static int ch341_set_baudrate(struct usb_device *dev,
struct ch341_private *priv)
{
short a, b;
int r;
unsigned long factor;
short divisor;
if (!priv->baud_rate)
return -EINVAL;
factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
divisor = CH341_BAUDBASE_DIVMAX;
while ((factor > 0xfff0) && divisor) {
factor >>= 3;
divisor--;
}
if (factor > 0xfff0)
return -EINVAL;
factor = 0x10000 - factor;
a = (factor & 0xff00) | divisor;
b = factor & 0xff;
r = ch341_control_out(dev, 0x9a, 0x1312, a);
if (!r)
r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
return r;
}
static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
{
char *buffer;
int r;
const unsigned size = 8;
dbg("ch341_configure()");
buffer = kmalloc(size, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
/* expect two bytes 0x27 0x00 */
r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size);
if (r < 0)
goto out;
r = ch341_control_out(dev, 0xa1, 0, 0);
if (r < 0)
goto out;
r = ch341_set_baudrate(dev, priv);
if (r < 0)
goto out;
/* expect two bytes 0x56 0x00 */
r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size);
if (r < 0)
goto out;
r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050);
if (r < 0)
goto out;
/* expect 0xff 0xee */
r = ch341_get_status(dev, priv);
if (r < 0)
goto out;
r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a);
if (r < 0)
goto out;
r = ch341_set_baudrate(dev, priv);
if (r < 0)
goto out;
r = ch341_set_handshake(dev, priv->line_control);
if (r < 0)
goto out;
/* expect 0x9f 0xee */
r = ch341_get_status(dev, priv);
out:
kfree(buffer);
return r;
}
static int ch341_set_handshake(struct usb_device *dev,
struct ch341_private *priv)
{
dbg("ch341_set_handshake(%d,%d)", priv->dtr, priv->rts);
return ch341_control_out(dev, 0xa4,
~((priv->dtr?1<<5:0)|(priv->rts?1<<6:0)), 0);
}
static int ch341_set_baudrate(struct usb_device *dev,
struct ch341_private *priv)
{
short a, b;
int r;
dbg("ch341_set_baudrate(%d)", priv->baud_rate);
switch (priv->baud_rate) {
case 2400:
a = 0xd901;
b = 0x0038;
break;
case 4800:
a = 0x6402;
b = 0x001f;
break;
case 9600:
a = 0xb202;
b = 0x0013;
break;
case 19200:
a = 0xd902;
b = 0x000d;
break;
case 38400:
a = 0x6403;
b = 0x000a;
break;
case 115200:
a = 0xcc03;
b = 0x0008;
break;
default:
return -EINVAL;
}
r = ch341_control_out(dev, 0x9a, 0x1312, a);
if (!r)
r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
return r;
}
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
{
const uint16_t ch341_break_reg =
CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8);
struct usb_serial_port *port = tty->driver_data;
int r;
uint16_t reg_contents;
uint8_t *break_reg;
dbg("%s()", __func__);
break_reg = kmalloc(2, GFP_KERNEL);
if (!break_reg) {
dev_err(&port->dev, "%s - kmalloc failed\n", __func__);
return;
}
r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
ch341_break_reg, 0, break_reg, 2);
if (r < 0) {
dev_err(&port->dev, "%s - USB control read error (%d)\n",
__func__, r);
goto out;
}
dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x",
__func__, break_reg[0], break_reg[1]);
if (break_state != 0) {
dbg("%s - Enter break state requested", __func__);
break_reg[0] &= ~CH341_NBREAK_BITS_REG1;
break_reg[1] &= ~CH341_NBREAK_BITS_REG2;
} else {
dbg("%s - Leave break state requested", __func__);
break_reg[0] |= CH341_NBREAK_BITS_REG1;
break_reg[1] |= CH341_NBREAK_BITS_REG2;
}
dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x",
__func__, break_reg[0], break_reg[1]);
reg_contents = get_unaligned_le16(break_reg);
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
ch341_break_reg, reg_contents);
if (r < 0)
dev_err(&port->dev, "%s - USB control write error (%d)\n",
__func__, r);
out:
kfree(break_reg);
}
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
{
const uint16_t ch341_break_reg =
CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8);
struct usb_serial_port *port = tty->driver_data;
int r;
uint16_t reg_contents;
uint8_t break_reg[2];
dbg("%s()", __func__);
r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
ch341_break_reg, 0, break_reg, sizeof(break_reg));
if (r < 0) {
printk(KERN_WARNING "%s: USB control read error whilst getting"
" break register contents.\n", __FILE__);
return;
}
dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x",
__func__, break_reg[0], break_reg[1]);
if (break_state != 0) {
dbg("%s - Enter break state requested", __func__);
break_reg[0] &= ~CH341_NBREAK_BITS_REG1;
break_reg[1] &= ~CH341_NBREAK_BITS_REG2;
} else {
dbg("%s - Leave break state requested", __func__);
break_reg[0] |= CH341_NBREAK_BITS_REG1;
break_reg[1] |= CH341_NBREAK_BITS_REG2;
}
dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x",
__func__, break_reg[0], break_reg[1]);
reg_contents = (uint16_t)break_reg[0] | ((uint16_t)break_reg[1] << 8);
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
ch341_break_reg, reg_contents);
if (r < 0)
printk(KERN_WARNING "%s: USB control write error whilst setting"
" break register contents.\n", __FILE__);
}
static int ch341_set_handshake(struct usb_device *dev, u8 control)
{
return ch341_control_out(dev, 0xa4, ~control, 0);
}
static int ch341_set_handshake(struct usb_device *dev, u8 control)
{
dbg("ch341_set_handshake(0x%02x)", control);
return ch341_control_out(dev, 0xa4, ~control, 0);
}
