669 lines
17 KiB
C
669 lines
17 KiB
C
/*
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* PMU driver for Wolfson Microelectronics wm831x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/auxadc.h>
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#include <linux/mfd/wm831x/pmu.h>
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#include <linux/mfd/wm831x/pdata.h>
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struct wm831x_power {
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struct wm831x *wm831x;
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struct power_supply wall;
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struct power_supply usb;
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struct power_supply battery;
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char wall_name[20];
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char usb_name[20];
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char battery_name[20];
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bool have_battery;
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};
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static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
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union power_supply_propval *val)
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{
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int ret;
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ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
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if (ret < 0)
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return ret;
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if (ret & supply)
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val->intval = 1;
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else
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val->intval = 0;
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return 0;
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}
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static int wm831x_power_read_voltage(struct wm831x *wm831x,
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enum wm831x_auxadc src,
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union power_supply_propval *val)
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{
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int ret;
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ret = wm831x_auxadc_read_uv(wm831x, src);
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if (ret >= 0)
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val->intval = ret;
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return ret;
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}
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/*********************************************************************
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* WALL Power
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*********************************************************************/
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static int wm831x_wall_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
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struct wm831x *wm831x = wm831x_power->wm831x;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm831x_wall_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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/*********************************************************************
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* USB Power
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*********************************************************************/
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static int wm831x_usb_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
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struct wm831x *wm831x = wm831x_power->wm831x;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm831x_usb_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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/*********************************************************************
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* Battery properties
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*********************************************************************/
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struct chg_map {
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int val;
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int reg_val;
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};
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static struct chg_map trickle_ilims[] = {
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{ 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
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{ 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
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{ 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
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{ 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
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};
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static struct chg_map vsels[] = {
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{ 4050, 0 << WM831X_CHG_VSEL_SHIFT },
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{ 4100, 1 << WM831X_CHG_VSEL_SHIFT },
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{ 4150, 2 << WM831X_CHG_VSEL_SHIFT },
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{ 4200, 3 << WM831X_CHG_VSEL_SHIFT },
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};
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static struct chg_map fast_ilims[] = {
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{ 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
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{ 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
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};
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static struct chg_map eoc_iterms[] = {
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{ 20, 0 << WM831X_CHG_ITERM_SHIFT },
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{ 30, 1 << WM831X_CHG_ITERM_SHIFT },
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{ 40, 2 << WM831X_CHG_ITERM_SHIFT },
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{ 50, 3 << WM831X_CHG_ITERM_SHIFT },
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{ 60, 4 << WM831X_CHG_ITERM_SHIFT },
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{ 70, 5 << WM831X_CHG_ITERM_SHIFT },
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{ 80, 6 << WM831X_CHG_ITERM_SHIFT },
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{ 90, 7 << WM831X_CHG_ITERM_SHIFT },
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};
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static struct chg_map chg_times[] = {
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{ 60, 0 << WM831X_CHG_TIME_SHIFT },
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{ 90, 1 << WM831X_CHG_TIME_SHIFT },
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{ 120, 2 << WM831X_CHG_TIME_SHIFT },
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{ 150, 3 << WM831X_CHG_TIME_SHIFT },
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{ 180, 4 << WM831X_CHG_TIME_SHIFT },
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{ 210, 5 << WM831X_CHG_TIME_SHIFT },
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{ 240, 6 << WM831X_CHG_TIME_SHIFT },
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{ 270, 7 << WM831X_CHG_TIME_SHIFT },
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{ 300, 8 << WM831X_CHG_TIME_SHIFT },
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{ 330, 9 << WM831X_CHG_TIME_SHIFT },
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{ 360, 10 << WM831X_CHG_TIME_SHIFT },
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{ 390, 11 << WM831X_CHG_TIME_SHIFT },
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{ 420, 12 << WM831X_CHG_TIME_SHIFT },
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{ 450, 13 << WM831X_CHG_TIME_SHIFT },
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{ 480, 14 << WM831X_CHG_TIME_SHIFT },
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{ 510, 15 << WM831X_CHG_TIME_SHIFT },
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};
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static void wm831x_battey_apply_config(struct wm831x *wm831x,
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struct chg_map *map, int count, int val,
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int *reg, const char *name,
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const char *units)
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{
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int i;
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for (i = 0; i < count; i++)
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if (val == map[i].val)
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break;
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if (i == count) {
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dev_err(wm831x->dev, "Invalid %s %d%s\n",
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name, val, units);
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} else {
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*reg |= map[i].reg_val;
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dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
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}
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}
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static void wm831x_config_battery(struct wm831x *wm831x)
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{
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struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
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struct wm831x_battery_pdata *pdata;
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int ret, reg1, reg2;
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if (!wm831x_pdata || !wm831x_pdata->battery) {
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dev_warn(wm831x->dev,
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"No battery charger configuration\n");
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return;
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}
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pdata = wm831x_pdata->battery;
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reg1 = 0;
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reg2 = 0;
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if (!pdata->enable) {
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dev_info(wm831x->dev, "Battery charger disabled\n");
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return;
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}
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reg1 |= WM831X_CHG_ENA;
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if (pdata->off_mask)
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reg2 |= WM831X_CHG_OFF_MSK;
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if (pdata->fast_enable)
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reg1 |= WM831X_CHG_FAST;
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wm831x_battey_apply_config(wm831x, trickle_ilims,
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ARRAY_SIZE(trickle_ilims),
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pdata->trickle_ilim, ®2,
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"trickle charge current limit", "mA");
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wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
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pdata->vsel, ®2,
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"target voltage", "mV");
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wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
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pdata->fast_ilim, ®2,
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"fast charge current limit", "mA");
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wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
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pdata->eoc_iterm, ®1,
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"end of charge current threshold", "mA");
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wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
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pdata->timeout, ®2,
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"charger timeout", "min");
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ret = wm831x_reg_unlock(wm831x);
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if (ret != 0) {
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dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
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return;
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}
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ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
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WM831X_CHG_ENA_MASK |
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WM831X_CHG_FAST_MASK |
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WM831X_CHG_ITERM_MASK,
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reg1);
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if (ret != 0)
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dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
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ret);
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ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
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WM831X_CHG_OFF_MSK |
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WM831X_CHG_TIME_MASK |
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WM831X_CHG_FAST_ILIM_MASK |
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WM831X_CHG_TRKL_ILIM_MASK |
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WM831X_CHG_VSEL_MASK,
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reg2);
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if (ret != 0)
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dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
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ret);
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wm831x_reg_lock(wm831x);
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}
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static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
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{
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int ret;
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ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
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if (ret < 0)
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return ret;
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if (ret & WM831X_PWR_SRC_BATT) {
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*status = POWER_SUPPLY_STATUS_DISCHARGING;
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return 0;
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}
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ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
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if (ret < 0)
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return ret;
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switch (ret & WM831X_CHG_STATE_MASK) {
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case WM831X_CHG_STATE_OFF:
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*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case WM831X_CHG_STATE_TRICKLE:
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case WM831X_CHG_STATE_FAST:
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*status = POWER_SUPPLY_STATUS_CHARGING;
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break;
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default:
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*status = POWER_SUPPLY_STATUS_UNKNOWN;
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break;
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}
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return 0;
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}
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static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
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{
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int ret;
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ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
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if (ret < 0)
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return ret;
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switch (ret & WM831X_CHG_STATE_MASK) {
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case WM831X_CHG_STATE_TRICKLE:
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case WM831X_CHG_STATE_TRICKLE_OT:
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*type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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break;
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case WM831X_CHG_STATE_FAST:
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case WM831X_CHG_STATE_FAST_OT:
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*type = POWER_SUPPLY_CHARGE_TYPE_FAST;
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break;
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default:
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*type = POWER_SUPPLY_CHARGE_TYPE_NONE;
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break;
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}
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return 0;
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}
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static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
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{
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int ret;
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ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
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if (ret < 0)
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return ret;
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if (ret & WM831X_BATT_HOT_STS) {
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*health = POWER_SUPPLY_HEALTH_OVERHEAT;
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return 0;
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}
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if (ret & WM831X_BATT_COLD_STS) {
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*health = POWER_SUPPLY_HEALTH_COLD;
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return 0;
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}
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if (ret & WM831X_BATT_OV_STS) {
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*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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return 0;
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}
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switch (ret & WM831X_CHG_STATE_MASK) {
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case WM831X_CHG_STATE_TRICKLE_OT:
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case WM831X_CHG_STATE_FAST_OT:
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*health = POWER_SUPPLY_HEALTH_OVERHEAT;
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break;
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case WM831X_CHG_STATE_DEFECTIVE:
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*health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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break;
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default:
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*health = POWER_SUPPLY_HEALTH_GOOD;
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break;
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}
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return 0;
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}
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static int wm831x_bat_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
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struct wm831x *wm831x = wm831x_power->wm831x;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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ret = wm831x_bat_check_status(wm831x, &val->intval);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
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val);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = wm831x_bat_check_health(wm831x, &val->intval);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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ret = wm831x_bat_check_type(wm831x, &val->intval);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm831x_bat_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CHARGE_TYPE,
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};
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static const char *wm831x_bat_irqs[] = {
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"BATT HOT",
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"BATT COLD",
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"BATT FAIL",
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"OV",
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"END",
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"TO",
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"MODE",
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"START",
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};
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static irqreturn_t wm831x_bat_irq(int irq, void *data)
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{
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struct wm831x_power *wm831x_power = data;
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struct wm831x *wm831x = wm831x_power->wm831x;
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dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
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/* The battery charger is autonomous so we don't need to do
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* anything except kick user space */
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if (wm831x_power->have_battery)
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power_supply_changed(&wm831x_power->battery);
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return IRQ_HANDLED;
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}
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|
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/*********************************************************************
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* Initialisation
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*********************************************************************/
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|
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static irqreturn_t wm831x_syslo_irq(int irq, void *data)
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{
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struct wm831x_power *wm831x_power = data;
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struct wm831x *wm831x = wm831x_power->wm831x;
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/* Not much we can actually *do* but tell people for
|
|
* posterity, we're probably about to run out of power. */
|
|
dev_crit(wm831x->dev, "SYSVDD under voltage\n");
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
|
|
{
|
|
struct wm831x_power *wm831x_power = data;
|
|
struct wm831x *wm831x = wm831x_power->wm831x;
|
|
|
|
dev_dbg(wm831x->dev, "Power source changed\n");
|
|
|
|
/* Just notify for everything - little harm in overnotifying. */
|
|
if (wm831x_power->have_battery)
|
|
power_supply_changed(&wm831x_power->battery);
|
|
power_supply_changed(&wm831x_power->usb);
|
|
power_supply_changed(&wm831x_power->wall);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int wm831x_power_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
|
|
struct wm831x_power *power;
|
|
struct power_supply *usb;
|
|
struct power_supply *battery;
|
|
struct power_supply *wall;
|
|
int ret, irq, i;
|
|
|
|
power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
|
|
if (power == NULL)
|
|
return -ENOMEM;
|
|
|
|
power->wm831x = wm831x;
|
|
platform_set_drvdata(pdev, power);
|
|
|
|
usb = &power->usb;
|
|
battery = &power->battery;
|
|
wall = &power->wall;
|
|
|
|
if (wm831x_pdata && wm831x_pdata->wm831x_num) {
|
|
snprintf(power->wall_name, sizeof(power->wall_name),
|
|
"wm831x-wall.%d", wm831x_pdata->wm831x_num);
|
|
snprintf(power->battery_name, sizeof(power->wall_name),
|
|
"wm831x-battery.%d", wm831x_pdata->wm831x_num);
|
|
snprintf(power->usb_name, sizeof(power->wall_name),
|
|
"wm831x-usb.%d", wm831x_pdata->wm831x_num);
|
|
} else {
|
|
snprintf(power->wall_name, sizeof(power->wall_name),
|
|
"wm831x-wall");
|
|
snprintf(power->battery_name, sizeof(power->wall_name),
|
|
"wm831x-battery");
|
|
snprintf(power->usb_name, sizeof(power->wall_name),
|
|
"wm831x-usb");
|
|
}
|
|
|
|
/* We ignore configuration failures since we can still read back
|
|
* the status without enabling the charger.
|
|
*/
|
|
wm831x_config_battery(wm831x);
|
|
|
|
wall->name = power->wall_name;
|
|
wall->type = POWER_SUPPLY_TYPE_MAINS;
|
|
wall->properties = wm831x_wall_props;
|
|
wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
|
|
wall->get_property = wm831x_wall_get_prop;
|
|
ret = power_supply_register(&pdev->dev, wall);
|
|
if (ret)
|
|
goto err_kmalloc;
|
|
|
|
usb->name = power->usb_name,
|
|
usb->type = POWER_SUPPLY_TYPE_USB;
|
|
usb->properties = wm831x_usb_props;
|
|
usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
|
|
usb->get_property = wm831x_usb_get_prop;
|
|
ret = power_supply_register(&pdev->dev, usb);
|
|
if (ret)
|
|
goto err_wall;
|
|
|
|
ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1);
|
|
if (ret < 0)
|
|
goto err_wall;
|
|
power->have_battery = ret & WM831X_CHG_ENA;
|
|
|
|
if (power->have_battery) {
|
|
battery->name = power->battery_name;
|
|
battery->properties = wm831x_bat_props;
|
|
battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
|
|
battery->get_property = wm831x_bat_get_prop;
|
|
battery->use_for_apm = 1;
|
|
ret = power_supply_register(&pdev->dev, battery);
|
|
if (ret)
|
|
goto err_usb;
|
|
}
|
|
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
|
|
ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
|
|
IRQF_TRIGGER_RISING, "System power low",
|
|
power);
|
|
if (ret != 0) {
|
|
dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
|
|
irq, ret);
|
|
goto err_battery;
|
|
}
|
|
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
|
|
ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
|
|
IRQF_TRIGGER_RISING, "Power source",
|
|
power);
|
|
if (ret != 0) {
|
|
dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
|
|
irq, ret);
|
|
goto err_syslo;
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
|
|
irq = wm831x_irq(wm831x,
|
|
platform_get_irq_byname(pdev,
|
|
wm831x_bat_irqs[i]));
|
|
ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
|
|
IRQF_TRIGGER_RISING,
|
|
wm831x_bat_irqs[i],
|
|
power);
|
|
if (ret != 0) {
|
|
dev_err(&pdev->dev,
|
|
"Failed to request %s IRQ %d: %d\n",
|
|
wm831x_bat_irqs[i], irq, ret);
|
|
goto err_bat_irq;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
|
|
err_bat_irq:
|
|
for (; i >= 0; i--) {
|
|
irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
|
|
free_irq(irq, power);
|
|
}
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
|
|
free_irq(irq, power);
|
|
err_syslo:
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
|
|
free_irq(irq, power);
|
|
err_battery:
|
|
if (power->have_battery)
|
|
power_supply_unregister(battery);
|
|
err_usb:
|
|
power_supply_unregister(usb);
|
|
err_wall:
|
|
power_supply_unregister(wall);
|
|
err_kmalloc:
|
|
kfree(power);
|
|
return ret;
|
|
}
|
|
|
|
static int wm831x_power_remove(struct platform_device *pdev)
|
|
{
|
|
struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
|
|
struct wm831x *wm831x = wm831x_power->wm831x;
|
|
int irq, i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
|
|
irq = wm831x_irq(wm831x,
|
|
platform_get_irq_byname(pdev,
|
|
wm831x_bat_irqs[i]));
|
|
free_irq(irq, wm831x_power);
|
|
}
|
|
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC"));
|
|
free_irq(irq, wm831x_power);
|
|
|
|
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO"));
|
|
free_irq(irq, wm831x_power);
|
|
|
|
if (wm831x_power->have_battery)
|
|
power_supply_unregister(&wm831x_power->battery);
|
|
power_supply_unregister(&wm831x_power->wall);
|
|
power_supply_unregister(&wm831x_power->usb);
|
|
kfree(wm831x_power);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm831x_power_driver = {
|
|
.probe = wm831x_power_probe,
|
|
.remove = wm831x_power_remove,
|
|
.driver = {
|
|
.name = "wm831x-power",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(wm831x_power_driver);
|
|
|
|
MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm831x-power");
|