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Date: Tue, 4 Sep 2012 09:20:48 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Christophe Leroy <christophe.leroy@....fr>
Cc: Jean Delvare <khali@...ux-fr.org>, linux-kernel@...r.kernel.org,
lm-sensors@...sensors.org
Subject: Re: [PATCH 2/2] hwmon/lm70: Adds support for LM71 and LM74
On Tue, Sep 04, 2012 at 10:41:34AM +0200, Christophe Leroy wrote:
> Adding support for LM74 and LM71 chips
>
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>
Hi Christophe,
couple of comments below.
> diff -u linux-3.5-vanilla/drivers/hwmon/Kconfig linux-3.5/drivers/hwmon/Kconfig
> --- linux-3.5-vanilla/drivers/hwmon/Kconfig 2012-07-21 22:58:29.000000000 +0200
> +++ linux-3.5/drivers/hwmon/Kconfig 2012-08-25 00:44:05.000000000 +0200
> @@ -530,12 +530,12 @@
> will be called lm63.
>
> config SENSORS_LM70
> - tristate "National Semiconductor LM70 / Texas Instruments TMP121"
> + tristate "National Semiconductor LM70 and compatibles"
> depends on SPI_MASTER
> help
> If you say yes here you get support for the National Semiconductor
> - LM70 and Texas Instruments TMP121/TMP123 digital temperature
> - sensor chips.
> + LM70, LM71, LM74 and Texas Instruments TMP121/TMP123 digital tempera-
> + ture sensor chips.
>
> This driver can also be built as a module. If so, the module
> will be called lm70.
> diff -u linux-3.5-vanilla/drivers/hwmon/lm70.c linux-3.5/drivers/hwmon/lm70.c
> --- linux-3.5-vanilla/drivers/hwmon/lm70.c 2012-07-21 22:58:29.000000000 +0200
> +++ linux-3.5/drivers/hwmon/lm70.c 2012-08-25 00:49:46.000000000 +0200
> @@ -43,6 +43,8 @@
>
> #define LM70_CHIP_LM70 0 /* original NS LM70 */
> #define LM70_CHIP_TMP121 1 /* TI TMP121/TMP123 */
> +#define LM70_CHIP_LM71 2 /* NS LM71 */
> +#define LM70_CHIP_LM74 3 /* NS LM71 */
>
NS LM71 -> NS LM74
> struct lm70 {
> struct device *hwmon_dev;
> @@ -88,9 +90,13 @@
> * Celsius.
> * So it's equivalent to multiplying by 0.25 * 1000 = 250.
> *
> - * TMP121/TMP123:
> + * LM74 and TMP121/TMP123:
> * 13 bits of 2's complement data, discard LSB 3 bits,
> * resolution 0.0625 degrees celsius.
> + *
> + * LM71:
> + * 14 bits of 2's complement data, discard LSB 2 bits,
> + * resolution 0.0312 degrees celsius.
> */
> switch (p_lm70->chip) {
> case LM70_CHIP_LM70:
> @@ -98,8 +104,13 @@
> break;
>
> case LM70_CHIP_TMP121:
> + case LM70_CHIP_LM74:
> val = ((int)raw / 8) * 625 / 10;
> break;
> +
> + case LM70_CHIP_LM71:
> + val = ((int)raw / 4) * 3125 / 100;
> + break;
> }
>
> status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */
> @@ -123,6 +134,12 @@
> case LM70_CHIP_TMP121:
> ret = sprintf(buf, "tmp121\n");
> break;
> + case LM71_CHIP_LM71:
> + ret = sprintf(buf, "lm71\n");
> + break;
> + case LM74_CHIP_LM74:
> + ret = sprintf(buf, "lm74\n");
> + break;
Please make sure to at least compile your code ... the above doesn't compile.
> default:
> ret = -EINVAL;
> }
> @@ -139,7 +156,7 @@
> struct lm70 *p_lm70;
> int status;
>
> - /* signaling is SPI_MODE_0 for both LM70 and TMP121 */
> + /* signaling is SPI_MODE_0 */
> if (spi->mode & (SPI_CPOL | SPI_CPHA))
> return -EINVAL;
>
> @@ -198,6 +215,8 @@
> static const struct spi_device_id lm70_ids[] = {
> { "lm70", LM70_CHIP_LM70 },
> { "tmp121", LM70_CHIP_TMP121 },
> + { "lm71", LM70_CHIP_LM71 },
> + { "lm74", LM70_CHIP_LM74 },
Please align LM70_xxx to the first two lines.
> { },
> };
> MODULE_DEVICE_TABLE(spi, lm70_ids);
> @@ -215,5 +234,5 @@
> module_spi_driver(lm70_driver);
>
> MODULE_AUTHOR("Kaiwan N Billimoria");
> -MODULE_DESCRIPTION("NS LM70 / TI TMP121/TMP123 Linux driver");
> +MODULE_DESCRIPTION("NS LM70 and compatibles Linux driver");
> MODULE_LICENSE("GPL");
> diff -u linux-3.5-vanilla/Documentation/hwmon/lm70 linux-3.5/Documentation/hwmon/lm70
> --- linux-3.5-vanilla/Documentation/hwmon/lm70 2012-07-21 22:58:29.000000000 +0200
> +++ linux-3.5/Documentation/hwmon/lm70 2012-08-25 00:37:15.000000000 +0200
> @@ -6,6 +6,10 @@
> Datasheet: http://www.national.com/pf/LM/LM70.html
> * Texas Instruments TMP121/TMP123
> Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html
> + * National Semiconductor LM71
> + Datasheet: http://www.ti.com/product/LM71
> + * National Semiconductor LM74
> + Datasheet: http://www.ti.com/product/LM74
>
> Author:
> Kaiwan N Billimoria <kaiwan@...ignergraphix.com>
> @@ -31,9 +35,12 @@
> with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
> and its associated documentation.
>
> -The TMP121/TMP123 are very similar; main difference is 13-bit temperature
> +The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit temperature
Please move the last word to the next line to keep the line length at 80 columns.
Thanks,
Guenter
> data (0.0625 degrees celsius resolution).
>
> +The LM71 is also very similar; main difference is 14-bit temperature
> +data (0.03125 degrees celsius resolution).
> +
> Thanks to
> ---------
> Jean Delvare <khali@...ux-fr.org> for mentoring the hwmon-side driver
>
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