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Ole André Vadla Ravnås
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51358 changed files with 23120455 additions and 0 deletions
227
drivers/power/wm831x_backup.c
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drivers/power/wm831x_backup.c
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/*
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* Backup battery 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_backup {
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struct wm831x *wm831x;
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struct power_supply backup;
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char name[20];
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};
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static int wm831x_backup_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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* Backup supply properties
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*********************************************************************/
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static void wm831x_config_backup(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_backup_pdata *pdata;
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int ret, reg;
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if (!wm831x_pdata || !wm831x_pdata->backup) {
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dev_warn(wm831x->dev,
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"No backup battery charger configuration\n");
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return;
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}
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pdata = wm831x_pdata->backup;
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reg = 0;
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if (pdata->charger_enable)
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reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
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if (pdata->no_constant_voltage)
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reg |= WM831X_BKUP_CHG_MODE;
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switch (pdata->vlim) {
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case 2500:
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break;
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case 3100:
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reg |= WM831X_BKUP_CHG_VLIM;
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break;
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default:
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dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
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pdata->vlim);
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}
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switch (pdata->ilim) {
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case 100:
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break;
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case 200:
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reg |= 1;
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break;
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case 300:
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reg |= 2;
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break;
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case 400:
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reg |= 3;
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break;
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default:
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dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
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pdata->ilim);
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}
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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_BACKUP_CHARGER_CONTROL,
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WM831X_BKUP_CHG_ENA_MASK |
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WM831X_BKUP_CHG_MODE_MASK |
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WM831X_BKUP_BATT_DET_ENA_MASK |
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WM831X_BKUP_CHG_VLIM_MASK |
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WM831X_BKUP_CHG_ILIM_MASK,
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reg);
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if (ret != 0)
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dev_err(wm831x->dev,
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"Failed to set backup charger config: %d\n", ret);
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wm831x_reg_lock(wm831x);
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}
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static int wm831x_backup_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_backup *devdata = dev_get_drvdata(psy->dev->parent);
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struct wm831x *wm831x = devdata->wm831x;
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int ret = 0;
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ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
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if (ret < 0)
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return ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (ret & WM831X_BKUP_CHG_STS)
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
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val);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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if (ret & WM831X_BKUP_CHG_STS)
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val->intval = 1;
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else
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val->intval = 0;
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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_backup_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_PRESENT,
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};
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/*********************************************************************
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* Initialisation
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*********************************************************************/
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static int wm831x_backup_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 *wm831x_pdata = wm831x->dev->platform_data;
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struct wm831x_backup *devdata;
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struct power_supply *backup;
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int ret;
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devdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_backup),
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GFP_KERNEL);
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if (devdata == NULL)
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return -ENOMEM;
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devdata->wm831x = wm831x;
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platform_set_drvdata(pdev, devdata);
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backup = &devdata->backup;
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/* We ignore configuration failures since we can still read
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* back the status without enabling the charger (which may
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* already be enabled anyway).
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*/
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wm831x_config_backup(wm831x);
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if (wm831x_pdata && wm831x_pdata->wm831x_num)
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snprintf(devdata->name, sizeof(devdata->name),
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"wm831x-backup.%d", wm831x_pdata->wm831x_num);
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else
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snprintf(devdata->name, sizeof(devdata->name),
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"wm831x-backup");
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backup->name = devdata->name;
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backup->type = POWER_SUPPLY_TYPE_BATTERY;
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backup->properties = wm831x_backup_props;
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backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
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backup->get_property = wm831x_backup_get_prop;
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ret = power_supply_register(&pdev->dev, backup);
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return ret;
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}
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static int wm831x_backup_remove(struct platform_device *pdev)
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{
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struct wm831x_backup *devdata = platform_get_drvdata(pdev);
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power_supply_unregister(&devdata->backup);
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return 0;
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}
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static struct platform_driver wm831x_backup_driver = {
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.probe = wm831x_backup_probe,
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.remove = wm831x_backup_remove,
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.driver = {
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.name = "wm831x-backup",
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},
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};
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module_platform_driver(wm831x_backup_driver);
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MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-backup");
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