Re: [PATCH] fix nct7802_temp_is_visible

From: Guenter Roeck
Date: Wed Jun 24 2015 - 20:00:22 EST


Hi Constantine,

On 06/24/2015 03:47 PM, Constantine Shulyupin wrote:
From: const <const@xxxxxxxxxxxxx>

Fixed registers are invisible only when registers' mode is 0

Signed-off-by: Constantine Shulyupin <const@xxxxxxxxxxxxx>
---
drivers/hwmon/nct7802.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
index ec56782..65e40c2 100644
--- a/drivers/hwmon/nct7802.c
+++ b/drivers/hwmon/nct7802.c
@@ -541,13 +541,11 @@ static umode_t nct7802_temp_is_visible(struct kobject *kobj,
if (err < 0)
return 0;

- if (index < 9 &&
- (reg & 03) != 0x01 && (reg & 0x03) != 0x02) /* RD1 */
+ if (index < 9 && !(reg & 0x03)) /* RD1 */
return 0;
- if (index >= 9 && index < 18 &&
- (reg & 0x0c) != 0x04 && (reg & 0x0c) != 0x08) /* RD2 */
+ if (index >= 9 && index < 18 && !(reg & 0x0c)) /* RD2 */
return 0;
- if (index >= 18 && index < 27 && (reg & 0x30) != 0x10) /* RD3 */
+ if (index >= 18 && index < 27 && !(reg & 0x30)) /* RD3 */

11b sets a sensor to voltage sense mode, not temperature mode.
This is what the inX attributes are for. We can not just display a
random temperature value if a sensor is configured to measure a voltage.

According to my datasheet, 01b (0x10 shifted) is reserved for RD3.
So there is a bug, but it is

if (index >= 18 && index < 27 && (reg & 0x30) != 0x10) /* RD3 */
which should be
if (index >= 18 && index < 27 && (reg & 0x30) != 0x20) /* RD3 */

Can you send an updated patch ?

Thanks,
Guenter

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