synaptics.c

qq2440板子上

 *  called for each full received packet from the touchpad
 */
static void synaptics_process_packet(struct psmouse *psmouse)
{
	struct input_dev *dev = &psmouse->dev;
	struct synaptics_data *priv = psmouse->private;
	struct synaptics_hw_state hw;
	int num_fingers;
	int finger_width;
	int i;

	synaptics_parse_hw_state(psmouse->packet, priv, &hw);

	if (hw.scroll) {
		priv->scroll += hw.scroll;

		while (priv->scroll >= 4) {
			input_report_key(dev, BTN_BACK, !hw.down);
			input_sync(dev);
			input_report_key(dev, BTN_BACK, hw.down);
			input_sync(dev);
			priv->scroll -= 4;
		}
		while (priv->scroll <= -4) {
			input_report_key(dev, BTN_FORWARD, !hw.up);
			input_sync(dev);
			input_report_key(dev, BTN_FORWARD, hw.up);
			input_sync(dev);
			priv->scroll += 4;
		}
		return;
	}

	if (hw.z > 0) {
		num_fingers = 1;
		finger_width = 5;
		if (SYN_CAP_EXTENDED(priv->capabilities)) {
			switch (hw.w) {
			case 0 ... 1:
				if (SYN_CAP_MULTIFINGER(priv->capabilities))
					num_fingers = hw.w + 2;
				break;
			case 2:
				if (SYN_MODEL_PEN(priv->model_id))
					;   /* Nothing, treat a pen as a single finger */
				break;
			case 4 ... 15:
				if (SYN_CAP_PALMDETECT(priv->capabilities))
					finger_width = hw.w;
				break;
			}
		}
	} else {
		num_fingers = 0;
		finger_width = 0;
	}

	/* Post events
	 * BTN_TOUCH has to be first as mousedev relies on it when doing
	 * absolute -> relative conversion
	 */
	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);

	if (hw.z > 0) {
		input_report_abs(dev, ABS_X, hw.x);
		input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
	}
	input_report_abs(dev, ABS_PRESSURE, hw.z);

	input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
	input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
	input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
	input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);

	input_report_key(dev, BTN_LEFT, hw.left);
	input_report_key(dev, BTN_RIGHT, hw.right);

	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
		input_report_key(dev, BTN_MIDDLE, hw.middle);

	if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
		input_report_key(dev, BTN_FORWARD, hw.up);
		input_report_key(dev, BTN_BACK, hw.down);
	}

	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
		input_report_key(dev, BTN_0 + i, hw.ext_buttons & (1 << i));

	input_sync(dev);
}

static int synaptics_validate_byte(unsigned char packet[], int idx, unsigned char pkt_type)
{
	static unsigned char newabs_mask[]	= { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
	static unsigned char newabs_rel_mask[]	= { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
	static unsigned char newabs_rslt[]	= { 0x80, 0x00, 0x00, 0xC0, 0x00 };
	static unsigned char oldabs_mask[]	= { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
	static unsigned char oldabs_rslt[]	= { 0xC0, 0x00, 0x00, 0x80, 0x00 };

	if (idx < 0 || idx > 4)
		return 0;

	switch (pkt_type) {
		case SYN_NEWABS:
		case SYN_NEWABS_RELAXED:
			return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];

		case SYN_NEWABS_STRICT:
			return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];

		case SYN_OLDABS:
			return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];

		default:
			printk(KERN_ERR "synaptics: unknown packet type %d\n", pkt_type);
			return 0;
	}
}

static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
{
	int i;

	for (i = 0; i < 5; i++)
		if (!synaptics_validate_byte(psmouse->packet, i, SYN_NEWABS_STRICT)) {
			printk(KERN_INFO "synaptics: using relaxed packet validation\n");
			return SYN_NEWABS_RELAXED;
		}

	return SYN_NEWABS_STRICT;
}

static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
{
	struct input_dev *dev = &psmouse->dev;
	struct synaptics_data *priv = psmouse->private;

	input_regs(dev, regs);

	if (psmouse->pktcnt >= 6) { /* Full packet received */
		if (unlikely(priv->pkt_type == SYN_NEWABS))
			priv->pkt_type = synaptics_detect_pkt_type(psmouse);

		if (SYN_CAP_PASS_THROUGH(priv->capabilities) && synaptics_is_pt_packet(psmouse->packet)) {
			if (psmouse->ps2dev.serio->child)
				synaptics_pass_pt_packet(psmouse->ps2dev.serio->child, psmouse->packet);
		} else
			synaptics_process_packet(psmouse);

		return PSMOUSE_FULL_PACKET;
	}

	return synaptics_validate_byte(psmouse->packet, psmouse->pktcnt - 1, priv->pkt_type) ?
		PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
}

/*****************************************************************************
 *	Driver initialization/cleanup functions
 ****************************************************************************/
static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
{
	int i;

	set_bit(EV_ABS, dev->evbit);
	input_set_abs_params(dev, ABS_X, XMIN_NOMINAL, XMAX_NOMINAL, 0, 0);
	input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL, YMAX_NOMINAL, 0, 0);
	input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
	set_bit(ABS_TOOL_WIDTH, dev->absbit);

	set_bit(EV_KEY, dev->evbit);
	set_bit(BTN_TOUCH, dev->keybit);
	set_bit(BTN_TOOL_FINGER, dev->keybit);
	set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
	set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);

	set_bit(BTN_LEFT, dev->keybit);
	set_bit(BTN_RIGHT, dev->keybit);

	if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
		set_bit(BTN_MIDDLE, dev->keybit);

	if (SYN_CAP_FOUR_BUTTON(priv->capabilities) ||
	    SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
		set_bit(BTN_FORWARD, dev->keybit);
		set_bit(BTN_BACK, dev->keybit);
	}

	for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
		set_bit(BTN_0 + i, dev->keybit);

	clear_bit(EV_REL, dev->evbit);
	clear_bit(REL_X, dev->relbit);
	clear_bit(REL_Y, dev->relbit);
}

void synaptics_reset(struct psmouse *psmouse)
{
	/* reset touchpad back to relative mode, gestures enabled */
	synaptics_mode_cmd(psmouse, 0);
}

static void synaptics_disconnect(struct psmouse *psmouse)
{
	synaptics_reset(psmouse);
	kfree(psmouse->private);
	psmouse->private = NULL;
}

static int synaptics_reconnect(struct psmouse *psmouse)
{
	struct synaptics_data *priv = psmouse->private;
	struct synaptics_data old_priv = *priv;

	if (synaptics_detect(psmouse, 0))
		return -1;

	if (synaptics_query_hardware(psmouse)) {
		printk(KERN_ERR "Unable to query Synaptics hardware.\n");
		return -1;
	}

	if (old_priv.identity != priv->identity ||
	    old_priv.model_id != priv->model_id ||
	    old_priv.capabilities != priv->capabilities ||
	    old_priv.ext_cap != priv->ext_cap)
		return -1;

	if (synaptics_set_absolute_mode(psmouse)) {
		printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
		return -1;
	}

	return 0;
}

int synaptics_detect(struct psmouse *psmouse, int set_properties)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	unsigned char param[4];

	param[0] = 0;

	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
	ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);

	if (param[1] != 0x47)
		return -1;

	if (set_properties) {
		psmouse->vendor = "Synaptics";
		psmouse->name = "TouchPad";
	}

	return 0;
}

#if defined(__i386__)
#include <linux/dmi.h>
static struct dmi_system_id toshiba_dmi_table[] = {
	{
		.ident = "Toshiba Satellite",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME , "Satellite"),
		},
	},
	{
		.ident = "Toshiba Dynabook",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
			DMI_MATCH(DMI_PRODUCT_NAME , "dynabook"),
		},
	},
	{ }
};
#endif

int synaptics_init(struct psmouse *psmouse)
{
	struct synaptics_data *priv;

	psmouse->private = priv = kmalloc(sizeof(struct synaptics_data), GFP_KERNEL);
	if (!priv)
		return -1;
	memset(priv, 0, sizeof(struct synaptics_data));

	if (synaptics_query_hardware(psmouse)) {
		printk(KERN_ERR "Unable to query Synaptics hardware.\n");
		goto init_fail;
	}

	if (synaptics_set_absolute_mode(psmouse)) {
		printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
		goto init_fail;
	}

	priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;

	printk(KERN_INFO "Synaptics Touchpad, model: %ld, fw: %ld.%ld, id: %#lx, caps: %#lx/%#lx\n",
		SYN_ID_MODEL(priv->identity),
		SYN_ID_MAJOR(priv->identity), SYN_ID_MINOR(priv->identity),
		priv->model_id, priv->capabilities, priv->ext_cap);

	set_input_params(&psmouse->dev, priv);

	psmouse->protocol_handler = synaptics_process_byte;
	psmouse->set_rate = synaptics_set_rate;
	psmouse->disconnect = synaptics_disconnect;
	psmouse->reconnect = synaptics_reconnect;
	psmouse->pktsize = 6;

	if (SYN_CAP_PASS_THROUGH(priv->capabilities))
		synaptics_pt_create(psmouse);

#if defined(__i386__)
	/*
	 * Toshiba's KBC seems to have trouble handling data from
	 * Synaptics as full rate, switch to lower rate which is roughly
	 * thye same as rate of standard PS/2 mouse.
	 */
	if (psmouse->rate >= 80 && dmi_check_system(toshiba_dmi_table)) {
		printk(KERN_INFO "synaptics: Toshiba %s detected, limiting rate to 40pps.\n",
			dmi_get_system_info(DMI_PRODUCT_NAME));
		psmouse->rate = 40;
	}
#endif

	return 0;

 init_fail:
	kfree(priv);
	return -1;
}