i2c-piix4: Better bus names

The I2C bus names are supposed to be stable as they can be used by
userspace to uniquely identify a specific I2C bus. So restore the
original names for all legacy (pre-SB800) devices.

For SB800 devices and later, improve the names. "SDA" refers to the
serial data pin of each SMBus port, it's an implementation detail the
user doesn't need to know. Use "port" instead, which is easier to
understand.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Christian Fetzer <fetzer.ch@gmail.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
---
 drivers/i2c/busses/i2c-piix4.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

On Wed, Jan 27, 2016 at 02:40:33PM +0100, Jean Delvare wrote:
> The I2C bus names are supposed to be stable as they can be used by
> userspace to uniquely identify a specific I2C bus. So restore the
> original names for all legacy (pre-SB800) devices.

Good point. I missed the fact that these get exposed to userspace.

> 
> For SB800 devices and later, improve the names. "SDA" refers to the
> serial data pin of each SMBus port, it's an implementation detail the
> user doesn't need to know. Use "port" instead, which is easier to
> understand.
> 
> Signed-off-by: Jean Delvare <jdelvare@suse.de>
> Cc: Christian Fetzer <fetzer.ch@gmail.com>
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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> Am 27.01.2016 um 14:40 schrieb Jean Delvare <jdelvare@suse.de>:
> 
> The I2C bus names are supposed to be stable as they can be used by
> userspace to uniquely identify a specific I2C bus. So restore the
> original names for all legacy (pre-SB800) devices.
> 
> For SB800 devices and later, improve the names. "SDA" refers to the
> serial data pin of each SMBus port, it's an implementation detail the
> user doesn't need to know. Use "port" instead, which is easier to
> understand.

That’s indeed more readable now. Works on my N54L,
I don’t have non-SB800 hardware to verify that part of the patch though.

Tested-by: Christian Fetzer <fetzer.ch@gmail.com>

> 
> Signed-off-by: Jean Delvare <jdelvare@suse.de>
> Cc: Christian Fetzer <fetzer.ch@gmail.com>
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Wolfram Sang <wsa@the-dreams.de>
> ---
> drivers/i2c/busses/i2c-piix4.c |   13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
> 
> --- linux-4.5-rc0.orig/drivers/i2c/busses/i2c-piix4.c	2016-01-26 18:18:45.324952783 +0100
> +++ linux-4.5-rc0/drivers/i2c/busses/i2c-piix4.c	2016-01-26 18:25:38.487310421 +0100
> @@ -139,9 +139,9 @@ static const struct dmi_system_id piix4_
> /* SB800 globals */
> static DEFINE_MUTEX(piix4_mutex_sb800);
> static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
> -	"SDA0", "SDA2", "SDA3", "SDA4"
> +	" port 0", " port 2", " port 3", " port 4"
> };
> -static const char *piix4_aux_port_name_sb800 = "SDA1";
> +static const char *piix4_aux_port_name_sb800 = " port 1";
> 
> struct i2c_piix4_adapdata {
> 	unsigned short smba;
> @@ -660,7 +660,7 @@ static int piix4_add_adapter(struct pci_
> 	adap->dev.parent = &dev->dev;
> 
> 	snprintf(adap->name, sizeof(adap->name),
> -		"SMBus PIIX4 adapter %s at %04x", name, smba);
> +		"SMBus PIIX4 adapter%s at %04x", name, smba);
> 
> 	i2c_set_adapdata(adap, adapdata);
> 
> @@ -712,11 +712,14 @@ error:
> static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
> {
> 	int retval;
> +	bool is_sb800 = false;
> 
> 	if ((dev->vendor == PCI_VENDOR_ID_ATI &&
> 	     dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
> 	     dev->revision >= 0x40) ||
> 	    dev->vendor == PCI_VENDOR_ID_AMD) {
> +		is_sb800 = true;
> +
> 		if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
> 			dev_err(&dev->dev,
> 			"SMBus base address index region 0x%x already in use!\n",
> @@ -746,7 +749,7 @@ static int piix4_probe(struct pci_dev *d
> 			return retval;
> 
> 		/* Try to register main SMBus adapter, give up if we can't */
> -		retval = piix4_add_adapter(dev, retval, false, 0, "main",
> +		retval = piix4_add_adapter(dev, retval, false, 0, "",
> 					   &piix4_main_adapters[0]);
> 		if (retval < 0)
> 			return retval;
> @@ -774,7 +777,7 @@ static int piix4_probe(struct pci_dev *d
> 		/* Try to add the aux adapter if it exists,
> 		 * piix4_add_adapter will clean up if this fails */
> 		piix4_add_adapter(dev, retval, false, 0,
> -				  piix4_aux_port_name_sb800,
> +				  is_sb800 ? piix4_aux_port_name_sb800 : "",
> 				  &piix4_aux_adapter);
> 	}
> 
> 
> 
> -- 
> Jean Delvare
> SUSE L3 Support

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On Wed, Jan 27, 2016 at 02:40:33PM +0100, Jean Delvare wrote:
> The I2C bus names are supposed to be stable as they can be used by
> userspace to uniquely identify a specific I2C bus. So restore the
> original names for all legacy (pre-SB800) devices.
> 
> For SB800 devices and later, improve the names. "SDA" refers to the
> serial data pin of each SMBus port, it's an implementation detail the
> user doesn't need to know. Use "port" instead, which is easier to
> understand.
> 
> Signed-off-by: Jean Delvare <jdelvare@suse.de>
> Cc: Christian Fetzer <fetzer.ch@gmail.com>
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Wolfram Sang <wsa@the-dreams.de>

Changed the subject to "don't regress on bus names" and applied to
for-current, thanks!

Jean, could you use the "i2c: <driver>: <subject>" (check git log for
examples) pattern for your future patches? Thanks!

On Fri, 29 Jan 2016 11:17:49 +0100, Wolfram Sang wrote:
> On Wed, Jan 27, 2016 at 02:40:33PM +0100, Jean Delvare wrote:
> > The I2C bus names are supposed to be stable as they can be used by
> > userspace to uniquely identify a specific I2C bus. So restore the
> > original names for all legacy (pre-SB800) devices.
> > 
> > For SB800 devices and later, improve the names. "SDA" refers to the
> > serial data pin of each SMBus port, it's an implementation detail the
> > user doesn't need to know. Use "port" instead, which is easier to
> > understand.
> > 
> > Signed-off-by: Jean Delvare <jdelvare@suse.de>
> > Cc: Christian Fetzer <fetzer.ch@gmail.com>
> > Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
> > Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > Cc: Wolfram Sang <wsa@the-dreams.de>
> 
> Changed the subject to "don't regress on bus names" and applied to
> for-current, thanks!

Thanks.

> Jean, could you use the "i2c: <driver>: <subject>" (check git log for
> examples) pattern for your future patches? Thanks!

OK, I will do that.