Blame view
drivers/power/wm831x_backup.c
5.51 KB
c26964ead wm831x: Factor ou... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
/* * 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> |
5a0e3ad6a include cleanup: ... |
15 |
#include <linux/slab.h> |
c26964ead wm831x: Factor ou... |
16 17 18 19 20 21 22 23 24 |
#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; struct power_supply backup; |
d03760318 wm831x_backup: Su... |
25 |
char name[20]; |
c26964ead wm831x: Factor ou... |
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 |
}; 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) { struct wm831x_backup *devdata = dev_get_drvdata(psy->dev->parent); 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 *********************************************************************/ static __devinit int wm831x_backup_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); |
d03760318 wm831x_backup: Su... |
172 |
struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; |
c26964ead wm831x: Factor ou... |
173 174 |
struct wm831x_backup *devdata; struct power_supply *backup; |
0e19dbb73 wm831x_backup: Re... |
175 |
int ret; |
c26964ead wm831x: Factor ou... |
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 |
devdata = kzalloc(sizeof(struct wm831x_backup), GFP_KERNEL); if (devdata == NULL) return -ENOMEM; devdata->wm831x = wm831x; platform_set_drvdata(pdev, devdata); backup = &devdata->backup; /* 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); |
d03760318 wm831x_backup: Su... |
191 192 193 194 195 196 197 198 |
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"); backup->name = devdata->name; |
c26964ead wm831x: Factor ou... |
199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 |
backup->type = POWER_SUPPLY_TYPE_BATTERY; backup->properties = wm831x_backup_props; backup->num_properties = ARRAY_SIZE(wm831x_backup_props); backup->get_property = wm831x_backup_get_prop; ret = power_supply_register(&pdev->dev, backup); if (ret) goto err_kmalloc; return ret; err_kmalloc: kfree(devdata); return ret; } static __devexit int wm831x_backup_remove(struct platform_device *pdev) { struct wm831x_backup *devdata = platform_get_drvdata(pdev); power_supply_unregister(&devdata->backup); |
d03760318 wm831x_backup: Su... |
219 |
kfree(devdata->backup.name); |
c26964ead wm831x: Factor ou... |
220 221 222 223 224 225 226 227 228 229 230 231 |
kfree(devdata); return 0; } static struct platform_driver wm831x_backup_driver = { .probe = wm831x_backup_probe, .remove = __devexit_p(wm831x_backup_remove), .driver = { .name = "wm831x-backup", }, }; |
300bac7fb power_supply: Con... |
232 |
module_platform_driver(wm831x_backup_driver); |
c26964ead wm831x: Factor ou... |
233 234 235 236 237 |
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"); |