linux-kernel - Re: [RFC,PATCH v2] hwmon: ADC124S501 generic driver

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Date:	Wed, 30 Jul 2008 03:27:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Marc Pignat <marc.pignat@...s.ch>
Cc:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	David Brownell <david-b@...bell.net>,
	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	Tobias Himmer <tobias@...mer-online.de>,
	"Hans J. Koch" <hjk@...utronix.de>
Subject: Re: [RFC,PATCH v2] hwmon: ADC124S501 generic driver

On Wed, 30 Jul 2008 12:16:00 +0200 Marc Pignat <marc.pignat@...s.ch> wrote:

> SPI driver for analog to digital converters national semiconductor ADC081S101,
> ADC124S501, ...
> 
> Code for 8 channels by : Tobias Himmer <tobias@...mer-online.de>
> 
> Signed-off-by: Marc Pignat <marc.pignat@...s.ch>
> ---
> 
> Hi all!
> 
> patch against 2.6.27-rc1, tested on a custom arm board and only compile-tested
> on x86.
> 
> This driver add support for National Semiconductor ADC<bb><c>S<sss> chip family,
> where:
>  * bb  is the resolution in number of bits (8, 10, 12)
>  * c   is the number of channels (1, 2, 4, 8)
>  * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500
>    kSPS and 101 for 1 MSPS)
> 
> Changes from v1:
>  * error recovery fixed
>  * support for 8 channels, thanks to Tobias
>  * better CodingStyle
> 
> Thanks for your comments and testing ;)
> 

I think you forgot this bit:

diff -puN drivers/hwmon/adcxx.c~hwmon-adc124s501-generic-driver-cleanup drivers/hwmon/adcxx.c
--- a/drivers/hwmon/adcxx.c~hwmon-adc124s501-generic-driver-cleanup
+++ a/drivers/hwmon/adcxx.c
@@ -61,7 +61,6 @@ static ssize_t adcxx_read(struct device 
 	struct spi_device *spi = to_spi_device(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct adcxx *adc = dev_get_drvdata(&spi->dev);
-
 	u8 tx_buf[2] = { attr->index << 3 }; /* other bits are don't care */
 	u8 rx_buf[2];
 	int status;
@@ -100,7 +99,6 @@ static ssize_t adcxx_show_max(struct dev
 {
 	struct spi_device *spi = to_spi_device(dev);
 	struct adcxx *adc = dev_get_drvdata(&spi->dev);
-
 	u32 reference;
 
 	if (mutex_lock_interruptible(&adc->lock))
@@ -118,7 +116,6 @@ static ssize_t adcxx_set_max(struct devi
 {
 	struct spi_device *spi = to_spi_device(dev);
 	struct adcxx *adc = dev_get_drvdata(&spi->dev);
-
 	unsigned long value;
 
 	if (strict_strtoul(buf, 10, &value))
_

OK?

> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 00ff533..9c4a579 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -390,6 +390,22 @@ config SENSORS_LM70
>  	  This driver can also be built as a module.  If so, the module
>  	  will be called lm70.
>  
> +config SENSORS_ADCXX
> +	tristate "National Semiconductor ADCxxxSxxx"
> +	depends on SPI_MASTER && EXPERIMENTAL
> +	help
> +	  If you say yes here you get support for the National Semiconductor
> +	  ADC<bb><c>S<sss> chip family, where
> +	  * bb  is the resolution in number of bits (8, 10, 12)
> +	  * c   is the number of channels (1, 2, 4)
> +	  * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500
> +	    kSPS and 101 for 1 MSPS)
> +
> +	  Examples : ADC081S101, ADC124S501, ...
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called adcxx.

hm, I wonder if it really needs to be EXPERIMENTAL.

> +static struct spi_driver adcxx1s_driver = {
> +	.driver = {
> +		.name	= "adcxx1s",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe	= adcxx1s_probe,
> +	.remove	= __devexit_p(adcxx_remove),
> +};
> +
> +static struct spi_driver adcxx2s_driver = {
> +	.driver = {
> +		.name	= "adcxx2s",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe	= adcxx2s_probe,
> +	.remove	= __devexit_p(adcxx_remove),
> +};
> +
> +static struct spi_driver adcxx4s_driver = {
> +	.driver = {
> +		.name	= "adcxx4s",
> +		.owner	= THIS_MODULE,
> +	},
> +	.probe	= adcxx4s_probe,
> +	.remove	= __devexit_p(adcxx_remove),
> +};

Is suspend/resume support needed on this device?

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