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USB: serial: cp210x: add new access functions for large registers 

cp210x_get_config and cp210x_set_config are cumbersome to use. This change
switches large register access to use new block functions. The old
functions are removed because now they become unused.

Signed-off-by: Konstantin Shkolnyy <konstantin.shkolnyy@gmail.com>
[johan: minor style change ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Konstantin Shkolnyy 2016-02-28 15:51:56 -06:00 committed by Johan Hovold
parent fe1b07e99c
commit 7084fa868b
1 changed files with 24 additions and 113 deletions
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137
drivers/usb/serial/cp210x.c
View File

@ -323,105 +323,6 @@ struct cp210x_comm_status {
*/
#define PURGE_ALL 0x000f
/*
* cp210x_get_config
* Reads from the CP210x 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 cp210x_get_config(struct usb_serial_port *port, u8 request,
unsigned int *data, int size)
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
__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)
return -ENOMEM;
/* Issue the request, attempting to read 'size' bytes */
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
request, REQTYPE_INTERFACE_TO_HOST, 0x0000,
port_priv->bInterfaceNumber, buf, size,
USB_CTRL_GET_TIMEOUT);
/* 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_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n",
__func__, request, size, result);
if (result > 0)
result = -EPROTO;
return result;
}
return 0;
}
/*
* cp210x_set_config
* Writes to the CP210x configuration registers
* Values less than 16 bits wide are sent directly
* 'size' is specified in bytes.
*/
static int cp210x_set_config(struct usb_serial_port *port, u8 request,
unsigned int *data, int size)
{
struct usb_serial *serial = port->serial;
struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
__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)
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_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_INTERFACE, data[0],
port_priv->bInterfaceNumber, NULL, 0,
USB_CTRL_SET_TIMEOUT);
}
kfree(buf);
if ((size > 2 && result != size) || result < 0) {
dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n",
__func__, request, size, result);
if (result > 0)
result = -EPROTO;
return result;
}
return 0;
}
/*
* Reads a variable-sized block of CP210X_ registers, identified by req.
* Returns data into buf in native USB byte order.
@ -788,7 +689,8 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
unsigned int *cflagp, unsigned int *baudp)
{
struct device *dev = &port->dev;
unsigned int cflag, modem_ctl[4];
unsigned int cflag;
u8 modem_ctl[16];
u32 baud;
u16 bits;
@ -886,8 +788,9 @@ static void cp210x_get_termios_port(struct usb_serial_port *port,
break;
}
cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
if (modem_ctl[0] & 0x0008) {
cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
sizeof(modem_ctl));
if (modem_ctl[0] & 0x08) {
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
cflag |= CRTSCTS;
} else {
@ -956,7 +859,7 @@ static void cp210x_set_termios(struct tty_struct *tty,
struct device *dev = &port->dev;
unsigned int cflag, old_cflag;
u16 bits;
unsigned int modem_ctl[4];
u8 modem_ctl[16];
cflag = tty->termios.c_cflag;
old_cflag = old_termios->c_cflag;
@ -1040,27 +943,35 @@ static void cp210x_set_termios(struct tty_struct *tty,
}
if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
__func__, modem_ctl[0], modem_ctl[1],
modem_ctl[2], modem_ctl[3]);
/* Only bytes 0, 4 and 7 out of first 8 have functional bits */
cp210x_read_reg_block(port, CP210X_GET_FLOW, modem_ctl,
sizeof(modem_ctl));
dev_dbg(dev, "%s - read modem controls = %02x .. .. .. %02x .. .. %02x\n",
__func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
if (cflag & CRTSCTS) {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x09;
modem_ctl[1] = 0x80;
modem_ctl[4] = 0x80;
/* FIXME - why clear reserved bits just read? */
modem_ctl[5] = 0;
modem_ctl[6] = 0;
modem_ctl[7] = 0;
dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__);
} else {
modem_ctl[0] &= ~0x7B;
modem_ctl[0] |= 0x01;
modem_ctl[1] |= 0x40;
/* FIXME - OR here instead of assignment looks wrong */
modem_ctl[4] |= 0x40;
dev_dbg(dev, "%s - flow control = NONE\n", __func__);
}
dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n",
__func__, modem_ctl[0], modem_ctl[1],
modem_ctl[2], modem_ctl[3]);
cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
dev_dbg(dev, "%s - write modem controls = %02x .. .. .. %02x .. .. %02x\n",
__func__, modem_ctl[0], modem_ctl[4], modem_ctl[7]);
cp210x_write_reg_block(port, CP210X_SET_FLOW, modem_ctl,
sizeof(modem_ctl));
}
}