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 | */ |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 12 | |
| 13 | #include <linux/kernel.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 14 | #include <linux/errno.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 15 | #include <linux/module.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 16 | #include <linux/sched.h> |
| 17 | #include <linux/wait.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 18 | #include <linux/slab.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/mutex.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 21 | #include <linux/tty.h> |
| 22 | #include <linux/serial.h> |
| 23 | #include <linux/tty_driver.h> |
| 24 | #include <linux/tty_flip.h> |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 25 | #include <linux/serial.h> |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 26 | #include <linux/idr.h> |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 27 | #include <linux/fs.h> |
| 28 | #include <linux/kdev_t.h> |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 29 | #include "greybus.h" |
| 30 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 31 | #define GB_NUM_MINORS 255 /* 255 is enough for anyone... */ |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 32 | #define GB_NAME "ttyGB" |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 33 | |
| 34 | struct gb_tty { |
| 35 | struct tty_port port; |
| 36 | struct greybus_device *gdev; |
| 37 | int cport; |
| 38 | unsigned int minor; |
| 39 | unsigned char clocal; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 40 | unsigned int throttled:1; |
| 41 | unsigned int throttle_req:1; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 42 | bool disconnected; |
| 43 | int writesize; // FIXME - set this somehow. |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 44 | spinlock_t read_lock; |
| 45 | spinlock_t write_lock; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 46 | struct async_icount iocount; |
| 47 | struct async_icount oldcount; |
| 48 | wait_queue_head_t wioctl; |
| 49 | struct mutex mutex; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 50 | }; |
| 51 | |
Greg Kroah-Hartman | 6584c8a | 2014-09-01 13:31:31 -0700 | [diff] [blame] | 52 | static const struct greybus_module_id id_table[] = { |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 53 | { GREYBUS_DEVICE(0x45, 0x45) }, /* make shit up */ |
| 54 | { }, /* terminating NULL entry */ |
| 55 | }; |
| 56 | |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 57 | static struct tty_driver *gb_tty_driver; |
| 58 | static DEFINE_IDR(tty_minors); |
| 59 | static DEFINE_MUTEX(table_lock); |
| 60 | |
| 61 | static struct gb_tty *get_gb_by_minor(unsigned minor) |
| 62 | { |
| 63 | struct gb_tty *gb_tty; |
| 64 | |
| 65 | mutex_lock(&table_lock); |
| 66 | gb_tty = idr_find(&tty_minors, minor); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 67 | if (gb_tty) { |
| 68 | mutex_lock(&gb_tty->mutex); |
| 69 | if (gb_tty->disconnected) { |
| 70 | mutex_unlock(&gb_tty->mutex); |
| 71 | gb_tty = NULL; |
| 72 | } else { |
| 73 | tty_port_get(&gb_tty->port); |
| 74 | mutex_unlock(&gb_tty->mutex); |
| 75 | } |
| 76 | } |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 77 | mutex_unlock(&table_lock); |
| 78 | return gb_tty; |
| 79 | } |
| 80 | |
| 81 | static int alloc_minor(struct gb_tty *gb_tty) |
| 82 | { |
| 83 | int minor; |
| 84 | |
| 85 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 86 | 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] | 87 | mutex_unlock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 88 | if (minor >= 0) |
| 89 | gb_tty->minor = minor; |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 90 | return minor; |
| 91 | } |
| 92 | |
| 93 | static void release_minor(struct gb_tty *gb_tty) |
| 94 | { |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 95 | int minor = gb_tty->minor; |
| 96 | |
| 97 | gb_tty->minor = 0; /* Maybe should use an invalid value instead */ |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 98 | mutex_lock(&table_lock); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 99 | idr_remove(&tty_minors, minor); |
Greg Kroah-Hartman | ff45c26 | 2014-08-15 18:33:33 +0800 | [diff] [blame] | 100 | mutex_unlock(&table_lock); |
| 101 | } |
| 102 | |
| 103 | static int gb_tty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 104 | { |
| 105 | struct gb_tty *gb_tty; |
| 106 | int retval; |
| 107 | |
| 108 | gb_tty = get_gb_by_minor(tty->index); |
| 109 | if (!gb_tty) |
| 110 | return -ENODEV; |
| 111 | |
| 112 | retval = tty_standard_install(driver, tty); |
| 113 | if (retval) |
| 114 | goto error; |
| 115 | |
| 116 | tty->driver_data = gb_tty; |
| 117 | return 0; |
| 118 | error: |
| 119 | tty_port_put(&gb_tty->port); |
| 120 | return retval; |
| 121 | } |
| 122 | |
| 123 | static int gb_tty_open(struct tty_struct *tty, struct file *file) |
| 124 | { |
| 125 | struct gb_tty *gb_tty = tty->driver_data; |
| 126 | |
| 127 | return tty_port_open(&gb_tty->port, tty, file); |
| 128 | } |
| 129 | |
| 130 | static void gb_tty_close(struct tty_struct *tty, struct file *file) |
| 131 | { |
| 132 | struct gb_tty *gb_tty = tty->driver_data; |
| 133 | |
| 134 | tty_port_close(&gb_tty->port, tty, file); |
| 135 | } |
| 136 | |
| 137 | static void gb_tty_cleanup(struct tty_struct *tty) |
| 138 | { |
| 139 | struct gb_tty *gb_tty = tty->driver_data; |
| 140 | |
| 141 | tty_port_put(&gb_tty->port); |
| 142 | } |
| 143 | |
| 144 | static void gb_tty_hangup(struct tty_struct *tty) |
| 145 | { |
| 146 | struct gb_tty *gb_tty = tty->driver_data; |
| 147 | |
| 148 | tty_port_hangup(&gb_tty->port); |
| 149 | } |
| 150 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 151 | static int gb_tty_write(struct tty_struct *tty, const unsigned char *buf, |
| 152 | int count) |
| 153 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 154 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 155 | |
| 156 | // FIXME - actually implement... |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static int gb_tty_write_room(struct tty_struct *tty) |
| 162 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 163 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 164 | |
| 165 | // FIXME - how much do we want to say we have room for? |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int gb_tty_chars_in_buffer(struct tty_struct *tty) |
| 170 | { |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 171 | // struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 172 | |
| 173 | // FIXME - how many left to send? |
| 174 | return 0; |
| 175 | } |
| 176 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 177 | static int gb_tty_break_ctl(struct tty_struct *tty, int state) |
| 178 | { |
| 179 | // struct gb_tty *gb_tty = tty->driver_data; |
| 180 | |
| 181 | // FIXME - send a break, if asked to... |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static void gb_tty_set_termios(struct tty_struct *tty, struct ktermios *old) |
| 186 | { |
| 187 | // FIXME - is this it??? |
| 188 | tty_termios_copy_hw(&tty->termios, old); |
| 189 | } |
| 190 | |
| 191 | static int gb_tty_tiocmget(struct tty_struct *tty) |
| 192 | { |
| 193 | // struct gb_tty *gb_tty = tty->driver_data; |
| 194 | |
| 195 | // FIXME - get some tiocms! |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static int gb_tty_tiocmset(struct tty_struct *tty, unsigned int set, |
| 200 | unsigned int clear) |
| 201 | { |
| 202 | // struct gb_tty *gb_tty = tty->driver_data; |
| 203 | |
| 204 | // FIXME - set some tiocms! |
| 205 | return 0; |
| 206 | } |
| 207 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 208 | static void gb_tty_throttle(struct tty_struct *tty) |
| 209 | { |
| 210 | struct gb_tty *gb_tty = tty->driver_data; |
| 211 | |
| 212 | spin_lock_irq(&gb_tty->read_lock); |
| 213 | gb_tty->throttle_req = 1; |
| 214 | spin_unlock_irq(&gb_tty->read_lock); |
| 215 | } |
| 216 | |
| 217 | static void gb_tty_unthrottle(struct tty_struct *tty) |
| 218 | { |
| 219 | struct gb_tty *gb_tty = tty->driver_data; |
| 220 | unsigned int was_throttled; |
| 221 | |
| 222 | spin_lock_irq(&gb_tty->read_lock); |
| 223 | was_throttled = gb_tty->throttled; |
| 224 | gb_tty->throttle_req = 0; |
| 225 | gb_tty->throttled = 0; |
| 226 | spin_unlock_irq(&gb_tty->read_lock); |
| 227 | |
| 228 | if (was_throttled) { |
| 229 | // FIXME - send more data |
| 230 | } |
| 231 | } |
| 232 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 233 | static int get_serial_info(struct gb_tty *gb_tty, |
| 234 | struct serial_struct __user *info) |
| 235 | { |
| 236 | struct serial_struct tmp; |
| 237 | |
| 238 | if (!info) |
| 239 | return -EINVAL; |
| 240 | |
| 241 | memset(&tmp, 0, sizeof(tmp)); |
| 242 | tmp.flags = ASYNC_LOW_LATENCY; |
| 243 | tmp.xmit_fifo_size = gb_tty->writesize; |
| 244 | tmp.baud_base = 0; // FIXME |
| 245 | tmp.close_delay = gb_tty->port.close_delay / 10; |
| 246 | tmp.closing_wait = gb_tty->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 247 | ASYNC_CLOSING_WAIT_NONE : gb_tty->port.closing_wait / 10; |
| 248 | |
| 249 | if (copy_to_user(info, &tmp, sizeof(tmp))) |
| 250 | return -EFAULT; |
Greg Kroah-Hartman | 3be03d4 | 2014-09-01 19:10:06 -0700 | [diff] [blame] | 251 | return 0; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | static int set_serial_info(struct gb_tty *gb_tty, |
| 255 | struct serial_struct __user *newinfo) |
| 256 | { |
| 257 | struct serial_struct new_serial; |
| 258 | unsigned int closing_wait; |
| 259 | unsigned int close_delay; |
| 260 | int retval; |
| 261 | |
| 262 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 263 | return -EFAULT; |
| 264 | |
| 265 | close_delay = new_serial.close_delay * 10; |
| 266 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 267 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
| 268 | |
| 269 | mutex_lock(&gb_tty->port.mutex); |
| 270 | if (!capable(CAP_SYS_ADMIN)) { |
| 271 | if ((close_delay != gb_tty->port.close_delay) || |
| 272 | (closing_wait != gb_tty->port.closing_wait)) |
| 273 | retval = -EPERM; |
| 274 | else |
| 275 | retval = -EOPNOTSUPP; |
| 276 | } else { |
| 277 | gb_tty->port.close_delay = close_delay; |
| 278 | gb_tty->port.closing_wait = closing_wait; |
| 279 | } |
| 280 | mutex_unlock(&gb_tty->port.mutex); |
| 281 | return retval; |
| 282 | } |
| 283 | |
| 284 | static int wait_serial_change(struct gb_tty *gb_tty, unsigned long arg) |
| 285 | { |
| 286 | int retval = 0; |
| 287 | DECLARE_WAITQUEUE(wait, current); |
| 288 | struct async_icount old; |
| 289 | struct async_icount new; |
| 290 | |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 291 | if (!(arg & (TIOCM_DSR | TIOCM_RI | TIOCM_CD))) |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 292 | return -EINVAL; |
| 293 | |
| 294 | do { |
| 295 | spin_lock_irq(&gb_tty->read_lock); |
| 296 | old = gb_tty->oldcount; |
| 297 | new = gb_tty->iocount; |
| 298 | gb_tty->oldcount = new; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 299 | spin_unlock_irq(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 300 | |
| 301 | if ((arg & TIOCM_DSR) && (old.dsr != new.dsr)) |
| 302 | break; |
| 303 | if ((arg & TIOCM_CD) && (old.dcd != new.dcd)) |
| 304 | break; |
| 305 | if ((arg & TIOCM_RI) && (old.rng != new.rng)) |
| 306 | break; |
| 307 | |
| 308 | add_wait_queue(&gb_tty->wioctl, &wait); |
| 309 | set_current_state(TASK_INTERRUPTIBLE); |
| 310 | schedule(); |
| 311 | remove_wait_queue(&gb_tty->wioctl, &wait); |
| 312 | if (gb_tty->disconnected) { |
| 313 | if (arg & TIOCM_CD) |
| 314 | break; |
Alex Elder | caaa8a8 | 2014-08-18 18:25:12 -0500 | [diff] [blame] | 315 | retval = -ENODEV; |
| 316 | } else if (signal_pending(current)) { |
| 317 | retval = -ERESTARTSYS; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 318 | } |
| 319 | } while (!retval); |
| 320 | |
| 321 | return retval; |
| 322 | } |
| 323 | |
| 324 | static int get_serial_usage(struct gb_tty *gb_tty, |
| 325 | struct serial_icounter_struct __user *count) |
| 326 | { |
| 327 | struct serial_icounter_struct icount; |
| 328 | int retval = 0; |
| 329 | |
| 330 | memset(&icount, 0, sizeof(icount)); |
| 331 | icount.dsr = gb_tty->iocount.dsr; |
| 332 | icount.rng = gb_tty->iocount.rng; |
| 333 | icount.dcd = gb_tty->iocount.dcd; |
| 334 | icount.frame = gb_tty->iocount.frame; |
| 335 | icount.overrun = gb_tty->iocount.overrun; |
| 336 | icount.parity = gb_tty->iocount.parity; |
| 337 | icount.brk = gb_tty->iocount.brk; |
| 338 | |
| 339 | if (copy_to_user(count, &icount, sizeof(icount)) > 0) |
| 340 | retval = -EFAULT; |
| 341 | |
| 342 | return retval; |
| 343 | } |
| 344 | |
| 345 | static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 346 | unsigned long arg) |
| 347 | { |
| 348 | struct gb_tty *gb_tty = tty->driver_data; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 349 | |
| 350 | switch (cmd) { |
| 351 | case TIOCGSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 352 | return get_serial_info(gb_tty, |
| 353 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 354 | case TIOCSSERIAL: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 355 | return set_serial_info(gb_tty, |
| 356 | (struct serial_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 357 | case TIOCMIWAIT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 358 | return wait_serial_change(gb_tty, arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 359 | case TIOCGICOUNT: |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 360 | return get_serial_usage(gb_tty, |
| 361 | (struct serial_icounter_struct __user *)arg); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 362 | } |
| 363 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 364 | return -ENOIOCTLCMD; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 365 | } |
| 366 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 367 | |
| 368 | static const struct tty_operations gb_ops = { |
| 369 | .install = gb_tty_install, |
| 370 | .open = gb_tty_open, |
| 371 | .close = gb_tty_close, |
| 372 | .cleanup = gb_tty_cleanup, |
| 373 | .hangup = gb_tty_hangup, |
| 374 | .write = gb_tty_write, |
| 375 | .write_room = gb_tty_write_room, |
| 376 | .ioctl = gb_tty_ioctl, |
| 377 | .throttle = gb_tty_throttle, |
| 378 | .unthrottle = gb_tty_unthrottle, |
| 379 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 380 | .break_ctl = gb_tty_break_ctl, |
| 381 | .set_termios = gb_tty_set_termios, |
| 382 | .tiocmget = gb_tty_tiocmget, |
| 383 | .tiocmset = gb_tty_tiocmset, |
| 384 | }; |
| 385 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 386 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 387 | int gb_tty_probe(struct greybus_device *gdev, |
Greg Kroah-Hartman | 6584c8a | 2014-09-01 13:31:31 -0700 | [diff] [blame] | 388 | const struct greybus_module_id *id) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 389 | { |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 390 | struct gb_tty *gb_tty; |
| 391 | struct device *tty_dev; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 392 | int retval; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 393 | int minor; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 394 | |
Greg Kroah-Hartman | 8bf23e8 | 2014-08-30 17:18:04 -0700 | [diff] [blame] | 395 | gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 396 | if (!gb_tty) |
| 397 | return -ENOMEM; |
| 398 | |
| 399 | minor = alloc_minor(gb_tty); |
Alex Elder | ff5f0b3 | 2014-08-18 18:25:11 -0500 | [diff] [blame] | 400 | if (minor < 0) { |
| 401 | if (minor == -ENOSPC) { |
| 402 | dev_err(&gdev->dev, "no more free minor numbers\n"); |
| 403 | return -ENODEV; |
| 404 | } |
| 405 | return minor; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | gb_tty->minor = minor; |
| 409 | gb_tty->gdev = gdev; |
| 410 | spin_lock_init(&gb_tty->write_lock); |
| 411 | spin_lock_init(&gb_tty->read_lock); |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 412 | init_waitqueue_head(&gb_tty->wioctl); |
| 413 | mutex_init(&gb_tty->mutex); |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 414 | |
| 415 | /* FIXME - allocate gb buffers */ |
| 416 | |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame] | 417 | gdev->gb_tty = gb_tty; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 418 | |
| 419 | tty_dev = tty_port_register_device(&gb_tty->port, gb_tty_driver, minor, |
| 420 | &gdev->dev); |
| 421 | if (IS_ERR(tty_dev)) { |
| 422 | retval = PTR_ERR(tty_dev); |
| 423 | goto error; |
| 424 | } |
| 425 | |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 426 | return 0; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 427 | error: |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame] | 428 | gdev->gb_tty = NULL; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 429 | release_minor(gb_tty); |
| 430 | return retval; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 431 | } |
| 432 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 433 | void gb_tty_disconnect(struct greybus_device *gdev) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 434 | { |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame] | 435 | struct gb_tty *gb_tty = gdev->gb_tty; |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 436 | struct tty_struct *tty; |
| 437 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 438 | if (!gb_tty) |
| 439 | return; |
| 440 | |
| 441 | mutex_lock(&gb_tty->mutex); |
| 442 | gb_tty->disconnected = true; |
| 443 | |
| 444 | wake_up_all(&gb_tty->wioctl); |
Greg Kroah-Hartman | eca17c5 | 2014-08-30 16:54:05 -0700 | [diff] [blame] | 445 | gdev->gb_tty = NULL; |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 446 | mutex_unlock(&gb_tty->mutex); |
| 447 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 448 | tty = tty_port_tty_get(&gb_tty->port); |
| 449 | if (tty) { |
| 450 | tty_vhangup(tty); |
| 451 | tty_kref_put(tty); |
| 452 | } |
| 453 | /* FIXME - stop all traffic */ |
| 454 | |
| 455 | tty_unregister_device(gb_tty_driver, gb_tty->minor); |
| 456 | |
Greg Kroah-Hartman | e68453e | 2014-08-15 19:44:32 +0800 | [diff] [blame] | 457 | /* FIXME - free transmit / recieve buffers */ |
| 458 | |
Greg Kroah-Hartman | a18e151 | 2014-08-15 18:54:11 +0800 | [diff] [blame] | 459 | tty_port_put(&gb_tty->port); |
Greg Kroah-Hartman | e5f167f | 2014-08-30 17:11:41 -0700 | [diff] [blame] | 460 | |
| 461 | kfree(gb_tty); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 462 | } |
| 463 | |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 464 | #if 0 |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 465 | static struct greybus_driver tty_gb_driver = { |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 466 | .probe = gb_tty_probe, |
| 467 | .disconnect = gb_tty_disconnect, |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 468 | .id_table = id_table, |
| 469 | }; |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 470 | #endif |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 471 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 472 | int __init gb_tty_init(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 473 | { |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 474 | int retval = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 475 | |
Marti Bolivar | f8089c0 | 2014-09-05 23:56:09 -0400 | [diff] [blame] | 476 | gb_tty_driver = tty_alloc_driver(GB_NUM_MINORS, 0); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 477 | if (IS_ERR(gb_tty_driver)) { |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 478 | pr_err("Can not allocate tty driver\n"); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 479 | retval = -ENOMEM; |
| 480 | goto fail_unregister_dev; |
| 481 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 482 | |
| 483 | gb_tty_driver->driver_name = "gb"; |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 484 | gb_tty_driver->name = GB_NAME; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 485 | gb_tty_driver->major = 0; |
| 486 | gb_tty_driver->minor_start = 0; |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 487 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 488 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 489 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 490 | gb_tty_driver->init_termios = tty_std_termios; |
| 491 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 492 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 493 | |
| 494 | retval = tty_register_driver(gb_tty_driver); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 495 | if (retval) { |
| 496 | pr_err("Can not register tty driver: %d\n", retval); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 497 | goto fail_put_gb_tty; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 498 | } |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 499 | |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 500 | #if 0 |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 501 | retval = greybus_register(&tty_gb_driver); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 502 | if (retval) { |
| 503 | pr_err("Can not register greybus driver.\n"); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 504 | goto fail_unregister_gb_tty; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 505 | } |
| 506 | #endif |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 507 | |
| 508 | return 0; |
| 509 | |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 510 | /* fail_unregister_gb_tty: */ |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 511 | tty_unregister_driver(gb_tty_driver); |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 512 | fail_put_gb_tty: |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 513 | put_tty_driver(gb_tty_driver); |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 514 | fail_unregister_dev: |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 515 | return retval; |
| 516 | } |
| 517 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 518 | void __exit gb_tty_exit(void) |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 519 | { |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 520 | int major = MAJOR(gb_tty_driver->major); |
| 521 | int minor = gb_tty_driver->minor_start; |
Greg Kroah-Hartman | 543b8ed | 2014-09-13 17:02:47 -0700 | [diff] [blame] | 522 | |
| 523 | #if 0 |
| 524 | greybus_deregister(&tty_gb_driver); |
| 525 | #endif |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 526 | tty_unregister_driver(gb_tty_driver); |
| 527 | put_tty_driver(gb_tty_driver); |
Marti Bolivar | 7fabc88 | 2014-09-05 23:56:10 -0400 | [diff] [blame] | 528 | unregister_chrdev_region(MKDEV(major, minor), GB_NUM_MINORS); |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 529 | } |
| 530 | |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 531 | #if 0 |
Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame] | 532 | module_init(gb_tty_init); |
| 533 | module_exit(gb_tty_exit); |
| 534 | MODULE_LICENSE("GPL"); |
| 535 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 536 | #endif |