1 files changed, 39 insertions, 50 deletions

diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 991aba390d9d..480eeb7cfd92 100644
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -35,6 +35,7 @@
 #include <linux/list.h>
 #include <linux/interrupt.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/device.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
@@ -1005,7 +1006,7 @@ static const struct usb_gadget_ops goku_ops = {
 
 /*-------------------------------------------------------------------------*/
 
-static inline char *dmastr(void)
+static inline const char *dmastr(void)
 {
         if (use_dma == 0)
                 return "(dma disabled)";
@@ -1022,13 +1023,10 @@ static const char proc_node_name [] = "driver/udc";
 #define FOURBITS "%s%s%s%s"
 #define EIGHTBITS FOURBITS FOURBITS
 
-static void
-dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
+static void dump_intmask(struct seq_file *m, const char *label, u32 mask)
 {
-        int t;
-
         /* int_status is the same format ... */
-        t = scnprintf(*next, *size,
+        seq_printf(m,
                 "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n",
                 label, mask,
                 (mask & INT_PWRDETECT) ? " power" : "",
@@ -1055,33 +1053,23 @@ dump_intmask(const char *label, u32 mask, char **next, unsigned *size)
                 (mask & INT_ENDPOINT0) ? " ep0" : "",
                 (mask & INT_USBRESET) ? " reset" : "",
                 (mask & INT_SUSPEND) ? " suspend" : "");
-        *size -= t;
-        *next += t;
 }
 
 
-static int
-udc_proc_read(char *buffer, char **start, off_t off, int count,
-                int *eof, void *_dev)
+static int udc_proc_read(struct seq_file *m, void *v)
 {
-        char                            *buf = buffer;
-        struct goku_udc                 *dev = _dev;
+        struct goku_udc                 *dev = m->private;
         struct goku_udc_regs __iomem    *regs = dev->regs;
-        char                            *next = buf;
-        unsigned                        size = count;
         unsigned long                   flags;
-        int                             i, t, is_usb_connected;
+        int                             i, is_usb_connected;
         u32                             tmp;
 
-        if (off != 0)
-                return 0;
-
         local_irq_save(flags);
 
         /* basic device status */
         tmp = readl(&regs->power_detect);
         is_usb_connected = tmp & PW_DETECT;
-        t = scnprintf(next, size,
+        seq_printf(m,
                 "%s - %s\n"
                 "%s version: %s %s\n"
                 "Gadget driver: %s\n"
@@ -1093,7 +1081,7 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                 is_usb_connected
                         ? ((tmp & PW_PULLUP) ? "full speed" : "powered")
                         : "disconnected",
-                ({char *state;
+                ({const char *state;
                 switch(dev->ep0state){
                 case EP0_DISCONNECT:    state = "ep0_disconnect"; break;
                 case EP0_IDLE:          state = "ep0_idle"; break;
@@ -1105,27 +1093,24 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                 default:                state = "ep0_?"; break;
                 } state; })
                 );
-        size -= t;
-        next += t;
 
-        dump_intmask("int_status", readl(&regs->int_status), &next, &size);
-        dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
+        dump_intmask(m, "int_status", readl(&regs->int_status));
+        dump_intmask(m, "int_enable", readl(&regs->int_enable));
 
         if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
                 goto done;
 
         /* registers for (active) device and ep0 */
-        t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
+        if (seq_printf(m, "\nirqs %lu\ndataset %02x "
                         "single.bcs %02x.%02x state %x addr %u\n",
                         dev->irqs, readl(&regs->DataSet),
                         readl(&regs->EPxSingle), readl(&regs->EPxBCS),
                         readl(&regs->UsbState),
-                        readl(&regs->address));
-        size -= t;
-        next += t;
+                        readl(&regs->address)) < 0)
+                goto done;
 
         tmp = readl(&regs->dma_master);
-        t = scnprintf(next, size,
+        if (seq_printf(m,
                 "dma %03X =" EIGHTBITS "%s %s\n", tmp,
                 (tmp & MST_EOPB_DIS) ? " eopb-" : "",
                 (tmp & MST_EOPB_ENA) ? " eopb+" : "",
@@ -1140,9 +1125,8 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                 (tmp & MST_WR_ENA) ? " OUT" : "",
                 (tmp & MST_CONNECTION)
                         ? "ep1in/ep2out"
-                        : "ep1out/ep2in");
-        size -= t;
-        next += t;
+                        : "ep1out/ep2in") < 0)
+                goto done;
 
         /* dump endpoint queues */
         for (i = 0; i < 4; i++) {
@@ -1153,7 +1137,7 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                         continue;
 
                 tmp = readl(ep->reg_status);
-                t = scnprintf(next, size,
+                if (seq_printf(m,
                         "%s %s max %u %s, irqs %lu, "
                         "status %02x (%s) " FOURBITS "\n",
                         ep->ep.name,
@@ -1186,18 +1170,12 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                         (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
                         (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
                         (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
-                        );
-                if (t <= 0 || t > size)
+                        ) < 0)
                         goto done;
-                size -= t;
-                next += t;
 
                 if (list_empty(&ep->queue)) {
-                        t = scnprintf(next, size, "\t(nothing queued)\n");
-                        if (t <= 0 || t > size)
+                        if (seq_puts(m, "\t(nothing queued)\n") < 0)
                                 goto done;
-                        size -= t;
-                        next += t;
                         continue;
                 }
                 list_for_each_entry(req, &ep->queue, queue) {
@@ -1211,23 +1189,34 @@ udc_proc_read(char *buffer, char **start, off_t off, int count,
                         } else
                                 tmp = req->req.actual;
 
-                        t = scnprintf(next, size,
+                        if (seq_printf(m,
                                 "\treq %p len %u/%u buf %p\n",
                                 &req->req, tmp, req->req.length,
-                                req->req.buf);
-                        if (t <= 0 || t > size)
+                                req->req.buf) < 0)
                                 goto done;
-                        size -= t;
-                        next += t;
                 }
         }
 
 done:
         local_irq_restore(flags);
-        *eof = 1;
-        return count - size;
+        return 0;
+}
+
+/*
+ * seq_file wrappers for procfile show routines.
+ */
+static int udc_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, udc_proc_read, PDE_DATA(file_inode(file)));
 }
 
+static const struct file_operations udc_proc_fops = {
+        .open           = udc_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
 
 /*-------------------------------------------------------------------------*/
@@ -1796,7 +1785,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 
 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
-        create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
+        proc_create_data(proc_node_name, 0, NULL, &udc_proc_fops, dev);
 #endif
 
         retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,