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authorJohan Hovold <jhovold@gmail.com>2010-05-19 00:01:30 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-20 13:21:49 -0700
commit241c80ea72be4828c63f5dd44b142e54d0a12f5d (patch)
treefeeea46c468b0cd71596ef44a7767c3d2e3082b5 /drivers/usb/serial/safe_serial.c
parent39f2f080b39ceb7ccbc0da4bc13fea5698f7fa3a (diff)
downloadlinux-stericsson-241c80ea72be4828c63f5dd44b142e54d0a12f5d.tar.gz
USB: safe_serial: reimplement write using generic framework
Kill custom single-urb write implementation. Note that this driver still depended on the write callback from the old generic framework. Tested against original read processing using a cp210x device in a loopback setup. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/safe_serial.c')
-rw-r--r--drivers/usb/serial/safe_serial.c143
1 files changed, 32 insertions, 111 deletions
diff --git a/drivers/usb/serial/safe_serial.c b/drivers/usb/serial/safe_serial.c
index 43a0cadd5782..915c094ef92c 100644
--- a/drivers/usb/serial/safe_serial.c
+++ b/drivers/usb/serial/safe_serial.c
@@ -1,6 +1,7 @@
/*
* Safe Encapsulated USB Serial Driver
*
+ * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
* Copyright (C) 2001 Lineo
* Copyright (C) 2001 Hewlett-Packard
*
@@ -84,8 +85,8 @@ static int debug;
static int safe = 1;
static int padded = CONFIG_USB_SERIAL_SAFE_PADDED;
-#define DRIVER_VERSION "v0.0b"
-#define DRIVER_AUTHOR "sl@lineo.com, tbr@lineo.com"
+#define DRIVER_VERSION "v0.1"
+#define DRIVER_AUTHOR "sl@lineo.com, tbr@lineo.com, Johan Hovold <jhovold@gmail.com>"
#define DRIVER_DESC "USB Safe Encapsulated Serial"
MODULE_AUTHOR(DRIVER_AUTHOR);
@@ -284,119 +285,40 @@ static void safe_read_bulk_callback(struct urb *urb)
/* FIXME: Need a mechanism to retry later if this happens */
}
-static int safe_write(struct tty_struct *tty, struct usb_serial_port *port,
- const unsigned char *buf, int count)
+static int safe_prepare_write_buffer(struct usb_serial_port *port,
+ void *dest, size_t size)
{
- unsigned char *data;
- int result;
- int i;
- int packet_length;
-
- dbg("safe_write port: %p %d urb: %p count: %d",
- port, port->number, port->write_urb, count);
-
- if (!port->write_urb) {
- dbg("%s - write urb NULL", __func__);
- return 0;
- }
-
- dbg("safe_write write_urb: %d transfer_buffer_length",
- port->write_urb->transfer_buffer_length);
-
- if (!port->write_urb->transfer_buffer_length) {
- dbg("%s - write urb transfer_buffer_length zero", __func__);
- return 0;
- }
- if (count == 0) {
- dbg("%s - write request of 0 bytes", __func__);
- return 0;
- }
- spin_lock_bh(&port->lock);
- if (port->write_urb_busy) {
- spin_unlock_bh(&port->lock);
- dbg("%s - already writing", __func__);
- return 0;
- }
- port->write_urb_busy = 1;
- spin_unlock_bh(&port->lock);
-
- packet_length = port->bulk_out_size; /* get max packetsize */
-
- i = packet_length - (safe ? 2 : 0); /* get bytes to send */
- count = (count > i) ? i : count;
-
-
- /* get the data into the transfer buffer */
- data = port->write_urb->transfer_buffer;
- memset(data, '0', packet_length);
-
- memcpy(data, buf, count);
-
- if (safe) {
- __u16 fcs;
-
- /* pad if necessary */
- if (!padded)
- packet_length = count + 2;
- /* set count */
- data[packet_length - 2] = count << 2;
- data[packet_length - 1] = 0;
-
- /* compute fcs and insert into trailer */
- fcs = fcs_compute10(data, packet_length, CRC10_INITFCS);
- data[packet_length - 2] |= fcs >> 8;
- data[packet_length - 1] |= fcs & 0xff;
-
- /* set length to send */
- port->write_urb->transfer_buffer_length = packet_length;
+ unsigned char *buf = dest;
+ int count;
+ int trailer_len;
+ int pkt_len;
+ __u16 fcs;
+
+ trailer_len = safe ? 2 : 0;
+
+ count = kfifo_out_locked(&port->write_fifo, buf, size - trailer_len,
+ &port->lock);
+ if (!safe)
+ return count;
+
+ /* pad if necessary */
+ if (padded) {
+ pkt_len = size;
+ memset(buf + count, '0', pkt_len - count - trailer_len);
} else {
- port->write_urb->transfer_buffer_length = count;
- }
-
- usb_serial_debug_data(debug, &port->dev, __func__, count,
- port->write_urb->transfer_buffer);
-#ifdef ECHO_TX
- {
- int i;
- unsigned char *cp = port->write_urb->transfer_buffer;
- for (i = 0; i < port->write_urb->transfer_buffer_length; i++) {
- if ((i % 32) == 0)
- printk("\nsu[%02x] ", i);
- printk("%02x ", *cp++);
- }
- printk("\n");
+ pkt_len = count + trailer_len;
}
-#endif
- port->write_urb->dev = port->serial->dev;
- result = usb_submit_urb(port->write_urb, GFP_KERNEL);
- if (result) {
- port->write_urb_busy = 0;
- dev_err(&port->dev,
- "%s - failed submitting write urb, error %d\n",
- __func__, result);
- return 0;
- }
- dbg("%s urb: %p submitted", __func__, port->write_urb);
- return count;
-}
-
-static int safe_write_room(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- int room = 0; /* Default: no room */
- unsigned long flags;
-
- dbg("%s", __func__);
+ /* set count */
+ buf[pkt_len - 2] = count << 2;
+ buf[pkt_len - 1] = 0;
- spin_lock_irqsave(&port->lock, flags);
- if (port->write_urb_busy)
- room = port->bulk_out_size - (safe ? 2 : 0);
- spin_unlock_irqrestore(&port->lock, flags);
+ /* compute fcs and insert into trailer */
+ fcs = fcs_compute10(buf, pkt_len, CRC10_INITFCS);
+ buf[pkt_len - 2] |= fcs >> 8;
+ buf[pkt_len - 1] |= fcs & 0xff;
- if (room)
- dbg("safe_write_room returns %d", room);
- return room;
+ return pkt_len;
}
static int safe_startup(struct usb_serial *serial)
@@ -421,9 +343,8 @@ static struct usb_serial_driver safe_device = {
.id_table = id_table,
.usb_driver = &safe_driver,
.num_ports = 1,
- .write = safe_write,
- .write_room = safe_write_room,
.read_bulk_callback = safe_read_bulk_callback,
+ .prepare_write_buffer = safe_prepare_write_buffer,
.attach = safe_startup,
};