goku_udc: Don't use create_proc_read_entry()

Don't use create_proc_read_entry() as that is deprecated, but rather use
proc_create_data() and seq_file instead.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Felipe Balbi <balbi@ti.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: linux-usb@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 85742d4c67dfa2708a763bd607d580936c38cd88..57a547049df57a828f838892a003bf36577ceb4c 100644 (file)
--- 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>
@@ -1008,7 +1009,7 @@ 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)";
@@ -1025,13 +1026,10 @@ 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" : "",
@@ -1058,33 +1056,23 @@ 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"
@@ -1096,7 +1084,7 @@ 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;
@@ -1108,27 +1096,24 @@ 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+" : "",
@@ -1143,9 +1128,8 @@ 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++) {
@@ -1156,7 +1140,7 @@ 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,
@@ -1189,18 +1173,12 @@ 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) {
@@ -1214,23 +1192,34 @@ 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 */
 
 /*-------------------------------------------------------------------------*/
@@ -1807,7 +1796,7 @@ 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 = device_register(&dev->gadget.dev);