Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Driver for chargers which report their online status through a GPIO pin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/power_supply.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/power/gpio-charger.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) struct gpio_mapping {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	u32 limit_ua;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	u32 gpiodata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) struct gpio_charger {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	unsigned int charge_status_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	bool wakeup_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct power_supply *charger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct power_supply_desc charger_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct gpio_desc *gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct gpio_desc *charge_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct gpio_descs *current_limit_gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct gpio_mapping *current_limit_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	u32 current_limit_map_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	u32 charge_current_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static irqreturn_t gpio_charger_irq(int irq, void *devid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	struct power_supply *charger = devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	power_supply_changed(charger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	return power_supply_get_drvdata(psy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static int set_charge_current_limit(struct gpio_charger *gpio_charger, int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct gpio_mapping mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int ndescs = gpio_charger->current_limit_gpios->ndescs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	struct gpio_desc **gpios = gpio_charger->current_limit_gpios->desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (!gpio_charger->current_limit_map_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	for (i = 0; i < gpio_charger->current_limit_map_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		if (gpio_charger->current_limit_map[i].limit_ua <= val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	mapping = gpio_charger->current_limit_map[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	for (i = 0; i < ndescs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		bool val = (mapping.gpiodata >> i) & 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		gpiod_set_value_cansleep(gpios[ndescs-i-1], val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	gpio_charger->charge_current_limit = mapping.limit_ua;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	dev_dbg(gpio_charger->dev, "set charge current limit to %d (requested: %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		gpio_charger->charge_current_limit, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static int gpio_charger_get_property(struct power_supply *psy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		enum power_supply_property psp, union power_supply_propval *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	switch (psp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	case POWER_SUPPLY_PROP_ONLINE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	case POWER_SUPPLY_PROP_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		if (gpiod_get_value_cansleep(gpio_charger->charge_status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		val->intval = gpio_charger->charge_current_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int gpio_charger_set_property(struct power_supply *psy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	enum power_supply_property psp, const union power_supply_propval *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	switch (psp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return set_charge_current_limit(gpio_charger, val->intval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int gpio_charger_property_is_writeable(struct power_supply *psy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 					      enum power_supply_property psp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	switch (psp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static enum power_supply_type gpio_charger_get_type(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	const char *chargetype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (!device_property_read_string(dev, "charger-type", &chargetype)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (!strcmp("unknown", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			return POWER_SUPPLY_TYPE_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		if (!strcmp("battery", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			return POWER_SUPPLY_TYPE_BATTERY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if (!strcmp("ups", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			return POWER_SUPPLY_TYPE_UPS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (!strcmp("mains", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			return POWER_SUPPLY_TYPE_MAINS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		if (!strcmp("usb-sdp", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			return POWER_SUPPLY_TYPE_USB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		if (!strcmp("usb-dcp", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			return POWER_SUPPLY_TYPE_USB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (!strcmp("usb-cdp", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			return POWER_SUPPLY_TYPE_USB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		if (!strcmp("usb-aca", chargetype))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			return POWER_SUPPLY_TYPE_USB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	dev_warn(dev, "unknown charger type %s\n", chargetype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return POWER_SUPPLY_TYPE_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static int gpio_charger_get_irq(struct device *dev, void *dev_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 				struct gpio_desc *gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	int ret, irq = gpiod_to_irq(gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (irq > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		ret = devm_request_any_context_irq(dev, irq, gpio_charger_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 						   IRQF_TRIGGER_RISING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 						   IRQF_TRIGGER_FALLING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 						   dev_name(dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 						   dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			dev_warn(dev, "Failed to request irq: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			irq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	return irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static int init_charge_current_limit(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				    struct gpio_charger *gpio_charger)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	int i, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	u32 cur_limit = U32_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	gpio_charger->current_limit_gpios = devm_gpiod_get_array_optional(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		"charge-current-limit", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (IS_ERR(gpio_charger->current_limit_gpios)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		dev_err(dev, "error getting current-limit GPIOs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		return PTR_ERR(gpio_charger->current_limit_gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (!gpio_charger->current_limit_gpios)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (len == 0 || len % 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		dev_err(dev, "invalid charge-current-limit-mapping length\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	gpio_charger->current_limit_map = devm_kmalloc_array(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		len / 2, sizeof(*gpio_charger->current_limit_map), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (!gpio_charger->current_limit_map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	gpio_charger->current_limit_map_size = len / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	len = device_property_read_u32_array(dev, "charge-current-limit-mapping",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		(u32*) gpio_charger->current_limit_map, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	for (i=0; i < gpio_charger->current_limit_map_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (gpio_charger->current_limit_map[i].limit_ua > cur_limit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			dev_err(dev, "charge-current-limit-mapping not sorted by current in descending order\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		cur_limit = gpio_charger->current_limit_map[i].limit_ua;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	/* default to smallest current limitation for safety reasons */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	len = gpio_charger->current_limit_map_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	set_charge_current_limit(gpio_charger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		gpio_charger->current_limit_map[len].limit_ua);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  * The entries will be overwritten by driver's probe routine depending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  * on the available features. This list ensures, that the array is big
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)  * enough for all optional features.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static enum power_supply_property gpio_charger_properties[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	POWER_SUPPLY_PROP_ONLINE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	POWER_SUPPLY_PROP_STATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static int gpio_charger_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	const struct gpio_charger_platform_data *pdata = dev->platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct power_supply_config psy_cfg = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct gpio_charger *gpio_charger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	struct power_supply_desc *charger_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct gpio_desc *charge_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	int charge_status_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int num_props = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (!pdata && !dev->of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		dev_err(dev, "No platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	gpio_charger = devm_kzalloc(dev, sizeof(*gpio_charger), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (!gpio_charger)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	gpio_charger->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	 * This will fetch a GPIO descriptor from device tree, ACPI or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	 * boardfile descriptor tables. It's good to try this first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (IS_ERR(gpio_charger->gpiod)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		/* Just try again if this happens */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		return dev_err_probe(dev, PTR_ERR(gpio_charger->gpiod),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 				     "error getting GPIO descriptor\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (gpio_charger->gpiod) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_ONLINE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		num_props++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (IS_ERR(charge_status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		return PTR_ERR(charge_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (charge_status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		gpio_charger->charge_status = charge_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_STATUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		num_props++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	ret = init_charge_current_limit(dev, gpio_charger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (gpio_charger->current_limit_map) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		gpio_charger_properties[num_props] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		num_props++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	charger_desc = &gpio_charger->charger_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	charger_desc->properties = gpio_charger_properties;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	charger_desc->num_properties = num_props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	charger_desc->get_property = gpio_charger_get_property;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	charger_desc->set_property = gpio_charger_set_property;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	charger_desc->property_is_writeable =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 					gpio_charger_property_is_writeable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	psy_cfg.of_node = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	psy_cfg.drv_data = gpio_charger;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		charger_desc->name = pdata->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		charger_desc->type = pdata->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		psy_cfg.supplied_to = pdata->supplied_to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		psy_cfg.num_supplicants = pdata->num_supplicants;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		charger_desc->name = dev->of_node->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		charger_desc->type = gpio_charger_get_type(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (!charger_desc->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		charger_desc->name = pdev->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 							   &psy_cfg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	if (IS_ERR(gpio_charger->charger)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		ret = PTR_ERR(gpio_charger->charger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		dev_err(dev, "Failed to register power supply: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	gpio_charger->irq = gpio_charger_get_irq(dev, gpio_charger->charger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 						 gpio_charger->gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	charge_status_irq = gpio_charger_get_irq(dev, gpio_charger->charger,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 						 gpio_charger->charge_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	gpio_charger->charge_status_irq = charge_status_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	platform_set_drvdata(pdev, gpio_charger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	device_init_wakeup(dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static int gpio_charger_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (device_may_wakeup(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		gpio_charger->wakeup_enabled =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			!enable_irq_wake(gpio_charger->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) static int gpio_charger_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		disable_irq_wake(gpio_charger->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	power_supply_changed(gpio_charger->charger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		gpio_charger_suspend, gpio_charger_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static const struct of_device_id gpio_charger_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	{ .compatible = "gpio-charger" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) MODULE_DEVICE_TABLE(of, gpio_charger_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static struct platform_driver gpio_charger_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	.probe = gpio_charger_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		.name = "gpio-charger",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		.pm = &gpio_charger_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		.of_match_table = gpio_charger_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) module_platform_driver(gpio_charger_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) MODULE_DESCRIPTION("Driver for chargers only communicating via GPIO(s)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) MODULE_ALIAS("platform:gpio-charger");