diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/usb/pulse8-cec/pulse8-cec.c | 80 |
1 files changed, 61 insertions, 19 deletions
diff --git a/drivers/media/usb/pulse8-cec/pulse8-cec.c b/drivers/media/usb/pulse8-cec/pulse8-cec.c index 34dbc567dbe0..961b34dfaf6d 100644 --- a/drivers/media/usb/pulse8-cec/pulse8-cec.c +++ b/drivers/media/usb/pulse8-cec/pulse8-cec.c @@ -164,6 +164,8 @@ static const char *pulse8_msgname(u8 cmd) #define PING_PERIOD (15 * HZ) +#define NUM_MSGS 8 + struct pulse8 { struct device *dev; struct serio *serio; @@ -173,8 +175,12 @@ struct pulse8 { struct delayed_work ping_eeprom_work; struct work_struct irq_work; - u8 irq_work_result; - struct cec_msg rx_msg; + struct cec_msg rx_msg[NUM_MSGS]; + unsigned int rx_msg_cur_idx, rx_msg_num; + /* protect rx_msg_cur_idx and rx_msg_num */ + spinlock_t msg_lock; + u8 new_rx_msg[CEC_MAX_MSG_SIZE]; + u8 new_rx_msg_len; struct work_struct tx_work; u32 tx_done_status; @@ -321,15 +327,22 @@ static void pulse8_irq_work_handler(struct work_struct *work) { struct pulse8 *pulse8 = container_of(work, struct pulse8, irq_work); - u8 result = pulse8->irq_work_result; + unsigned long flags; u32 status; - pulse8->irq_work_result = 0; - switch (result & 0x3f) { - case MSGCODE_FRAME_DATA: - cec_received_msg(pulse8->adap, &pulse8->rx_msg); - break; + spin_lock_irqsave(&pulse8->msg_lock, flags); + while (pulse8->rx_msg_num) { + spin_unlock_irqrestore(&pulse8->msg_lock, flags); + cec_received_msg(pulse8->adap, + &pulse8->rx_msg[pulse8->rx_msg_cur_idx]); + spin_lock_irqsave(&pulse8->msg_lock, flags); + if (pulse8->rx_msg_num) + pulse8->rx_msg_num--; + pulse8->rx_msg_cur_idx = + (pulse8->rx_msg_cur_idx + 1) % NUM_MSGS; } + spin_unlock_irqrestore(&pulse8->msg_lock, flags); + mutex_lock(&pulse8->lock); status = pulse8->tx_done_status; pulse8->tx_done_status = 0; @@ -342,6 +355,8 @@ static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct pulse8 *pulse8 = serio_get_drvdata(serio); + unsigned long irq_flags; + unsigned int idx; if (!pulse8->started && data != MSGSTART) return IRQ_HANDLED; @@ -353,7 +368,6 @@ static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data, data += MSGOFFSET; pulse8->escape = false; } else if (data == MSGEND) { - struct cec_msg *msg = &pulse8->rx_msg; u8 msgcode = pulse8->buf[0]; if (debug > 1) @@ -362,19 +376,43 @@ static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data, pulse8->idx, pulse8->buf); switch (msgcode & 0x3f) { case MSGCODE_FRAME_START: - msg->len = 1; - msg->msg[0] = pulse8->buf[1]; - break; + /* + * Test if we are receiving a new msg when a previous + * message is still pending. + */ + if (!(msgcode & MSGCODE_FRAME_EOM)) { + pulse8->new_rx_msg_len = 1; + pulse8->new_rx_msg[0] = pulse8->buf[1]; + break; + } + /* fall through */ case MSGCODE_FRAME_DATA: - if (msg->len == CEC_MAX_MSG_SIZE) + if (pulse8->new_rx_msg_len < CEC_MAX_MSG_SIZE) + pulse8->new_rx_msg[pulse8->new_rx_msg_len++] = + pulse8->buf[1]; + if (!(msgcode & MSGCODE_FRAME_EOM)) break; - msg->msg[msg->len++] = pulse8->buf[1]; - if (msgcode & MSGCODE_FRAME_EOM) { - WARN_ON(pulse8->irq_work_result); - pulse8->irq_work_result = msgcode; - schedule_work(&pulse8->irq_work); + + spin_lock_irqsave(&pulse8->msg_lock, irq_flags); + idx = (pulse8->rx_msg_cur_idx + pulse8->rx_msg_num) % + NUM_MSGS; + if (pulse8->rx_msg_num == NUM_MSGS) { + dev_warn(pulse8->dev, + "message queue is full, dropping %*ph\n", + pulse8->new_rx_msg_len, + pulse8->new_rx_msg); + spin_unlock_irqrestore(&pulse8->msg_lock, + irq_flags); + pulse8->new_rx_msg_len = 0; break; } + pulse8->rx_msg_num++; + memcpy(pulse8->rx_msg[idx].msg, pulse8->new_rx_msg, + pulse8->new_rx_msg_len); + pulse8->rx_msg[idx].len = pulse8->new_rx_msg_len; + spin_unlock_irqrestore(&pulse8->msg_lock, irq_flags); + schedule_work(&pulse8->irq_work); + pulse8->new_rx_msg_len = 0; break; case MSGCODE_TRANSMIT_SUCCEEDED: WARN_ON(pulse8->tx_done_status); @@ -403,6 +441,7 @@ static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data, case MSGCODE_LOW_ERROR: case MSGCODE_RECEIVE_FAILED: case MSGCODE_TIMEOUT_ERROR: + pulse8->new_rx_msg_len = 0; break; case MSGCODE_COMMAND_ACCEPTED: case MSGCODE_COMMAND_REJECTED: @@ -443,8 +482,10 @@ static int pulse8_cec_adap_enable(struct cec_adapter *adap, bool enable) cmd[1] = enable; err = pulse8_send_and_wait(pulse8, cmd, 2, MSGCODE_COMMAND_ACCEPTED, 1); - if (!enable) + if (!enable) { + pulse8->rx_msg_num = 0; pulse8->tx_done_status = 0; + } mutex_unlock(&pulse8->lock); return enable ? err : 0; } @@ -790,6 +831,7 @@ static int pulse8_connect(struct serio *serio, struct serio_driver *drv) INIT_WORK(&pulse8->irq_work, pulse8_irq_work_handler); INIT_WORK(&pulse8->tx_work, pulse8_tx_work_handler); mutex_init(&pulse8->lock); + spin_lock_init(&pulse8->msg_lock); pulse8->config_pending = false; err = serio_open(serio, drv); |