Message-Id: <1293020435-5680-2-git-send-email-tapio.vihuri@nokia.com>
Date:	Wed, 22 Dec 2010 14:20:33 +0200
From:	tapio.vihuri@...ia.com
To:	dmitry.torokhov@...il.com
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	ilkka.koskinen@...ia.com, samu.p.onkalo@...ia.com
Subject: [PATCH 1/3] ECI: input: introduce ECI accessory input driver

From: Tapio Vihuri <tapio.vihuri@...ia.com>

ECI stands for (Enhancement Control Interface).

ECI is better known as Multimedia Headset for Nokia phones.
If headset has many buttons, like play, vol+, vol- etc. then it is propably
ECI accessory.
Among several buttons ECI accessory contains memory for storing several
parameters.

ECI input driver provides the following features:
- reading ECI configuration memory
- ECI buttons as input events

Signed-off-by: Tapio Vihuri <tapio.vihuri@...ia.com>
---
 drivers/input/misc/Kconfig  |   18 +
 drivers/input/misc/Makefile |    2 +-
 drivers/input/misc/eci.c    | 1002 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/input/eci.h   |  157 +++++++
 4 files changed, 1178 insertions(+), 1 deletions(-)
 create mode 100644 drivers/input/misc/eci.c
 create mode 100644 include/linux/input/eci.h

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index b99b8cb..7a15bc6 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -448,4 +448,22 @@ config INPUT_ADXL34X_SPI
 	  To compile this driver as a module, choose M here: the
 	  module will be called adxl34x-spi.
 
+config INPUT_ECI
+	tristate "AV ECI (Enhancement Control Interface) input driver"
+	help
+	The Enhancement Control Interface functionality
+	  ECI is better known as Multimedia Headset for Nokia phones.
+	  If headset has many buttons, like play, vol+, vol- etc. then
+	  it is propably ECI accessory.
+	  Among several buttons ECI accessory contains memory for storing
+	  several parameters.
+
+	  ECI input driver provides the following features:
+	  - reading ECI configuration memory
+	  - ECI buttons as input events
+
+	  Say 'y' here to statically link this module into the kernel or 'm'
+	  to build it as a dynamically loadable module. The module will be
+	  called eci.ko
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 1fe1f6c..99d2289 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -42,4 +42,4 @@ obj-$(CONFIG_INPUT_WINBOND_CIR)		+= winbond-cir.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
-
+obj-$(CONFIG_INPUT_ECI)			+= eci.o
diff --git a/drivers/input/misc/eci.c b/drivers/input/misc/eci.c
new file mode 100644
index 0000000..72efccf
--- /dev/null
+++ b/drivers/input/misc/eci.c
@@ -0,0 +1,1002 @@
+/*
+ * This file is part of ECI (Enhancement Control Interface) accessory input
+ * driver
+ *
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Tapio Vihuri <tapio.vihuri@...ia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+/*
+ * ECI stands for (Enhancement Control Interface).
+ *
+ * ECI is better known as Multimedia Headset for Nokia phones.
+ * If headset has many buttons, like play, vol+, vol- etc. then it is propably
+ * ECI accessory.
+ * Among several buttons ECI accessory contains memory for storing several
+ * parameters.
+ *
+ * ECI input driver provides the following features:
+ *  - reading ECI configuration memory
+ *  - ECI buttons as input events
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/debugfs.h>
+
+#include <linux/input.h>
+#include <linux/input/eci.h>
+#include <linux/miscdevice.h>
+
+#define ECI_DRIVERNAME	"ECI_accessory"
+
+#define ECI_WAIT_SEND_BUTTON		5	/* ms */
+#define ECI_WAIT_BUS_SETTLE		40	/* ms */
+#define ECI_TRY_GET_MEMORY		2000	/* ms */
+#define ECI_TRY_INIT_IO			200	/* ms */
+#define ECI_TRY_SET_MIC			200	/* ms */
+#define ECI_KEY_REPEAT_INTERVAL		400	/* ms */
+
+#define ECI_EKEY_BLOCK_ID			0xb3
+#define ECI_ENHANCEMENT_FEATURE_BLOCK_ID	0x02
+
+/* ECI Inputs */
+#define ECI_NIL_FEATURE			0x00 /* No feature */
+#define ECI_IGNS			0x01 /* Ignition Sense */
+#define ECI_CK_HANDSET_HOOK		0x02 /* Car-Kit Handset Hook */
+#define ECI_POWER_SUPPLY		0x03 /* Power Supply/Car Battery Det  */
+#define ECI_EXT_AUD_IN			0x06 /* External audio In */
+#define ECI_SEND_END_VR			0x07 /* Send, End, and Voice Recogn */
+#define ECI_HD_PLUG			0x08 /* Headphone plug */
+#define ECI_DEV_POWER_REQ		0x0a /* Device Power Request */
+#define ECI_VOL_UP			0x0b /* Volume Up */
+#define ECI_VOL_DOWN			0x0c /* Volume Down */
+#define ECI_PLAY_PAUSE_CTRL		0x0d /* Play / Pause */
+#define ECI_STOP			0x0e /* Stop */
+#define ECI_NEXT_FF_AUTOSRC_UP		0x0f /* Next/Fast Fward/Autosearch up */
+#define ECI_PREV_REW_AUTOSEARCH_DOWN	0x10 /* Prev/Rewind/Autosearch down */
+#define ECI_POC				0x11 /* Push to Talk over Cellular */
+#define ECI_SYNC_BTN			0x14 /* Synchronization Button */
+#define ECI_MUSIC_RADIO_OFF_SELECTOR	0x15 /* Music/Radio/Off Selector */
+#define ECI_REDIAL			0x16 /* Redial */
+#define ECI_LEFT_SOFT_KEY		0x17 /* Left Soft Key */
+#define ECI_RIGHT_SOFT_KEY		0x18 /* Right Soft key */
+#define ECI_SEND_KEY			0x19 /* Send key */
+#define ECI_END_KEY			0x1a /* End key */
+#define ECI_MIDDLE_SOFT_KEY		0x1b /* Middle Soft key */
+#define ECI_UP				0x1c /* UP key/joystick direction */
+#define ECI_DOWN			0x1d /* DOWN key/joystick direction */
+#define ECI_RIGHT			0x1e /* RIGHT key/joystick direction */
+#define ECI_LEFT			0x1f /* LEFT key/joystick direction */
+#define ECI_SYMBIAN_NAVY_KEY		0x20 /* Symbian Application key */
+#define ECI_TERMINAL_APP_CTRL_IN	0x21 /* Terminal Applicat Ctrl Input */
+#define ECI_USB_CLASS_SWITCHING		0x23 /* USB Class Switching */
+#define ECI_MUTE			0x24 /* Mute */
+/* ECI Outputs */
+#define ECI_CRM				0x82 /* Car Radio Mute */
+#define ECI_PWR				0x83 /* Power */
+#define ECI_AUD_AMP			0x85 /* Audio Amplifier */
+#define ECI_EXT_AUD_SWITCH		0x86 /* External Audio Switch */
+#define ECI_HANDSET_AUDIO		0x87 /* Handset Audio */
+#define ECI_RING_INDICATOR		0x88 /* Ringing Indicator */
+#define ECI_CALL_ACTIVE			0x89 /* Call Active */
+#define ECI_ENHANCEMENT_DETECTED	0x8b /* Enhancement Detected */
+#define ECI_AUDIO_BLOCK_IN_USE		0x8e /* Audio Block In Use */
+#define ECI_STEREO_AUDIO_ACTIVE		0x8f /* stereo audio used in terminal */
+#define ECI_MONO_AUDIO_ACTIVE		0x90 /* mono audio used in terminal */
+#define ECI_TERMINAL_APP_CTRL_OUT	0x91 /* Terminal Applicat Ctrl Output */
+
+/*
+ * Most of these are key events.
+ * Switch event codes are put on top of keys (KEY_MAX ->)
+ */
+static int eci_codes[] = {
+	KEY_UNKNOWN,		/* 0  ECI_NIL_FEATURE */
+	KEY_UNKNOWN,		/* 1  ECI_IGNS */
+	KEY_UNKNOWN,		/* 2  ECI_CK_HANDSET_HOOK */
+	KEY_BATTERY,		/* 3  ECI_POWER_SUPPLY */
+	KEY_RESERVED,		/* 4  ECI feature not defined */
+	KEY_RESERVED,		/* 5  ECI feature not defined */
+	KEY_AUDIO,		/* 6  ECI_EXT_AUD_IN */
+	KEY_PHONE,		/* 7  ECI_SEND_END_VR */
+	KEY_MAX + SW_HEADPHONE_INSERT,	/* 8  ECI_HD_PLUG, type switchs */
+	KEY_RESERVED,		/* 9  ECI feature not defined */
+	KEY_UNKNOWN,		/* 10 ECI_DEV_POWER_REQ */
+	KEY_VOLUMEUP,		/* 11 ECI_VOL_UP */
+	KEY_VOLUMEDOWN,		/* 12 ECI_VOL_DOWN */
+	KEY_PLAYPAUSE,		/* 13 ECI_PLAY_PAUSE_CTRL */
+	KEY_STOP,		/* 14 ECI_STOP */
+	KEY_FORWARD,		/* 15 ECI_NEXT_FF_AUTOSRC_UP */
+	KEY_REWIND,		/* 16 ECI_PREV_REW_AUTOSEARCH_DOWN */
+	KEY_UNKNOWN,		/* 17 ECI_POC */
+	KEY_RESERVED,		/* 18 ECI feature not defined */
+	KEY_RESERVED,		/* 19 ECI feature not defined */
+	KEY_UNKNOWN,		/* 20 ECI_SYNC_BTN */
+	KEY_RADIO,		/* 21 ECI_MUSIC_RADIO_OFF_SELECTOR */
+	KEY_UNKNOWN,		/* 22 ECI_REDIAL */
+	KEY_UNKNOWN,		/* 23 ECI_LEFT_SOFT_KEY */
+	KEY_UNKNOWN,		/* 24 ECI_RIGHT_SOFT_KEY */
+	KEY_SEND,		/* 25 ECI_SEND_KEY */
+	KEY_END,		/* 26 ECI_END_KEY */
+	KEY_UNKNOWN,		/* 27 ECI_MIDDLE_SOFT_KEY */
+	KEY_UP,			/* 28 ECI_UP */
+	KEY_DOWN,		/* 29 ECI_DOWN */
+	KEY_RIGHT,		/* 30 ECI_RIGHT */
+	KEY_LEFT,		/* 31 ECI_LEFT */
+	KEY_UNKNOWN,		/* 32 ECI_SYMBIAN_NAVY_KEY */
+	KEY_UNKNOWN,		/* 33 ECI_TERMINAL_APP_CTRL_IN */
+	KEY_RESERVED,		/* 34 ECI feature not defined */
+	KEY_UNKNOWN,		/* 35 ECI_USB_CLASS_SWITCHING */
+	KEY_MUTE,		/* 36 ECI_MUTE */
+};
+
+/* ECI accessory register's bits */
+#define ECI_MIC_AUTO	0x00
+#define ECI_MIC_OFF	0x5a
+#define ECI_MIC_ON	0xff
+
+#define ECI_INT_ENABLE		1
+#define ECI_INT_DELAY_ENABLE	(1<<1)
+#define ECI_INT_LEN_76MS	0
+#define ECI_INT_LEN_82MS	(1<<5)
+#define ECI_INT_LEN_37MS	(2<<5)
+#define ECI_INT_LEN_19MS	(3<<5)
+#define ECI_INT_LEN_10MS	(4<<5)
+#define ECI_INT_LEN_5MS		(5<<5)
+#define ECI_INT_LEN_2MS		(6<<5)
+#define ECI_INT_LEN_120US	(7<<5)
+
+struct eci_mem_block {
+	u8 id;
+	u8 len;
+	u16 size;
+};
+
+static struct eci_cb eci_callback;
+static struct audio_hsmic_event hsmic_event;
+
+static struct eci_data *the_eci;
+
+#ifdef CONFIG_DEBUG_FS
+static void eci_accessory_event(int event, void *priv);
+static void eci_hsmic_event(void *priv, bool on);
+
+static struct dentry *eci_debugfs_dir;
+
+static ssize_t mic_read(struct file *file, char __user *user_buf,
+		size_t count, loff_t *ppos)
+{
+	/* Assosiated in default_open() */
+	struct eci_data *eci = file->private_data;
+	char buf[80], *state;
+	int len = 0;
+	int ret;
+
+	/* Do not run twice */
+	if (*ppos == 0) {
+		ret = eci->eci_hw_ops->acc_read_reg(ECICMD_MIC_CTRL, buf, 1);
+		if (ret)
+			return ret;
+
+		eci->mic_state = buf[0];
+		switch (eci->mic_state) {
+		case ECI_MIC_AUTO:
+			state = "auto";
+			break;
+		case ECI_MIC_OFF:
+			state = "off";
+			break;
+		case ECI_MIC_ON:
+			state = "on";
+			break;
+		default:
+			state = "unknown";
+			break;
+		}
+
+		len = snprintf(buf, sizeof(buf), "microphone %s\n", state);
+	}
+
+	ret = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+
+	return ret;
+}
+
+static ssize_t mic_write(struct file *file, const char __user *user_buf,
+		size_t count, loff_t *ppos)
+{
+	/* Assosiated in default_open() */
+	struct eci_data *eci = file->private_data;
+	char buf[80];
+	int buf_size;
+
+	buf_size = min(count, (sizeof(buf) - 1));
+	if (copy_from_user(buf, user_buf, buf_size))
+		return -EFAULT;
+
+	if (!memcmp(buf, "auto", 4))
+		eci_hsmic_event(eci, true);
+	else if (!memcmp(buf, "off", 3))
+		eci_hsmic_event(eci, false);
+	else if (!memcmp(buf, "on", 2)) {
+		eci->mic_state = ECI_MIC_ON;
+		if (eci->eci_hw_ops->acc_write_reg(ECICMD_MIC_CTRL,
+					eci->mic_state))
+			dev_err(eci->dev, "Unable to control headset"
+					"microphone\n");
+	}
+
+	return count;
+}
+
+static int default_open(struct inode *inode, struct file *file)
+{
+	/* Assosiated in debugfs_create_file() */
+	if (inode->i_private)
+		file->private_data = inode->i_private;
+
+	return 0;
+}
+
+static const struct file_operations mic_fops = {
+	.open		= default_open,
+	.read		= mic_read,
+	.write		= mic_write,
+};
+
+static void eci_uninitialize_debugfs(void)
+{
+	if (eci_debugfs_dir)
+		debugfs_remove_recursive(eci_debugfs_dir);
+}
+
+static long eci_initialize_debugfs(struct eci_data *eci)
+{
+	void *ok;
+
+	/* /sys/kernel/debug/ECI_accessory.# */
+	eci_debugfs_dir = debugfs_create_dir(dev_name(eci->dev), NULL);
+	if (!eci_debugfs_dir)
+		return -ENOENT;
+
+	/* Struct eci assosiated to inode->i_private */
+	ok = debugfs_create_file("mic", S_IRUGO | S_IWUSR,
+			eci_debugfs_dir, eci, &mic_fops);
+	if (!ok)
+		goto fail;
+
+	return 0;
+fail:
+	eci_uninitialize_debugfs();
+	return -ENOENT;
+}
+#else
+#define eci_initialize_debugfs(eci)	1
+#define eci_uninitialize_debugfs()
+#endif
+
+/* Returns size of accessory memory or error */
+static int eci_get_ekey(struct eci_data *eci, int *key)
+{
+	u8 buf[4];
+	struct eci_mem_block *ekey = (void *)buf;
+	int ret;
+
+	/* Read always four bytes */
+	ret = eci->eci_hw_ops->acc_read_direct(0, buf);
+
+	if (ret)
+		return ret;
+
+	if (ekey->id != ECI_EKEY_BLOCK_ID)
+		return -ENODEV;
+
+	*key = cpu_to_be16(ekey->size);
+
+	return 0;
+}
+
+static ssize_t show_eci_memory(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	if (!the_eci->mem_ok)
+		return -ENXIO;
+
+	memcpy(buf, the_eci->memory, the_eci->mem_size);
+
+	return the_eci->mem_size;
+}
+
+static ssize_t show_cable_plugged(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct eci_data *eci = dev_get_drvdata(dev);
+
+	return snprintf(buf, sizeof(buf), "Cable plugged %s\n",
+				eci->plugged ? "in" : "out");
+}
+
+static ssize_t store_cable_plugged(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t len)
+{
+	struct eci_data *eci = dev_get_drvdata(dev);
+
+	if (!memcmp(buf, "in", 2)) {
+		eci->plugged = true;
+		eci_accessory_event(ECI_EVENT_PLUG_IN, eci);
+	} else if (!memcmp(buf, "out", 3)) {
+		eci->plugged = false;
+		eci_accessory_event(ECI_EVENT_PLUG_OUT, eci);
+	}
+
+	return len;
+}
+
+static DEVICE_ATTR(memory, S_IRUGO, show_eci_memory, NULL);
+static DEVICE_ATTR(cable, S_IRUGO | S_IWUSR , show_cable_plugged,
+		store_cable_plugged);
+
+static struct attribute *eci_attributes[] = {
+	&dev_attr_memory.attr,
+	&dev_attr_cable.attr,
+	NULL
+};
+
+static struct attribute_group eci_attr_group = {
+	.attrs = eci_attributes
+};
+
+/* Read ECI device memory into buffer */
+static int eci_get_memory(struct eci_data *eci, int *restart)
+{
+	int i, ret;
+
+	for (i = *restart; i < eci->mem_size; i += 4) {
+		ret = eci->eci_hw_ops->acc_read_direct(i, eci->memory + i);
+		*restart = i;
+		if (ret)
+			return ret;
+	}
+
+	return ret;
+}
+
+/*
+ * This should be really init_features, but most oftens these are just buttons
+ */
+static int eci_init_buttons(struct eci_data *eci)
+{
+	struct enchancement_features_fixed *eff = eci->e_features_fix;
+	u8 n, mireg;
+	int ret;
+	u8 buf[4];
+
+	n = eff->number_of_features;
+
+	if (n > ECI_MAX_FEATURE_COUNT)
+		return -EINVAL;
+
+	ret = eci->eci_hw_ops->acc_write_reg(ECICMD_MIC_CTRL, ECI_MIC_OFF);
+	if (ret)
+		return ret;
+
+	ret = eci->eci_hw_ops->acc_read_reg(ECICMD_MASTER_INT_REG, buf, 1);
+	if (ret)
+		return ret;
+
+	mireg = buf[0];
+	mireg &= ~ECI_INT_ENABLE;
+	mireg |= ECI_INT_LEN_120US | ECI_INT_DELAY_ENABLE;
+
+	ret = eci->eci_hw_ops->acc_write_reg(ECICMD_MASTER_INT_REG, mireg);
+	if (ret)
+		return ret;
+
+	msleep(ECI_WAIT_BUS_SETTLE);
+	mireg |= ECI_INT_ENABLE;
+	ret = eci->eci_hw_ops->acc_write_reg(ECICMD_MASTER_INT_REG, mireg);
+	if (ret)
+		return ret;
+
+	msleep(ECI_WAIT_BUS_SETTLE);
+
+	return ret;
+}
+
+/* Find "enchangement features" block from buffer */
+static int eci_get_enchancement_features(struct eci_data *eci)
+{
+	u8 *mem = (void *)eci->memory;
+	struct eci_mem_block *b = (void *)mem;
+	struct eci_mem_block *mem_end = (void *)(eci->memory + eci->mem_size);
+
+	if (b->id != ECI_EKEY_BLOCK_ID)
+		return -ENODEV;
+
+	do {
+		dev_dbg(eci->dev, "skip BLOCK 0x%02x, LEN 0x%02x\n",
+				b->id, b->len);
+		if (!b->len)
+			return -EINVAL;
+
+		mem += b->len;
+		b = (void *)mem;
+		eci->e_features_fix = (void *)b;
+		dev_dbg(eci->dev, "found BLOCK 0x%02x, LEN 0x%02x\n",
+				b->id, b->len);
+		if (b->id == ECI_ENHANCEMENT_FEATURE_BLOCK_ID)
+			return 0;
+	} while (b < mem_end);
+
+	return -ENFILE;
+}
+
+/*
+ * Find out ECI features.
+ * All ECI memory block parsing are done here, be carefull as
+ * pointers to memory tend to go wrong easily.
+ * ECI "Enhancement Features block has variable size, so we try to
+ * catch pointers out of block due memory reading errors etc.
+ *
+ * I/O support field is not implemented.
+ * Data direction field is not implemented, nor writing to the ECI I/O
+ */
+static int eci_parse_enchancement_features(struct eci_data *eci)
+{
+	struct enchancement_features_fixed *eff = eci->e_features_fix;
+	struct enchancement_features_variable *efv = &eci->e_features_var;
+	int i;
+	u8 n, k;
+	void *mem_end = (void *)((u8 *)eff + eff->length);
+
+	dev_dbg(eci->dev, "block id 0x%02x length 0x%02x connector "
+			"configuration 0x%02x\n", eff->block_id, eff->length,
+			eff->connector_conf);
+	n = eff->number_of_features;
+	dev_dbg(eci->dev, "number of features %d\n", n);
+
+	if (n > ECI_MAX_FEATURE_COUNT)
+		return -EINVAL;
+
+	k = DIV_ROUND_UP(n, 8);
+	dev_dbg(eci->dev, "I/O support bytes count %d\n", k);
+
+	efv->io_support = &eff->number_of_features + 1;
+	/* efv->io_functionality[0] is not used! pins are in 1..31 range */
+	efv->io_functionality = efv->io_support + k - 1;
+	efv->active_state = efv->io_functionality + n + 1;
+
+	if ((void *)&efv->active_state[k] > mem_end)
+		return -EINVAL;
+
+	/* Last part of block */
+	for (i = 0; i < k; i++)
+		dev_dbg(eci->dev, "active_state[%d] 0x%02x\n", i,
+				efv->active_state[i]);
+
+	eci->buttons_data.buttons_up_mask =
+		~(u32)(cpu_to_le32(*(u32 *)efv->active_state));
+
+	/*
+	 * ECI accessory responces as many bytes needed for used I/O pins
+	 * up to four bytes, when lines 24..31 are used
+	 * all tested ECI accessories how ever return two data bytes
+	 * event though there are less than eight I/O pins
+	 *
+	 * so we get alway reading error if there are less than eight I/Os
+	 * meanwhile just use this kludge, FIXME
+	 */
+	k = DIV_ROUND_UP(n + 1, 8);
+	if (k == 1)
+		k = 2;
+	eci->port_reg_count = k;
+
+	return 0;
+}
+
+static int eci_init_accessory(struct eci_data *eci)
+{
+	int ret, key = 0, restart = 0;
+	unsigned long future;
+
+	eci->mem_ok = false;
+
+	if (!eci->eci_hw_ops)
+		return -ENXIO;
+
+	ret = eci->eci_hw_ops->acc_reset();
+	if (ret)
+		return ret;
+
+	msleep(ECI_WAIT_BUS_SETTLE);
+
+	ret = eci->eci_hw_ops->acc_write_reg(ECICMD_MIC_CTRL, ECI_MIC_OFF);
+	if (ret)
+		return ret;
+
+	/* Get ECI ekey block to determine memory size */
+	future = jiffies + msecs_to_jiffies(ECI_TRY_GET_MEMORY);
+	do {
+		ret = eci_get_ekey(eci, &key);
+		if (time_is_before_jiffies(future))
+			break;
+	} while (ret);
+
+	if (ret)
+		return ret;
+
+	eci->mem_size = key;
+	if (eci->mem_size > ECI_MAX_MEM_SIZE)
+		return -EINVAL;
+
+	/* Get ECI memory */
+	future = jiffies + msecs_to_jiffies(ECI_TRY_GET_MEMORY);
+	do {
+		ret = eci_get_memory(eci, &restart);
+		if (time_is_before_jiffies(future))
+			break;
+	} while (ret);
+
+	if (ret)
+		return ret;
+
+	if (eci_get_enchancement_features(eci))
+		return -EIO;
+
+	if (eci_parse_enchancement_features(eci))
+		return -EIO;
+
+	/*
+	 * Configure ECI buttons now as we have after parsed
+	 * enchancement features table
+	 */
+	msleep(ECI_WAIT_BUS_SETTLE);
+	future = jiffies + msecs_to_jiffies(ECI_TRY_INIT_IO);
+	do {
+		ret = eci_init_buttons(eci);
+		if (time_is_before_jiffies(future))
+			break;
+	} while (ret);
+
+	if (ret)
+		return ret;
+
+	eci->mem_ok = true;
+	msleep(ECI_WAIT_BUS_SETTLE);
+
+	if (eci->eci_hw_ops->acc_write_reg(ECICMD_MIC_CTRL, eci->mic_state))
+		dev_err(eci->dev, "Unable to control headset microphone\n");
+
+	return 0;
+}
+
+static int init_accessory_input(struct eci_data *eci)
+{
+	int err, i, code;
+
+	eci->acc_input = input_allocate_device();
+	if (!eci->acc_input) {
+		dev_err(eci->dev, "Error allocating input device: %d\n",
+				__LINE__);
+		return -ENOMEM;
+	}
+
+	eci->acc_input->name = "ECI Accessory";
+
+	/* Codes on top of KEY_MAX are switch events */
+	for (i = 0; i < ARRAY_SIZE(eci_codes); i++) {
+		code = eci_codes[i];
+		if (code >= KEY_MAX) {
+			code -= KEY_MAX;
+			set_bit(code, eci->acc_input->swbit);
+		} else {
+			set_bit(code, eci->acc_input->keybit);
+		}
+	}
+
+	set_bit(EV_KEY, eci->acc_input->evbit);
+	set_bit(EV_SW, eci->acc_input->evbit);
+	set_bit(EV_REP, eci->acc_input->evbit);
+
+	err = input_register_device(eci->acc_input);
+	if (err) {
+		dev_err(eci->dev, "Error registering input device: %d\n",
+				__LINE__);
+		goto err_free_dev;
+	}
+
+	/* Must set after input_register_device() to take effect */
+	eci->acc_input->rep[REP_PERIOD] = ECI_KEY_REPEAT_INTERVAL;
+
+	return 0;
+
+err_free_dev:
+	input_free_device(eci->acc_input);
+	return err;
+}
+
+static void remove_accessory_input(struct eci_data *eci)
+{
+	input_unregister_device(eci->acc_input);
+}
+
+/* Press/release ccessory button(s) */
+static int eci_get_button(struct eci_data *eci)
+{
+	struct enchancement_features_fixed *eff = eci->e_features_fix;
+	struct eci_buttons_data *b = &eci->buttons_data;
+
+	if (!eci->mem_ok)
+		return -ENXIO;
+
+	if (((b->buttons & 0x0000ffff) == 0) && (eff->number_of_features > 2)) {
+		dev_err(eci->dev, "ECI report all buttons down, rejected %d\n",
+			       __LINE__);
+		return -EINVAL;
+	}
+
+	if (b->windex < ECI_BUTTON_BUF_SIZE) {
+		if (b->buttons_buf[b->windex] == 0)
+			b->buttons_buf[b->windex] = b->buttons;
+		else
+			dev_err(eci->dev, "ECI button queue owerflow %d\n",
+			       __LINE__);
+	}
+	b->windex++;
+	if (b->windex == ECI_BUTTON_BUF_SIZE)
+		b->windex = 0;
+
+	return 0;
+}
+
+/* Intended to use ONLY inside eci_parse_button() ! */
+#define ACTIVE_STATE(x) (u32)(cpu_to_le32(*(u32 *)efv->active_state) & BIT(x-1))
+#define BUTTON_STATE(x) ((buttons & BIT(x))>>1)
+
+static int eci_parse_button(struct eci_data *eci, u32 buttons)
+{
+	int pin, code, state;
+	u8 n, io_fun;
+	struct enchancement_features_variable *efv = &eci->e_features_var;
+	struct enchancement_features_fixed *eff = eci->e_features_fix;
+
+	if (!eci->mem_ok)
+		return -ENXIO;
+
+	n = eff->number_of_features;
+
+	for (pin = 1; pin <= n; pin++) {
+		io_fun = efv->io_functionality[pin] & ~BIT(7);
+		if (io_fun > ECI_MUTE)
+			break;
+		code = eci_codes[io_fun];
+		state = (BUTTON_STATE(pin) == ACTIVE_STATE(pin));
+		if (state)
+			dev_dbg(eci->dev, "I/O functionality 0x%02x\n", io_fun);
+		if (code >= KEY_MAX)
+			input_report_switch(eci->acc_input, code - KEY_MAX,
+					state);
+		else
+			input_report_key(eci->acc_input, code, state);
+	}
+	input_sync(eci->acc_input);
+
+	return 0;
+}
+
+static int eci_send_button(struct eci_data *eci)
+{
+	int i;
+	struct enchancement_features_fixed *eff = eci->e_features_fix;
+	struct eci_buttons_data *b = &eci->buttons_data;
+	u8 n;
+
+	if (!eci->mem_ok)
+		return -ENXIO;
+
+	n = eff->number_of_features;
+
+	if (n > ECI_MAX_FEATURE_COUNT)
+		return -EINVAL;
+	/*
+	 * Codes on top of KEY_MAX are switch events.
+	 * Let input system take care multiple key events
+	 */
+	for (i = 0; i < ECI_BUTTON_BUF_SIZE; i++) {
+		if (b->buttons_buf[b->rindex] == 0)
+			break;
+
+		if (eci_parse_button(eci, b->buttons_buf[b->rindex]))
+			return -ENXIO;
+
+		b->buttons_buf[b->rindex] = 0;
+		b->rindex++;
+		if (b->rindex == ECI_BUTTON_BUF_SIZE)
+			b->rindex = 0;
+	}
+
+	return 0;
+}
+
+/*
+ * Other driver(s) can call this after registering themselves using
+ * eci_register()
+ */
+static void eci_accessory_event(int event, void *priv)
+{
+	struct eci_data *eci = priv;
+	struct eci_buttons_data *b = &eci->buttons_data;
+	int delay = 0;
+	int ret = 0;
+
+	eci->event = event;
+	switch (event) {
+	case ECI_EVENT_IS_ECI:
+		eci->is_eci = true;
+		ret = eci->eci_hw_ops->acc_reset();
+		if (ret)
+			eci->is_eci = false;
+		break;
+	case ECI_EVENT_PLUG_IN:
+		eci->first_event = true;
+		ret = eci_init_accessory(eci);
+		if (ret < 0)
+			ret = eci_init_accessory(eci);
+		if (ret) {
+			dev_err(eci->dev, "Accessory init %s%s%s%sat: %d\n",
+					ret & ACI_COMMERR ? "COMMERR " : "",
+					ret & ACI_FRAERR ? "FRAERR " : "",
+					ret & ACI_RESERR ? "RESERR " : "",
+					ret & ACI_COLL ? "COLLERR " : "",
+					__LINE__);
+			break;
+		}
+		break;
+	case ECI_EVENT_PLUG_OUT:
+		eci->mem_ok = false;
+		break;
+	case ECI_EVENT_BUTTON:
+		/*
+		 * First event might not be valid due plug insertion
+		 * so we filter it out if it seems garbage
+		 */
+		if (eci->first_event) {
+			eci->first_event = false;
+			if ((b->buttons & 0xff) == 0)
+				break;
+		}
+		eci_get_button(eci);
+		delay = msecs_to_jiffies(ECI_WAIT_SEND_BUTTON);
+		schedule_delayed_work(&eci->eci_ws, delay);
+		break;
+	default:
+		dev_err(eci->dev, "unknown event %d: %d\n", event, __LINE__);
+		break;
+	}
+
+	return;
+}
+
+static void eci_hsmic_event(void *priv, bool on)
+{
+	struct eci_data *eci = priv;
+	unsigned long future;
+	int ret;
+
+	if (!eci)
+		return;
+
+	if (on)
+		eci->mic_state = ECI_MIC_AUTO;
+	else
+		eci->mic_state = ECI_MIC_OFF;
+
+	future = jiffies + msecs_to_jiffies(ECI_TRY_SET_MIC);
+	do {
+		ret = eci->eci_hw_ops->acc_write_reg(ECICMD_MIC_CTRL,
+				eci->mic_state);
+		if (time_is_before_jiffies(future))
+			break;
+	} while (ret);
+
+	if (ret)
+		dev_err(eci->dev, "Unable to control headset microphone\n");
+}
+
+/* General work func (eci_ws) for several tasks */
+static void eci_work(struct work_struct *ws)
+{
+	struct eci_data *eci;
+	int ret;
+
+	eci = container_of((struct delayed_work *)ws, struct eci_data,
+			eci_ws);
+
+	ret = eci_send_button(eci);
+	if (ret)
+		dev_err(eci->dev, "Error sending event: %d\n", __LINE__);
+}
+
+static struct miscdevice eci_device = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = ECI_DRIVERNAME,
+};
+
+struct eci_cb *eci_register(struct eci_hw_ops *eci_ops)
+{
+	if (!the_eci)
+		return ERR_PTR(-EBUSY);
+
+	if (!eci_ops || !eci_ops->acc_read_direct ||
+			!eci_ops->acc_read_reg || !eci_ops->acc_write_reg ||
+			!eci_ops->acc_reset)
+		return ERR_PTR(-EINVAL);
+
+	the_eci->eci_hw_ops = eci_ops;
+
+	return &eci_callback;
+}
+EXPORT_SYMBOL(eci_register);
+
+static int __init eci_probe(struct platform_device *pdev)
+{
+	struct eci_data *eci;
+	struct eci_platform_data *pdata = pdev->dev.platform_data;
+	int ret;
+
+	eci = kzalloc(sizeof(*eci), GFP_KERNEL);
+	if (!eci)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, eci);
+	eci->dev = &pdev->dev;
+
+	ret = misc_register(&eci_device);
+	if (ret) {
+		dev_err(eci->dev, "could not register misc_device: %d\n",
+				__LINE__);
+		goto err_misc;
+	}
+
+	the_eci = eci;
+
+	eci_callback.event              = eci_accessory_event;
+	eci_callback.priv               = eci;
+
+	ret = sysfs_create_group(&pdev->dev.kobj, &eci_attr_group);
+	if (ret) {
+		dev_err(eci->dev, "could not create sysfs entries: %d\n",
+				__LINE__);
+		goto err_sysfs;
+	}
+
+	ret = eci_initialize_debugfs(eci);
+	if (ret)
+		dev_err(eci->dev, "could not create debugfs entries: %d\n",
+				__LINE__);
+
+	ret = init_accessory_input(eci);
+	if (ret) {
+		dev_err(eci->dev, "ERROR initializing accessory input: %d\n",
+				__LINE__);
+		goto err_input;
+	}
+
+	/*
+	 * If platform machine has audio driver providing
+	 * register_hsmic_event_cb, we should give accessory microphone control,
+	 * ie. eci_hsmic_event to it.
+	 * This way audio driver get control to ECI accessory microphone and
+	 * we can save power
+	 */
+	if (pdata) {
+		if (pdata->register_hsmic_event_cb) {
+			hsmic_event.private	= eci;
+			hsmic_event.event	= eci_hsmic_event;
+			pdata->register_hsmic_event_cb(&hsmic_event);
+		}
+	}
+
+	init_waitqueue_head(&eci->wait);
+	INIT_DELAYED_WORK(&eci->eci_ws, eci_work);
+
+	eci->mem_ok = false;
+	/*
+	 * By default ECI driver leaves microphone off, to save power.
+	 * Audio driver can set microphone on by using
+	 * hsmic_event.event
+	 */
+	eci->mic_state = ECI_MIC_OFF;
+
+	/* Init buttons_data indexes and buffer */
+	memset(&eci->buttons_data, 0, sizeof(struct eci_buttons_data));
+	eci->buttons_data.buttons = 0xffffffff;
+
+	return 0;
+
+err_input:
+	eci_uninitialize_debugfs();
+	sysfs_remove_group(&pdev->dev.kobj, &eci_attr_group);
+
+err_sysfs:
+	misc_deregister(&eci_device);
+
+err_misc:
+	kfree(eci);
+
+	return ret;
+}
+
+static int __exit eci_remove(struct platform_device *pdev)
+{
+	struct eci_data *eci = platform_get_drvdata(pdev);
+	struct eci_platform_data *pdata = pdev->dev.platform_data;
+
+	pdata->register_hsmic_event_cb(NULL);
+	cancel_delayed_work_sync(&eci->eci_ws);
+	eci_uninitialize_debugfs();
+	sysfs_remove_group(&pdev->dev.kobj, &eci_attr_group);
+	remove_accessory_input(eci);
+	kfree(eci);
+	misc_deregister(&eci_device);
+
+	return 0;
+}
+
+#ifdef	CONFIG_PM
+
+static int eci_suspend(struct platform_device *pdev, pm_message_t mesg)
+{
+	return -ENOSYS;
+}
+#else
+#define	eci_suspend	NULL
+#endif
+
+static struct platform_driver eci_driver = {
+	.probe		= eci_probe,
+	.remove		= __exit_p(eci_remove),
+	.suspend	= eci_suspend,
+	.driver		= {
+		.name	= ECI_DRIVERNAME,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init eci_init(void)
+{
+	return platform_driver_register(&eci_driver);
+}
+device_initcall(eci_init);
+
+static void __exit eci_exit(void)
+{
+	platform_driver_unregister(&eci_driver);
+}
+module_exit(eci_exit);
+
+MODULE_ALIAS("platform:" ECI_DRIVERNAME);
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_DESCRIPTION("ECI accessory driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/input/eci.h b/include/linux/input/eci.h
new file mode 100644
index 0000000..b8be99c
--- /dev/null
+++ b/include/linux/input/eci.h
@@ -0,0 +1,157 @@
+/*
+ * This file is part of ECI (Enhancement Control Interface) driver
+ *
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Tapio Vihuri <tapio.vihuri@...ia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+#ifndef __ECI_H__
+#define __ECI_H__
+
+#define ECI_MAX_MEM_SIZE	0x7c
+#define ECI_BUTTON_BUF_SIZE	32
+#define ECI_MAX_FEATURE_COUNT	31
+
+#define ACI_COMMERR	0x010
+#define ACI_FRAERR	0x020
+#define ACI_RESERR	0x040
+#define ACI_COLL	0x080
+
+#define ECI_REAL_BUTTONS	0
+#define ECI_FORCE_BUTTONS_UP	1
+
+/* fixed in ECI HW, do not change */
+enum {
+	ECICMD_HWID,
+	ECICMD_SWID,
+	ECICMD_ECI_BUS_SPEED,
+	ECICMD_MIC_CTRL,
+	ECICMD_MASTER_INT_REG,
+	ECICMD_HW_CONF_MEM_ACCESS,
+	ECICMD_EXTENDED_MEM_ACCESS,
+	ECICMD_INDIRECT_MEM_ACCESS,
+	ECICMD_PORT_DATA_0,
+	ECICMD_PORT_DATA_1,
+	ECICMD_PORT_DATA_2,
+	ECICMD_PORT_DATA_3,
+	ECICMD_LATCHED_PORT_DATA_0,
+	ECICMD_LATCHED_PORT_DATA_1,
+	ECICMD_LATCHED_PORT_DATA_2,
+	ECICMD_LATCHED_PORT_DATA_3,
+	ECICMD_DATA_DIR_0,
+	ECICMD_DATA_DIR_1,
+	ECICMD_DATA_DIR_2,
+	ECICMD_DATA_DIR_3,
+	ECICMD_INT_CONFIG_0_LOW,
+	ECICMD_INT_CONFIG_0_HIGH,
+	ECICMD_INT_CONFIG_1_LOW,
+	ECICMD_INT_CONFIG_1_HIGH,
+	ECICMD_INT_CONFIG_2_LOW,
+	ECICMD_INT_CONFIG_2_HIGH,
+	ECICMD_INT_CONFIG_3_LOW,
+	ECICMD_INT_CONFIG_3_HIGH,
+	/*
+	 * 0x1c - 0x2f reserved for future
+	 * 0x30 - 0x3d reserved
+	 */
+	ECICMD_EEPROM_LOCK = 0x3e,
+	ECICMD_RESERVED,	/* 0x3f */
+	ECIREG_STATUS,		/* 0x40 */
+	ECIREG_READ_COUNT,	/* 0x41 */
+	ECIREG_BUF_COUNT,	/* 0x42 */
+	ECIREG_RST_LEARN,	/* 0x43 */
+	/* 0x44 - 0xdf as data buffer */
+	ECIREG_READ_DIRECT,	/* 0x44 */
+	ECIREG_HW_ID = 0xe0,	/* 0xe0 */
+	ECIREG_FW_ID,		/* 0xe1 */
+	ECIREG_TEST_IN,		/* 0xe2 */
+	ECIREG_TEST_OUT,	/* 0xe3 */
+};
+
+enum {
+	ECI_EVENT_IS_ECI,
+	ECI_EVENT_PLUG_IN,
+	ECI_EVENT_PLUG_OUT,
+	ECI_EVENT_BUTTON,
+	ECI_EVENT_NO,
+};
+
+struct eci_hw_ops {
+	int (*acc_reset)(void);
+	int (*acc_read_direct)(u8 addr, char *buf);
+	int (*acc_read_reg)(u8 reg, u8 *buf, int count);
+	int (*acc_write_reg)(u8 reg, u8 param);
+};
+
+struct eci_cb {
+	void *priv;
+	void (*event)(int event, void *priv);
+};
+
+struct audio_hsmic_event {
+	void *private;
+	void (*event)(void *priv, bool on);
+};
+
+struct eci_platform_data {
+	void (*register_hsmic_event_cb)(struct audio_hsmic_event *);
+};
+
+struct enchancement_features_fixed {
+	u8	block_id;
+	u8	length;
+	u8	connector_conf;
+	u8	number_of_features;
+};
+
+struct enchancement_features_variable {
+	u8	*io_support;
+	u8	*io_functionality;
+	u8	*active_state;
+};
+
+struct eci_buttons_data {
+	u32	buttons;
+	int	windex;
+	int	rindex;
+	u32	buttons_up_mask;
+	u32	buttons_buf[ECI_BUTTON_BUF_SIZE];
+};
+
+struct eci_data {
+	struct device				*dev;
+	struct delayed_work			eci_ws;
+	wait_queue_head_t			 wait;
+	struct input_dev			*acc_input;
+	int					event;
+	bool					first_event;
+	bool					mem_ok;
+	u16					mem_size;
+	u8					memory[ECI_MAX_MEM_SIZE];
+	struct enchancement_features_fixed	*e_features_fix;
+	struct enchancement_features_variable	e_features_var;
+	u8					port_reg_count;
+	struct eci_buttons_data			buttons_data;
+	struct eci_hw_ops			*eci_hw_ops;
+	u8					mic_state;
+	bool					plugged;
+	bool					is_eci;
+};
+
+struct eci_cb *eci_register(struct eci_hw_ops *eci_ops);
+#endif
-- 
1.6.5

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