e4ee831f94
The WM831x series of devices all have 3 DC-DC buck convertors. This driver implements software control for these regulators via the regulator API. Use with split hardware/software control of individual regulators is not supported, though regulators not controlled by software may be controlled via the hardware control interfaces. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
644 lines
16 KiB
C
644 lines
16 KiB
C
/*
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* wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series
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*
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* Copyright 2009 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 modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/regulator.h>
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#include <linux/mfd/wm831x/pdata.h>
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#define WM831X_BUCKV_MAX_SELECTOR 0x68
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#define WM831X_BUCKP_MAX_SELECTOR 0x66
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#define WM831X_DCDC_MODE_FAST 0
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#define WM831X_DCDC_MODE_NORMAL 1
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#define WM831X_DCDC_MODE_IDLE 2
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#define WM831X_DCDC_MODE_STANDBY 3
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#define WM831X_DCDC_MAX_NAME 6
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/* Register offsets in control block */
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#define WM831X_DCDC_CONTROL_1 0
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#define WM831X_DCDC_CONTROL_2 1
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#define WM831X_DCDC_ON_CONFIG 2
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#define WM831X_DCDC_SLEEP_CONTROL 3
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/*
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* Shared
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*/
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struct wm831x_dcdc {
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char name[WM831X_DCDC_MAX_NAME];
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struct regulator_desc desc;
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int base;
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struct wm831x *wm831x;
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struct regulator_dev *regulator;
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};
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static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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int mask = 1 << rdev_get_id(rdev);
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int reg;
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reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
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if (reg < 0)
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return reg;
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if (reg & mask)
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return 1;
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else
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return 0;
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}
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static int wm831x_dcdc_enable(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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int mask = 1 << rdev_get_id(rdev);
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return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
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}
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static int wm831x_dcdc_disable(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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int mask = 1 << rdev_get_id(rdev);
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return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
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}
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static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
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int val;
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val = wm831x_reg_read(wm831x, reg);
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if (val < 0)
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return val;
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val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
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switch (val) {
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case WM831X_DCDC_MODE_FAST:
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return REGULATOR_MODE_FAST;
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case WM831X_DCDC_MODE_NORMAL:
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return REGULATOR_MODE_NORMAL;
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case WM831X_DCDC_MODE_STANDBY:
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return REGULATOR_MODE_STANDBY;
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case WM831X_DCDC_MODE_IDLE:
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return REGULATOR_MODE_IDLE;
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default:
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BUG();
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}
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}
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static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
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unsigned int mode)
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{
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int val;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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val = WM831X_DCDC_MODE_FAST;
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break;
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case REGULATOR_MODE_NORMAL:
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val = WM831X_DCDC_MODE_NORMAL;
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break;
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case REGULATOR_MODE_STANDBY:
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val = WM831X_DCDC_MODE_STANDBY;
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break;
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case REGULATOR_MODE_IDLE:
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val = WM831X_DCDC_MODE_IDLE;
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break;
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default:
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return -EINVAL;
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}
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return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
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val << WM831X_DC1_ON_MODE_SHIFT);
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}
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static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
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return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
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}
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static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
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unsigned int mode)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
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return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
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}
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static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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int ret;
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/* First, check for errors */
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ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
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if (ret < 0)
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return ret;
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if (ret & (1 << rdev_get_id(rdev))) {
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dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
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rdev_get_id(rdev) + 1);
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return REGULATOR_STATUS_ERROR;
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}
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/* DCDC1 and DCDC2 can additionally detect high voltage/current */
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if (rdev_get_id(rdev) < 2) {
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if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
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dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
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rdev_get_id(rdev) + 1);
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return REGULATOR_STATUS_ERROR;
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}
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if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
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dev_dbg(wm831x->dev, "DCDC%d over current\n",
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rdev_get_id(rdev) + 1);
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return REGULATOR_STATUS_ERROR;
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}
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}
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/* Is the regulator on? */
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ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
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if (ret < 0)
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return ret;
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if (!(ret & (1 << rdev_get_id(rdev))))
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return REGULATOR_STATUS_OFF;
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/* TODO: When we handle hardware control modes so we can report the
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* current mode. */
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return REGULATOR_STATUS_ON;
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}
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static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
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{
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struct wm831x_dcdc *dcdc = data;
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regulator_notifier_call_chain(dcdc->regulator,
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REGULATOR_EVENT_UNDER_VOLTAGE,
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NULL);
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return IRQ_HANDLED;
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}
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static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
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{
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struct wm831x_dcdc *dcdc = data;
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regulator_notifier_call_chain(dcdc->regulator,
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REGULATOR_EVENT_OVER_CURRENT,
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NULL);
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return IRQ_HANDLED;
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}
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/*
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* BUCKV specifics
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*/
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static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
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unsigned selector)
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{
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if (selector <= 0x8)
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return 600000;
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if (selector <= WM831X_BUCKV_MAX_SELECTOR)
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return 600000 + ((selector - 0x8) * 12500);
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return -EINVAL;
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}
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static int wm831x_buckv_set_voltage_int(struct regulator_dev *rdev, int reg,
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int min_uV, int max_uV)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 vsel;
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if (min_uV < 600000)
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vsel = 0;
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else if (min_uV <= 1800000)
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vsel = ((min_uV - 600000) / 12500) + 8;
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else
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return -EINVAL;
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if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
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return -EINVAL;
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return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_VSEL_MASK, vsel);
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}
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static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
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return wm831x_buckv_set_voltage_int(rdev, reg, min_uV, max_uV);
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}
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static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
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int uV)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
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return wm831x_buckv_set_voltage_int(rdev, reg, uV, uV);
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}
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static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
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int val;
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val = wm831x_reg_read(wm831x, reg);
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if (val < 0)
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return val;
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return wm831x_buckv_list_voltage(rdev, val & WM831X_DC1_ON_VSEL_MASK);
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}
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/* Current limit options */
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static u16 wm831x_dcdc_ilim[] = {
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125, 250, 375, 500, 625, 750, 875, 1000
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};
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static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
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int min_uA, int max_uA)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
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int i;
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for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
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if (max_uA <= wm831x_dcdc_ilim[i])
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break;
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}
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if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
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return -EINVAL;
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return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
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}
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static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
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{
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struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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struct wm831x *wm831x = dcdc->wm831x;
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u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
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int val;
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val = wm831x_reg_read(wm831x, reg);
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if (val < 0)
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return val;
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return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
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}
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static struct regulator_ops wm831x_buckv_ops = {
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.set_voltage = wm831x_buckv_set_voltage,
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.get_voltage = wm831x_buckv_get_voltage,
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.list_voltage = wm831x_buckv_list_voltage,
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.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
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.set_current_limit = wm831x_buckv_set_current_limit,
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.get_current_limit = wm831x_buckv_get_current_limit,
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.is_enabled = wm831x_dcdc_is_enabled,
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.enable = wm831x_dcdc_enable,
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.disable = wm831x_dcdc_disable,
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.get_status = wm831x_dcdc_get_status,
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.get_mode = wm831x_dcdc_get_mode,
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.set_mode = wm831x_dcdc_set_mode,
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.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
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};
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static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_pdata *pdata = wm831x->dev->platform_data;
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int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
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struct wm831x_dcdc *dcdc;
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struct resource *res;
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int ret, irq;
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dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
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if (pdata == NULL || pdata->dcdc[id] == NULL)
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return -ENODEV;
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dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
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if (dcdc == NULL) {
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dev_err(&pdev->dev, "Unable to allocate private data\n");
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return -ENOMEM;
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}
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dcdc->wm831x = wm831x;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "No I/O resource\n");
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ret = -EINVAL;
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goto err;
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}
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dcdc->base = res->start;
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snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
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dcdc->desc.name = dcdc->name;
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dcdc->desc.id = id;
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dcdc->desc.type = REGULATOR_VOLTAGE;
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dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
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dcdc->desc.ops = &wm831x_buckv_ops;
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dcdc->desc.owner = THIS_MODULE;
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dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
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pdata->dcdc[id], dcdc);
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if (IS_ERR(dcdc->regulator)) {
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ret = PTR_ERR(dcdc->regulator);
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dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
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id + 1, ret);
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goto err;
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}
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irq = platform_get_irq_byname(pdev, "UV");
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ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
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IRQF_TRIGGER_RISING, dcdc->name,
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dcdc);
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if (ret != 0) {
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dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
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irq, ret);
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goto err_regulator;
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}
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irq = platform_get_irq_byname(pdev, "HC");
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ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
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IRQF_TRIGGER_RISING, dcdc->name,
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dcdc);
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if (ret != 0) {
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dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
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irq, ret);
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goto err_uv;
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}
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platform_set_drvdata(pdev, dcdc);
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return 0;
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err_uv:
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wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
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err_regulator:
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regulator_unregister(dcdc->regulator);
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err:
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kfree(dcdc);
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return ret;
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}
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static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
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{
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struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
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struct wm831x *wm831x = dcdc->wm831x;
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wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
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wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
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regulator_unregister(dcdc->regulator);
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kfree(dcdc);
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return 0;
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}
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static struct platform_driver wm831x_buckv_driver = {
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.probe = wm831x_buckv_probe,
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.remove = __devexit_p(wm831x_buckv_remove),
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.driver = {
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|
.name = "wm831x-buckv",
|
|
},
|
|
};
|
|
|
|
/*
|
|
* BUCKP specifics
|
|
*/
|
|
|
|
static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
|
|
unsigned selector)
|
|
{
|
|
if (selector <= WM831X_BUCKP_MAX_SELECTOR)
|
|
return 850000 + (selector * 25000);
|
|
else
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
|
|
int min_uV, int max_uV)
|
|
{
|
|
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
|
|
struct wm831x *wm831x = dcdc->wm831x;
|
|
u16 vsel;
|
|
|
|
if (min_uV <= 34000000)
|
|
vsel = (min_uV - 850000) / 25000;
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
|
|
return -EINVAL;
|
|
|
|
return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
|
|
}
|
|
|
|
static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
|
|
int min_uV, int max_uV)
|
|
{
|
|
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
|
|
u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
|
|
|
|
return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
|
|
}
|
|
|
|
static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
|
|
int uV)
|
|
{
|
|
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
|
|
u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
|
|
|
|
return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
|
|
}
|
|
|
|
static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
|
|
{
|
|
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
|
|
struct wm831x *wm831x = dcdc->wm831x;
|
|
u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
|
|
int val;
|
|
|
|
val = wm831x_reg_read(wm831x, reg);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
|
|
}
|
|
|
|
static struct regulator_ops wm831x_buckp_ops = {
|
|
.set_voltage = wm831x_buckp_set_voltage,
|
|
.get_voltage = wm831x_buckp_get_voltage,
|
|
.list_voltage = wm831x_buckp_list_voltage,
|
|
.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
|
|
|
|
.is_enabled = wm831x_dcdc_is_enabled,
|
|
.enable = wm831x_dcdc_enable,
|
|
.disable = wm831x_dcdc_disable,
|
|
.get_status = wm831x_dcdc_get_status,
|
|
.get_mode = wm831x_dcdc_get_mode,
|
|
.set_mode = wm831x_dcdc_set_mode,
|
|
.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
|
|
};
|
|
|
|
static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
|
|
int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
|
|
struct wm831x_dcdc *dcdc;
|
|
struct resource *res;
|
|
int ret, irq;
|
|
|
|
dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
|
|
|
|
if (pdata == NULL || pdata->dcdc[id] == NULL)
|
|
return -ENODEV;
|
|
|
|
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
|
|
if (dcdc == NULL) {
|
|
dev_err(&pdev->dev, "Unable to allocate private data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dcdc->wm831x = wm831x;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
if (res == NULL) {
|
|
dev_err(&pdev->dev, "No I/O resource\n");
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
dcdc->base = res->start;
|
|
|
|
snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
|
|
dcdc->desc.name = dcdc->name;
|
|
dcdc->desc.id = id;
|
|
dcdc->desc.type = REGULATOR_VOLTAGE;
|
|
dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
|
|
dcdc->desc.ops = &wm831x_buckp_ops;
|
|
dcdc->desc.owner = THIS_MODULE;
|
|
|
|
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
|
|
pdata->dcdc[id], dcdc);
|
|
if (IS_ERR(dcdc->regulator)) {
|
|
ret = PTR_ERR(dcdc->regulator);
|
|
dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
|
|
id + 1, ret);
|
|
goto err;
|
|
}
|
|
|
|
irq = platform_get_irq_byname(pdev, "UV");
|
|
ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
|
|
IRQF_TRIGGER_RISING, dcdc->name,
|
|
dcdc);
|
|
if (ret != 0) {
|
|
dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
|
|
irq, ret);
|
|
goto err_regulator;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, dcdc);
|
|
|
|
return 0;
|
|
|
|
err_regulator:
|
|
regulator_unregister(dcdc->regulator);
|
|
err:
|
|
kfree(dcdc);
|
|
return ret;
|
|
}
|
|
|
|
static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
|
|
{
|
|
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
|
|
struct wm831x *wm831x = dcdc->wm831x;
|
|
|
|
wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
|
|
regulator_unregister(dcdc->regulator);
|
|
kfree(dcdc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm831x_buckp_driver = {
|
|
.probe = wm831x_buckp_probe,
|
|
.remove = __devexit_p(wm831x_buckp_remove),
|
|
.driver = {
|
|
.name = "wm831x-buckp",
|
|
},
|
|
};
|
|
|
|
static int __init wm831x_dcdc_init(void)
|
|
{
|
|
int ret;
|
|
ret = platform_driver_register(&wm831x_buckv_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
|
|
|
|
ret = platform_driver_register(&wm831x_buckp_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(wm831x_dcdc_init);
|
|
|
|
static void __exit wm831x_dcdc_exit(void)
|
|
{
|
|
platform_driver_unregister(&wm831x_buckp_driver);
|
|
platform_driver_unregister(&wm831x_buckv_driver);
|
|
}
|
|
module_exit(wm831x_dcdc_exit);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Mark Brown");
|
|
MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm831x-buckv");
|
|
MODULE_ALIAS("platform:wm831x-buckp");
|