linux-kernel - [PATCH V3 1/5] i2c: Add irq_gpio field to struct i2c_client, i2c_board

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Date:	Thu,  1 Sep 2011 16:04:27 -0600
From:	Stephen Warren <swarren@...dia.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jean Delvare <khali@...ux-fr.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Jonathan Cameron <jic23@....ac.uk>,
	Grant Likely <grant.likely@...retlab.ca>,
	Arnd Bergmann <arnd@...db.de>
Cc:	Russell King <linux@....linux.org.uk>,
	Jonathan Cameron <jic23@....ac.uk>,
	Andrew Chew <achew@...dia.com>, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net,
	Stephen Warren <swarren@...dia.com>
Subject: [PATCH V3 1/5] i2c: Add irq_gpio field to struct i2c_client, i2c_board_info.

Some devices use a single pin as both an IRQ and a GPIO. In that case,
irq_gpio is the GPIO ID for that pin. Not all drivers use this feature.
Where they do, and the use of this feature is optional, and the system
wishes to disable this feature, this field must be explicitly set to a
defined invalid GPIO ID, such as -1.

Signed-off-by: Stephen Warren <swarren@...dia.com>
---
v3: Also add the field to i2c_board_info, and copy the field from
    i2c_board_info to i2c_client upon instantiation

 drivers/i2c/i2c-core.c |    1 +
 include/linux/i2c.h    |    9 +++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 131079a..da12540 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -518,6 +518,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
 	client->flags = info->flags;
 	client->addr = info->addr;
 	client->irq = info->irq;
+	client->irq_gpio = info->irq_gpio;
 
 	strlcpy(client->name, info->type, sizeof(client->name));
 
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 3fad485..49e2e36 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -192,6 +192,12 @@ struct i2c_driver {
  * @driver: device's driver, hence pointer to access routines
  * @dev: Driver model device node for the slave.
  * @irq: indicates the IRQ generated by this device (if any)
+ * @irq_gpio: some devices use a single pin as both an IRQ and a GPIO. In
+ *	that case, irq_gpio is the GPIO ID for that pin. Not all drivers
+ *	use this feature. Where they do, and the use of this feature is
+ *	optional, and the system wishes to disable this feature, this
+ *	field must be explicitly set to a defined invalid GPIO ID, such
+ *	as -1.
  * @detected: member of an i2c_driver.clients list or i2c-core's
  *	userspace_devices list
  *
@@ -209,6 +215,7 @@ struct i2c_client {
 	struct i2c_driver *driver;	/* and our access routines	*/
 	struct device dev;		/* the device structure		*/
 	int irq;			/* irq issued by device		*/
+	int irq_gpio;			/* gpio corresponding to irq	*/
 	struct list_head detected;
 };
 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
@@ -240,6 +247,7 @@ static inline void i2c_set_clientdata(struct i2c_client *dev, void *data)
  * @archdata: copied into i2c_client.dev.archdata
  * @of_node: pointer to OpenFirmware device node
  * @irq: stored in i2c_client.irq
+ * @irq_gpio: stored in i2c_client.irq_gpio
  *
  * I2C doesn't actually support hardware probing, although controllers and
  * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
@@ -260,6 +268,7 @@ struct i2c_board_info {
 	struct dev_archdata	*archdata;
 	struct device_node *of_node;
 	int		irq;
+	int		irq_gpio;
 };
 
 /**
-- 
1.7.0.4

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