Re: [PATCH] ALSA: dice: use structure to represent register parameters instead of array with basic type element

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On Thu, 10 Mar 2016 13:44:28 +0100,
Takashi Sakamoto wrote:
> 
> In dice interface, two blocks of register are accessible via IEEE 1394
> asynchronous transaction to represent the number of supported isochronous
> streams and the number of quadlets for stream information.
> 
> Current ALSA dice driver uses array with 'unsigned int' element for
> temporary cache of these information. But using structure is preferable
> for begin easily comprehensible.
> 
> This commit applies a local structure for this aim.
> 
> Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>

Applied, thanks.


Takashi

> ---
>  sound/firewire/dice/dice-stream.c | 110 +++++++++++++++++++-------------------
>  1 file changed, 54 insertions(+), 56 deletions(-)
> 
> diff --git a/sound/firewire/dice/dice-stream.c b/sound/firewire/dice/dice-stream.c
> index 2077f18..845d5e5 100644
> --- a/sound/firewire/dice/dice-stream.c
> +++ b/sound/firewire/dice/dice-stream.c
> @@ -12,6 +12,11 @@
>  #define	CALLBACK_TIMEOUT	200
>  #define NOTIFICATION_TIMEOUT_MS	(2 * MSEC_PER_SEC)
>  
> +struct reg_params {
> +	unsigned int count;
> +	unsigned int size;
> +};
> +
>  const unsigned int snd_dice_rates[SND_DICE_RATES_COUNT] = {
>  	/* mode 0 */
>  	[0] =  32000,
> @@ -65,7 +70,9 @@ static int ensure_phase_lock(struct snd_dice *dice)
>  	return 0;
>  }
>  
> -static int get_register_params(struct snd_dice *dice, unsigned int params[4])
> +static int get_register_params(struct snd_dice *dice,
> +			       struct reg_params *tx_params,
> +			       struct reg_params *rx_params)
>  {
>  	__be32 reg[2];
>  	int err;
> @@ -73,14 +80,16 @@ static int get_register_params(struct snd_dice *dice, unsigned int params[4])
>  	err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg, sizeof(reg));
>  	if (err < 0)
>  		return err;
> -	params[0] = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
> -	params[1] = be32_to_cpu(reg[1]) * 4;
> +	tx_params->count =
> +			min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
> +	tx_params->size = be32_to_cpu(reg[1]) * 4;
>  
>  	err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg, sizeof(reg));
>  	if (err < 0)
>  		return err;
> -	params[2] = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
> -	params[3] = be32_to_cpu(reg[1]) * 4;
> +	rx_params->count =
> +			min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
> +	rx_params->size = be32_to_cpu(reg[1]) * 4;
>  
>  	return 0;
>  }
> @@ -105,21 +114,21 @@ static void release_resources(struct snd_dice *dice)
>  }
>  
>  static void stop_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
> -			 unsigned int count, unsigned int size)
> +			 struct reg_params *params)
>  {
>  	__be32 reg;
>  	unsigned int i;
>  
> -	for (i = 0; i < count; i++) {
> +	for (i = 0; i < params->count; i++) {
>  		reg = cpu_to_be32((u32)-1);
>  		if (dir == AMDTP_IN_STREAM) {
>  			snd_dice_transaction_write_tx(dice,
> -						size * i + TX_ISOCHRONOUS,
> -						&reg, sizeof(reg));
> +					params->size * i + TX_ISOCHRONOUS,
> +					&reg, sizeof(reg));
>  		} else {
>  			snd_dice_transaction_write_rx(dice,
> -						size * i + RX_ISOCHRONOUS,
> -						&reg, sizeof(reg));
> +					params->size * i + RX_ISOCHRONOUS,
> +					&reg, sizeof(reg));
>  		}
>  	}
>  }
> @@ -180,8 +189,7 @@ static int keep_resources(struct snd_dice *dice,
>  }
>  
>  static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
> -			 unsigned int rate, unsigned int count,
> -			 unsigned int size)
> +			 unsigned int rate, struct reg_params *params)
>  {
>  	__be32 reg[2];
>  	unsigned int i, pcm_chs, midi_ports;
> @@ -197,15 +205,15 @@ static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
>  		resources = dice->rx_resources;
>  	}
>  
> -	for (i = 0; i < count; i++) {
> +	for (i = 0; i < params->count; i++) {
>  		if (dir == AMDTP_IN_STREAM) {
>  			err = snd_dice_transaction_read_tx(dice,
> -						size * i + TX_NUMBER_AUDIO,
> -						reg, sizeof(reg));
> +					params->size * i + TX_NUMBER_AUDIO,
> +					reg, sizeof(reg));
>  		} else {
>  			err = snd_dice_transaction_read_rx(dice,
> -						size * i + RX_NUMBER_AUDIO,
> -						reg, sizeof(reg));
> +					params->size * i + RX_NUMBER_AUDIO,
> +					reg, sizeof(reg));
>  		}
>  		if (err < 0)
>  			return err;
> @@ -219,12 +227,12 @@ static int start_streams(struct snd_dice *dice, enum amdtp_stream_direction dir,
>  		reg[0] = cpu_to_be32(resources[i].channel);
>  		if (dir == AMDTP_IN_STREAM) {
>  			err = snd_dice_transaction_write_tx(dice,
> -						size * i + TX_ISOCHRONOUS,
> -						reg, sizeof(reg[0]));
> +					params->size * i + TX_ISOCHRONOUS,
> +					reg, sizeof(reg[0]));
>  		} else {
>  			err = snd_dice_transaction_write_rx(dice,
> -						size * i + RX_ISOCHRONOUS,
> -						reg, sizeof(reg[0]));
> +					params->size * i + RX_ISOCHRONOUS,
> +					reg, sizeof(reg[0]));
>  		}
>  		if (err < 0)
>  			return err;
> @@ -247,14 +255,14 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  {
>  	unsigned int curr_rate;
>  	unsigned int i;
> -	unsigned int reg_params[4];
> +	struct reg_params tx_params, rx_params;
>  	bool need_to_start;
>  	int err;
>  
>  	if (dice->substreams_counter == 0)
>  		return -EIO;
>  
> -	err = get_register_params(dice, reg_params);
> +	err = get_register_params(dice, &tx_params, &rx_params);
>  	if (err < 0)
>  		return err;
>  
> @@ -271,12 +279,12 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  
>  	/* Judge to need to restart streams. */
>  	for (i = 0; i < MAX_STREAMS; i++) {
> -		if (i < reg_params[0]) {
> +		if (i < tx_params.count) {
>  			if (amdtp_streaming_error(&dice->tx_stream[i]) ||
>  			    !amdtp_stream_running(&dice->tx_stream[i]))
>  				break;
>  		}
> -		if (i < reg_params[2]) {
> +		if (i < rx_params.count) {
>  			if (amdtp_streaming_error(&dice->rx_stream[i]) ||
>  			    !amdtp_stream_running(&dice->rx_stream[i]))
>  				break;
> @@ -287,10 +295,8 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  	if (need_to_start) {
>  		/* Stop transmission. */
>  		snd_dice_transaction_clear_enable(dice);
> -		stop_streams(dice, AMDTP_IN_STREAM, reg_params[0],
> -			     reg_params[1]);
> -		stop_streams(dice, AMDTP_OUT_STREAM, reg_params[2],
> -			     reg_params[3]);
> +		stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
> +		stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
>  		release_resources(dice);
>  
>  		err = ensure_phase_lock(dice);
> @@ -301,12 +307,10 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  		}
>  
>  		/* Start both streams. */
> -		err = start_streams(dice, AMDTP_IN_STREAM, rate, reg_params[0],
> -				    reg_params[1]);
> +		err = start_streams(dice, AMDTP_IN_STREAM, rate, &tx_params);
>  		if (err < 0)
>  			goto error;
> -		err = start_streams(dice, AMDTP_OUT_STREAM, rate, reg_params[2],
> -				    reg_params[3]);
> +		err = start_streams(dice, AMDTP_OUT_STREAM, rate, &rx_params);
>  		if (err < 0)
>  			goto error;
>  
> @@ -318,10 +322,10 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  		}
>  
>  		for (i = 0; i < MAX_STREAMS; i++) {
> -			if ((i < reg_params[0] &&
> +			if ((i < tx_params.count &&
>  			    !amdtp_stream_wait_callback(&dice->tx_stream[i],
>  							CALLBACK_TIMEOUT)) ||
> -			    (i < reg_params[2] &&
> +			    (i < rx_params.count &&
>  			     !amdtp_stream_wait_callback(&dice->rx_stream[i],
>  							 CALLBACK_TIMEOUT))) {
>  				err = -ETIMEDOUT;
> @@ -333,8 +337,8 @@ int snd_dice_stream_start_duplex(struct snd_dice *dice, unsigned int rate)
>  	return err;
>  error:
>  	snd_dice_transaction_clear_enable(dice);
> -	stop_streams(dice, AMDTP_IN_STREAM, reg_params[0], reg_params[1]);
> -	stop_streams(dice, AMDTP_OUT_STREAM, reg_params[2], reg_params[3]);
> +	stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
> +	stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
>  	release_resources(dice);
>  	return err;
>  }
> @@ -346,18 +350,16 @@ error:
>   */
>  void snd_dice_stream_stop_duplex(struct snd_dice *dice)
>  {
> -	unsigned int reg_params[4];
> +	struct reg_params tx_params, rx_params;
>  
>  	if (dice->substreams_counter > 0)
>  		return;
>  
>  	snd_dice_transaction_clear_enable(dice);
>  
> -	if (get_register_params(dice, reg_params) == 0) {
> -		stop_streams(dice, AMDTP_IN_STREAM, reg_params[0],
> -			     reg_params[1]);
> -		stop_streams(dice, AMDTP_OUT_STREAM, reg_params[2],
> -			     reg_params[3]);
> +	if (get_register_params(dice, &tx_params, &rx_params) == 0) {
> +		stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
> +		stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
>  	}
>  
>  	release_resources(dice);
> @@ -444,15 +446,13 @@ end:
>  
>  void snd_dice_stream_destroy_duplex(struct snd_dice *dice)
>  {
> -	unsigned int reg_params[4];
> +	struct reg_params tx_params, rx_params;
>  
>  	snd_dice_transaction_clear_enable(dice);
>  
> -	if (get_register_params(dice, reg_params) == 0) {
> -		stop_streams(dice, AMDTP_IN_STREAM, reg_params[0],
> -			     reg_params[1]);
> -		stop_streams(dice, AMDTP_OUT_STREAM, reg_params[2],
> -			     reg_params[3]);
> +	if (get_register_params(dice, &tx_params, &rx_params) == 0) {
> +		stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
> +		stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
>  	}
>  
>  	release_resources(dice);
> @@ -462,7 +462,7 @@ void snd_dice_stream_destroy_duplex(struct snd_dice *dice)
>  
>  void snd_dice_stream_update_duplex(struct snd_dice *dice)
>  {
> -	unsigned int reg_params[4];
> +	struct reg_params tx_params, rx_params;
>  
>  	/*
>  	 * On a bus reset, the DICE firmware disables streaming and then goes
> @@ -474,11 +474,9 @@ void snd_dice_stream_update_duplex(struct snd_dice *dice)
>  	 */
>  	dice->global_enabled = false;
>  
> -	if (get_register_params(dice, reg_params) == 0) {
> -		stop_streams(dice, AMDTP_IN_STREAM, reg_params[0],
> -			     reg_params[1]);
> -		stop_streams(dice, AMDTP_OUT_STREAM, reg_params[2],
> -			     reg_params[3]);
> +	if (get_register_params(dice, &tx_params, &rx_params) == 0) {
> +		stop_streams(dice, AMDTP_IN_STREAM, &tx_params);
> +		stop_streams(dice, AMDTP_OUT_STREAM, &rx_params);
>  	}
>  }
>  
> -- 
> 2.7.0
> 
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