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path: root/kernel/drivers/gpio/gpio-tps6586x.c
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Diffstat (limited to 'kernel/drivers/gpio/gpio-tps6586x.c')
-rw-r--r--kernel/drivers/gpio/gpio-tps6586x.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/kernel/drivers/gpio/gpio-tps6586x.c b/kernel/drivers/gpio/gpio-tps6586x.c
new file mode 100644
index 000000000..9c9238e83
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-tps6586x.c
@@ -0,0 +1,166 @@
+/*
+ * TI TPS6586x GPIO driver
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ * Author: Laxman dewangan <ldewangan@nvidia.com>
+ *
+ * Based on tps6586x.c
+ * Copyright (c) 2010 CompuLab Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/tps6586x.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+/* GPIO control registers */
+#define TPS6586X_GPIOSET1 0x5d
+#define TPS6586X_GPIOSET2 0x5e
+
+struct tps6586x_gpio {
+ struct gpio_chip gpio_chip;
+ struct device *parent;
+};
+
+static inline struct tps6586x_gpio *to_tps6586x_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct tps6586x_gpio, gpio_chip);
+}
+
+static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
+ uint8_t val;
+ int ret;
+
+ ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
+ if (ret)
+ return ret;
+
+ return !!(val & (1 << offset));
+}
+
+static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
+
+ tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
+ value << offset, 1 << offset);
+}
+
+static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
+ uint8_t val, mask;
+
+ tps6586x_gpio_set(gc, offset, value);
+
+ val = 0x1 << (offset * 2);
+ mask = 0x3 << (offset * 2);
+
+ return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
+ val, mask);
+}
+
+static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps6586x_gpio *tps6586x_gpio = to_tps6586x_gpio(gc);
+
+ return tps6586x_irq_get_virq(tps6586x_gpio->parent,
+ TPS6586X_INT_PLDO_0 + offset);
+}
+
+static int tps6586x_gpio_probe(struct platform_device *pdev)
+{
+ struct tps6586x_platform_data *pdata;
+ struct tps6586x_gpio *tps6586x_gpio;
+ int ret;
+
+ pdata = dev_get_platdata(pdev->dev.parent);
+ tps6586x_gpio = devm_kzalloc(&pdev->dev,
+ sizeof(*tps6586x_gpio), GFP_KERNEL);
+ if (!tps6586x_gpio)
+ return -ENOMEM;
+
+ tps6586x_gpio->parent = pdev->dev.parent;
+
+ tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
+ tps6586x_gpio->gpio_chip.label = pdev->name;
+ tps6586x_gpio->gpio_chip.dev = &pdev->dev;
+ tps6586x_gpio->gpio_chip.ngpio = 4;
+ tps6586x_gpio->gpio_chip.can_sleep = true;
+
+ /* FIXME: add handling of GPIOs as dedicated inputs */
+ tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
+ tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
+ tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
+ tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
+
+#ifdef CONFIG_OF_GPIO
+ tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
+#endif
+ if (pdata && pdata->gpio_base)
+ tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ tps6586x_gpio->gpio_chip.base = -1;
+
+ ret = gpiochip_add(&tps6586x_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tps6586x_gpio);
+
+ return ret;
+}
+
+static int tps6586x_gpio_remove(struct platform_device *pdev)
+{
+ struct tps6586x_gpio *tps6586x_gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&tps6586x_gpio->gpio_chip);
+ return 0;
+}
+
+static struct platform_driver tps6586x_gpio_driver = {
+ .driver.name = "tps6586x-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = tps6586x_gpio_probe,
+ .remove = tps6586x_gpio_remove,
+};
+
+static int __init tps6586x_gpio_init(void)
+{
+ return platform_driver_register(&tps6586x_gpio_driver);
+}
+subsys_initcall(tps6586x_gpio_init);
+
+static void __exit tps6586x_gpio_exit(void)
+{
+ platform_driver_unregister(&tps6586x_gpio_driver);
+}
+module_exit(tps6586x_gpio_exit);
+
+MODULE_ALIAS("platform:tps6586x-gpio");
+MODULE_DESCRIPTION("GPIO interface for TPS6586X PMIC");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL");