From: Kai Vehmanen <kai.vehmanen@xxxxxxxxx>
Introduces the cmt-speech driver, which implements
a character device interface for transferring speech
data frames over HSI/SSI.
The driver is used to exchange voice/speech data between
the Nokia N900/N950/N9's modem and its cpu.
Signed-off-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxx>
Signed-off-by: Carlos Chinea <carlos.chinea@xxxxxxxxx>
Signed-off-by: Joni Lapilainen <joni.lapilainen@xxxxxxxxx>
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
---
drivers/hsi/clients/cmt_speech.c | 1426 ++++++++++++++++++++++++++++++++++++++
include/linux/cs-protocol.h | 116 ++++
2 files changed, 1542 insertions(+)
create mode 100644 drivers/hsi/clients/cmt_speech.c
create mode 100644 include/linux/cs-protocol.h
diff --git a/drivers/hsi/clients/cmt_speech.c b/drivers/hsi/clients/cmt_speech.c
new file mode 100644
index 0000000..7c0f711
--- /dev/null
+++ b/drivers/hsi/clients/cmt_speech.c
@@ -0,0 +1,1426 @@
+/*
+ * cmt_speech.c - HSI CMT speech driver
+ *
+ * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Kai Vehmanen <kai.vehmanen@xxxxxxxxx>
+ * Original author: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
+ *
+ * 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
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/ioctl.h>
+#include <linux/uaccess.h>
+#include <linux/pm_qos_params.h>
+#include <linux/hsi/hsi.h>
+#include <linux/hsi/ssip_slave.h>
+#include <linux/cs-protocol.h>
+
+#define CS_MMAP_SIZE PAGE_SIZE
+#define DRIVER_NAME "cmt_speech"
+
+struct char_queue {
+ struct list_head list;
+ u32 msg;
+};
+
+struct cs_char {
+ unsigned int opened;
+ struct hsi_client *cl;
+ struct cs_hsi_iface *hi;
+ struct list_head chardev_queue;
+ struct list_head dataind_queue;
+ int dataind_pending;
+ /* mmap things */
+ unsigned long mmap_base;
+ unsigned long mmap_size;
+ spinlock_t lock;
+ struct fasync_struct *async_queue;
+ wait_queue_head_t wait;
+};
+
+#define SSI_CHANNEL_STATE_READING 1
+#define SSI_CHANNEL_STATE_WRITING (1 << 1)
+#define SSI_CHANNEL_STATE_POLL (1 << 2)
+#define SSI_CHANNEL_STATE_ERROR (1 << 3)
+
+#define CONTROL_HSI_CH 1
+#define DATA_HSI_CH 2
+
+#define TARGET_MASK 0xf000000
+#define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT)
+#define TARGET_LOCAL 0
+
+/* Number of pre-allocated commands buffers */
+#define CS_MAX_CMDS 4
+
+/*
+ * During data transfers, transactions must be handled
+ * within 20ms (fixed value in cmtspeech HSI protocol)
+ */
+#define CS_QOS_LATENCY_FOR_DATA_USEC 20000
+
+/* Timeout to wait for pending HSI transfers to complete */
+#define CS_HSI_TRANSFER_TIMEOUT_MS 500
+
+
+#define RX_PTR_BOUNDARY_SHIFT 8
+#define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \
+ CS_MAX_BUFFERS_SHIFT)
+struct cs_hsi_iface {
+ struct hsi_client *cl;
+ struct hsi_client *master;
+
+ unsigned int iface_state;
+ unsigned int wakeline_state;
+ unsigned int control_state;
+ unsigned int data_state;
+
+ /* state exposed to application */
+ struct cs_mmap_config_block *mmap_cfg;
+
+ unsigned long mmap_base;
+ unsigned long mmap_size;
+
+ unsigned int rx_slot;
+ unsigned int tx_slot;
+
+ /* note: for security reasons, we do not trust the contents of
+ * mmap_cfg, but instead duplicate the variables here */
+ unsigned int buf_size;
+ unsigned int rx_bufs;
+ unsigned int tx_bufs;
+ unsigned int rx_ptr_boundary;
+ unsigned int rx_offsets[CS_MAX_BUFFERS];
+ unsigned int tx_offsets[CS_MAX_BUFFERS];
+ /* size of aligned memory blocks */
+ unsigned int slot_size;
+ unsigned int flags;
+
+ struct list_head cmdqueue;
+
+ struct hsi_msg *data_rx_msg;
+ struct hsi_msg *data_tx_msg;
+ wait_queue_head_t datawait;
+
+ struct pm_qos_request_list pm_qos_req;
+
+ spinlock_t lock;
+};
+
+static struct cs_char cs_char_data;
+
+static void cs_hsi_read_on_control(struct cs_hsi_iface *hi);
+static void cs_hsi_read_on_data(struct cs_hsi_iface *hi);
+
+static inline void rx_ptr_shift_too_big(void)
+{
+ BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX);
+}
+
+static void cs_notify(u32 message, struct list_head *head)
+{
+ struct char_queue *entry;
+
+ spin_lock(&cs_char_data.lock);
+
+ if (!cs_char_data.opened) {
+ spin_unlock(&cs_char_data.lock);
+ goto out;
+ }
+
+ entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+ if (!entry) {
+ dev_err(&cs_char_data.cl->device,
+ "Can't allocate new entry for the queue.\n");
+ spin_unlock(&cs_char_data.lock);
+ goto out;
+ }
+
+ entry->msg = message;
+ list_add_tail(&entry->list, head);
+
+ spin_unlock(&cs_char_data.lock);
+
+ wake_up_interruptible(&cs_char_data.wait);
+ kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN);
+
+out:
+ return;
+}
+
+static u32 cs_pop_entry(struct list_head *head)
+{
+ struct char_queue *entry;
+ u32 data;
+
+ entry = list_entry(head->next, struct char_queue, list);
+ data = entry->msg;
+ list_del(&entry->list);
+ kfree(entry);
+
+ return data;
+}
+
+static void cs_notify_control(u32 message)
+{
+ cs_notify(message, &cs_char_data.chardev_queue);
+}
+
+static void cs_notify_data(u32 message, int maxlength)
+{
+ cs_notify(message, &cs_char_data.dataind_queue);
+
+ spin_lock(&cs_char_data.lock);
+ ++cs_char_data.dataind_pending;
+ while (cs_char_data.dataind_pending > maxlength &&
+ !list_empty(&cs_char_data.dataind_queue)) {
+ dev_dbg(&cs_char_data.cl->device, "data notification "
+ "queue overrun (%u entries)\n", cs_char_data.dataind_pending);
+
+ cs_pop_entry(&cs_char_data.dataind_queue);
+ --cs_char_data.dataind_pending;
+ }
+ spin_unlock(&cs_char_data.lock);
+}
+
+static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd)
+{
+ u32 *data;
+
+ data = sg_virt(msg->sgt.sgl);
+ *data = cmd;
+}
+
+static inline u32 cs_get_cmd(struct hsi_msg *msg)
+{
+ u32 *data;
+
+ data = sg_virt(msg->sgt.sgl);
+
+ return *data;
+}
+
+static void cs_release_cmd(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ list_add_tail(&msg->link, &hi->cmdqueue);
+}
+
+static void cs_cmd_destructor(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ spin_lock(&hi->lock);
+
+ dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n");
+
+ if (hi->iface_state != CS_STATE_CLOSED)
+ dev_err(&hi->cl->device, "Cmd flushed while driver active\n");
+
+ if (msg->ttype == HSI_MSG_READ)
+ hi->control_state &=
+ ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
+ else if (msg->ttype == HSI_MSG_WRITE &&
+ hi->control_state & SSI_CHANNEL_STATE_WRITING)
+ hi->control_state &= ~SSI_CHANNEL_STATE_WRITING;
+
+ cs_release_cmd(msg);
+
+ spin_unlock(&hi->lock);
+}
+
+static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi)
+{
+ struct hsi_msg *msg;
+
+ BUG_ON(list_empty(&ssi->cmdqueue));
+
+ msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
+ list_del(&msg->link);
+ msg->destructor = cs_cmd_destructor;
+
+ return msg;
+}
+
+static void cs_free_cmds(struct cs_hsi_iface *ssi)
+{
+ struct hsi_msg *msg, *tmp;
+
+ list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
+ list_del(&msg->link);
+ msg->destructor = NULL;
+ kfree(sg_virt(msg->sgt.sgl));
+ hsi_free_msg(msg);
+ }
+}
+
+static int cs_alloc_cmds(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *msg;
+ u32 *buf;
+ unsigned int i;
+
+ INIT_LIST_HEAD(&hi->cmdqueue);
+
+ for (i = 0; i < CS_MAX_CMDS; i++) {
+ msg = hsi_alloc_msg(1, GFP_ATOMIC);
+ if (!msg)
+ goto out;
+ buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
+ if (!buf) {
+ hsi_free_msg(msg);
+ goto out;
+ }
+ sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
+ msg->channel = CONTROL_HSI_CH;
+ msg->context = hi;
+ list_add_tail(&msg->link, &hi->cmdqueue);
+ }
+
+ return 0;
+
+out:
+ cs_free_cmds(hi);
+ return -ENOMEM;
+}
+
+static void cs_hsi_data_destructor(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX";
+
+ dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir);
+
+ spin_lock(&hi->lock);
+ if (hi->iface_state != CS_STATE_CLOSED)
+ dev_err(&cs_char_data.cl->device,
+ "Data %s flush while device active\n", dir);
+ if (msg->ttype == HSI_MSG_READ)
+ hi->data_state &=
+ ~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
+ else
+ hi->data_state &= ~SSI_CHANNEL_STATE_WRITING;
+
+ msg->status = HSI_STATUS_COMPLETED;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+
+ spin_unlock(&hi->lock);
+}
+
+static int cs_hsi_alloc_data(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *txmsg, *rxmsg;
+ int res = 0;
+
+ rxmsg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!rxmsg) {
+ res = -ENOMEM;
+ goto out1;
+ }
+ rxmsg->channel = DATA_HSI_CH;
+ rxmsg->destructor = cs_hsi_data_destructor;
+ rxmsg->context = hi;
+
+ txmsg = hsi_alloc_msg(1, GFP_KERNEL);
+ if (!txmsg) {
+ res = -ENOMEM;
+ goto out2;
+ }
+ txmsg->channel = DATA_HSI_CH;
+ txmsg->destructor = cs_hsi_data_destructor;
+ txmsg->context = hi;
+
+ hi->data_rx_msg = rxmsg;
+ hi->data_tx_msg = txmsg;
+
+ return 0;
+
+out2:
+ hsi_free_msg(rxmsg);
+out1:
+ return res;
+}
+
+static void cs_hsi_free_data_msg(struct hsi_msg *msg)
+{
+ WARN_ON(msg->status != HSI_STATUS_COMPLETED &&
+ msg->status != HSI_STATUS_ERROR);
+ hsi_free_msg(msg);
+}
+
+static void cs_hsi_free_data(struct cs_hsi_iface *hi)
+{
+ cs_hsi_free_data_msg(hi->data_rx_msg);
+ cs_hsi_free_data_msg(hi->data_tx_msg);
+}
+
+static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg, const char *info,
+ unsigned int *state)
+{
+ spin_lock(&hi->lock);
+ dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n",
+ info, msg->status, *state);
+}
+
+static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi)
+{
+ spin_unlock(&hi->lock);
+}
+
+static inline void __cs_hsi_error_read_bits(unsigned int *state)
+{
+ *state |= SSI_CHANNEL_STATE_ERROR;
+ *state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL);
+}
+
+static inline void __cs_hsi_error_write_bits(unsigned int *state)
+{
+ *state |= SSI_CHANNEL_STATE_ERROR;
+ *state &= ~SSI_CHANNEL_STATE_WRITING;
+}
+
+static void cs_hsi_control_read_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "control read", &hi->control_state);
+ cs_release_cmd(msg);
+ __cs_hsi_error_read_bits(&hi->control_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_control_write_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "control write", &hi->control_state);
+ cs_release_cmd(msg);
+ __cs_hsi_error_write_bits(&hi->control_state);
+ __cs_hsi_error_post(hi);
+
+}
+
+static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "data read", &hi->data_state);
+ __cs_hsi_error_read_bits(&hi->data_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_data_write_error(struct cs_hsi_iface *hi,
+ struct hsi_msg *msg)
+{
+ __cs_hsi_error_pre(hi, msg, "data write", &hi->data_state);
+ __cs_hsi_error_write_bits(&hi->data_state);
+ __cs_hsi_error_post(hi);
+}
+
+static void cs_hsi_read_on_control_complete(struct hsi_msg *msg)
+{
+ u32 cmd = cs_get_cmd(msg);
+ struct cs_hsi_iface *hi = msg->context;
+
+ spin_lock(&hi->lock);
+ hi->control_state &= ~SSI_CHANNEL_STATE_READING;
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&hi->cl->device, "Control RX error detected\n");
+ cs_hsi_control_read_error(hi, msg);
+ spin_unlock(&hi->lock);
+ goto out;
+ }
+ dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd);
+ cs_release_cmd(msg);
+ if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) {
+ struct timespec *tstamp =
+ &hi->mmap_cfg->tstamp_rx_ctrl;
+ do_posix_clock_monotonic_gettime(tstamp);
+ }
+ spin_unlock(&hi->lock);
+
+ cs_notify_control(cmd);
+
+out:
+ cs_hsi_read_on_control(hi);
+}
+
+static void cs_hsi_peek_on_control_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ int ret;
+
+ if (msg->status == HSI_STATUS_ERROR) {
+ dev_err(&hi->cl->device, "Control peek RX error detected\n");
+ cs_hsi_control_read_error(hi, msg);
+ return;
+ }
+
+ WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING));
+
+ dev_dbg(&hi->cl->device, "Peek on control complete, reading\n");
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_read_on_control_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_control_read_error(hi, msg);
+}
+
+static void cs_hsi_read_on_control(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *msg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->control_state & SSI_CHANNEL_STATE_READING) {
+ dev_err(&hi->cl->device, "Control read already pending (%d)\n",
+ hi->control_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ if (hi->control_state & SSI_CHANNEL_STATE_ERROR) {
+ dev_err(&hi->cl->device, "Control read error (%d)\n",
+ hi->control_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ hi->control_state |= SSI_CHANNEL_STATE_READING;
+ dev_dbg(&hi->cl->device, "Issuing RX on control\n");
+ msg = cs_claim_cmd(hi);
+ spin_unlock(&hi->lock);
+
+ msg->sgt.nents = 0;
+ msg->complete = cs_hsi_peek_on_control_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_control_read_error(hi, msg);
+}
+
+static void cs_hsi_write_on_control_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ if (msg->status == HSI_STATUS_COMPLETED) {
+ spin_lock(&hi->lock);
+ hi->control_state &= ~SSI_CHANNEL_STATE_WRITING;
+ cs_release_cmd(msg);
+ spin_unlock(&hi->lock);
+ } else if (msg->status == HSI_STATUS_ERROR) {
+ cs_hsi_control_write_error(hi, msg);
+ } else {
+ dev_err(&hi->cl->device,
+ "unexpected status in control write callback %d\n",
+ msg->status);
+ }
+}
+
+static int cs_hsi_write_on_control(struct cs_hsi_iface *hi, u32 message)
+{
+ struct hsi_msg *msg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->control_state & SSI_CHANNEL_STATE_ERROR) {
+ spin_unlock(&hi->lock);
+ return -EIO;
+ }
+ if (hi->control_state & SSI_CHANNEL_STATE_WRITING) {
+ dev_err(&hi->cl->device,
+ "Write still pending on control channel.\n");
+ spin_unlock(&hi->lock);
+ return -EBUSY;
+ }
+ hi->control_state |= SSI_CHANNEL_STATE_WRITING;
+ msg = cs_claim_cmd(hi);
+ spin_unlock(&hi->lock);
+
+ cs_set_cmd(msg, message);
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_write_on_control_complete;
+ dev_dbg(&hi->cl->device,
+ "Sending control message %08X\n", message);
+ ret = hsi_async_write(hi->cl, msg);
+ if (ret) {
+ dev_err(&hi->cl->device,
+ "async_write failed with %d\n", ret);
+ cs_hsi_control_write_error(hi, msg);
+ }
+
+ /*
+ * Make sure control read is always pending when issuing
+ * new control writes. This is needed as the controller
+ * may flush our messages if e.g. the peer device reboots
+ * unexpectedly (and we cannot directly resubmit a new read from
+ * the message destructor; see cs_cmd_destructor()).
+ */
+ if (!(hi->control_state & SSI_CHANNEL_STATE_READING)) {
+ dev_err(&hi->cl->device, "Restarting control reads\n");
+ cs_hsi_read_on_control(hi);
+ }
+
+ return 0;
+}
+
+static void cs_hsi_read_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ u32 payload;
+
+ if (unlikely(msg->status == HSI_STATUS_ERROR)) {
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+
+ spin_lock(&hi->lock);
+ WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_READING));
+ hi->data_state &= ~SSI_CHANNEL_STATE_READING;
+ payload = CS_RX_DATA_RECEIVED;
+ payload |= hi->rx_slot;
+ hi->rx_slot++;
+ hi->rx_slot %= hi->rx_ptr_boundary;
+ /* expose current rx ptr in mmap area */
+ hi->mmap_cfg->rx_ptr = hi->rx_slot;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+ spin_unlock(&hi->lock);
+
+ cs_notify_data(payload, hi->rx_bufs);
+ cs_hsi_read_on_data(hi);
+}
+
+static void cs_hsi_peek_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+ u32 *address;
+ int ret;
+
+ if (unlikely(msg->status == HSI_STATUS_ERROR)) {
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+ if (unlikely(hi->iface_state != CS_STATE_CONFIGURED)) {
+ dev_err(&hi->cl->device, "Data received in invalid state\n");
+ cs_hsi_data_read_error(hi, msg);
+ return;
+ }
+
+ spin_lock(&hi->lock);
+ WARN_ON(!(hi->data_state & SSI_CHANNEL_STATE_POLL));
+ hi->data_state &= ~SSI_CHANNEL_STATE_POLL;
+ hi->data_state |= SSI_CHANNEL_STATE_READING;
+ spin_unlock(&hi->lock);
+
+ address = (u32 *)(hi->mmap_base +
+ hi->rx_offsets[hi->rx_slot % hi->rx_bufs]);
+ sg_init_one(msg->sgt.sgl, address, hi->buf_size);
+ msg->sgt.nents = 1;
+ msg->complete = cs_hsi_read_on_data_complete;
+ ret = hsi_async_read(hi->cl, msg);
+ if (ret)
+ cs_hsi_data_read_error(hi, msg);
+}
+
+/**
+ * Read/write transaction is ongoing. Returns false if in
+ * SSI_CHANNEL_STATE_POLL state.
+ */
+static inline int cs_state_xfer_active(unsigned int state)
+{
+ return (state & SSI_CHANNEL_STATE_WRITING) ||
+ (state & SSI_CHANNEL_STATE_READING);
+}
+
+/**
+ * No pending read/writes
+ */
+static inline int cs_state_idle(unsigned int state)
+{
+ return !(state & ~SSI_CHANNEL_STATE_ERROR);
+}
+
+static void cs_hsi_read_on_data(struct cs_hsi_iface *hi)
+{
+ struct hsi_msg *rxmsg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->data_state &
+ (SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL)) {
+ dev_dbg(&hi->cl->device, "Data read already pending (%u)\n",
+ hi->data_state);
+ spin_unlock(&hi->lock);
+ return;
+ }
+ hi->data_state |= SSI_CHANNEL_STATE_POLL;
+ spin_unlock(&hi->lock);
+
+ rxmsg = hi->data_rx_msg;
+ sg_init_one(rxmsg->sgt.sgl, (void *)hi->mmap_base, 0);
+ rxmsg->sgt.nents = 0;
+ rxmsg->complete = cs_hsi_peek_on_data_complete;
+
+ ret = hsi_async_read(hi->cl, rxmsg);
+ if (ret)
+ cs_hsi_data_read_error(hi, rxmsg);
+}
+
+static void cs_hsi_write_on_data_complete(struct hsi_msg *msg)
+{
+ struct cs_hsi_iface *hi = msg->context;
+
+ if (msg->status == HSI_STATUS_COMPLETED) {
+ spin_lock(&hi->lock);
+ hi->data_state &= ~SSI_CHANNEL_STATE_WRITING;
+ if (unlikely(waitqueue_active(&hi->datawait)))
+ wake_up_interruptible(&hi->datawait);
+ spin_unlock(&hi->lock);
+ } else {
+ cs_hsi_data_write_error(hi, msg);
+ }
+}
+
+static int cs_hsi_write_on_data(struct cs_hsi_iface *hi, unsigned int slot)
+{
+ u32 *address;
+ struct hsi_msg *txmsg;
+ int ret;
+
+ spin_lock(&hi->lock);
+ if (hi->iface_state != CS_STATE_CONFIGURED) {
+ dev_err(&hi->cl->device, "Not configured, aborting\n");
+ ret = -EINVAL;
+ goto error;
+ }
+ if (hi->data_state & SSI_CHANNEL_STATE_ERROR) {
+ dev_err(&hi->cl->device, "HSI error, aborting\n");
+ ret = -EIO;
+ goto error;
+ }
+ if (hi->data_state & SSI_CHANNEL_STATE_WRITING) {
+ dev_err(&hi->cl->device, "Write pending on data channel.\n");
+ ret = -EBUSY;
+ goto error;
+ }
+ hi->data_state |= SSI_CHANNEL_STATE_WRITING;
+ spin_unlock(&hi->lock);
+
+ hi->tx_slot = slot;
+ address = (u32 *)(hi->mmap_base + hi->tx_offsets[hi->tx_slot]);
+ txmsg = hi->data_tx_msg;
+ sg_init_one(txmsg->sgt.sgl, address, hi->buf_size);
+ txmsg->complete = cs_hsi_write_on_data_complete;
+ ret = hsi_async_write(hi->cl, txmsg);
+ if (ret)
+ cs_hsi_data_write_error(hi, txmsg);
+
+ return ret;
+
+error:
+ spin_unlock(&hi->lock);
+ if (ret == -EIO)
+ cs_hsi_data_write_error(hi, hi->data_tx_msg);
+
+ return ret;
+}
+
+static unsigned int cs_hsi_get_state(struct cs_hsi_iface *hi)
+{
+ return hi->iface_state;
+}
+
+static int cs_hsi_command(struct cs_hsi_iface *hi, u32 cmd)
+{
+ int ret = 0;
+
+ local_bh_disable();
+ switch (cmd & TARGET_MASK) {
+ case TARGET_REMOTE:
+ ret = cs_hsi_write_on_control(hi, cmd);
+ break;
+ case TARGET_LOCAL:
+ if ((cmd & CS_CMD_MASK) == CS_TX_DATA_READY)
+ ret = cs_hsi_write_on_data(hi, cmd & CS_PARAM_MASK);
+ else
+ ret = -EINVAL;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ local_bh_enable();
+
+ return ret;
+}
+
+static void cs_hsi_set_wakeline(struct cs_hsi_iface *hi,
+ unsigned int new_state)
+{
+ int change = 0;
+
+ spin_lock_bh(&hi->lock);
+ if (hi->wakeline_state != new_state) {
+ hi->wakeline_state = new_state;
+ change = 1;
+ dev_dbg(&hi->cl->device, "setting wake line to %d (%p)\n",
+ new_state, hi->cl);
+ }
+ spin_unlock_bh(&hi->lock);
+
+ if (change) {
+ if (new_state)
+ ssip_slave_start_tx(hi->master);
+ else
+ ssip_slave_stop_tx(hi->master);
+ }
+
+ dev_dbg(&hi->cl->device, "wake line set to %d (%p)\n",
+ new_state, hi->cl);
+}
+
+static void set_buffer_sizes(struct cs_hsi_iface *hi, int rx_bufs, int tx_bufs)
+{
+ hi->rx_bufs = rx_bufs;
+ hi->tx_bufs = tx_bufs;
+ hi->mmap_cfg->rx_bufs = rx_bufs;
+ hi->mmap_cfg->tx_bufs = tx_bufs;
+
+ if (hi->flags & CS_FEAT_ROLLING_RX_COUNTER) {
+ /*
+ * For more robust overrun detection, let the rx
+ * pointer run in range 0..'boundary-1'. Boundary
+ * is a multiple of rx_bufs, and limited in max size
+ * by RX_PTR_MAX_SHIFT to allow for fast ptr-diff
+ * calculation.
+ */
+ hi->rx_ptr_boundary = (rx_bufs << RX_PTR_BOUNDARY_SHIFT);
+ hi->mmap_cfg->rx_ptr_boundary = hi->rx_ptr_boundary;
+ } else {
+ hi->rx_ptr_boundary = hi->rx_bufs;
+ }
+}
+
+static int check_buf_params(struct cs_hsi_iface *hi,
+ const struct cs_buffer_config *buf_cfg)
+{
+ size_t buf_size_aligned = L1_CACHE_ALIGN(buf_cfg->buf_size) *
+ (buf_cfg->rx_bufs + buf_cfg->tx_bufs);
+ size_t ctrl_size_aligned = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg));
+ int r = 0;
+
+ if (buf_cfg->rx_bufs > CS_MAX_BUFFERS ||
+ buf_cfg->tx_bufs > CS_MAX_BUFFERS) {
+ r = -EINVAL;
+ } else if ((buf_size_aligned + ctrl_size_aligned) >= hi->mmap_size) {
+ dev_err(&hi->cl->device, "No space for the requested buffer "
+ "configuration\n");
+ r = -ENOBUFS;
+ }
+
+ return r;
+}
+
+/**
+ * Block until pending data transfers have completed.
+ */
+static int cs_hsi_data_sync(struct cs_hsi_iface *hi)
+{
+ int r = 0;
+
+ spin_lock_bh(&hi->lock);
+
+ if (!cs_state_xfer_active(hi->data_state)) {
+ dev_dbg(&hi->cl->device, "hsi_data_sync break, idle\n");
+ goto out;
+ }
+
+ for (;;) {
+ int s;
+ DEFINE_WAIT(wait);
+ if (!cs_state_xfer_active(hi->data_state))
+ goto out;
+ if (signal_pending(current)) {
+ r = -ERESTARTSYS;
+ goto out;
+ }
+ /**
+ * prepare_to_wait must be called with hi->lock held
+ * so that callbacks can check for waitqueue_active()
+ */
+ prepare_to_wait(&hi->datawait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&hi->lock);
+ s = schedule_timeout(
+ msecs_to_jiffies(CS_HSI_TRANSFER_TIMEOUT_MS));
+ spin_lock_bh(&hi->lock);
+ finish_wait(&hi->datawait, &wait);
+ if (!s) {
+ dev_dbg(&hi->cl->device,
+ "hsi_data_sync timeout after %d ms\n",
+ CS_HSI_TRANSFER_TIMEOUT_MS);
+ r = -EIO;
+ goto out;
+ }
+ }
+
+out:
+ spin_unlock_bh(&hi->lock);
+ dev_dbg(&hi->cl->device, "hsi_data_sync done with res %d\n", r);
+
+ return r;
+}
+
+static void cs_hsi_data_enable(struct cs_hsi_iface *hi,
+ struct cs_buffer_config *buf_cfg)
+{
+ unsigned int data_start, i;
+
+ BUG_ON(hi->buf_size == 0);
+
+ set_buffer_sizes(hi, buf_cfg->rx_bufs, buf_cfg->tx_bufs);
+
+ hi->slot_size = L1_CACHE_ALIGN(hi->buf_size);
+ dev_dbg(&hi->cl->device,
+ "setting slot size to %u, buf size %u, align %u\n",
+ hi->slot_size, hi->buf_size, L1_CACHE_BYTES);
+
+ data_start = L1_CACHE_ALIGN(sizeof(*hi->mmap_cfg));
+ dev_dbg(&hi->cl->device,
+ "setting data start at %u, cfg block %u, align %u\n",
+ data_start, sizeof(*hi->mmap_cfg), L1_CACHE_BYTES);
+
+ for (i = 0; i < hi->mmap_cfg->rx_bufs; i++) {
+ hi->rx_offsets[i] = data_start + i * hi->slot_size;
+ hi->mmap_cfg->rx_offsets[i] = hi->rx_offsets[i];
+ dev_dbg(&hi->cl->device, "DL buf #%u at %u\n",
+ i, hi->rx_offsets[i]);
+ }
+ for (i = 0; i < hi->mmap_cfg->tx_bufs; i++) {
+ hi->tx_offsets[i] = data_start +
+ (i + hi->mmap_cfg->rx_bufs) * hi->slot_size;
+ hi->mmap_cfg->tx_offsets[i] = hi->tx_offsets[i];
+ dev_dbg(&hi->cl->device, "UL buf #%u at %u\n",
+ i, hi->rx_offsets[i]);
+ }
+
+ hi->iface_state = CS_STATE_CONFIGURED;
+}
+
+static void cs_hsi_data_disable(struct cs_hsi_iface *hi, int old_state)
+{
+ if (old_state == CS_STATE_CONFIGURED) {
+ dev_dbg(&hi->cl->device,
+ "closing data channel with slot size 0\n");
+ hi->iface_state = CS_STATE_OPENED;
+ }
+}
+
+static int cs_hsi_buf_config(struct cs_hsi_iface *hi,
+ struct cs_buffer_config *buf_cfg)
+{
+ int r = 0;
+ unsigned int old_state = hi->iface_state;
+
+ spin_lock_bh(&hi->lock);
+ /* Prevent new transactions during buffer reconfig */
+ if (old_state == CS_STATE_CONFIGURED)
+ hi->iface_state = CS_STATE_OPENED;
+ spin_unlock_bh(&hi->lock);
+
+ /*
+ * make sure that no non-zero data reads are ongoing before
+ * proceeding to change the buffer layout
+ */
+ r = cs_hsi_data_sync(hi);
+ if (r < 0)
+ return r;
+
+ WARN_ON(cs_state_xfer_active(hi->data_state));
+
+ spin_lock_bh(&hi->lock);
+ r = check_buf_params(hi, buf_cfg);
+ if (r < 0)
+ goto error;
+
+ hi->buf_size = buf_cfg->buf_size;
+ hi->mmap_cfg->buf_size = hi->buf_size;
+ hi->flags = buf_cfg->flags;
+
+ hi->rx_slot = 0;
+ hi->tx_slot = 0;
+ hi->slot_size = 0;
+
+ if (hi->buf_size)
+ cs_hsi_data_enable(hi, buf_cfg);
+ else
+ cs_hsi_data_disable(hi, old_state);
+
+ spin_unlock_bh(&hi->lock);
+
+ if (old_state != hi->iface_state) {
+ if (hi->iface_state == CS_STATE_CONFIGURED) {
+ pm_qos_add_request(&hi->pm_qos_req,
+ PM_QOS_CPU_DMA_LATENCY,
+ CS_QOS_LATENCY_FOR_DATA_USEC);
+ local_bh_disable();
+ cs_hsi_read_on_data(hi);
+ local_bh_enable();
+ } else if (old_state == CS_STATE_CONFIGURED) {
+ pm_qos_remove_request(&hi->pm_qos_req);
+ }
+ }
+ return r;
+
+error:
+ spin_unlock_bh(&hi->lock);
+ return r;
+}
+
+static int cs_hsi_start(struct cs_hsi_iface **hi, struct hsi_client *cl,
+ unsigned long mmap_base, unsigned long mmap_size)
+{
+ int err = 0;
+ struct cs_hsi_iface *hsi_if = kzalloc(sizeof(*hsi_if), GFP_KERNEL);
+
+ dev_dbg(&cl->device, "cs_hsi_start\n");
+
+ if (!hsi_if) {
+ err = -ENOMEM;
+ goto leave0;
+ }
+ spin_lock_init(&hsi_if->lock);
+ hsi_if->cl = cl;
+ hsi_if->iface_state = CS_STATE_CLOSED;
+ hsi_if->mmap_cfg = (struct cs_mmap_config_block *)mmap_base;
+ hsi_if->mmap_base = mmap_base;
+ hsi_if->mmap_size = mmap_size;
+ memset(hsi_if->mmap_cfg, 0, sizeof(*hsi_if->mmap_cfg));
+ init_waitqueue_head(&hsi_if->datawait);
+ err = cs_alloc_cmds(hsi_if);
+ if (err < 0) {
+ dev_err(&cl->device, "Unable to alloc HSI messages\n");
+ goto leave1;
+ }
+ err = cs_hsi_alloc_data(hsi_if);
+ if (err < 0) {
+ dev_err(&cl->device, "Unable to alloc HSI messages for data\n");
+ goto leave2;
+ }
+ err = hsi_claim_port(cl, 1);
+ if (err < 0) {
+ dev_err(&cl->device,
+ "Could not open, HSI port already claimed\n");
+ goto leave3;
+ }
+ hsi_if->master = ssip_slave_get_master(cl);
+ if (IS_ERR(hsi_if->master)) {
+ dev_err(&cl->device, "Could not get HSI master client\n");
+ goto leave4;
+ }
+ hsi_if->iface_state = CS_STATE_OPENED;
+ local_bh_disable();
+ cs_hsi_read_on_control(hsi_if);
+ local_bh_enable();
+
+ dev_dbg(&cl->device, "cs_hsi_start...done\n");
+
+ BUG_ON(!hi);
+ *hi = hsi_if;
+
+ return 0;
+
+leave4:
+ hsi_release_port(cl);
+leave3:
+ cs_hsi_free_data(hsi_if);
+leave2:
+ cs_free_cmds(hsi_if);
+leave1:
+ kfree(hsi_if);
+leave0:
+ dev_dbg(&cl->device, "cs_hsi_start...done/error\n\n");
+
+ return err;
+}
+
+static void cs_hsi_stop(struct cs_hsi_iface *hi)
+{
+ dev_dbg(&hi->cl->device, "cs_hsi_stop\n");
+ cs_hsi_set_wakeline(hi, 0);
+ ssip_slave_put_master(hi->master);
+
+ /* hsi_release_port() needs to be called with CS_STATE_CLOSED */
+ hi->iface_state = CS_STATE_CLOSED;
+ hsi_release_port(hi->cl);
+
+ /*
+ * hsi_release_port() should flush out all the pending
+ * messages, so cs_state_idle() should be true for both
+ * control and data channels.
+ */
+ WARN_ON(!cs_state_idle(hi->control_state));
+ WARN_ON(!cs_state_idle(hi->data_state));
+
+ if (pm_qos_request_active(&hi->pm_qos_req))
+ pm_qos_remove_request(&hi->pm_qos_req);
+
+ spin_lock_bh(&hi->lock);
+ cs_hsi_free_data(hi);
+ cs_free_cmds(hi);
+ spin_unlock_bh(&hi->lock);
+ kfree(hi);
+}
+
+static int cs_char_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct cs_char *csdata = vma->vm_private_data;
+ struct page *page;
+
+ page = virt_to_page(csdata->mmap_base);
+ get_page(page);
+ vmf->page = page;
+
+ return 0;
+}
+
+static struct vm_operations_struct cs_char_vm_ops = {
+ .fault = cs_char_vma_fault,
+};
+
+static int cs_char_fasync(int fd, struct file *file, int on)
+{
+ struct cs_char *csdata = file->private_data;
+
+ if (fasync_helper(fd, file, on, &csdata->async_queue) >= 0)
+ return 0;
+ else
+ return -EIO;
+}
+
+static unsigned int cs_char_poll(struct file *file, poll_table *wait)
+{
+ struct cs_char *csdata = file->private_data;
+ unsigned int ret = 0;
+
+ poll_wait(file, &cs_char_data.wait, wait);
+ spin_lock_bh(&csdata->lock);
+ if (!list_empty(&csdata->chardev_queue))
+ ret = POLLIN | POLLRDNORM;
+ else if (!list_empty(&csdata->dataind_queue))
+ ret = POLLIN | POLLRDNORM;
+ spin_unlock_bh(&csdata->lock);
+
+ return ret;
+}
+
+static ssize_t cs_char_read(struct file *file, char __user *buf, size_t count,
+ loff_t *unused)
+{
+ struct cs_char *csdata = file->private_data;
+ u32 data;
+ ssize_t retval;
+
+ if (count < sizeof(data))
+ return -EINVAL;
+
+ for ( ; ; ) {
+ DEFINE_WAIT(wait);
+
+ spin_lock_bh(&csdata->lock);
+ if (!list_empty(&csdata->chardev_queue)) {
+ data = cs_pop_entry(&csdata->chardev_queue);
+ } else if (!list_empty(&csdata->dataind_queue)) {
+ data = cs_pop_entry(&csdata->dataind_queue);
+ --csdata->dataind_pending;
+
+ } else {
+ data = 0;
+ }
+ spin_unlock_bh(&csdata->lock);
+
+ if (data)
+ break;
+ if (file->f_flags & O_NONBLOCK) {
+ retval = -EAGAIN;
+ goto out;
+ } else if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ goto out;
+ }
+ prepare_to_wait_exclusive(&csdata->wait, &wait,
+ TASK_INTERRUPTIBLE);
+ schedule();
+ finish_wait(&csdata->wait, &wait);
+ }
+
+ retval = put_user(data, (u32 __user *)buf);
+ if (!retval)
+ retval = sizeof(data);
+
+out:
+ return retval;
+}
+
+static ssize_t cs_char_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *unused)
+{
+ struct cs_char *csdata = file->private_data;
+ u32 data;
+ int err;
+ ssize_t retval;
+
+ if (count < sizeof(data))
+ return -EINVAL;
+
+ if (get_user(data, (u32 __user *)buf))
+ retval = -EFAULT;
+ else
+ retval = count;
+
+ err = cs_hsi_command(csdata->hi, data);
+ if (err < 0)
+ retval = err;
+
+ return retval;
+}
+
+static long cs_char_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct cs_char *csdata = file->private_data;
+ int r = 0;
+
+ switch (cmd) {
+ case CS_GET_STATE: {
+ unsigned int state;
+
+ state = cs_hsi_get_state(csdata->hi);
+ if (copy_to_user((void __user *)arg, &state, sizeof(state)))
+ r = -EFAULT;
+ }
+ break;
+ case CS_SET_WAKELINE: {
+ unsigned int state;
+
+ if (copy_from_user(&state, (void __user *)arg, sizeof(state)))
+ r = -EFAULT;
+ else
+ cs_hsi_set_wakeline(csdata->hi, state);
+ }
+ break;
+ case CS_GET_IF_VERSION: {
+ unsigned int ifver = CS_IF_VERSION;
+
+ if (copy_to_user((void __user *)arg, &ifver, sizeof(ifver)))
+ r = -EFAULT;
+ break;
+ }
+ case CS_CONFIG_BUFS: {
+ struct cs_buffer_config buf_cfg;
+
+ if (copy_from_user(&buf_cfg, (void __user *)arg,
+ sizeof(buf_cfg)))
+ r = -EFAULT;
+ else
+ r = cs_hsi_buf_config(csdata->hi, &buf_cfg);
+ break;
+ }
+ default:
+ r = -ENOTTY;
+ break;
+ }
+
+ return r;
+}
+
+static int cs_char_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+
+ if (((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) != 1)
+ return -EINVAL;
+
+ vma->vm_flags |= VM_RESERVED;
+ vma->vm_ops = &cs_char_vm_ops;
+ vma->vm_private_data = file->private_data;
+
+ return 0;
+}
+
+static int cs_char_open(struct inode *unused, struct file *file)
+{
+ int ret = 0;
+
+ spin_lock_bh(&cs_char_data.lock);
+ if (cs_char_data.opened) {
+ ret = -EBUSY;
+ spin_unlock_bh(&cs_char_data.lock);
+ goto out;
+ }
+ cs_char_data.mmap_base = get_zeroed_page(GFP_ATOMIC);
+ if (!cs_char_data.mmap_base) {
+ dev_err(&cs_char_data.cl->device,
+ "Shared memory allocation failed.\n");
+ ret = -ENOMEM;
+ spin_unlock_bh(&cs_char_data.lock);
+ goto out;
+ }
+ cs_char_data.mmap_size = CS_MMAP_SIZE;
+ cs_char_data.dataind_pending = 0;
+ cs_char_data.opened = 1;
+ file->private_data = &cs_char_data;
+ spin_unlock_bh(&cs_char_data.lock);
+
+ BUG_ON(cs_char_data.hi);
+
+ ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl,
+ cs_char_data.mmap_base, cs_char_data.mmap_size);
+ if (ret) {
+ dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n");
+ free_page(cs_char_data.mmap_base);
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static void cs_free_char_queue(struct list_head *head)
+{
+ struct char_queue *entry;
+ struct list_head *cursor, *next;
+
+ if (!list_empty(head)) {
+ list_for_each_safe(cursor, next, head) {
+ entry = list_entry(cursor, struct char_queue, list);
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ }
+
+}
+
+static int cs_char_release(struct inode *unused, struct file *file)
+{
+ struct cs_char *csdata = file->private_data;
+
+ cs_hsi_stop(csdata->hi);
+ spin_lock_bh(&csdata->lock);
+ csdata->hi = NULL;
+ free_page(csdata->mmap_base);
+ cs_free_char_queue(&csdata->chardev_queue);
+ cs_free_char_queue(&csdata->dataind_queue);
+ csdata->opened = 0;
+ spin_unlock_bh(&csdata->lock);
+
+ return 0;
+}
+
+static const struct file_operations cs_char_fops = {
+ .owner = THIS_MODULE,
+ .read = cs_char_read,
+ .write = cs_char_write,
+ .poll = cs_char_poll,
+ .unlocked_ioctl = cs_char_ioctl,
+ .mmap = cs_char_mmap,
+ .open = cs_char_open,
+ .release = cs_char_release,
+ .fasync = cs_char_fasync,
+};
+
+static struct miscdevice cs_char_miscdev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = DRIVER_NAME,
+ .fops = &cs_char_fops
+};
+
+static int __init cs_hsi_client_probe(struct device *dev)
+{
+ int err = 0;
+ struct hsi_client *cl = to_hsi_client(dev);
+
+ dev_dbg(dev, "hsi_client_probe\n");
+ init_waitqueue_head(&cs_char_data.wait);
+ spin_lock_init(&cs_char_data.lock);
+ cs_char_data.opened = 0;
+ cs_char_data.cl = cl;
+ cs_char_data.hi = NULL;
+ INIT_LIST_HEAD(&cs_char_data.chardev_queue);
+ INIT_LIST_HEAD(&cs_char_data.dataind_queue);
+
+ err = misc_register(&cs_char_miscdev);
+ if (err)
+ dev_err(dev, "Failed to register\n");
+
+ return err;
+}
+
+static int __exit cs_hsi_client_remove(struct device *dev)
+{
+ struct cs_hsi_iface *hi;
+
+ dev_dbg(dev, "hsi_client_remove\n");
+ misc_deregister(&cs_char_miscdev);
+ spin_lock_bh(&cs_char_data.lock);
+ hi = cs_char_data.hi;
+ cs_char_data.hi = NULL;
+ spin_unlock_bh(&cs_char_data.lock);
+ if (hi)
+ cs_hsi_stop(hi);
+
+ return 0;
+}
+
+static struct hsi_client_driver cs_hsi_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .probe = cs_hsi_client_probe,
+ .remove = cs_hsi_client_remove,
+ },
+};
+
+static int __init cs_char_init(void)
+{
+ int err = 0;
+
+ err = hsi_register_client_driver(&cs_hsi_driver);
+ if (err)
+ pr_err(DRIVER_NAME ": Error when registering driver %d\n", err);
+
+ return err;
+}
+module_init(cs_char_init);
+
+static void __exit cs_char_exit(void)
+{
+ hsi_unregister_client_driver(&cs_hsi_driver);
+}
+module_exit(cs_char_exit);
+
+MODULE_ALIAS("hsi:cmt_speech");
+MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@xxxxxxxxx>");
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>");
+MODULE_DESCRIPTION("CMT speech driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/cs-protocol.h b/include/linux/cs-protocol.h
new file mode 100644
index 0000000..0d3d584
--- /dev/null
+++ b/include/linux/cs-protocol.h
@@ -0,0 +1,116 @@
+/*
+ * include/linux/cs-protocol.h - cmt_speech interface definitions
+ *
+ * Implemented by:
+ * - drivers/misc/cmt-speech/
+ *
+ * Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Kai Vehmanen <kai.vehmanen@xxxxxxxxx>
+ * Original author: Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx>
+ *
+ * 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 _CS_PROTOCOL_H
+#define _CS_PROTOCOL_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+/* chardev parameters */
+#define CS_DEV_FILE_NAME "/dev/cmt_speech"
+
+/* user-space API versioning */
+#define CS_IF_VERSION 2
+
+/* APE kernel <-> user space messages */
+#define CS_CMD_SHIFT 28
+#define CS_DOMAIN_SHIFT 24
+
+#define CS_CMD_MASK 0xff000000
+#define CS_PARAM_MASK 0xffffff
+
+#define CS_CMD(id, dom) \
+ (((id) << CS_CMD_SHIFT) | ((dom) << CS_DOMAIN_SHIFT))
+
+#define CS_ERROR CS_CMD(1, 0)
+#define CS_RX_DATA_RECEIVED CS_CMD(2, 0)
+#define CS_TX_DATA_READY CS_CMD(3, 0)
+#define CS_TX_DATA_SENT CS_CMD(4, 0)
+
+/* params to CS_ERROR indication */
+#define CS_ERR_PEER_RESET 0
+
+/* ioctl interface */
+
+/* parameters to CS_CONFIG_BUFS ioctl */
+#define CS_FEAT_TSTAMP_RX_CTRL (1 << 0)
+#define CS_FEAT_ROLLING_RX_COUNTER (2 << 0)
+
+/* parameters to CS_GET_STATE ioctl */
+#define CS_STATE_CLOSED 0
+#define CS_STATE_OPENED 1 /* resource allocated */
+#define CS_STATE_CONFIGURED 2 /* data path active */
+
+/* maximum number of TX/RX buffers */
+#define CS_MAX_BUFFERS_SHIFT 4
+#define CS_MAX_BUFFERS (1 << CS_MAX_BUFFERS_SHIFT)
+
+/* Parameters for setting up the data buffers */
+struct cs_buffer_config {
+ __u32 rx_bufs; /* number of RX buffer slots */
+ __u32 tx_bufs; /* number of TX buffer slots */
+ __u32 buf_size; /* bytes */
+ __u32 flags; /* see CS_FEAT_* */
+ __u32 reserved[4];
+};
+
+/*
+ * Struct describing the layout and contents of the driver mmap area.
+ * This information is meant as read-only information for the application.
+ */
+struct cs_mmap_config_block {
+ __u32 reserved1;
+ __u32 buf_size; /* 0=disabled, otherwise the transfer size */
+ __u32 rx_bufs; /* # of RX buffers */
+ __u32 tx_bufs; /* # of TX buffers */
+ __u32 reserved2;
+ /* array of offsets within the mmap area for each RX and TX buffer */
+ __u32 rx_offsets[CS_MAX_BUFFERS];
+ __u32 tx_offsets[CS_MAX_BUFFERS];
+ __u32 rx_ptr;
+ __u32 rx_ptr_boundary;
+ __u32 reserved3[2];
+ /*
+ * if enabled with CS_FEAT_TSTAMP_RX_CTRL, monotonic
+ * timestamp taken when the last control command was received
+ */
+ struct timespec tstamp_rx_ctrl;
+};
+
+#define CS_IO_MAGIC 'C'
+
+#define CS_IOW(num, dtype) _IOW(CS_IO_MAGIC, num, dtype)
+#define CS_IOR(num, dtype) _IOR(CS_IO_MAGIC, num, dtype)
+#define CS_IOWR(num, dtype) _IOWR(CS_IO_MAGIC, num, dtype)
+#define CS_IO(num) _IO(CS_IO_MAGIC, num)
+
+#define CS_GET_STATE CS_IOR(21, unsigned int)
+#define CS_SET_WAKELINE CS_IOW(23, unsigned int)
+#define CS_GET_IF_VERSION CS_IOR(30, unsigned int)
+#define CS_CONFIG_BUFS CS_IOW(31, struct cs_buffer_config)
+
+#endif /* _CS_PROTOCOL_H */
--
2.1.4
--
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