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Subject[PATCH] usb: cp210x: Added support for GPIO (CP2103/4/5)
Date
This fix contains several changes that allow toggling of GPIO on CP210x
devices that support it. Changes include:
* Added in part number support, necessary to see if the connected device
supports the GPIO functionality
* Added two IOCTLs and ioctl function to allow GET/SET of GPIO
* Added in new #defines for partnum support, new USB requests
* Changed "Config request types" section to contain more correct definitions
for request recipient

Signed-off-by: Preston Fick <preston.fick@silabs.com>
---
drivers/usb/serial/cp210x.c | 134 +++++++++++++++++++++++++++++++++++++++++--
1 files changed, 129 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ec30f95..9d1e542 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -35,6 +35,8 @@
*/
static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *);
static void cp210x_close(struct usb_serial_port *);
+static int cp210x_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg);
static void cp210x_get_termios(struct tty_struct *,
struct usb_serial_port *port);
static void cp210x_get_termios_port(struct usb_serial_port *port,
@@ -154,6 +156,7 @@ MODULE_DEVICE_TABLE(usb, id_table);

struct cp210x_port_private {
__u8 bInterfaceNumber;
+ __u8 bPartNumber;
};

static struct usb_driver cp210x_driver = {
@@ -174,6 +177,7 @@ static struct usb_serial_driver cp210x_device = {
.bulk_out_size = 256,
.open = cp210x_open,
.close = cp210x_close,
+ .ioctl = cp210x_ioctl,
.break_ctl = cp210x_break_ctl,
.set_termios = cp210x_set_termios,
.tiocmget = cp210x_tiocmget,
@@ -187,9 +191,22 @@ static struct usb_serial_driver * const serial_drivers[] = {
&cp210x_device, NULL
};

+/* Part number definitions */
+#define CP2101_PARTNUM 0x01
+#define CP2102_PARTNUM 0x02
+#define CP2103_PARTNUM 0x03
+#define CP2104_PARTNUM 0x04
+#define CP2105_PARTNUM 0x05
+
+/* IOCTLs */
+#define IOCTL_GPIOGET 0x8000
+#define IOCTL_GPIOSET 0x8001
+
/* Config request types */
-#define REQTYPE_HOST_TO_DEVICE 0x41
-#define REQTYPE_DEVICE_TO_HOST 0xc1
+#define REQTYPE_HOST_TO_INTERFACE 0x41
+#define REQTYPE_INTERFACE_TO_HOST 0xc1
+#define REQTYPE_HOST_TO_DEVICE 0x40
+#define REQTYPE_DEVICE_TO_HOST 0xc0

/* Config request codes */
#define CP210X_IFC_ENABLE 0x00
@@ -218,11 +235,17 @@ static struct usb_serial_driver * const serial_drivers[] = {
#define CP210X_SET_CHARS 0x19
#define CP210X_GET_BAUDRATE 0x1D
#define CP210X_SET_BAUDRATE 0x1E
+#define CP210X_VENDOR_SPECIFIC 0xFF

/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000

+/* CP210X_VENDOR_SPECIFIC */
+#define CP210X_WRITE_LATCH 0x37E1
+#define CP210X_READ_LATCH 0x00C2
+#define CP210X_GET_PARTNUM 0x370B
+
/* CP210X_(SET|GET)_BAUDDIV */
#define BAUD_RATE_GEN_FREQ 0x384000

@@ -286,7 +309,7 @@ static int cp210x_get_config(struct usb_serial_port *port, u8 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,
+ request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
port_priv->bInterfaceNumber, buf, size,
USB_CTRL_GET_TIMEOUT);

@@ -340,13 +363,13 @@ static int cp210x_set_config(struct usb_serial_port *port, u8 request,
if (size > 2) {
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
- request, REQTYPE_HOST_TO_DEVICE, 0x0000,
+ request, REQTYPE_HOST_TO_INTERFACE, 0x0000,
port_priv->bInterfaceNumber, buf, size,
USB_CTRL_SET_TIMEOUT);
} else {
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
- request, REQTYPE_HOST_TO_DEVICE, data[0],
+ request, REQTYPE_HOST_TO_INTERFACE, data[0],
port_priv->bInterfaceNumber, NULL, 0,
USB_CTRL_SET_TIMEOUT);
}
@@ -453,6 +476,95 @@ static void cp210x_close(struct usb_serial_port *port)
mutex_unlock(&port->serial->disc_mutex);
}

+static int cp210x_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
+ int result = 0;
+ unsigned int latch_setting = 0;
+
+ switch (cmd) {
+
+ case IOCTL_GPIOGET:
+ if ((port_priv->bPartNumber == CP2103_PARTNUM) ||
+ (port_priv->bPartNumber == CP2104_PARTNUM)) {
+ result = usb_control_msg(port->serial->dev,
+ usb_rcvctrlpipe(port->serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_DEVICE_TO_HOST,
+ CP210X_READ_LATCH,
+ port_priv->bInterfaceNumber,
+ &latch_setting, 1,
+ USB_CTRL_GET_TIMEOUT);
+ if (result != 1)
+ return -EPROTO;
+ *(unsigned long *)arg = (unsigned long)latch_setting;
+ return 0;
+ } else if (port_priv->bPartNumber == CP2105_PARTNUM) {
+ result = usb_control_msg(port->serial->dev,
+ usb_rcvctrlpipe(port->serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_INTERFACE_TO_HOST,
+ CP210X_READ_LATCH,
+ port_priv->bInterfaceNumber,
+ &latch_setting, 1,
+ USB_CTRL_GET_TIMEOUT);
+ if (result != 1)
+ return -EPROTO;
+ *(unsigned long *)arg = (unsigned long)latch_setting;
+ return 0;
+ } else {
+ return -ENOTSUPP;
+ }
+ break;
+
+ case IOCTL_GPIOSET:
+ if ((port_priv->bPartNumber == CP2103_PARTNUM) ||
+ (port_priv->bPartNumber == CP2104_PARTNUM)) {
+ latch_setting =
+ *(unsigned int *)arg & 0x000000FF;
+ latch_setting |=
+ (*(unsigned int *)arg & 0x00FF0000) >> 8;
+ result = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_HOST_TO_DEVICE,
+ CP210X_WRITE_LATCH,
+ latch_setting,
+ NULL, 0,
+ USB_CTRL_SET_TIMEOUT);
+ if (result != 0)
+ return -EPROTO;
+ return 0;
+ } else if (port_priv->bPartNumber == CP2105_PARTNUM) {
+ latch_setting =
+ *(unsigned int *)arg & 0x000000FF;
+ latch_setting |=
+ (*(unsigned int *)arg & 0x00FF0000) >> 8;
+ result = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_HOST_TO_INTERFACE,
+ CP210X_WRITE_LATCH,
+ port_priv->bInterfaceNumber,
+ &latch_setting, 2,
+ USB_CTRL_SET_TIMEOUT);
+ if (result != 2)
+ return -EPROTO;
+ return 0;
+ } else {
+ return -ENOTSUPP;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return -ENOIOCTLCMD;
+}
+
/*
* cp210x_get_termios
* Reads the baud rate, data bits, parity, stop bits and flow control mode
@@ -860,6 +972,7 @@ static int cp210x_startup(struct usb_serial *serial)
{
struct cp210x_port_private *port_priv;
int i;
+ unsigned int partNum;

/* cp210x buffers behave strangely unless device is reset */
usb_reset_device(serial->dev);
@@ -874,6 +987,17 @@ static int cp210x_startup(struct usb_serial *serial)
serial->interface->cur_altsetting->desc.bInterfaceNumber;

usb_set_serial_port_data(serial->port[i], port_priv);
+
+ /* Get the 1-byte part number of the cp210x device */
+ usb_control_msg(serial->dev,
+ usb_rcvctrlpipe(serial->dev, 0),
+ CP210X_VENDOR_SPECIFIC,
+ REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_PARTNUM,
+ port_priv->bInterfaceNumber,
+ &partNum, 1,
+ USB_CTRL_GET_TIMEOUT);
+ port_priv->bPartNumber = partNum & 0xFF;
}

return 0;
--
1.7.5.4


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