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Commit 2961cb22 authored by Jean Delvare's avatar Jean Delvare Committed by Mark M. Hoffman
Browse files

hwmon: (w83781d) Fix I/O resource conflict with PNP 

Only request I/O ports 0x295-0x296 instead of the full I/O address
range. This solves a conflict with PNP resources on a few motherboards.

Also request the I/O ports in two parts (4 low ports, 4 high ports)
during device detection, otherwise the PNP resource makes the request
(and thus the detection) fail.

This fixes lm-sensors ticket #2306:
http://www.lm-sensors.org/ticket/2306



Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarMark M. Hoffman <mhoffman@lightlink.com>
parent 05dda977

drivers/hwmon/w83781d.c

+16 −5
Original line number Diff line number Diff line
@@ -1367,7 +1367,8 @@ w83781d_isa_probe(struct platform_device *pdev) 


	/* Reserve the ISA region */

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);

	if (!request_region(res->start, W83781D_EXTENT, "w83781d")) {

	if (!request_region(res->start + W83781D_ADDR_REG_OFFSET, 2,

			    "w83781d")) {

		err = -EBUSY;

		goto exit;

	}
@@ -1415,7 +1416,7 @@ w83781d_isa_probe(struct platform_device *pdev) 
	device_remove_file(&pdev->dev, &dev_attr_name);

	kfree(data);

 exit_release_region:

	release_region(res->start, W83781D_EXTENT);

	release_region(res->start + W83781D_ADDR_REG_OFFSET, 2);

 exit:

	return err;

}
@@ -1429,7 +1430,7 @@ w83781d_isa_remove(struct platform_device *pdev) 
	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group);

	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group_opt);

	device_remove_file(&pdev->dev, &dev_attr_name);

	release_region(data->client.addr, W83781D_EXTENT);

	release_region(data->client.addr + W83781D_ADDR_REG_OFFSET, 2);

	kfree(data);



	return 0;
@@ -1797,8 +1798,17 @@ w83781d_isa_found(unsigned short address) 
{

	int val, save, found = 0;



	if (!request_region(address, W83781D_EXTENT, "w83781d"))

	/* We have to request the region in two parts because some

	   boards declare base+4 to base+7 as a PNP device */

	if (!request_region(address, 4, "w83781d")) {

		pr_debug("w83781d: Failed to request low part of region\n");

		return 0;

	}

	if (!request_region(address + 4, 4, "w83781d")) {

		pr_debug("w83781d: Failed to request high part of region\n");

		release_region(address, 4);

		return 0;

	}



#define REALLY_SLOW_IO

	/* We need the timeouts for at least some W83781D-like
@@ -1871,7 +1881,8 @@ w83781d_isa_found(unsigned short address) 
			val == 0x30 ? "W83782D" : "W83781D", (int)address);



 release:

	release_region(address, W83781D_EXTENT);

	release_region(address + 4, 4);

	release_region(address, 4);

	return found;

}