sdio: add /proc interface to sdio_uart driver

This mimics what the serial_core does.  Useful for diagnostics.

Signed-off-by: Nicolas Pitre <npitre@mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index e4d9e85ff584..190120d1449a 100644
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -913,6 +913,67 @@ static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
         return result;
 }
 
+static int sdio_uart_read_proc(char *page, char **start, off_t off,
+                               int count, int *eof, void *data)
+{
+        int i, len = 0;
+        off_t begin = 0;
+
+        len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
+                       "", "", "");
+        for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
+                struct sdio_uart_port *port = sdio_uart_port_get(i);
+                if (port) {
+                        len += sprintf(page+len, "%d: uart:SDIO", i);
+                        if(capable(CAP_SYS_ADMIN)) {
+                                len += sprintf(page + len, " tx:%d rx:%d",
+                                               port->icount.tx, port->icount.rx);
+                                if (port->icount.frame)
+                                        len += sprintf(page + len, " fe:%d",
+                                                       port->icount.frame);
+                                if (port->icount.parity)
+                                        len += sprintf(page + len, " pe:%d",
+                                                       port->icount.parity);
+                                if (port->icount.brk)
+                                        len += sprintf(page + len, " brk:%d",
+                                                       port->icount.brk);
+                                if (port->icount.overrun)
+                                        len += sprintf(page + len, " oe:%d",
+                                                       port->icount.overrun);
+                                if (port->icount.cts)
+                                        len += sprintf(page + len, " cts:%d",
+                                                       port->icount.cts);
+                                if (port->icount.dsr)
+                                        len += sprintf(page + len, " dsr:%d",
+                                                       port->icount.dsr);
+                                if (port->icount.rng)
+                                        len += sprintf(page + len, " rng:%d",
+                                                       port->icount.rng);
+                                if (port->icount.dcd)
+                                        len += sprintf(page + len, " dcd:%d",
+                                                       port->icount.dcd);
+                        }
+                        strcat(page, "\n");
+                        len++;
+                        sdio_uart_port_put(port);
+                }
+
+                if (len + begin > off + count)
+                        goto done;
+                if (len + begin < off) {
+                        begin += len;
+                        len = 0;
+                }
+        }
+        *eof = 1;
+
+done:
+        if (off >= len + begin)
+                return 0;
+        *start = page + (off - begin);
+        return (count < begin + len - off) ? count : (begin + len - off);
+}
+
 static const struct tty_operations sdio_uart_ops = {
         .open                   = sdio_uart_open,
         .close                  = sdio_uart_close,
@@ -926,6 +987,7 @@ static const struct tty_operations sdio_uart_ops = {
         .break_ctl              = sdio_uart_break_ctl,
         .tiocmget               = sdio_uart_tiocmget,
         .tiocmset               = sdio_uart_tiocmset,
+        .read_proc              = sdio_uart_read_proc,
 };
 
 static struct tty_driver *sdio_uart_tty_driver;