proc tty: switch sdio_uart to ->proc_fops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 30 insertions, 32 deletions

diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c
index 78ad48718ab0..36a8d53ad2a2 100644
--- a/drivers/mmc/card/sdio_uart.c
+++ b/drivers/mmc/card/sdio_uart.c
@@ -30,6 +30,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
+#include <linux/seq_file.h>
 #include <linux/serial_reg.h>
 #include <linux/circ_buf.h>
 #include <linux/gfp.h>
@@ -933,67 +934,64 @@ 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)
+static int sdio_uart_proc_show(struct seq_file *m, void *v)
 {
-        int i, len = 0;
-        off_t begin = 0;
+        int i;
 
-        len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
+        seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
                        "", "", "");
-        for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
+        for (i = 0; i < UART_NR; i++) {
                 struct sdio_uart_port *port = sdio_uart_port_get(i);
                 if (port) {
-                        len += sprintf(page+len, "%d: uart:SDIO", i);
+                        seq_printf(m, "%d: uart:SDIO", i);
                         if(capable(CAP_SYS_ADMIN)) {
-                                len += sprintf(page + len, " tx:%d rx:%d",
+                                seq_printf(m, " tx:%d rx:%d",
                                                port->icount.tx, port->icount.rx);
                                 if (port->icount.frame)
-                                        len += sprintf(page + len, " fe:%d",
+                                        seq_printf(m, " fe:%d",
                                                        port->icount.frame);
                                 if (port->icount.parity)
-                                        len += sprintf(page + len, " pe:%d",
+                                        seq_printf(m, " pe:%d",
                                                        port->icount.parity);
                                 if (port->icount.brk)
-                                        len += sprintf(page + len, " brk:%d",
+                                        seq_printf(m, " brk:%d",
                                                        port->icount.brk);
                                 if (port->icount.overrun)
-                                        len += sprintf(page + len, " oe:%d",
+                                        seq_printf(m, " oe:%d",
                                                        port->icount.overrun);
                                 if (port->icount.cts)
-                                        len += sprintf(page + len, " cts:%d",
+                                        seq_printf(m, " cts:%d",
                                                        port->icount.cts);
                                 if (port->icount.dsr)
-                                        len += sprintf(page + len, " dsr:%d",
+                                        seq_printf(m, " dsr:%d",
                                                        port->icount.dsr);
                                 if (port->icount.rng)
-                                        len += sprintf(page + len, " rng:%d",
+                                        seq_printf(m, " rng:%d",
                                                        port->icount.rng);
                                 if (port->icount.dcd)
-                                        len += sprintf(page + len, " dcd:%d",
+                                        seq_printf(m, " 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;
+                        seq_putc(m, '\n');
                 }
         }
-        *eof = 1;
+        return 0;
+}
 
-done:
-        if (off >= len + begin)
-                return 0;
-        *start = page + (off - begin);
-        return (count < begin + len - off) ? count : (begin + len - off);
+static int sdio_uart_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, sdio_uart_proc_show, NULL);
 }
 
+static const struct file_operations sdio_uart_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = sdio_uart_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static const struct tty_operations sdio_uart_ops = {
         .open                   = sdio_uart_open,
         .close                  = sdio_uart_close,
@@ -1007,7 +1005,7 @@ 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,
+        .proc_fops              = &sdio_uart_proc_fops,
 };
 
 static struct tty_driver *sdio_uart_tty_driver;