ASoC: wcd: add audio codec drivers for MSM targets
Add snapshot of audio codec drivers for MSM targets from msm-4.4
kernel at the below commit level-
commit c03f0ace8a36 ("msm: ipa: enable suspend pipe for ODU")
(Kernel TIP as on 12-06-2016)
Change-Id: I80408bd56d3183fdedad427d28f857911e1d7738
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>
diff --git a/drivers/soc/qcom/wcd-dsp-glink.c b/drivers/soc/qcom/wcd-dsp-glink.c
new file mode 100644
index 0000000..3f9f229
--- /dev/null
+++ b/drivers/soc/qcom/wcd-dsp-glink.c
@@ -0,0 +1,1101 @@
+/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/cdev.h>
+#include <linux/platform_device.h>
+#include <soc/qcom/glink.h>
+#include "sound/wcd-dsp-glink.h"
+
+#define WDSP_GLINK_DRIVER_NAME "wcd-dsp-glink"
+#define WDSP_MAX_WRITE_SIZE (512 * 1024)
+#define WDSP_MAX_READ_SIZE (4 * 1024)
+
+#define MINOR_NUMBER_COUNT 1
+#define WDSP_EDGE "wdsp"
+#define RESP_QUEUE_SIZE 3
+#define QOS_PKT_SIZE 1024
+#define TIMEOUT_MS 1000
+
+struct wdsp_glink_dev {
+ struct class *cls;
+ struct device *dev;
+ struct cdev cdev;
+ dev_t dev_num;
+};
+
+struct wdsp_glink_rsp_que {
+ /* Size of valid data in buffer */
+ u32 buf_size;
+
+ /* Response buffer */
+ u8 buf[WDSP_MAX_READ_SIZE];
+};
+
+struct wdsp_glink_tx_buf {
+ struct work_struct tx_work;
+
+ /* Glink channel information */
+ struct wdsp_glink_ch *ch;
+
+ /* Tx buffer to send to glink */
+ u8 buf[0];
+};
+
+struct wdsp_glink_ch {
+ struct wdsp_glink_priv *wpriv;
+
+ /* Glink channel handle */
+ void *handle;
+
+ /* Channel states like connect, disconnect */
+ int channel_state;
+ struct mutex mutex;
+
+ /* To free up the channel memory */
+ bool free_mem;
+
+ /* Glink local channel open work */
+ struct work_struct lcl_ch_open_wrk;
+
+ /* Glink local channel close work */
+ struct work_struct lcl_ch_cls_wrk;
+
+ /* Wait for ch connect state before sending any command */
+ wait_queue_head_t ch_connect_wait;
+
+ /*
+ * Glink channel configuration. This has to be the last
+ * member of the strucuture as it has variable size
+ */
+ struct wdsp_glink_ch_cfg ch_cfg;
+};
+
+struct wdsp_glink_state {
+ /* Glink link state information */
+ enum glink_link_state link_state;
+ void *handle;
+};
+
+struct wdsp_glink_priv {
+ /* Respone buffer related */
+ u8 rsp_cnt;
+ struct wdsp_glink_rsp_que rsp[RESP_QUEUE_SIZE];
+ struct completion rsp_complete;
+ struct mutex rsp_mutex;
+
+ /* Glink channel related */
+ struct mutex glink_mutex;
+ struct wdsp_glink_state glink_state;
+ struct wdsp_glink_ch **ch;
+ u8 no_of_channels;
+ struct work_struct ch_open_cls_wrk;
+ struct workqueue_struct *work_queue;
+
+ wait_queue_head_t link_state_wait;
+
+ struct device *dev;
+};
+
+static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch);
+static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch);
+
+/*
+ * wdsp_glink_notify_rx - Glink notify rx callback for responses
+ * handle: Opaque Channel handle returned by GLink
+ * priv: Private pointer to the channel
+ * pkt_priv: Private pointer to the packet
+ * ptr: Pointer to the Rx data
+ * size: Size of the Rx data
+ */
+static void wdsp_glink_notify_rx(void *handle, const void *priv,
+ const void *pkt_priv, const void *ptr,
+ size_t size)
+{
+ u8 *rx_buf;
+ u8 rsp_cnt;
+ struct wdsp_glink_ch *ch;
+ struct wdsp_glink_priv *wpriv;
+
+ if (!ptr || !priv) {
+ pr_err("%s: Invalid parameters\n", __func__);
+ return;
+ }
+
+ ch = (struct wdsp_glink_ch *)priv;
+ wpriv = ch->wpriv;
+ rx_buf = (u8 *)ptr;
+ if (size > WDSP_MAX_READ_SIZE) {
+ dev_err(wpriv->dev, "%s: Size %zd is greater than allowed %d\n",
+ __func__, size, WDSP_MAX_READ_SIZE);
+ size = WDSP_MAX_READ_SIZE;
+ }
+
+ mutex_lock(&wpriv->rsp_mutex);
+ rsp_cnt = wpriv->rsp_cnt;
+ if (rsp_cnt >= RESP_QUEUE_SIZE) {
+ dev_err(wpriv->dev, "%s: Resp Queue is Full\n", __func__);
+ rsp_cnt = 0;
+ }
+ dev_dbg(wpriv->dev, "%s: copy into buffer %d\n", __func__, rsp_cnt);
+
+ memcpy(wpriv->rsp[rsp_cnt].buf, rx_buf, size);
+ wpriv->rsp[rsp_cnt].buf_size = size;
+ wpriv->rsp_cnt = ++rsp_cnt;
+ mutex_unlock(&wpriv->rsp_mutex);
+
+ glink_rx_done(handle, ptr, true);
+ complete(&wpriv->rsp_complete);
+}
+
+/*
+ * wdsp_glink_notify_tx_done - Glink notify tx done callback to
+ * free tx buffer
+ * handle: Opaque Channel handle returned by GLink
+ * priv: Private pointer to the channel
+ * pkt_priv: Private pointer to the packet
+ * ptr: Pointer to the Tx data
+ */
+static void wdsp_glink_notify_tx_done(void *handle, const void *priv,
+ const void *pkt_priv, const void *ptr)
+{
+ if (!pkt_priv) {
+ pr_err("%s: Invalid parameter\n", __func__);
+ return;
+ }
+ /* Free tx pkt */
+ kfree(pkt_priv);
+}
+
+/*
+ * wdsp_glink_notify_tx_abort - Glink notify tx abort callback to
+ * free tx buffer
+ * handle: Opaque Channel handle returned by GLink
+ * priv: Private pointer to the channel
+ * pkt_priv: Private pointer to the packet
+ */
+static void wdsp_glink_notify_tx_abort(void *handle, const void *priv,
+ const void *pkt_priv)
+{
+ if (!pkt_priv) {
+ pr_err("%s: Invalid parameter\n", __func__);
+ return;
+ }
+ /* Free tx pkt */
+ kfree(pkt_priv);
+}
+
+/*
+ * wdsp_glink_notify_rx_intent_req - Glink notify rx intent request callback
+ * to queue buffer to receive from remote client
+ * handle: Opaque channel handle returned by GLink
+ * priv: Private pointer to the channel
+ * req_size: Size of intent to be queued
+ */
+static bool wdsp_glink_notify_rx_intent_req(void *handle, const void *priv,
+ size_t req_size)
+{
+ struct wdsp_glink_priv *wpriv;
+ struct wdsp_glink_ch *ch;
+ int rc = 0;
+ bool ret = false;
+
+ if (!priv) {
+ pr_err("%s: Invalid priv\n", __func__);
+ goto done;
+ }
+ if (req_size > WDSP_MAX_READ_SIZE) {
+ pr_err("%s: Invalid req_size %zd\n", __func__, req_size);
+ goto done;
+ }
+
+ ch = (struct wdsp_glink_ch *)priv;
+ wpriv = ch->wpriv;
+
+ dev_dbg(wpriv->dev, "%s: intent size %zd requested for ch name %s",
+ __func__, req_size, ch->ch_cfg.name);
+
+ mutex_lock(&ch->mutex);
+ rc = glink_queue_rx_intent(ch->handle, ch, req_size);
+ if (IS_ERR_VALUE(rc)) {
+ dev_err(wpriv->dev, "%s: Failed to queue rx intent, rc = %d\n",
+ __func__, rc);
+ mutex_unlock(&ch->mutex);
+ goto done;
+ }
+ mutex_unlock(&ch->mutex);
+ ret = true;
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_lcl_ch_open_wrk - Work function to open channel again
+ * when local disconnect event happens
+ * work: Work structure
+ */
+static void wdsp_glink_lcl_ch_open_wrk(struct work_struct *work)
+{
+ struct wdsp_glink_ch *ch;
+
+ ch = container_of(work, struct wdsp_glink_ch,
+ lcl_ch_open_wrk);
+
+ wdsp_glink_open_ch(ch);
+}
+
+/*
+ * wdsp_glink_lcl_ch_cls_wrk - Work function to close channel locally
+ * when remote disconnect event happens
+ * work: Work structure
+ */
+static void wdsp_glink_lcl_ch_cls_wrk(struct work_struct *work)
+{
+ struct wdsp_glink_ch *ch;
+
+ ch = container_of(work, struct wdsp_glink_ch,
+ lcl_ch_cls_wrk);
+
+ wdsp_glink_close_ch(ch);
+}
+
+/*
+ * wdsp_glink_notify_state - Glink channel state information event callback
+ * handle: Opaque Channel handle returned by GLink
+ * priv: Private pointer to the channel
+ * event: channel state event
+ */
+static void wdsp_glink_notify_state(void *handle, const void *priv,
+ unsigned int event)
+{
+ struct wdsp_glink_priv *wpriv;
+ struct wdsp_glink_ch *ch;
+ int i, ret = 0;
+
+ if (!priv) {
+ pr_err("%s: Invalid priv\n", __func__);
+ return;
+ }
+
+ ch = (struct wdsp_glink_ch *)priv;
+ wpriv = ch->wpriv;
+
+ mutex_lock(&ch->mutex);
+ ch->channel_state = event;
+ if (event == GLINK_CONNECTED) {
+ dev_dbg(wpriv->dev, "%s: glink channel: %s connected\n",
+ __func__, ch->ch_cfg.name);
+
+ for (i = 0; i < ch->ch_cfg.no_of_intents; i++) {
+ dev_dbg(wpriv->dev, "%s: intent_size = %d\n", __func__,
+ ch->ch_cfg.intents_size[i]);
+ ret = glink_queue_rx_intent(ch->handle, ch,
+ ch->ch_cfg.intents_size[i]);
+ if (IS_ERR_VALUE(ret))
+ dev_warn(wpriv->dev, "%s: Failed to queue intent %d of size %d\n",
+ __func__, i,
+ ch->ch_cfg.intents_size[i]);
+ }
+
+ ret = glink_qos_latency(ch->handle, ch->ch_cfg.latency_in_us,
+ QOS_PKT_SIZE);
+ if (IS_ERR_VALUE(ret))
+ dev_warn(wpriv->dev, "%s: Failed to request qos %d for ch %s\n",
+ __func__, ch->ch_cfg.latency_in_us,
+ ch->ch_cfg.name);
+
+ wake_up(&ch->ch_connect_wait);
+ mutex_unlock(&ch->mutex);
+ } else if (event == GLINK_LOCAL_DISCONNECTED) {
+ /*
+ * Don't use dev_dbg here as dev may not be valid if channel
+ * closed from driver close.
+ */
+ pr_debug("%s: channel: %s disconnected locally\n",
+ __func__, ch->ch_cfg.name);
+ mutex_unlock(&ch->mutex);
+
+ if (ch->free_mem) {
+ kfree(ch);
+ ch = NULL;
+ }
+ } else if (event == GLINK_REMOTE_DISCONNECTED) {
+ dev_dbg(wpriv->dev, "%s: remote channel: %s disconnected remotely\n",
+ __func__, ch->ch_cfg.name);
+ mutex_unlock(&ch->mutex);
+ /*
+ * If remote disconnect happens, local side also has
+ * to close the channel as per glink design in a
+ * separate work_queue.
+ */
+ queue_work(wpriv->work_queue, &ch->lcl_ch_cls_wrk);
+ }
+}
+
+/*
+ * wdsp_glink_close_ch - Internal function to close glink channel
+ * ch: Glink Channel structure.
+ */
+static int wdsp_glink_close_ch(struct wdsp_glink_ch *ch)
+{
+ struct wdsp_glink_priv *wpriv = ch->wpriv;
+ int ret = 0;
+
+ mutex_lock(&wpriv->glink_mutex);
+ if (ch->handle) {
+ ret = glink_close(ch->handle);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(wpriv->dev, "%s: glink_close is failed, ret = %d\n",
+ __func__, ret);
+ } else {
+ ch->handle = NULL;
+ dev_dbg(wpriv->dev, "%s: ch %s is closed\n", __func__,
+ ch->ch_cfg.name);
+ }
+ } else {
+ dev_dbg(wpriv->dev, "%s: ch %s is already closed\n", __func__,
+ ch->ch_cfg.name);
+ }
+ mutex_unlock(&wpriv->glink_mutex);
+
+
+ return ret;
+}
+
+/*
+ * wdsp_glink_open_ch - Internal function to open glink channel
+ * ch: Glink Channel structure.
+ */
+static int wdsp_glink_open_ch(struct wdsp_glink_ch *ch)
+{
+ struct wdsp_glink_priv *wpriv = ch->wpriv;
+ struct glink_open_config open_cfg;
+ int ret = 0;
+
+ mutex_lock(&wpriv->glink_mutex);
+ if (!ch->handle) {
+ memset(&open_cfg, 0, sizeof(open_cfg));
+ open_cfg.options = GLINK_OPT_INITIAL_XPORT;
+ open_cfg.edge = WDSP_EDGE;
+ open_cfg.notify_rx = wdsp_glink_notify_rx;
+ open_cfg.notify_tx_done = wdsp_glink_notify_tx_done;
+ open_cfg.notify_tx_abort = wdsp_glink_notify_tx_abort;
+ open_cfg.notify_state = wdsp_glink_notify_state;
+ open_cfg.notify_rx_intent_req = wdsp_glink_notify_rx_intent_req;
+ open_cfg.priv = ch;
+ open_cfg.name = ch->ch_cfg.name;
+
+ dev_dbg(wpriv->dev, "%s: ch->ch_cfg.name = %s, latency_in_us = %d, intents = %d\n",
+ __func__, ch->ch_cfg.name, ch->ch_cfg.latency_in_us,
+ ch->ch_cfg.no_of_intents);
+
+ ch->handle = glink_open(&open_cfg);
+ if (IS_ERR_OR_NULL(ch->handle)) {
+ dev_err(wpriv->dev, "%s: glink_open failed for ch %s\n",
+ __func__, ch->ch_cfg.name);
+ ch->handle = NULL;
+ ret = -EINVAL;
+ }
+ } else {
+ dev_err(wpriv->dev, "%s: ch %s is already opened\n", __func__,
+ ch->ch_cfg.name);
+ }
+ mutex_unlock(&wpriv->glink_mutex);
+
+ return ret;
+}
+
+/*
+ * wdsp_glink_close_all_ch - Internal function to close all glink channels
+ * wpriv: Wdsp_glink private structure
+ */
+static void wdsp_glink_close_all_ch(struct wdsp_glink_priv *wpriv)
+{
+ int i;
+
+ for (i = 0; i < wpriv->no_of_channels; i++)
+ if (wpriv->ch && wpriv->ch[i])
+ wdsp_glink_close_ch(wpriv->ch[i]);
+}
+
+/*
+ * wdsp_glink_open_all_ch - Internal function to open all glink channels
+ * wpriv: Wdsp_glink private structure
+ */
+static int wdsp_glink_open_all_ch(struct wdsp_glink_priv *wpriv)
+{
+ int ret = 0, i, j;
+
+ for (i = 0; i < wpriv->no_of_channels; i++) {
+ if (wpriv->ch && wpriv->ch[i]) {
+ ret = wdsp_glink_open_ch(wpriv->ch[i]);
+ if (IS_ERR_VALUE(ret))
+ goto err_open;
+ }
+ }
+ goto done;
+
+err_open:
+ for (j = 0; j < i; j++)
+ if (wpriv->ch[i])
+ wdsp_glink_close_ch(wpriv->ch[j]);
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_ch_open_wq - Work function to open glink channels
+ * work: Work structure
+ */
+static void wdsp_glink_ch_open_cls_wrk(struct work_struct *work)
+{
+ struct wdsp_glink_priv *wpriv;
+
+ wpriv = container_of(work, struct wdsp_glink_priv,
+ ch_open_cls_wrk);
+
+ if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) {
+ dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_DOWN\n",
+ __func__);
+
+ wdsp_glink_close_all_ch(wpriv);
+ } else if (wpriv->glink_state.link_state == GLINK_LINK_STATE_UP) {
+ dev_info(wpriv->dev, "%s: GLINK_LINK_STATE_UP\n",
+ __func__);
+
+ wdsp_glink_open_all_ch(wpriv);
+ }
+}
+
+/*
+ * wdsp_glink_link_state_cb - Glink link state callback to inform
+ * about link states
+ * cb_info: Glink link state callback information structure
+ * priv: Private structure of link state passed while register
+ */
+static void wdsp_glink_link_state_cb(struct glink_link_state_cb_info *cb_info,
+ void *priv)
+{
+ struct wdsp_glink_priv *wpriv;
+
+ if (!cb_info || !priv) {
+ pr_err("%s: Invalid parameters\n", __func__);
+ return;
+ }
+
+ wpriv = (struct wdsp_glink_priv *)priv;
+
+ mutex_lock(&wpriv->glink_mutex);
+ wpriv->glink_state.link_state = cb_info->link_state;
+ wake_up(&wpriv->link_state_wait);
+ mutex_unlock(&wpriv->glink_mutex);
+
+ queue_work(wpriv->work_queue, &wpriv->ch_open_cls_wrk);
+}
+
+/*
+ * wdsp_glink_ch_info_init- Internal function to allocate channel memory
+ * and register with glink
+ * wpriv: Wdsp_glink private structure.
+ * pkt: Glink registration packet contains glink channel information.
+ */
+static int wdsp_glink_ch_info_init(struct wdsp_glink_priv *wpriv,
+ struct wdsp_reg_pkt *pkt)
+{
+ int ret = 0, i, j;
+ struct glink_link_info link_info;
+ struct wdsp_glink_ch_cfg *ch_cfg;
+ struct wdsp_glink_ch **ch;
+ u8 no_of_channels;
+ u8 *payload;
+ u32 ch_size, ch_cfg_size;
+
+ payload = (u8 *)pkt->payload;
+ no_of_channels = pkt->no_of_channels;
+
+ ch = kcalloc(no_of_channels, sizeof(struct wdsp_glink_ch *),
+ GFP_KERNEL);
+ if (!ch) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ for (i = 0; i < no_of_channels; i++) {
+ ch_cfg = (struct wdsp_glink_ch_cfg *)payload;
+ ch_cfg_size = sizeof(struct wdsp_glink_ch_cfg) +
+ (sizeof(u32) * ch_cfg->no_of_intents);
+ ch_size = sizeof(struct wdsp_glink_ch) +
+ (sizeof(u32) * ch_cfg->no_of_intents);
+
+ dev_dbg(wpriv->dev, "%s: channels = %d, ch_cfg_size %d",
+ __func__, no_of_channels, ch_cfg_size);
+
+ ch[i] = kzalloc(ch_size, GFP_KERNEL);
+ if (!ch[i]) {
+ ret = -ENOMEM;
+ goto err_ch_mem;
+ }
+ ch[i]->channel_state = GLINK_LOCAL_DISCONNECTED;
+ memcpy(&ch[i]->ch_cfg, payload, ch_cfg_size);
+ payload += ch_cfg_size;
+
+ mutex_init(&ch[i]->mutex);
+ ch[i]->wpriv = wpriv;
+ INIT_WORK(&ch[i]->lcl_ch_open_wrk, wdsp_glink_lcl_ch_open_wrk);
+ INIT_WORK(&ch[i]->lcl_ch_cls_wrk, wdsp_glink_lcl_ch_cls_wrk);
+ init_waitqueue_head(&ch[i]->ch_connect_wait);
+ }
+ wpriv->ch = ch;
+ wpriv->no_of_channels = no_of_channels;
+
+ INIT_WORK(&wpriv->ch_open_cls_wrk, wdsp_glink_ch_open_cls_wrk);
+
+ /* Register glink link_state notification */
+ link_info.glink_link_state_notif_cb = wdsp_glink_link_state_cb;
+ link_info.transport = NULL;
+ link_info.edge = WDSP_EDGE;
+
+ wpriv->glink_state.link_state = GLINK_LINK_STATE_DOWN;
+ wpriv->glink_state.handle = glink_register_link_state_cb(&link_info,
+ wpriv);
+ if (!wpriv->glink_state.handle) {
+ dev_err(wpriv->dev, "%s: Unable to register wdsp link state\n",
+ __func__);
+ ret = -EINVAL;
+ goto err_ch_mem;
+ }
+ goto done;
+
+err_ch_mem:
+ for (j = 0; j < i; j++) {
+ mutex_destroy(&ch[j]->mutex);
+ kfree(wpriv->ch[j]);
+ wpriv->ch[j] = NULL;
+ }
+ kfree(wpriv->ch);
+ wpriv->ch = NULL;
+ wpriv->no_of_channels = 0;
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_tx_buf_work - Work queue function to send tx buffer to glink
+ * work: Work structure
+ */
+static void wdsp_glink_tx_buf_work(struct work_struct *work)
+{
+ struct wdsp_glink_priv *wpriv;
+ struct wdsp_glink_ch *ch;
+ struct wdsp_glink_tx_buf *tx_buf;
+ struct wdsp_write_pkt *wpkt;
+ struct wdsp_cmd_pkt *cpkt;
+ int ret = 0;
+
+ tx_buf = container_of(work, struct wdsp_glink_tx_buf,
+ tx_work);
+ ch = tx_buf->ch;
+ wpriv = ch->wpriv;
+ wpkt = (struct wdsp_write_pkt *)tx_buf->buf;
+ cpkt = (struct wdsp_cmd_pkt *)wpkt->payload;
+ dev_dbg(wpriv->dev, "%s: ch name = %s, payload size = %d\n",
+ __func__, cpkt->ch_name, cpkt->payload_size);
+
+ mutex_lock(&tx_buf->ch->mutex);
+ if (ch->channel_state == GLINK_CONNECTED) {
+ mutex_unlock(&tx_buf->ch->mutex);
+ ret = glink_tx(ch->handle, tx_buf,
+ cpkt->payload, cpkt->payload_size,
+ GLINK_TX_REQ_INTENT);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(wpriv->dev, "%s: glink tx failed, ret = %d\n",
+ __func__, ret);
+ /*
+ * If glink_tx() is failed then free tx_buf here as
+ * there won't be any tx_done notification to
+ * free the buffer.
+ */
+ kfree(tx_buf);
+ }
+ } else {
+ mutex_unlock(&tx_buf->ch->mutex);
+ dev_err(wpriv->dev, "%s: channel %s is not in connected state\n",
+ __func__, ch->ch_cfg.name);
+ /*
+ * Free tx_buf here as there won't be any tx_done
+ * notification in this case also.
+ */
+ kfree(tx_buf);
+ }
+}
+
+/*
+ * wdsp_glink_read - Read API to send the data to userspace
+ * file: Pointer to the file structure
+ * buf: Pointer to the userspace buffer
+ * count: Number bytes to read from the file
+ * ppos: Pointer to the position into the file
+ */
+static ssize_t wdsp_glink_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int ret = 0, ret1 = 0;
+ struct wdsp_glink_rsp_que *rsp;
+ struct wdsp_glink_priv *wpriv;
+
+ wpriv = (struct wdsp_glink_priv *)file->private_data;
+ if (!wpriv) {
+ pr_err("%s: Invalid private data\n", __func__);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ if (count > WDSP_MAX_READ_SIZE) {
+ dev_info(wpriv->dev, "%s: count = %zd is more than WDSP_MAX_READ_SIZE\n",
+ __func__, count);
+ count = WDSP_MAX_READ_SIZE;
+ }
+ /*
+ * Complete signal has given from glink rx notification callback
+ * or from flush API. Also use interruptible wait_for_completion API
+ * to allow the system to go in suspend.
+ */
+ ret = wait_for_completion_interruptible(&wpriv->rsp_complete);
+ if (ret)
+ goto done;
+
+ mutex_lock(&wpriv->rsp_mutex);
+ if (wpriv->rsp_cnt) {
+ wpriv->rsp_cnt--;
+ dev_dbg(wpriv->dev, "%s: read from buffer %d\n",
+ __func__, wpriv->rsp_cnt);
+
+ rsp = &wpriv->rsp[wpriv->rsp_cnt];
+ if (count < rsp->buf_size) {
+ ret1 = copy_to_user(buf, &rsp->buf, count);
+ /* Return the number of bytes copied */
+ ret = count;
+ } else {
+ ret1 = copy_to_user(buf, &rsp->buf, rsp->buf_size);
+ /* Return the number of bytes copied */
+ ret = rsp->buf_size;
+ }
+
+ if (ret1) {
+ mutex_unlock(&wpriv->rsp_mutex);
+ dev_err(wpriv->dev, "%s: copy_to_user failed %d\n",
+ __func__, ret);
+ ret = -EFAULT;
+ goto done;
+ }
+ } else {
+ /*
+ * This will execute only if flush API is called or
+ * something wrong with ref_cnt
+ */
+ dev_dbg(wpriv->dev, "%s: resp count = %d\n", __func__,
+ wpriv->rsp_cnt);
+ ret = -EINVAL;
+ }
+ mutex_unlock(&wpriv->rsp_mutex);
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_write - Write API to receive the data from userspace
+ * file: Pointer to the file structure
+ * buf: Pointer to the userspace buffer
+ * count: Number bytes to read from the file
+ * ppos: Pointer to the position into the file
+ */
+static ssize_t wdsp_glink_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int ret = 0, i, tx_buf_size;
+ struct wdsp_write_pkt *wpkt;
+ struct wdsp_cmd_pkt *cpkt;
+ struct wdsp_glink_tx_buf *tx_buf;
+ struct wdsp_glink_priv *wpriv;
+
+ wpriv = (struct wdsp_glink_priv *)file->private_data;
+ if (!wpriv) {
+ pr_err("%s: Invalid private data\n", __func__);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ dev_dbg(wpriv->dev, "%s: count = %zd\n", __func__, count);
+
+ if (count > WDSP_MAX_WRITE_SIZE) {
+ dev_info(wpriv->dev, "%s: count = %zd is more than WDSP_MAX_WRITE_SIZE\n",
+ __func__, count);
+ count = WDSP_MAX_WRITE_SIZE;
+ }
+
+ tx_buf_size = count + sizeof(struct wdsp_glink_tx_buf);
+ tx_buf = kzalloc(tx_buf_size, GFP_KERNEL);
+ if (!tx_buf) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ ret = copy_from_user(tx_buf->buf, buf, count);
+ if (ret) {
+ dev_err(wpriv->dev, "%s: copy_from_user failed %d\n",
+ __func__, ret);
+ ret = -EFAULT;
+ goto free_buf;
+ }
+
+ wpkt = (struct wdsp_write_pkt *)tx_buf->buf;
+ switch (wpkt->pkt_type) {
+ case WDSP_REG_PKT:
+ ret = wdsp_glink_ch_info_init(wpriv,
+ (struct wdsp_reg_pkt *)wpkt->payload);
+ if (IS_ERR_VALUE(ret))
+ dev_err(wpriv->dev, "%s: glink register failed, ret = %d\n",
+ __func__, ret);
+ kfree(tx_buf);
+ break;
+ case WDSP_READY_PKT:
+ ret = wait_event_timeout(wpriv->link_state_wait,
+ (wpriv->glink_state.link_state ==
+ GLINK_LINK_STATE_UP),
+ msecs_to_jiffies(TIMEOUT_MS));
+ if (!ret) {
+ dev_err(wpriv->dev, "%s: Link state wait timeout\n",
+ __func__);
+ ret = -ETIMEDOUT;
+ goto free_buf;
+ }
+ ret = 0;
+ kfree(tx_buf);
+ break;
+ case WDSP_CMD_PKT:
+ mutex_lock(&wpriv->glink_mutex);
+ if (wpriv->glink_state.link_state == GLINK_LINK_STATE_DOWN) {
+ mutex_unlock(&wpriv->glink_mutex);
+ dev_err(wpriv->dev, "%s: Link state is Down\n",
+ __func__);
+
+ ret = -ENETRESET;
+ goto free_buf;
+ }
+ mutex_unlock(&wpriv->glink_mutex);
+
+ cpkt = (struct wdsp_cmd_pkt *)wpkt->payload;
+ dev_dbg(wpriv->dev, "%s: requested ch_name: %s\n", __func__,
+ cpkt->ch_name);
+ for (i = 0; i < wpriv->no_of_channels; i++) {
+ if (wpriv->ch && wpriv->ch[i] &&
+ (!strcmp(cpkt->ch_name,
+ wpriv->ch[i]->ch_cfg.name))) {
+ tx_buf->ch = wpriv->ch[i];
+ break;
+ }
+ }
+ if (!tx_buf->ch) {
+ dev_err(wpriv->dev, "%s: Failed to get glink channel\n",
+ __func__);
+ ret = -EINVAL;
+ goto free_buf;
+ }
+
+ ret = wait_event_timeout(tx_buf->ch->ch_connect_wait,
+ (tx_buf->ch->channel_state ==
+ GLINK_CONNECTED),
+ msecs_to_jiffies(TIMEOUT_MS));
+ if (!ret) {
+ dev_err(wpriv->dev, "%s: glink channel %s is not in connected state %d\n",
+ __func__, tx_buf->ch->ch_cfg.name,
+ tx_buf->ch->channel_state);
+ ret = -ETIMEDOUT;
+ goto free_buf;
+ }
+ ret = 0;
+
+ INIT_WORK(&tx_buf->tx_work, wdsp_glink_tx_buf_work);
+ queue_work(wpriv->work_queue, &tx_buf->tx_work);
+ break;
+ default:
+ dev_err(wpriv->dev, "%s: Invalid packet type\n", __func__);
+ ret = -EINVAL;
+ kfree(tx_buf);
+ break;
+ }
+ goto done;
+
+free_buf:
+ kfree(tx_buf);
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_open - Open API to initialize private data
+ * inode: Pointer to the inode structure
+ * file: Pointer to the file structure
+ */
+static int wdsp_glink_open(struct inode *inode, struct file *file)
+{
+ int ret = 0;
+ struct wdsp_glink_priv *wpriv;
+ struct wdsp_glink_dev *wdev;
+
+ if (!inode->i_cdev) {
+ pr_err("%s: cdev is NULL\n", __func__);
+ ret = -EINVAL;
+ goto done;
+ }
+ wdev = container_of(inode->i_cdev, struct wdsp_glink_dev, cdev);
+
+ wpriv = kzalloc(sizeof(struct wdsp_glink_priv), GFP_KERNEL);
+ if (!wpriv) {
+ ret = -ENOMEM;
+ goto done;
+ }
+ wpriv->dev = wdev->dev;
+ wpriv->work_queue = create_singlethread_workqueue("wdsp_glink_wq");
+ if (!wpriv->work_queue) {
+ dev_err(wpriv->dev, "%s: Error creating wdsp_glink_wq\n",
+ __func__);
+ ret = -EINVAL;
+ goto err_wq;
+ }
+
+ init_completion(&wpriv->rsp_complete);
+ init_waitqueue_head(&wpriv->link_state_wait);
+ mutex_init(&wpriv->rsp_mutex);
+ mutex_init(&wpriv->glink_mutex);
+ file->private_data = wpriv;
+
+ goto done;
+
+err_wq:
+ kfree(wpriv);
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_flush - Flush API to unblock read.
+ * file: Pointer to the file structure
+ * id: Lock owner ID
+ */
+static int wdsp_glink_flush(struct file *file, fl_owner_t id)
+{
+ struct wdsp_glink_priv *wpriv;
+
+ wpriv = (struct wdsp_glink_priv *)file->private_data;
+ if (!wpriv) {
+ pr_err("%s: Invalid private data\n", __func__);
+ return -EINVAL;
+ }
+
+ complete(&wpriv->rsp_complete);
+
+ return 0;
+}
+
+/*
+ * wdsp_glink_release - Release API to clean up resources.
+ * Whenever a file structure is shared across multiple threads,
+ * release won't be invoked until all copies are closed
+ * (file->f_count.counter should be 0). If we need to flush pending
+ * data when any copy is closed, you should implement the flush method.
+ *
+ * inode: Pointer to the inode structure
+ * file: Pointer to the file structure
+ */
+static int wdsp_glink_release(struct inode *inode, struct file *file)
+{
+ int i, ret = 0;
+ struct wdsp_glink_priv *wpriv;
+
+ wpriv = (struct wdsp_glink_priv *)file->private_data;
+ if (!wpriv) {
+ pr_err("%s: Invalid private data\n", __func__);
+ ret = -EINVAL;
+ goto done;
+ }
+
+ if (wpriv->glink_state.handle)
+ glink_unregister_link_state_cb(wpriv->glink_state.handle);
+
+ flush_workqueue(wpriv->work_queue);
+ destroy_workqueue(wpriv->work_queue);
+
+ /*
+ * Clean up glink channel memory in channel state
+ * callback only if close channels are called from here.
+ */
+ if (wpriv->ch) {
+ for (i = 0; i < wpriv->no_of_channels; i++) {
+ if (wpriv->ch[i]) {
+ wpriv->ch[i]->free_mem = true;
+ /*
+ * Channel handle NULL means channel is already
+ * closed. Free the channel memory here itself.
+ */
+ if (!wpriv->ch[i]->handle) {
+ kfree(wpriv->ch[i]);
+ wpriv->ch[i] = NULL;
+ } else {
+ wdsp_glink_close_ch(wpriv->ch[i]);
+ }
+ }
+ }
+
+ kfree(wpriv->ch);
+ wpriv->ch = NULL;
+ }
+
+ mutex_destroy(&wpriv->glink_mutex);
+ mutex_destroy(&wpriv->rsp_mutex);
+ kfree(wpriv);
+ file->private_data = NULL;
+
+done:
+ return ret;
+}
+
+static const struct file_operations wdsp_glink_fops = {
+ .owner = THIS_MODULE,
+ .open = wdsp_glink_open,
+ .read = wdsp_glink_read,
+ .write = wdsp_glink_write,
+ .flush = wdsp_glink_flush,
+ .release = wdsp_glink_release,
+};
+
+/*
+ * wdsp_glink_probe - Driver probe to expose char device
+ * pdev: Pointer to device tree data.
+ */
+static int wdsp_glink_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct wdsp_glink_dev *wdev;
+
+ wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
+ if (!wdev) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ ret = alloc_chrdev_region(&wdev->dev_num, 0, MINOR_NUMBER_COUNT,
+ WDSP_GLINK_DRIVER_NAME);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(&pdev->dev, "%s: Failed to alloc char dev, err = %d\n",
+ __func__, ret);
+ goto err_chrdev;
+ }
+
+ wdev->cls = class_create(THIS_MODULE, WDSP_GLINK_DRIVER_NAME);
+ if (IS_ERR(wdev->cls)) {
+ ret = PTR_ERR(wdev->cls);
+ dev_err(&pdev->dev, "%s: Failed to create class, err = %d\n",
+ __func__, ret);
+ goto err_class;
+ }
+
+ wdev->dev = device_create(wdev->cls, NULL, wdev->dev_num,
+ NULL, WDSP_GLINK_DRIVER_NAME);
+ if (IS_ERR(wdev->dev)) {
+ ret = PTR_ERR(wdev->dev);
+ dev_err(&pdev->dev, "%s: Failed to create device, err = %d\n",
+ __func__, ret);
+ goto err_dev_create;
+ }
+
+ cdev_init(&wdev->cdev, &wdsp_glink_fops);
+ ret = cdev_add(&wdev->cdev, wdev->dev_num, MINOR_NUMBER_COUNT);
+ if (IS_ERR_VALUE(ret)) {
+ dev_err(&pdev->dev, "%s: Failed to register char dev, err = %d\n",
+ __func__, ret);
+ goto err_cdev_add;
+ }
+ platform_set_drvdata(pdev, wdev);
+ goto done;
+
+err_cdev_add:
+ device_destroy(wdev->cls, wdev->dev_num);
+
+err_dev_create:
+ class_destroy(wdev->cls);
+
+err_class:
+ unregister_chrdev_region(0, MINOR_NUMBER_COUNT);
+
+err_chrdev:
+ devm_kfree(&pdev->dev, wdev);
+
+done:
+ return ret;
+}
+
+/*
+ * wdsp_glink_remove - Driver remove to handle cleanup
+ * pdev: Pointer to device tree data.
+ */
+static int wdsp_glink_remove(struct platform_device *pdev)
+{
+ struct wdsp_glink_dev *wdev = platform_get_drvdata(pdev);
+
+ if (wdev) {
+ cdev_del(&wdev->cdev);
+ device_destroy(wdev->cls, wdev->dev_num);
+ class_destroy(wdev->cls);
+ unregister_chrdev_region(0, MINOR_NUMBER_COUNT);
+ devm_kfree(&pdev->dev, wdev);
+ } else {
+ dev_err(&pdev->dev, "%s: Invalid device data\n", __func__);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id wdsp_glink_of_match[] = {
+ {.compatible = "qcom,wcd-dsp-glink"},
+ { }
+};
+MODULE_DEVICE_TABLE(of, wdsp_glink_of_match);
+
+static struct platform_driver wdsp_glink_driver = {
+ .probe = wdsp_glink_probe,
+ .remove = wdsp_glink_remove,
+ .driver = {
+ .name = WDSP_GLINK_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = wdsp_glink_of_match,
+ },
+};
+
+module_platform_driver(wdsp_glink_driver);
+
+MODULE_DESCRIPTION("SoC WCD_DSP GLINK Driver");
+MODULE_LICENSE("GPL v2");