linux-kernel - [PATCH 27/66] hwmon: (max1111) use permission-specific DEVICE

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Date:   Thu, 22 Dec 2016 13:04:56 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Jean Delvare <jdelvare@...e.com>
Cc:     kernel-janitors@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 27/66] hwmon: (max1111) use permission-specific DEVICE_ATTR variants

Use DEVICE_ATTR_RO etc. for read only attributes etc.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The semantic patch for the RO case, in the case where the show function
already has the expected name, is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@ro@
declarer name DEVICE_ATTR;
identifier x,x_show;
@@

DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);

@script:ocaml@
x << ro.x;
x_show << ro.x_show;
@@

if not (x^"_show" = x_show) then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RO;
identifier ro.x,ro.x_show;
@@

- DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);
+ DEVICE_ATTR_RO(x);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/hwmon/max1111.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/max1111.c b/drivers/hwmon/max1111.c
index 303d0c9..8ddd4d6 100644
--- a/drivers/hwmon/max1111.c
+++ b/drivers/hwmon/max1111.c
@@ -98,7 +98,7 @@ int max1111_read_channel(int channel)
  * likely to be used by hwmon applications to distinguish between
  * different devices, explicitly add a name attribute here.
  */
-static ssize_t show_name(struct device *dev,
+static ssize_t name_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);
@@ -125,7 +125,7 @@ static ssize_t show_adc(struct device *dev,
 #define MAX1111_ADC_ATTR(_id)		\
 	SENSOR_DEVICE_ATTR(in##_id##_input, S_IRUGO, show_adc, NULL, _id)
 
-static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+static DEVICE_ATTR_RO(name);
 static MAX1111_ADC_ATTR(0);
 static MAX1111_ADC_ATTR(1);
 static MAX1111_ADC_ATTR(2);