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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/input/serio/libps2.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/serio/libps2.c')
-rw-r--r--drivers/input/serio/libps2.c623
1 files changed, 623 insertions, 0 deletions
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
new file mode 100644
index 0000000000..6d78a1fe00
--- /dev/null
+++ b/drivers/input/serio/libps2.c
@@ -0,0 +1,623 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PS/2 driver library
+ *
+ * Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 2004 Dmitry Torokhov
+ */
+
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/kmsan-checks.h>
+#include <linux/serio.h>
+#include <linux/i8042.h>
+#include <linux/libps2.h>
+
+#define DRIVER_DESC "PS/2 driver library"
+
+#define PS2_CMD_SETSCALE11 0x00e6
+#define PS2_CMD_SETRES 0x10e8
+#define PS2_CMD_EX_SETLEDS 0x20eb
+#define PS2_CMD_SETLEDS 0x10ed
+#define PS2_CMD_GETID 0x02f2
+#define PS2_CMD_SETREP 0x10f3 /* Set repeat rate/set report rate */
+#define PS2_CMD_RESET_BAT 0x02ff
+
+#define PS2_RET_BAT 0xaa
+#define PS2_RET_ID 0x00
+#define PS2_RET_ACK 0xfa
+#define PS2_RET_NAK 0xfe
+#define PS2_RET_ERR 0xfc
+
+#define PS2_FLAG_ACK BIT(0) /* Waiting for ACK/NAK */
+#define PS2_FLAG_CMD BIT(1) /* Waiting for a command to finish */
+#define PS2_FLAG_CMD1 BIT(2) /* Waiting for the first byte of command response */
+#define PS2_FLAG_WAITID BIT(3) /* Command executing is GET ID */
+#define PS2_FLAG_NAK BIT(4) /* Last transmission was NAKed */
+#define PS2_FLAG_PASS_NOACK BIT(5) /* Pass non-ACK byte to receive handler */
+
+static int ps2_do_sendbyte(struct ps2dev *ps2dev, u8 byte,
+ unsigned int timeout, unsigned int max_attempts)
+ __releases(&ps2dev->serio->lock) __acquires(&ps2dev->serio->lock)
+{
+ int attempt = 0;
+ int error;
+
+ lockdep_assert_held(&ps2dev->serio->lock);
+
+ do {
+ ps2dev->nak = 1;
+ ps2dev->flags |= PS2_FLAG_ACK;
+
+ serio_continue_rx(ps2dev->serio);
+
+ error = serio_write(ps2dev->serio, byte);
+ if (error)
+ dev_dbg(&ps2dev->serio->dev,
+ "failed to write %#02x: %d\n", byte, error);
+ else
+ wait_event_timeout(ps2dev->wait,
+ !(ps2dev->flags & PS2_FLAG_ACK),
+ msecs_to_jiffies(timeout));
+
+ serio_pause_rx(ps2dev->serio);
+ } while (ps2dev->nak == PS2_RET_NAK && ++attempt < max_attempts);
+
+ ps2dev->flags &= ~PS2_FLAG_ACK;
+
+ if (!error) {
+ switch (ps2dev->nak) {
+ case 0:
+ break;
+ case PS2_RET_NAK:
+ error = -EAGAIN;
+ break;
+ case PS2_RET_ERR:
+ error = -EPROTO;
+ break;
+ default:
+ error = -EIO;
+ break;
+ }
+ }
+
+ if (error || attempt > 1)
+ dev_dbg(&ps2dev->serio->dev,
+ "%02x - %d (%x), attempt %d\n",
+ byte, error, ps2dev->nak, attempt);
+
+ return error;
+}
+
+/**
+ * ps2_sendbyte - sends a byte to the device and wait for acknowledgement
+ * @ps2dev: a PS/2 device to send the data to
+ * @byte: data to be sent to the device
+ * @timeout: timeout for sending the data and receiving an acknowledge
+ *
+ * The function doesn't handle retransmission, the caller is expected to handle
+ * it when needed.
+ *
+ * ps2_sendbyte() can only be called from a process context.
+ */
+int ps2_sendbyte(struct ps2dev *ps2dev, u8 byte, unsigned int timeout)
+{
+ int retval;
+
+ serio_pause_rx(ps2dev->serio);
+
+ retval = ps2_do_sendbyte(ps2dev, byte, timeout, 1);
+ dev_dbg(&ps2dev->serio->dev, "%02x - %x\n", byte, ps2dev->nak);
+
+ serio_continue_rx(ps2dev->serio);
+
+ return retval;
+}
+EXPORT_SYMBOL(ps2_sendbyte);
+
+/**
+ * ps2_begin_command - mark beginning of execution of a complex command
+ * @ps2dev: a PS/2 device executing the command
+ *
+ * Serializes a complex/compound command. Once command is finished
+ * ps2_end_command() should be called.
+ */
+void ps2_begin_command(struct ps2dev *ps2dev)
+{
+ struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
+
+ mutex_lock(m);
+}
+EXPORT_SYMBOL(ps2_begin_command);
+
+/**
+ * ps2_end_command - mark end of execution of a complex command
+ * @ps2dev: a PS/2 device executing the command
+ */
+void ps2_end_command(struct ps2dev *ps2dev)
+{
+ struct mutex *m = ps2dev->serio->ps2_cmd_mutex ?: &ps2dev->cmd_mutex;
+
+ mutex_unlock(m);
+}
+EXPORT_SYMBOL(ps2_end_command);
+
+/**
+ * ps2_drain - waits for device to transmit requested number of bytes
+ * and discards them
+ * @ps2dev: the PS/2 device that should be drained
+ * @maxbytes: maximum number of bytes to be drained
+ * @timeout: time to drain the device
+ */
+void ps2_drain(struct ps2dev *ps2dev, size_t maxbytes, unsigned int timeout)
+{
+ if (maxbytes > sizeof(ps2dev->cmdbuf)) {
+ WARN_ON(1);
+ maxbytes = sizeof(ps2dev->cmdbuf);
+ }
+
+ ps2_begin_command(ps2dev);
+
+ serio_pause_rx(ps2dev->serio);
+ ps2dev->flags = PS2_FLAG_CMD;
+ ps2dev->cmdcnt = maxbytes;
+ serio_continue_rx(ps2dev->serio);
+
+ wait_event_timeout(ps2dev->wait,
+ !(ps2dev->flags & PS2_FLAG_CMD),
+ msecs_to_jiffies(timeout));
+
+ ps2_end_command(ps2dev);
+}
+EXPORT_SYMBOL(ps2_drain);
+
+/**
+ * ps2_is_keyboard_id - checks received ID byte against the list of
+ * known keyboard IDs
+ * @id_byte: data byte that should be checked
+ */
+bool ps2_is_keyboard_id(u8 id_byte)
+{
+ static const u8 keyboard_ids[] = {
+ 0xab, /* Regular keyboards */
+ 0xac, /* NCD Sun keyboard */
+ 0x2b, /* Trust keyboard, translated */
+ 0x5d, /* Trust keyboard */
+ 0x60, /* NMB SGI keyboard, translated */
+ 0x47, /* NMB SGI keyboard */
+ };
+
+ return memchr(keyboard_ids, id_byte, sizeof(keyboard_ids)) != NULL;
+}
+EXPORT_SYMBOL(ps2_is_keyboard_id);
+
+/*
+ * ps2_adjust_timeout() is called after receiving 1st byte of command
+ * response and tries to reduce remaining timeout to speed up command
+ * completion.
+ */
+static int ps2_adjust_timeout(struct ps2dev *ps2dev,
+ unsigned int command, unsigned int timeout)
+{
+ switch (command) {
+ case PS2_CMD_RESET_BAT:
+ /*
+ * Device has sent the first response byte after
+ * reset command, reset is thus done, so we can
+ * shorten the timeout.
+ * The next byte will come soon (keyboard) or not
+ * at all (mouse).
+ */
+ if (timeout > msecs_to_jiffies(100))
+ timeout = msecs_to_jiffies(100);
+ break;
+
+ case PS2_CMD_GETID:
+ /*
+ * Microsoft Natural Elite keyboard responds to
+ * the GET ID command as it were a mouse, with
+ * a single byte. Fail the command so atkbd will
+ * use alternative probe to detect it.
+ */
+ if (ps2dev->cmdbuf[1] == 0xaa) {
+ serio_pause_rx(ps2dev->serio);
+ ps2dev->flags = 0;
+ serio_continue_rx(ps2dev->serio);
+ timeout = 0;
+ }
+
+ /*
+ * If device behind the port is not a keyboard there
+ * won't be 2nd byte of ID response.
+ */
+ if (!ps2_is_keyboard_id(ps2dev->cmdbuf[1])) {
+ serio_pause_rx(ps2dev->serio);
+ ps2dev->flags = ps2dev->cmdcnt = 0;
+ serio_continue_rx(ps2dev->serio);
+ timeout = 0;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return timeout;
+}
+
+/**
+ * __ps2_command - send a command to PS/2 device
+ * @ps2dev: the PS/2 device that should execute the command
+ * @param: a buffer containing parameters to be sent along with the command,
+ * or place where the results of the command execution will be deposited,
+ * or both
+ * @command: command word that encodes the command itself, as well as number of
+ * additional parameter bytes that should be sent to the device and expected
+ * length of the command response
+ *
+ * Not serialized. Callers should use ps2_begin_command() and ps2_end_command()
+ * to ensure proper serialization for complex commands.
+ */
+int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
+{
+ unsigned int timeout;
+ unsigned int send = (command >> 12) & 0xf;
+ unsigned int receive = (command >> 8) & 0xf;
+ int rc;
+ int i;
+ u8 send_param[16];
+
+ if (receive > sizeof(ps2dev->cmdbuf)) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ if (send && !param) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ memcpy(send_param, param, send);
+
+ serio_pause_rx(ps2dev->serio);
+
+ ps2dev->cmdcnt = receive;
+
+ switch (command) {
+ case PS2_CMD_GETID:
+ /*
+ * Some mice do not ACK the "get ID" command, prepare to
+ * handle this.
+ */
+ ps2dev->flags = PS2_FLAG_WAITID;
+ break;
+
+ case PS2_CMD_SETLEDS:
+ case PS2_CMD_EX_SETLEDS:
+ case PS2_CMD_SETREP:
+ ps2dev->flags = PS2_FLAG_PASS_NOACK;
+ break;
+
+ default:
+ ps2dev->flags = 0;
+ break;
+ }
+
+ if (receive) {
+ /* Indicate that we expect response to the command. */
+ ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1;
+ if (param)
+ for (i = 0; i < receive; i++)
+ ps2dev->cmdbuf[(receive - 1) - i] = param[i];
+ }
+
+ /*
+ * Some devices (Synaptics) perform the reset before
+ * ACKing the reset command, and so it can take a long
+ * time before the ACK arrives.
+ */
+ timeout = command == PS2_CMD_RESET_BAT ? 1000 : 200;
+
+ rc = ps2_do_sendbyte(ps2dev, command & 0xff, timeout, 2);
+ if (rc)
+ goto out_reset_flags;
+
+ /* Send command parameters, if any. */
+ for (i = 0; i < send; i++) {
+ rc = ps2_do_sendbyte(ps2dev, param[i], 200, 2);
+ if (rc)
+ goto out_reset_flags;
+ }
+
+ serio_continue_rx(ps2dev->serio);
+
+ /*
+ * The reset command takes a long time to execute.
+ */
+ timeout = msecs_to_jiffies(command == PS2_CMD_RESET_BAT ? 4000 : 500);
+
+ timeout = wait_event_timeout(ps2dev->wait,
+ !(ps2dev->flags & PS2_FLAG_CMD1), timeout);
+
+ if (ps2dev->cmdcnt && !(ps2dev->flags & PS2_FLAG_CMD1)) {
+
+ timeout = ps2_adjust_timeout(ps2dev, command, timeout);
+ wait_event_timeout(ps2dev->wait,
+ !(ps2dev->flags & PS2_FLAG_CMD), timeout);
+ }
+
+ serio_pause_rx(ps2dev->serio);
+
+ if (param) {
+ for (i = 0; i < receive; i++)
+ param[i] = ps2dev->cmdbuf[(receive - 1) - i];
+ kmsan_unpoison_memory(param, receive);
+ }
+
+ if (ps2dev->cmdcnt &&
+ (command != PS2_CMD_RESET_BAT || ps2dev->cmdcnt != 1)) {
+ rc = -EPROTO;
+ goto out_reset_flags;
+ }
+
+ rc = 0;
+
+ out_reset_flags:
+ ps2dev->flags = 0;
+ serio_continue_rx(ps2dev->serio);
+
+ dev_dbg(&ps2dev->serio->dev,
+ "%02x [%*ph] - %x/%08lx [%*ph]\n",
+ command & 0xff, send, send_param,
+ ps2dev->nak, ps2dev->flags,
+ receive, param ?: send_param);
+
+ /*
+ * ps_command() handles resends itself, so do not leak -EAGAIN
+ * to the callers.
+ */
+ return rc != -EAGAIN ? rc : -EPROTO;
+}
+EXPORT_SYMBOL(__ps2_command);
+
+/**
+ * ps2_command - send a command to PS/2 device
+ * @ps2dev: the PS/2 device that should execute the command
+ * @param: a buffer containing parameters to be sent along with the command,
+ * or place where the results of the command execution will be deposited,
+ * or both
+ * @command: command word that encodes the command itself, as well as number of
+ * additional parameter bytes that should be sent to the device and expected
+ * length of the command response
+ *
+ * Note: ps2_command() serializes the command execution so that only one
+ * command can be executed at a time for either individual port or the entire
+ * 8042 controller.
+ */
+int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command)
+{
+ int rc;
+
+ ps2_begin_command(ps2dev);
+ rc = __ps2_command(ps2dev, param, command);
+ ps2_end_command(ps2dev);
+
+ return rc;
+}
+EXPORT_SYMBOL(ps2_command);
+
+/**
+ * ps2_sliced_command - sends an extended PS/2 command to a mouse
+ * @ps2dev: the PS/2 device that should execute the command
+ * @command: command byte
+ *
+ * The command is sent using "sliced" syntax understood by advanced devices,
+ * such as Logitech or Synaptics touchpads. The command is encoded as:
+ * 0xE6 0xE8 rr 0xE8 ss 0xE8 tt 0xE8 uu where (rr*64)+(ss*16)+(tt*4)+uu
+ * is the command.
+ */
+int ps2_sliced_command(struct ps2dev *ps2dev, u8 command)
+{
+ int i;
+ int retval;
+
+ ps2_begin_command(ps2dev);
+
+ retval = __ps2_command(ps2dev, NULL, PS2_CMD_SETSCALE11);
+ if (retval)
+ goto out;
+
+ for (i = 6; i >= 0; i -= 2) {
+ u8 d = (command >> i) & 3;
+ retval = __ps2_command(ps2dev, &d, PS2_CMD_SETRES);
+ if (retval)
+ break;
+ }
+
+out:
+ dev_dbg(&ps2dev->serio->dev, "%02x - %d\n", command, retval);
+ ps2_end_command(ps2dev);
+ return retval;
+}
+EXPORT_SYMBOL(ps2_sliced_command);
+
+/**
+ * ps2_init - initializes ps2dev structure
+ * @ps2dev: structure to be initialized
+ * @serio: serio port associated with the PS/2 device
+ * @pre_receive_handler: validation handler to check basic communication state
+ * @receive_handler: main protocol handler
+ *
+ * Prepares ps2dev structure for use in drivers for PS/2 devices.
+ */
+void ps2_init(struct ps2dev *ps2dev, struct serio *serio,
+ ps2_pre_receive_handler_t pre_receive_handler,
+ ps2_receive_handler_t receive_handler)
+{
+ ps2dev->pre_receive_handler = pre_receive_handler;
+ ps2dev->receive_handler = receive_handler;
+
+ mutex_init(&ps2dev->cmd_mutex);
+ lockdep_set_subclass(&ps2dev->cmd_mutex, serio->depth);
+ init_waitqueue_head(&ps2dev->wait);
+ ps2dev->serio = serio;
+ serio_set_drvdata(serio, ps2dev);
+}
+EXPORT_SYMBOL(ps2_init);
+
+/*
+ * ps2_handle_response() stores device's response to a command and notifies
+ * the process waiting for completion of the command. Note that there is a
+ * distinction between waiting for the first byte of the response, and
+ * waiting for subsequent bytes. It is done so that callers could shorten
+ * timeouts once first byte of response is received.
+ */
+static void ps2_handle_response(struct ps2dev *ps2dev, u8 data)
+{
+ if (ps2dev->cmdcnt)
+ ps2dev->cmdbuf[--ps2dev->cmdcnt] = data;
+
+ if (ps2dev->flags & PS2_FLAG_CMD1) {
+ ps2dev->flags &= ~PS2_FLAG_CMD1;
+ if (ps2dev->cmdcnt)
+ wake_up(&ps2dev->wait);
+ }
+
+ if (!ps2dev->cmdcnt) {
+ ps2dev->flags &= ~PS2_FLAG_CMD;
+ wake_up(&ps2dev->wait);
+ }
+}
+
+/*
+ * ps2_handle_ack() processes ACK/NAK of a command from a PS/2 device,
+ * possibly applying workarounds for mice not acknowledging the "get ID"
+ * command.
+ */
+static void ps2_handle_ack(struct ps2dev *ps2dev, u8 data)
+{
+ switch (data) {
+ case PS2_RET_ACK:
+ ps2dev->nak = 0;
+ break;
+
+ case PS2_RET_NAK:
+ ps2dev->flags |= PS2_FLAG_NAK;
+ ps2dev->nak = PS2_RET_NAK;
+ break;
+
+ case PS2_RET_ERR:
+ if (ps2dev->flags & PS2_FLAG_NAK) {
+ ps2dev->flags &= ~PS2_FLAG_NAK;
+ ps2dev->nak = PS2_RET_ERR;
+ break;
+ }
+ fallthrough;
+
+ /*
+ * Workaround for mice which don't ACK the Get ID command.
+ * These are valid mouse IDs that we recognize.
+ */
+ case 0x00:
+ case 0x03:
+ case 0x04:
+ if (ps2dev->flags & PS2_FLAG_WAITID) {
+ ps2dev->nak = 0;
+ break;
+ }
+ fallthrough;
+ default:
+ /*
+ * Do not signal errors if we get unexpected reply while
+ * waiting for an ACK to the initial (first) command byte:
+ * the device might not be quiesced yet and continue
+ * delivering data. For certain commands (such as set leds and
+ * set repeat rate) that can be used during normal device
+ * operation, we even pass this data byte to the normal receive
+ * handler.
+ * Note that we reset PS2_FLAG_WAITID flag, so the workaround
+ * for mice not acknowledging the Get ID command only triggers
+ * on the 1st byte; if device spews data we really want to see
+ * a real ACK from it.
+ */
+ dev_dbg(&ps2dev->serio->dev, "unexpected %#02x\n", data);
+ if (ps2dev->flags & PS2_FLAG_PASS_NOACK)
+ ps2dev->receive_handler(ps2dev, data);
+ ps2dev->flags &= ~(PS2_FLAG_WAITID | PS2_FLAG_PASS_NOACK);
+ return;
+ }
+
+ if (!ps2dev->nak)
+ ps2dev->flags &= ~PS2_FLAG_NAK;
+
+ ps2dev->flags &= ~PS2_FLAG_ACK;
+
+ if (!ps2dev->nak && data != PS2_RET_ACK)
+ ps2_handle_response(ps2dev, data);
+ else
+ wake_up(&ps2dev->wait);
+}
+
+/*
+ * Clears state of PS/2 device after communication error by resetting majority
+ * of flags and waking up waiters, if any.
+ */
+static void ps2_cleanup(struct ps2dev *ps2dev)
+{
+ unsigned long old_flags = ps2dev->flags;
+
+ /* reset all flags except last nak */
+ ps2dev->flags &= PS2_FLAG_NAK;
+
+ if (old_flags & PS2_FLAG_ACK)
+ ps2dev->nak = 1;
+
+ if (old_flags & (PS2_FLAG_ACK | PS2_FLAG_CMD))
+ wake_up(&ps2dev->wait);
+}
+
+/**
+ * ps2_interrupt - common interrupt handler for PS/2 devices
+ * @serio: serio port for the device
+ * @data: a data byte received from the device
+ * @flags: flags such as %SERIO_PARITY or %SERIO_TIMEOUT indicating state of
+ * the data transfer
+ *
+ * ps2_interrupt() invokes pre-receive handler, optionally handles command
+ * acknowledgement and response from the device, and finally passes the data
+ * to the main protocol handler for future processing.
+ */
+irqreturn_t ps2_interrupt(struct serio *serio, u8 data, unsigned int flags) {
+ struct ps2dev *ps2dev = serio_get_drvdata(serio);
+ enum ps2_disposition rc;
+
+ rc = ps2dev->pre_receive_handler(ps2dev, data, flags);
+ switch (rc) {
+ case PS2_ERROR:
+ ps2_cleanup(ps2dev);
+ break;
+
+ case PS2_IGNORE:
+ break;
+
+ case PS2_PROCESS:
+ if (ps2dev->flags & PS2_FLAG_ACK)
+ ps2_handle_ack(ps2dev, data);
+ else if (ps2dev->flags & PS2_FLAG_CMD)
+ ps2_handle_response(ps2dev, data);
+ else
+ ps2dev->receive_handler(ps2dev, data);
+ break;
+ }
+
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(ps2_interrupt);
+
+MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
+MODULE_DESCRIPTION("PS/2 driver library");
+MODULE_LICENSE("GPL");