pcmcia: add socket register data to sysfs for yenta devices

It's simple, and it's a good debugging aid.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 41 insertions, 1 deletions

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index db9f952f9e3c..ec6ab65f0872 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -151,6 +151,40 @@ static void exca_writew(struct yenta_socket *socket, unsigned reg, u16 val)
         readb(socket->base + 0x800 + reg + 1);
 }
 
+static ssize_t show_yenta_registers(struct device *yentadev, struct device_attribute *attr, char *buf)
+{
+        struct pci_dev *dev = to_pci_dev(yentadev);
+        struct yenta_socket *socket = pci_get_drvdata(dev);
+        int offset = 0, i;
+
+        offset = snprintf(buf, PAGE_SIZE, "CB registers:");
+        for (i = 0; i < 0x24; i += 4) {
+                unsigned val;
+                if (!(i & 15))
+                        offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i);
+                val = cb_readl(socket, i);
+                offset += snprintf(buf + offset, PAGE_SIZE - offset, " %08x", val);
+        }
+
+        offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n\nExCA registers:");
+        for (i = 0; i < 0x45; i++) {
+                unsigned char val;
+                if (!(i & 7)) {
+                        if (i & 8) {
+                                memcpy(buf + offset, " -", 2);
+                                offset += 2;
+                        } else
+                                offset += snprintf(buf + offset, PAGE_SIZE - offset, "\n%02x:", i);
+                }
+                val = exca_readb(socket, i);
+                offset += snprintf(buf + offset, PAGE_SIZE - offset, " %02x", val);
+        }
+        buf[offset++] = '\n';
+        return offset;
+}
+
+static DEVICE_ATTR(yenta_registers, S_IRUSR, show_yenta_registers, NULL);
+
 /*
  * Ugh, mixed-mode cardbus and 16-bit pccard state: things depend
  * on what kind of card is inserted..
@@ -765,6 +799,9 @@ static void yenta_close(struct pci_dev *dev)
 {
         struct yenta_socket *sock = pci_get_drvdata(dev);
 
+        /* Remove the register attributes */
+        device_remove_file(&dev->dev, &dev_attr_yenta_registers);
+
         /* we don't want a dying socket registered */
         pcmcia_unregister_socket(&sock->socket);
         
@@ -1138,8 +1175,11 @@ static int __devinit yenta_probe (struct pci_dev *dev, const struct pci_device_i
 
         /* Register it with the pcmcia layer.. */
         ret = pcmcia_register_socket(&socket->socket);
-        if (ret == 0)
+        if (ret == 0) {
+                /* Add the yenta register attributes */
+                device_create_file(&dev->dev, &dev_attr_yenta_registers);
                 goto out;
+        }
 
  unmap:
         iounmap(socket->base);