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)  * PS/2 driver library
^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)  * Copyright (c) 2004 Dmitry Torokhov
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/i8042.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/libps2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define DRIVER_DESC	"PS/2 driver library"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) MODULE_DESCRIPTION("PS/2 driver library");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static int ps2_do_sendbyte(struct ps2dev *ps2dev, u8 byte,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 			   unsigned int timeout, unsigned int max_attempts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	__releases(&ps2dev->serio->lock) __acquires(&ps2dev->serio->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	int attempt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	lockdep_assert_held(&ps2dev->serio->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		ps2dev->nak = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		ps2dev->flags |= PS2_FLAG_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		error = serio_write(ps2dev->serio, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			dev_dbg(&ps2dev->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 				"failed to write %#02x: %d\n", byte, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			wait_event_timeout(ps2dev->wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 					   !(ps2dev->flags & PS2_FLAG_ACK),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 					   msecs_to_jiffies(timeout));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	} while (ps2dev->nak == PS2_RET_NAK && ++attempt < max_attempts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	ps2dev->flags &= ~PS2_FLAG_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if (!error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		switch (ps2dev->nak) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		case PS2_RET_NAK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			error = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		case PS2_RET_ERR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			error = -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 			error = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (error || attempt > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		dev_dbg(&ps2dev->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			"%02x - %d (%x), attempt %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			byte, error, ps2dev->nak, attempt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	return error;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * ps2_sendbyte() sends a byte to the device and waits for acknowledge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * It doesn't handle retransmission, the caller is expected to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * it when needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * ps2_sendbyte() can only be called from a process context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	retval = ps2_do_sendbyte(ps2dev, byte, timeout, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	dev_dbg(&ps2dev->serio->dev, "%02x - %x\n", byte, ps2dev->nak);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) EXPORT_SYMBOL(ps2_sendbyte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) void ps2_begin_command(struct ps2dev *ps2dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	mutex_lock(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) EXPORT_SYMBOL(ps2_begin_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void ps2_end_command(struct ps2dev *ps2dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	mutex_unlock(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) EXPORT_SYMBOL(ps2_end_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * ps2_drain() waits for device to transmit requested number of bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * and discards them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (maxbytes > sizeof(ps2dev->cmdbuf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		maxbytes = sizeof(ps2dev->cmdbuf);
^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) 	ps2_begin_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	ps2dev->flags = PS2_FLAG_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	ps2dev->cmdcnt = maxbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	wait_event_timeout(ps2dev->wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			   !(ps2dev->flags & PS2_FLAG_CMD),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			   msecs_to_jiffies(timeout));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	ps2_end_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) EXPORT_SYMBOL(ps2_drain);
^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)  * ps2_is_keyboard_id() checks received ID byte against the list of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * known keyboard IDs.
^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) bool ps2_is_keyboard_id(u8 id_byte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	static const u8 keyboard_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		0xab,	/* Regular keyboards		*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		0xac,	/* NCD Sun keyboard		*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		0x2b,	/* Trust keyboard, translated	*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		0x5d,	/* Trust keyboard		*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		0x60,	/* NMB SGI keyboard, translated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		0x47,	/* NMB SGI keyboard		*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return memchr(keyboard_ids, id_byte, sizeof(keyboard_ids)) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) EXPORT_SYMBOL(ps2_is_keyboard_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  * ps2_adjust_timeout() is called after receiving 1st byte of command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  * response and tries to reduce remaining timeout to speed up command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * completion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static int ps2_adjust_timeout(struct ps2dev *ps2dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			      unsigned int command, unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	switch (command) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	case PS2_CMD_RESET_BAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		 * Device has sent the first response byte after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		 * reset command, reset is thus done, so we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		 * shorten the timeout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		 * The next byte will come soon (keyboard) or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		 * at all (mouse).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (timeout > msecs_to_jiffies(100))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			timeout = msecs_to_jiffies(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	case PS2_CMD_GETID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		 * Microsoft Natural Elite keyboard responds to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		 * the GET ID command as it were a mouse, with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		 * a single byte. Fail the command so atkbd will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		 * use alternative probe to detect it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		if (ps2dev->cmdbuf[1] == 0xaa) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 			ps2dev->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 			serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		 * If device behind the port is not a keyboard there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		 * won't be 2nd byte of ID response.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			ps2dev->flags = ps2dev->cmdcnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	return timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)  * ps2_command() sends a command and its parameters to the mouse,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)  * then waits for the response and puts it in the param array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)  * ps2_command() can only be called from a process context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	unsigned int timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	unsigned int send = (command >> 12) & 0xf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	unsigned int receive = (command >> 8) & 0xf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	u8 send_param[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (receive > sizeof(ps2dev->cmdbuf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (send && !param) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		WARN_ON(1);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	memcpy(send_param, param, send);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ps2dev->cmdcnt = receive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (receive && param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		for (i = 0; i < receive; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			ps2dev->cmdbuf[(receive - 1) - i] = param[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	/* Signal that we are sending the command byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ps2dev->flags |= PS2_FLAG_ACK_CMD;
^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) 	 * Some devices (Synaptics) peform the reset before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	 * ACKing the reset command, and so it can take a long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	 * time before the ACK arrives.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	timeout = command == PS2_CMD_RESET_BAT ? 1000 : 200;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	rc = ps2_do_sendbyte(ps2dev, command & 0xff, timeout, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		goto out_reset_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	/* Now we are sending command parameters, if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	ps2dev->flags &= ~PS2_FLAG_ACK_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	for (i = 0; i < send; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		rc = ps2_do_sendbyte(ps2dev, param[i], 200, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			goto out_reset_flags;
^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) 	serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	 * The reset command takes a long time to execute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	timeout = msecs_to_jiffies(command == PS2_CMD_RESET_BAT ? 4000 : 500);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	timeout = wait_event_timeout(ps2dev->wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 				     !(ps2dev->flags & PS2_FLAG_CMD1), timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (ps2dev->cmdcnt && !(ps2dev->flags & PS2_FLAG_CMD1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		timeout = ps2_adjust_timeout(ps2dev, command, timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		wait_event_timeout(ps2dev->wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 				   !(ps2dev->flags & PS2_FLAG_CMD), timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	serio_pause_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	if (param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		for (i = 0; i < receive; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			param[i] = ps2dev->cmdbuf[(receive - 1) - i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (ps2dev->cmdcnt &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	    (command != PS2_CMD_RESET_BAT || ps2dev->cmdcnt != 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		rc = -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		goto out_reset_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  out_reset_flags:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	ps2dev->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	serio_continue_rx(ps2dev->serio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	dev_dbg(&ps2dev->serio->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		"%02x [%*ph] - %x/%08lx [%*ph]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		command & 0xff, send, send_param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		ps2dev->nak, ps2dev->flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		receive, param ?: send_param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	 * ps_command() handles resends itself, so do not leak -EAGAIN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	 * to the callers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	return rc != -EAGAIN ? rc : -EPROTO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) EXPORT_SYMBOL(__ps2_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	ps2_begin_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	rc = __ps2_command(ps2dev, param, command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	ps2_end_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) EXPORT_SYMBOL(ps2_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)  * ps2_sliced_command() sends an extended PS/2 command to the mouse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)  * using sliced syntax, understood by advanced devices, such as Logitech
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  * or Synaptics touchpads. The command is encoded as:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)  * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)  * is the command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) int ps2_sliced_command(struct ps2dev *ps2dev, u8 command)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	ps2_begin_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	retval = __ps2_command(ps2dev, NULL, PS2_CMD_SETSCALE11);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	for (i = 6; i >= 0; i -= 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		u8 d = (command >> i) & 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		retval = __ps2_command(ps2dev, &d, PS2_CMD_SETRES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	dev_dbg(&ps2dev->serio->dev, "%02x - %d\n", command, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	ps2_end_command(ps2dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) EXPORT_SYMBOL(ps2_sliced_command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)  * ps2_init() initializes ps2dev structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) void ps2_init(struct ps2dev *ps2dev, struct serio *serio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	mutex_init(&ps2dev->cmd_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	lockdep_set_subclass(&ps2dev->cmd_mutex, serio->depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	init_waitqueue_head(&ps2dev->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	ps2dev->serio = serio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) EXPORT_SYMBOL(ps2_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)  * ps2_handle_ack() is supposed to be used in interrupt handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)  * to properly process ACK/NAK of a command from a PS/2 device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	switch (data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	case PS2_RET_ACK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		ps2dev->nak = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	case PS2_RET_NAK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		ps2dev->flags |= PS2_FLAG_NAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		ps2dev->nak = PS2_RET_NAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	case PS2_RET_ERR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		if (ps2dev->flags & PS2_FLAG_NAK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 			ps2dev->flags &= ~PS2_FLAG_NAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 			ps2dev->nak = PS2_RET_ERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		/* Fall through */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	 * Workaround for mice which don't ACK the Get ID command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	 * These are valid mouse IDs that we recognize.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	case 0x00:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	case 0x03:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	case 0x04:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		if (ps2dev->flags & PS2_FLAG_WAITID) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 			ps2dev->nak = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		 * Do not signal errors if we get unexpected reply while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 		 * waiting for an ACK to the initial (first) command byte:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		 * the device might not be quiesced yet and continue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 		 * delivering data.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 		 * Note that we reset PS2_FLAG_WAITID flag, so the workaround
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		 * for mice not acknowledging the Get ID command only triggers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		 * on the 1st byte; if device spews data we really want to see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		 * a real ACK from it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 		dev_dbg(&ps2dev->serio->dev, "unexpected %#02x\n", data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		ps2dev->flags &= ~PS2_FLAG_WAITID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		return ps2dev->flags & PS2_FLAG_ACK_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	if (!ps2dev->nak) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		ps2dev->flags &= ~PS2_FLAG_NAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		if (ps2dev->cmdcnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 			ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	ps2dev->flags &= ~PS2_FLAG_ACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 	wake_up(&ps2dev->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	if (data != PS2_RET_ACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		ps2_handle_response(ps2dev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) EXPORT_SYMBOL(ps2_handle_ack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)  * ps2_handle_response() is supposed to be used in interrupt handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)  * to properly store device's response to a command and notify process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)  * waiting for completion of the command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) bool ps2_handle_response(struct ps2dev *ps2dev, u8 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	if (ps2dev->cmdcnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 		ps2dev->cmdbuf[--ps2dev->cmdcnt] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	if (ps2dev->flags & PS2_FLAG_CMD1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 		ps2dev->flags &= ~PS2_FLAG_CMD1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 		if (ps2dev->cmdcnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 			wake_up(&ps2dev->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	if (!ps2dev->cmdcnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 		ps2dev->flags &= ~PS2_FLAG_CMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 		wake_up(&ps2dev->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) EXPORT_SYMBOL(ps2_handle_response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) void ps2_cmd_aborted(struct ps2dev *ps2dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	if (ps2dev->flags & PS2_FLAG_ACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 		ps2dev->nak = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	if (ps2dev->flags & (PS2_FLAG_ACK | PS2_FLAG_CMD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 		wake_up(&ps2dev->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 	/* reset all flags except last nack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 	ps2dev->flags &= PS2_FLAG_NAK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) EXPORT_SYMBOL(ps2_cmd_aborted);