How about this one?
>From d5636730ab4fa52d64c7e530518bf25c68a590de Mon Sep 17 00:00:00 2001 From: Phillip Susi <psusi@faldara.(none)> Date: Sat, 13 Nov 2010 00:20:53 -0500 Subject: [PATCH] [PATCH] Export ahci eSATA attribute The AHCI standard defines a port bit that indicates that port is an eSATA external port. Detect and export this bit as a sysfs attribute named ahci_port_external. It is intended that this information be used by udisks to auto mount external eSATA drives when they are hot plugged. --- drivers/ata/ahci.h | 1 + drivers/ata/libahci.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+), 0 deletions(-) diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h index 329cbbb..421c523 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -172,6 +172,7 @@ enum { PORT_CMD_ALPE = (1 << 26), /* Aggressive Link PM enable */ PORT_CMD_ATAPI = (1 << 24), /* Device is ATAPI */ PORT_CMD_FBSCP = (1 << 22), /* FBS Capable Port */ + PORT_CMD_ESP = (1 << 21), /* eSATA Port */ PORT_CMD_PMP = (1 << 17), /* PMP attached */ PORT_CMD_LIST_ON = (1 << 15), /* cmd list DMA engine running */ PORT_CMD_FIS_ON = (1 << 14), /* FIS DMA engine running */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index ebc08d6..c5b71ad 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -43,6 +43,7 @@ #include <linux/device.h> #include <scsi/scsi_host.h> #include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> #include <linux/libata.h> #include "ahci.h" @@ -107,6 +108,8 @@ static ssize_t ahci_show_host_version(struct device *dev, struct device_attribute *attr, char *buf); static ssize_t ahci_show_port_cmd(struct device *dev, struct device_attribute *attr, char *buf); +static ssize_t ahci_show_port_external(struct device *dev, + struct device_attribute *attr, char *buf); static ssize_t ahci_read_em_buffer(struct device *dev, struct device_attribute *attr, char *buf); static ssize_t ahci_store_em_buffer(struct device *dev, @@ -117,6 +120,7 @@ static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL); static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL); static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL); static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL); +static DEVICE_ATTR(ahci_port_external, S_IRUGO, ahci_show_port_external, NULL); static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO, ahci_read_em_buffer, ahci_store_em_buffer); @@ -136,6 +140,7 @@ EXPORT_SYMBOL_GPL(ahci_shost_attrs); struct device_attribute *ahci_sdev_attrs[] = { &dev_attr_sw_activity, &dev_attr_unload_heads, + &dev_attr_ahci_port_external, NULL }; EXPORT_SYMBOL_GPL(ahci_sdev_attrs); @@ -250,6 +255,16 @@ static ssize_t ahci_show_port_cmd(struct device *dev, return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD)); } +static ssize_t ahci_show_port_external(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + struct ata_port *ap = ata_shost_to_port(sdev->host); + void __iomem *port_mmio = ahci_port_base(ap); + + return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD) & PORT_CMD_ESP ? 1 : 0); +} + static ssize_t ahci_read_em_buffer(struct device *dev, struct device_attribute *attr, char *buf) { -- 1.7.1