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Date: Fri, 29 Feb 2008 10:02:18 +0100
From: Dirk Eibach <eibach@...ys.de>
To: linux-kernel@...r.kernel.org
Cc: greg@...ah.com
Subject: [PATCH] usb: add sysfs configuration interface for CP2101
From: Dirk Eibach <eibach@...ys.de>
The usb configuration data for the Silabs CP2101 usb to uart bridge
controller can be customized:
- Vendor ID
- Product ID
- Power Descriptor
- Release Number
- Serial Number
- Product Description String
Silabs provides a windows-only tool to do that.
Since we use linux-only machines in our production-environment, we have no
proper way to customize the chips for our purpose.
So I added sysfs configuration support to the linux driver.
Signed-off-by: Dirk Eibach <eibach@...ys.de>
---
diff -purN linux-2.6.24/drivers/usb/serial/cp2101.c linux-2.6.24-diff/drivers/usb/serial/cp2101.c
--- linux-2.6.24/drivers/usb/serial/cp2101.c 2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24-diff/drivers/usb/serial/cp2101.c 2008-02-29 09:38:30.847817025 +0100
@@ -18,6 +18,8 @@
*/
#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
@@ -52,6 +54,8 @@ static void cp2101_shutdown(struct usb_s
static int debug;
+bool enable_config = false;
+
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
{ USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
@@ -125,6 +129,7 @@ static struct usb_serial_driver cp2101_d
#define CP2101_CONTROL 0x07 /* Flow control line states */
#define CP2101_MODEMCTL 0x13 /* Modem controls */
#define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
+#define CP2101_EEPROM 0xFF /* write configuration eeprom */
/* CP2101_UART */
#define UART_ENABLE 0x0001
@@ -167,6 +172,17 @@ static struct usb_serial_driver cp2101_d
#define CONTROL_WRITE_DTR 0x0100
#define CONTROL_WRITE_RTS 0x0200
+/* CP2101 CONFIGURATION EEPROM */
+#define EEPROM_RELOAD 0x0008
+#define EEPROM_VID 0x3701
+#define EEPROM_PID 0x3702
+#define EEPROM_PRODUCTSTRING 0x3703
+#define EEPROM_SERIALNUMBER 0x3704
+#define EEPROM_POWER_ATTRIB 0x3705
+#define EEPROM_MAX_POWER 0x3706
+#define EEPROM_RELEASE_VERSION 0x3707
+#define EEPROM_LOCK 0x370a
+
/*
* cp2101_get_config
* Reads from the CP2101 configuration registers
@@ -704,11 +720,262 @@ static void cp2101_break_ctl (struct usb
cp2101_set_config(port, CP2101_BREAK, &state, 2);
}
+static ssize_t write_reload(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ /* writing "0" does not trigger */
+ if (!simple_strtoul(buf, NULL, 0))
+ return count;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_RELOAD,
+ 0, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(reload, S_IWUGO, NULL, write_reload);
+
+static ssize_t write_vid(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long vid = simple_strtoul(buf, NULL, 0);
+
+ if (!vid || vid > 0xffff)
+ return -EINVAL;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_VID,
+ vid, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(vid, S_IWUGO, NULL, write_vid);
+
+static ssize_t write_pid(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long pid = simple_strtoul(buf, NULL, 0);
+
+ if (!pid || pid > 0xffff)
+ return -EINVAL;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_PID,
+ pid, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(pid, S_IWUGO, NULL, write_pid);
+
+static ssize_t write_serialnumber(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int result;
+ unsigned int k;
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+ u8 serial_stringsize = 2 + 2*count;
+ char serial[serial_stringsize];
+
+ if (count > 63)
+ return -EINVAL;
+
+ serial[0] = serial_stringsize;
+ serial[1] = USB_DT_STRING;
+
+ /* convert to utf-16 */
+ for (k = 0; k < count; ++k) {
+ serial[2+2*k] = buf[k];
+ serial[2+2*k+1] = 0;
+ }
+
+ result = usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_SERIALNUMBER,
+ 0, serial, sizeof(serial), 300);
+
+ if (result != serial_stringsize)
+ return -EIO;
+
+ return count;
+}
+
+static DEVICE_ATTR(serialnumber, S_IWUGO, NULL, write_serialnumber);
+
+
+static ssize_t write_productstring(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ int result;
+ unsigned int k;
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+ u8 product_stringsize = 2 + 2*count;
+ char product[product_stringsize];
+
+ if (count > 126)
+ return -EINVAL;
+
+ product[0] = product_stringsize;
+ product[1] = USB_DT_STRING;
+
+ /* convert to utf-16 */
+ for (k = 0; k < count; ++k) {
+ product[2+2*k] = buf[k];
+ product[2+2*k+1] = 0;
+ }
+
+ result = usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE,
+ EEPROM_PRODUCTSTRING, 0,
+ product, sizeof(product), 300);
+
+ if (result != product_stringsize)
+ return -EIO;
+
+ return count;
+}
+
+static DEVICE_ATTR(productstring, S_IWUGO, NULL, write_productstring);
+
+static ssize_t write_self_powered(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long self_powered = simple_strtoul(buf, NULL, 0);
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_POWER_ATTRIB,
+ self_powered ? 0x00c0 : 0x0080, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(self_powered, S_IWUGO, NULL, write_self_powered);
+
+static ssize_t write_max_power(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long max_power = simple_strtoul(buf, NULL, 0);
+
+ if (!max_power || max_power > 0xff)
+ return -EINVAL;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_MAX_POWER,
+ max_power, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(max_power, S_IWUGO, NULL, write_max_power);
+
+static ssize_t write_release_version(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long release_version = simple_strtoul(buf, NULL, 0);
+
+ if (release_version > 0xffff)
+ return -EINVAL;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_RELEASE_VERSION,
+ release_version, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(release_version, S_IWUGO, NULL, write_release_version);
+
+static ssize_t write_lock_forever(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device *usbdev = container_of(dev, struct usb_device, dev);
+
+ unsigned long lock = simple_strtoul(buf, NULL, 0);
+
+ /* be really, really sure to know what you are doing here */
+ if (lock != 0xabadbabe)
+ return -EINVAL;
+
+ usb_control_msg(usbdev,
+ usb_sndctrlpipe(usbdev, 0),
+ CP2101_EEPROM, REQTYPE_HOST_TO_DEVICE, EEPROM_LOCK,
+ 0x00f0, NULL, 0, 300);
+
+ return count;
+}
+
+static DEVICE_ATTR(lock_forever, S_IWUGO, NULL, write_lock_forever);
+
static int cp2101_startup (struct usb_serial *serial)
{
+ int err;
+
/* CP2101 buffers behave strangely unless device is reset */
usb_reset_device(serial->dev);
+
+ if (!enable_config)
+ return 0;
+
+ err = device_create_file(&serial->dev->dev, &dev_attr_reload);
+ if (err) goto out;
+ err = device_create_file(&serial->dev->dev, &dev_attr_vid);
+ if (err) goto out_reload;
+ err = device_create_file(&serial->dev->dev, &dev_attr_pid);
+ if (err) goto out_vid;
+ err = device_create_file(&serial->dev->dev, &dev_attr_productstring);
+ if (err) goto out_pid;
+ err = device_create_file(&serial->dev->dev, &dev_attr_serialnumber);
+ if (err) goto out_productstring;
+ err = device_create_file(&serial->dev->dev, &dev_attr_self_powered);
+ if (err) goto out_serialnumber;
+ err = device_create_file(&serial->dev->dev, &dev_attr_max_power);
+ if (err) goto out_self_powered;
+ err = device_create_file(&serial->dev->dev, &dev_attr_release_version);
+ if (err) goto out_max_power;
+ err = device_create_file(&serial->dev->dev, &dev_attr_lock_forever);
+ if (err) goto out_release_version;
+
return 0;
+
+out_release_version:
+ device_remove_file(&serial->dev->dev, &dev_attr_release_version);
+out_max_power:
+ device_remove_file(&serial->dev->dev, &dev_attr_max_power);
+out_self_powered:
+ device_remove_file(&serial->dev->dev, &dev_attr_self_powered);
+out_serialnumber:
+ device_remove_file(&serial->dev->dev, &dev_attr_serialnumber);
+out_productstring:
+ device_remove_file(&serial->dev->dev, &dev_attr_productstring);
+out_pid:
+ device_remove_file(&serial->dev->dev, &dev_attr_pid);
+out_vid:
+ device_remove_file(&serial->dev->dev, &dev_attr_vid);
+out_reload:
+ device_remove_file(&serial->dev->dev, &dev_attr_reload);
+out:
+ return err;
}
static void cp2101_shutdown (struct usb_serial *serial)
@@ -721,6 +988,19 @@ static void cp2101_shutdown (struct usb_
for (i=0; i < serial->num_ports; ++i) {
cp2101_cleanup(serial->port[i]);
}
+
+ if (!enable_config)
+ return;
+
+ device_remove_file(&serial->dev->dev, &dev_attr_reload);
+ device_remove_file(&serial->dev->dev, &dev_attr_vid);
+ device_remove_file(&serial->dev->dev, &dev_attr_pid);
+ device_remove_file(&serial->dev->dev, &dev_attr_productstring);
+ device_remove_file(&serial->dev->dev, &dev_attr_serialnumber);
+ device_remove_file(&serial->dev->dev, &dev_attr_self_powered);
+ device_remove_file(&serial->dev->dev, &dev_attr_max_power);
+ device_remove_file(&serial->dev->dev, &dev_attr_release_version);
+ device_remove_file(&serial->dev->dev, &dev_attr_lock_forever);
}
static int __init cp2101_init (void)
@@ -758,3 +1038,6 @@ MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
+
+module_param(enable_config, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(enable_config, "Enable sysfs access to configuration eeprom.");
diff -purN linux-2.6.24/drivers/usb/serial/cp2101.c.orig linux-2.6.24-diff/drivers/usb/serial/cp2101.c.orig
--- linux-2.6.24/drivers/usb/serial/cp2101.c.orig 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.24-diff/drivers/usb/serial/cp2101.c.orig 2008-01-24 23:58:37.000000000 +0100
@@ -0,0 +1,760 @@
+/*
+ * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
+ *
+ * Copyright (C) 2005 Craig Shelley (craig@...rotron.org.uk)
+ *
+ * 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.
+ *
+ * Support to set flow control line levels using TIOCMGET and TIOCMSET
+ * thanks to Karl Hiramoto karl@...amoto.org. RTSCTS hardware flow
+ * control thanks to Munir Nassar nassarmu@...l-time.com
+ *
+ * Outstanding Issues:
+ * Buffers are not flushed when the port is opened.
+ * Multiple calls to write() may fail with "Resource temporarily unavailable"
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/usb.h>
+#include <asm/uaccess.h>
+#include <linux/usb/serial.h>
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.07"
+#define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
+
+/*
+ * Function Prototypes
+ */
+static int cp2101_open(struct usb_serial_port*, struct file*);
+static void cp2101_cleanup(struct usb_serial_port*);
+static void cp2101_close(struct usb_serial_port*, struct file*);
+static void cp2101_get_termios(struct usb_serial_port*);
+static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
+static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
+static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
+ unsigned int, unsigned int);
+static void cp2101_break_ctl(struct usb_serial_port*, int);
+static int cp2101_startup (struct usb_serial *);
+static void cp2101_shutdown(struct usb_serial*);
+
+
+static int debug;
+
+static struct usb_device_id id_table [] = {
+ { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
+ { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
+ { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
+ { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
+ { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
+ { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
+ { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
+ { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
+ { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
+ { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
+ { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
+ { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
+ { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
+ { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
+ { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
+ { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
+ { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
+ { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
+ { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
+ { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
+ { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
+ { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
+ { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
+ { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
+ { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
+ { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
+ { } /* Terminating Entry */
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct usb_driver cp2101_driver = {
+ .name = "cp2101",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table,
+ .no_dynamic_id = 1,
+};
+
+static struct usb_serial_driver cp2101_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "cp2101",
+ },
+ .usb_driver = &cp2101_driver,
+ .id_table = id_table,
+ .num_interrupt_in = 0,
+ .num_bulk_in = NUM_DONT_CARE,
+ .num_bulk_out = NUM_DONT_CARE,
+ .num_ports = 1,
+ .open = cp2101_open,
+ .close = cp2101_close,
+ .break_ctl = cp2101_break_ctl,
+ .set_termios = cp2101_set_termios,
+ .tiocmget = cp2101_tiocmget,
+ .tiocmset = cp2101_tiocmset,
+ .attach = cp2101_startup,
+ .shutdown = cp2101_shutdown,
+};
+
+/* Config request types */
+#define REQTYPE_HOST_TO_DEVICE 0x41
+#define REQTYPE_DEVICE_TO_HOST 0xc1
+
+/* Config SET requests. To GET, add 1 to the request number */
+#define CP2101_UART 0x00 /* Enable / Disable */
+#define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */
+#define CP2101_BITS 0x03 /* 0x(0)(databits)(parity)(stopbits) */
+#define CP2101_BREAK 0x05 /* On / Off */
+#define CP2101_CONTROL 0x07 /* Flow control line states */
+#define CP2101_MODEMCTL 0x13 /* Modem controls */
+#define CP2101_CONFIG_6 0x19 /* 6 bytes of config data ??? */
+
+/* CP2101_UART */
+#define UART_ENABLE 0x0001
+#define UART_DISABLE 0x0000
+
+/* CP2101_BAUDRATE */
+#define BAUD_RATE_GEN_FREQ 0x384000
+
+/* CP2101_BITS */
+#define BITS_DATA_MASK 0X0f00
+#define BITS_DATA_5 0X0500
+#define BITS_DATA_6 0X0600
+#define BITS_DATA_7 0X0700
+#define BITS_DATA_8 0X0800
+#define BITS_DATA_9 0X0900
+
+#define BITS_PARITY_MASK 0x00f0
+#define BITS_PARITY_NONE 0x0000
+#define BITS_PARITY_ODD 0x0010
+#define BITS_PARITY_EVEN 0x0020
+#define BITS_PARITY_MARK 0x0030
+#define BITS_PARITY_SPACE 0x0040
+
+#define BITS_STOP_MASK 0x000f
+#define BITS_STOP_1 0x0000
+#define BITS_STOP_1_5 0x0001
+#define BITS_STOP_2 0x0002
+
+/* CP2101_BREAK */
+#define BREAK_ON 0x0000
+#define BREAK_OFF 0x0001
+
+/* CP2101_CONTROL */
+#define CONTROL_DTR 0x0001
+#define CONTROL_RTS 0x0002
+#define CONTROL_CTS 0x0010
+#define CONTROL_DSR 0x0020
+#define CONTROL_RING 0x0040
+#define CONTROL_DCD 0x0080
+#define CONTROL_WRITE_DTR 0x0100
+#define CONTROL_WRITE_RTS 0x0200
+
+/*
+ * cp2101_get_config
+ * Reads from the CP2101 configuration registers
+ * 'size' is specified in bytes.
+ * 'data' is a pointer to a pre-allocated array of integers large
+ * enough to hold 'size' bytes (with 4 bytes to each integer)
+ */
+static int cp2101_get_config(struct usb_serial_port* port, u8 request,
+ unsigned int *data, int size)
+{
+ struct usb_serial *serial = port->serial;
+ __le32 *buf;
+ int result, i, length;
+
+ /* Number of integers required to contain the array */
+ length = (((size - 1) | 3) + 1)/4;
+
+ buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
+ if (!buf) {
+ dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ /* For get requests, the request number must be incremented */
+ request++;
+
+ /* Issue the request, attempting to read 'size' bytes */
+ result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
+ request, REQTYPE_DEVICE_TO_HOST, 0x0000,
+ 0, buf, size, 300);
+
+ /* Convert data into an array of integers */
+ for (i=0; i<length; i++)
+ data[i] = le32_to_cpu(buf[i]);
+
+ kfree(buf);
+
+ if (result != size) {
+ dev_err(&port->dev, "%s - Unable to send config request, "
+ "request=0x%x size=%d result=%d\n",
+ __FUNCTION__, request, size, result);
+ return -EPROTO;
+ }
+
+ return 0;
+}
+
+/*
+ * cp2101_set_config
+ * Writes to the CP2101 configuration registers
+ * Values less than 16 bits wide are sent directly
+ * 'size' is specified in bytes.
+ */
+static int cp2101_set_config(struct usb_serial_port* port, u8 request,
+ unsigned int *data, int size)
+{
+ struct usb_serial *serial = port->serial;
+ __le32 *buf;
+ int result, i, length;
+
+ /* Number of integers required to contain the array */
+ length = (((size - 1) | 3) + 1)/4;
+
+ buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
+ if (!buf) {
+ dev_err(&port->dev, "%s - out of memory.\n",
+ __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ /* Array of integers into bytes */
+ for (i = 0; i < length; i++)
+ buf[i] = cpu_to_le32(data[i]);
+
+ if (size > 2) {
+ result = usb_control_msg (serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ request, REQTYPE_HOST_TO_DEVICE, 0x0000,
+ 0, buf, size, 300);
+ } else {
+ result = usb_control_msg (serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ request, REQTYPE_HOST_TO_DEVICE, data[0],
+ 0, NULL, 0, 300);
+ }
+
+ kfree(buf);
+
+ if ((size > 2 && result != size) || result < 0) {
+ dev_err(&port->dev, "%s - Unable to send request, "
+ "request=0x%x size=%d result=%d\n",
+ __FUNCTION__, request, size, result);
+ return -EPROTO;
+ }
+
+ /* Single data value */
+ result = usb_control_msg (serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ request, REQTYPE_HOST_TO_DEVICE, data[0],
+ 0, NULL, 0, 300);
+ return 0;
+}
+
+/*
+ * cp2101_set_config_single
+ * Convenience function for calling cp2101_set_config on single data values
+ * without requiring an integer pointer
+ */
+static inline int cp2101_set_config_single(struct usb_serial_port* port,
+ u8 request, unsigned int data)
+{
+ return cp2101_set_config(port, request, &data, 2);
+}
+
+static int cp2101_open (struct usb_serial_port *port, struct file *filp)
+{
+ struct usb_serial *serial = port->serial;
+ int result;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
+ dev_err(&port->dev, "%s - Unable to enable UART\n",
+ __FUNCTION__);
+ return -EPROTO;
+ }
+
+ /* Start reading from the device */
+ usb_fill_bulk_urb (port->read_urb, serial->dev,
+ usb_rcvbulkpipe(serial->dev,
+ port->bulk_in_endpointAddress),
+ port->read_urb->transfer_buffer,
+ port->read_urb->transfer_buffer_length,
+ serial->type->read_bulk_callback,
+ port);
+ result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+ if (result) {
+ dev_err(&port->dev, "%s - failed resubmitting read urb, "
+ "error %d\n", __FUNCTION__, result);
+ return result;
+ }
+
+ /* Configure the termios structure */
+ cp2101_get_termios(port);
+
+ /* Set the DTR and RTS pins low */
+ cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
+
+ return 0;
+}
+
+static void cp2101_cleanup (struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (serial->dev) {
+ /* shutdown any bulk reads that might be going on */
+ if (serial->num_bulk_out)
+ usb_kill_urb(port->write_urb);
+ if (serial->num_bulk_in)
+ usb_kill_urb(port->read_urb);
+ }
+}
+
+static void cp2101_close (struct usb_serial_port *port, struct file * filp)
+{
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /* shutdown our urbs */
+ dbg("%s - shutting down urbs", __FUNCTION__);
+ usb_kill_urb(port->write_urb);
+ usb_kill_urb(port->read_urb);
+
+ cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
+}
+
+/*
+ * cp2101_get_termios
+ * Reads the baud rate, data bits, parity, stop bits and flow control mode
+ * from the device, corrects any unsupported values, and configures the
+ * termios structure to reflect the state of the device
+ */
+static void cp2101_get_termios (struct usb_serial_port *port)
+{
+ unsigned int cflag, modem_ctl[4];
+ int baud;
+ int bits;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (!port->tty || !port->tty->termios) {
+ dbg("%s - no tty structures", __FUNCTION__);
+ return;
+ }
+
+ cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
+ /* Convert to baudrate */
+ if (baud)
+ baud = BAUD_RATE_GEN_FREQ / baud;
+
+ dbg("%s - baud rate = %d", __FUNCTION__, baud);
+
+ tty_encode_baud_rate(port->tty, baud, baud);
+ cflag = port->tty->termios->c_cflag;
+
+ cp2101_get_config(port, CP2101_BITS, &bits, 2);
+ cflag &= ~CSIZE;
+ switch(bits & BITS_DATA_MASK) {
+ case BITS_DATA_5:
+ dbg("%s - data bits = 5", __FUNCTION__);
+ cflag |= CS5;
+ break;
+ case BITS_DATA_6:
+ dbg("%s - data bits = 6", __FUNCTION__);
+ cflag |= CS6;
+ break;
+ case BITS_DATA_7:
+ dbg("%s - data bits = 7", __FUNCTION__);
+ cflag |= CS7;
+ break;
+ case BITS_DATA_8:
+ dbg("%s - data bits = 8", __FUNCTION__);
+ cflag |= CS8;
+ break;
+ case BITS_DATA_9:
+ dbg("%s - data bits = 9 (not supported, "
+ "using 8 data bits)", __FUNCTION__);
+ cflag |= CS8;
+ bits &= ~BITS_DATA_MASK;
+ bits |= BITS_DATA_8;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ default:
+ dbg("%s - Unknown number of data bits, "
+ "using 8", __FUNCTION__);
+ cflag |= CS8;
+ bits &= ~BITS_DATA_MASK;
+ bits |= BITS_DATA_8;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ }
+
+ switch(bits & BITS_PARITY_MASK) {
+ case BITS_PARITY_NONE:
+ dbg("%s - parity = NONE", __FUNCTION__);
+ cflag &= ~PARENB;
+ break;
+ case BITS_PARITY_ODD:
+ dbg("%s - parity = ODD", __FUNCTION__);
+ cflag |= (PARENB|PARODD);
+ break;
+ case BITS_PARITY_EVEN:
+ dbg("%s - parity = EVEN", __FUNCTION__);
+ cflag &= ~PARODD;
+ cflag |= PARENB;
+ break;
+ case BITS_PARITY_MARK:
+ dbg("%s - parity = MARK (not supported, "
+ "disabling parity)", __FUNCTION__);
+ cflag &= ~PARENB;
+ bits &= ~BITS_PARITY_MASK;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ case BITS_PARITY_SPACE:
+ dbg("%s - parity = SPACE (not supported, "
+ "disabling parity)", __FUNCTION__);
+ cflag &= ~PARENB;
+ bits &= ~BITS_PARITY_MASK;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ default:
+ dbg("%s - Unknown parity mode, "
+ "disabling parity", __FUNCTION__);
+ cflag &= ~PARENB;
+ bits &= ~BITS_PARITY_MASK;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ }
+
+ cflag &= ~CSTOPB;
+ switch(bits & BITS_STOP_MASK) {
+ case BITS_STOP_1:
+ dbg("%s - stop bits = 1", __FUNCTION__);
+ break;
+ case BITS_STOP_1_5:
+ dbg("%s - stop bits = 1.5 (not supported, "
+ "using 1 stop bit)", __FUNCTION__);
+ bits &= ~BITS_STOP_MASK;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ case BITS_STOP_2:
+ dbg("%s - stop bits = 2", __FUNCTION__);
+ cflag |= CSTOPB;
+ break;
+ default:
+ dbg("%s - Unknown number of stop bits, "
+ "using 1 stop bit", __FUNCTION__);
+ bits &= ~BITS_STOP_MASK;
+ cp2101_set_config(port, CP2101_BITS, &bits, 2);
+ break;
+ }
+
+ cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
+ if (modem_ctl[0] & 0x0008) {
+ dbg("%s - flow control = CRTSCTS", __FUNCTION__);
+ cflag |= CRTSCTS;
+ } else {
+ dbg("%s - flow control = NONE", __FUNCTION__);
+ cflag &= ~CRTSCTS;
+ }
+
+ port->tty->termios->c_cflag = cflag;
+}
+
+static void cp2101_set_termios (struct usb_serial_port *port,
+ struct ktermios *old_termios)
+{
+ unsigned int cflag, old_cflag;
+ int baud=0, bits;
+ unsigned int modem_ctl[4];
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (!port->tty || !port->tty->termios) {
+ dbg("%s - no tty structures", __FUNCTION__);
+ return;
+ }
+ port->tty->termios->c_cflag &= ~CMSPAR;
+
+ cflag = port->tty->termios->c_cflag;
+ old_cflag = old_termios->c_cflag;
+ baud = tty_get_baud_rate(port->tty);
+
+ /* If the baud rate is to be updated*/
+ if (baud != tty_termios_baud_rate(old_termios)) {
+ switch (baud) {
+ case 0:
+ case 600:
+ case 1200:
+ case 1800:
+ case 2400:
+ case 4800:
+ case 7200:
+ case 9600:
+ case 14400:
+ case 19200:
+ case 28800:
+ case 38400:
+ case 55854:
+ case 57600:
+ case 115200:
+ case 127117:
+ case 230400:
+ case 460800:
+ case 921600:
+ case 3686400:
+ break;
+ default:
+ baud = 9600;
+ break;
+ }
+
+ if (baud) {
+ dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
+ baud);
+ if (cp2101_set_config_single(port, CP2101_BAUDRATE,
+ (BAUD_RATE_GEN_FREQ / baud))) {
+ dev_err(&port->dev, "Baud rate requested not "
+ "supported by device\n");
+ baud = tty_termios_baud_rate(old_termios);
+ }
+ }
+ }
+ /* Report back the resulting baud rate */
+ tty_encode_baud_rate(port->tty, baud, baud);
+
+ /* If the number of data bits is to be updated */
+ if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+ cp2101_get_config(port, CP2101_BITS, &bits, 2);
+ bits &= ~BITS_DATA_MASK;
+ switch (cflag & CSIZE) {
+ case CS5:
+ bits |= BITS_DATA_5;
+ dbg("%s - data bits = 5", __FUNCTION__);
+ break;
+ case CS6:
+ bits |= BITS_DATA_6;
+ dbg("%s - data bits = 6", __FUNCTION__);
+ break;
+ case CS7:
+ bits |= BITS_DATA_7;
+ dbg("%s - data bits = 7", __FUNCTION__);
+ break;
+ case CS8:
+ bits |= BITS_DATA_8;
+ dbg("%s - data bits = 8", __FUNCTION__);
+ break;
+ /*case CS9:
+ bits |= BITS_DATA_9;
+ dbg("%s - data bits = 9", __FUNCTION__);
+ break;*/
+ default:
+ dev_err(&port->dev, "cp2101 driver does not "
+ "support the number of bits requested,"
+ " using 8 bit mode\n");
+ bits |= BITS_DATA_8;
+ break;
+ }
+ if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
+ dev_err(&port->dev, "Number of data bits requested "
+ "not supported by device\n");
+ }
+
+ if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
+ cp2101_get_config(port, CP2101_BITS, &bits, 2);
+ bits &= ~BITS_PARITY_MASK;
+ if (cflag & PARENB) {
+ if (cflag & PARODD) {
+ bits |= BITS_PARITY_ODD;
+ dbg("%s - parity = ODD", __FUNCTION__);
+ } else {
+ bits |= BITS_PARITY_EVEN;
+ dbg("%s - parity = EVEN", __FUNCTION__);
+ }
+ }
+ if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
+ dev_err(&port->dev, "Parity mode not supported "
+ "by device\n");
+ }
+
+ if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
+ cp2101_get_config(port, CP2101_BITS, &bits, 2);
+ bits &= ~BITS_STOP_MASK;
+ if (cflag & CSTOPB) {
+ bits |= BITS_STOP_2;
+ dbg("%s - stop bits = 2", __FUNCTION__);
+ } else {
+ bits |= BITS_STOP_1;
+ dbg("%s - stop bits = 1", __FUNCTION__);
+ }
+ if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
+ dev_err(&port->dev, "Number of stop bits requested "
+ "not supported by device\n");
+ }
+
+ if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
+ cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
+ dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
+ __FUNCTION__, modem_ctl[0], modem_ctl[1],
+ modem_ctl[2], modem_ctl[3]);
+
+ if (cflag & CRTSCTS) {
+ modem_ctl[0] &= ~0x7B;
+ modem_ctl[0] |= 0x09;
+ modem_ctl[1] = 0x80;
+ dbg("%s - flow control = CRTSCTS", __FUNCTION__);
+ } else {
+ modem_ctl[0] &= ~0x7B;
+ modem_ctl[0] |= 0x01;
+ modem_ctl[1] |= 0x40;
+ dbg("%s - flow control = NONE", __FUNCTION__);
+ }
+
+ dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
+ __FUNCTION__, modem_ctl[0], modem_ctl[1],
+ modem_ctl[2], modem_ctl[3]);
+ cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
+ }
+
+}
+
+static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ int control = 0;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (set & TIOCM_RTS) {
+ control |= CONTROL_RTS;
+ control |= CONTROL_WRITE_RTS;
+ }
+ if (set & TIOCM_DTR) {
+ control |= CONTROL_DTR;
+ control |= CONTROL_WRITE_DTR;
+ }
+ if (clear & TIOCM_RTS) {
+ control &= ~CONTROL_RTS;
+ control |= CONTROL_WRITE_RTS;
+ }
+ if (clear & TIOCM_DTR) {
+ control &= ~CONTROL_DTR;
+ control |= CONTROL_WRITE_DTR;
+ }
+
+ dbg("%s - control = 0x%.4x", __FUNCTION__, control);
+
+ return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
+
+}
+
+static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
+{
+ int control, result;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ cp2101_get_config(port, CP2101_CONTROL, &control, 1);
+
+ result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
+ |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
+ |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
+ |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
+ |((control & CONTROL_RING)? TIOCM_RI : 0)
+ |((control & CONTROL_DCD) ? TIOCM_CD : 0);
+
+ dbg("%s - control = 0x%.2x", __FUNCTION__, control);
+
+ return result;
+}
+
+static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
+{
+ int state;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+ if (break_state == 0)
+ state = BREAK_OFF;
+ else
+ state = BREAK_ON;
+ dbg("%s - turning break %s", __FUNCTION__,
+ state==BREAK_OFF ? "off" : "on");
+ cp2101_set_config(port, CP2101_BREAK, &state, 2);
+}
+
+static int cp2101_startup (struct usb_serial *serial)
+{
+ /* CP2101 buffers behave strangely unless device is reset */
+ usb_reset_device(serial->dev);
+ return 0;
+}
+
+static void cp2101_shutdown (struct usb_serial *serial)
+{
+ int i;
+
+ dbg("%s", __FUNCTION__);
+
+ /* Stop reads and writes on all ports */
+ for (i=0; i < serial->num_ports; ++i) {
+ cp2101_cleanup(serial->port[i]);
+ }
+}
+
+static int __init cp2101_init (void)
+{
+ int retval;
+
+ retval = usb_serial_register(&cp2101_device);
+ if (retval)
+ return retval; /* Failed to register */
+
+ retval = usb_register(&cp2101_driver);
+ if (retval) {
+ /* Failed to register */
+ usb_serial_deregister(&cp2101_device);
+ return retval;
+ }
+
+ /* Success */
+ info(DRIVER_DESC " " DRIVER_VERSION);
+ return 0;
+}
+
+static void __exit cp2101_exit (void)
+{
+ usb_deregister (&cp2101_driver);
+ usb_serial_deregister (&cp2101_device);
+}
+
+module_init(cp2101_init);
+module_exit(cp2101_exit);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
--
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