![Iago Abal](/assets/img/avatar_default.png)
Release &hi->lock before calling `cs_hsi_control_read_error' to avoid deadlock. The bug was found using EBA (https://github.com/models-team/eba), which reported the following: Double lock first at drivers/hsi/clients/cmt_speech.c:443 second at drivers/hsi/clients/cmt_speech.c:447 In cs_hsi_read_on_control_complete defined at drivers/hsi/clients/cmt_speech.c:438: (!) drivers/hsi/clients/cmt_speech.c:443: spin_lock(& hi->lock); (?) drivers/hsi/clients/cmt_speech.c:445: msg->status == 4 -> true (!) drivers/hsi/clients/cmt_speech.c:447: cs_hsi_control_read_error(hi, msg); (!) drivers/hsi/clients/cmt_speech.c:407: __cs_hsi_error_pre(hi, msg, "control read", & hi->control_state); (!) drivers/hsi/clients/cmt_speech.c:382: spin_lock(& hi->lock); Signed-off-by: Iago Abal <mail@iagoabal.eu> Signed-off-by: Sebastian Reichel <sre@kernel.org>
1463 lines
34 KiB
C
1463 lines
34 KiB
C
/*
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* cmt_speech.c - HSI CMT speech driver
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*
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* Copyright (C) 2008,2009,2010 Nokia Corporation. All rights reserved.
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*
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* Contact: Kai Vehmanen <kai.vehmanen@nokia.com>
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* Original author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/ioctl.h>
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#include <linux/uaccess.h>
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#include <linux/pm_qos.h>
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#include <linux/hsi/hsi.h>
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#include <linux/hsi/ssi_protocol.h>
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#include <linux/hsi/cs-protocol.h>
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#define CS_MMAP_SIZE PAGE_SIZE
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struct char_queue {
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struct list_head list;
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u32 msg;
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};
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struct cs_char {
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unsigned int opened;
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struct hsi_client *cl;
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struct cs_hsi_iface *hi;
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struct list_head chardev_queue;
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struct list_head dataind_queue;
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int dataind_pending;
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/* mmap things */
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unsigned long mmap_base;
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unsigned long mmap_size;
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spinlock_t lock;
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struct fasync_struct *async_queue;
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wait_queue_head_t wait;
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/* hsi channel ids */
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int channel_id_cmd;
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int channel_id_data;
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};
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#define SSI_CHANNEL_STATE_READING 1
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#define SSI_CHANNEL_STATE_WRITING (1 << 1)
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#define SSI_CHANNEL_STATE_POLL (1 << 2)
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#define SSI_CHANNEL_STATE_ERROR (1 << 3)
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#define TARGET_MASK 0xf000000
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#define TARGET_REMOTE (1 << CS_DOMAIN_SHIFT)
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#define TARGET_LOCAL 0
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/* Number of pre-allocated commands buffers */
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#define CS_MAX_CMDS 4
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/*
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* During data transfers, transactions must be handled
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* within 20ms (fixed value in cmtspeech HSI protocol)
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*/
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#define CS_QOS_LATENCY_FOR_DATA_USEC 20000
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/* Timeout to wait for pending HSI transfers to complete */
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#define CS_HSI_TRANSFER_TIMEOUT_MS 500
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#define RX_PTR_BOUNDARY_SHIFT 8
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#define RX_PTR_MAX_SHIFT (RX_PTR_BOUNDARY_SHIFT + \
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CS_MAX_BUFFERS_SHIFT)
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struct cs_hsi_iface {
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struct hsi_client *cl;
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struct hsi_client *master;
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unsigned int iface_state;
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unsigned int wakeline_state;
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unsigned int control_state;
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unsigned int data_state;
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/* state exposed to application */
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struct cs_mmap_config_block *mmap_cfg;
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unsigned long mmap_base;
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unsigned long mmap_size;
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unsigned int rx_slot;
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unsigned int tx_slot;
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/* note: for security reasons, we do not trust the contents of
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* mmap_cfg, but instead duplicate the variables here */
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unsigned int buf_size;
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unsigned int rx_bufs;
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unsigned int tx_bufs;
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unsigned int rx_ptr_boundary;
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unsigned int rx_offsets[CS_MAX_BUFFERS];
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unsigned int tx_offsets[CS_MAX_BUFFERS];
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/* size of aligned memory blocks */
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unsigned int slot_size;
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unsigned int flags;
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struct list_head cmdqueue;
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struct hsi_msg *data_rx_msg;
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struct hsi_msg *data_tx_msg;
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wait_queue_head_t datawait;
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struct pm_qos_request pm_qos_req;
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spinlock_t lock;
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};
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static struct cs_char cs_char_data;
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static void cs_hsi_read_on_control(struct cs_hsi_iface *hi);
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static void cs_hsi_read_on_data(struct cs_hsi_iface *hi);
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static inline void rx_ptr_shift_too_big(void)
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{
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BUILD_BUG_ON((1LLU << RX_PTR_MAX_SHIFT) > UINT_MAX);
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}
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static void cs_notify(u32 message, struct list_head *head)
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{
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struct char_queue *entry;
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spin_lock(&cs_char_data.lock);
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if (!cs_char_data.opened) {
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spin_unlock(&cs_char_data.lock);
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goto out;
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}
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
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if (!entry) {
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dev_err(&cs_char_data.cl->device,
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"Can't allocate new entry for the queue.\n");
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spin_unlock(&cs_char_data.lock);
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goto out;
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}
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entry->msg = message;
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list_add_tail(&entry->list, head);
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spin_unlock(&cs_char_data.lock);
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wake_up_interruptible(&cs_char_data.wait);
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kill_fasync(&cs_char_data.async_queue, SIGIO, POLL_IN);
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out:
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return;
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}
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static u32 cs_pop_entry(struct list_head *head)
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{
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struct char_queue *entry;
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u32 data;
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entry = list_entry(head->next, struct char_queue, list);
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data = entry->msg;
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list_del(&entry->list);
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kfree(entry);
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return data;
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}
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static void cs_notify_control(u32 message)
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{
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cs_notify(message, &cs_char_data.chardev_queue);
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}
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static void cs_notify_data(u32 message, int maxlength)
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{
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cs_notify(message, &cs_char_data.dataind_queue);
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spin_lock(&cs_char_data.lock);
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cs_char_data.dataind_pending++;
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while (cs_char_data.dataind_pending > maxlength &&
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!list_empty(&cs_char_data.dataind_queue)) {
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dev_dbg(&cs_char_data.cl->device, "data notification "
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"queue overrun (%u entries)\n", cs_char_data.dataind_pending);
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cs_pop_entry(&cs_char_data.dataind_queue);
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cs_char_data.dataind_pending--;
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}
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spin_unlock(&cs_char_data.lock);
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}
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static inline void cs_set_cmd(struct hsi_msg *msg, u32 cmd)
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{
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u32 *data = sg_virt(msg->sgt.sgl);
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*data = cmd;
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}
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static inline u32 cs_get_cmd(struct hsi_msg *msg)
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{
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u32 *data = sg_virt(msg->sgt.sgl);
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return *data;
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}
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static void cs_release_cmd(struct hsi_msg *msg)
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{
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struct cs_hsi_iface *hi = msg->context;
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list_add_tail(&msg->link, &hi->cmdqueue);
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}
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static void cs_cmd_destructor(struct hsi_msg *msg)
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{
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struct cs_hsi_iface *hi = msg->context;
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spin_lock(&hi->lock);
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dev_dbg(&cs_char_data.cl->device, "control cmd destructor\n");
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if (hi->iface_state != CS_STATE_CLOSED)
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dev_err(&hi->cl->device, "Cmd flushed while driver active\n");
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if (msg->ttype == HSI_MSG_READ)
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hi->control_state &=
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~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
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else if (msg->ttype == HSI_MSG_WRITE &&
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hi->control_state & SSI_CHANNEL_STATE_WRITING)
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hi->control_state &= ~SSI_CHANNEL_STATE_WRITING;
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cs_release_cmd(msg);
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spin_unlock(&hi->lock);
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}
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static struct hsi_msg *cs_claim_cmd(struct cs_hsi_iface* ssi)
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{
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struct hsi_msg *msg;
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BUG_ON(list_empty(&ssi->cmdqueue));
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msg = list_first_entry(&ssi->cmdqueue, struct hsi_msg, link);
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list_del(&msg->link);
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msg->destructor = cs_cmd_destructor;
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return msg;
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}
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static void cs_free_cmds(struct cs_hsi_iface *ssi)
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{
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struct hsi_msg *msg, *tmp;
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list_for_each_entry_safe(msg, tmp, &ssi->cmdqueue, link) {
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list_del(&msg->link);
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msg->destructor = NULL;
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kfree(sg_virt(msg->sgt.sgl));
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hsi_free_msg(msg);
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}
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}
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static int cs_alloc_cmds(struct cs_hsi_iface *hi)
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{
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struct hsi_msg *msg;
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u32 *buf;
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unsigned int i;
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INIT_LIST_HEAD(&hi->cmdqueue);
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for (i = 0; i < CS_MAX_CMDS; i++) {
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msg = hsi_alloc_msg(1, GFP_KERNEL);
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if (!msg)
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goto out;
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buf = kmalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf) {
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hsi_free_msg(msg);
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goto out;
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}
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sg_init_one(msg->sgt.sgl, buf, sizeof(*buf));
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msg->channel = cs_char_data.channel_id_cmd;
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msg->context = hi;
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list_add_tail(&msg->link, &hi->cmdqueue);
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}
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return 0;
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out:
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cs_free_cmds(hi);
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return -ENOMEM;
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}
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static void cs_hsi_data_destructor(struct hsi_msg *msg)
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{
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struct cs_hsi_iface *hi = msg->context;
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const char *dir = (msg->ttype == HSI_MSG_READ) ? "TX" : "RX";
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dev_dbg(&cs_char_data.cl->device, "Freeing data %s message\n", dir);
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spin_lock(&hi->lock);
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if (hi->iface_state != CS_STATE_CLOSED)
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dev_err(&cs_char_data.cl->device,
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"Data %s flush while device active\n", dir);
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if (msg->ttype == HSI_MSG_READ)
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hi->data_state &=
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~(SSI_CHANNEL_STATE_POLL | SSI_CHANNEL_STATE_READING);
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else
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hi->data_state &= ~SSI_CHANNEL_STATE_WRITING;
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msg->status = HSI_STATUS_COMPLETED;
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if (unlikely(waitqueue_active(&hi->datawait)))
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wake_up_interruptible(&hi->datawait);
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spin_unlock(&hi->lock);
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}
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static int cs_hsi_alloc_data(struct cs_hsi_iface *hi)
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{
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struct hsi_msg *txmsg, *rxmsg;
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int res = 0;
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rxmsg = hsi_alloc_msg(1, GFP_KERNEL);
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if (!rxmsg) {
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res = -ENOMEM;
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goto out1;
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}
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rxmsg->channel = cs_char_data.channel_id_data;
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rxmsg->destructor = cs_hsi_data_destructor;
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rxmsg->context = hi;
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txmsg = hsi_alloc_msg(1, GFP_KERNEL);
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if (!txmsg) {
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res = -ENOMEM;
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goto out2;
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}
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txmsg->channel = cs_char_data.channel_id_data;
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txmsg->destructor = cs_hsi_data_destructor;
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txmsg->context = hi;
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hi->data_rx_msg = rxmsg;
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hi->data_tx_msg = txmsg;
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return 0;
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out2:
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hsi_free_msg(rxmsg);
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out1:
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return res;
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}
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static void cs_hsi_free_data_msg(struct hsi_msg *msg)
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{
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WARN_ON(msg->status != HSI_STATUS_COMPLETED &&
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msg->status != HSI_STATUS_ERROR);
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hsi_free_msg(msg);
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}
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static void cs_hsi_free_data(struct cs_hsi_iface *hi)
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{
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cs_hsi_free_data_msg(hi->data_rx_msg);
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cs_hsi_free_data_msg(hi->data_tx_msg);
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}
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static inline void __cs_hsi_error_pre(struct cs_hsi_iface *hi,
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struct hsi_msg *msg, const char *info,
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unsigned int *state)
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{
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spin_lock(&hi->lock);
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dev_err(&hi->cl->device, "HSI %s error, msg %d, state %u\n",
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info, msg->status, *state);
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}
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static inline void __cs_hsi_error_post(struct cs_hsi_iface *hi)
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{
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spin_unlock(&hi->lock);
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}
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static inline void __cs_hsi_error_read_bits(unsigned int *state)
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{
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*state |= SSI_CHANNEL_STATE_ERROR;
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*state &= ~(SSI_CHANNEL_STATE_READING | SSI_CHANNEL_STATE_POLL);
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}
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static inline void __cs_hsi_error_write_bits(unsigned int *state)
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{
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*state |= SSI_CHANNEL_STATE_ERROR;
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*state &= ~SSI_CHANNEL_STATE_WRITING;
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}
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static void cs_hsi_control_read_error(struct cs_hsi_iface *hi,
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struct hsi_msg *msg)
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{
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__cs_hsi_error_pre(hi, msg, "control read", &hi->control_state);
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cs_release_cmd(msg);
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__cs_hsi_error_read_bits(&hi->control_state);
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__cs_hsi_error_post(hi);
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}
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static void cs_hsi_control_write_error(struct cs_hsi_iface *hi,
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struct hsi_msg *msg)
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{
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__cs_hsi_error_pre(hi, msg, "control write", &hi->control_state);
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cs_release_cmd(msg);
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__cs_hsi_error_write_bits(&hi->control_state);
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__cs_hsi_error_post(hi);
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}
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|
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static void cs_hsi_data_read_error(struct cs_hsi_iface *hi, struct hsi_msg *msg)
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{
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__cs_hsi_error_pre(hi, msg, "data read", &hi->data_state);
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__cs_hsi_error_read_bits(&hi->data_state);
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__cs_hsi_error_post(hi);
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}
|
|
|
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static void cs_hsi_data_write_error(struct cs_hsi_iface *hi,
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struct hsi_msg *msg)
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{
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__cs_hsi_error_pre(hi, msg, "data write", &hi->data_state);
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__cs_hsi_error_write_bits(&hi->data_state);
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__cs_hsi_error_post(hi);
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}
|
|
|
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static void cs_hsi_read_on_control_complete(struct hsi_msg *msg)
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{
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u32 cmd = cs_get_cmd(msg);
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struct cs_hsi_iface *hi = msg->context;
|
|
|
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spin_lock(&hi->lock);
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hi->control_state &= ~SSI_CHANNEL_STATE_READING;
|
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if (msg->status == HSI_STATUS_ERROR) {
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dev_err(&hi->cl->device, "Control RX error detected\n");
|
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spin_unlock(&hi->lock);
|
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cs_hsi_control_read_error(hi, msg);
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goto out;
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}
|
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dev_dbg(&hi->cl->device, "Read on control: %08X\n", cmd);
|
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cs_release_cmd(msg);
|
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if (hi->flags & CS_FEAT_TSTAMP_RX_CTRL) {
|
|
struct timespec tspec;
|
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struct cs_timestamp *tstamp =
|
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&hi->mmap_cfg->tstamp_rx_ctrl;
|
|
|
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ktime_get_ts(&tspec);
|
|
|
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tstamp->tv_sec = (__u32) tspec.tv_sec;
|
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tstamp->tv_nsec = (__u32) tspec.tv_nsec;
|
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}
|
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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;
|
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}
|
|
|
|
WARN_ON(!(hi->control_state & SSI_CHANNEL_STATE_READING));
|
|
|
|
dev_dbg(&hi->cl->device, "Peek on control complete, reading\n");
|
|
msg->sgt.nents = 1;
|
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msg->complete = cs_hsi_read_on_control_complete;
|
|
ret = hsi_async_read(hi->cl, msg);
|
|
if (ret)
|
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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, bool 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)) {
|
|
err = PTR_ERR(hsi_if->master);
|
|
dev_err(&cl->device, "Could not get HSI master client\n");
|
|
goto leave4;
|
|
}
|
|
if (!ssip_slave_running(hsi_if->master)) {
|
|
err = -ENODEV;
|
|
dev_err(&cl->device,
|
|
"HSI port not initialized\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 const 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 -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
break;
|
|
}
|
|
|
|
if (state > 1) {
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
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_pages(vma) != 1)
|
|
return -EINVAL;
|
|
|
|
vma->vm_flags |= VM_IO | VM_DONTDUMP | VM_DONTEXPAND;
|
|
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;
|
|
unsigned long p;
|
|
|
|
spin_lock_bh(&cs_char_data.lock);
|
|
if (cs_char_data.opened) {
|
|
ret = -EBUSY;
|
|
spin_unlock_bh(&cs_char_data.lock);
|
|
goto out1;
|
|
}
|
|
cs_char_data.opened = 1;
|
|
cs_char_data.dataind_pending = 0;
|
|
spin_unlock_bh(&cs_char_data.lock);
|
|
|
|
p = get_zeroed_page(GFP_KERNEL);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out2;
|
|
}
|
|
|
|
ret = cs_hsi_start(&cs_char_data.hi, cs_char_data.cl, p, CS_MMAP_SIZE);
|
|
if (ret) {
|
|
dev_err(&cs_char_data.cl->device, "Unable to initialize HSI\n");
|
|
goto out3;
|
|
}
|
|
|
|
/* these are only used in release so lock not needed */
|
|
cs_char_data.mmap_base = p;
|
|
cs_char_data.mmap_size = CS_MMAP_SIZE;
|
|
|
|
file->private_data = &cs_char_data;
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
free_page(p);
|
|
out2:
|
|
spin_lock_bh(&cs_char_data.lock);
|
|
cs_char_data.opened = 0;
|
|
spin_unlock_bh(&cs_char_data.lock);
|
|
out1:
|
|
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 = "cmt_speech",
|
|
.fops = &cs_char_fops
|
|
};
|
|
|
|
static int 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);
|
|
|
|
cs_char_data.channel_id_cmd = hsi_get_channel_id_by_name(cl,
|
|
"speech-control");
|
|
if (cs_char_data.channel_id_cmd < 0) {
|
|
err = cs_char_data.channel_id_cmd;
|
|
dev_err(dev, "Could not get cmd channel (%d)\n", err);
|
|
return err;
|
|
}
|
|
|
|
cs_char_data.channel_id_data = hsi_get_channel_id_by_name(cl,
|
|
"speech-data");
|
|
if (cs_char_data.channel_id_data < 0) {
|
|
err = cs_char_data.channel_id_data;
|
|
dev_err(dev, "Could not get data channel (%d)\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = misc_register(&cs_char_miscdev);
|
|
if (err)
|
|
dev_err(dev, "Failed to register: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int 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 = "cmt-speech",
|
|
.owner = THIS_MODULE,
|
|
.probe = cs_hsi_client_probe,
|
|
.remove = cs_hsi_client_remove,
|
|
},
|
|
};
|
|
|
|
static int __init cs_char_init(void)
|
|
{
|
|
pr_info("CMT speech driver added\n");
|
|
return hsi_register_client_driver(&cs_hsi_driver);
|
|
}
|
|
module_init(cs_char_init);
|
|
|
|
static void __exit cs_char_exit(void)
|
|
{
|
|
hsi_unregister_client_driver(&cs_hsi_driver);
|
|
pr_info("CMT speech driver removed\n");
|
|
}
|
|
module_exit(cs_char_exit);
|
|
|
|
MODULE_ALIAS("hsi:cmt-speech");
|
|
MODULE_AUTHOR("Kai Vehmanen <kai.vehmanen@nokia.com>");
|
|
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
|
|
MODULE_DESCRIPTION("CMT speech driver");
|
|
MODULE_LICENSE("GPL v2");
|