^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Backup battery driver for Wolfson Microelectronics wm831x PMICs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2009 Wolfson Microelectronics PLC.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/power_supply.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mfd/wm831x/core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mfd/wm831x/auxadc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mfd/wm831x/pmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mfd/wm831x/pdata.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct wm831x_backup {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct wm831x *wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct power_supply *backup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct power_supply_desc backup_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) char name[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int wm831x_backup_read_voltage(struct wm831x *wm831x,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) enum wm831x_auxadc src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) union power_supply_propval *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) ret = wm831x_auxadc_read_uv(wm831x, src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (ret >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) val->intval = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Backup supply properties
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static void wm831x_config_backup(struct wm831x *wm831x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct wm831x_backup_pdata *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ret, reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!wm831x_pdata || !wm831x_pdata->backup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) dev_warn(wm831x->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) "No backup battery charger configuration\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) pdata = wm831x_pdata->backup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) reg = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (pdata->charger_enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (pdata->no_constant_voltage)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) reg |= WM831X_BKUP_CHG_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) switch (pdata->vlim) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) case 2500:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case 3100:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) reg |= WM831X_BKUP_CHG_VLIM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) pdata->vlim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) switch (pdata->ilim) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) case 100:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) case 200:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) reg |= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) case 300:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) reg |= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) case 400:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) reg |= 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) pdata->ilim);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ret = wm831x_reg_unlock(wm831x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) WM831X_BKUP_CHG_ENA_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) WM831X_BKUP_CHG_MODE_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) WM831X_BKUP_BATT_DET_ENA_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) WM831X_BKUP_CHG_VLIM_MASK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) WM831X_BKUP_CHG_ILIM_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) dev_err(wm831x->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) "Failed to set backup charger config: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) wm831x_reg_lock(wm831x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int wm831x_backup_get_prop(struct power_supply *psy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) enum power_supply_property psp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) union power_supply_propval *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct wm831x_backup *devdata = dev_get_drvdata(psy->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct wm831x *wm831x = devdata->wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) switch (psp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) case POWER_SUPPLY_PROP_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (ret & WM831X_BKUP_CHG_STS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) val->intval = POWER_SUPPLY_STATUS_CHARGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) case POWER_SUPPLY_PROP_VOLTAGE_NOW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) case POWER_SUPPLY_PROP_PRESENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (ret & WM831X_BKUP_CHG_STS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) val->intval = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) val->intval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static enum power_supply_property wm831x_backup_props[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) POWER_SUPPLY_PROP_STATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) POWER_SUPPLY_PROP_VOLTAGE_NOW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) POWER_SUPPLY_PROP_PRESENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * Initialisation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static int wm831x_backup_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct wm831x_backup *devdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) devdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_backup),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (devdata == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) devdata->wm831x = wm831x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) platform_set_drvdata(pdev, devdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* We ignore configuration failures since we can still read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * back the status without enabling the charger (which may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * already be enabled anyway).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) wm831x_config_backup(wm831x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (wm831x_pdata && wm831x_pdata->wm831x_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) snprintf(devdata->name, sizeof(devdata->name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) "wm831x-backup.%d", wm831x_pdata->wm831x_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) snprintf(devdata->name, sizeof(devdata->name),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) "wm831x-backup");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) devdata->backup_desc.name = devdata->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) devdata->backup_desc.type = POWER_SUPPLY_TYPE_BATTERY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) devdata->backup_desc.properties = wm831x_backup_props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) devdata->backup_desc.num_properties = ARRAY_SIZE(wm831x_backup_props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) devdata->backup_desc.get_property = wm831x_backup_get_prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) devdata->backup = power_supply_register(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) &devdata->backup_desc, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return PTR_ERR_OR_ZERO(devdata->backup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static int wm831x_backup_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct wm831x_backup *devdata = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) power_supply_unregister(devdata->backup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static struct platform_driver wm831x_backup_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) .probe = wm831x_backup_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) .remove = wm831x_backup_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) .name = "wm831x-backup",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) module_platform_driver(wm831x_backup_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) MODULE_ALIAS("platform:wm831x-backup");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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