Re: [PATCH 3/4] ath9k: add debugfs files for reading/writing registers

[Benoit Papillault <benoit.papillault@xxxxxxx>]

Le 11/05/2010 17:23, Felix Fietkau a écrit :
> Signed-off-by: Felix Fietkau<nbd@xxxxxxxxxxx>

This patch has been around in my tree for quite a long time and it's 
really helpful to play with registers.

Acked-by: Benoit Papillault <benoit.papillault@xxxxxxx>

> ---
>   drivers/net/wireless/ath/ath9k/debug.c |   89 ++++++++++++++++++++++++++++++++
>   drivers/net/wireless/ath/ath9k/debug.h |    1 +
>   2 files changed, 90 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
> index 8d7c046..29898f8 100644
> --- a/drivers/net/wireless/ath/ath9k/debug.c
> +++ b/drivers/net/wireless/ath/ath9k/debug.c
> @@ -795,6 +795,86 @@ static const struct file_operations fops_recv = {
>   	.owner = THIS_MODULE
>   };
>
> +static ssize_t read_file_regidx(struct file *file, char __user *user_buf,
> +                                size_t count, loff_t *ppos)
> +{
> +	struct ath_softc *sc = file->private_data;
> +	char buf[32];
> +	unsigned int len;
> +
> +	len = snprintf(buf, sizeof(buf), "0x%08x\n", sc->debug.regidx);
> +	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
> +}
> +
> +static ssize_t write_file_regidx(struct file *file, const char __user *user_buf,
> +			     size_t count, loff_t *ppos)
> +{
> +	struct ath_softc *sc = file->private_data;
> +	unsigned long regidx;
> +	char buf[32];
> +	ssize_t len;
> +
> +	len = min(count, sizeof(buf) - 1);
> +	if (copy_from_user(buf, user_buf, len))
> +		return -EINVAL;
> +
> +	buf[len] = '\0';
> +	if (strict_strtoul(buf, 0,&regidx))
> +		return -EINVAL;
> +
> +	sc->debug.regidx = regidx;
> +	return count;
> +}
> +
> +static const struct file_operations fops_regidx = {
> +	.read = read_file_regidx,
> +	.write = write_file_regidx,
> +	.open = ath9k_debugfs_open,
> +	.owner = THIS_MODULE
> +};
> +
> +static ssize_t read_file_regval(struct file *file, char __user *user_buf,
> +			     size_t count, loff_t *ppos)
> +{
> +	struct ath_softc *sc = file->private_data;
> +	struct ath_hw *ah = sc->sc_ah;
> +	char buf[32];
> +	unsigned int len;
> +	u32 regval;
> +
> +	regval = REG_READ_D(ah, sc->debug.regidx);
> +	len = snprintf(buf, sizeof(buf), "0x%08x\n", regval);
> +	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
> +}
> +
> +static ssize_t write_file_regval(struct file *file, const char __user *user_buf,
> +			     size_t count, loff_t *ppos)
> +{
> +	struct ath_softc *sc = file->private_data;
> +	struct ath_hw *ah = sc->sc_ah;
> +	unsigned long regval;
> +	char buf[32];
> +	ssize_t len;
> +
> +	len = min(count, sizeof(buf) - 1);
> +	if (copy_from_user(buf, user_buf, len))
> +		return -EINVAL;
> +
> +	buf[len] = '\0';
> +	if (strict_strtoul(buf, 0,&regval))
> +		return -EINVAL;
> +
> +	REG_WRITE_D(ah, sc->debug.regidx, regval);
> +	return count;
> +}
> +
> +static const struct file_operations fops_regval = {
> +	.read = read_file_regval,
> +	.write = write_file_regval,
> +	.open = ath9k_debugfs_open,
> +	.owner = THIS_MODULE
> +};
> +
>   int ath9k_init_debug(struct ath_hw *ah)
>   {
>   	struct ath_common *common = ath9k_hw_common(ah);
> @@ -846,6 +926,15 @@ int ath9k_init_debug(struct ath_hw *ah)
>   			sc->debug.debugfs_phy, sc,&fops_tx_chainmask))
>   		goto err;
>
> +	if (!debugfs_create_file("regidx", S_IRUSR | S_IWUSR,
> +			sc->debug.debugfs_phy, sc,&fops_regidx))
> +		goto err;
> +
> +	if (!debugfs_create_file("regval", S_IRUSR | S_IWUSR,
> +			sc->debug.debugfs_phy, sc,&fops_regval))
> +		goto err;
> +
> +	sc->debug.regidx = 0;
>   	return 0;
>   err:
>   	ath9k_exit_debug(ah);
> diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
> index 7314360..5147b87 100644
> --- a/drivers/net/wireless/ath/ath9k/debug.h
> +++ b/drivers/net/wireless/ath/ath9k/debug.h
> @@ -153,6 +153,7 @@ struct ath_stats {
>
>   struct ath9k_debug {
>   	struct dentry *debugfs_phy;
> +	u32 regidx;
>   	struct ath_stats stats;
>   };

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