USB: pxa2xx_udc: use debugfs not procfs

Use debugfs instead of /proc/driver/udc

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 62 insertions, 69 deletions

diff --git a/drivers/usb/gadget/pxa2xx_udc.c b/drivers/usb/gadget/pxa2xx_udc.c
index 8bd9ce26bd95..4402d6f042d9 100644
--- a/drivers/usb/gadget/pxa2xx_udc.c
+++ b/drivers/usb/gadget/pxa2xx_udc.c
@@ -24,7 +24,7 @@
  *
  */
 
-// #define      VERBOSE DBG_VERBOSE
+/* #define VERBOSE_DEBUG */
 
 #include <linux/device.h>
 #include <linux/module.h>
@@ -38,13 +38,14 @@
 #include <linux/timer.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
-#include <linux/proc_fs.h>
 #include <linux/mm.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/irq.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
 
 #include <asm/byteorder.h>
 #include <asm/dma.h>
@@ -679,7 +680,7 @@ pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 
         /* kickstart this i/o queue? */
         if (list_empty(&ep->queue) && !ep->stopped) {
-                if (ep->desc == 0 /* ep0 */) {
+                if (ep->desc == NULL/* ep0 */) {
                         unsigned        length = _req->length;
 
                         switch (dev->ep0state) {
@@ -733,7 +734,7 @@ pxa2xx_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
         }
 
         /* pio or dma irq handler advances the queue. */
-        if (likely (req != 0))
+        if (likely(req != NULL))
                 list_add_tail(&req->queue, &ep->queue);
         local_irq_restore(flags);
 
@@ -993,45 +994,32 @@ static const struct usb_gadget_ops pxa2xx_udc_ops = {
 
 /*-------------------------------------------------------------------------*/
 
-#ifdef CONFIG_USB_GADGET_DEBUG_FILES
-
-static const char proc_node_name [] = "driver/udc";
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
 
 static int
-udc_proc_read(char *page, char **start, off_t off, int count,
-                int *eof, void *_dev)
+udc_seq_show(struct seq_file *m, void *d)
 {
-        char                    *buf = page;
-        struct pxa2xx_udc       *dev = _dev;
-        char                    *next = buf;
-        unsigned                size = count;
+        struct pxa2xx_udc       *dev = m->private;
         unsigned long           flags;
-        int                     i, t;
+        int                     i;
         u32                     tmp;
 
-        if (off != 0)
-                return 0;
-
         local_irq_save(flags);
 
         /* basic device status */
-        t = scnprintf(next, size, DRIVER_DESC "\n"
+        seq_printf(m, DRIVER_DESC "\n"
                 "%s version: %s\nGadget driver: %s\nHost %s\n\n",
                 driver_name, DRIVER_VERSION SIZE_STR "(pio)",
                 dev->driver ? dev->driver->driver.name : "(none)",
                 is_vbus_present() ? "full speed" : "disconnected");
-        size -= t;
-        next += t;
 
         /* registers for device and ep0 */
-        t = scnprintf(next, size,
+        seq_printf(m,
                 "uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
-        size -= t;
-        next += t;
 
         tmp = UDCCR;
-        t = scnprintf(next, size,
+        seq_printf(m,
                 "udccr %02X =%s%s%s%s%s%s%s%s\n", tmp,
                 (tmp & UDCCR_REM) ? " rem" : "",
                 (tmp & UDCCR_RSTIR) ? " rstir" : "",
@@ -1041,11 +1029,9 @@ udc_proc_read(char *page, char **start, off_t off, int count,
                 (tmp & UDCCR_RSM) ? " rsm" : "",
                 (tmp & UDCCR_UDA) ? " uda" : "",
                 (tmp & UDCCR_UDE) ? " ude" : "");
-        size -= t;
-        next += t;
 
         tmp = UDCCS0;
-        t = scnprintf(next, size,
+        seq_printf(m,
                 "udccs0 %02X =%s%s%s%s%s%s%s%s\n", tmp,
                 (tmp & UDCCS0_SA) ? " sa" : "",
                 (tmp & UDCCS0_RNE) ? " rne" : "",
@@ -1055,28 +1041,22 @@ udc_proc_read(char *page, char **start, off_t off, int count,
                 (tmp & UDCCS0_FTF) ? " ftf" : "",
                 (tmp & UDCCS0_IPR) ? " ipr" : "",
                 (tmp & UDCCS0_OPR) ? " opr" : "");
-        size -= t;
-        next += t;
 
         if (dev->has_cfr) {
                 tmp = UDCCFR;
-                t = scnprintf(next, size,
+                seq_printf(m,
                         "udccfr %02X =%s%s\n", tmp,
                         (tmp & UDCCFR_AREN) ? " aren" : "",
                         (tmp & UDCCFR_ACM) ? " acm" : "");
-                size -= t;
-                next += t;
         }
 
         if (!is_vbus_present() || !dev->driver)
                 goto done;
 
-        t = scnprintf(next, size, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
+        seq_printf(m, "ep0 IN %lu/%lu, OUT %lu/%lu\nirqs %lu\n\n",
                 dev->stats.write.bytes, dev->stats.write.ops,
                 dev->stats.read.bytes, dev->stats.read.ops,
                 dev->stats.irqs);
-        size -= t;
-        next += t;
 
         /* dump endpoint queues */
         for (i = 0; i < PXA_UDC_NUM_ENDPOINTS; i++) {
@@ -1084,61 +1064,68 @@ udc_proc_read(char *page, char **start, off_t off, int count,
                 struct pxa2xx_request   *req;
 
                 if (i != 0) {
-                        const struct usb_endpoint_descriptor    *d;
+                        const struct usb_endpoint_descriptor    *desc;
 
-                        d = ep->desc;
-                        if (!d)
+                        desc = ep->desc;
+                        if (!desc)
                                 continue;
                         tmp = *dev->ep [i].reg_udccs;
-                        t = scnprintf(next, size,
+                        seq_printf(m,
                                 "%s max %d %s udccs %02x irqs %lu\n",
-                                ep->ep.name, le16_to_cpu (d->wMaxPacketSize),
+                                ep->ep.name, le16_to_cpu(desc->wMaxPacketSize),
                                 "pio", tmp, ep->pio_irqs);
                         /* TODO translate all five groups of udccs bits! */
 
                 } else /* ep0 should only have one transfer queued */
-                        t = scnprintf(next, size, "ep0 max 16 pio irqs %lu\n",
+                        seq_printf(m, "ep0 max 16 pio irqs %lu\n",
                                 ep->pio_irqs);
-                if (t <= 0 || t > size)
-                        goto done;
-                size -= t;
-                next += t;
 
                 if (list_empty(&ep->queue)) {
-                        t = scnprintf(next, size, "\t(nothing queued)\n");
-                        if (t <= 0 || t > size)
-                                goto done;
-                        size -= t;
-                        next += t;
+                        seq_printf(m, "\t(nothing queued)\n");
                         continue;
                 }
                 list_for_each_entry(req, &ep->queue, queue) {
-                        t = scnprintf(next, size,
+                        seq_printf(m,
                                         "\treq %p len %d/%d buf %p\n",
                                         &req->req, req->req.actual,
                                         req->req.length, req->req.buf);
-                        if (t <= 0 || t > size)
-                                goto done;
-                        size -= t;
-                        next += t;
                 }
         }
 
 done:
         local_irq_restore(flags);
-        *eof = 1;
-        return count - size;
+        return 0;
 }
 
-#define create_proc_files() \
-        create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev)
-#define remove_proc_files() \
-        remove_proc_entry(proc_node_name, NULL)
+static int
+udc_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, udc_seq_show, inode->i_private);
+}
+
+static const struct file_operations debug_fops = {
+        .open           = udc_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+        .owner          = THIS_MODULE,
+};
+
+#define create_debug_files(dev) \
+        do { \
+                dev->debugfs_udc = debugfs_create_file(dev->gadget.name, \
+                        S_IRUGO, NULL, dev, &debug_fops); \
+        } while (0)
+#define remove_debug_files(dev) \
+        do { \
+                if (dev->debugfs_udc) \
+                        debugfs_remove(dev->debugfs_udc); \
+        } while (0)
 
 #else   /* !CONFIG_USB_GADGET_DEBUG_FILES */
 
-#define create_proc_files() do {} while (0)
-#define remove_proc_files() do {} while (0)
+#define create_debug_files(dev) do {} while (0)
+#define remove_debug_files(dev) do {} while (0)
 
 #endif  /* CONFIG_USB_GADGET_DEBUG_FILES */
 
@@ -2246,7 +2233,7 @@ lubbock_fail0:
                         goto err_vbus_irq;
                 }
         }
-        create_proc_files();
+        create_debug_files(dev);
 
         return 0;
 
@@ -2283,7 +2270,7 @@ static int __exit pxa2xx_udc_remove(struct platform_device *pdev)
                 return -EBUSY;
 
         udc_disable(dev);
-        remove_proc_files();
+        remove_debug_files(dev);
 
         if (dev->got_irq) {
                 free_irq(platform_get_irq(pdev, 0), dev);
diff --git a/drivers/usb/gadget/pxa2xx_udc.h b/drivers/usb/gadget/pxa2xx_udc.h
index 97a8c45ccd81..b67e3ff5e4eb 100644
--- a/drivers/usb/gadget/pxa2xx_udc.h
+++ b/drivers/usb/gadget/pxa2xx_udc.h
@@ -129,6 +129,10 @@ struct pxa2xx_udc {
         struct pxa2xx_udc_mach_info             *mach;
         u64                                     dma_mask;
         struct pxa2xx_ep                        ep [PXA_UDC_NUM_ENDPOINTS];
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FS
+        struct dentry                           *debugfs_udc;
+#endif
 };
 
 /*-------------------------------------------------------------------------*/
@@ -155,13 +159,15 @@ static struct pxa2xx_udc *the_controller;
 
 #ifdef DEBUG
 
+static int is_vbus_present(void);
+
 static const char *state_name[] = {
         "EP0_IDLE",
         "EP0_IN_DATA_PHASE", "EP0_OUT_DATA_PHASE",
         "EP0_END_XFER", "EP0_STALL"
 };
 
-#ifdef VERBOSE
+#ifdef VERBOSE_DEBUG
 #    define UDC_DEBUG DBG_VERBOSE
 #else
 #    define UDC_DEBUG DBG_NORMAL
@@ -207,7 +213,7 @@ dump_state(struct pxa2xx_udc *dev)
         unsigned        i;
 
         DMSG("%s %s, uicr %02X.%02X, usir %02X.%02x, ufnr %02X.%02X\n",
-                is_usb_connected() ? "host " : "disconnected",
+                is_vbus_present() ? "host " : "disconnected",
                 state_name[dev->ep0state],
                 UICR1, UICR0, USIR1, USIR0, UFNRH, UFNRL);
         dump_udccr("udccr");
@@ -224,7 +230,7 @@ dump_state(struct pxa2xx_udc *dev)
         } else
                 DMSG("ep0 driver '%s'\n", dev->driver->driver.name);
 
-        if (!is_usb_connected())
+        if (!is_vbus_present())
                 return;
 
         dump_udccs0 ("udccs0");
@@ -233,7 +239,7 @@ dump_state(struct pxa2xx_udc *dev)
                 dev->stats.read.bytes, dev->stats.read.ops);
 
         for (i = 1; i < PXA_UDC_NUM_ENDPOINTS; i++) {
-                if (dev->ep [i].desc == 0)
+                if (dev->ep [i].desc == NULL)
                         continue;
                 DMSG ("udccs%d = %02x\n", i, *dev->ep->reg_udccs);
         }