Date:	Wed, 18 Jun 2014 08:16:50 +0200
From:	Heiko Schocher <hs@...x.de>
To:	Varka Bhadram <varkabhadram@...il.com>
CC:	lm-sensors@...sensors.org, Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v5] hwmon: Driver for TI TMP103 temperature sensor

Hello Varka,

Am 18.06.2014 07:46, schrieb Varka Bhadram:
> Hi,
>
> On 06/18/2014 11:07 AM, Heiko Schocher wrote:
>> Driver for the TI TMP103.
>>
>> The TI TMP103 is similar to the TMP102. It differs from the TMP102
>> by having only 8 bit registers.
>>
>> Signed-off-by: Heiko Schocher <hs@...x.de>
>>
>> ---
>>
>> Cc: Jean Delvare <khali@...ux-fr.org>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>> Cc: linux-kernel@...r.kernel.org
>> Cc: devicetree@...r.kernel.org
>> Cc: linux-doc@...r.kernel.org
>> Cc: Mark Rutland <mark.rutland@....com>
>>
>> - change for v2:
>> - add comments from GuenterRoeck:
>> - remove Cc from commit subject
>> - add devicetree maintainer
>> - move Documentation to Documentation/hwmon/tmp103
>> - remove devicetree bindings from Documentation
>> - add compatible string to
>> "Documentation/devicetree/bindings/i2c/trivial-devices.txt"
>> - remove CamelCase
>> - fix Codingstyle issues
>> - use ATTRIBUTE_GROUPS and devm_hwmon_device_register_with_groups()
>> - remove unsused define TMP103_CONFIG_RD_ONLY
>> - restore config register when exit()
>> - use regmap
>> - changes for v3:
>> again a lot of fantastic tips how to use regmap efficiently
>> from Guenter Roeck:
>> - get rid of "struct tmp103"
>> - get rid of "static const u8 tmp103_reg[]"
>> - get rid of mutex lock
>> - drop config_orig entirely
>> - use regmap_update_bits()
>> - changes for v4:
>> - add comment from Guenter Roeck:
>> define TMP103_CONFIG_MASK and TMP103_CONF_SD_MASK
>> separately to ensure you catch all the to-be-cleared bits.
>> - changes for v5:
>> add comment from Guenter Roeck:
>> - use "#define TMP103_CONF_SD TMP103_CONF_M1"
>> add comment from Mark Rutland:
>> - use full string for DT compatible string matching, instead of
>> DRIVER_NAME. Get rid complete of DRIVER_NAME define.
>>
>> .../devicetree/bindings/i2c/trivial-devices.txt | 1 +
>> Documentation/hwmon/tmp103 | 28 +++
>> drivers/hwmon/Kconfig | 10 +
>> drivers/hwmon/Makefile | 1 +
>> drivers/hwmon/tmp103.c | 205 +++++++++++++++++++++
>> 5 files changed, 245 insertions(+)
>> create mode 100644 Documentation/hwmon/tmp103
>> create mode 100644 drivers/hwmon/tmp103.c
>>
>> diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>> index bef86e5..fc944e0 100644
>> --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>> +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>> @@ -83,5 +83,6 @@ stm,m41t80 M41T80 - SERIAL ACCESS RTC WITH ALARMS
>> taos,tsl2550 Ambient Light Sensor with SMBUS/Two Wire Serial Interface
>> ti,tsc2003 I2C Touch-Screen Controller
>> ti,tmp102 Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface
>> +ti,tmp103 Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface
>> ti,tmp275 Digital Temperature Sensor
>> winbond,wpct301 i2c trusted platform module (TPM)
>> diff --git a/Documentation/hwmon/tmp103 b/Documentation/hwmon/tmp103
>> new file mode 100644
>> index 0000000..ec00a15
>> --- /dev/null
>> +++ b/Documentation/hwmon/tmp103
>> @@ -0,0 +1,28 @@
>> +Kernel driver tmp103
>> +====================
>> +
>> +Supported chips:
>> + * Texas Instruments TMP103
>> + Prefix: 'tmp103'
>> + Addresses scanned: none
>> + Product info and datasheet: http://www.ti.com/product/tmp103
>> +
>> +Author:
>> + Heiko Schocher <hs@...x.de>
>> +
>> +Description
>> +-----------
>> +
>> +The TMP103 is a digital output temperature sensor in a four-ball
>> +wafer chip-scale package (WCSP). The TMP103 is capable of reading
>> +temperatures to a resolution of 1°C. The TMP103 is specified for
>> +operation over a temperature range of –40°C to +125°C.
>> +
>> +Resolution: 8 Bits
>> +Accuracy: ±1°C Typ (–10°C to +100°C)
>> +
>> +The driver provides the common sysfs-interface for temperatures (see
>> +Documentation/hwmon/sysfs-interface under Temperatures).
>> +
>> +Please refer how to instantiate this driver:
>> +Documentation/i2c/instantiating-devices
>> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
>> index 08531a1..c882d4b 100644
>> --- a/drivers/hwmon/Kconfig
>> +++ b/drivers/hwmon/Kconfig
>> @@ -1391,6 +1391,16 @@ config SENSORS_TMP102
>> This driver can also be built as a module. If so, the module
>> will be called tmp102.
>> +config SENSORS_TMP103
>> + tristate "Texas Instruments TMP103"
>> + depends on I2C
>> + help
>> + If you say yes here you get support for Texas Instruments TMP103
>> + sensor chips.
>> +
>> + This driver can also be built as a module. If so, the module
>> + will be called tmp103.
>> +
>> config SENSORS_TMP401
>> tristate "Texas Instruments TMP401 and compatibles"
>> depends on I2C
>> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
>> index 3dc0f02..cc0df1ef 100644
>> --- a/drivers/hwmon/Makefile
>> +++ b/drivers/hwmon/Makefile
>> @@ -135,6 +135,7 @@ obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
>> obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
>> obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
>> obj-$(CONFIG_SENSORS_TMP102) += tmp102.o
>> +obj-$(CONFIG_SENSORS_TMP103) += tmp103.o
>> obj-$(CONFIG_SENSORS_TMP401) += tmp401.o
>> obj-$(CONFIG_SENSORS_TMP421) += tmp421.o
>> obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
>> diff --git a/drivers/hwmon/tmp103.c b/drivers/hwmon/tmp103.c
>> new file mode 100644
>> index 0000000..e69dbca
>> --- /dev/null
>> +++ b/drivers/hwmon/tmp103.c
>> @@ -0,0 +1,205 @@
>> +/*
>> + * Texas Instruments TMP103 SMBus temperature sensor driver
>> + * Copyright (C) 2014 Heiko Schocher <hs@...x.de>
>> + *
>> + * Based on:
>> + * Texas Instruments TMP102 SMBus temperature sensor driver
>> + *
>> + * Copyright (C) 2010 Steven King <sfking@...dc.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.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/init.h>
>> +#include <linux/slab.h>
>> +#include <linux/i2c.h>
>> +#include <linux/hwmon.h>
>> +#include <linux/hwmon-sysfs.h>
>> +#include <linux/err.h>
>> +#include <linux/mutex.h>
>> +#include <linux/device.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/regmap.h>
>> +
>> +#define TMP103_TEMP_REG 0x00
>> +#define TMP103_CONF_REG 0x01
>> +#define TMP103_TLOW_REG 0x02
>> +#define TMP103_THIGH_REG 0x03
>> +
>> +#define TMP103_CONF_M0 0x01
>> +#define TMP103_CONF_M1 0x02
>> +#define TMP103_CONF_LC 0x04
>> +#define TMP103_CONF_FL 0x08
>> +#define TMP103_CONF_FH 0x10
>> +#define TMP103_CONF_CR0 0x20
>> +#define TMP103_CONF_CR1 0x40
>> +#define TMP103_CONF_ID 0x80
>> +#define TMP103_CONF_SD (TMP103_CONF_M1)
>> +#define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1)
>> +
>> +#define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1)
>> +#define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \
>> + TMP103_CONF_M0 | TMP103_CONF_M1)
>> +
>> +static inline int tmp103_reg_to_mc(s8 val)
>> +{
>> + return val * 1000;
>> +}
>> +
>> +static inline u8 tmp103_mc_to_reg(int val)
>> +{
>> + return DIV_ROUND_CLOSEST(val, 1000);
>> +}
>> +
>> +static ssize_t tmp103_show_temp(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
>> + struct regmap *regmap = dev_get_drvdata(dev);
>> + unsigned int regval;
>> + int ret;
>> +
>> + ret = regmap_read(regmap, sda->index, &regval);
>> + if (ret < 0)
>> + return ret;
>> +
>> + return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval));
>> +}
>> +
>> +static ssize_t tmp103_set_temp(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
>> + struct regmap *regmap = dev_get_drvdata(dev);
>> + long val;
>> + int ret;
>> +
>> + if (kstrtol(buf, 10, &val) < 0)
>> + return -EINVAL;
>> +
>> + val = clamp_val(val, -55000, 127000);
>> + ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val));
>> + return ret ? ret : count;
>> +}
>> +
>> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL ,
>> + TMP103_TEMP_REG);
>> +
>> +static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp,
>> + tmp103_set_temp, TMP103_TLOW_REG);
>> +
>> +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp,
>> + tmp103_set_temp, TMP103_THIGH_REG);
>> +
>> +static struct attribute *tmp103_attrs[] = {
>> + &sensor_dev_attr_temp1_input.dev_attr.attr,
>> + &sensor_dev_attr_temp1_min.dev_attr.attr,
>> + &sensor_dev_attr_temp1_max.dev_attr.attr,
>> + NULL
>> +};
>> +ATTRIBUTE_GROUPS(tmp103);
>> +
>> +static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg)
>> +{
>> + return reg == TMP103_TEMP_REG;
>> +}
>> +
>> +static struct regmap_config tmp103_regmap_config = {
>> + .reg_bits = 8,
>> + .val_bits = 8,
>> + .max_register = TMP103_THIGH_REG,
>> + .volatile_reg = tmp103_regmap_is_volatile,
>> +};
>> +
>> +static int tmp103_probe(struct i2c_client *client,
>> + const struct i2c_device_id *id)
>> +{
>> + struct device *dev = &client->dev;
>> + struct device *hwmon_dev;
>> + struct regmap *regmap;
>> + int ret;
>> +
>> + if (!i2c_check_functionality(client->adapter,
>> + I2C_FUNC_SMBUS_BYTE_DATA)) {
>> + dev_err(&client->dev,
>> + "adapter doesn't support SMBus byte transactions\n");
>> + return -ENODEV;
>> + }
>> +
>> + regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config);
>> + if (IS_ERR(regmap)) {
>> + dev_err(dev, "failed to allocate register map\n");
>> + return PTR_ERR(regmap);
>> + }
>> +
>> + ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK,
>> + TMP103_CONFIG);
>> + if (ret < 0) {
>> + dev_err(&client->dev, "error writing config register\n");
>> + return ret;
>> + }
>> +
>> + hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
>> + regmap, tmp103_groups);
>> + return PTR_ERR_OR_ZERO(hwmon_dev);
>> +}
>> +
>> +#ifdef CONFIG_PM
>> +static int tmp103_suspend(struct device *dev)
>> +{
>> + struct regmap *regmap = dev_get_drvdata(dev);
>> +
>> + return regmap_update_bits(regmap, TMP103_CONF_REG,
>> + TMP103_CONF_SD_MASK, 0);
>> +}
>> +
>> +static int tmp103_resume(struct device *dev)
>> +{
>> + struct regmap *regmap = dev_get_drvdata(dev);
>> +
>> + return regmap_update_bits(regmap, TMP103_CONF_REG,
>> + TMP103_CONF_SD_MASK, TMP103_CONF_SD);
>> +}
>> +
>> +static const struct dev_pm_ops tmp103_dev_pm_ops = {
>> + .suspend = tmp103_suspend,
>> + .resume = tmp103_resume,
>> +};
>> +
>> +#define TMP103_DEV_PM_OPS (&tmp103_dev_pm_ops)
>> +#else
>> +#define TMP103_DEV_PM_OPS NULL
>> +#endif /* CONFIG_PM */
>> +
>> +static const struct i2c_device_id tmp103_id[] = {
>> + { "tmp103", 0 },
>> + { }
>> +};
>
> In the bindings you are giving the compatible property as : ti,tmp103, but here only tmp103.
>
> Instead of using the i2c_device_id struct , use of_device_id struct for giving the
> compatible property value.
> compatble = "<manufacturer>,<model>"

There are a lot of drivers in drivers/hwmon which use "i2c_device_id struct",
and for them only "model" is necessary ...

As this is not a platform driver, I do not know, if "of_device_id struct"
is possible to use. For that, it must be converted to a platform
device driver ...

bye,
Heiko
>
>> +MODULE_DEVICE_TABLE(i2c, tmp103_id);
>> ++static struct i2c_driver tmp103_driver = {
>> + .driver = {
>> + .name = "tmp103",
>> + .pm = TMP103_DEV_PM_OPS,
>> + },
>> + .probe = tmp103_probe,
>> + .id_table = tmp103_id,
>> +};
>> +
>> +module_i2c_driver(tmp103_driver);
>> +
>> +MODULE_AUTHOR("Heiko Schocher <hs@...x.de>");
>> +MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver");
>> +MODULE_LICENSE("GPL");
>
>
>

-- 
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HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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