diff options
Diffstat (limited to 'drivers/usb/serial/airprime.c')
| -rw-r--r-- | drivers/usb/serial/airprime.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/usb/serial/airprime.c b/drivers/usb/serial/airprime.c new file mode 100644 index 000000000000..b3f1d1e82468 --- /dev/null +++ b/drivers/usb/serial/airprime.c @@ -0,0 +1,355 @@ +/* + * AirPrime CDMA Wireless Serial USB driver + * + * Copyright (C) 2005-2006 Greg Kroah-Hartman <gregkh@suse.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> + +static struct usb_device_id id_table [] = { + { USB_DEVICE(0x0c88, 0x17da) }, /* Kyocera Wireless KPC650/Passport */ + { }, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +#define URB_TRANSFER_BUFFER_SIZE 4096 +#define NUM_READ_URBS 4 +#define NUM_WRITE_URBS 4 +#define NUM_BULK_EPS 3 +#define MAX_BULK_EPS 6 + +/* if overridden by the user, then use their value for the size of the + * read and write urbs, and the number of endpoints */ +static int buffer_size = URB_TRANSFER_BUFFER_SIZE; +static int endpoints = NUM_BULK_EPS; +static int debug; +struct airprime_private { + spinlock_t lock; + int outstanding_urbs; + int throttled; + struct urb *read_urbp[NUM_READ_URBS]; + + /* Settings for the port */ + int rts_state; /* Handshaking pins (outputs) */ + int dtr_state; + int cts_state; /* Handshaking pins (inputs) */ + int dsr_state; + int dcd_state; + int ri_state; +}; + +static int airprime_send_setup(struct usb_serial_port *port) +{ + struct usb_serial *serial = port->serial; + struct airprime_private *priv; + + dbg("%s", __func__); + + if (port->number != 0) + return 0; + + priv = usb_get_serial_port_data(port); + + if (port->port.tty) { + int val = 0; + if (priv->dtr_state) + val |= 0x01; + if (priv->rts_state) + val |= 0x02; + + return usb_control_msg(serial->dev, + usb_rcvctrlpipe(serial->dev, 0), + 0x22, 0x21, val, 0, NULL, 0, + USB_CTRL_SET_TIMEOUT); + } + + return 0; +} + +static void airprime_read_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + unsigned char *data = urb->transfer_buffer; + struct tty_struct *tty; + int result; + int status = urb->status; + + dbg("%s - port %d", __func__, port->number); + + if (status) { + dbg("%s - nonzero read bulk status received: %d", + __func__, status); + return; + } + usb_serial_debug_data(debug, &port->dev, __func__, + urb->actual_length, data); + + tty = port->port.tty; + if (tty && urb->actual_length) { + tty_insert_flip_string(tty, data, urb->actual_length); + tty_flip_buffer_push(tty); + } + + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(&port->dev, + "%s - failed resubmitting read urb, error %d\n", + __func__, result); + return; +} + +static void airprime_write_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + struct airprime_private *priv = usb_get_serial_port_data(port); + int status = urb->status; + unsigned long flags; + + dbg("%s - port %d", __func__, port->number); + + /* free up the transfer buffer, as usb_free_urb() does not do this */ + kfree(urb->transfer_buffer); + + if (status) + dbg("%s - nonzero write bulk status received: %d", + __func__, status); + spin_lock_irqsave(&priv->lock, flags); + --priv->outstanding_urbs; + spin_unlock_irqrestore(&priv->lock, flags); + + usb_serial_port_softint(port); +} + +static int airprime_open(struct tty_struct *tty, struct usb_serial_port *port, + struct file *filp) +{ + struct airprime_private *priv = usb_get_serial_port_data(port); + struct usb_serial *serial = port->serial; + struct urb *urb; + char *buffer = NULL; + int i; + int result = 0; + + dbg("%s - port %d", __func__, port->number); + + /* initialize our private data structure if it isn't already created */ + if (!priv) { + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + result = -ENOMEM; + goto out; + } + spin_lock_init(&priv->lock); + usb_set_serial_port_data(port, priv); + } + + /* Set some sane defaults */ + priv->rts_state = 1; + priv->dtr_state = 1; + + for (i = 0; i < NUM_READ_URBS; ++i) { + buffer = kmalloc(buffer_size, GFP_KERNEL); + if (!buffer) { + dev_err(&port->dev, "%s - out of memory.\n", + __func__); + result = -ENOMEM; + goto errout; + } + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + kfree(buffer); + dev_err(&port->dev, "%s - no more urbs?\n", + __func__); + result = -ENOMEM; + goto errout; + } + usb_fill_bulk_urb(urb, serial->dev, + usb_rcvbulkpipe(serial->dev, + port->bulk_out_endpointAddress), + buffer, buffer_size, + airprime_read_bulk_callback, port); + result = usb_submit_urb(urb, GFP_KERNEL); + if (result) { + usb_free_urb(urb); + kfree(buffer); + dev_err(&port->dev, + "%s - failed submitting read urb %d for port %d, error %d\n", + __func__, i, port->number, result); + goto errout; + } + /* remember this urb so we can kill it when the + port is closed */ + priv->read_urbp[i] = urb; + } + + airprime_send_setup(port); + + goto out; + + errout: + /* some error happened, cancel any submitted urbs and clean up + anything that got allocated successfully */ + + while (i-- != 0) { + urb = priv->read_urbp[i]; + buffer = urb->transfer_buffer; + usb_kill_urb(urb); + usb_free_urb(urb); + kfree(buffer); + } + + out: + return result; +} + +static void airprime_close(struct tty_struct *tty, + struct usb_serial_port *port, struct file *filp) +{ + struct airprime_private *priv = usb_get_serial_port_data(port); + int i; + + dbg("%s - port %d", __func__, port->number); + + priv->rts_state = 0; + priv->dtr_state = 0; + + mutex_lock(&port->serial->disc_mutex); + if (!port->serial->disconnected) + airprime_send_setup(port); + mutex_unlock(&port->serial->disc_mutex); + + for (i = 0; i < NUM_READ_URBS; ++i) { + usb_kill_urb(priv->read_urbp[i]); + kfree(priv->read_urbp[i]->transfer_buffer); + usb_free_urb(priv->read_urbp[i]); + } + + /* free up private structure */ + kfree(priv); + usb_set_serial_port_data(port, NULL); +} + +static int airprime_write(struct tty_struct *tty, struct usb_serial_port *port, + const unsigned char *buf, int count) +{ + struct airprime_private *priv = usb_get_serial_port_data(port); + struct usb_serial *serial = port->serial; + struct urb *urb; + unsigned char *buffer; + unsigned long flags; + int status; + dbg("%s - port %d", __func__, port->number); + + spin_lock_irqsave(&priv->lock, flags); + if (priv->outstanding_urbs > NUM_WRITE_URBS) { + spin_unlock_irqrestore(&priv->lock, flags); + dbg("%s - write limit hit\n", __func__); + return 0; + } + spin_unlock_irqrestore(&priv->lock, flags); + buffer = kmalloc(count, GFP_ATOMIC); + if (!buffer) { + dev_err(&port->dev, "out of memory\n"); + return -ENOMEM; + } + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) { + dev_err(&port->dev, "no more free urbs\n"); + kfree(buffer); + return -ENOMEM; + } + memcpy(buffer, buf, count); + + usb_serial_debug_data(debug, &port->dev, __func__, count, buffer); + + usb_fill_bulk_urb(urb, serial->dev, + usb_sndbulkpipe(serial->dev, + port->bulk_out_endpointAddress), + buffer, count, + airprime_write_bulk_callback, port); + + /* send it down the pipe */ + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) { + dev_err(&port->dev, + "%s - usb_submit_urb(write bulk) failed with status = %d\n", + __func__, status); + count = status; + kfree(buffer); + } else { + spin_lock_irqsave(&priv->lock, flags); + ++priv->outstanding_urbs; + spin_unlock_irqrestore(&priv->lock, flags); + } + /* we are done with this urb, so let the host driver + * really free it when it is finished with it */ + usb_free_urb(urb); + return count; +} + +static struct usb_driver airprime_driver = { + .name = "airprime", + .probe = usb_serial_probe, + .disconnect = usb_serial_disconnect, + .id_table = id_table, + .no_dynamic_id = 1, +}; + +static struct usb_serial_driver airprime_device = { + .driver = { + .owner = THIS_MODULE, + .name = "airprime", + }, + .usb_driver = &airprime_driver, + .id_table = id_table, + .open = airprime_open, + .close = airprime_close, + .write = airprime_write, +}; + +static int __init airprime_init(void) +{ + int retval; + + airprime_device.num_ports = endpoints; + if (endpoints < 0 || endpoints >= MAX_BULK_EPS) + airprime_device.num_ports = NUM_BULK_EPS; + + retval = usb_serial_register(&airprime_device); + if (retval) + return retval; + retval = usb_register(&airprime_driver); + if (retval) + usb_serial_deregister(&airprime_device); + return retval; +} + +static void __exit airprime_exit(void) +{ + dbg("%s", __func__); + + usb_deregister(&airprime_driver); + usb_serial_deregister(&airprime_device); +} + +module_init(airprime_init); +module_exit(airprime_exit); +MODULE_LICENSE("GPL"); + +module_param(debug, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Debug enabled"); +module_param(buffer_size, int, 0); +MODULE_PARM_DESC(buffer_size, + "Size of the transfer buffers in bytes (default 4096)"); +module_param(endpoints, int, 0); +MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)"); |