/* * PMU 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> #include <linux/slab.h> #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_power { struct wm831x *wm831x; struct power_supply *wall; struct power_supply *usb; struct power_supply *battery; struct power_supply_desc wall_desc; struct power_supply_desc usb_desc; struct power_supply_desc battery_desc; char wall_name[20]; char usb_name[20]; char battery_name[20]; bool have_battery; }; static int wm831x_power_check_online(struct wm831x *wm831x, int supply, union power_supply_propval *val) { int ret; ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); if (ret < 0) return ret; if (ret & supply) val->intval = 1; else val->intval = 0; return 0; } static int wm831x_power_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; } /********************************************************************* * WALL Power *********************************************************************/ static int wm831x_wall_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); struct wm831x *wm831x = wm831x_power->wm831x; int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm831x_wall_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; /********************************************************************* * USB Power *********************************************************************/ static int wm831x_usb_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); struct wm831x *wm831x = wm831x_power->wm831x; int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm831x_usb_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; /********************************************************************* * Battery properties *********************************************************************/ struct chg_map { int val; int reg_val; }; static struct chg_map trickle_ilims[] = { { 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT }, { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT }, { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT }, { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT }, }; static struct chg_map vsels[] = { { 4050, 0 << WM831X_CHG_VSEL_SHIFT }, { 4100, 1 << WM831X_CHG_VSEL_SHIFT }, { 4150, 2 << WM831X_CHG_VSEL_SHIFT }, { 4200, 3 << WM831X_CHG_VSEL_SHIFT }, }; static struct chg_map fast_ilims[] = { { 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT }, { 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT }, { 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT }, { 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT }, { 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT }, { 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT }, { 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT }, { 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT }, { 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT }, { 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT }, { 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT }, { 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT }, { 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT }, { 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT }, { 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT }, { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT }, }; static struct chg_map eoc_iterms[] = { { 20, 0 << WM831X_CHG_ITERM_SHIFT }, { 30, 1 << WM831X_CHG_ITERM_SHIFT }, { 40, 2 << WM831X_CHG_ITERM_SHIFT }, { 50, 3 << WM831X_CHG_ITERM_SHIFT }, { 60, 4 << WM831X_CHG_ITERM_SHIFT }, { 70, 5 << WM831X_CHG_ITERM_SHIFT }, { 80, 6 << WM831X_CHG_ITERM_SHIFT }, { 90, 7 << WM831X_CHG_ITERM_SHIFT }, }; static struct chg_map chg_times[] = { { 60, 0 << WM831X_CHG_TIME_SHIFT }, { 90, 1 << WM831X_CHG_TIME_SHIFT }, { 120, 2 << WM831X_CHG_TIME_SHIFT }, { 150, 3 << WM831X_CHG_TIME_SHIFT }, { 180, 4 << WM831X_CHG_TIME_SHIFT }, { 210, 5 << WM831X_CHG_TIME_SHIFT }, { 240, 6 << WM831X_CHG_TIME_SHIFT }, { 270, 7 << WM831X_CHG_TIME_SHIFT }, { 300, 8 << WM831X_CHG_TIME_SHIFT }, { 330, 9 << WM831X_CHG_TIME_SHIFT }, { 360, 10 << WM831X_CHG_TIME_SHIFT }, { 390, 11 << WM831X_CHG_TIME_SHIFT }, { 420, 12 << WM831X_CHG_TIME_SHIFT }, { 450, 13 << WM831X_CHG_TIME_SHIFT }, { 480, 14 << WM831X_CHG_TIME_SHIFT }, { 510, 15 << WM831X_CHG_TIME_SHIFT }, }; static void wm831x_battey_apply_config(struct wm831x *wm831x, struct chg_map *map, int count, int val, int *reg, const char *name, const char *units) { int i; for (i = 0; i < count; i++) if (val == map[i].val) break; if (i == count) { dev_err(wm831x->dev, "Invalid %s %d%s\n", name, val, units); } else { *reg |= map[i].reg_val; dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units); } } static void wm831x_config_battery(struct wm831x *wm831x) { struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; struct wm831x_battery_pdata *pdata; int ret, reg1, reg2; if (!wm831x_pdata || !wm831x_pdata->battery) { dev_warn(wm831x->dev, "No battery charger configuration\n"); return; } pdata = wm831x_pdata->battery; reg1 = 0; reg2 = 0; if (!pdata->enable) { dev_info(wm831x->dev, "Battery charger disabled\n"); return; } reg1 |= WM831X_CHG_ENA; if (pdata->off_mask) reg2 |= WM831X_CHG_OFF_MSK; if (pdata->fast_enable) reg1 |= WM831X_CHG_FAST; wm831x_battey_apply_config(wm831x, trickle_ilims, ARRAY_SIZE(trickle_ilims), pdata->trickle_ilim, ®2, "trickle charge current limit", "mA"); wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels), pdata->vsel, ®2, "target voltage", "mV"); wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims), pdata->fast_ilim, ®2, "fast charge current limit", "mA"); wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms), pdata->eoc_iterm, ®1, "end of charge current threshold", "mA"); wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times), pdata->timeout, ®2, "charger timeout", "min"); ret = wm831x_reg_unlock(wm831x); if (ret != 0) { dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret); return; } ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1, WM831X_CHG_ENA_MASK | WM831X_CHG_FAST_MASK | WM831X_CHG_ITERM_MASK, reg1); if (ret != 0) dev_err(wm831x->dev, "Failed to set charger control 1: %d\n", ret); ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2, WM831X_CHG_OFF_MSK | WM831X_CHG_TIME_MASK | WM831X_CHG_FAST_ILIM_MASK | WM831X_CHG_TRKL_ILIM_MASK | WM831X_CHG_VSEL_MASK, reg2); if (ret != 0) dev_err(wm831x->dev, "Failed to set charger control 2: %d\n", ret); wm831x_reg_lock(wm831x); } static int wm831x_bat_check_status(struct wm831x *wm831x, int *status) { int ret; ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); if (ret < 0) return ret; if (ret & WM831X_PWR_SRC_BATT) { *status = POWER_SUPPLY_STATUS_DISCHARGING; return 0; } ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); if (ret < 0) return ret; switch (ret & WM831X_CHG_STATE_MASK) { case WM831X_CHG_STATE_OFF: *status = POWER_SUPPLY_STATUS_NOT_CHARGING; break; case WM831X_CHG_STATE_TRICKLE: case WM831X_CHG_STATE_FAST: *status = POWER_SUPPLY_STATUS_CHARGING; break; default: *status = POWER_SUPPLY_STATUS_UNKNOWN; break; } return 0; } static int wm831x_bat_check_type(struct wm831x *wm831x, int *type) { int ret; ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); if (ret < 0) return ret; switch (ret & WM831X_CHG_STATE_MASK) { case WM831X_CHG_STATE_TRICKLE: case WM831X_CHG_STATE_TRICKLE_OT: *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; break; case WM831X_CHG_STATE_FAST: case WM831X_CHG_STATE_FAST_OT: *type = POWER_SUPPLY_CHARGE_TYPE_FAST; break; default: *type = POWER_SUPPLY_CHARGE_TYPE_NONE; break; } return 0; } static int wm831x_bat_check_health(struct wm831x *wm831x, int *health) { int ret; ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); if (ret < 0) return ret; if (ret & WM831X_BATT_HOT_STS) { *health = POWER_SUPPLY_HEALTH_OVERHEAT; return 0; } if (ret & WM831X_BATT_COLD_STS) { *health = POWER_SUPPLY_HEALTH_COLD; return 0; } if (ret & WM831X_BATT_OV_STS) { *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; return 0; } switch (ret & WM831X_CHG_STATE_MASK) { case WM831X_CHG_STATE_TRICKLE_OT: case WM831X_CHG_STATE_FAST_OT: *health = POWER_SUPPLY_HEALTH_OVERHEAT; break; case WM831X_CHG_STATE_DEFECTIVE: *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; break; default: *health = POWER_SUPPLY_HEALTH_GOOD; break; } return 0; } static int wm831x_bat_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); struct wm831x *wm831x = wm831x_power->wm831x; int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_STATUS: ret = wm831x_bat_check_status(wm831x, &val->intval); break; case POWER_SUPPLY_PROP_ONLINE: ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT, val); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val); break; case POWER_SUPPLY_PROP_HEALTH: ret = wm831x_bat_check_health(wm831x, &val->intval); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: ret = wm831x_bat_check_type(wm831x, &val->intval); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm831x_bat_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_CHARGE_TYPE, }; static const char *wm831x_bat_irqs[] = { "BATT HOT", "BATT COLD", "BATT FAIL", "OV", "END", "TO", "MODE", "START", }; static irqreturn_t wm831x_bat_irq(int irq, void *data) { struct wm831x_power *wm831x_power = data; struct wm831x *wm831x = wm831x_power->wm831x; dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq); /* The battery charger is autonomous so we don't need to do * anything except kick user space */ if (wm831x_power->have_battery) power_supply_changed(wm831x_power->battery); return IRQ_HANDLED; } /********************************************************************* * Initialisation *********************************************************************/ static irqreturn_t wm831x_syslo_irq(int irq, void *data) { struct wm831x_power *wm831x_power = data; struct wm831x *wm831x = wm831x_power->wm831x; /* 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; int ret, irq, i; power = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_power), GFP_KERNEL); if (power == NULL) return -ENOMEM; power->wm831x = wm831x; platform_set_drvdata(pdev, power); 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); power->wall_desc.name = power->wall_name; power->wall_desc.type = POWER_SUPPLY_TYPE_MAINS; power->wall_desc.properties = wm831x_wall_props; power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props); power->wall_desc.get_property = wm831x_wall_get_prop; power->wall = power_supply_register(&pdev->dev, &power->wall_desc, NULL); if (IS_ERR(power->wall)) { ret = PTR_ERR(power->wall); goto err; } power->usb_desc.name = power->usb_name, power->usb_desc.type = POWER_SUPPLY_TYPE_USB; power->usb_desc.properties = wm831x_usb_props; power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props); power->usb_desc.get_property = wm831x_usb_get_prop; power->usb = power_supply_register(&pdev->dev, &power->usb_desc, NULL); if (IS_ERR(power->usb)) { ret = PTR_ERR(power->usb); 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) { power->battery_desc.name = power->battery_name; power->battery_desc.properties = wm831x_bat_props; power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props); power->battery_desc.get_property = wm831x_bat_get_prop; power->battery_desc.use_for_apm = 1; power->battery = power_supply_register(&pdev->dev, &power->battery_desc, NULL); if (IS_ERR(power->battery)) { ret = PTR_ERR(power->battery); 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 | IRQF_ONESHOT, "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 | IRQF_ONESHOT, "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 | IRQF_ONESHOT, 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: --i; 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(power->battery); err_usb: power_supply_unregister(power->usb); err_wall: power_supply_unregister(power->wall); err: 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); 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");