Initial import

1 files changed, 133 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-twl6040.c b/drivers/gpio/gpio-twl6040.c
new file mode 100644
index 000000000..c946e7eef
--- /dev/null
+++ b/drivers/gpio/gpio-twl6040.c
@@ -0,0 +1,133 @@
+/*
+ * Access to GPOs on TWL6040 chip
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Authors:
+ *	Sergio Aguirre <saaguirre@ti.com>
+ *	Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kthread.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+
+#include <linux/mfd/twl6040.h>
+
+static struct gpio_chip twl6040gpo_chip;
+
+static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
+	int ret = 0;
+
+	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
+	if (ret < 0)
+		return ret;
+
+	return (ret >> offset) & 1;
+}
+
+static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
+				    int value)
+{
+	/* This only drives GPOs, and can't change direction */
+	return 0;
+}
+
+static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
+	int ret;
+	u8 gpoctl;
+
+	ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
+	if (ret < 0)
+		return;
+
+	if (value)
+		gpoctl = ret | (1 << offset);
+	else
+		gpoctl = ret & ~(1 << offset);
+
+	twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
+}
+
+static struct gpio_chip twl6040gpo_chip = {
+	.label			= "twl6040",
+	.owner			= THIS_MODULE,
+	.get			= twl6040gpo_get,
+	.direction_output	= twl6040gpo_direction_out,
+	.set			= twl6040gpo_set,
+	.can_sleep		= true,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int gpo_twl6040_probe(struct platform_device *pdev)
+{
+	struct device *twl6040_core_dev = pdev->dev.parent;
+	struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
+	int ret;
+
+	twl6040gpo_chip.base = -1;
+
+	if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
+		twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
+	else
+		twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
+
+	twl6040gpo_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+	twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
+#endif
+
+	ret = gpiochip_add(&twl6040gpo_chip);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
+		twl6040gpo_chip.ngpio = 0;
+	}
+
+	return ret;
+}
+
+static int gpo_twl6040_remove(struct platform_device *pdev)
+{
+	gpiochip_remove(&twl6040gpo_chip);
+	return 0;
+}
+
+/* Note:  this hardware lives inside an I2C-based multi-function device. */
+MODULE_ALIAS("platform:twl6040-gpo");
+
+static struct platform_driver gpo_twl6040_driver = {
+	.driver = {
+		.name	= "twl6040-gpo",
+	},
+	.probe		= gpo_twl6040_probe,
+	.remove		= gpo_twl6040_remove,
+};
+
+module_platform_driver(gpo_twl6040_driver);
+
+MODULE_AUTHOR("Texas Instruments, Inc.");
+MODULE_DESCRIPTION("GPO interface for TWL6040");
+MODULE_LICENSE("GPL");