Input: libps2 - introduce common interrupt handler

}

/*

 * atkbd_interrupt(). Here takes place processing of data received from

 * the keyboard into events.

 * Tries to handle frame or parity error by requesting the keyboard controller

 * to resend the last byte. This historically not done on x86 as controllers

 * there typically do not implement this command.

 */

static irqreturn_t atkbd_interrupt(struct serio *serio, unsigned char data,

				   unsigned int flags)

static bool __maybe_unused atkbd_handle_frame_error(struct ps2dev *ps2dev,

						    u8 data, unsigned int flags)

{

	struct atkbd *atkbd = atkbd_from_serio(serio);

	struct input_dev *dev = atkbd->dev;

	unsigned int code = data;

	int scroll = 0, hscroll = 0, click = -1;

	int value;

	unsigned short keycode;

	struct atkbd *atkbd = container_of(ps2dev, struct atkbd, ps2dev);

	struct serio *serio = ps2dev->serio;

	dev_dbg(&serio->dev, "Received %02x flags %02x\n", data, flags);

#if !defined(__i386__) && !defined (__x86_64__)

	if ((flags & (SERIO_FRAME | SERIO_PARITY)) && (~flags & SERIO_TIMEOUT) && !atkbd->resend && atkbd->write) {

	if ((flags & (SERIO_FRAME | SERIO_PARITY)) &&

	    (~flags & SERIO_TIMEOUT) &&

	    !atkbd->resend && atkbd->write) {

		dev_warn(&serio->dev, "Frame/parity error: %02x\n", flags);

		serio_write(serio, ATKBD_CMD_RESEND);

		atkbd->resend = true;

		goto out;

		return true;

	}

	if (!flags && data == ATKBD_RET_ACK)

		atkbd->resend = false;

	return false;

}

static enum ps2_disposition atkbd_pre_receive_byte(struct ps2dev *ps2dev,

						   u8 data, unsigned int flags)

{

	struct serio *serio = ps2dev->serio;

	dev_dbg(&serio->dev, "Received %02x flags %02x\n", data, flags);

#if !defined(__i386__) && !defined (__x86_64__)

	if (atkbd_handle_frame_error(ps2dev, data, flags))

		return PS2_IGNORE;

#endif

	if (unlikely(atkbd->ps2dev.flags & PS2_FLAG_ACK))

		if  (ps2_handle_ack(&atkbd->ps2dev, data))

			goto out;

	return PS2_PROCESS;

}

	if (unlikely(atkbd->ps2dev.flags & PS2_FLAG_CMD))

		if  (ps2_handle_response(&atkbd->ps2dev, data))

			goto out;

static void atkbd_receive_byte(struct ps2dev *ps2dev, u8 data)

{

	struct serio *serio = ps2dev->serio;

	struct atkbd *atkbd = container_of(ps2dev, struct atkbd, ps2dev);

	struct input_dev *dev = atkbd->dev;

	unsigned int code = data;

	int scroll = 0, hscroll = 0, click = -1;

	int value;

	unsigned short keycode;

	pm_wakeup_event(&serio->dev, 0);

	if (!atkbd->enabled)

		goto out;

		return;

	input_event(dev, EV_MSC, MSC_RAW, code);

	case ATKBD_RET_BAT:

		atkbd->enabled = false;

		serio_reconnect(atkbd->ps2dev.serio);

		goto out;

		return;

	case ATKBD_RET_EMUL0:

		atkbd->emul = 1;

		goto out;

		return;

	case ATKBD_RET_EMUL1:

		atkbd->emul = 2;

		goto out;

		return;

	case ATKBD_RET_RELEASE:

		atkbd->release = true;

		goto out;

		return;

	case ATKBD_RET_ACK:

	case ATKBD_RET_NAK:

		if (printk_ratelimit())

				 "Spurious %s on %s. "

				 "Some program might be trying to access hardware directly.\n",

				 data == ATKBD_RET_ACK ? "ACK" : "NAK", serio->phys);

		goto out;

		return;

	case ATKBD_RET_ERR:

		atkbd->err_count++;

		dev_dbg(&serio->dev, "Keyboard on %s reports too many keys pressed.\n",

			serio->phys);

		goto out;

		return;

	}

	code = atkbd_compat_scancode(atkbd, code);

	if (atkbd->emul && --atkbd->emul)

		goto out;

		return;

	keycode = atkbd->keycode[code];

	}

	atkbd->release = false;

out:

	return IRQ_HANDLED;

}

static int atkbd_set_repeat_rate(struct atkbd *atkbd)

		goto fail1;

	atkbd->dev = dev;

	ps2_init(&atkbd->ps2dev, serio);

	ps2_init(&atkbd->ps2dev, serio,

		 atkbd_pre_receive_byte, atkbd_receive_byte);

	INIT_DELAYED_WORK(&atkbd->event_work, atkbd_event_work);

	mutex_init(&atkbd->mutex);

	},

	.description	= DRIVER_DESC,

	.id_table	= atkbd_serio_ids,

	.interrupt	= atkbd_interrupt,

	.interrupt	= ps2_interrupt,

	.connect	= atkbd_connect,

	.reconnect	= atkbd_reconnect,

	.disconnect	= atkbd_disconnect,

	}

}

/*

 * psmouse_interrupt() handles incoming characters, either passing them

 * for normal processing or gathering them as command response.

 */

static irqreturn_t psmouse_interrupt(struct serio *serio,

				     u8 data, unsigned int flags)

static enum ps2_disposition psmouse_pre_receive_byte(struct ps2dev *ps2dev,

						     u8 data,

						     unsigned int flags)

{

	struct psmouse *psmouse = psmouse_from_serio(serio);

	struct psmouse *psmouse = container_of(ps2dev, struct psmouse, ps2dev);

	if (psmouse->state == PSMOUSE_IGNORE)

		goto out;

		return PS2_IGNORE;

	if (unlikely((flags & SERIO_TIMEOUT) ||

		     ((flags & SERIO_PARITY) &&

				     "bad data from KBC -%s%s\n",

				     flags & SERIO_TIMEOUT ? " timeout" : "",

				     flags & SERIO_PARITY ? " bad parity" : "");

		ps2_cmd_aborted(&psmouse->ps2dev);

		goto out;

		return PS2_ERROR;

	}

	if (flags & SERIO_OOB_DATA) {

		psmouse_handle_oob_data(psmouse, data);

		goto out;

		return PS2_IGNORE;

	}

	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_ACK))

		if  (ps2_handle_ack(&psmouse->ps2dev, data))

			goto out;

	return PS2_PROCESS;

}

	if (unlikely(psmouse->ps2dev.flags & PS2_FLAG_CMD))

		if  (ps2_handle_response(&psmouse->ps2dev, data))

			goto out;

static void psmouse_receive_byte(struct ps2dev *ps2dev, u8 data)

{

	struct psmouse *psmouse = container_of(ps2dev, struct psmouse, ps2dev);

	pm_wakeup_event(&serio->dev, 0);

	pm_wakeup_event(&ps2dev->serio->dev, 0);

	if (psmouse->state <= PSMOUSE_RESYNCING)

		goto out;

		return;

	if (psmouse->state == PSMOUSE_ACTIVATED &&

	    psmouse->pktcnt && time_after(jiffies, psmouse->last + HZ/2)) {

		psmouse->badbyte = psmouse->packet[0];

		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);

		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);

		goto out;

		return;

	}

	psmouse->packet[psmouse->pktcnt++] = data;

	if (unlikely(psmouse->packet[0] == PSMOUSE_RET_BAT && psmouse->pktcnt <= 2)) {

		if (psmouse->pktcnt == 1) {

			psmouse->last = jiffies;

			goto out;

			return;

		}

		if (psmouse->packet[1] == PSMOUSE_RET_ID ||

		    (psmouse->protocol->type == PSMOUSE_HGPK &&

		     psmouse->packet[1] == PSMOUSE_RET_BAT)) {

			__psmouse_set_state(psmouse, PSMOUSE_IGNORE);

			serio_reconnect(serio);

			goto out;

			serio_reconnect(ps2dev->serio);

			return;

		}

		/* Not a new device, try processing first byte normally */

		psmouse->pktcnt = 1;

		if (psmouse_handle_byte(psmouse))

			goto out;

			return;

		psmouse->packet[psmouse->pktcnt++] = data;

	}

		psmouse->badbyte = psmouse->packet[0];

		__psmouse_set_state(psmouse, PSMOUSE_RESYNCING);

		psmouse_queue_work(psmouse, &psmouse->resync_work, 0);

		goto out;

		return;

	}

	psmouse->last = jiffies;

	psmouse_handle_byte(psmouse);

 out:

	return IRQ_HANDLED;

}

/*

	if (!psmouse || !input_dev)

		goto err_free;

	ps2_init(&psmouse->ps2dev, serio);

	ps2_init(&psmouse->ps2dev, serio,

		 psmouse_pre_receive_byte, psmouse_receive_byte);

	INIT_DELAYED_WORK(&psmouse->resync_work, psmouse_resync);

	psmouse->dev = input_dev;

	snprintf(psmouse->phys, sizeof(psmouse->phys), "%s/input0", serio->phys);

	},

	.description	= DRIVER_DESC,

	.id_table	= psmouse_serio_ids,

	.interrupt	= psmouse_interrupt,

	.interrupt	= ps2_interrupt,

	.connect	= psmouse_connect,

	.reconnect	= psmouse_reconnect,

	.fast_reconnect	= psmouse_fast_reconnect,

#define DRIVER_DESC	"PS/2 driver library"

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");

MODULE_DESCRIPTION("PS/2 driver library");

MODULE_LICENSE("GPL");

#define PS2_CMD_SETSCALE11	0x00e6

#define PS2_CMD_SETRES		0x10e8

#define PS2_CMD_GETID		0x02f2

#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 */

static int ps2_do_sendbyte(struct ps2dev *ps2dev, u8 byte,

			   unsigned int timeout, unsigned int max_attempts)

	return error;

}

/*

 * ps2_sendbyte() sends a byte to the device and waits for acknowledge.

 * It doesn't handle retransmission, the caller is expected to handle

/**

 * 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;

}

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;

}

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;

}

EXPORT_SYMBOL(ps2_end_command);

/*

 * ps2_drain() waits for device to transmit requested number of bytes

 * and discards them.

/**

 * 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)) {

}

EXPORT_SYMBOL(ps2_drain);

/*

 * ps2_is_keyboard_id() checks received ID byte against the list of

 * known keyboard IDs.

/**

 * 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[] = {

 * 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)

{

	return timeout;

}

/*

 * ps2_command() sends a command and its parameters to the mouse,

 * then waits for the response and puts it in the param array.

/**

 * __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

 *

 * ps2_command() can only be called from a process context

 * 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;

}

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;

}

EXPORT_SYMBOL(ps2_command);

/*

 * ps2_sliced_command() sends an extended PS/2 command to the mouse

 * using sliced syntax, understood by advanced devices, such as Logitech

 * or Synaptics touchpads. The command is encoded as:

/**

 * 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;

}

EXPORT_SYMBOL(ps2_sliced_command);

/*

 * ps2_init() initializes ps2dev structure

/**

 * 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)

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);

EXPORT_SYMBOL(ps2_init);

/*

 * ps2_handle_ack() is supposed to be used in interrupt handler

 * to properly process ACK/NAK of a command from a PS/2 device.

 * 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);

	}

}

bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data)

/*

 * 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:

		 */

		dev_dbg(&ps2dev->serio->dev, "unexpected %#02x\n", data);

		ps2dev->flags &= ~PS2_FLAG_WAITID;

		return true;

		return;

	}

	if (!ps2dev->nak)

		ps2dev->flags &= ~PS2_FLAG_NAK;

	ps2dev->flags &= ~PS2_FLAG_ACK;

	wake_up(&ps2dev->wait);

	if (!ps2dev->nak && data != PS2_RET_ACK)

		ps2_handle_response(ps2dev, data);

	return true;

}

EXPORT_SYMBOL(ps2_handle_ack);

/*

 * ps2_handle_response() is supposed to be used in interrupt handler

 * to properly store device's response to a command and notify process

 * waiting for completion of the command.

 */

bool 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;

	else

		wake_up(&ps2dev->wait);

}

	return true;

}

EXPORT_SYMBOL(ps2_handle_response);

/*

 * Clears state of PS/2 device after communication error by resetting majority

 * of flags and waking up waiters, if any.

 */

void ps2_cmd_aborted(struct ps2dev *ps2dev)

static void ps2_cleanup(struct ps2dev *ps2dev)

{

	unsigned long old_flags = ps2dev->flags;

	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_cmd_aborted);

EXPORT_SYMBOL(ps2_interrupt);

MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");

MODULE_DESCRIPTION("PS/2 driver library");

MODULE_LICENSE("GPL");

 */

#include <linux/bitops.h>

#include <linux/interrupt.h>

#include <linux/mutex.h>

#include <linux/types.h>

#include <linux/wait.h>

#define PS2_CMD_SETSCALE11	0x00e6

#define PS2_CMD_SETRES		0x10e8

#define PS2_CMD_GETID		0x02f2

#define PS2_CMD_RESET_BAT	0x02ff

struct ps2dev;

#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

/**

 * enum ps2_disposition - indicates how received byte should be handled

 * @PS2_PROCESS: pass to the main protocol handler, process normally

 * @PS2_IGNORE: skip the byte

 * @PS2_ERROR: do not process the byte, abort command in progress

 */

enum ps2_disposition {

	PS2_PROCESS,

	PS2_IGNORE,

	PS2_ERROR,

};

#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 */

typedef enum ps2_disposition (*ps2_pre_receive_handler_t)(struct ps2dev *, u8,

							  unsigned int);

typedef void (*ps2_receive_handler_t)(struct ps2dev *, u8);

/**