drivers/power/ltc4088-charger.c - kernel/msm - Git at Google

 /*
  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
 #define pr_fmt(fmt)	"%s: " fmt, __func__

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/errno.h>
 #include <linux/power_supply.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
 #include <linux/power/ltc4088-charger.h>

 #define MAX_CURRENT_UA(n)	(n)
 #define MAX_CURRENT_MA(n)	(n * MAX_CURRENT_UA(1000))

 /**
  * ltc4088_max_current - A typical current values supported by the charger
  * @LTC4088_MAX_CURRENT_100mA:  100mA current
  * @LTC4088_MAX_CURRENT_500mA:  500mA current
  * @LTC4088_MAX_CURRENT_1A:     1A current
  */
 enum ltc4088_max_current {
 	LTC4088_MAX_CURRENT_100mA = 100,
 	LTC4088_MAX_CURRENT_500mA = 500,
 	LTC4088_MAX_CURRENT_1A = 1000,
 };

 /**
  * struct ltc4088_chg_chip - Device information
  * @dev:			Device pointer to access the parent
  * @lock:			Enable mutual exclusion
  * @usb_psy:			USB device information
  * @gpio_mode_select_d0:	GPIO #pin for D0 charger line
  * @gpio_mode_select_d1:	GPIO #pin for D1 charger line
  * @gpio_mode_select_d2:	GPIO #pin for D2 charger line
  * @max_current:		Maximum current that is supplied at this time
  */
 struct ltc4088_chg_chip {
 	struct device		*dev;
 	struct mutex		lock;
 	struct power_supply	usb_psy;
 	unsigned int		gpio_mode_select_d0;
 	unsigned int		gpio_mode_select_d1;
 	unsigned int		gpio_mode_select_d2;
 	unsigned int		max_current;
 };

 static enum power_supply_property pm_power_props[] = {
 	POWER_SUPPLY_PROP_CURRENT_MAX,
 	POWER_SUPPLY_PROP_ONLINE,
 };

 static char *pm_power_supplied_to[] = {
 	"battery",
 };

 static int ltc4088_set_charging(struct ltc4088_chg_chip *chip, bool enable)
 {
 	mutex_lock(&chip->lock);

 	if (enable) {
 		gpio_set_value_cansleep(chip->gpio_mode_select_d2, 0);
 	} else {
 		/* When disabling charger, set the max current to 0 also */
 		chip->max_current = 0;
 		gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d2, 1);
 	}

 	mutex_unlock(&chip->lock);

 	return 0;
 }

 static void ltc4088_set_max_current(struct ltc4088_chg_chip *chip, int value)
 {
 	mutex_lock(&chip->lock);

 	/* If current is less than 100mA, we can not support that granularity */
 	if (value <  MAX_CURRENT_MA(LTC4088_MAX_CURRENT_100mA)) {
 		chip->max_current = 0;
 		gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
 	} else if (value <  MAX_CURRENT_MA(LTC4088_MAX_CURRENT_500mA)) {
 		chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_100mA);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d0, 0);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d1, 0);
 	} else if (value <  MAX_CURRENT_MA(LTC4088_MAX_CURRENT_1A)) {
 		chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_500mA);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d0, 0);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
 	} else {
 		chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_1A);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
 		gpio_set_value_cansleep(chip->gpio_mode_select_d1, 0);
 	}

 	mutex_unlock(&chip->lock);
 }

 static void ltc4088_set_charging_off(struct ltc4088_chg_chip *chip)
 {
 	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
 	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
 }

 static int ltc4088_set_initial_state(struct ltc4088_chg_chip *chip)
 {
 	int rc;

 	rc = gpio_request(chip->gpio_mode_select_d0, "ltc4088_D0");
 	if (rc) {
 		pr_err("gpio request failed for GPIO %d\n",
 				chip->gpio_mode_select_d0);
 		return rc;
 	}

 	rc = gpio_request(chip->gpio_mode_select_d1, "ltc4088_D1");
 	if (rc) {
 		pr_err("gpio request failed for GPIO %d\n",
 				chip->gpio_mode_select_d1);
 		goto gpio_err_d0;
 	}

 	rc = gpio_request(chip->gpio_mode_select_d2, "ltc4088_D2");
 	if (rc) {
 		pr_err("gpio request failed for GPIO %d\n",
 				chip->gpio_mode_select_d2);
 		goto gpio_err_d1;
 	}

 	rc = gpio_direction_output(chip->gpio_mode_select_d0, 0);
 	if (rc) {
 		pr_err("failed to set direction for GPIO %d\n",
 				chip->gpio_mode_select_d0);
 		goto gpio_err_d2;
 	}

 	rc = gpio_direction_output(chip->gpio_mode_select_d1, 0);
 	if (rc) {
 		pr_err("failed to set direction for GPIO %d\n",
 				chip->gpio_mode_select_d1);
 		goto gpio_err_d2;
 	}

 	rc = gpio_direction_output(chip->gpio_mode_select_d2, 1);
 	if (rc) {
 		pr_err("failed to set direction for GPIO %d\n",
 				chip->gpio_mode_select_d2);
 		goto gpio_err_d2;
 	}

 	return 0;

 gpio_err_d2:
 	gpio_free(chip->gpio_mode_select_d2);
 gpio_err_d1:
 	gpio_free(chip->gpio_mode_select_d1);
 gpio_err_d0:
 	gpio_free(chip->gpio_mode_select_d0);
 	return rc;
 }

 static int pm_power_get_property(struct power_supply *psy,
 				  enum power_supply_property psp,
 				  union power_supply_propval *val)
 {
 	struct ltc4088_chg_chip *chip;

 	if (psy->type == POWER_SUPPLY_TYPE_USB) {
 		chip = container_of(psy, struct ltc4088_chg_chip,
 						usb_psy);
 		switch (psp) {
 		case POWER_SUPPLY_PROP_ONLINE:
 			if (chip->max_current)
 				val->intval = 1;
 			else
 				val->intval = 0;
 			break;
 		case POWER_SUPPLY_PROP_CURRENT_MAX:
 			val->intval = chip->max_current;
 			break;
 		default:
 			return -EINVAL;
 		}
 	}
 	return 0;
 }

 static int pm_power_set_property(struct power_supply *psy,
 				  enum power_supply_property psp,
 				  const union power_supply_propval *val)
 {
 	struct ltc4088_chg_chip *chip;

 	if (psy->type == POWER_SUPPLY_TYPE_USB) {
 		chip = container_of(psy, struct ltc4088_chg_chip, usb_psy);
 		switch (psp) {
 		case POWER_SUPPLY_PROP_TYPE:
 			psy.type = val->intval;
 			break;
 		case POWER_SUPPLY_PROP_ONLINE:
 			ltc4088_set_charging(chip, val->intval);
 			break;
 		case POWER_SUPPLY_PROP_CURRENT_MAX:
 			ltc4088_set_max_current(chip, val->intval);
 			break;
 		default:
 			return -EINVAL;
 		}
 	}
 	return 0;
 }

 static int ltc4088_charger_probe(struct platform_device *pdev)
 {
 	int rc;
 	struct ltc4088_chg_chip *chip;
 	const struct ltc4088_charger_platform_data *pdata
 			= pdev->dev.platform_data;

 	if (!pdata) {
 		pr_err("missing platform data\n");
 		return -EINVAL;
 	}

 	chip = kzalloc(sizeof(struct ltc4088_chg_chip),
 					GFP_KERNEL);
 	if (!chip) {
 		pr_err("Cannot allocate pm_chg_chip\n");
 		return -ENOMEM;
 	}

 	chip->dev = &pdev->dev;

 	if (pdata->gpio_mode_select_d0 < 0 ||
 		 pdata->gpio_mode_select_d1 < 0 ||
 		 pdata->gpio_mode_select_d2 < 0) {
 		pr_err("Invalid platform data supplied\n");
 		rc = -EINVAL;
 		goto free_chip;
 	}

 	mutex_init(&chip->lock);

 	chip->gpio_mode_select_d0 = pdata->gpio_mode_select_d0;
 	chip->gpio_mode_select_d1 = pdata->gpio_mode_select_d1;
 	chip->gpio_mode_select_d2 = pdata->gpio_mode_select_d2;

 	chip->usb_psy.name = "usb",
 	chip->usb_psy.type = POWER_SUPPLY_TYPE_USB,
 	chip->usb_psy.supplied_to = pm_power_supplied_to,
 	chip->usb_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to),
 	chip->usb_psy.properties = pm_power_props,
 	chip->usb_psy.num_properties = ARRAY_SIZE(pm_power_props),
 	chip->usb_psy.get_property = pm_power_get_property,
 	chip->usb_psy.set_property = pm_power_set_property,

 	rc = power_supply_register(chip->dev, &chip->usb_psy);
 	if (rc < 0) {
 		pr_err("power_supply_register usb failed rc = %d\n", rc);
 		goto free_chip;
 	}

 	platform_set_drvdata(pdev, chip);

 	rc = ltc4088_set_initial_state(chip);
 	if (rc < 0) {
 		pr_err("setting initial state failed rc = %d\n", rc);
 		goto unregister_usb;
 	}

 	return 0;

 unregister_usb:
 	platform_set_drvdata(pdev, NULL);
 	power_supply_unregister(&chip->usb_psy);
 free_chip:
 	kfree(chip);

 	return rc;
 }

 static int ltc4088_charger_remove(struct platform_device *pdev)
 {
 	struct ltc4088_chg_chip *chip = platform_get_drvdata(pdev);

 	ltc4088_set_charging_off(chip);

 	gpio_free(chip->gpio_mode_select_d2);
 	gpio_free(chip->gpio_mode_select_d1);
 	gpio_free(chip->gpio_mode_select_d0);

 	power_supply_unregister(&chip->usb_psy);

 	platform_set_drvdata(pdev, NULL);
 	mutex_destroy(&chip->lock);
 	kfree(chip);

 	return 0;
 }

 static struct platform_driver ltc4088_charger_driver = {
 	.probe	= ltc4088_charger_probe,
 	.remove	= ltc4088_charger_remove,
 	.driver	= {
 		.name	= LTC4088_CHARGER_DEV_NAME,
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init ltc4088_charger_init(void)
 {
 	return platform_driver_register(&ltc4088_charger_driver);
 }

 static void __exit ltc4088_charger_exit(void)
 {
 	platform_driver_unregister(&ltc4088_charger_driver);
 }

 subsys_initcall(ltc4088_charger_init);
 module_exit(ltc4088_charger_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("LTC4088 charger/battery driver");
 MODULE_VERSION("1.0");
 MODULE_ALIAS("platform:" LTC4088_CHARGER_DEV_NAME);
	/*
	* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/
	#define pr_fmt(fmt) "%s: " fmt, __func__

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/errno.h>
	#include <linux/power_supply.h>
	#include <linux/slab.h>
	#include <linux/gpio.h>
	#include <linux/power/ltc4088-charger.h>

	#define MAX_CURRENT_UA(n) (n)
	#define MAX_CURRENT_MA(n) (n * MAX_CURRENT_UA(1000))

	/**
	* ltc4088_max_current - A typical current values supported by the charger
	* @LTC4088_MAX_CURRENT_100mA: 100mA current
	* @LTC4088_MAX_CURRENT_500mA: 500mA current
	* @LTC4088_MAX_CURRENT_1A: 1A current
	*/
	enum ltc4088_max_current {
	LTC4088_MAX_CURRENT_100mA = 100,
	LTC4088_MAX_CURRENT_500mA = 500,
	LTC4088_MAX_CURRENT_1A = 1000,
	};

	/**
	* struct ltc4088_chg_chip - Device information
	* @dev: Device pointer to access the parent
	* @lock: Enable mutual exclusion
	* @usb_psy: USB device information
	* @gpio_mode_select_d0: GPIO #pin for D0 charger line
	* @gpio_mode_select_d1: GPIO #pin for D1 charger line
	* @gpio_mode_select_d2: GPIO #pin for D2 charger line
	* @max_current: Maximum current that is supplied at this time
	*/
	struct ltc4088_chg_chip {
	struct device *dev;
	struct mutex lock;
	struct power_supply usb_psy;
	unsigned int gpio_mode_select_d0;
	unsigned int gpio_mode_select_d1;
	unsigned int gpio_mode_select_d2;
	unsigned int max_current;
	};

	static enum power_supply_property pm_power_props[] = {
	POWER_SUPPLY_PROP_CURRENT_MAX,
	POWER_SUPPLY_PROP_ONLINE,
	};

	static char *pm_power_supplied_to[] = {
	"battery",
	};

	static int ltc4088_set_charging(struct ltc4088_chg_chip *chip, bool enable)
	{
	mutex_lock(&chip->lock);

	if (enable) {
	gpio_set_value_cansleep(chip->gpio_mode_select_d2, 0);
	} else {
	/* When disabling charger, set the max current to 0 also */
	chip->max_current = 0;
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
	gpio_set_value_cansleep(chip->gpio_mode_select_d2, 1);
	}

	mutex_unlock(&chip->lock);

	return 0;
	}

	static void ltc4088_set_max_current(struct ltc4088_chg_chip *chip, int value)
	{
	mutex_lock(&chip->lock);

	/* If current is less than 100mA, we can not support that granularity */
	if (value < MAX_CURRENT_MA(LTC4088_MAX_CURRENT_100mA)) {
	chip->max_current = 0;
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
	} else if (value < MAX_CURRENT_MA(LTC4088_MAX_CURRENT_500mA)) {
	chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_100mA);
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 0);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 0);
	} else if (value < MAX_CURRENT_MA(LTC4088_MAX_CURRENT_1A)) {
	chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_500mA);
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 0);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
	} else {
	chip->max_current = MAX_CURRENT_MA(LTC4088_MAX_CURRENT_1A);
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 0);
	}

	mutex_unlock(&chip->lock);
	}

	static void ltc4088_set_charging_off(struct ltc4088_chg_chip *chip)
	{
	gpio_set_value_cansleep(chip->gpio_mode_select_d0, 1);
	gpio_set_value_cansleep(chip->gpio_mode_select_d1, 1);
	}

	static int ltc4088_set_initial_state(struct ltc4088_chg_chip *chip)
	{
	int rc;

	rc = gpio_request(chip->gpio_mode_select_d0, "ltc4088_D0");
	if (rc) {
	pr_err("gpio request failed for GPIO %d\n",
	chip->gpio_mode_select_d0);
	return rc;
	}

	rc = gpio_request(chip->gpio_mode_select_d1, "ltc4088_D1");
	if (rc) {
	pr_err("gpio request failed for GPIO %d\n",
	chip->gpio_mode_select_d1);
	goto gpio_err_d0;
	}

	rc = gpio_request(chip->gpio_mode_select_d2, "ltc4088_D2");
	if (rc) {
	pr_err("gpio request failed for GPIO %d\n",
	chip->gpio_mode_select_d2);
	goto gpio_err_d1;
	}

	rc = gpio_direction_output(chip->gpio_mode_select_d0, 0);
	if (rc) {
	pr_err("failed to set direction for GPIO %d\n",
	chip->gpio_mode_select_d0);
	goto gpio_err_d2;
	}

	rc = gpio_direction_output(chip->gpio_mode_select_d1, 0);
	if (rc) {
	pr_err("failed to set direction for GPIO %d\n",
	chip->gpio_mode_select_d1);
	goto gpio_err_d2;
	}

	rc = gpio_direction_output(chip->gpio_mode_select_d2, 1);
	if (rc) {
	pr_err("failed to set direction for GPIO %d\n",
	chip->gpio_mode_select_d2);
	goto gpio_err_d2;
	}

	return 0;

	gpio_err_d2:
	gpio_free(chip->gpio_mode_select_d2);
	gpio_err_d1:
	gpio_free(chip->gpio_mode_select_d1);
	gpio_err_d0:
	gpio_free(chip->gpio_mode_select_d0);
	return rc;
	}

	static int pm_power_get_property(struct power_supply *psy,
	enum power_supply_property psp,
	union power_supply_propval *val)
	{
	struct ltc4088_chg_chip *chip;

	if (psy->type == POWER_SUPPLY_TYPE_USB) {
	chip = container_of(psy, struct ltc4088_chg_chip,
	usb_psy);
	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
	if (chip->max_current)
	val->intval = 1;
	else
	val->intval = 0;
	break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
	val->intval = chip->max_current;
	break;
	default:
	return -EINVAL;
	}
	}
	return 0;
	}

	static int pm_power_set_property(struct power_supply *psy,
	enum power_supply_property psp,
	const union power_supply_propval *val)
	{
	struct ltc4088_chg_chip *chip;

	if (psy->type == POWER_SUPPLY_TYPE_USB) {
	chip = container_of(psy, struct ltc4088_chg_chip, usb_psy);
	switch (psp) {
	case POWER_SUPPLY_PROP_TYPE:
	psy.type = val->intval;
	break;
	case POWER_SUPPLY_PROP_ONLINE:
	ltc4088_set_charging(chip, val->intval);
	break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
	ltc4088_set_max_current(chip, val->intval);
	break;
	default:
	return -EINVAL;
	}
	}
	return 0;
	}

	static int ltc4088_charger_probe(struct platform_device *pdev)
	{
	int rc;
	struct ltc4088_chg_chip *chip;
	const struct ltc4088_charger_platform_data *pdata
	= pdev->dev.platform_data;

	if (!pdata) {
	pr_err("missing platform data\n");
	return -EINVAL;
	}

	chip = kzalloc(sizeof(struct ltc4088_chg_chip),
	GFP_KERNEL);
	if (!chip) {
	pr_err("Cannot allocate pm_chg_chip\n");
	return -ENOMEM;
	}

	chip->dev = &pdev->dev;

	if (pdata->gpio_mode_select_d0 < 0 \|\|
	pdata->gpio_mode_select_d1 < 0 \|\|
	pdata->gpio_mode_select_d2 < 0) {
	pr_err("Invalid platform data supplied\n");
	rc = -EINVAL;
	goto free_chip;
	}

	mutex_init(&chip->lock);

	chip->gpio_mode_select_d0 = pdata->gpio_mode_select_d0;
	chip->gpio_mode_select_d1 = pdata->gpio_mode_select_d1;
	chip->gpio_mode_select_d2 = pdata->gpio_mode_select_d2;

	chip->usb_psy.name = "usb",
	chip->usb_psy.type = POWER_SUPPLY_TYPE_USB,
	chip->usb_psy.supplied_to = pm_power_supplied_to,
	chip->usb_psy.num_supplicants = ARRAY_SIZE(pm_power_supplied_to),
	chip->usb_psy.properties = pm_power_props,
	chip->usb_psy.num_properties = ARRAY_SIZE(pm_power_props),
	chip->usb_psy.get_property = pm_power_get_property,
	chip->usb_psy.set_property = pm_power_set_property,

	rc = power_supply_register(chip->dev, &chip->usb_psy);
	if (rc < 0) {
	pr_err("power_supply_register usb failed rc = %d\n", rc);
	goto free_chip;
	}

	platform_set_drvdata(pdev, chip);

	rc = ltc4088_set_initial_state(chip);
	if (rc < 0) {
	pr_err("setting initial state failed rc = %d\n", rc);
	goto unregister_usb;
	}

	return 0;

	unregister_usb:
	platform_set_drvdata(pdev, NULL);
	power_supply_unregister(&chip->usb_psy);
	free_chip:
	kfree(chip);

	return rc;
	}

	static int ltc4088_charger_remove(struct platform_device *pdev)
	{
	struct ltc4088_chg_chip *chip = platform_get_drvdata(pdev);

	ltc4088_set_charging_off(chip);

	gpio_free(chip->gpio_mode_select_d2);
	gpio_free(chip->gpio_mode_select_d1);
	gpio_free(chip->gpio_mode_select_d0);

	power_supply_unregister(&chip->usb_psy);

	platform_set_drvdata(pdev, NULL);
	mutex_destroy(&chip->lock);
	kfree(chip);

	return 0;
	}

	static struct platform_driver ltc4088_charger_driver = {
	.probe = ltc4088_charger_probe,
	.remove = ltc4088_charger_remove,
	.driver = {
	.name = LTC4088_CHARGER_DEV_NAME,
	.owner = THIS_MODULE,
	},
	};

	static int __init ltc4088_charger_init(void)
	{
	return platform_driver_register(&ltc4088_charger_driver);
	}

	static void __exit ltc4088_charger_exit(void)
	{
	platform_driver_unregister(&ltc4088_charger_driver);
	}

	subsys_initcall(ltc4088_charger_init);
	module_exit(ltc4088_charger_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("LTC4088 charger/battery driver");
	MODULE_VERSION("1.0");
	MODULE_ALIAS("platform:" LTC4088_CHARGER_DEV_NAME);