[PATCH 3/3] gpio: Add basic support for TWL6040 GPOs

From: Peter Ujfalusi
Date: Wed Jul 18 2012 - 05:20:31 EST


TWL6040 provides GPO lines to be used for controlling external devices.The number
of lines different between versions: twl6040 have 3 GPO while TWL6041 have 1.

Signed-off-by: Sergio Aguirre <saaguirre@xxxxxx>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-twl6040.c | 137 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 145 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/gpio-twl6040.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 542f0c0..4ea54a2 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -396,6 +396,13 @@ config GPIO_TWL4030
Say yes here to access the GPIO signals of various multi-function
power management chips from Texas Instruments.

+config GPIO_TWL6040
+ tristate "TWL6040 GPO"
+ depends on TWL6040_CORE
+ help
+ Say yes here to access the GPO signals of twl6040
+ audio chip from Texas Instruments.
+
config GPIO_WM831X
tristate "WM831x GPIOs"
depends on MFD_WM831X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 0f55662..d20f903 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += gpio-tnetv107x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o
+obj-$(CONFIG_GPIO_TWL6040) += gpio-twl6040.o
obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
obj-$(CONFIG_GPIO_VX855) += gpio-vx855.o
diff --git a/drivers/gpio/gpio-twl6040.c b/drivers/gpio/gpio-twl6040.c
new file mode 100644
index 0000000..f0b2703
--- /dev/null
+++ b/drivers/gpio/gpio-twl6040.c
@@ -0,0 +1,137 @@
+/*
+ * Access to GPOs on TWL6040 chip
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Authors:
+ * Sergio Aguirre <saaguirre@xxxxxx>
+ * Peter Ujfalusi <peter.ujfalusi@xxxxxx>
+ *
+ * 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 = 1,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int __devinit gpo_twl6040_probe(struct platform_device *pdev)
+{
+ struct twl6040_gpo_data *pdata = pdev->dev.platform_data;
+ struct device *twl6040_core_dev = pdev->dev.parent;
+ struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
+ int ret;
+
+ if (pdata)
+ twl6040gpo_chip.base = pdata->gpio_base;
+ else
+ 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 3 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 __devexit gpo_twl6040_remove(struct platform_device *pdev)
+{
+ return gpiochip_remove(&twl6040gpo_chip);
+}
+
+/* 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",
+ .owner = THIS_MODULE,
+ },
+ .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");
--
1.7.8.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/