| Greg Kroah-Hartman | 79c822b | 2014-08-15 16:01:23 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * I2C bridge driver for the Greybus "generic" I2C module. |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * Released under the GPLv2 only. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/tty.h> |
| 13 | #include <linux/serial.h> |
| 14 | #include <linux/tty_driver.h> |
| 15 | #include <linux/tty_flip.h> |
| 16 | #include "greybus.h" |
| 17 | |
| 18 | #define GB_TTY_MAJOR 180 /* FIXME use a real number!!! */ |
| 19 | |
| 20 | struct gb_tty { |
| 21 | struct tty_port port; |
| 22 | struct greybus_device *gdev; |
| 23 | int cport; |
| 24 | unsigned int minor; |
| 25 | unsigned char clocal; |
| 26 | // FIXME locking!!! |
| 27 | }; |
| 28 | |
| 29 | static const struct greybus_device_id id_table[] = { |
| 30 | { GREYBUS_DEVICE(0x45, 0x45) }, /* make shit up */ |
| 31 | { }, /* terminating NULL entry */ |
| 32 | }; |
| 33 | |
| 34 | |
| 35 | static const struct tty_operations gb_ops = { |
| 36 | .install = gb_tty_install, |
| 37 | .open = gb_tty_open, |
| 38 | .close = gb_tty_close, |
| 39 | .cleanup = gb_tty_cleanup, |
| 40 | .hangup = gb_tty_hangup, |
| 41 | .write = gb_tty_write, |
| 42 | .write_room = gb_tty_write_room, |
| 43 | .ioctl = gb_tty_ioctl, |
| 44 | .throttle = gb_tty_throttle, |
| 45 | .unthrottle = gb_tty_unthrottle, |
| 46 | .chars_in_buffer = gb_tty_chars_in_buffer, |
| 47 | .break_ctl = gb_tty_break_ctl, |
| 48 | .set_termios = gb_tty_set_termios, |
| 49 | .tiocmget = gb_tty_tiocmget, |
| 50 | .tiocmset = gb_tty_tiocmset, |
| 51 | }; |
| 52 | |
| 53 | static struct tty_driver *gb_tty_driver; |
| 54 | static struct gb_tty *gb_tty_table[255]; |
| 55 | |
| 56 | static int tty_gb_probe(struct greybus_device *gdev, const struct greybus_device_id *id) |
| 57 | { |
| 58 | int retval; |
| 59 | |
| 60 | //greybus_set_drvdata(gdev, i2c_gb_data); |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | static void tty_gb_disconnect(struct greybus_device *gdev) |
| 65 | { |
| 66 | } |
| 67 | |
| 68 | static struct greybus_driver tty_gb_driver = { |
| 69 | .probe = tty_gb_probe, |
| 70 | .disconnect = tty_gb_disconnect, |
| 71 | .id_table = id_table, |
| 72 | }; |
| 73 | |
| 74 | |
| 75 | static int __init gb_tty_init(void) |
| 76 | { |
| 77 | int retval; |
| 78 | |
| 79 | gb_tty_driver = alloc_tty_driver(255); |
| 80 | if (!gb_tty_driver) |
| 81 | return -ENOMEM; |
| 82 | |
| 83 | gb_tty_driver->driver_name = "gb"; |
| 84 | gb_tty_driver->name = "ttyGB"; |
| 85 | gb_tty_driver->major = GB_TTY_MAJOR; |
| 86 | gb_tty_driver->minor_start = 0; |
| 87 | gb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 88 | gb_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 89 | gb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 90 | gb_tty_driver->init_termios = tty_std_termios; |
| 91 | gb_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 92 | tty_set_operations(gb_tty_driver, &gb_ops); |
| 93 | |
| 94 | retval = tty_register_driver(gb_tty_driver); |
| 95 | if (retval) { |
| 96 | put_tty_driver(gb_tty_driver); |
| 97 | return retval; |
| 98 | } |
| 99 | |
| 100 | retval = greybus_register(&tty_gb_driver); |
| 101 | if (retval) { |
| 102 | tty_unregister_driver(gb_tty_driver); |
| 103 | put_tty_driver(gb_tty_driver); |
| 104 | } |
| 105 | return retval; |
| 106 | } |
| 107 | |
| 108 | static void __exit gb_tty_exit(void) |
| 109 | { |
| 110 | greybus_deregister(&tty_gb_driver); |
| 111 | tty_unregister_driver(gb_tty_driver); |
| 112 | put_tty_driver(gb_tty_driver); |
| 113 | } |
| 114 | |
| 115 | module_init(gb_tty_init); |
| 116 | module_exit(gb_tty_exit); |
| 117 | MODULE_LICENSE("GPL"); |
| 118 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |