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drivers/power/wm831x_backup.c
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/* * Backup battery driver for Wolfson Microelectronics wm831x PMICs * * Copyright 2009 Wolfson Microelectronics PLC. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/power_supply.h> |
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#include <linux/slab.h> |
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#include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/auxadc.h> #include <linux/mfd/wm831x/pmu.h> #include <linux/mfd/wm831x/pdata.h> struct wm831x_backup { struct wm831x *wm831x; |
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struct power_supply *backup; struct power_supply_desc backup_desc; |
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char name[20]; |
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}; static int wm831x_backup_read_voltage(struct wm831x *wm831x, enum wm831x_auxadc src, union power_supply_propval *val) { int ret; ret = wm831x_auxadc_read_uv(wm831x, src); if (ret >= 0) val->intval = ret; return ret; } /********************************************************************* * Backup supply properties *********************************************************************/ static void wm831x_config_backup(struct wm831x *wm831x) { struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; struct wm831x_backup_pdata *pdata; int ret, reg; if (!wm831x_pdata || !wm831x_pdata->backup) { dev_warn(wm831x->dev, "No backup battery charger configuration "); return; } pdata = wm831x_pdata->backup; reg = 0; if (pdata->charger_enable) reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA; if (pdata->no_constant_voltage) reg |= WM831X_BKUP_CHG_MODE; switch (pdata->vlim) { case 2500: break; case 3100: reg |= WM831X_BKUP_CHG_VLIM; break; default: dev_err(wm831x->dev, "Invalid backup voltage limit %dmV ", pdata->vlim); } switch (pdata->ilim) { case 100: break; case 200: reg |= 1; break; case 300: reg |= 2; break; case 400: reg |= 3; break; default: dev_err(wm831x->dev, "Invalid backup current limit %duA ", pdata->ilim); } ret = wm831x_reg_unlock(wm831x); if (ret != 0) { dev_err(wm831x->dev, "Failed to unlock registers: %d ", ret); return; } ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL, WM831X_BKUP_CHG_ENA_MASK | WM831X_BKUP_CHG_MODE_MASK | WM831X_BKUP_BATT_DET_ENA_MASK | WM831X_BKUP_CHG_VLIM_MASK | WM831X_BKUP_CHG_ILIM_MASK, reg); if (ret != 0) dev_err(wm831x->dev, "Failed to set backup charger config: %d ", ret); wm831x_reg_lock(wm831x); } static int wm831x_backup_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { |
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struct wm831x_backup *devdata = dev_get_drvdata(psy->dev.parent); |
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struct wm831x *wm831x = devdata->wm831x; int ret = 0; ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL); if (ret < 0) return ret; switch (psp) { case POWER_SUPPLY_PROP_STATUS: if (ret & WM831X_BKUP_CHG_STS) val->intval = POWER_SUPPLY_STATUS_CHARGING; else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT, val); break; case POWER_SUPPLY_PROP_PRESENT: if (ret & WM831X_BKUP_CHG_STS) val->intval = 1; else val->intval = 0; break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm831x_backup_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_PRESENT, }; /********************************************************************* * Initialisation *********************************************************************/ |
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static int wm831x_backup_probe(struct platform_device *pdev) |
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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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devdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_backup), GFP_KERNEL); |
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if (devdata == NULL) return -ENOMEM; devdata->wm831x = wm831x; platform_set_drvdata(pdev, devdata); |
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/* We ignore configuration failures since we can still read * back the status without enabling the charger (which may * already be enabled anyway). */ wm831x_config_backup(wm831x); |
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if (wm831x_pdata && wm831x_pdata->wm831x_num) snprintf(devdata->name, sizeof(devdata->name), "wm831x-backup.%d", wm831x_pdata->wm831x_num); else snprintf(devdata->name, sizeof(devdata->name), "wm831x-backup"); |
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devdata->backup_desc.name = devdata->name; devdata->backup_desc.type = POWER_SUPPLY_TYPE_BATTERY; devdata->backup_desc.properties = wm831x_backup_props; devdata->backup_desc.num_properties = ARRAY_SIZE(wm831x_backup_props); devdata->backup_desc.get_property = wm831x_backup_get_prop; devdata->backup = power_supply_register(&pdev->dev, &devdata->backup_desc, NULL); |
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return PTR_ERR_OR_ZERO(devdata->backup); |
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} |
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static int wm831x_backup_remove(struct platform_device *pdev) |
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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; } static struct platform_driver wm831x_backup_driver = { .probe = wm831x_backup_probe, |
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.remove = wm831x_backup_remove, |
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.driver = { .name = "wm831x-backup", }, }; |
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module_platform_driver(wm831x_backup_driver); |
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MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs"); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm831x-backup"); |