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Date: Thu, 14 Apr 2011 14:15:58 -0700
From: Guenter Roeck <guenter.roeck@...csson.com>
To: Ashish Jangam <Ashish.Jangam@...tcummins.com>
CC: Randy Dunlap <randy.dunlap@...cle.com>,
Dajun Chen <Dajun.Chen@...semi.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [lm-sensors] [PATCHv1 6/11] HWMON: HWMON module of DA9052 PMIC
driver
On Thu, 2011-04-14 at 08:22 -0400, Ashish Jangam wrote:
> Hi Randy,
>
> HWMON Driver for Dialog Semiconductor DA9052 PMICs.
>
Headline still reads v1.
Downloading the patch itself shows that it is sent in encoded form
(MIME ?). Please have a look at Documentation/SubmittingPatches, #7.
> Changes made since last submission:
> . Changed the return format for charging current, bat temperature
> . and junction temperature
> . Code formatting done
> . Added DA9052 HWMON description file
> . Ported on 2.6.38.2 kernel
>
> Linux Kernel Version: 2.6.38.2
>
> Signed-off-by: D. Chen <dchen@...semi.com>
Since you use your full name elsewhere, you should use it here as well.
Greeting, version, and baseline information should not be part of the
changelog. See Documentation/SubmittingPatches, #15.
> ---
> diff -Naur linux-2.6.38.2/Documentation/hwmon/da9052 wrk_linux-2.6.38.2/Documentation/hwmon/da9052
> --- linux-2.6.38.2/Documentation/hwmon/da9052 1970-01-01 05:00:00.000000000 +0500
> +++ wrk_linux-2.6.38.2/Documentation/hwmon/da9052 2011-04-14 15:27:49.000000000 +0500
> @@ -0,0 +1,60 @@
> +Kernel driver da9052-hwmon
> +==========================
> +
> +Supported chips:
> + * Dialog Semiconductors DA9052 PMICs
> + Prefix: 'da9052'
> + Datasheet:Available on the Internet
> +
Where ?
> +Authors: David Dajun Chen <dchen@...semi.com>
> +
> +Description
> +-----------
> +
> +The DA9052 is a highly integrated PMIC subsystem with supply domain flexibility
> +to support a wide range of application processors, associated peripherals and
> +user interface functions.
> +
> +Combined with a switched-mode DC input/USB compatible charger, full power path
> +management and multiple sleep modes the device offers an energy-optimised
> +solution suitable for portable handheld, wireless and infotainment applications.
> +
> +Interfacing directly to a Li-lon/Polymer battery pack the high efficiency
> +switching charger supports precise current/voltage charging as well as
> +pre charge and USB modes without processor interaction. During charging the die
> +temperature is thermally regulated enabling higher capacity batteries to be
> +rapidly charged at currents up to 1.25A with minimum thermal impact to
> +space-constrained PCB.s.
> +
> +USB suspend mode operation is supported and for robustness the USB power inputs
> +are internally protected against over-voltage conditions.
> +
> +The autonomous power path controller seamlessly detects and manages energy flow
> +between an AC adaptor, USB cable and battery whilst maintaining USB power
> +specification compliance.
> +
> +The internally-generated system power rail supports power scenarios such as
> +instant-on with a full discharged battery. A reverse-protected backup battery
> +charger is also integrated into the power path function.
> +
> +The power efficiency and flexibility of the switching input stage is maintained
> +to the generated supplies. Controlled by a programmable digital power manager
> +the 14 user- programmable switched/linear regulators may be configured
> +for a variety of start up sequences, levels and timings.
> +
Seems to me the above should be in Documentation/mfd, with
Documentation/hwmon/da9052-hwmon concentrating on hwmon specifics (and
possibly referring to Documentation/mfd/da9052).
> +Voltage Monitoring
> +------------------
> +
> +Voltages are sampled by a 10 bit ADC. Voltages in milivolts are 1.465
millivolts
> +times the ADC value.
> +
> +Temperature Monitoring
> +----------------------
> +
> +Temperatures are sampled by a 10 bit ADC. Chip and battery temperatures
> +are available. The chip temperature is calculated as:
> +
> + Degrees celsius = (512.18 - data) / 1.0983
> +
> +while the battery temperature calculation will depend on the NTC
> +thermistor component.
Description of supported sysfs attributes might be helpful.
> diff -Naur linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c wrk_linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c
> --- linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c 1970-01-01 05:00:00.000000000 +0500
> +++ wrk_linux-2.6.38.2/drivers/hwmon/da9052-hwmon.c 2011-04-14 15:36:40.000000000 +0500
> @@ -0,0 +1,328 @@
> +/*
> + * HWMON Driver for Dialog DA9052
> + *
> + * Copyright(c) 2009 Dialog Semiconductor Ltd.
> + *
2009 ?
> + * Author: Dajun Chen <dchen@...semi.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/hwmon.h>
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/da9052/da9052.h>
> +#include <linux/mfd/da9052/reg.h>
> +
> +struct da9052_hwmon {
> + struct da9052 *da9052;
> + struct device *class_device;
> + struct mutex hwmon_lock;
> +};
> +
> +static const char *input_names[] = {
> + [DA9052_ADC_VDDOUT]= "VDDOUT",
There should be a blank before the '='. Tab after '=' is not necessary.
> + [DA9052_ADC_ICH] = "CHARGING CURRENT",
> + [DA9052_ADC_TBAT] = "BATTERY TEMP",
> + [DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
> + [DA9052_ADC_IN4] = "ADC IN4",
> + [DA9052_ADC_IN5] = "ADC IN5",
> + [DA9052_ADC_IN6] = "ADC IN6",
> + [DA9052_ADC_TJUNC]= "BATTERY JUNCTION TEMP",
> + [DA9052_ADC_VBBAT]= "BACK-UP BATTERY VOLTAGE",
> +};
> +
> +static int da9052_enable_vddout_channel(struct da9052 *da9052)
> +{
> + int ret;
> +
> + ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
> + if (ret < 0)
> + return ret;
> +
> + ret |= DA9052_ADCCONT_AUTOVDDEN;
> + return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
> +}
> +
> +static int da9052_disable_vddout_channel(struct da9052 *da9052)
> +{
> + int ret;
> +
> + ret = da9052_reg_read(da9052, DA9052_ADC_CONT_REG);
> + if (ret < 0)
> + return ret;
> +
> + ret |= ~DA9052_ADCCONT_AUTOVDDEN;
I think this should be
ret &= ~DA9052_ADCCONT_AUTOVDDEN;
> + return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
> +
> +}
> +
> +static ssize_t da9052_read_vddout(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret = -EIO;
> +
> + mutex_lock(&hwmon->hwmon_lock);
> +
> + ret = da9052_enable_vddout_channel(hwmon->da9052);
> + if (ret < 0) {
> + mutex_unlock(&hwmon->hwmon_lock);
> + return ret;
> + }
> +
> + ret = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
> + if (ret < 0) {
> + mutex_unlock(&hwmon->hwmon_lock);
> + return ret;
> + }
> +
> + ret = da9052_disable_vddout_channel(hwmon->da9052);
> + if (ret < 0) {
> + mutex_unlock(&hwmon->hwmon_lock);
> + return ret;
> + }
> +
Please refer to Documentation/CodingStyle, Chapter 7: Centralized
exiting of functions.
> + mutex_unlock(&hwmon->hwmon_lock);
> + return sprintf(buf, "%u\n", ret);
> +
> +}
> +
> +static ssize_t da9052_read_ich(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
> + if (ret < 0)
> + return ret;
> +
> + /* Equivalent to 3.9mA/bit in register ICHG_AV */
> + ret = DIV_ROUND_CLOSEST(ret * 39, 10);
> + return sprintf(buf, "%d\n", ret);
> +}
> +
> +static ssize_t da9052_read_tbat(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = da9052_reg_read(hwmon->da9052, DA9052_TBAT_RES_REG);
> + if (ret < 0)
> + return ret;
> +
> + /* Degrees celsius = (512.18-ret) / 1.0983 */
> + ret = 512180 - (ret * 1000);
> + ret = DIV_ROUND_CLOSEST(ret * 10000, 10983);
Result doesn't look like milli-degrees C to me.
> + return sprintf(buf, "%d\n", ret);
> +}
> +
> +static ssize_t da9052_read_vbat(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
> + if (ret < 0)
> + return ret;
> +
> + return sprintf(buf, "%u\n", ret);
> +}
> +
> +static ssize_t da9052_read_misc_channel(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int channel = to_sensor_dev_attr(devattr)->index;
> + int ret;
> +
> + ret = da9052_adc_manual_read(hwmon->da9052, channel);
> + if (ret < 0)
> + return -EIO;
You should return ret here (assuming da9052_adc_manual_read() returns a
valid error code). If it doesn't, it should.
> +
> + return sprintf(buf, "%u\n", ret);
> +}
> +
> +static ssize_t da9052_read_tjunc(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int temp;
> + int ret;
> +
> + ret = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
> + if (ret < 0)
> + return ret;
> +
> + temp = ret;
> +
> + ret = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
> + if (ret < 0)
> + return ret;
> +
> + /* Degrees celsius = 1.708 * (TJUNC_RES– T_OFFSET) – 108.8 */
> + ret = DIV_ROUND_CLOSEST((temp - ret) * 1708, 1000);
> + ret = round_down(ret, 108.8);
A floating point number to round down to ? Really ?
Assuming you return a value in milli-degrees C, this all looks wrong.
> + return sprintf(buf, "%d\n", (char)ret);
> +}
> +
> +static ssize_t da9052_read_vbbat(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
> + if (ret < 0)
> + return ret;
> +
> + return sprintf(buf, "%u\n", ret);
> +
> +}
> +
> +static ssize_t da9052_hwmon_show_name(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + return sprintf(buf, "da9052-hwmon\n");
> +}
> +
> +static ssize_t show_label(struct device *dev,
> + struct device_attribute *devattr, char *buf)
> +{
> + int channel = to_sensor_dev_attr(devattr)->index;
> +
> + return sprintf(buf, "%s\n", input_names[channel]);
> +}
channel variable is really unnecessary here.
return sprintf(buf, "%s\n",\
input_names[to_sensor_dev_attr(devattr)->index]);
should be good enough.
> +
> +#define DA9052_ADC_CHANNELS(id, func_name, name)\
> + static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label,\
> + NULL, name);\
> + static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, func_name,\
> + NULL, name)
> +
> +DA9052_ADC_CHANNELS(0, da9052_read_vddout, DA9052_ADC_VDDOUT);
> +DA9052_ADC_CHANNELS(1, da9052_read_ich, DA9052_ADC_ICH);
> +DA9052_ADC_CHANNELS(2, da9052_read_tbat, DA9052_ADC_TBAT);
> +DA9052_ADC_CHANNELS(3, da9052_read_vbat, DA9052_ADC_VBAT);
> +DA9052_ADC_CHANNELS(4, da9052_read_misc_channel, DA9052_ADC_IN4);
> +DA9052_ADC_CHANNELS(5, da9052_read_misc_channel, DA9052_ADC_IN5);
> +DA9052_ADC_CHANNELS(6, da9052_read_misc_channel, DA9052_ADC_IN6);
> +DA9052_ADC_CHANNELS(8, da9052_read_tjunc, DA9052_ADC_TJUNC);
> +DA9052_ADC_CHANNELS(9, da9052_read_vbbat, DA9052_ADC_VBBAT);
> +
Currents and temperatures are still reported as voltages.
Also, I think you should get rid of the DA9052_ADC_CHANNELS macro.
> +static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
> +
> +static struct attribute *da9052_attr[] = {
> + &dev_attr_name.attr,
> +
> + &sensor_dev_attr_in0_input.dev_attr.attr,
> + &sensor_dev_attr_in0_label.dev_attr.attr,
> + &sensor_dev_attr_in1_input.dev_attr.attr,
> + &sensor_dev_attr_in1_label.dev_attr.attr,
> + &sensor_dev_attr_in2_input.dev_attr.attr,
> + &sensor_dev_attr_in2_label.dev_attr.attr,
> + &sensor_dev_attr_in3_input.dev_attr.attr,
> + &sensor_dev_attr_in3_label.dev_attr.attr,
> + &sensor_dev_attr_in4_input.dev_attr.attr,
> + &sensor_dev_attr_in4_label.dev_attr.attr,
> + &sensor_dev_attr_in5_input.dev_attr.attr,
> + &sensor_dev_attr_in5_label.dev_attr.attr,
> + &sensor_dev_attr_in6_input.dev_attr.attr,
> + &sensor_dev_attr_in6_label.dev_attr.attr,
> + &sensor_dev_attr_in8_input.dev_attr.attr,
> + &sensor_dev_attr_in8_label.dev_attr.attr,
> + &sensor_dev_attr_in9_input.dev_attr.attr,
> + &sensor_dev_attr_in9_label.dev_attr.attr,
> +
> + NULL
> +};
> +
> +static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
> +
> +static int __init da9052_hwmon_probe(struct platform_device *pdev)
> +{
> + struct da9052_hwmon *hwmon;
> + int ret;
> +
> + hwmon = kzalloc(sizeof(struct da9052_hwmon), GFP_KERNEL);
> + if (!hwmon)
> + return -ENOMEM;
> +
> + mutex_init(&hwmon->hwmon_lock);
> + hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
> +
> + hwmon->class_device = hwmon_device_register(&pdev->dev);
> + if (IS_ERR(hwmon->class_device)) {
> + ret = PTR_ERR(hwmon->class_device);
> + goto err_sysfs;
Your goto targets are incorrect. You never need to call
sysfs_remove_group, since it won't be created if there was an error. On
the other side, you never unregister the hwmon device if
sysfs_create_group failed. And I don't think it is necessary to destroy
the mutex.
> + }
> +
> + ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
> + if (ret)
> + goto err_mem;
> +
> + platform_set_drvdata(pdev, hwmon);
> +
Should be done before registering anything, to avoid race conditions.
> + return 0;
> +
> +err_sysfs:
> + sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
> +err_mem:
> + mutex_destroy(&hwmon->hwmon_lock);
> + kfree(hwmon);
> + return ret;
> +}
> +
> +static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
> +{
> + struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
> +
> + mutex_destroy(&hwmon->hwmon_lock);
> + hwmon_device_unregister(hwmon->class_device);
> + sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
> + kfree(hwmon);
> +
> + return 0;
> +}
> +
> +static struct platform_driver da9052_hwmon_driver = {
> + .driver = {
> + .name = "da9052-hwmon",
> + .owner = THIS_MODULE,
> + },
> + .probe = da9052_hwmon_probe,
> + .remove = __devexit_p(da9052_hwmon_remove),
> +
> +};
> +
> +static int __init da9052_hwmon_init(void)
> +{
> +
> + return platform_driver_register(&da9052_hwmon_driver);
> +}
> +module_init(da9052_hwmon_init);
> +
> +static void __exit da9052_hwmon_exit(void)
> +{
> + platform_driver_unregister(&da9052_hwmon_driver);
> +}
> +module_exit(da9052_hwmon_exit);
> +
> +MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
> +MODULE_DESCRIPTION("DA9052 ADC driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:da9052-hwmon");
> diff -Naur linux-2.6.38.2/drivers/hwmon/Kconfig wrk_linux-2.6.38.2/drivers/hwmon/Kconfig
> --- linux-2.6.38.2/drivers/hwmon/Kconfig 2011-03-27 23:37:20.000000000 +0500
> +++ wrk_linux-2.6.38.2/drivers/hwmon/Kconfig 2011-04-14 15:37:09.000000000 +0500
> @@ -294,6 +294,13 @@
> This driver can also be built as a module. If so, the module
> will be called ds1621.
>
> +config SENSORS_DA9052_ADC
> + tristate "Dialog DA9052 HWMON"
> + depends on PMIC_DA9052
> + help
> + Say y here to support the ADC found on
> + Dialog Semiconductor DA9052 PMIC.
> +
... This driver can also be built as module. If built as module, it will
be called da9052-hwmon.
> config SENSORS_I5K_AMB
> tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
> depends on PCI && EXPERIMENTAL
> diff -Naur linux-2.6.38.2/drivers/hwmon/Makefile wrk_linux-2.6.38.2/drivers/hwmon/Makefile
> --- linux-2.6.38.2/drivers/hwmon/Makefile 2011-03-27 23:37:20.000000000 +0500
> +++ wrk_linux-2.6.38.2/drivers/hwmon/Makefile 2011-04-14 15:37:01.000000000 +0500
> @@ -40,6 +40,7 @@
> obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
> obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
> obj-$(CONFIG_SENSORS_PKGTEMP) += pkgtemp.o
> +obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
> obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
> obj-$(CONFIG_SENSORS_DS620) += ds620.o
> obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
>
>
> Regards,
> Ashish J
>
>
> _______________________________________________
> lm-sensors mailing list
> lm-sensors@...sensors.org
> http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
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