16ce76104SFrank A Kingswood /* 26ce76104SFrank A Kingswood * Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk> 3664d5df9SWerner Cornelius * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de> 4664d5df9SWerner Cornelius * Copyright 2009, Boris Hajduk <boris@hajduk.org> 56ce76104SFrank A Kingswood * 66ce76104SFrank A Kingswood * ch341.c implements a serial port driver for the Winchiphead CH341. 76ce76104SFrank A Kingswood * 86ce76104SFrank A Kingswood * The CH341 device can be used to implement an RS232 asynchronous 96ce76104SFrank A Kingswood * serial port, an IEEE-1284 parallel printer port or a memory-like 106ce76104SFrank A Kingswood * interface. In all cases the CH341 supports an I2C interface as well. 116ce76104SFrank A Kingswood * This driver only supports the asynchronous serial interface. 126ce76104SFrank A Kingswood * 136ce76104SFrank A Kingswood * This program is free software; you can redistribute it and/or 146ce76104SFrank A Kingswood * modify it under the terms of the GNU General Public License version 156ce76104SFrank A Kingswood * 2 as published by the Free Software Foundation. 166ce76104SFrank A Kingswood */ 176ce76104SFrank A Kingswood 186ce76104SFrank A Kingswood #include <linux/kernel.h> 196ce76104SFrank A Kingswood #include <linux/tty.h> 206ce76104SFrank A Kingswood #include <linux/module.h> 215a0e3ad6STejun Heo #include <linux/slab.h> 226ce76104SFrank A Kingswood #include <linux/usb.h> 236ce76104SFrank A Kingswood #include <linux/usb/serial.h> 246ce76104SFrank A Kingswood #include <linux/serial.h> 255be796f0SJohan Hovold #include <asm/unaligned.h> 266ce76104SFrank A Kingswood 27664d5df9SWerner Cornelius #define DEFAULT_BAUD_RATE 9600 286ce76104SFrank A Kingswood #define DEFAULT_TIMEOUT 1000 296ce76104SFrank A Kingswood 30664d5df9SWerner Cornelius /* flags for IO-Bits */ 31664d5df9SWerner Cornelius #define CH341_BIT_RTS (1 << 6) 32664d5df9SWerner Cornelius #define CH341_BIT_DTR (1 << 5) 33664d5df9SWerner Cornelius 34664d5df9SWerner Cornelius /******************************/ 35664d5df9SWerner Cornelius /* interrupt pipe definitions */ 36664d5df9SWerner Cornelius /******************************/ 37664d5df9SWerner Cornelius /* always 4 interrupt bytes */ 38664d5df9SWerner Cornelius /* first irq byte normally 0x08 */ 39664d5df9SWerner Cornelius /* second irq byte base 0x7d + below */ 40664d5df9SWerner Cornelius /* third irq byte base 0x94 + below */ 41664d5df9SWerner Cornelius /* fourth irq byte normally 0xee */ 42664d5df9SWerner Cornelius 43664d5df9SWerner Cornelius /* second interrupt byte */ 44664d5df9SWerner Cornelius #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ 45664d5df9SWerner Cornelius 46664d5df9SWerner Cornelius /* status returned in third interrupt answer byte, inverted in data 47664d5df9SWerner Cornelius from irq */ 48664d5df9SWerner Cornelius #define CH341_BIT_CTS 0x01 49664d5df9SWerner Cornelius #define CH341_BIT_DSR 0x02 50664d5df9SWerner Cornelius #define CH341_BIT_RI 0x04 51664d5df9SWerner Cornelius #define CH341_BIT_DCD 0x08 52664d5df9SWerner Cornelius #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ 53664d5df9SWerner Cornelius 54664d5df9SWerner Cornelius /*******************************/ 55664d5df9SWerner Cornelius /* baudrate calculation factor */ 56664d5df9SWerner Cornelius /*******************************/ 57664d5df9SWerner Cornelius #define CH341_BAUDBASE_FACTOR 1532620800 58664d5df9SWerner Cornelius #define CH341_BAUDBASE_DIVMAX 3 59664d5df9SWerner Cornelius 60492896f0STim Small /* Break support - the information used to implement this was gleaned from 61492896f0STim Small * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. 62492896f0STim Small */ 63492896f0STim Small 646fde8d29SAidan Thornton #define CH341_REQ_READ_VERSION 0x5F 65492896f0STim Small #define CH341_REQ_WRITE_REG 0x9A 66492896f0STim Small #define CH341_REQ_READ_REG 0x95 676fde8d29SAidan Thornton #define CH341_REQ_SERIAL_INIT 0xA1 686fde8d29SAidan Thornton #define CH341_REQ_MODEM_CTRL 0xA4 69492896f0STim Small 706fde8d29SAidan Thornton #define CH341_REG_BREAK 0x05 716fde8d29SAidan Thornton #define CH341_REG_LCR 0x18 726fde8d29SAidan Thornton #define CH341_NBREAK_BITS 0x01 736fde8d29SAidan Thornton 746fde8d29SAidan Thornton #define CH341_LCR_ENABLE_RX 0x80 756fde8d29SAidan Thornton #define CH341_LCR_ENABLE_TX 0x40 766fde8d29SAidan Thornton #define CH341_LCR_MARK_SPACE 0x20 776fde8d29SAidan Thornton #define CH341_LCR_PAR_EVEN 0x10 786fde8d29SAidan Thornton #define CH341_LCR_ENABLE_PAR 0x08 796fde8d29SAidan Thornton #define CH341_LCR_STOP_BITS_2 0x04 806fde8d29SAidan Thornton #define CH341_LCR_CS8 0x03 816fde8d29SAidan Thornton #define CH341_LCR_CS7 0x02 826fde8d29SAidan Thornton #define CH341_LCR_CS6 0x01 836fde8d29SAidan Thornton #define CH341_LCR_CS5 0x00 84492896f0STim Small 857d40d7e8SNémeth Márton static const struct usb_device_id id_table[] = { 866ce76104SFrank A Kingswood { USB_DEVICE(0x4348, 0x5523) }, 8782078234SMichael F. Robbins { USB_DEVICE(0x1a86, 0x7523) }, 88d0781383Swangyanqing { USB_DEVICE(0x1a86, 0x5523) }, 896ce76104SFrank A Kingswood { }, 906ce76104SFrank A Kingswood }; 916ce76104SFrank A Kingswood MODULE_DEVICE_TABLE(usb, id_table); 926ce76104SFrank A Kingswood 936ce76104SFrank A Kingswood struct ch341_private { 94664d5df9SWerner Cornelius spinlock_t lock; /* access lock */ 95664d5df9SWerner Cornelius unsigned baud_rate; /* set baud rate */ 96664d5df9SWerner Cornelius u8 line_control; /* set line control value RTS/DTR */ 97664d5df9SWerner Cornelius u8 line_status; /* active status of modem control inputs */ 986ce76104SFrank A Kingswood }; 996ce76104SFrank A Kingswood 100aa91def4SNicolas PLANEL static void ch341_set_termios(struct tty_struct *tty, 101aa91def4SNicolas PLANEL struct usb_serial_port *port, 102aa91def4SNicolas PLANEL struct ktermios *old_termios); 103aa91def4SNicolas PLANEL 1046ce76104SFrank A Kingswood static int ch341_control_out(struct usb_device *dev, u8 request, 1056ce76104SFrank A Kingswood u16 value, u16 index) 1066ce76104SFrank A Kingswood { 1076ce76104SFrank A Kingswood int r; 10879cbeeafSGreg Kroah-Hartman 10979cbeeafSGreg Kroah-Hartman dev_dbg(&dev->dev, "ch341_control_out(%02x,%02x,%04x,%04x)\n", 11079cbeeafSGreg Kroah-Hartman USB_DIR_OUT|0x40, (int)request, (int)value, (int)index); 1116ce76104SFrank A Kingswood 1126ce76104SFrank A Kingswood r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, 1136ce76104SFrank A Kingswood USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, 1146ce76104SFrank A Kingswood value, index, NULL, 0, DEFAULT_TIMEOUT); 1156ce76104SFrank A Kingswood 1166ce76104SFrank A Kingswood return r; 1176ce76104SFrank A Kingswood } 1186ce76104SFrank A Kingswood 1196ce76104SFrank A Kingswood static int ch341_control_in(struct usb_device *dev, 1206ce76104SFrank A Kingswood u8 request, u16 value, u16 index, 1216ce76104SFrank A Kingswood char *buf, unsigned bufsize) 1226ce76104SFrank A Kingswood { 1236ce76104SFrank A Kingswood int r; 12479cbeeafSGreg Kroah-Hartman 12579cbeeafSGreg Kroah-Hartman dev_dbg(&dev->dev, "ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)\n", 12679cbeeafSGreg Kroah-Hartman USB_DIR_IN|0x40, (int)request, (int)value, (int)index, buf, 12779cbeeafSGreg Kroah-Hartman (int)bufsize); 1286ce76104SFrank A Kingswood 1296ce76104SFrank A Kingswood r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, 1306ce76104SFrank A Kingswood USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, 1316ce76104SFrank A Kingswood value, index, buf, bufsize, DEFAULT_TIMEOUT); 1326ce76104SFrank A Kingswood return r; 1336ce76104SFrank A Kingswood } 1346ce76104SFrank A Kingswood 1354e46c410SAidan Thornton static int ch341_init_set_baudrate(struct usb_device *dev, 1364e46c410SAidan Thornton struct ch341_private *priv, unsigned ctrl) 1376ce76104SFrank A Kingswood { 1384e46c410SAidan Thornton short a; 1396ce76104SFrank A Kingswood int r; 140664d5df9SWerner Cornelius unsigned long factor; 141664d5df9SWerner Cornelius short divisor; 1426ce76104SFrank A Kingswood 143664d5df9SWerner Cornelius if (!priv->baud_rate) 1446ce76104SFrank A Kingswood return -EINVAL; 145664d5df9SWerner Cornelius factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); 146664d5df9SWerner Cornelius divisor = CH341_BAUDBASE_DIVMAX; 147664d5df9SWerner Cornelius 148664d5df9SWerner Cornelius while ((factor > 0xfff0) && divisor) { 149664d5df9SWerner Cornelius factor >>= 3; 150664d5df9SWerner Cornelius divisor--; 1516ce76104SFrank A Kingswood } 1526ce76104SFrank A Kingswood 153664d5df9SWerner Cornelius if (factor > 0xfff0) 154664d5df9SWerner Cornelius return -EINVAL; 155664d5df9SWerner Cornelius 156664d5df9SWerner Cornelius factor = 0x10000 - factor; 157664d5df9SWerner Cornelius a = (factor & 0xff00) | divisor; 158664d5df9SWerner Cornelius 1594e46c410SAidan Thornton /* 0x9c is "enable SFR_UART Control register and timer" */ 1604e46c410SAidan Thornton r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 1614e46c410SAidan Thornton 0x9c | (ctrl << 8), a | 0x80); 1626ce76104SFrank A Kingswood 1636ce76104SFrank A Kingswood return r; 1646ce76104SFrank A Kingswood } 1656ce76104SFrank A Kingswood 166664d5df9SWerner Cornelius static int ch341_set_handshake(struct usb_device *dev, u8 control) 1676ce76104SFrank A Kingswood { 1686fde8d29SAidan Thornton return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0); 1696ce76104SFrank A Kingswood } 1706ce76104SFrank A Kingswood 171664d5df9SWerner Cornelius static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) 1726ce76104SFrank A Kingswood { 1736ce76104SFrank A Kingswood char *buffer; 1746ce76104SFrank A Kingswood int r; 1756ce76104SFrank A Kingswood const unsigned size = 8; 176664d5df9SWerner Cornelius unsigned long flags; 1776ce76104SFrank A Kingswood 1786ce76104SFrank A Kingswood buffer = kmalloc(size, GFP_KERNEL); 1796ce76104SFrank A Kingswood if (!buffer) 1806ce76104SFrank A Kingswood return -ENOMEM; 1816ce76104SFrank A Kingswood 1826fde8d29SAidan Thornton r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size); 1836ce76104SFrank A Kingswood if (r < 0) 1846ce76104SFrank A Kingswood goto out; 1856ce76104SFrank A Kingswood 186664d5df9SWerner Cornelius /* setup the private status if available */ 187664d5df9SWerner Cornelius if (r == 2) { 1886ce76104SFrank A Kingswood r = 0; 189664d5df9SWerner Cornelius spin_lock_irqsave(&priv->lock, flags); 190664d5df9SWerner Cornelius priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; 191664d5df9SWerner Cornelius spin_unlock_irqrestore(&priv->lock, flags); 192664d5df9SWerner Cornelius } else 193664d5df9SWerner Cornelius r = -EPROTO; 1946ce76104SFrank A Kingswood 1956ce76104SFrank A Kingswood out: kfree(buffer); 1966ce76104SFrank A Kingswood return r; 1976ce76104SFrank A Kingswood } 1986ce76104SFrank A Kingswood 1996ce76104SFrank A Kingswood /* -------------------------------------------------------------------------- */ 2006ce76104SFrank A Kingswood 20193b6497dSAdrian Bunk static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) 2026ce76104SFrank A Kingswood { 2036ce76104SFrank A Kingswood char *buffer; 2046ce76104SFrank A Kingswood int r; 2056ce76104SFrank A Kingswood const unsigned size = 8; 2066ce76104SFrank A Kingswood 2076ce76104SFrank A Kingswood buffer = kmalloc(size, GFP_KERNEL); 2086ce76104SFrank A Kingswood if (!buffer) 2096ce76104SFrank A Kingswood return -ENOMEM; 2106ce76104SFrank A Kingswood 2116ce76104SFrank A Kingswood /* expect two bytes 0x27 0x00 */ 2126fde8d29SAidan Thornton r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size); 2136ce76104SFrank A Kingswood if (r < 0) 2146ce76104SFrank A Kingswood goto out; 215a98b6900SAidan Thornton dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]); 2166ce76104SFrank A Kingswood 2176fde8d29SAidan Thornton r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0); 2186ce76104SFrank A Kingswood if (r < 0) 2196ce76104SFrank A Kingswood goto out; 2206ce76104SFrank A Kingswood 2216ce76104SFrank A Kingswood /* expect two bytes 0x56 0x00 */ 2226fde8d29SAidan Thornton r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x2518, 0, buffer, size); 2236ce76104SFrank A Kingswood if (r < 0) 2246ce76104SFrank A Kingswood goto out; 2256ce76104SFrank A Kingswood 2266fde8d29SAidan Thornton r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, 0x0050); 2276ce76104SFrank A Kingswood if (r < 0) 2286ce76104SFrank A Kingswood goto out; 2296ce76104SFrank A Kingswood 2306ce76104SFrank A Kingswood /* expect 0xff 0xee */ 231664d5df9SWerner Cornelius r = ch341_get_status(dev, priv); 2326ce76104SFrank A Kingswood if (r < 0) 2336ce76104SFrank A Kingswood goto out; 2346ce76104SFrank A Kingswood 2354e46c410SAidan Thornton r = ch341_init_set_baudrate(dev, priv, 0); 2366ce76104SFrank A Kingswood if (r < 0) 2376ce76104SFrank A Kingswood goto out; 2386ce76104SFrank A Kingswood 239664d5df9SWerner Cornelius r = ch341_set_handshake(dev, priv->line_control); 2406ce76104SFrank A Kingswood if (r < 0) 2416ce76104SFrank A Kingswood goto out; 2426ce76104SFrank A Kingswood 2436ce76104SFrank A Kingswood /* expect 0x9f 0xee */ 244664d5df9SWerner Cornelius r = ch341_get_status(dev, priv); 2456ce76104SFrank A Kingswood 2466ce76104SFrank A Kingswood out: kfree(buffer); 2476ce76104SFrank A Kingswood return r; 2486ce76104SFrank A Kingswood } 2496ce76104SFrank A Kingswood 250456c5be5SJohan Hovold static int ch341_port_probe(struct usb_serial_port *port) 2516ce76104SFrank A Kingswood { 2526ce76104SFrank A Kingswood struct ch341_private *priv; 2536ce76104SFrank A Kingswood int r; 2546ce76104SFrank A Kingswood 2556ce76104SFrank A Kingswood priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); 2566ce76104SFrank A Kingswood if (!priv) 2576ce76104SFrank A Kingswood return -ENOMEM; 2586ce76104SFrank A Kingswood 259664d5df9SWerner Cornelius spin_lock_init(&priv->lock); 2606ce76104SFrank A Kingswood priv->baud_rate = DEFAULT_BAUD_RATE; 2616ce76104SFrank A Kingswood 262456c5be5SJohan Hovold r = ch341_configure(port->serial->dev, priv); 2636ce76104SFrank A Kingswood if (r < 0) 2646ce76104SFrank A Kingswood goto error; 2656ce76104SFrank A Kingswood 266456c5be5SJohan Hovold usb_set_serial_port_data(port, priv); 2676ce76104SFrank A Kingswood return 0; 2686ce76104SFrank A Kingswood 2696ce76104SFrank A Kingswood error: kfree(priv); 2706ce76104SFrank A Kingswood return r; 2716ce76104SFrank A Kingswood } 2726ce76104SFrank A Kingswood 273456c5be5SJohan Hovold static int ch341_port_remove(struct usb_serial_port *port) 274456c5be5SJohan Hovold { 275456c5be5SJohan Hovold struct ch341_private *priv; 276456c5be5SJohan Hovold 277456c5be5SJohan Hovold priv = usb_get_serial_port_data(port); 278456c5be5SJohan Hovold kfree(priv); 279456c5be5SJohan Hovold 280456c5be5SJohan Hovold return 0; 281456c5be5SJohan Hovold } 282456c5be5SJohan Hovold 283335f8514SAlan Cox static int ch341_carrier_raised(struct usb_serial_port *port) 284335f8514SAlan Cox { 285335f8514SAlan Cox struct ch341_private *priv = usb_get_serial_port_data(port); 286335f8514SAlan Cox if (priv->line_status & CH341_BIT_DCD) 287335f8514SAlan Cox return 1; 288335f8514SAlan Cox return 0; 289335f8514SAlan Cox } 290335f8514SAlan Cox 291335f8514SAlan Cox static void ch341_dtr_rts(struct usb_serial_port *port, int on) 292664d5df9SWerner Cornelius { 293664d5df9SWerner Cornelius struct ch341_private *priv = usb_get_serial_port_data(port); 294664d5df9SWerner Cornelius unsigned long flags; 295664d5df9SWerner Cornelius 296335f8514SAlan Cox /* drop DTR and RTS */ 297335f8514SAlan Cox spin_lock_irqsave(&priv->lock, flags); 298335f8514SAlan Cox if (on) 299335f8514SAlan Cox priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; 300335f8514SAlan Cox else 301335f8514SAlan Cox priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); 302335f8514SAlan Cox spin_unlock_irqrestore(&priv->lock, flags); 303335f8514SAlan Cox ch341_set_handshake(port->serial->dev, priv->line_control); 304335f8514SAlan Cox } 305335f8514SAlan Cox 306335f8514SAlan Cox static void ch341_close(struct usb_serial_port *port) 307335f8514SAlan Cox { 308f26788daSJohan Hovold usb_serial_generic_close(port); 309664d5df9SWerner Cornelius usb_kill_urb(port->interrupt_in_urb); 310664d5df9SWerner Cornelius } 311664d5df9SWerner Cornelius 312664d5df9SWerner Cornelius 3136ce76104SFrank A Kingswood /* open this device, set default parameters */ 314a509a7e4SAlan Cox static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) 3156ce76104SFrank A Kingswood { 3166ce76104SFrank A Kingswood struct usb_serial *serial = port->serial; 317456c5be5SJohan Hovold struct ch341_private *priv = usb_get_serial_port_data(port); 3186ce76104SFrank A Kingswood int r; 3196ce76104SFrank A Kingswood 3206ce76104SFrank A Kingswood r = ch341_configure(serial->dev, priv); 3216ce76104SFrank A Kingswood if (r) 3226ce76104SFrank A Kingswood goto out; 3236ce76104SFrank A Kingswood 324aa91def4SNicolas PLANEL if (tty) 325aa91def4SNicolas PLANEL ch341_set_termios(tty, port, NULL); 3266ce76104SFrank A Kingswood 327d9a38a87SJohan Hovold dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__); 328664d5df9SWerner Cornelius r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 329664d5df9SWerner Cornelius if (r) { 330d9a38a87SJohan Hovold dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n", 331d9a38a87SJohan Hovold __func__, r); 33206946a66SJohan Hovold goto out; 333664d5df9SWerner Cornelius } 334664d5df9SWerner Cornelius 335a509a7e4SAlan Cox r = usb_serial_generic_open(tty, port); 3366ce76104SFrank A Kingswood 3376ce76104SFrank A Kingswood out: return r; 3386ce76104SFrank A Kingswood } 3396ce76104SFrank A Kingswood 3406ce76104SFrank A Kingswood /* Old_termios contains the original termios settings and 3416ce76104SFrank A Kingswood * tty->termios contains the new setting to be used. 3426ce76104SFrank A Kingswood */ 34395da310eSAlan Cox static void ch341_set_termios(struct tty_struct *tty, 34495da310eSAlan Cox struct usb_serial_port *port, struct ktermios *old_termios) 3456ce76104SFrank A Kingswood { 3466ce76104SFrank A Kingswood struct ch341_private *priv = usb_get_serial_port_data(port); 3476ce76104SFrank A Kingswood unsigned baud_rate; 348664d5df9SWerner Cornelius unsigned long flags; 3494e46c410SAidan Thornton unsigned char ctrl; 3504e46c410SAidan Thornton int r; 3514e46c410SAidan Thornton 3524e46c410SAidan Thornton /* redundant changes may cause the chip to lose bytes */ 3534e46c410SAidan Thornton if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 3544e46c410SAidan Thornton return; 3556ce76104SFrank A Kingswood 3566ce76104SFrank A Kingswood baud_rate = tty_get_baud_rate(tty); 3576ce76104SFrank A Kingswood 358ba781bdfSAidan Thornton ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX; 359664d5df9SWerner Cornelius 360ba781bdfSAidan Thornton switch (C_CSIZE(tty)) { 361ba781bdfSAidan Thornton case CS5: 362ba781bdfSAidan Thornton ctrl |= CH341_LCR_CS5; 363ba781bdfSAidan Thornton break; 364ba781bdfSAidan Thornton case CS6: 365ba781bdfSAidan Thornton ctrl |= CH341_LCR_CS6; 366ba781bdfSAidan Thornton break; 367ba781bdfSAidan Thornton case CS7: 368ba781bdfSAidan Thornton ctrl |= CH341_LCR_CS7; 369ba781bdfSAidan Thornton break; 370ba781bdfSAidan Thornton case CS8: 371ba781bdfSAidan Thornton ctrl |= CH341_LCR_CS8; 372ba781bdfSAidan Thornton break; 373ba781bdfSAidan Thornton } 374ba781bdfSAidan Thornton 375ba781bdfSAidan Thornton if (C_PARENB(tty)) { 376ba781bdfSAidan Thornton ctrl |= CH341_LCR_ENABLE_PAR; 377ba781bdfSAidan Thornton if (C_PARODD(tty) == 0) 378ba781bdfSAidan Thornton ctrl |= CH341_LCR_PAR_EVEN; 379ba781bdfSAidan Thornton if (C_CMSPAR(tty)) 380ba781bdfSAidan Thornton ctrl |= CH341_LCR_MARK_SPACE; 381ba781bdfSAidan Thornton } 382ba781bdfSAidan Thornton 383ba781bdfSAidan Thornton if (C_CSTOPB(tty)) 384ba781bdfSAidan Thornton ctrl |= CH341_LCR_STOP_BITS_2; 3854e46c410SAidan Thornton 386664d5df9SWerner Cornelius if (baud_rate) { 387a20047f3SJohan Hovold priv->baud_rate = baud_rate; 388a20047f3SJohan Hovold 3894e46c410SAidan Thornton r = ch341_init_set_baudrate(port->serial->dev, priv, ctrl); 3904e46c410SAidan Thornton if (r < 0 && old_termios) { 3914e46c410SAidan Thornton priv->baud_rate = tty_termios_baud_rate(old_termios); 3924e46c410SAidan Thornton tty_termios_copy_hw(&tty->termios, old_termios); 3934e46c410SAidan Thornton } 3946ce76104SFrank A Kingswood } 3956ce76104SFrank A Kingswood 396*030ee7aeSJohan Hovold spin_lock_irqsave(&priv->lock, flags); 397*030ee7aeSJohan Hovold if (C_BAUD(tty) == B0) 398*030ee7aeSJohan Hovold priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); 399*030ee7aeSJohan Hovold else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 400*030ee7aeSJohan Hovold priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); 401*030ee7aeSJohan Hovold spin_unlock_irqrestore(&priv->lock, flags); 4026ce76104SFrank A Kingswood 403*030ee7aeSJohan Hovold ch341_set_handshake(port->serial->dev, priv->line_control); 404664d5df9SWerner Cornelius } 40573f59308SAlan Cox 406492896f0STim Small static void ch341_break_ctl(struct tty_struct *tty, int break_state) 407492896f0STim Small { 408492896f0STim Small const uint16_t ch341_break_reg = 4096fde8d29SAidan Thornton ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK; 410492896f0STim Small struct usb_serial_port *port = tty->driver_data; 411492896f0STim Small int r; 412492896f0STim Small uint16_t reg_contents; 413f2b5cc83SJohan Hovold uint8_t *break_reg; 414492896f0STim Small 415f2b5cc83SJohan Hovold break_reg = kmalloc(2, GFP_KERNEL); 41610c642d0SJohan Hovold if (!break_reg) 417f2b5cc83SJohan Hovold return; 418f2b5cc83SJohan Hovold 419492896f0STim Small r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, 420f2b5cc83SJohan Hovold ch341_break_reg, 0, break_reg, 2); 421492896f0STim Small if (r < 0) { 4226a9b15feSJohan Hovold dev_err(&port->dev, "%s - USB control read error (%d)\n", 4236a9b15feSJohan Hovold __func__, r); 424f2b5cc83SJohan Hovold goto out; 425492896f0STim Small } 42679cbeeafSGreg Kroah-Hartman dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n", 427492896f0STim Small __func__, break_reg[0], break_reg[1]); 428492896f0STim Small if (break_state != 0) { 42979cbeeafSGreg Kroah-Hartman dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__); 4306fde8d29SAidan Thornton break_reg[0] &= ~CH341_NBREAK_BITS; 4316fde8d29SAidan Thornton break_reg[1] &= ~CH341_LCR_ENABLE_TX; 432492896f0STim Small } else { 43379cbeeafSGreg Kroah-Hartman dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__); 4346fde8d29SAidan Thornton break_reg[0] |= CH341_NBREAK_BITS; 4356fde8d29SAidan Thornton break_reg[1] |= CH341_LCR_ENABLE_TX; 436492896f0STim Small } 43779cbeeafSGreg Kroah-Hartman dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n", 438492896f0STim Small __func__, break_reg[0], break_reg[1]); 4395be796f0SJohan Hovold reg_contents = get_unaligned_le16(break_reg); 440492896f0STim Small r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, 441492896f0STim Small ch341_break_reg, reg_contents); 442492896f0STim Small if (r < 0) 4436a9b15feSJohan Hovold dev_err(&port->dev, "%s - USB control write error (%d)\n", 4446a9b15feSJohan Hovold __func__, r); 445f2b5cc83SJohan Hovold out: 446f2b5cc83SJohan Hovold kfree(break_reg); 447492896f0STim Small } 448492896f0STim Small 44920b9d177SAlan Cox static int ch341_tiocmset(struct tty_struct *tty, 450664d5df9SWerner Cornelius unsigned int set, unsigned int clear) 451664d5df9SWerner Cornelius { 452664d5df9SWerner Cornelius struct usb_serial_port *port = tty->driver_data; 453664d5df9SWerner Cornelius struct ch341_private *priv = usb_get_serial_port_data(port); 454664d5df9SWerner Cornelius unsigned long flags; 455664d5df9SWerner Cornelius u8 control; 456664d5df9SWerner Cornelius 457664d5df9SWerner Cornelius spin_lock_irqsave(&priv->lock, flags); 458664d5df9SWerner Cornelius if (set & TIOCM_RTS) 459664d5df9SWerner Cornelius priv->line_control |= CH341_BIT_RTS; 460664d5df9SWerner Cornelius if (set & TIOCM_DTR) 461664d5df9SWerner Cornelius priv->line_control |= CH341_BIT_DTR; 462664d5df9SWerner Cornelius if (clear & TIOCM_RTS) 463664d5df9SWerner Cornelius priv->line_control &= ~CH341_BIT_RTS; 464664d5df9SWerner Cornelius if (clear & TIOCM_DTR) 465664d5df9SWerner Cornelius priv->line_control &= ~CH341_BIT_DTR; 466664d5df9SWerner Cornelius control = priv->line_control; 467664d5df9SWerner Cornelius spin_unlock_irqrestore(&priv->lock, flags); 468664d5df9SWerner Cornelius 469664d5df9SWerner Cornelius return ch341_set_handshake(port->serial->dev, control); 470664d5df9SWerner Cornelius } 471664d5df9SWerner Cornelius 472ac035628SJohan Hovold static void ch341_update_line_status(struct usb_serial_port *port, 473ac035628SJohan Hovold unsigned char *data, size_t len) 474ac035628SJohan Hovold { 475ac035628SJohan Hovold struct ch341_private *priv = usb_get_serial_port_data(port); 476b770081fSJohan Hovold struct tty_struct *tty; 477ac035628SJohan Hovold unsigned long flags; 478b770081fSJohan Hovold u8 status; 479b770081fSJohan Hovold u8 delta; 480ac035628SJohan Hovold 481ac035628SJohan Hovold if (len < 4) 482ac035628SJohan Hovold return; 483ac035628SJohan Hovold 484b770081fSJohan Hovold status = ~data[2] & CH341_BITS_MODEM_STAT; 485b770081fSJohan Hovold 486ac035628SJohan Hovold spin_lock_irqsave(&priv->lock, flags); 487b770081fSJohan Hovold delta = status ^ priv->line_status; 488b770081fSJohan Hovold priv->line_status = status; 489ac035628SJohan Hovold spin_unlock_irqrestore(&priv->lock, flags); 490ac035628SJohan Hovold 491fd74b0b1SJohan Hovold if (data[1] & CH341_MULT_STAT) 492fd74b0b1SJohan Hovold dev_dbg(&port->dev, "%s - multiple status change\n", __func__); 493fd74b0b1SJohan Hovold 494d984fe91SJohan Hovold if (!delta) 495d984fe91SJohan Hovold return; 496d984fe91SJohan Hovold 4975e409a26SJohan Hovold if (delta & CH341_BIT_CTS) 4985e409a26SJohan Hovold port->icount.cts++; 4995e409a26SJohan Hovold if (delta & CH341_BIT_DSR) 5005e409a26SJohan Hovold port->icount.dsr++; 5015e409a26SJohan Hovold if (delta & CH341_BIT_RI) 5025e409a26SJohan Hovold port->icount.rng++; 503b770081fSJohan Hovold if (delta & CH341_BIT_DCD) { 5045e409a26SJohan Hovold port->icount.dcd++; 505b770081fSJohan Hovold tty = tty_port_tty_get(&port->port); 506b770081fSJohan Hovold if (tty) { 507ac035628SJohan Hovold usb_serial_handle_dcd_change(port, tty, 508b770081fSJohan Hovold status & CH341_BIT_DCD); 509ac035628SJohan Hovold tty_kref_put(tty); 510ac035628SJohan Hovold } 511b770081fSJohan Hovold } 512ac035628SJohan Hovold 513ac035628SJohan Hovold wake_up_interruptible(&port->port.delta_msr_wait); 514ac035628SJohan Hovold } 515ac035628SJohan Hovold 516664d5df9SWerner Cornelius static void ch341_read_int_callback(struct urb *urb) 517664d5df9SWerner Cornelius { 518271ec2d2SJohan Hovold struct usb_serial_port *port = urb->context; 519664d5df9SWerner Cornelius unsigned char *data = urb->transfer_buffer; 520271ec2d2SJohan Hovold unsigned int len = urb->actual_length; 521664d5df9SWerner Cornelius int status; 522664d5df9SWerner Cornelius 523664d5df9SWerner Cornelius switch (urb->status) { 524664d5df9SWerner Cornelius case 0: 525664d5df9SWerner Cornelius /* success */ 526664d5df9SWerner Cornelius break; 527664d5df9SWerner Cornelius case -ECONNRESET: 528664d5df9SWerner Cornelius case -ENOENT: 529664d5df9SWerner Cornelius case -ESHUTDOWN: 530664d5df9SWerner Cornelius /* this urb is terminated, clean up */ 531271ec2d2SJohan Hovold dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n", 53279cbeeafSGreg Kroah-Hartman __func__, urb->status); 533664d5df9SWerner Cornelius return; 534664d5df9SWerner Cornelius default: 535271ec2d2SJohan Hovold dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", 53679cbeeafSGreg Kroah-Hartman __func__, urb->status); 537664d5df9SWerner Cornelius goto exit; 538664d5df9SWerner Cornelius } 539664d5df9SWerner Cornelius 540271ec2d2SJohan Hovold usb_serial_debug_data(&port->dev, __func__, len, data); 541271ec2d2SJohan Hovold ch341_update_line_status(port, data, len); 542664d5df9SWerner Cornelius exit: 543664d5df9SWerner Cornelius status = usb_submit_urb(urb, GFP_ATOMIC); 544271ec2d2SJohan Hovold if (status) { 545271ec2d2SJohan Hovold dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n", 546664d5df9SWerner Cornelius __func__, status); 547664d5df9SWerner Cornelius } 548271ec2d2SJohan Hovold } 549664d5df9SWerner Cornelius 55060b33c13SAlan Cox static int ch341_tiocmget(struct tty_struct *tty) 551664d5df9SWerner Cornelius { 552664d5df9SWerner Cornelius struct usb_serial_port *port = tty->driver_data; 553664d5df9SWerner Cornelius struct ch341_private *priv = usb_get_serial_port_data(port); 554664d5df9SWerner Cornelius unsigned long flags; 555664d5df9SWerner Cornelius u8 mcr; 556664d5df9SWerner Cornelius u8 status; 557664d5df9SWerner Cornelius unsigned int result; 558664d5df9SWerner Cornelius 559664d5df9SWerner Cornelius spin_lock_irqsave(&priv->lock, flags); 560664d5df9SWerner Cornelius mcr = priv->line_control; 561664d5df9SWerner Cornelius status = priv->line_status; 562664d5df9SWerner Cornelius spin_unlock_irqrestore(&priv->lock, flags); 563664d5df9SWerner Cornelius 564664d5df9SWerner Cornelius result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) 565664d5df9SWerner Cornelius | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) 566664d5df9SWerner Cornelius | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) 567664d5df9SWerner Cornelius | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) 568664d5df9SWerner Cornelius | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) 569664d5df9SWerner Cornelius | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); 570664d5df9SWerner Cornelius 57179cbeeafSGreg Kroah-Hartman dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 572664d5df9SWerner Cornelius 573664d5df9SWerner Cornelius return result; 5746ce76104SFrank A Kingswood } 5756ce76104SFrank A Kingswood 576622b80cfSGreg Kroah-Hartman static int ch341_reset_resume(struct usb_serial *serial) 5771ded7ea4SMing Lei { 5781ded7ea4SMing Lei struct ch341_private *priv; 5791ded7ea4SMing Lei 5801ded7ea4SMing Lei priv = usb_get_serial_port_data(serial->port[0]); 5811ded7ea4SMing Lei 5821ded7ea4SMing Lei /* reconfigure ch341 serial port after bus-reset */ 5832bfd1c96SGreg Kroah-Hartman ch341_configure(serial->dev, priv); 5841ded7ea4SMing Lei 5851ded7ea4SMing Lei return 0; 5861ded7ea4SMing Lei } 5871ded7ea4SMing Lei 5886ce76104SFrank A Kingswood static struct usb_serial_driver ch341_device = { 5896ce76104SFrank A Kingswood .driver = { 5906ce76104SFrank A Kingswood .owner = THIS_MODULE, 5916ce76104SFrank A Kingswood .name = "ch341-uart", 5926ce76104SFrank A Kingswood }, 5936ce76104SFrank A Kingswood .id_table = id_table, 5946ce76104SFrank A Kingswood .num_ports = 1, 5956ce76104SFrank A Kingswood .open = ch341_open, 596335f8514SAlan Cox .dtr_rts = ch341_dtr_rts, 597335f8514SAlan Cox .carrier_raised = ch341_carrier_raised, 598664d5df9SWerner Cornelius .close = ch341_close, 5996ce76104SFrank A Kingswood .set_termios = ch341_set_termios, 600492896f0STim Small .break_ctl = ch341_break_ctl, 601664d5df9SWerner Cornelius .tiocmget = ch341_tiocmget, 602664d5df9SWerner Cornelius .tiocmset = ch341_tiocmset, 6035e409a26SJohan Hovold .tiocmiwait = usb_serial_generic_tiocmiwait, 604664d5df9SWerner Cornelius .read_int_callback = ch341_read_int_callback, 605456c5be5SJohan Hovold .port_probe = ch341_port_probe, 606456c5be5SJohan Hovold .port_remove = ch341_port_remove, 6071c1eaba8SGreg Kroah-Hartman .reset_resume = ch341_reset_resume, 6086ce76104SFrank A Kingswood }; 6096ce76104SFrank A Kingswood 61008a4f6bcSAlan Stern static struct usb_serial_driver * const serial_drivers[] = { 61108a4f6bcSAlan Stern &ch341_device, NULL 61208a4f6bcSAlan Stern }; 61308a4f6bcSAlan Stern 61468e24113SGreg Kroah-Hartman module_usb_serial_driver(serial_drivers, id_table); 6156ce76104SFrank A Kingswood 6166ce76104SFrank A Kingswood MODULE_LICENSE("GPL"); 617