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Message-ID: <20180320160814.GA31015@roeck-us.net>
Date: Tue, 20 Mar 2018 09:08:14 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Andrey Gusakov <andrey.gusakov@...entembedded.com>
Cc: jdelvare@...e.com, lee.jones@...aro.org, cphealy@...il.com,
andrew.smirnov@...il.com, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: MC13783: add uid and die temperature sensor
inputs
On Tue, Mar 20, 2018 at 06:01:27PM +0300, Andrey Gusakov wrote:
> The uid and die temperature can be read out on the ADIN7 using
> input mux. Map uid and die tenperature sensor to channels 16
> and 17.
>
> Signed-off-by: Andrey Gusakov <andrey.gusakov@...entembedded.com>
> ---
> Changes in v2:
> - suport both mc13783 and mc13892
> - uit_input renamed to in16_input
> - style fixes
> ---
> drivers/hwmon/mc13783-adc.c | 57 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/mfd/mc13xxx-core.c | 15 +++++++++++-
> include/linux/mfd/mc13xxx.h | 2 ++
> 3 files changed, 73 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
> index 960a1db..413b83c 100644
> --- a/drivers/hwmon/mc13783-adc.c
> +++ b/drivers/hwmon/mc13783-adc.c
> @@ -63,6 +63,10 @@ static int mc13783_adc_read(struct device *dev,
> if (ret)
> return ret;
>
> + /* ADIN7 subchannels */
> + if (channel >= 16)
> + channel = 7;
> +
> channel &= 0x7;
>
> *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
> @@ -111,6 +115,54 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
> return sprintf(buf, "%u\n", val);
> }
>
> +static ssize_t mc13783_adc_read_uid(struct device *dev,
> + struct device_attribute *devattr, char *buf)
Please watch multi-line alignments.
> +{
> + unsigned int val;
> + struct platform_device *pdev = to_platform_device(dev);
> + kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
> + int ret = mc13783_adc_read(dev, devattr, &val);
> +
> + if (ret)
> + return ret;
> +
> + /* MC13892 have 1/2 divider, input range is [0, 4.800V] */
> + if (driver_data & MC13783_ADC_BPDIV2)
> + val = DIV_ROUND_CLOSEST(val * 4800, 1024);
> + /* MC13783 have 0.9 divider, input range is [0, 2.555V] */
Please move the comments into the if/else block and adjust indentation.
> + else
> + val = DIV_ROUND_CLOSEST(val * 2555, 1024);
> +
> + return sprintf(buf, "%u\n", val);
> +}
> +
> +static ssize_t mc13783_adc_read_temp(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + unsigned int val;
> + struct platform_device *pdev = to_platform_device(dev);
> + kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
> + int ret = mc13783_adc_read(dev, devattr, &val);
> +
> + if (ret)
> + return ret;
> +
> + /* MC13892:
> + * Die Temperature Read Out Code at 25C 680
> + * Temperature change per LSB +0.4244C
> + */
This is not a networking driver. Please use the standard multi-line
comment format. Also, please move the comments into the if/else
block and use { } to improve readability.
> + if (driver_data & MC13783_ADC_BPDIV2)
> + ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
> + /* MC13783:
> + * Die Temperature Read Out Code at 25C 282
> + * Temperature change per LSB -1.14C
> + */
Especially this comment is just confusing due to its alignment.
> + else
> + ret = 346480 - 1140 * val;
> +
> + return sprintf(buf, "%d\n", ret);
> +}
> +
> static DEVICE_ATTR_RO(name);
> static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
> static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
> @@ -124,6 +176,9 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
> static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
> static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
> static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
> +static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, mc13783_adc_read_uid, NULL, 16);
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
> + mc13783_adc_read_temp, NULL, 17);
>
> static struct attribute *mc13783_attr_base[] = {
> &dev_attr_name.attr,
> @@ -131,6 +186,8 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
> &sensor_dev_attr_in5_input.dev_attr.attr,
> &sensor_dev_attr_in6_input.dev_attr.attr,
> &sensor_dev_attr_in7_input.dev_attr.attr,
> + &sensor_dev_attr_in16_input.dev_attr.attr,
> + &sensor_dev_attr_temp1_input.dev_attr.attr,
> NULL
> };
>
> diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
> index d7f54e4..c63e331 100644
> --- a/drivers/mfd/mc13xxx-core.c
> +++ b/drivers/mfd/mc13xxx-core.c
> @@ -279,8 +279,21 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
> adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2;
> adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
>
> - if (channel > 7)
> + /*
> + * Channels mapped through ADIN7:
> + * 7 - General purpose ADIN7
> + * 16 - UID
> + * 17 - Die temperature
> + */
> + if (channel > 7 && channel < 16) {
> adc1 |= MC13XXX_ADC1_ADSEL;
> + } else if (channel == 16) {
> + adc0 |= MC13XXX_ADC0_ADIN7SEL_UID;
> + channel = 7;
> + } else if (channel == 17) {
> + adc0 |= MC13XXX_ADC0_ADIN7SEL_DIE;
> + channel = 7;
> + }
>
> switch (mode) {
> case MC13XXX_ADC_MODE_TS:
> diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
> index 638222e..54a3cd8 100644
> --- a/include/linux/mfd/mc13xxx.h
> +++ b/include/linux/mfd/mc13xxx.h
> @@ -243,6 +243,8 @@ struct mc13xxx_platform_data {
> #define MC13XXX_ADC0_LICELLCON (1 << 0)
> #define MC13XXX_ADC0_CHRGICON (1 << 1)
> #define MC13XXX_ADC0_BATICON (1 << 2)
> +#define MC13XXX_ADC0_ADIN7SEL_DIE (1 << 4)
> +#define MC13XXX_ADC0_ADIN7SEL_UID (2 << 4)
> #define MC13XXX_ADC0_ADREFEN (1 << 10)
> #define MC13XXX_ADC0_TSMOD0 (1 << 12)
> #define MC13XXX_ADC0_TSMOD1 (1 << 13)
> --
> 1.9.1
>
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