Re: [PATCH v2] w1: introduce an ability to specify microseconds bus scanning intervals

[Evgeniy Polyakov]

Hi

Looks good to me. Greg, please pull it into your tree.

Acked-by: Evgeniy Polyakov <zbr@xxxxxxxxxxx>

23.04.2015, 00:56, "Dmitry Khromov" <dk@xxxxxxxxxxxx>:
> Signed-off-by: Dmitry Khromov <dk@xxxxxxxxxxxx>
> ---
>  drivers/w1/w1.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
> index 181f41c..c9a7ff6 100644
> --- a/drivers/w1/w1.c
> +++ b/drivers/w1/w1.c
> @@ -46,11 +46,15 @@ MODULE_AUTHOR("Evgeniy Polyakov <zbr@xxxxxxxxxxx>");
>  MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
>
>  static int w1_timeout = 10;
> +static int w1_timeout_us = 0;
>  int w1_max_slave_count = 64;
>  int w1_max_slave_ttl = 10;
>
>  module_param_named(timeout, w1_timeout, int, 0);
>  MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches");
> +module_param_named(timeout_us, w1_timeout_us, int, 0);
> +MODULE_PARM_DESC(timeout, "time in microseconds between automatic slave"
> +          " searches");
>  /* A search stops when w1_max_slave_count devices have been found in that
>   * search.  The next search will start over and detect the same set of devices
>   * on a static 1-wire bus.  Memory is not allocated based on this number, just
> @@ -317,6 +321,14 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic
>          return count;
>  }
>
> +static ssize_t w1_master_attribute_show_timeout_us(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + ssize_t count;
> + count = sprintf(buf, "%d\n", w1_timeout_us);
> + return count;
> +}
> +
>  static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
>          struct device_attribute *attr, const char *buf, size_t count)
>  {
> @@ -543,6 +555,7 @@ static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
>  static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP);
>  static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
>  static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
> +static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO);
>  static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
>  static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP);
>  static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP);
> @@ -556,6 +569,7 @@ static struct attribute *w1_master_default_attrs[] = {
>          &w1_master_attribute_max_slave_count.attr,
>          &w1_master_attribute_attempts.attr,
>          &w1_master_attribute_timeout.attr,
> + &w1_master_attribute_timeout_us.attr,
>          &w1_master_attribute_pointer.attr,
>          &w1_master_attribute_search.attr,
>          &w1_master_attribute_pullup.attr,
> @@ -1108,7 +1122,8 @@ int w1_process(void *data)
>          /* As long as w1_timeout is only set by a module parameter the sleep
>           * time can be calculated in jiffies once.
>           */
> - const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
> + const unsigned long jtime =
> +  usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us);
>          /* remainder if it woke up early */
>          unsigned long jremain = 0;
>
> --
> 2.3.5
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