Commit f04ddfcd authored by Denis Turischev's avatar Denis Turischev Committed by Samuel Ortiz
Browse files

gpio: Add Tunnel Creek support to sch_gpio 



Almost the same driver for both Poulsbo and Tunnel Creek.
The difference is in quantity of GPIOs powered by the core power
rail and by suspend power supply, default values for some GPIOs, etc.
Detect actual hardware by platform device ID assigned in lpc_sch
and set configuration accordingly.

Signed-off-by: default avatarDenis Turischev <denis@compulab.co.il>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent e967f77d

drivers/gpio/Kconfig

+5 −2
Original line number Diff line number Diff line
@@ -100,18 +100,21 @@ config GPIO_VR41XX 
	  Say yes here to support the NEC VR4100 series General-purpose I/O Uint



config GPIO_SCH

	tristate "Intel SCH GPIO"

	tristate "Intel SCH/TunnelCreek GPIO"

	depends on GPIOLIB && PCI && X86

	select MFD_CORE

	select LPC_SCH

	help

	  Say yes here to support GPIO interface on Intel Poulsbo SCH.

	  Say yes here to support GPIO interface on Intel Poulsbo SCH

	  or Intel Tunnel Creek processor.

	  The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are

	  powered by the core power rail and are turned off during sleep

	  modes (S3 and higher). The remaining four GPIOs are powered by

	  the Intel SCH suspend power supply. These GPIOs remain

	  active during S3. The suspend powered GPIOs can be used to wake the

	  system from the Suspend-to-RAM state.

	  The Intel Tunnel Creek processor has 5 GPIOs powered by the

	  core power rail and 9 from suspend power supply.



	  This driver can also be built as a module. If so, the module

	  will be called sch-gpio.

drivers/gpio/sch_gpio.c

+39 −18
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/errno.h>

#include <linux/acpi.h>

#include <linux/platform_device.h>

#include <linux/pci_ids.h>



#include <linux/gpio.h>
@@ -187,7 +188,11 @@ static struct gpio_chip sch_gpio_resume = { 
static int __devinit sch_gpio_probe(struct platform_device *pdev)

{

	struct resource *res;

	int err;

	int err, id;



	id = pdev->id;

	if (!id)

		return -ENODEV;



	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

	if (!res)
@@ -198,21 +203,13 @@ static int __devinit sch_gpio_probe(struct platform_device *pdev) 


	gpio_ba = res->start;



	switch (id) {

		case PCI_DEVICE_ID_INTEL_SCH_LPC:

			sch_gpio_core.base = 0;

			sch_gpio_core.ngpio = 10;

	sch_gpio_core.dev = &pdev->dev;



			sch_gpio_resume.base = 10;

			sch_gpio_resume.ngpio = 4;

	sch_gpio_resume.dev = &pdev->dev;



	err = gpiochip_add(&sch_gpio_core);

	if (err < 0)

		goto err_sch_gpio_core;



	err = gpiochip_add(&sch_gpio_resume);

	if (err < 0)

		goto err_sch_gpio_resume;



			/*

			 * GPIO[6:0] enabled by default
@@ -225,6 +222,30 @@ static int __devinit sch_gpio_probe(struct platform_device *pdev) 
			 * Enable SUS_GPIO3 resume powered gpio explicitly

			 */

			outb(0x8, gpio_ba + RGEN);

			break;



		case PCI_DEVICE_ID_INTEL_ITC_LPC:

			sch_gpio_core.base = 0;

			sch_gpio_core.ngpio = 5;



			sch_gpio_resume.base = 5;

			sch_gpio_resume.ngpio = 9;

			break;



		default:

			return -ENODEV;

	}



	sch_gpio_core.dev = &pdev->dev;

	sch_gpio_resume.dev = &pdev->dev;



	err = gpiochip_add(&sch_gpio_core);

	if (err < 0)

		goto err_sch_gpio_core;



	err = gpiochip_add(&sch_gpio_resume);

	if (err < 0)

		goto err_sch_gpio_resume;



	return 0;

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