linux-kernel - Re: [PATCH] Input: synaptics-rmi4 - use %ph to form F34 configuration ID

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Date:   Tue, 30 May 2017 09:59:13 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-input@...r.kernel.org, Nick Dyer <nick@...anahar.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: synaptics-rmi4 - use %ph to form F34
 configuration ID

On Tue, May 30, 2017 at 10:23:58AM +0200, Benjamin Tissoires wrote:
> On May 29 2017 or thereabouts, Dmitry Torokhov wrote:
> > Instead of printing bytes one by one, let's use %phN to print the buffer in
> > one go.
> > 
> > Also use hweight8 to count number of partitions instead of inspecting it
> > bit by bit.
> > 
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > ---
> 
> Looks good to me:
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

Hm, I just realized taht we'd go from upper to lowercase hex digits. I
think it should be OK, but I'd like to hear interested parties (Nick).

Or we'd need to introduce %pH I guess.

> 
> Cheers,
> Benjamin
> 
> >  drivers/input/rmi4/rmi_f34v7.c | 22 ++++++++--------------
> >  1 file changed, 8 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/input/rmi4/rmi_f34v7.c b/drivers/input/rmi4/rmi_f34v7.c
> > index ae2db1c3aebf..3991d2943660 100644
> > --- a/drivers/input/rmi4/rmi_f34v7.c
> > +++ b/drivers/input/rmi4/rmi_f34v7.c
> > @@ -9,13 +9,14 @@
> >   * the Free Software Foundation.
> >   */
> >  
> > +#include <linux/bitops.h>
> >  #include <linux/kernel.h>
> >  #include <linux/rmi.h>
> >  #include <linux/firmware.h>
> > -#include <asm/unaligned.h>
> >  #include <linux/delay.h>
> >  #include <linux/slab.h>
> >  #include <linux/jiffies.h>
> > +#include <asm/unaligned.h>
> >  
> >  #include "rmi_driver.h"
> >  #include "rmi_f34.h"
> > @@ -464,7 +465,7 @@ static int rmi_f34v7_read_queries_bl_version(struct f34_data *f34)
> >  static int rmi_f34v7_read_queries(struct f34_data *f34)
> >  {
> >  	int ret;
> > -	int i, j;
> > +	int i;
> >  	u8 base;
> >  	int offset;
> >  	u8 *ptable;
> > @@ -519,9 +520,6 @@ static int rmi_f34v7_read_queries(struct f34_data *f34)
> >  
> >  	if (query_0 & HAS_CONFIG_ID) {
> >  		u8 f34_ctrl[CONFIG_ID_SIZE];
> > -		int i = 0;
> > -		u8 *p = f34->configuration_id;
> > -		*p = '\0';
> >  
> >  		ret = rmi_read_block(f34->fn->rmi_dev,
> >  				f34->fn->fd.control_base_addr,
> > @@ -531,13 +529,11 @@ static int rmi_f34v7_read_queries(struct f34_data *f34)
> >  			return ret;
> >  
> >  		/* Eat leading zeros */
> > -		while (i < sizeof(f34_ctrl) && !f34_ctrl[i])
> > -			i++;
> > +		for (i = 0; i < sizeof(f34_ctrl) - 1 && !f34_ctrl[i]; i++)
> > +			/* Empty */;
> >  
> > -		for (; i < sizeof(f34_ctrl); i++)
> > -			p += snprintf(p, f34->configuration_id
> > -				      + sizeof(f34->configuration_id) - p,
> > -				      "%02X", f34_ctrl[i]);
> > +		snprintf(f34->configuration_id, sizeof(f34->configuration_id),
> > +			 "%*phN", (int)sizeof(f34_ctrl) - i, f34_ctrl + i);
> >  
> >  		rmi_dbg(RMI_DEBUG_FN, &f34->fn->dev, "Configuration ID: %s\n",
> >  			f34->configuration_id);
> > @@ -545,9 +541,7 @@ static int rmi_f34v7_read_queries(struct f34_data *f34)
> >  
> >  	f34->v7.partitions = 0;
> >  	for (i = 0; i < sizeof(query_1_7.partition_support); i++)
> > -		for (j = 0; j < 8; j++)
> > -			if (query_1_7.partition_support[i] & (1 << j))
> > -				f34->v7.partitions++;
> > +		f34->v7.partitions += hweight8(query_1_7.partition_support[i]);
> >  
> >  	rmi_dbg(RMI_DEBUG_FN, &f34->fn->dev, "%s: Supported partitions: %*ph\n",
> >  		__func__, sizeof(query_1_7.partition_support),
> > -- 
> > 2.13.0.219.gdb65acc882-goog
> > 
> > 
> > -- 
> > Dmitry

-- 
Dmitry