Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 1 | /* |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 2 | * UART driver for the Greybus "generic" UART module. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * Released under the GPLv2 only. |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 7 | * |
| 8 | * Heavily based on drivers/usb/class/cdc-acm.c and |
| 9 | * drivers/usb/serial/usb-serial.c. |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 13 | #include <linux/errno.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 14 | #include <linux/module.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 15 | #include <linux/sched.h> |
| 16 | #include <linux/wait.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 17 | #include <linux/slab.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 18 | #include <linux/uaccess.h> |
| 19 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 20 | #include <linux/tty.h> |
| 21 | #include <linux/serial.h> |
| 22 | #include <linux/tty_driver.h> |
| 23 | #include <linux/tty_flip.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 24 | #include <linux/serial.h> |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 25 | #include <linux/idr.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 26 | #include "greybus.h" |
| 27 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 28 | #define GB_TTY_MAJOR 180 /* FIXME use a real number!!! */ |
| 29 | #define GB_NUM_MINORS 255 /* 255 is enough for anyone... */ |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 30 | |
| 31 | struct gb_tty { |
| 32 | struct tty_port port; |
| 33 | struct greybus_device *gdev; |
| 34 | int cport; |
| 35 | unsigned int minor; |
| 36 | unsigned char clocal; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 37 | unsigned int throttled:1; |
| 38 | unsigned int throttle_req:1; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 39 | bool disconnected; |
| 40 | int writesize; // FIXME - set this somehow. |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 41 | spinlock_t read_lock; |
| 42 | spinlock_t write_lock; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 43 | struct async_icount iocount; |
| 44 | struct async_icount oldcount; |
| 45 | wait_queue_head_t wioctl; |
| 46 | struct mutex mutex; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 47 | }; |
| 48 | |
| 49 | static const struct greybus_device_id id_table[] = { |
| 50 | { GREYBUS_DEVICE(0x45, 0x45) }, /* make shit up */ |
| 51 | { }, /* terminating NULL entry */ |
| 52 | }; |
| 53 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 54 | static struct tty_driver *gb_tty_driver; |
| 55 | static DEFINE_IDR(tty_minors); |
| 56 | static DEFINE_MUTEX(table_lock); |
| 57 | |
| 58 | static struct gb_tty *get_gb_by_minor(unsigned minor) |
| 59 | { |
| 60 | struct gb_tty *gb_tty; |
| 61 | |
| 62 | mutex_lock(&table_lock); |
| 63 | gb_tty = idr_find(&tty_minors, minor); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 64 | if (gb_tty) { |
| 65 | mutex_lock(&gb_tty->mutex); |
| 66 | if (gb_tty->disconnected) { |
| 67 | mutex_unlock(&gb_tty->mutex); |
| 68 | gb_tty = NULL; |
| 69 | } else { |
| 70 | tty_port_get(&gb_tty->port); |
| 71 | mutex_unlock(&gb_tty->mutex); |
| 72 | } |
| 73 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 74 | mutex_unlock(&table_lock); |
| 75 | return gb_tty; |
| 76 | } |
| 77 | |
| 78 | static int alloc_minor(struct gb_tty *gb_tty) |
| 79 | { |
| 80 | int minor; |
| 81 | |
| 82 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 83 | minor = idr_alloc(&tty_minors, gb_tty, 0, GB_NUM_MINORS, GFP_KERNEL); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 84 | mutex_unlock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 85 | if (minor >= 0) |
| 86 | gb_tty->minor = minor; |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 87 | return minor; |
| 88 | } |
| 89 | |
| 90 | static void release_minor(struct gb_tty *gb_tty) |
| 91 | { |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 92 | int minor = gb_tty->minor; |
| 93 | |
| 94 | gb_tty->minor = 0; /* Maybe should use an invalid value instead */ |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 95 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 96 | idr_remove(&tty_minors, minor); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 97 | mutex_unlock(&table_lock); |
| 98 | } |
| 99 | |
| 100 | static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 101 | { |
| 102 | struct gb_tty *gb_tty; |
| 103 | int retval; |
| 104 | |
| 105 | gb_tty = get_gb_by_minor(tty->index); |
| 106 | if (!gb_tty) |
| 107 | return -ENODEV; |
| 108 | |
| 109 | retval = tty_standard_install(driver, tty); |
| 110 | if (retval) |
| 111 | goto error; |
| 112 | |
| 113 | tty->driver_data = gb_tty; |
| 114 | return 0; |
| 115 | error: |
| 116 | tty_port_put(&gb_tty->port); |
| 117 | return retval; |
| 118 | } |
| 119 | |
| 120 | static int gb_tty_open(struct tty_struct *tty, struct file *file) |
| 121 | { |
| 122 | struct gb_tty *gb_tty = tty->driver_data; |
| 123 | |
| 124 | return tty_port_open(&gb_tty->port, tty, file); |
| 125 | } |
| 126 | |
| 127 | static void gb_tty_close(struct tty_struct *tty, struct file *file) |
| 128 | { |
| 129 | struct gb_tty *gb_tty = tty->driver_data; |
| 130 | |
| 131 | tty_port_close(&gb_tty->port, tty, file); |
| 132 | } |
| 133 | |
| 134 | static void gb_tty_cleanup(struct tty_struct *tty) |
| 135 | { |
| 136 | struct gb_tty *gb_tty = tty->driver_data; |
| 137 | |
| 138 | tty_port_put(&gb_tty->port); |
| 139 | } |
| 140 | |
| 141 | static void gb_tty_hangup(struct tty_struct *tty) |
| 142 | { |
| 143 | struct gb_tty *gb_tty = tty->driver_data; |
| 144 | |
| 145 | tty_port_hangup(&gb_tty->port); |
| 146 | } |
| 147 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 148 | static int gb_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| 149 | int count) |
| 150 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 151 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 152 | |
| 153 | // FIXME - actually implement... |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int gb_tty_write_room(struct tty_struct *tty) |
| 159 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 160 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 161 | |
| 162 | // FIXME - how much do we want to say we have room for? |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static int gb_tty_chars_in_buffer(struct tty_struct *tty) |
| 167 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 168 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 169 | |
| 170 | // FIXME - how many left to send? |
| 171 | return 0; |
| 172 | } |
| 173 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 174 | static int gb_tty_break_ctl(struct tty_struct *tty, int state) |
| 175 | { |
| 176 | // struct gb_tty *gb_tty = tty->driver_data; |
| 177 | |
| 178 | // FIXME - send a break, if asked to... |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static void gb_tty_set_termios(struct tty_struct *tty, struct ktermios *old) |
| 183 | { |
| 184 | // FIXME - is this it??? |
| 185 | tty_termios_copy_hw(&tty->termios, old); |
| 186 | } |
| 187 | |
| 188 | static int gb_tty_tiocmget(struct tty_struct *tty) |
| 189 | { |
| 190 | // struct gb_tty *gb_tty = tty->driver_data; |
| 191 | |
| 192 | // FIXME - get some tiocms! |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int gb_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| 197 | unsigned int clear) |
| 198 | { |
| 199 | // struct gb_tty *gb_tty = tty->driver_data; |
| 200 | |
| 201 | // FIXME - set some tiocms! |
| 202 | return 0; |
| 203 | } |
| 204 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 205 | static void gb_tty_throttle(struct tty_struct *tty) |
| 206 | { |
| 207 | struct gb_tty *gb_tty = tty->driver_data; |
| 208 | |
| 209 | spin_lock_irq(&gb_tty->read_lock); |
| 210 | gb_tty->throttle_req = 1; |
| 211 | spin_unlock_irq(&gb_tty->read_lock); |
| 212 | } |
| 213 | |
| 214 | static void gb_tty_unthrottle(struct tty_struct *tty) |
| 215 | { |
| 216 | struct gb_tty *gb_tty = tty->driver_data; |
| 217 | unsigned int was_throttled; |
| 218 | |
| 219 | spin_lock_irq(&gb_tty->read_lock); |
| 220 | was_throttled = gb_tty->throttled; |
| 221 | gb_tty->throttle_req = 0; |
| 222 | gb_tty->throttled = 0; |
| 223 | spin_unlock_irq(&gb_tty->read_lock); |
| 224 | |
| 225 | if (was_throttled) { |
| 226 | // FIXME - send more data |
| 227 | } |
| 228 | } |
| 229 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 230 | static int get_serial_info(struct gb_tty *gb_tty, |
| 231 | struct serial_struct __user *info) |
| 232 | { |
| 233 | struct serial_struct tmp; |
| 234 | |
| 235 | if (!info) |
| 236 | return -EINVAL; |
| 237 | |
| 238 | memset(&tmp, 0, sizeof(tmp)); |
| 239 | tmp.flags = ASYNC_LOW_LATENCY; |
| 240 | tmp.xmit_fifo_size = gb_tty->writesize; |
| 241 | tmp.baud_base = 0; // FIXME |
| 242 | tmp.close_delay = gb_tty->port.close_delay / 10; |
| 243 | tmp.closing_wait = gb_tty->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 244 | ASYNC_CLOSING_WAIT_NONE : gb_tty->port.closing_wait / 10; |
| 245 | |
| 246 | if (copy_to_user(info, &tmp, sizeof(tmp))) |
| 247 | return -EFAULT; |
| 248 | else |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static int set_serial_info(struct gb_tty *gb_tty, |
| 253 | struct serial_struct __user *newinfo) |
| 254 | { |
| 255 | struct serial_struct new_serial; |
| 256 | unsigned int closing_wait; |
| 257 | unsigned int close_delay; |
| 258 | int retval; |
| 259 | |
| 260 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 261 | return -EFAULT; |
| 262 | |
| 263 | close_delay = new_serial.close_delay * 10; |
| 264 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 265 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
| 266 | |
| 267 | mutex_lock(&gb_tty->port.mutex); |
| 268 | if (!capable(CAP_SYS_ADMIN)) { |
| 269 | if ((close_delay != gb_tty->port.close_delay) || |
| 270 | (closing_wait != gb_tty->port.closing_wait)) |
| 271 | retval = -EPERM; |
| 272 | else |
| 273 | retval = -EOPNOTSUPP; |
| 274 | } else { |
| 275 | gb_tty->port.close_delay = close_delay; |
| 276 | gb_tty->port.closing_wait = closing_wait; |
| 277 | } |
| 278 | mutex_unlock(&gb_tty->port.mutex); |
| 279 | return retval; |
| 280 | } |
| 281 | |
| 282 | static int wait_serial_change(struct gb_tty *gb_tty, unsigned long arg) |
| 283 | { |
| 284 | int retval = 0; |
| 285 | DECLARE_WAITQUEUE(wait, current); |
| 286 | struct async_icount old; |
| 287 | struct async_icount new; |
| 288 | |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 289 | if (!(arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 290 | return -EINVAL; |
| 291 | |
| 292 | do { |
| 293 | spin_lock_irq(&gb_tty->read_lock); |
| 294 | old = gb_tty->oldcount; |
| 295 | new = gb_tty->iocount; |
| 296 | gb_tty->oldcount = new; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 297 | spin_unlock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 298 | |
| 299 | if ((arg & TIOCM_DSR) && (old.dsr != new.dsr)) |
| 300 | break; |
| 301 | if ((arg & TIOCM_CD) && (old.dcd != new.dcd)) |
| 302 | break; |
| 303 | if ((arg & TIOCM_RI) && (old.rng != new.rng)) |
| 304 | break; |
| 305 | |
| 306 | add_wait_queue(&gb_tty->wioctl, &wait); |
| 307 | set_current_state(TASK_INTERRUPTIBLE); |
| 308 | schedule(); |
| 309 | remove_wait_queue(&gb_tty->wioctl, &wait); |
| 310 | if (gb_tty->disconnected) { |
| 311 | if (arg & TIOCM_CD) |
| 312 | break; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 313 | retval = -ENODEV; |
| 314 | } else if (signal_pending(current)) { |
| 315 | retval = -ERESTARTSYS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 316 | } |
| 317 | } while (!retval); |
| 318 | |
| 319 | return retval; |
| 320 | } |
| 321 | |
| 322 | static int get_serial_usage(struct gb_tty *gb_tty, |
| 323 | struct serial_icounter_struct __user *count) |
| 324 | { |
| 325 | struct serial_icounter_struct icount; |
| 326 | int retval = 0; |
| 327 | |
| 328 | memset(&icount, 0, sizeof(icount)); |
| 329 | icount.dsr = gb_tty->iocount.dsr; |
| 330 | icount.rng = gb_tty->iocount.rng; |
| 331 | icount.dcd = gb_tty->iocount.dcd; |
| 332 | icount.frame = gb_tty->iocount.frame; |
| 333 | icount.overrun = gb_tty->iocount.overrun; |
| 334 | icount.parity = gb_tty->iocount.parity; |
| 335 | icount.brk = gb_tty->iocount.brk; |
| 336 | |
| 337 | if (copy_to_user(count, &icount, sizeof(icount)) > 0) |
| 338 | retval = -EFAULT; |
| 339 | |
| 340 | return retval; |
| 341 | } |
| 342 | |
| 343 | static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 344 | unsigned long arg) |
| 345 | { |
| 346 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 347 | |
| 348 | switch (cmd) { |
| 349 | case TIOCGSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 350 | return get_serial_info(gb_tty, |
| 351 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 352 | case TIOCSSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 353 | return set_serial_info(gb_tty, |
| 354 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 355 | case TIOCMIWAIT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 356 | return wait_serial_change(gb_tty, arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 357 | case TIOCGICOUNT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 358 | return get_serial_usage(gb_tty, |
| 359 | (struct serial_icounter_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 360 | } |
| 361 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 362 | return -ENOIOCTLCMD; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 363 | } |
| 364 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 365 | |
| 366 | static const struct tty_operations gb_ops = { |
| 367 | .install = gb_tty_install, |
| 368 | .open = gb_tty_open, |
| 369 | .close = gb_tty_close, |
| 370 | .cleanup = gb_tty_cleanup, |
| 371 | .hangup = gb_tty_hangup, |
| 372 | .write = gb_tty_write, |
| 373 | .write_room = gb_tty_write_room, |
| 374 | .ioctl = gb_tty_ioctl, |
| 375 | .throttle = gb_tty_throttle, |
| 376 | .unthrottle = gb_tty_unthrottle, |
| 377 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 378 | .break_ctl = gb_tty_break_ctl, |
| 379 | .set_termios = gb_tty_set_termios, |
| 380 | .tiocmget = gb_tty_tiocmget, |
| 381 | .tiocmset = gb_tty_tiocmset, |
| 382 | }; |
| 383 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 384 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 385 | int gb_tty_probe(struct greybus_device *gdev, |
| 386 | const struct greybus_device_id *id) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 387 | { |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 388 | struct gb_tty *gb_tty; |
| 389 | struct device *tty_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 390 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 391 | int minor; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 392 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 393 | gb_tty = devm_kzalloc(&gdev->dev, sizeof(*gb_tty), GFP_KERNEL); |
| 394 | if (!gb_tty) |
| 395 | return -ENOMEM; |
| 396 | |
| 397 | minor = alloc_minor(gb_tty); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 398 | if (minor < 0) { |
| 399 | if (minor == -ENOSPC) { |
| 400 | dev_err(&gdev->dev, "no more free minor numbers\n"); |
| 401 | return -ENODEV; |
| 402 | } |
| 403 | return minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | gb_tty->minor = minor; |
| 407 | gb_tty->gdev = gdev; |
| 408 | spin_lock_init(&gb_tty->write_lock); |
| 409 | spin_lock_init(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 410 | init_waitqueue_head(&gb_tty->wioctl); |
| 411 | mutex_init(&gb_tty->mutex); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 412 | |
| 413 | /* FIXME - allocate gb buffers */ |
| 414 | |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame^] | 415 | gdev->gb_tty = gb_tty; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 416 | |
| 417 | tty_dev = tty_port_register_device(&gb_tty->port, gb_tty_driver, minor, |
| 418 | &gdev->dev); |
| 419 | if (IS_ERR(tty_dev)) { |
| 420 | retval = PTR_ERR(tty_dev); |
| 421 | goto error; |
| 422 | } |
| 423 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 424 | return 0; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 425 | error: |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame^] | 426 | gdev->gb_tty = NULL; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 427 | release_minor(gb_tty); |
| 428 | return retval; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 429 | } |
| 430 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 431 | void gb_tty_disconnect(struct greybus_device *gdev) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 432 | { |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame^] | 433 | struct gb_tty *gb_tty = gdev->gb_tty; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 434 | struct tty_struct *tty; |
| 435 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 436 | if (!gb_tty) |
| 437 | return; |
| 438 | |
| 439 | mutex_lock(&gb_tty->mutex); |
| 440 | gb_tty->disconnected = true; |
| 441 | |
| 442 | wake_up_all(&gb_tty->wioctl); |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame^] | 443 | gdev->gb_tty = NULL; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 444 | mutex_unlock(&gb_tty->mutex); |
| 445 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 446 | tty = tty_port_tty_get(&gb_tty->port); |
| 447 | if (tty) { |
| 448 | tty_vhangup(tty); |
| 449 | tty_kref_put(tty); |
| 450 | } |
| 451 | /* FIXME - stop all traffic */ |
| 452 | |
| 453 | tty_unregister_device(gb_tty_driver, gb_tty->minor); |
| 454 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 455 | /* FIXME - free transmit / recieve buffers */ |
| 456 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 457 | tty_port_put(&gb_tty->port); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | static struct greybus_driver tty_gb_driver = { |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 461 | .probe = gb_tty_probe, |
| 462 | .disconnect = gb_tty_disconnect, |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 463 | .id_table = id_table, |
| 464 | }; |
| 465 | |
| 466 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 467 | int __init gb_tty_init(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 468 | { |
| 469 | int retval; |
| 470 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 471 | gb_tty_driver = alloc_tty_driver(GB_NUM_MINORS); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 472 | if (!gb_tty_driver) |
| 473 | return -ENOMEM; |
| 474 | |
| 475 | gb_tty_driver->driver_name = "gb"; |
| 476 | gb_tty_driver->name = "ttyGB"; |
| 477 | gb_tty_driver->major = GB_TTY_MAJOR; |
| 478 | gb_tty_driver->minor_start = 0; |
| 479 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 480 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 481 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 482 | gb_tty_driver->init_termios = tty_std_termios; |
| 483 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 484 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 485 | |
| 486 | retval = tty_register_driver(gb_tty_driver); |
| 487 | if (retval) { |
| 488 | put_tty_driver(gb_tty_driver); |
| 489 | return retval; |
| 490 | } |
| 491 | |
| 492 | retval = greybus_register(&tty_gb_driver); |
| 493 | if (retval) { |
| 494 | tty_unregister_driver(gb_tty_driver); |
| 495 | put_tty_driver(gb_tty_driver); |
| 496 | } |
| 497 | return retval; |
| 498 | } |
| 499 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 500 | void __exit gb_tty_exit(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 501 | { |
| 502 | greybus_deregister(&tty_gb_driver); |
| 503 | tty_unregister_driver(gb_tty_driver); |
| 504 | put_tty_driver(gb_tty_driver); |
| 505 | } |
| 506 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 507 | #if 0 |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 508 | module_init(gb_tty_init); |
| 509 | module_exit(gb_tty_exit); |
| 510 | MODULE_LICENSE("GPL"); |
| 511 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 512 | #endif |