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*
* interface to "audmgr" service on the baseband cpu
*
* Copyright (C) 2008 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/module.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/kthread.h>
#include <linux/wait.h>
#include <asm/atomic.h>
#include <mach/msm_rpcrouter.h>
#include "audmgr.h"
#define STATE_CLOSED 0
#define STATE_DISABLED 1
#define STATE_ENABLING 2
#define STATE_ENABLED 3
#define STATE_DISABLING 4
#define STATE_ERROR 5
static void rpc_ack(struct msm_rpc_endpoint *ept, uint32_t xid)
{
uint32_t rep[6];
rep[0] = cpu_to_be32(xid);
rep[1] = cpu_to_be32(1);
rep[2] = cpu_to_be32(RPCMSG_REPLYSTAT_ACCEPTED);
rep[3] = cpu_to_be32(RPC_ACCEPTSTAT_SUCCESS);
rep[4] = 0;
rep[5] = 0;
msm_rpc_write(ept, rep, sizeof(rep));
}
static void process_audmgr_callback(struct audmgr *am,
struct rpc_audmgr_cb_func_ptr *args,
int len)
{
if (len < (sizeof(uint32_t) * 3))
return;
if (be32_to_cpu(args->set_to_one) != 1)
return;
switch (be32_to_cpu(args->status)) {
case RPC_AUDMGR_STATUS_READY:
if (len < sizeof(uint32_t) * 4)
break;
am->handle = be32_to_cpu(args->u.handle);
pr_info("audmgr: rpc READY handle=0x%08x\n", am->handle);
break;
case RPC_AUDMGR_STATUS_CODEC_CONFIG: {
uint32_t volume;
if (len < sizeof(uint32_t) * 4)
break;
volume = be32_to_cpu(args->u.volume);
pr_info("audmgr: rpc CODEC_CONFIG volume=0x%08x\n", volume);
am->state = STATE_ENABLED;
wake_up(&am->wait);
break;
}
case RPC_AUDMGR_STATUS_PENDING:
pr_err("audmgr: PENDING?\n");
break;
case RPC_AUDMGR_STATUS_SUSPEND:
pr_err("audmgr: SUSPEND?\n");
break;
case RPC_AUDMGR_STATUS_FAILURE:
pr_err("audmgr: FAILURE\n");
break;
case RPC_AUDMGR_STATUS_VOLUME_CHANGE:
pr_err("audmgr: VOLUME_CHANGE?\n");
break;
case RPC_AUDMGR_STATUS_DISABLED:
pr_err("audmgr: DISABLED\n");
am->state = STATE_DISABLED;
wake_up(&am->wait);
break;
case RPC_AUDMGR_STATUS_ERROR:
pr_err("audmgr: ERROR?\n");
am->state = STATE_ERROR;
wake_up(&am->wait);
break;
default:
break;
}
}
static void process_rpc_request(uint32_t proc, uint32_t xid,
void *data, int len, void *private)
{
struct audmgr *am = private;
uint32_t *x = data;
if (0) {
int n = len / 4;
pr_info("rpc_call proc %d:", proc);
while (n--)
printk(" %08x", be32_to_cpu(*x++));
printk("\n");
}
if (proc == AUDMGR_CB_FUNC_PTR)
process_audmgr_callback(am, data, len);
else
pr_err("audmgr: unknown rpc proc %d\n", proc);
rpc_ack(am->ept, xid);
}
#define RPC_TYPE_REQUEST 0
#define RPC_TYPE_REPLY 1
#define RPC_VERSION 2
#define RPC_COMMON_HDR_SZ (sizeof(uint32_t) * 2)
#define RPC_REQUEST_HDR_SZ (sizeof(struct rpc_request_hdr))
#define RPC_REPLY_HDR_SZ (sizeof(uint32_t) * 3)
#define RPC_REPLY_SZ (sizeof(uint32_t) * 6)
static int audmgr_rpc_thread(void *data)
{
struct audmgr *am = data;
struct rpc_request_hdr *hdr = NULL;
uint32_t type;
int len;
pr_info("audmgr_rpc_thread() start\n");
while (!kthread_should_stop()) {
if (hdr) {
kfree(hdr);
hdr = NULL;
}
len = msm_rpc_read(am->ept, (void **) &hdr, -1, -1);
if (len < 0) {
pr_err("audmgr: rpc read failed (%d)\n", len);
break;
}
if (len < RPC_COMMON_HDR_SZ)
continue;
type = be32_to_cpu(hdr->type);
if (type == RPC_TYPE_REPLY) {
struct rpc_reply_hdr *rep = (void *) hdr;
uint32_t status;
if (len < RPC_REPLY_HDR_SZ)
continue;
status = be32_to_cpu(rep->reply_stat);
if (status == RPCMSG_REPLYSTAT_ACCEPTED) {
status = be32_to_cpu(rep->data.acc_hdr.accept_stat);
pr_info("audmgr: rpc_reply status %d\n", status);
} else {
pr_info("audmgr: rpc_reply denied!\n");
}
/* process reply */
continue;
}
if (len < RPC_REQUEST_HDR_SZ)
continue;
process_rpc_request(be32_to_cpu(hdr->procedure),
be32_to_cpu(hdr->xid),
(void *) (hdr + 1),
len - sizeof(*hdr),
data);
}
pr_info("audmgr_rpc_thread() exit\n");
if (hdr) {
kfree(hdr);
hdr = NULL;
}
am->task = NULL;
wake_up(&am->wait);
return 0;
}
struct audmgr_enable_msg {
struct rpc_request_hdr hdr;
struct rpc_audmgr_enable_client_args args;
};
struct audmgr_disable_msg {
struct rpc_request_hdr hdr;
uint32_t handle;
};
int audmgr_open(struct audmgr *am)
{
int rc;
if (am->state != STATE_CLOSED)
return 0;
am->ept = msm_rpc_connect(AUDMGR_PROG,
AUDMGR_VERS,
MSM_RPC_UNINTERRUPTIBLE);
init_waitqueue_head(&am->wait);
if (IS_ERR(am->ept)) {
rc = PTR_ERR(am->ept);
am->ept = NULL;
pr_err("audmgr: failed to connect to audmgr svc\n");
return rc;
}
am->task = kthread_run(audmgr_rpc_thread, am, "audmgr_rpc");
if (IS_ERR(am->task)) {
rc = PTR_ERR(am->task);
am->task = NULL;
msm_rpc_close(am->ept);
am->ept = NULL;
return rc;
}
am->state = STATE_DISABLED;
return 0;
}
EXPORT_SYMBOL(audmgr_open);
int audmgr_close(struct audmgr *am)
{
return -EBUSY;
}
EXPORT_SYMBOL(audmgr_close);
int audmgr_enable(struct audmgr *am, struct audmgr_config *cfg)
{
struct audmgr_enable_msg msg;
int rc;
if (am->state == STATE_ENABLED)
return 0;
if (am->state == STATE_DISABLING)
pr_err("audmgr: state is DISABLING in enable?\n");
am->state = STATE_ENABLING;
msg.args.set_to_one = cpu_to_be32(1);
msg.args.tx_sample_rate = cpu_to_be32(cfg->tx_rate);
msg.args.rx_sample_rate = cpu_to_be32(cfg->rx_rate);
msg.args.def_method = cpu_to_be32(cfg->def_method);
msg.args.codec_type = cpu_to_be32(cfg->codec);
msg.args.snd_method = cpu_to_be32(cfg->snd_method);
msg.args.cb_func = cpu_to_be32(0x11111111);
msg.args.client_data = cpu_to_be32(0x11223344);
msm_rpc_setup_req(&msg.hdr, AUDMGR_PROG, msm_rpc_get_vers(am->ept),
AUDMGR_ENABLE_CLIENT);
rc = msm_rpc_write(am->ept, &msg, sizeof(msg));
if (rc < 0)
return rc;
rc = wait_event_timeout(am->wait, am->state != STATE_ENABLING, 15 * HZ);
if (rc == 0) {
pr_err("audmgr_enable: ARM9 did not reply to RPC am->state = %d\n", am->state);
BUG();
}
if (am->state == STATE_ENABLED)
return 0;
pr_err("audmgr: unexpected state %d while enabling?!\n", am->state);
return -ENODEV;
}
EXPORT_SYMBOL(audmgr_enable);
int audmgr_disable(struct audmgr *am)
{
struct audmgr_disable_msg msg;
int rc;
if (am->state == STATE_DISABLED)
return 0;
msm_rpc_setup_req(&msg.hdr, AUDMGR_PROG, msm_rpc_get_vers(am->ept),
AUDMGR_DISABLE_CLIENT);
msg.handle = cpu_to_be32(am->handle);
am->state = STATE_DISABLING;
rc = msm_rpc_write(am->ept, &msg, sizeof(msg));
if (rc < 0)
return rc;
rc = wait_event_timeout(am->wait, am->state != STATE_DISABLING, 15 * HZ);
if (rc == 0) {
pr_err("audmgr_disable: ARM9 did not reply to RPC am->state = %d\n", am->state);
BUG();
}
if (am->state == STATE_DISABLED)
return 0;
pr_err("audmgr: unexpected state %d while disabling?!\n", am->state);
return -ENODEV;
}
EXPORT_SYMBOL(audmgr_disable);
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