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Message-Id: <1287541031-17409-1-git-send-email-rklein@nvidia.com>
Date: Tue, 19 Oct 2010 19:17:11 -0700
From: rklein@...dia.com
To: cboutatmailru@...il.com
Cc: achew@...dia.com, olof@...om.net, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, Rhyland Klein <rklein@...dia.com>
Subject: [PATCH 1/1] power: bq24617: Adding initial charger support
From: Rhyland Klein <rklein@...dia.com>
Initial checkin adding basic support for the TI BQ24617 battery charger on the
Nvidia Tegra architecture.
Signed-off-by: Rhyland Klein <rklein@...dia.com>
---
drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/tegra_bq24617.c | 259 +++++++++++++++++++++++++++++++++++++++++
include/linux/tegra_bq24617.h | 10 ++
4 files changed, 277 insertions(+), 0 deletions(-)
create mode 100644 drivers/power/tegra_bq24617.c
create mode 100644 include/linux/tegra_bq24617.h
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 60d83d9..cec4a63 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -185,4 +185,11 @@ config CHARGER_TWL4030
help
Say Y here to enable support for TWL4030 Battery Charge Interface.
+config CHARGER_BQ24617_TEGRA
+ tristate "BQ24617 Tegra battery charger"
+ depends on I2C && ARCH_TEGRA
+ help
+ Say Y to include support for the TI BQ24617 battery charger on
+ the Nvidia Tegra platform.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index c75772e..95d8163 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
+obj-$(CONFIG_CHARGER_BQ24617_TEGRA) += tegra_bq24617.o
diff --git a/drivers/power/tegra_bq24617.c b/drivers/power/tegra_bq24617.c
new file mode 100644
index 0000000..02c8a76
--- /dev/null
+++ b/drivers/power/tegra_bq24617.c
@@ -0,0 +1,259 @@
+/*
+ * Charger driver for TI's BQ24617
+ *
+ * Copyright (c) 2010, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/tegra_bq24617.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+struct bq24617_info {
+ struct power_supply power_supply;
+ struct bq24617_platform_data *pdata;
+ struct platform_device *pdev;
+ struct mutex work_lock;
+ struct work_struct ac_work;
+ int status;
+};
+
+static enum power_supply_property bq24617_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static void bq24617_batt_update(struct bq24617_info *chip)
+{
+ int old_status = chip->status;
+ int new_status = old_status;
+ struct bq24617_platform_data *pdata;
+ int gpio_value = 0;
+
+ pdata = chip->pdata;
+
+ mutex_lock(&chip->work_lock);
+
+ gpio_value = gpio_get_value(pdata->gpio_addr);
+
+ new_status = !gpio_value;
+ chip->status = new_status;
+
+ mutex_unlock(&chip->work_lock);
+
+ if (old_status != -1 &&
+ old_status != new_status) {
+ dev_dbg(&chip->pdev->dev,
+ "%s: %i -> %i\n", __func__, old_status,
+ new_status);
+ kobject_uevent(&chip->power_supply.dev->kobj, KOBJ_CHANGE);
+ }
+
+}
+
+static irqreturn_t bq24617_irq_switch(int irq, void *devid)
+{
+ struct bq24617_info *chip = devid;
+
+ schedule_work(&chip->ac_work);
+
+ return IRQ_HANDLED;
+}
+
+static int bq24617_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct bq24617_info *chip = container_of(psy, struct bq24617_info,
+ power_supply);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ bq24617_batt_update(chip);
+ val->intval = chip->status;
+ break;
+ default:
+ dev_err(&chip->pdev->dev,
+ "%s: Unknown property requested.\n", __func__);
+ return -EINVAL;
+ break;
+ }
+ return 0;
+}
+
+static void bq24617_ac_work(struct work_struct *work)
+{
+ struct bq24617_info *chip;
+ chip = container_of(work, struct bq24617_info, ac_work);
+ bq24617_batt_update(chip);
+}
+
+static int bq24617_probe(struct platform_device *pdev)
+{
+ struct bq24617_info *chip;
+ struct bq24617_platform_data *pdata = pdev->dev.platform_data;
+ int rc;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data\n");
+ return -ENXIO;
+ }
+
+ if (!(gpio_is_valid(pdata->gpio_addr))) {
+ dev_err(&pdev->dev, "Gpio is not valid\n");
+ return -EINVAL;
+ }
+
+ chip = kzalloc(sizeof(struct bq24617_info), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->pdata = pdata;
+ chip->pdev = pdev;
+ chip->power_supply.name = "ac";
+ chip->status = -1; /* set status to reflect unset */
+ chip->power_supply.type = POWER_SUPPLY_TYPE_MAINS;
+ chip->power_supply.properties = bq24617_properties;
+ chip->power_supply.num_properties = ARRAY_SIZE(bq24617_properties);
+ chip->power_supply.get_property = bq24617_get_property;
+ chip->power_supply.supplied_to = pdata->batteries;
+ chip->power_supply.num_supplicants = pdata->num_batteries;
+
+ mutex_init(&chip->work_lock);
+
+ platform_set_drvdata(pdev, chip);
+
+ rc = gpio_request(pdata->gpio_addr, "ac online");
+ if (rc) {
+ dev_err(&pdev->dev,
+ "%s: Failed to get gpio\n", __func__);
+ goto free_chip;
+ }
+
+ gpio_direction_input(pdata->gpio_addr);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "%s: Failed to set gpio direction\n",
+ __func__);
+ goto release_gpio;
+ }
+
+ rc = request_irq(gpio_to_irq(pdata->gpio_addr),
+ bq24617_irq_switch,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "ac detect", chip);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "%s: Failed to request IRQ\n", __func__);
+ goto release_gpio;
+ }
+
+ INIT_WORK(&chip->ac_work, bq24617_ac_work);
+
+ rc = power_supply_register(&pdev->dev, &chip->power_supply);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "%s: Failed to register power supply\n", __func__);
+ goto free_irq;
+ }
+
+ dev_info(&pdev->dev,
+ "%s: battery charger ac device registered\n", pdev->name);
+
+ schedule_work(&chip->ac_work);
+
+ return 0;
+
+free_irq:
+ free_irq(gpio_to_irq(pdata->gpio_addr), chip);
+release_gpio:
+ gpio_free(pdata->gpio_addr);
+free_chip:
+ kfree(chip);
+ return rc;
+}
+
+static int bq24617_remove(struct platform_device *pdev)
+{
+ struct bq24617_info *chip = platform_get_drvdata(pdev);
+ struct bq24617_platform_data *pdata = chip->pdata;
+
+ flush_scheduled_work();
+
+ power_supply_unregister(&chip->power_supply);
+
+ free_irq(gpio_to_irq(pdata->gpio_addr), chip);
+ gpio_free(pdata->gpio_addr);
+ kfree(chip);
+
+ return 0;
+}
+
+#if CONFIG_PM
+static int bq24617_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ flush_scheduled_work();
+
+ return 0;
+}
+
+static int bq24617_resume(struct platform_device *pdev)
+{
+ struct bq24617_info *chip = platform_get_drvdata(pdev);
+
+ schedule_work(&chip->ac_work);
+
+ return 0;
+}
+
+#else
+#define bq24617_suspend NULL
+#define bq24617_resume NULL
+#endif
+
+static struct platform_driver bq24617_driver = {
+ .driver = {
+ .name = "tegra-bq24617",
+ .owner = THIS_MODULE,
+ },
+ .probe = bq24617_probe,
+ .remove = __devexit_p(bq24617_remove),
+ .suspend = bq24617_suspend,
+ .resume = bq24617_resume,
+};
+
+static int __devinit bq24617_init(void)
+{
+ return platform_driver_register(&bq24617_driver);
+}
+module_init(bq24617_init);
+
+static void __devexit bq24617_exit(void)
+{
+ platform_driver_unregister(&bq24617_driver);
+}
+module_exit(bq24617_exit);
+
+MODULE_AUTHOR("Rhyland Klein <rklein@...dia.com");
+MODULE_DESCRIPTION("BQ24617 battery charger driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/tegra_bq24617.h b/include/linux/tegra_bq24617.h
new file mode 100644
index 0000000..4c58406
--- /dev/null
+++ b/include/linux/tegra_bq24617.h
@@ -0,0 +1,10 @@
+#ifndef _LINUX_BQ24617_H
+#define _LINUX_BQ24617_H
+
+struct bq24617_platform_data {
+ int gpio_addr;
+ char **batteries;
+ int num_batteries;
+};
+
+#endif
--
1.7.0.4
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