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> |
Johan Hovold | 5be796f | 2009-12-31 16:47:59 +0100 | [diff] [blame] | 25 | #include <asm/unaligned.h> |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 26 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 27 | #define DEFAULT_BAUD_RATE 9600 |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 28 | #define DEFAULT_TIMEOUT 1000 |
| 29 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 30 | /* flags for IO-Bits */ |
| 31 | #define CH341_BIT_RTS (1 << 6) |
| 32 | #define CH341_BIT_DTR (1 << 5) |
| 33 | |
| 34 | /******************************/ |
| 35 | /* interrupt pipe definitions */ |
| 36 | /******************************/ |
| 37 | /* always 4 interrupt bytes */ |
| 38 | /* first irq byte normally 0x08 */ |
| 39 | /* second irq byte base 0x7d + below */ |
| 40 | /* third irq byte base 0x94 + below */ |
| 41 | /* fourth irq byte normally 0xee */ |
| 42 | |
| 43 | /* second interrupt byte */ |
| 44 | #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ |
| 45 | |
| 46 | /* status returned in third interrupt answer byte, inverted in data |
| 47 | from irq */ |
| 48 | #define CH341_BIT_CTS 0x01 |
| 49 | #define CH341_BIT_DSR 0x02 |
| 50 | #define CH341_BIT_RI 0x04 |
| 51 | #define CH341_BIT_DCD 0x08 |
| 52 | #define CH341_BITS_MODEM_STAT 0x0f /* all bits */ |
| 53 | |
| 54 | /*******************************/ |
| 55 | /* baudrate calculation factor */ |
| 56 | /*******************************/ |
| 57 | #define CH341_BAUDBASE_FACTOR 1532620800 |
| 58 | #define CH341_BAUDBASE_DIVMAX 3 |
| 59 | |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 60 | /* Break support - the information used to implement this was gleaned from |
| 61 | * the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato. |
| 62 | */ |
| 63 | |
| 64 | #define CH341_REQ_WRITE_REG 0x9A |
| 65 | #define CH341_REQ_READ_REG 0x95 |
| 66 | #define CH341_REG_BREAK1 0x05 |
| 67 | #define CH341_REG_BREAK2 0x18 |
| 68 | #define CH341_NBREAK_BITS_REG1 0x01 |
| 69 | #define CH341_NBREAK_BITS_REG2 0x40 |
| 70 | |
| 71 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 72 | static int debug; |
| 73 | |
Németh Márton | 7d40d7e | 2010-01-10 15:34:24 +0100 | [diff] [blame^] | 74 | static const struct usb_device_id id_table[] = { |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 75 | { USB_DEVICE(0x4348, 0x5523) }, |
Michael F. Robbins | 8207823 | 2008-05-16 23:48:42 -0400 | [diff] [blame] | 76 | { USB_DEVICE(0x1a86, 0x7523) }, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 77 | { }, |
| 78 | }; |
| 79 | MODULE_DEVICE_TABLE(usb, id_table); |
| 80 | |
| 81 | struct ch341_private { |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 82 | spinlock_t lock; /* access lock */ |
| 83 | wait_queue_head_t delta_msr_wait; /* wait queue for modem status */ |
| 84 | unsigned baud_rate; /* set baud rate */ |
| 85 | u8 line_control; /* set line control value RTS/DTR */ |
| 86 | u8 line_status; /* active status of modem control inputs */ |
| 87 | u8 multi_status_change; /* status changed multiple since last call */ |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 88 | }; |
| 89 | |
| 90 | static int ch341_control_out(struct usb_device *dev, u8 request, |
| 91 | u16 value, u16 index) |
| 92 | { |
| 93 | int r; |
| 94 | dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40, |
| 95 | (int)request, (int)value, (int)index); |
| 96 | |
| 97 | r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, |
| 98 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, |
| 99 | value, index, NULL, 0, DEFAULT_TIMEOUT); |
| 100 | |
| 101 | return r; |
| 102 | } |
| 103 | |
| 104 | static int ch341_control_in(struct usb_device *dev, |
| 105 | u8 request, u16 value, u16 index, |
| 106 | char *buf, unsigned bufsize) |
| 107 | { |
| 108 | int r; |
| 109 | dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40, |
| 110 | (int)request, (int)value, (int)index, buf, (int)bufsize); |
| 111 | |
| 112 | r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, |
| 113 | USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, |
| 114 | value, index, buf, bufsize, DEFAULT_TIMEOUT); |
| 115 | return r; |
| 116 | } |
| 117 | |
Adrian Bunk | 93b6497 | 2007-09-09 22:25:04 +0200 | [diff] [blame] | 118 | static int ch341_set_baudrate(struct usb_device *dev, |
| 119 | struct ch341_private *priv) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 120 | { |
| 121 | short a, b; |
| 122 | int r; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 123 | unsigned long factor; |
| 124 | short divisor; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 125 | |
| 126 | dbg("ch341_set_baudrate(%d)", priv->baud_rate); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 127 | |
| 128 | if (!priv->baud_rate) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 129 | return -EINVAL; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 130 | factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); |
| 131 | divisor = CH341_BAUDBASE_DIVMAX; |
| 132 | |
| 133 | while ((factor > 0xfff0) && divisor) { |
| 134 | factor >>= 3; |
| 135 | divisor--; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 136 | } |
| 137 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 138 | if (factor > 0xfff0) |
| 139 | return -EINVAL; |
| 140 | |
| 141 | factor = 0x10000 - factor; |
| 142 | a = (factor & 0xff00) | divisor; |
| 143 | b = factor & 0xff; |
| 144 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 145 | r = ch341_control_out(dev, 0x9a, 0x1312, a); |
| 146 | if (!r) |
| 147 | r = ch341_control_out(dev, 0x9a, 0x0f2c, b); |
| 148 | |
| 149 | return r; |
| 150 | } |
| 151 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 152 | static int ch341_set_handshake(struct usb_device *dev, u8 control) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 153 | { |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 154 | dbg("ch341_set_handshake(0x%02x)", control); |
| 155 | return ch341_control_out(dev, 0xa4, ~control, 0); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 156 | } |
| 157 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 158 | 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] | 159 | { |
| 160 | char *buffer; |
| 161 | int r; |
| 162 | const unsigned size = 8; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 163 | unsigned long flags; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 164 | |
| 165 | dbg("ch341_get_status()"); |
| 166 | |
| 167 | buffer = kmalloc(size, GFP_KERNEL); |
| 168 | if (!buffer) |
| 169 | return -ENOMEM; |
| 170 | |
| 171 | r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); |
Alan Cox | c4d0f8c | 2008-04-29 14:35:39 +0100 | [diff] [blame] | 172 | if (r < 0) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 173 | goto out; |
| 174 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 175 | /* setup the private status if available */ |
| 176 | if (r == 2) { |
| 177 | r = 0; |
| 178 | spin_lock_irqsave(&priv->lock, flags); |
| 179 | priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; |
| 180 | priv->multi_status_change = 0; |
| 181 | spin_unlock_irqrestore(&priv->lock, flags); |
| 182 | } else |
| 183 | r = -EPROTO; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 184 | |
| 185 | out: kfree(buffer); |
| 186 | return r; |
| 187 | } |
| 188 | |
| 189 | /* -------------------------------------------------------------------------- */ |
| 190 | |
Adrian Bunk | 93b6497 | 2007-09-09 22:25:04 +0200 | [diff] [blame] | 191 | 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] | 192 | { |
| 193 | char *buffer; |
| 194 | int r; |
| 195 | const unsigned size = 8; |
| 196 | |
| 197 | dbg("ch341_configure()"); |
| 198 | |
| 199 | buffer = kmalloc(size, GFP_KERNEL); |
| 200 | if (!buffer) |
| 201 | return -ENOMEM; |
| 202 | |
| 203 | /* expect two bytes 0x27 0x00 */ |
| 204 | r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); |
| 205 | if (r < 0) |
| 206 | goto out; |
| 207 | |
| 208 | r = ch341_control_out(dev, 0xa1, 0, 0); |
| 209 | if (r < 0) |
| 210 | goto out; |
| 211 | |
| 212 | r = ch341_set_baudrate(dev, priv); |
| 213 | if (r < 0) |
| 214 | goto out; |
| 215 | |
| 216 | /* expect two bytes 0x56 0x00 */ |
| 217 | r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); |
| 218 | if (r < 0) |
| 219 | goto out; |
| 220 | |
| 221 | r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); |
| 222 | if (r < 0) |
| 223 | goto out; |
| 224 | |
| 225 | /* expect 0xff 0xee */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 226 | r = ch341_get_status(dev, priv); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 227 | if (r < 0) |
| 228 | goto out; |
| 229 | |
| 230 | r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); |
| 231 | if (r < 0) |
| 232 | goto out; |
| 233 | |
| 234 | r = ch341_set_baudrate(dev, priv); |
| 235 | if (r < 0) |
| 236 | goto out; |
| 237 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 238 | r = ch341_set_handshake(dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 239 | if (r < 0) |
| 240 | goto out; |
| 241 | |
| 242 | /* expect 0x9f 0xee */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 243 | r = ch341_get_status(dev, priv); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 244 | |
| 245 | out: kfree(buffer); |
| 246 | return r; |
| 247 | } |
| 248 | |
| 249 | /* allocate private data */ |
| 250 | static int ch341_attach(struct usb_serial *serial) |
| 251 | { |
| 252 | struct ch341_private *priv; |
| 253 | int r; |
| 254 | |
| 255 | dbg("ch341_attach()"); |
| 256 | |
| 257 | /* private data */ |
| 258 | priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); |
| 259 | if (!priv) |
| 260 | return -ENOMEM; |
| 261 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 262 | spin_lock_init(&priv->lock); |
| 263 | init_waitqueue_head(&priv->delta_msr_wait); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 264 | priv->baud_rate = DEFAULT_BAUD_RATE; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 265 | priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 266 | |
| 267 | r = ch341_configure(serial->dev, priv); |
| 268 | if (r < 0) |
| 269 | goto error; |
| 270 | |
| 271 | usb_set_serial_port_data(serial->port[0], priv); |
| 272 | return 0; |
| 273 | |
| 274 | error: kfree(priv); |
| 275 | return r; |
| 276 | } |
| 277 | |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 278 | static int ch341_carrier_raised(struct usb_serial_port *port) |
| 279 | { |
| 280 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 281 | if (priv->line_status & CH341_BIT_DCD) |
| 282 | return 1; |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static void ch341_dtr_rts(struct usb_serial_port *port, int on) |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 287 | { |
| 288 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 289 | unsigned long flags; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 290 | |
| 291 | dbg("%s - port %d", __func__, port->number); |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 292 | /* drop DTR and RTS */ |
| 293 | spin_lock_irqsave(&priv->lock, flags); |
| 294 | if (on) |
| 295 | priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR; |
| 296 | else |
| 297 | priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR); |
| 298 | spin_unlock_irqrestore(&priv->lock, flags); |
| 299 | ch341_set_handshake(port->serial->dev, priv->line_control); |
| 300 | wake_up_interruptible(&priv->delta_msr_wait); |
| 301 | } |
| 302 | |
| 303 | static void ch341_close(struct usb_serial_port *port) |
| 304 | { |
| 305 | dbg("%s - port %d", __func__, port->number); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 306 | |
| 307 | /* shutdown our urbs */ |
| 308 | dbg("%s - shutting down urbs", __func__); |
| 309 | usb_kill_urb(port->write_urb); |
| 310 | usb_kill_urb(port->read_urb); |
| 311 | usb_kill_urb(port->interrupt_in_urb); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 315 | /* open this device, set default parameters */ |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 316 | 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] | 317 | { |
| 318 | struct usb_serial *serial = port->serial; |
| 319 | struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]); |
| 320 | int r; |
| 321 | |
| 322 | dbg("ch341_open()"); |
| 323 | |
| 324 | priv->baud_rate = DEFAULT_BAUD_RATE; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 325 | |
| 326 | r = ch341_configure(serial->dev, priv); |
| 327 | if (r) |
| 328 | goto out; |
| 329 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 330 | r = ch341_set_handshake(serial->dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 331 | if (r) |
| 332 | goto out; |
| 333 | |
| 334 | r = ch341_set_baudrate(serial->dev, priv); |
| 335 | if (r) |
| 336 | goto out; |
| 337 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 338 | dbg("%s - submitting interrupt urb", __func__); |
| 339 | port->interrupt_in_urb->dev = serial->dev; |
| 340 | r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| 341 | if (r) { |
| 342 | dev_err(&port->dev, "%s - failed submitting interrupt urb," |
| 343 | " error %d\n", __func__, r); |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 344 | ch341_close(port); |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 345 | return -EPROTO; |
| 346 | } |
| 347 | |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 348 | r = usb_serial_generic_open(tty, port); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 349 | |
| 350 | out: return r; |
| 351 | } |
| 352 | |
| 353 | /* Old_termios contains the original termios settings and |
| 354 | * tty->termios contains the new setting to be used. |
| 355 | */ |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 356 | static void ch341_set_termios(struct tty_struct *tty, |
| 357 | struct usb_serial_port *port, struct ktermios *old_termios) |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 358 | { |
| 359 | struct ch341_private *priv = usb_get_serial_port_data(port); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 360 | unsigned baud_rate; |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 361 | unsigned long flags; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 362 | |
| 363 | dbg("ch341_set_termios()"); |
| 364 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 365 | baud_rate = tty_get_baud_rate(tty); |
| 366 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 367 | priv->baud_rate = baud_rate; |
| 368 | |
| 369 | if (baud_rate) { |
| 370 | spin_lock_irqsave(&priv->lock, flags); |
| 371 | priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); |
| 372 | spin_unlock_irqrestore(&priv->lock, flags); |
| 373 | ch341_set_baudrate(port->serial->dev, priv); |
| 374 | } else { |
| 375 | spin_lock_irqsave(&priv->lock, flags); |
| 376 | priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); |
| 377 | spin_unlock_irqrestore(&priv->lock, flags); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 378 | } |
| 379 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 380 | ch341_set_handshake(port->serial->dev, priv->line_control); |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 381 | |
| 382 | /* Unimplemented: |
| 383 | * (cflag & CSIZE) : data bits [5, 8] |
| 384 | * (cflag & PARENB) : parity {NONE, EVEN, ODD} |
| 385 | * (cflag & CSTOPB) : stop bits [1, 2] |
| 386 | */ |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 387 | } |
Alan Cox | 73f5930 | 2007-10-18 01:24:18 -0700 | [diff] [blame] | 388 | |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 389 | static void ch341_break_ctl(struct tty_struct *tty, int break_state) |
| 390 | { |
| 391 | const uint16_t ch341_break_reg = |
| 392 | CH341_REG_BREAK1 | ((uint16_t) CH341_REG_BREAK2 << 8); |
| 393 | struct usb_serial_port *port = tty->driver_data; |
| 394 | int r; |
| 395 | uint16_t reg_contents; |
Johan Hovold | f2b5cc8 | 2009-12-28 23:01:46 +0100 | [diff] [blame] | 396 | uint8_t *break_reg; |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 397 | |
| 398 | dbg("%s()", __func__); |
| 399 | |
Johan Hovold | f2b5cc8 | 2009-12-28 23:01:46 +0100 | [diff] [blame] | 400 | break_reg = kmalloc(2, GFP_KERNEL); |
| 401 | if (!break_reg) { |
| 402 | dev_err(&port->dev, "%s - kmalloc failed\n", __func__); |
| 403 | return; |
| 404 | } |
| 405 | |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 406 | r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG, |
Johan Hovold | f2b5cc8 | 2009-12-28 23:01:46 +0100 | [diff] [blame] | 407 | ch341_break_reg, 0, break_reg, 2); |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 408 | if (r < 0) { |
Johan Hovold | 6a9b15f | 2009-12-28 23:01:45 +0100 | [diff] [blame] | 409 | dev_err(&port->dev, "%s - USB control read error (%d)\n", |
| 410 | __func__, r); |
Johan Hovold | f2b5cc8 | 2009-12-28 23:01:46 +0100 | [diff] [blame] | 411 | goto out; |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 412 | } |
| 413 | dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x", |
| 414 | __func__, break_reg[0], break_reg[1]); |
| 415 | if (break_state != 0) { |
| 416 | dbg("%s - Enter break state requested", __func__); |
| 417 | break_reg[0] &= ~CH341_NBREAK_BITS_REG1; |
| 418 | break_reg[1] &= ~CH341_NBREAK_BITS_REG2; |
| 419 | } else { |
| 420 | dbg("%s - Leave break state requested", __func__); |
| 421 | break_reg[0] |= CH341_NBREAK_BITS_REG1; |
| 422 | break_reg[1] |= CH341_NBREAK_BITS_REG2; |
| 423 | } |
| 424 | dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x", |
| 425 | __func__, break_reg[0], break_reg[1]); |
Johan Hovold | 5be796f | 2009-12-31 16:47:59 +0100 | [diff] [blame] | 426 | reg_contents = get_unaligned_le16(break_reg); |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 427 | r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG, |
| 428 | ch341_break_reg, reg_contents); |
| 429 | if (r < 0) |
Johan Hovold | 6a9b15f | 2009-12-28 23:01:45 +0100 | [diff] [blame] | 430 | dev_err(&port->dev, "%s - USB control write error (%d)\n", |
| 431 | __func__, r); |
Johan Hovold | f2b5cc8 | 2009-12-28 23:01:46 +0100 | [diff] [blame] | 432 | out: |
| 433 | kfree(break_reg); |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 434 | } |
| 435 | |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 436 | static int ch341_tiocmset(struct tty_struct *tty, struct file *file, |
| 437 | unsigned int set, unsigned int clear) |
| 438 | { |
| 439 | struct usb_serial_port *port = tty->driver_data; |
| 440 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 441 | unsigned long flags; |
| 442 | u8 control; |
| 443 | |
| 444 | spin_lock_irqsave(&priv->lock, flags); |
| 445 | if (set & TIOCM_RTS) |
| 446 | priv->line_control |= CH341_BIT_RTS; |
| 447 | if (set & TIOCM_DTR) |
| 448 | priv->line_control |= CH341_BIT_DTR; |
| 449 | if (clear & TIOCM_RTS) |
| 450 | priv->line_control &= ~CH341_BIT_RTS; |
| 451 | if (clear & TIOCM_DTR) |
| 452 | priv->line_control &= ~CH341_BIT_DTR; |
| 453 | control = priv->line_control; |
| 454 | spin_unlock_irqrestore(&priv->lock, flags); |
| 455 | |
| 456 | return ch341_set_handshake(port->serial->dev, control); |
| 457 | } |
| 458 | |
| 459 | static void ch341_read_int_callback(struct urb *urb) |
| 460 | { |
| 461 | struct usb_serial_port *port = (struct usb_serial_port *) urb->context; |
| 462 | unsigned char *data = urb->transfer_buffer; |
| 463 | unsigned int actual_length = urb->actual_length; |
| 464 | int status; |
| 465 | |
| 466 | dbg("%s (%d)", __func__, port->number); |
| 467 | |
| 468 | switch (urb->status) { |
| 469 | case 0: |
| 470 | /* success */ |
| 471 | break; |
| 472 | case -ECONNRESET: |
| 473 | case -ENOENT: |
| 474 | case -ESHUTDOWN: |
| 475 | /* this urb is terminated, clean up */ |
| 476 | dbg("%s - urb shutting down with status: %d", __func__, |
| 477 | urb->status); |
| 478 | return; |
| 479 | default: |
| 480 | dbg("%s - nonzero urb status received: %d", __func__, |
| 481 | urb->status); |
| 482 | goto exit; |
| 483 | } |
| 484 | |
| 485 | usb_serial_debug_data(debug, &port->dev, __func__, |
| 486 | urb->actual_length, urb->transfer_buffer); |
| 487 | |
| 488 | if (actual_length >= 4) { |
| 489 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 490 | unsigned long flags; |
| 491 | |
| 492 | spin_lock_irqsave(&priv->lock, flags); |
| 493 | priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; |
| 494 | if ((data[1] & CH341_MULT_STAT)) |
| 495 | priv->multi_status_change = 1; |
| 496 | spin_unlock_irqrestore(&priv->lock, flags); |
| 497 | wake_up_interruptible(&priv->delta_msr_wait); |
| 498 | } |
| 499 | |
| 500 | exit: |
| 501 | status = usb_submit_urb(urb, GFP_ATOMIC); |
| 502 | if (status) |
| 503 | dev_err(&urb->dev->dev, |
| 504 | "%s - usb_submit_urb failed with result %d\n", |
| 505 | __func__, status); |
| 506 | } |
| 507 | |
| 508 | static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) |
| 509 | { |
| 510 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 511 | unsigned long flags; |
| 512 | u8 prevstatus; |
| 513 | u8 status; |
| 514 | u8 changed; |
| 515 | u8 multi_change = 0; |
| 516 | |
| 517 | spin_lock_irqsave(&priv->lock, flags); |
| 518 | prevstatus = priv->line_status; |
| 519 | priv->multi_status_change = 0; |
| 520 | spin_unlock_irqrestore(&priv->lock, flags); |
| 521 | |
| 522 | while (!multi_change) { |
| 523 | interruptible_sleep_on(&priv->delta_msr_wait); |
| 524 | /* see if a signal did it */ |
| 525 | if (signal_pending(current)) |
| 526 | return -ERESTARTSYS; |
| 527 | |
| 528 | spin_lock_irqsave(&priv->lock, flags); |
| 529 | status = priv->line_status; |
| 530 | multi_change = priv->multi_status_change; |
| 531 | spin_unlock_irqrestore(&priv->lock, flags); |
| 532 | |
| 533 | changed = prevstatus ^ status; |
| 534 | |
| 535 | if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || |
| 536 | ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || |
| 537 | ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || |
| 538 | ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) { |
| 539 | return 0; |
| 540 | } |
| 541 | prevstatus = status; |
| 542 | } |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | /*static int ch341_ioctl(struct usb_serial_port *port, struct file *file,*/ |
| 548 | static int ch341_ioctl(struct tty_struct *tty, struct file *file, |
| 549 | unsigned int cmd, unsigned long arg) |
| 550 | { |
| 551 | struct usb_serial_port *port = tty->driver_data; |
| 552 | dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd); |
| 553 | |
| 554 | switch (cmd) { |
| 555 | case TIOCMIWAIT: |
| 556 | dbg("%s (%d) TIOCMIWAIT", __func__, port->number); |
| 557 | return wait_modem_info(port, arg); |
| 558 | |
| 559 | default: |
| 560 | dbg("%s not supported = 0x%04x", __func__, cmd); |
| 561 | break; |
| 562 | } |
| 563 | |
| 564 | return -ENOIOCTLCMD; |
| 565 | } |
| 566 | |
| 567 | static int ch341_tiocmget(struct tty_struct *tty, struct file *file) |
| 568 | { |
| 569 | struct usb_serial_port *port = tty->driver_data; |
| 570 | struct ch341_private *priv = usb_get_serial_port_data(port); |
| 571 | unsigned long flags; |
| 572 | u8 mcr; |
| 573 | u8 status; |
| 574 | unsigned int result; |
| 575 | |
| 576 | dbg("%s (%d)", __func__, port->number); |
| 577 | |
| 578 | spin_lock_irqsave(&priv->lock, flags); |
| 579 | mcr = priv->line_control; |
| 580 | status = priv->line_status; |
| 581 | spin_unlock_irqrestore(&priv->lock, flags); |
| 582 | |
| 583 | result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) |
| 584 | | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) |
| 585 | | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) |
| 586 | | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) |
| 587 | | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) |
| 588 | | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); |
| 589 | |
| 590 | dbg("%s - result = %x", __func__, result); |
| 591 | |
| 592 | return result; |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 593 | } |
| 594 | |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 595 | |
| 596 | static int ch341_reset_resume(struct usb_interface *intf) |
| 597 | { |
| 598 | struct usb_device *dev = interface_to_usbdev(intf); |
| 599 | struct usb_serial *serial = NULL; |
| 600 | struct ch341_private *priv; |
| 601 | |
| 602 | serial = usb_get_intfdata(intf); |
| 603 | priv = usb_get_serial_port_data(serial->port[0]); |
| 604 | |
| 605 | /*reconfigure ch341 serial port after bus-reset*/ |
| 606 | ch341_configure(dev, priv); |
| 607 | |
| 608 | usb_serial_resume(intf); |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 613 | static struct usb_driver ch341_driver = { |
| 614 | .name = "ch341", |
| 615 | .probe = usb_serial_probe, |
| 616 | .disconnect = usb_serial_disconnect, |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 617 | .suspend = usb_serial_suspend, |
| 618 | .resume = usb_serial_resume, |
| 619 | .reset_resume = ch341_reset_resume, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 620 | .id_table = id_table, |
| 621 | .no_dynamic_id = 1, |
Ming Lei | 1ded7ea | 2009-02-20 21:23:09 +0800 | [diff] [blame] | 622 | .supports_autosuspend = 1, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 623 | }; |
| 624 | |
| 625 | static struct usb_serial_driver ch341_device = { |
| 626 | .driver = { |
| 627 | .owner = THIS_MODULE, |
| 628 | .name = "ch341-uart", |
| 629 | }, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 630 | .id_table = id_table, |
| 631 | .usb_driver = &ch341_driver, |
| 632 | .num_ports = 1, |
| 633 | .open = ch341_open, |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 634 | .dtr_rts = ch341_dtr_rts, |
| 635 | .carrier_raised = ch341_carrier_raised, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 636 | .close = ch341_close, |
| 637 | .ioctl = ch341_ioctl, |
| 638 | .set_termios = ch341_set_termios, |
Tim Small | 492896f | 2009-08-17 13:21:57 +0100 | [diff] [blame] | 639 | .break_ctl = ch341_break_ctl, |
Werner Cornelius | 664d5df | 2009-01-16 21:02:41 +0100 | [diff] [blame] | 640 | .tiocmget = ch341_tiocmget, |
| 641 | .tiocmset = ch341_tiocmset, |
| 642 | .read_int_callback = ch341_read_int_callback, |
| 643 | .attach = ch341_attach, |
Frank A Kingswood | 6ce7610 | 2007-08-22 20:48:58 +0100 | [diff] [blame] | 644 | }; |
| 645 | |
| 646 | static int __init ch341_init(void) |
| 647 | { |
| 648 | int retval; |
| 649 | |
| 650 | retval = usb_serial_register(&ch341_device); |
| 651 | if (retval) |
| 652 | return retval; |
| 653 | retval = usb_register(&ch341_driver); |
| 654 | if (retval) |
| 655 | usb_serial_deregister(&ch341_device); |
| 656 | return retval; |
| 657 | } |
| 658 | |
| 659 | static void __exit ch341_exit(void) |
| 660 | { |
| 661 | usb_deregister(&ch341_driver); |
| 662 | usb_serial_deregister(&ch341_device); |
| 663 | } |
| 664 | |
| 665 | module_init(ch341_init); |
| 666 | module_exit(ch341_exit); |
| 667 | MODULE_LICENSE("GPL"); |
| 668 | |
| 669 | module_param(debug, bool, S_IRUGO | S_IWUSR); |
| 670 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |
| 671 | |
| 672 | /* EOF ch341.c */ |