Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk> |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 3 | * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de> |
| 4 | * Copyright 2009, Boris Hajduk <boris@hajduk.org> |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 5 | * |
| 6 | * ch341.c implements a serial port driver for the Winchiphead CH341. |
| 7 | * |
| 8 | * The CH341 device can be used to implement an RS232 asynchronous |
| 9 | * serial port, an IEEE-1284 parallel printer port or a memory-like |
| 10 | * interface. In all cases the CH341 supports an I2C interface as well. |
| 11 | * This driver only supports the asynchronous serial interface. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License version |
| 15 | * 2 as published by the Free Software Foundation. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/tty.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/usb.h> |
| 23 | #include <linux/usb/serial.h> |
| 24 | #include <linux/serial.h> |
| 25 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 26 | #define DEFAULT_BAUD_RATE 9600 |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 27 | #define DEFAULT_TIMEOUT 1000 |
| 28 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 29 | /* flags for IO-Bits */ |
| 30 | #define CH341_BIT_RTS (1 << 6) |
| 31 | #define CH341_BIT_DTR (1 << 5) |
| 32 | |
| 33 | /******************************/ |
| 34 | /* interrupt pipe definitions */ |
| 35 | /******************************/ |
| 36 | /* always 4 interrupt bytes */ |
| 37 | /* first irq byte normally 0x08 */ |
| 38 | /* second irq byte base 0x7d + below */ |
| 39 | /* third irq byte base 0x94 + below */ |
| 40 | /* fourth irq byte normally 0xee */ |
| 41 | |
| 42 | /* second interrupt byte */ |
| 43 | #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ |
| 44 | |
| 45 | /* status returned in third interrupt answer byte, inverted in data |
| 46 | from irq */ |
| 47 | #define CH341_BIT_CTS 0x01 |
| 48 | #define CH341_BIT_DSR 0x02 |
| 49 | #define CH341_BIT_RI 0x04 |
| 50 | #define CH341_BIT_DCD 0x08 |
| 51 | #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ |
| 52 | |
| 53 | /*******************************/ |
| 54 | /* baudrate calculation factor */ |
| 55 | /*******************************/ |
| 56 | #define CH341_BAUDBASE_FACTOR 1532620800 |
| 57 | #define CH341_BAUDBASE_DIVMAX 3 |
| 58 | |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 59 | /* Break support - the information used to implement this was gleaned from |
| 60 | * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. |
| 61 | */ |
| 62 | |
| 63 | #define CH341_REQ_WRITE_REG 0x9A |
| 64 | #define CH341_REQ_READ_REG 0x95 |
| 65 | #define CH341_REG_BREAK1 0x05 |
| 66 | #define CH341_REG_BREAK2 0x18 |
| 67 | #define CH341_NBREAK_BITS_REG1 0x01 |
| 68 | #define CH341_NBREAK_BITS_REG2 0x40 |
| 69 | |
| 70 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 71 | static int debug; |
| 72 | |
| 73 | static struct usb_device_id id_table [] = { |
| 74 | { USB_DEVICE(0x4348, 0x5523) }, |
Michael F. Robbins | 8207823 | 2008-05-16 23:48:42 -0400 | [diff] [blame] | 75 | { USB_DEVICE(0x1a86, 0x7523) }, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 76 | { }, |
| 77 | }; |
| 78 | MODULE_DEVICE_TABLE(usb, id_table); |
| 79 | |
| 80 | struct ch341_private { |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 81 | spinlock_t lock; /* access lock */ |
| 82 | wait_queue_head_t delta_msr_wait; /* wait queue for modem status */ |
| 83 | unsigned baud_rate; /* set baud rate */ |
| 84 | u8 line_control; /* set line control value RTS/DTR */ |
| 85 | u8 line_status; /* active status of modem control inputs */ |
| 86 | u8 multi_status_change; /* status changed multiple since last call */ |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 87 | }; |
| 88 | |
| 89 | static int ch341_control_out(struct usb_device *dev, u8 request, |
| 90 | u16 value, u16 index) |
| 91 | { |
| 92 | int r; |
| 93 | dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40, |
| 94 | (int)request, (int)value, (int)index); |
| 95 | |
| 96 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, |
| 97 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, |
| 98 | value, index, NULL, 0, DEFAULT_TIMEOUT); |
| 99 | |
| 100 | return r; |
| 101 | } |
| 102 | |
| 103 | static int ch341_control_in(struct usb_device *dev, |
| 104 | u8 request, u16 value, u16 index, |
| 105 | char *buf, unsigned bufsize) |
| 106 | { |
| 107 | int r; |
| 108 | dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40, |
| 109 | (int)request, (int)value, (int)index, buf, (int)bufsize); |
| 110 | |
| 111 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, |
| 112 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, |
| 113 | value, index, buf, bufsize, DEFAULT_TIMEOUT); |
| 114 | return r; |
| 115 | } |
| 116 | |
Adrian Bunk | 93b6497 | 2007-09-09 22:25:04 +0200 | [diff] [blame] | 117 | static int ch341_set_baudrate(struct usb_device *dev, |
| 118 | struct ch341_private *priv) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 119 | { |
| 120 | short a, b; |
| 121 | int r; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 122 | unsigned long factor; |
| 123 | short divisor; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 124 | |
| 125 | dbg("ch341_set_baudrate(%d)", priv->baud_rate); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 126 | |
| 127 | if (!priv->baud_rate) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 128 | return -EINVAL; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 129 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
| 130 | divisor = CH341_BAUDBASE_DIVMAX; |
| 131 | |
| 132 | while ((factor > 0xfff0) && divisor) { |
| 133 | factor >>= 3; |
| 134 | divisor--; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 135 | } |
| 136 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 137 | if (factor > 0xfff0) |
| 138 | return -EINVAL; |
| 139 | |
| 140 | factor = 0x10000 - factor; |
| 141 | a = (factor & 0xff00) | divisor; |
| 142 | b = factor & 0xff; |
| 143 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 144 | r = ch341_control_out(dev, 0x9a, 0x1312, a); |
| 145 | if (!r) |
| 146 | r = ch341_control_out(dev, 0x9a, 0x0f2c, b); |
| 147 | |
| 148 | return r; |
| 149 | } |
| 150 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 151 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 152 | { |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 153 | dbg("ch341_set_handshake(0x%02x)", control); |
| 154 | return ch341_control_out(dev, 0xa4, ~control, 0); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 155 | } |
| 156 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 157 | static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 158 | { |
| 159 | char *buffer; |
| 160 | int r; |
| 161 | const unsigned size = 8; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 162 | unsigned long flags; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 163 | |
| 164 | dbg("ch341_get_status()"); |
| 165 | |
| 166 | buffer = kmalloc(size, GFP_KERNEL); |
| 167 | if (!buffer) |
| 168 | return -ENOMEM; |
| 169 | |
| 170 | r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); |
Alan Cox | c4d0f8c | 2008-04-29 14:35:39 +0100 | [diff] [blame] | 171 | if (r < 0) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 172 | goto out; |
| 173 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 174 | /* setup the private status if available */ |
| 175 | if (r == 2) { |
| 176 | r = 0; |
| 177 | spin_lock_irqsave(&priv->lock, flags); |
| 178 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; |
| 179 | priv->multi_status_change = 0; |
| 180 | spin_unlock_irqrestore(&priv->lock, flags); |
| 181 | } else |
| 182 | r = -EPROTO; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 183 | |
| 184 | out: kfree(buffer); |
| 185 | return r; |
| 186 | } |
| 187 | |
| 188 | /* -------------------------------------------------------------------------- */ |
| 189 | |
Adrian Bunk | 93b6497 | 2007-09-09 22:25:04 +0200 | [diff] [blame] | 190 | static int ch341_configure(struct usb_device *dev, struct ch341_private *priv) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 191 | { |
| 192 | char *buffer; |
| 193 | int r; |
| 194 | const unsigned size = 8; |
| 195 | |
| 196 | dbg("ch341_configure()"); |
| 197 | |
| 198 | buffer = kmalloc(size, GFP_KERNEL); |
| 199 | if (!buffer) |
| 200 | return -ENOMEM; |
| 201 | |
| 202 | /* expect two bytes 0x27 0x00 */ |
| 203 | r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); |
| 204 | if (r < 0) |
| 205 | goto out; |
| 206 | |
| 207 | r = ch341_control_out(dev, 0xa1, 0, 0); |
| 208 | if (r < 0) |
| 209 | goto out; |
| 210 | |
| 211 | r = ch341_set_baudrate(dev, priv); |
| 212 | if (r < 0) |
| 213 | goto out; |
| 214 | |
| 215 | /* expect two bytes 0x56 0x00 */ |
| 216 | r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); |
| 217 | if (r < 0) |
| 218 | goto out; |
| 219 | |
| 220 | r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); |
| 221 | if (r < 0) |
| 222 | goto out; |
| 223 | |
| 224 | /* expect 0xff 0xee */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 225 | r = ch341_get_status(dev, priv); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 226 | if (r < 0) |
| 227 | goto out; |
| 228 | |
| 229 | r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); |
| 230 | if (r < 0) |
| 231 | goto out; |
| 232 | |
| 233 | r = ch341_set_baudrate(dev, priv); |
| 234 | if (r < 0) |
| 235 | goto out; |
| 236 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 237 | r = ch341_set_handshake(dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 238 | if (r < 0) |
| 239 | goto out; |
| 240 | |
| 241 | /* expect 0x9f 0xee */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 242 | r = ch341_get_status(dev, priv); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 243 | |
| 244 | out: kfree(buffer); |
| 245 | return r; |
| 246 | } |
| 247 | |
| 248 | /* allocate private data */ |
| 249 | static int ch341_attach(struct usb_serial *serial) |
| 250 | { |
| 251 | struct ch341_private *priv; |
| 252 | int r; |
| 253 | |
| 254 | dbg("ch341_attach()"); |
| 255 | |
| 256 | /* private data */ |
| 257 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); |
| 258 | if (!priv) |
| 259 | return -ENOMEM; |
| 260 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 261 | spin_lock_init(&priv->lock); |
| 262 | init_waitqueue_head(&priv->delta_msr_wait); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 263 | priv->baud_rate = DEFAULT_BAUD_RATE; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 264 | priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 265 | |
| 266 | r = ch341_configure(serial->dev, priv); |
| 267 | if (r < 0) |
| 268 | goto error; |
| 269 | |
| 270 | usb_set_serial_port_data(serial->port[0], priv); |
| 271 | return 0; |
| 272 | |
| 273 | error: kfree(priv); |
| 274 | return r; |
| 275 | } |
| 276 | |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 277 | static int ch341_carrier_raised(struct usb_serial_port *port) |
| 278 | { |
| 279 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 280 | if (priv->line_status & CH341_BIT_DCD) |
| 281 | return 1; |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 286 | { |
| 287 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 288 | unsigned long flags; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 289 | |
| 290 | dbg("%s - port %d", __func__, port->number); |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 291 | /* drop DTR and RTS */ |
| 292 | spin_lock_irqsave(&priv->lock, flags); |
| 293 | if (on) |
| 294 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; |
| 295 | else |
| 296 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); |
| 297 | spin_unlock_irqrestore(&priv->lock, flags); |
| 298 | ch341_set_handshake(port->serial->dev, priv->line_control); |
| 299 | wake_up_interruptible(&priv->delta_msr_wait); |
| 300 | } |
| 301 | |
| 302 | static void ch341_close(struct usb_serial_port *port) |
| 303 | { |
| 304 | dbg("%s - port %d", __func__, port->number); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 305 | |
| 306 | /* shutdown our urbs */ |
| 307 | dbg("%s - shutting down urbs", __func__); |
| 308 | usb_kill_urb(port->write_urb); |
| 309 | usb_kill_urb(port->read_urb); |
| 310 | usb_kill_urb(port->interrupt_in_urb); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 314 | /* open this device, set default parameters */ |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 315 | static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 316 | { |
| 317 | struct usb_serial *serial = port->serial; |
| 318 | struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]); |
| 319 | int r; |
| 320 | |
| 321 | dbg("ch341_open()"); |
| 322 | |
| 323 | priv->baud_rate = DEFAULT_BAUD_RATE; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 324 | |
| 325 | r = ch341_configure(serial->dev, priv); |
| 326 | if (r) |
| 327 | goto out; |
| 328 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 329 | r = ch341_set_handshake(serial->dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 330 | if (r) |
| 331 | goto out; |
| 332 | |
| 333 | r = ch341_set_baudrate(serial->dev, priv); |
| 334 | if (r) |
| 335 | goto out; |
| 336 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 337 | dbg("%s - submitting interrupt urb", __func__); |
| 338 | port->interrupt_in_urb->dev = serial->dev; |
| 339 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| 340 | if (r) { |
| 341 | dev_err(&port->dev, "%s - failed submitting interrupt urb," |
| 342 | " error %d\n", __func__, r); |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 343 | ch341_close(port); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 344 | return -EPROTO; |
| 345 | } |
| 346 | |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 347 | r = usb_serial_generic_open(tty, port); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 348 | |
| 349 | out: return r; |
| 350 | } |
| 351 | |
| 352 | /* Old_termios contains the original termios settings and |
| 353 | * tty->termios contains the new setting to be used. |
| 354 | */ |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 355 | static void ch341_set_termios(struct tty_struct *tty, |
| 356 | struct usb_serial_port *port, struct ktermios *old_termios) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 357 | { |
| 358 | struct ch341_private *priv = usb_get_serial_port_data(port); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 359 | unsigned baud_rate; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 360 | unsigned long flags; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 361 | |
| 362 | dbg("ch341_set_termios()"); |
| 363 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 364 | baud_rate = tty_get_baud_rate(tty); |
| 365 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 366 | priv->baud_rate = baud_rate; |
| 367 | |
| 368 | if (baud_rate) { |
| 369 | spin_lock_irqsave(&priv->lock, flags); |
| 370 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); |
| 371 | spin_unlock_irqrestore(&priv->lock, flags); |
| 372 | ch341_set_baudrate(port->serial->dev, priv); |
| 373 | } else { |
| 374 | spin_lock_irqsave(&priv->lock, flags); |
| 375 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); |
| 376 | spin_unlock_irqrestore(&priv->lock, flags); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 377 | } |
| 378 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 379 | ch341_set_handshake(port->serial->dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 380 | |
| 381 | /* Unimplemented: |
| 382 | * (cflag & CSIZE) : data bits [5, 8] |
| 383 | * (cflag & PARENB) : parity {NONE, EVEN, ODD} |
| 384 | * (cflag & CSTOPB) : stop bits [1, 2] |
| 385 | */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 386 | } |
Alan Cox | 73f5930 | 2007-10-18 01:24:18 -0700 | [diff] [blame] | 387 | |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 388 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
| 389 | { |
| 390 | const uint16_t ch341_break_reg = |
| 391 | CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); |
| 392 | struct usb_serial_port *port = tty->driver_data; |
| 393 | int r; |
| 394 | uint16_t reg_contents; |
| 395 | uint8_t break_reg[2]; |
| 396 | |
| 397 | dbg("%s()", __func__); |
| 398 | |
| 399 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
| 400 | ch341_break_reg, 0, break_reg, sizeof(break_reg)); |
| 401 | if (r < 0) { |
Johan Hovold | 6a9b15f | 2009-12-28 23:01:45 +0100 | [diff] [blame^] | 402 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
| 403 | __func__, r); |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 404 | return; |
| 405 | } |
| 406 | dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x", |
| 407 | __func__, break_reg[0], break_reg[1]); |
| 408 | if (break_state != 0) { |
| 409 | dbg("%s - Enter break state requested", __func__); |
| 410 | break_reg[0] &= ~CH341_NBREAK_BITS_REG1; |
| 411 | break_reg[1] &= ~CH341_NBREAK_BITS_REG2; |
| 412 | } else { |
| 413 | dbg("%s - Leave break state requested", __func__); |
| 414 | break_reg[0] |= CH341_NBREAK_BITS_REG1; |
| 415 | break_reg[1] |= CH341_NBREAK_BITS_REG2; |
| 416 | } |
| 417 | dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x", |
| 418 | __func__, break_reg[0], break_reg[1]); |
| 419 | reg_contents = (uint16_t)break_reg[0] | ((uint16_t)break_reg[1] << 8); |
| 420 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
| 421 | ch341_break_reg, reg_contents); |
| 422 | if (r < 0) |
Johan Hovold | 6a9b15f | 2009-12-28 23:01:45 +0100 | [diff] [blame^] | 423 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
| 424 | __func__, r); |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 425 | } |
| 426 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 427 | static int ch341_tiocmset(struct tty_struct *tty, struct file *file, |
| 428 | unsigned int set, unsigned int clear) |
| 429 | { |
| 430 | struct usb_serial_port *port = tty->driver_data; |
| 431 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 432 | unsigned long flags; |
| 433 | u8 control; |
| 434 | |
| 435 | spin_lock_irqsave(&priv->lock, flags); |
| 436 | if (set & TIOCM_RTS) |
| 437 | priv->line_control |= CH341_BIT_RTS; |
| 438 | if (set & TIOCM_DTR) |
| 439 | priv->line_control |= CH341_BIT_DTR; |
| 440 | if (clear & TIOCM_RTS) |
| 441 | priv->line_control &= ~CH341_BIT_RTS; |
| 442 | if (clear & TIOCM_DTR) |
| 443 | priv->line_control &= ~CH341_BIT_DTR; |
| 444 | control = priv->line_control; |
| 445 | spin_unlock_irqrestore(&priv->lock, flags); |
| 446 | |
| 447 | return ch341_set_handshake(port->serial->dev, control); |
| 448 | } |
| 449 | |
| 450 | static void ch341_read_int_callback(struct urb *urb) |
| 451 | { |
| 452 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; |
| 453 | unsigned char *data = urb->transfer_buffer; |
| 454 | unsigned int actual_length = urb->actual_length; |
| 455 | int status; |
| 456 | |
| 457 | dbg("%s (%d)", __func__, port->number); |
| 458 | |
| 459 | switch (urb->status) { |
| 460 | case 0: |
| 461 | /* success */ |
| 462 | break; |
| 463 | case -ECONNRESET: |
| 464 | case -ENOENT: |
| 465 | case -ESHUTDOWN: |
| 466 | /* this urb is terminated, clean up */ |
| 467 | dbg("%s - urb shutting down with status: %d", __func__, |
| 468 | urb->status); |
| 469 | return; |
| 470 | default: |
| 471 | dbg("%s - nonzero urb status received: %d", __func__, |
| 472 | urb->status); |
| 473 | goto exit; |
| 474 | } |
| 475 | |
| 476 | usb_serial_debug_data(debug, &port->dev, __func__, |
| 477 | urb->actual_length, urb->transfer_buffer); |
| 478 | |
| 479 | if (actual_length >= 4) { |
| 480 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 481 | unsigned long flags; |
| 482 | |
| 483 | spin_lock_irqsave(&priv->lock, flags); |
| 484 | priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; |
| 485 | if ((data[1] & CH341_MULT_STAT)) |
| 486 | priv->multi_status_change = 1; |
| 487 | spin_unlock_irqrestore(&priv->lock, flags); |
| 488 | wake_up_interruptible(&priv->delta_msr_wait); |
| 489 | } |
| 490 | |
| 491 | exit: |
| 492 | status = usb_submit_urb(urb, GFP_ATOMIC); |
| 493 | if (status) |
| 494 | dev_err(&urb->dev->dev, |
| 495 | "%s - usb_submit_urb failed with result %d\n", |
| 496 | __func__, status); |
| 497 | } |
| 498 | |
| 499 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) |
| 500 | { |
| 501 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 502 | unsigned long flags; |
| 503 | u8 prevstatus; |
| 504 | u8 status; |
| 505 | u8 changed; |
| 506 | u8 multi_change = 0; |
| 507 | |
| 508 | spin_lock_irqsave(&priv->lock, flags); |
| 509 | prevstatus = priv->line_status; |
| 510 | priv->multi_status_change = 0; |
| 511 | spin_unlock_irqrestore(&priv->lock, flags); |
| 512 | |
| 513 | while (!multi_change) { |
| 514 | interruptible_sleep_on(&priv->delta_msr_wait); |
| 515 | /* see if a signal did it */ |
| 516 | if (signal_pending(current)) |
| 517 | return -ERESTARTSYS; |
| 518 | |
| 519 | spin_lock_irqsave(&priv->lock, flags); |
| 520 | status = priv->line_status; |
| 521 | multi_change = priv->multi_status_change; |
| 522 | spin_unlock_irqrestore(&priv->lock, flags); |
| 523 | |
| 524 | changed = prevstatus ^ status; |
| 525 | |
| 526 | if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || |
| 527 | ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || |
| 528 | ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || |
| 529 | ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) { |
| 530 | return 0; |
| 531 | } |
| 532 | prevstatus = status; |
| 533 | } |
| 534 | |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | /*static int ch341_ioctl(struct usb_serial_port *port, struct file *file,*/ |
| 539 | static int ch341_ioctl(struct tty_struct *tty, struct file *file, |
| 540 | unsigned int cmd, unsigned long arg) |
| 541 | { |
| 542 | struct usb_serial_port *port = tty->driver_data; |
| 543 | dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd); |
| 544 | |
| 545 | switch (cmd) { |
| 546 | case TIOCMIWAIT: |
| 547 | dbg("%s (%d) TIOCMIWAIT", __func__, port->number); |
| 548 | return wait_modem_info(port, arg); |
| 549 | |
| 550 | default: |
| 551 | dbg("%s not supported = 0x%04x", __func__, cmd); |
| 552 | break; |
| 553 | } |
| 554 | |
| 555 | return -ENOIOCTLCMD; |
| 556 | } |
| 557 | |
| 558 | static int ch341_tiocmget(struct tty_struct *tty, struct file *file) |
| 559 | { |
| 560 | struct usb_serial_port *port = tty->driver_data; |
| 561 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 562 | unsigned long flags; |
| 563 | u8 mcr; |
| 564 | u8 status; |
| 565 | unsigned int result; |
| 566 | |
| 567 | dbg("%s (%d)", __func__, port->number); |
| 568 | |
| 569 | spin_lock_irqsave(&priv->lock, flags); |
| 570 | mcr = priv->line_control; |
| 571 | status = priv->line_status; |
| 572 | spin_unlock_irqrestore(&priv->lock, flags); |
| 573 | |
| 574 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) |
| 575 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) |
| 576 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) |
| 577 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) |
| 578 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) |
| 579 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); |
| 580 | |
| 581 | dbg("%s - result = %x", __func__, result); |
| 582 | |
| 583 | return result; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 584 | } |
| 585 | |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 586 | |
| 587 | static int ch341_reset_resume(struct usb_interface *intf) |
| 588 | { |
| 589 | struct usb_device *dev = interface_to_usbdev(intf); |
| 590 | struct usb_serial *serial = NULL; |
| 591 | struct ch341_private *priv; |
| 592 | |
| 593 | serial = usb_get_intfdata(intf); |
| 594 | priv = usb_get_serial_port_data(serial->port[0]); |
| 595 | |
| 596 | /*reconfigure ch341 serial port after bus-reset*/ |
| 597 | ch341_configure(dev, priv); |
| 598 | |
| 599 | usb_serial_resume(intf); |
| 600 | |
| 601 | return 0; |
| 602 | } |
| 603 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 604 | static struct usb_driver ch341_driver = { |
| 605 | .name = "ch341", |
| 606 | .probe = usb_serial_probe, |
| 607 | .disconnect = usb_serial_disconnect, |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 608 | .suspend = usb_serial_suspend, |
| 609 | .resume = usb_serial_resume, |
| 610 | .reset_resume = ch341_reset_resume, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 611 | .id_table = id_table, |
| 612 | .no_dynamic_id = 1, |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 613 | .supports_autosuspend = 1, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 614 | }; |
| 615 | |
| 616 | static struct usb_serial_driver ch341_device = { |
| 617 | .driver = { |
| 618 | .owner = THIS_MODULE, |
| 619 | .name = "ch341-uart", |
| 620 | }, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 621 | .id_table = id_table, |
| 622 | .usb_driver = &ch341_driver, |
| 623 | .num_ports = 1, |
| 624 | .open = ch341_open, |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 625 | .dtr_rts = ch341_dtr_rts, |
| 626 | .carrier_raised = ch341_carrier_raised, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 627 | .close = ch341_close, |
| 628 | .ioctl = ch341_ioctl, |
| 629 | .set_termios = ch341_set_termios, |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 630 | .break_ctl = ch341_break_ctl, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 631 | .tiocmget = ch341_tiocmget, |
| 632 | .tiocmset = ch341_tiocmset, |
| 633 | .read_int_callback = ch341_read_int_callback, |
| 634 | .attach = ch341_attach, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 635 | }; |
| 636 | |
| 637 | static int __init ch341_init(void) |
| 638 | { |
| 639 | int retval; |
| 640 | |
| 641 | retval = usb_serial_register(&ch341_device); |
| 642 | if (retval) |
| 643 | return retval; |
| 644 | retval = usb_register(&ch341_driver); |
| 645 | if (retval) |
| 646 | usb_serial_deregister(&ch341_device); |
| 647 | return retval; |
| 648 | } |
| 649 | |
| 650 | static void __exit ch341_exit(void) |
| 651 | { |
| 652 | usb_deregister(&ch341_driver); |
| 653 | usb_serial_deregister(&ch341_device); |
| 654 | } |
| 655 | |
| 656 | module_init(ch341_init); |
| 657 | module_exit(ch341_exit); |
| 658 | MODULE_LICENSE("GPL"); |
| 659 | |
| 660 | module_param(debug, bool, S_IRUGO | S_IWUSR); |
| 661 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |
| 662 | |
| 663 | /* EOF ch341.c */ |