Date:	Wed, 18 Jun 2014 12:37:13 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	hs@...x.de
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

On 06/18/2014 11:46 AM, Heiko Schocher wrote:
> 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 ...
>
I thought your are using the devicetree source to load the driver. In 
that case it need not to be platform driver.
we can use "of_device_id struct" which matches the bindings in your 
trivial-devices.txt

Thanks
Varka Bhadram
> 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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