c172708d38
Rather than adding new arguments to regulator_register() every time we want to add a new bit of dynamic information at runtime change the function to take these via a struct. By doing this we avoid needing to do further changes like the recent addition of device tree support which required each regulator driver to be updated to take an additional parameter. The regulator_desc which should (mostly) be static data is still passed separately as most drivers are able to configure this statically at build time. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
406 lines
10 KiB
C
406 lines
10 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_is_enabled(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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u16 val;
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val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
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return (val & WM8400_LDO1_ENA) != 0;
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}
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static int wm8400_ldo_enable(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
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WM8400_LDO1_ENA, WM8400_LDO1_ENA);
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}
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static int wm8400_ldo_disable(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
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WM8400_LDO1_ENA, 0);
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}
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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 1600000 + ((selector - 14) * 100000);
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}
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static int wm8400_ldo_get_voltage_sel(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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u16 val;
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val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
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val &= WM8400_LDO1_VSEL_MASK;
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return val;
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}
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static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV, unsigned *selector)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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u16 val;
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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) {
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/* Steps of 50mV from 900mV; */
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val = DIV_ROUND_UP(min_uV - 900000, 50000);
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if ((val * 50000) + 900000 > max_uV)
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return -EINVAL;
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BUG_ON((val * 50000) + 900000 < min_uV);
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} else {
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/* Steps of 100mV from 1700mV */
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val = DIV_ROUND_UP(min_uV - 1700000, 100000);
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if ((val * 100000) + 1700000 > max_uV)
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return -EINVAL;
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BUG_ON((val * 100000) + 1700000 < min_uV);
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val += 0xf;
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}
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*selector = val;
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return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
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WM8400_LDO1_VSEL_MASK, val);
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}
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static struct regulator_ops wm8400_ldo_ops = {
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.is_enabled = wm8400_ldo_is_enabled,
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.enable = wm8400_ldo_enable,
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.disable = wm8400_ldo_disable,
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.list_voltage = wm8400_ldo_list_voltage,
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.get_voltage_sel = wm8400_ldo_get_voltage_sel,
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.set_voltage = wm8400_ldo_set_voltage,
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};
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static int wm8400_dcdc_is_enabled(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 val;
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val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
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return (val & WM8400_DC1_ENA) != 0;
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}
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static int wm8400_dcdc_enable(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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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ENA, WM8400_DC1_ENA);
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}
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static int wm8400_dcdc_disable(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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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_ENA, 0);
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}
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static int wm8400_dcdc_list_voltage(struct regulator_dev *dev,
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unsigned selector)
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{
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if (selector > WM8400_DC1_VSEL_MASK)
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return -EINVAL;
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return 850000 + (selector * 25000);
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}
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static int wm8400_dcdc_get_voltage_sel(struct regulator_dev *dev)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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u16 val;
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
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val &= WM8400_DC1_VSEL_MASK;
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return val;
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}
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static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
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int min_uV, int max_uV, unsigned *selector)
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{
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struct wm8400 *wm8400 = rdev_get_drvdata(dev);
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u16 val;
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int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
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if (min_uV < 850000)
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return -EINVAL;
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val = DIV_ROUND_UP(min_uV - 850000, 25000);
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if (850000 + (25000 * val) > max_uV)
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return -EINVAL;
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BUG_ON(850000 + (25000 * val) < min_uV);
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*selector = val;
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return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
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WM8400_DC1_VSEL_MASK, val);
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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 = wm8400_dcdc_is_enabled,
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.enable = wm8400_dcdc_enable,
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.disable = wm8400_dcdc_disable,
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.list_voltage = wm8400_dcdc_list_voltage,
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.get_voltage_sel = wm8400_dcdc_get_voltage_sel,
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.set_voltage = wm8400_dcdc_set_voltage,
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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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.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
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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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.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
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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 = "LDO3",
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.id = WM8400_LDO3,
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.ops = &wm8400_ldo_ops,
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.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
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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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.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
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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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.n_voltages = WM8400_DC1_VSEL_MASK + 1,
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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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.n_voltages = WM8400_DC2_VSEL_MASK + 1,
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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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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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