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_get_status(struct usb_device *dev) { char *buffer; int r; const unsigned size = 8; dbg("ch341_get_status()"); buffer = kmalloc(size, GFP_KERNEL); if (!buffer) return -ENOMEM; r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); if (r < 0) goto out; /* Not having the datasheet for the CH341, we ignore the bytes returned * from the device. Return error if the device did not respond in time. */ r = 0; out: kfree(buffer); return r; }