^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/alpha/kernel/srmcons.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Callback based driver for SRM Console console device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * (TTY driver and console driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/tty_driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/tty_flip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_SPINLOCK(srmcons_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int srm_is_registered_console = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * The TTY driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define MAX_SRM_CONSOLE_DEVICES 1 /* only support 1 console device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct srmcons_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct tty_port port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) } srmcons_singleton;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) typedef union _srmcons_result {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned long c :61;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long status :3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) } bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) long as_long;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) } srmcons_result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /* called with callback_lock held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) srmcons_do_receive_chars(struct tty_port *port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) srmcons_result result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int count = 0, loops = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) result.as_long = callback_getc(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (result.bits.status < 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) tty_insert_flip_char(port, (char)result.bits.c, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) } while((result.bits.status & 1) && (++loops < 10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) tty_schedule_flip(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) srmcons_receive_chars(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct srmcons_private *srmconsp = from_timer(srmconsp, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct tty_port *port = &srmconsp->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int incr = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (spin_trylock(&srmcons_callback_lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!srmcons_do_receive_chars(port))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) incr = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) spin_unlock(&srmcons_callback_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) spin_lock(&port->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (port->tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mod_timer(&srmconsp->timer, jiffies + incr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) spin_unlock(&port->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* called with callback_lock held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) srmcons_do_write(struct tty_port *port, const char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static char str_cr[1] = "\r";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) long c, remaining = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) srmcons_result result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) char *cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int need_cr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) for (cur = (char *)buf; remaining > 0; ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) need_cr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * Break it up into reasonable size chunks to allow a chance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * for input to get in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) for (c = 0; c < min_t(long, 128L, remaining) && !need_cr; c++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (cur[c] == '\n')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) need_cr = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) while (c > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) result.as_long = callback_puts(0, cur, c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) c -= result.bits.c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) remaining -= result.bits.c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) cur += result.bits.c;
^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) * Check for pending input iff a tty port was provided
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) srmcons_do_receive_chars(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) while (need_cr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) result.as_long = callback_puts(0, str_cr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (result.bits.c > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) need_cr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) srmcons_write(struct tty_struct *tty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) const unsigned char *buf, int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) spin_lock_irqsave(&srmcons_callback_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) srmcons_do_write(tty->port, (const char *) buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) spin_unlock_irqrestore(&srmcons_callback_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return count;
^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) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) srmcons_write_room(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return 512;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) srmcons_chars_in_buffer(struct tty_struct *tty)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) srmcons_open(struct tty_struct *tty, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct srmcons_private *srmconsp = &srmcons_singleton;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct tty_port *port = &srmconsp->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) spin_lock_irqsave(&port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!port->tty) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) tty->driver_data = srmconsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) tty->port = port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) port->tty = tty; /* XXX proper refcounting */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) mod_timer(&srmconsp->timer, jiffies + 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) spin_unlock_irqrestore(&port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) srmcons_close(struct tty_struct *tty, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct srmcons_private *srmconsp = tty->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct tty_port *port = &srmconsp->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) spin_lock_irqsave(&port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (tty->count == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) port->tty = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) del_timer(&srmconsp->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) spin_unlock_irqrestore(&port->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^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 struct tty_driver *srmcons_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static const struct tty_operations srmcons_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .open = srmcons_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) .close = srmcons_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .write = srmcons_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) .write_room = srmcons_write_room,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) .chars_in_buffer= srmcons_chars_in_buffer,
^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) static int __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) srmcons_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) timer_setup(&srmcons_singleton.timer, srmcons_receive_chars, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (srm_is_registered_console) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct tty_driver *driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) driver = alloc_tty_driver(MAX_SRM_CONSOLE_DEVICES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (!driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) tty_port_init(&srmcons_singleton.port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) driver->driver_name = "srm";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) driver->name = "srm";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) driver->major = 0; /* dynamic */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) driver->minor_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) driver->type = TTY_DRIVER_TYPE_SYSTEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) driver->subtype = SYSTEM_TYPE_SYSCONS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) driver->init_termios = tty_std_termios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) tty_set_operations(driver, &srmcons_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) tty_port_link_device(&srmcons_singleton.port, driver, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) err = tty_register_driver(driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) put_tty_driver(driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) tty_port_destroy(&srmcons_singleton.port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) srmcons_driver = driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) device_initcall(srmcons_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * The console driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) srm_console_write(struct console *co, const char *s, unsigned count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^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(&srmcons_callback_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) srmcons_do_write(NULL, s, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) spin_unlock_irqrestore(&srmcons_callback_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static struct tty_driver *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) srm_console_device(struct console *co, int *index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *index = co->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return srmcons_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) srm_console_setup(struct console *co, char *options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static struct console srmcons = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) .name = "srm",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .write = srm_console_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .device = srm_console_device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) .setup = srm_console_setup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) .flags = CON_PRINTBUFFER | CON_BOOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) .index = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) register_srm_console(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (!srm_is_registered_console) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) callback_open_console();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) register_console(&srmcons);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) srm_is_registered_console = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) void __init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) unregister_srm_console(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (srm_is_registered_console) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) callback_close_console();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) unregister_console(&srmcons);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) srm_is_registered_console = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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