297 lines
8.1 KiB
C
297 lines
8.1 KiB
C
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/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* Driver for chargers which report their online status through a GPIO pin
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/device.h>
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#include <linux/gpio.h> /* For legacy platform data */
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/gpio/consumer.h>
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#include <linux/power/gpio-charger.h>
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struct gpio_charger {
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const struct gpio_charger_platform_data *pdata;
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unsigned int irq;
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bool wakeup_enabled;
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struct power_supply *charger;
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struct power_supply_desc charger_desc;
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struct gpio_desc *gpiod;
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bool legacy_gpio_requested;
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};
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static irqreturn_t gpio_charger_irq(int irq, void *devid)
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{
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struct power_supply *charger = devid;
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power_supply_changed(charger);
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return IRQ_HANDLED;
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}
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static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
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{
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return power_supply_get_drvdata(psy);
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}
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static int gpio_charger_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
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const struct gpio_charger_platform_data *pdata = gpio_charger->pdata;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
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/* This xor is only ever used with legacy pdata GPIO */
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val->intval ^= pdata->gpio_active_low;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property gpio_charger_properties[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static
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struct gpio_charger_platform_data *gpio_charger_parse_dt(struct device *dev)
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{
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struct device_node *np = dev->of_node;
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struct gpio_charger_platform_data *pdata;
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const char *chargetype;
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int ret;
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if (!np)
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return ERR_PTR(-ENOENT);
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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pdata->name = np->name;
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pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
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ret = of_property_read_string(np, "charger-type", &chargetype);
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if (ret >= 0) {
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if (!strncmp("unknown", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_UNKNOWN;
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else if (!strncmp("battery", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_BATTERY;
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else if (!strncmp("ups", chargetype, 3))
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pdata->type = POWER_SUPPLY_TYPE_UPS;
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else if (!strncmp("mains", chargetype, 5))
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pdata->type = POWER_SUPPLY_TYPE_MAINS;
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else if (!strncmp("usb-sdp", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_USB;
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else if (!strncmp("usb-dcp", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_USB_DCP;
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else if (!strncmp("usb-cdp", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_USB_CDP;
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else if (!strncmp("usb-aca", chargetype, 7))
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pdata->type = POWER_SUPPLY_TYPE_USB_ACA;
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else
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dev_warn(dev, "unknown charger type %s\n", chargetype);
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}
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return pdata;
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}
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static int gpio_charger_probe(struct platform_device *pdev)
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{
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const struct gpio_charger_platform_data *pdata = pdev->dev.platform_data;
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struct power_supply_config psy_cfg = {};
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struct gpio_charger *gpio_charger;
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struct power_supply_desc *charger_desc;
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int ret;
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int irq;
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if (!pdata) {
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pdata = gpio_charger_parse_dt(&pdev->dev);
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if (IS_ERR(pdata)) {
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ret = PTR_ERR(pdata);
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev, "No platform data\n");
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return ret;
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}
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}
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gpio_charger = devm_kzalloc(&pdev->dev, sizeof(*gpio_charger),
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GFP_KERNEL);
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if (!gpio_charger) {
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dev_err(&pdev->dev, "Failed to alloc driver structure\n");
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return -ENOMEM;
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}
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/*
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* This will fetch a GPIO descriptor from device tree, ACPI or
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* boardfile descriptor tables. It's good to try this first.
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*/
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gpio_charger->gpiod = devm_gpiod_get(&pdev->dev, NULL, GPIOD_IN);
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/*
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* If this fails and we're not using device tree, try the
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* legacy platform data method.
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*/
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if (IS_ERR(gpio_charger->gpiod) && !pdev->dev.of_node) {
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/* Non-DT: use legacy GPIO numbers */
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if (!gpio_is_valid(pdata->gpio)) {
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dev_err(&pdev->dev, "Invalid gpio pin in pdata\n");
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return -EINVAL;
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}
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ret = gpio_request(pdata->gpio, dev_name(&pdev->dev));
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if (ret) {
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dev_err(&pdev->dev, "Failed to request gpio pin: %d\n",
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ret);
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return ret;
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}
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gpio_charger->legacy_gpio_requested = true;
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ret = gpio_direction_input(pdata->gpio);
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if (ret) {
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dev_err(&pdev->dev, "Failed to set gpio to input: %d\n",
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ret);
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goto err_gpio_free;
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}
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/* Then convert this to gpiod for now */
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gpio_charger->gpiod = gpio_to_desc(pdata->gpio);
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} else if (IS_ERR(gpio_charger->gpiod)) {
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/* Just try again if this happens */
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if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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dev_err(&pdev->dev, "error getting GPIO descriptor\n");
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return PTR_ERR(gpio_charger->gpiod);
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}
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charger_desc = &gpio_charger->charger_desc;
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charger_desc->name = pdata->name ? pdata->name : "gpio-charger";
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charger_desc->type = pdata->type;
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charger_desc->properties = gpio_charger_properties;
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charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
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charger_desc->get_property = gpio_charger_get_property;
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psy_cfg.supplied_to = pdata->supplied_to;
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psy_cfg.num_supplicants = pdata->num_supplicants;
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psy_cfg.of_node = pdev->dev.of_node;
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psy_cfg.drv_data = gpio_charger;
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gpio_charger->pdata = pdata;
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gpio_charger->charger = power_supply_register(&pdev->dev,
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charger_desc, &psy_cfg);
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if (IS_ERR(gpio_charger->charger)) {
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ret = PTR_ERR(gpio_charger->charger);
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dev_err(&pdev->dev, "Failed to register power supply: %d\n",
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ret);
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goto err_gpio_free;
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}
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irq = gpiod_to_irq(gpio_charger->gpiod);
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if (irq > 0) {
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ret = request_any_context_irq(irq, gpio_charger_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), gpio_charger->charger);
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if (ret < 0)
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dev_warn(&pdev->dev, "Failed to request irq: %d\n", ret);
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else
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gpio_charger->irq = irq;
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}
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platform_set_drvdata(pdev, gpio_charger);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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err_gpio_free:
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if (gpio_charger->legacy_gpio_requested)
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gpio_free(pdata->gpio);
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return ret;
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}
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static int gpio_charger_remove(struct platform_device *pdev)
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{
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struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
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if (gpio_charger->irq)
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free_irq(gpio_charger->irq, gpio_charger->charger);
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power_supply_unregister(gpio_charger->charger);
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if (gpio_charger->legacy_gpio_requested)
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gpio_free(gpio_charger->pdata->gpio);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int gpio_charger_suspend(struct device *dev)
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{
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struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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gpio_charger->wakeup_enabled =
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!enable_irq_wake(gpio_charger->irq);
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return 0;
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}
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static int gpio_charger_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct gpio_charger *gpio_charger = platform_get_drvdata(pdev);
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if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
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disable_irq_wake(gpio_charger->irq);
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power_supply_changed(gpio_charger->charger);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
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gpio_charger_suspend, gpio_charger_resume);
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static const struct of_device_id gpio_charger_match[] = {
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{ .compatible = "gpio-charger" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, gpio_charger_match);
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static struct platform_driver gpio_charger_driver = {
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.probe = gpio_charger_probe,
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.remove = gpio_charger_remove,
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.driver = {
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.name = "gpio-charger",
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.pm = &gpio_charger_pm_ops,
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.of_match_table = gpio_charger_match,
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},
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};
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module_platform_driver(gpio_charger_driver);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:gpio-charger");
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