (min_uV < 900000 || min_uV > 3300000)
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return -EINVAL;
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if (min_uV < 1700000) /* Steps of 50mV from 900mV; */
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val = DIV_ROUND_UP(min_uV - 900000, 50000);
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else /* Steps of 100mV from 1700mV */
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val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15;
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volt = wm8400_ldo_list_voltage(dev, val);
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if (volt < min_uV || volt > max_uV)
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return -EINVAL;
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return val;
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}
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static struct regulator_ops wm8400_ldo_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.list_voltage = wm8400_ldo_list_voltage,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.map_voltage = wm8400_ldo_map_voltage,
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};
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static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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u16 data[2];
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int ret;
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ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
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data);
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if (ret != 0)
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return 0;
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/* Datasheet: hibernate */
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if (data[0] & WM8400_DC1_SLEEP)
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return REGULATOR_MODE_STANDBY;
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/* Datasheet: standby */
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if (!(data[0] & WM8400_DC1_ACTIVE))
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return REGULATOR_MODE_IDLE;
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/* Datasheet: active with or without force PWM */
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if (data[1] & WM8400_DC1_FRC_PWM)
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return REGULATOR_MODE_FAST;
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else
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return REGULATOR_MODE_NORMAL;
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}
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static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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int ret;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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/* Datasheet: active with force PWM */
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ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
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WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
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if (ret != 0)
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return ret;
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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
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WM8400_DC1_ACTIVE);
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case REGULATOR_MODE_NORMAL:
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/* Datasheet: active */
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ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
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WM8400_DC1_FRC_PWM, 0);
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if (ret != 0)
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return ret;
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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
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WM8400_DC1_ACTIVE);
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case REGULATOR_MODE_IDLE:
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/* Datasheet: standby */
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ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ACTIVE, 0);
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if (ret != 0)
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return ret;
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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_SLEEP, 0);
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default:
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return -EINVAL;
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}
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}
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static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
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int input_uV, int output_uV,
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int load_uA)
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{
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return REGULATOR_MODE_NORMAL;
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}
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static struct regulator_ops wm8400_dcdc_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_mode = wm8400_dcdc_get_mode,
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.set_mode = wm8400_dcdc_set_mode,
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.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
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};
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static struct regulator_desc regulators[] = {
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{
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.name = "LDO1",
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.id = WM8400_LDO1,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO1_CONTROL,
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.enable_mask = WM8400_LDO1_ENA,
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.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
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.vsel_reg = WM8400_LDO1_CONTROL,
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.vsel_mask = WM8400_LDO1_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO2",
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.id = WM8400_LDO2,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO2_CONTROL,
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.enable_mask = WM8400_LDO2_ENA,
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.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
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.type = REGULATOR_VOLTAGE,
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.vsel_reg = WM8400_LDO2_CONTROL,
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.vsel_mask = WM8400_LDO2_VSEL_MASK,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO3",
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.id = WM8400_LDO3,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO3_CONTROL,
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.enable_mask = WM8400_LDO3_ENA,
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.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
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.vsel_reg = WM8400_LDO3_CONTROL,
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.vsel_mask = WM8400_LDO3_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO4",
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.id = WM8400_LDO4,
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.ops = &wm8400_ldo_ops,
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.enable_reg = WM8400_LDO4_CONTROL,
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.enable_mask = WM8400_LDO4_ENA,
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.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
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.vsel_reg = WM8400_LDO4_CONTROL,
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.vsel_mask = WM8400_LDO4_VSEL_MASK,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "DCDC1",
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.id = WM8400_DCDC1,
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.ops = &wm8400_dcdc_ops,
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.enable_reg = WM8400_DCDC1_CONTROL_1,
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.enable_mask = WM8400_DC1_ENA_MASK,
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.n_voltages = WM8400_DC1_VSEL_MASK + 1,
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.vsel_reg = WM8400_DCDC1_CONTROL_1,
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.vsel_mask = WM8400_DC1_VSEL_MASK,
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.min_uV = 850000,
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.uV_step = 25000,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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{
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.name = "DCDC2",
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.id = WM8400_DCDC2,
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.ops = &wm8400_dcdc_ops,
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.enable_reg = WM8400_DCDC2_CONTROL_1,
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.enable_mask = WM8400_DC1_ENA_MASK,
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.n_voltages = WM8400_DC2_VSEL_MASK + 1,
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.vsel_reg = WM8400_DCDC2_CONTROL_1,
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.vsel_mask = WM8400_DC2_VSEL_MASK,
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.min_uV = 850000,
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.uV_step = 25000,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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},
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};
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static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
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{
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struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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config.dev = &pdev->dev;
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config.init_data = pdev->dev.platform_data;
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config.driver_data = wm8400;
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config.regmap = wm8400->regmap;
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rdev = regulator_register(®ulators[pdev->id], &config);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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platform_set_drvdata(pdev, rdev);
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return 0;
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}
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static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
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{
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struct regulator_dev *rdev = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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regulator_unregister(rdev);
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return 0;
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}
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static struct platform_driver wm8400_regulator_driver = {
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.driver = {
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.name = "wm8400-regulator",
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},
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.probe = wm8400_regulator_probe,
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.remove = __devexit_p(wm8400_regulator_remove),
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};
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/**
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* wm8400_register_regulator - enable software control of a WM8400 regulator
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*
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* This function enables software control of a WM8400 regulator via
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* the regulator API. It is intended to be called from the
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* platform_init() callback of the WM8400 MFD driver.
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*
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* @param dev The WM8400 device to operate on.
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* @param reg The regulator to control.
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* @param initdata Regulator initdata for the regulator.
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*/
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int wm8400_register_regulator(struct device *dev, int reg,
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struct regulator_init_data *initdata)
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{
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struct wm8400 *wm8400 = dev_get_drvdata(dev);
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if (wm8400->regulators[reg].name)
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return -EBUSY;
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initdata->driver_data = wm8400;
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wm8400->regulators[reg].name = "wm8400-regulator";
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wm8400->regulators[reg].id = reg;
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wm8400->regulators[reg].dev.parent = dev;
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wm8400->regulators[reg].dev.platform_data = initdata;
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return platform_device_register(&wm8400->regulators[reg]);
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}
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EXPORT_SYMBOL_GPL(wm8400_register_regulator);
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static int __init wm8400_regulator_init(void)
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{
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return platform_driver_register(&wm8400_regulator_driver);
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}
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subsys_initcall(wm8400_regulator_init);
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static void __exit wm8400_regulator_exit(void)
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{
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platform_driver_unregister(&wm8400_regulator_driver);
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}
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module_exit(wm8400_regulator_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM8400 regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8400-regulator");
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