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Subject[PATCH v5 1/3] ECI: input: introduce ECI accessory input driver
Date
From: Tapio Vihuri <tapio.vihuri@nokia.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@nokia.com>
---
drivers/input/misc/Kconfig | 19 +
drivers/input/misc/Makefile | 2 +-
drivers/input/misc/eci.c | 931 +++++++++++++++++++++++++++++++++++++++++++
include/linux/input/eci.h | 157 ++++++++
4 files changed, 1108 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 b0c6772..56cdc62 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -114,6 +114,25 @@ config INPUT_APANEL
To compile this driver as a module, choose M here: the module will
be called apanel.

+config INPUT_ECI
+ tristate "AV ECI (Enhancement Control Interface) input driver"
+ select INPUT_SPARSEKMAP
+ 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
+
config INPUT_IXP4XX_BEEPER
tristate "IXP4XX Beeper support"
depends on ARCH_IXP4XX
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 9b47971..fa99597 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
+obj-$(CONFIG_INPUT_ECI) += eci.o
obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
@@ -43,4 +44,3 @@ obj-$(CONFIG_INPUT_UINPUT) += uinput.o
obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
-
diff --git a/drivers/input/misc/eci.c b/drivers/input/misc/eci.c
new file mode 100644
index 0000000..742e755
--- /dev/null
+++ b/drivers/input/misc/eci.c
@@ -0,0 +1,931 @@
+/*
+ * This file is part of ECI (Enhancement Control Interface) accessory input
+ * driver
+ *
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Tapio Vihuri <tapio.vihuri@nokia.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/sparse-keymap.h>
+#include <linux/input/eci.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
+
+/* Map ECI inputs to events */
+static const struct key_entry eci_keymap[] = {
+ { KE_KEY, 0x00, { KEY_UNKNOWN } }, /* No feature */
+ { KE_KEY, 0x01, { KEY_UNKNOWN } }, /* Ignition Sense */
+ { KE_KEY, 0x02, { KEY_UNKNOWN } }, /* Car-Kit Handset Hook */
+ { KE_KEY, 0x03, { KEY_BATTERY } }, /* Power Supply/Car Battery Det */
+ { KE_KEY, 0x06, { KEY_AUDIO } }, /* External audio In */
+ { KE_KEY, 0x07, { KEY_PHONE } }, /* Send, End, and Voice Recogn */
+ { KE_VSW, 0x08, { .sw = { SW_HEADPHONE_INSERT} } }, /* Headphone plug */
+ { KE_KEY, 0x0a, { KEY_UNKNOWN } }, /* Device Power Request */
+ { KE_KEY, 0x0b, { KEY_VOLUMEUP } }, /* Volume Up */
+ { KE_KEY, 0x0c, { KEY_VOLUMEDOWN } }, /* Volume Down */
+ { KE_KEY, 0x0d, { KEY_PLAYPAUSE } }, /* Play / Pause */
+ { KE_KEY, 0x0e, { KEY_STOP } }, /* Stop */
+ { KE_KEY, 0x0f, { KEY_FORWARD } }, /* Next/Fast Fward/Autosearch up */
+ { KE_KEY, 0x10, { KEY_REWIND } }, /* Prev/Rewind/Autosearch down */
+ { KE_KEY, 0x11, { KEY_UNKNOWN } }, /* Push to Talk over Cellular */
+ { KE_KEY, 0x14, { KEY_UNKNOWN } }, /* Synchronization Button */
+ { KE_KEY, 0x15, { KEY_RADIO } }, /* Music/Radio/Off Selector */
+ { KE_KEY, 0x16, { KEY_UNKNOWN } }, /* Redial */
+ { KE_KEY, 0x17, { KEY_UNKNOWN } }, /* Left Soft Key */
+ { KE_KEY, 0x18, { KEY_UNKNOWN } }, /* Right Soft key */
+ { KE_KEY, 0x19, { KEY_SEND } }, /* Send key */
+ { KE_KEY, 0x1a, { KEY_END } }, /* End key */
+ { KE_KEY, 0x1b, { KEY_UNKNOWN } }, /* Middle Soft key */
+ { KE_KEY, 0x1c, { KEY_UP } }, /* UP key/joystick direction */
+ { KE_KEY, 0x1d, { KEY_DOWN } }, /* DOWN key/joystick direction */
+ { KE_KEY, 0x1e, { KEY_RIGHT } }, /* RIGHT key/joystick direction */
+ { KE_KEY, 0x1f, { KEY_LEFT } }, /* LEFT key/joystick direction */
+ { KE_KEY, 0x20, { KEY_UNKNOWN } }, /* Symbian Application key */
+ { KE_KEY, 0x21, { KEY_UNKNOWN } }, /* Terminal Applicat Ctrl Input */
+ { KE_KEY, 0x23, { KEY_UNKNOWN } }, /* USB Class Switching */
+ { KE_KEY, 0x24, { KEY_MUTE } }, /* Mute */
+ { KE_END, 0 },
+};
+
+#define ECI_KEY_MAX 0x24
+
+/* 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;
+
+static void eci_accessory_event(int event, void *priv);
+
+#ifdef CONFIG_DEBUG_FS
+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(eci->dev->driver->name, 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
+static inline long eci_initialize_debugfs(struct eci_data *eci)
+{
+ return 0;
+}
+
+static void eci_uninitialize_debugfs(void) {}
+#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), "%d\n", eci->plugged);
+}
+
+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);
+ long unsigned int tmp;
+
+ if (strict_strtoul(buf, 0, &tmp))
+ return -EINVAL;
+
+ eci->plugged = !!tmp;
+ if (eci->plugged)
+ eci_accessory_event(ECI_EVENT_PLUG_IN, eci);
+ else
+ 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 > 4)
+ return -EINVAL;
+
+ 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;
+
+ /*
+ * Now that enchancement features table has been parsed,
+ * we can configure ECI buttons.
+ */
+ 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;
+
+ 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";
+
+ err = sparse_keymap_setup(eci->acc_input, eci_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ __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_keymap;
+ }
+
+ /* Must set after input_register_device() to take effect */
+ eci->acc_input->rep[REP_PERIOD] = ECI_KEY_REPEAT_INTERVAL;
+
+ return 0;
+
+err_free_keymap:
+ sparse_keymap_free(eci->acc_input);
+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, 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_KEY_MAX)
+ break;
+ state = (BUTTON_STATE(pin) == ACTIVE_STATE(pin));
+ if (state)
+ dev_dbg(eci->dev, "I/O functionality 0x%02x\n", io_fun);
+
+ sparse_keymap_report_event(eci->acc_input, io_fun, state,
+ false);
+ }
+ 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;
+
+ /* 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__);
+}
+
+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;
+
+ 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:
+ 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);
+
+ 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..0e22404
--- /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@nokia.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;
+ u8 plugged;
+ bool is_eci;
+};
+
+struct eci_cb *eci_register(struct eci_hw_ops *eci_ops);
+#endif
--
1.6.5


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