Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Input device TTY line discipline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 1999-2002 Vojtech Pavlik
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * This is a module that converts a tty line into a much simpler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * 'serial io port' abstraction that the input device drivers use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) MODULE_DESCRIPTION("Input device TTY line discipline");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) MODULE_ALIAS_LDISC(N_MOUSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define SERPORT_BUSY	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define SERPORT_ACTIVE	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define SERPORT_DEAD	3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) struct serport {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct tty_struct *tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct serio *serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct serio_device_id id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * Callback functions from the serio code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static int serport_serio_write(struct serio *serio, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct serport *serport = serio->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	return -(serport->tty->ops->write(serport->tty, &data, 1) != 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static int serport_serio_open(struct serio *serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct serport *serport = serio->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	spin_lock_irqsave(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	set_bit(SERPORT_ACTIVE, &serport->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	spin_unlock_irqrestore(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static void serport_serio_close(struct serio *serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct serport *serport = serio->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	spin_lock_irqsave(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	clear_bit(SERPORT_ACTIVE, &serport->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	spin_unlock_irqrestore(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * serport_ldisc_open() is the routine that is called upon setting our line
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * discipline on a tty. It prepares the serio struct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) static int serport_ldisc_open(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	struct serport *serport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	serport = kzalloc(sizeof(struct serport), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (!serport)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	serport->tty = tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	spin_lock_init(&serport->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	init_waitqueue_head(&serport->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	tty->disc_data = serport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	tty->receive_room = 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * serport_ldisc_close() is the opposite of serport_ldisc_open()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static void serport_ldisc_close(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct serport *serport = (struct serport *) tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	kfree(serport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  * serport_ldisc_receive() is called by the low level tty driver when characters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  * are ready for us. We forward the characters and flags, one by one to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)  * 'interrupt' routine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static void serport_ldisc_receive(struct tty_struct *tty, const unsigned char *cp, char *fp, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct serport *serport = (struct serport*) tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	unsigned int ch_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	spin_lock_irqsave(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if (!test_bit(SERPORT_ACTIVE, &serport->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	for (i = 0; i < count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (fp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			switch (fp[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			case TTY_FRAME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				ch_flags = SERIO_FRAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			case TTY_PARITY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 				ch_flags = SERIO_PARITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				ch_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		serio_interrupt(serport->serio, cp[i], ch_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	spin_unlock_irqrestore(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  * serport_ldisc_read() just waits indefinitely if everything goes well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * However, when the serio driver closes the serio port, it finishes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * returning 0 characters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 				  unsigned char *kbuf, size_t nr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				  void **cookie, unsigned long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	struct serport *serport = (struct serport*) tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct serio *serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (test_and_set_bit(SERPORT_BUSY, &serport->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	serport->serio = serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (!serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	strlcpy(serio->name, "Serial port", sizeof(serio->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", tty_name(tty));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	serio->id = serport->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	serio->id.type = SERIO_RS232;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	serio->write = serport_serio_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	serio->open = serport_serio_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	serio->close = serport_serio_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	serio->port_data = serport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	serio->dev.parent = tty->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	serio_register_port(serport->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	printk(KERN_INFO "serio: Serial port %s\n", tty_name(tty));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	wait_event_interruptible(serport->wait, test_bit(SERPORT_DEAD, &serport->flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	serio_unregister_port(serport->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	serport->serio = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	clear_bit(SERPORT_DEAD, &serport->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	clear_bit(SERPORT_BUSY, &serport->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static void serport_set_type(struct tty_struct *tty, unsigned long type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct serport *serport = tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	serport->id.proto = type & 0x000000ff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	serport->id.id    = (type & 0x0000ff00) >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	serport->id.extra = (type & 0x00ff0000) >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)  * serport_ldisc_ioctl() allows to set the port protocol, and device ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static int serport_ldisc_ioctl(struct tty_struct *tty, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			       unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (cmd == SPIOCSTYPE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		unsigned long type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		if (get_user(type, (unsigned long __user *) arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		serport_set_type(tty, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) #define COMPAT_SPIOCSTYPE	_IOW('q', 0x01, compat_ulong_t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static int serport_ldisc_compat_ioctl(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				       struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				       unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (cmd == COMPAT_SPIOCSTYPE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		void __user *uarg = compat_ptr(arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		compat_ulong_t compat_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		if (get_user(compat_type, (compat_ulong_t __user *)uarg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		serport_set_type(tty, compat_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static int serport_ldisc_hangup(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	struct serport *serport = (struct serport *) tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	spin_lock_irqsave(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	set_bit(SERPORT_DEAD, &serport->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	spin_unlock_irqrestore(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	wake_up_interruptible(&serport->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static void serport_ldisc_write_wakeup(struct tty_struct * tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct serport *serport = (struct serport *) tty->disc_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	spin_lock_irqsave(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (test_bit(SERPORT_ACTIVE, &serport->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		serio_drv_write_wakeup(serport->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	spin_unlock_irqrestore(&serport->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * The line discipline structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static struct tty_ldisc_ops serport_ldisc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	.owner =	THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	.name =		"input",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	.open =		serport_ldisc_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	.close =	serport_ldisc_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	.read =		serport_ldisc_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	.ioctl =	serport_ldisc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	.compat_ioctl =	serport_ldisc_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	.receive_buf =	serport_ldisc_receive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.hangup =	serport_ldisc_hangup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	.write_wakeup =	serport_ldisc_write_wakeup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  * The functions for insering/removing us as a module.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static int __init serport_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	retval = tty_register_ldisc(N_MOUSE, &serport_ldisc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		printk(KERN_ERR "serport.c: Error registering line discipline.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	return  retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static void __exit serport_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	tty_unregister_ldisc(N_MOUSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) module_init(serport_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) module_exit(serport_exit);