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Date: Thu, 8 Jun 2017 14:27:04 +0200
From: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To: "Alex A. Mihaylov" <minimumlaw@...bler.ru>
Cc: Mark Brown <broonie@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Evgeniy Polyakov <zbr@...emap.net>,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/3] w1: MAX1721x Stanalone Fuel Gauge - add 1-Wire slave
drivers
Hi,
On Fri, Jun 02, 2017 at 10:06:28AM +0300, Alex A. Mihaylov wrote:
> Add support for Maxim Semiconductor MAX17211/MAX17215
> Standlone Fuel Gauge chips (1-Wire family 0x26)
I think this is pretty pointless after the w1 subsystem
is available publically [0]. We can just instantiate the w1
device in power-supply and skip registration of another
platform-device.
The registers and helper functions should also be added directly
to the power-supply driver.
[0] https://www.spinics.net/lists/kernel/msg2524566.html
-- Sebastian
> ---
> drivers/w1/slaves/Kconfig | 12 +++++
> drivers/w1/slaves/Makefile | 1 +
> drivers/w1/slaves/w1_max1721x.c | 73 ++++++++++++++++++++++++++++
> drivers/w1/slaves/w1_max1721x.h | 102 ++++++++++++++++++++++++++++++++++++++++
> drivers/w1/w1_family.h | 1 +
> 5 files changed, 189 insertions(+)
> create mode 100644 drivers/w1/slaves/w1_max1721x.c
> create mode 100644 drivers/w1/slaves/w1_max1721x.h
>
> diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
> index 0ef9f2663d..06a63a1021 100644
> --- a/drivers/w1/slaves/Kconfig
> +++ b/drivers/w1/slaves/Kconfig
> @@ -86,6 +86,18 @@ config W1_SLAVE_DS2433_CRC
> Each block has 30 bytes of data and a two byte CRC16.
> Full block writes are only allowed if the CRC is valid.
>
> +config W1_SLAVE_MAX1721X
> + tristate "Maxim MAX17211/MAX17215 battery monitor chip"
> + help
> + If you enable this you will have the MAX17211/MAX17215 battery
> + monitor chip support.
> +
> + The battery monitor chip is used in many batteries/devices
> + as the one who is responsible for charging/discharging/monitoring
> + Li+ batteries.
> +
> + If you are unsure, say N.
> +
> config W1_SLAVE_DS2760
> tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)"
> help
> diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
> index b4a358955e..967329a4b8 100644
> --- a/drivers/w1/slaves/Makefile
> +++ b/drivers/w1/slaves/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_W1_SLAVE_DS2406) += w1_ds2406.o
> obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o
> obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
> obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
> +obj-$(CONFIG_W1_SLAVE_MAX1721X) += w1_max1721x.o
> obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
> obj-$(CONFIG_W1_SLAVE_DS2780) += w1_ds2780.o
> obj-$(CONFIG_W1_SLAVE_DS2781) += w1_ds2781.o
> diff --git a/drivers/w1/slaves/w1_max1721x.c b/drivers/w1/slaves/w1_max1721x.c
> new file mode 100644
> index 0000000000..017ec3e159
> --- /dev/null
> +++ b/drivers/w1/slaves/w1_max1721x.c
> @@ -0,0 +1,73 @@
> +/*
> + * 1-Wire implementation for Maxim Semiconductor
> + * MAX17211/MAX17215 standalone fuel gauge chip
> + *
> + * Copyright (C) 2017 OAO Radioavionica
> + * Author: Alex A. Mihaylov <minimumlaw@...bler.ru>
> + *
> + * Use consistent with the GNU GPL is permitted,
> + * provided that this copyright notice is
> + * preserved in its entirety in all copies and derived works.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/types.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/idr.h>
> +#include <linux/gfp.h>
> +
> +#include "../w1.h"
> +#include "../w1_int.h"
> +#include "../w1_family.h"
> +#include "w1_max1721x.h"
> +
> +static int w1_max17211_add_device(struct w1_slave *sl)
> +{
> + int ret;
> + struct platform_device *pdev;
> +
> + pdev = platform_device_alloc("max1721x-battery", PLATFORM_DEVID_AUTO);
> + if (!pdev)
> + return -ENOMEM;
> + pdev->dev.parent = &sl->dev;
> +
> + ret = platform_device_add(pdev);
> + if (ret)
> + goto pdev_add_failed;
> +
> + dev_set_drvdata(&sl->dev, pdev);
> +
> + return 0;
> +
> +pdev_add_failed:
> + platform_device_put(pdev);
> +
> + return ret;
> +}
> +
> +static void w1_max17211_remove_device(struct w1_slave *sl)
> +{
> + struct platform_device *pdev = dev_get_drvdata(&sl->dev);
> +
> + platform_device_unregister(pdev);
> +}
> +
> +static struct w1_family_ops w1_max17211_fops = {
> + .add_slave = w1_max17211_add_device,
> + .remove_slave = w1_max17211_remove_device,
> +};
> +
> +static struct w1_family w1_max17211_family = {
> + .fid = W1_FAMILY_MAX17211,
> + .fops = &w1_max17211_fops,
> +};
> +module_w1_family(w1_max17211_family);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Alex A. Mihaylov <minimumlaw@...bler.ru>");
> +MODULE_DESCRIPTION("1-wire Driver for MAX17211/MAX17215 battery monitor");
> +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_MAX17211));
> diff --git a/drivers/w1/slaves/w1_max1721x.h b/drivers/w1/slaves/w1_max1721x.h
> new file mode 100644
> index 0000000000..47694d91dc
> --- /dev/null
> +++ b/drivers/w1/slaves/w1_max1721x.h
> @@ -0,0 +1,102 @@
> +/*
> + * 1-Wire implementation for Maxim Semiconductor
> + * MAX7211/MAX17215 stanalone fuel gauge chip
> + *
> + * Copyright (C) 2017 OAO Radioavionica
> + * Author: Alex A. Mihaylov <minimumlaw@...bler.ru>
> + *
> + * Use consistent with the GNU GPL is permitted,
> + * provided that this copyright notice is
> + * preserved in its entirety in all copies and derived works.
> + *
> + */
> +
> +#ifndef __w1_max17211_h__
> +#define __w1_max17211_h__
> +
> +/* Known commands to the MAX1721X chip */
> +#define W1_MAX1721X_READ_DATA 0x69
> +#define W1_MAX1721X_WRITE_DATA 0x6C
> +
> +/* Factory settings (nonvilatile registers) (W1 specific) */
> +
> +#define MAX1721X_REG_NRSENSE 0x1CF /* RSense in 10^-5 Ohm */
> +/* Strings */
> +#define MAX1721X_REG_MFG_STR 0x1CC
> +#define MAX1721X_REG_MFG_NUMB 3
> +#define MAX1721X_REG_DEV_STR 0x1DB
> +#define MAX1721X_REG_DEV_NUMB 5
> +/* HEX Strings */
> +#define MAX1721X_REG_SER_HEX 0x1D8
> +
> +/* MAX1721X/MAX17215 Output Registers for I2C and W1 chips */
> +
> +#define MAX172XX_REG_STATUS 0x000 /* status reg */
> +#define MAX172XX_BAT_PRESENT (1<<4) /* battery connected bit */
> +#define MAX172XX_REG_DEVNAME 0x021 /* chip config */
> +#define MAX172XX_DEV_MASK 0x000F /* chip type mask */
> +#define MAX172X1_DEV 0x0001
> +#define MAX172X5_DEV 0x0005
> +#define MAX172XX_REG_TEMP 0x008 /* Temperature */
> +#define MAX172XX_REG_BATT 0x0DA /* Battery voltage */
> +#define MAX172XX_REG_CURRENT 0x00A /* Actual current */
> +#define MAX172XX_REG_AVGCURRENT 0x00B /* Average current */
> +#define MAX172XX_REG_REPSOC 0x006 /* Percentage of charge */
> +#define MAX172XX_REG_DESIGNCAP 0x018 /* Design capacity */
> +#define MAX172XX_REG_REPCAP 0x005 /* Average capacity */
> +#define MAX172XX_REG_TTE 0x011 /* Time to empty */
> +#define MAX172XX_REG_TTF 0x020 /* Time to full */
> +
> +/* Number of valid register addresses */
> +#define MAX1721X_MAX_REG_NR 0x1EF
> +
> +/* Convert regs value to power_supply units */
> +
> +static inline int max172xx_time_to_ps(unsigned int reg)
> +{
> + return reg * 5625 / 1000; /* in sec. */
> +}
> +
> +static inline int max172xx_percent_to_ps(unsigned int reg)
> +{
> + return reg / 256; /* in percent from 0 to 100 */
> +}
> +
> +static inline int max172xx_voltage_to_ps(unsigned int reg)
> +{
> + return reg * 1250; /* in uV */
> +}
> +
> +static inline int max172xx_capacity_to_ps(unsigned int reg)
> +{
> + return reg * 500; /* in uAh */
> +}
> +
> +/*
> + * Current and temperature is signed values, so unsigned regs
> + * value must be converted to signed type
> + */
> +
> +static inline int max172xx_temperature_to_ps(unsigned int reg)
> +{
> + int val = (int16_t)(reg);
> +
> + return val * 10 / 256; /* in tenths of deg. C */
> +}
> +
> +/*
> + * Calculating current registers resolution:
> + *
> + * RSense stored in 10^-5 Ohm, so mesaurment voltage must be
> + * in 10^-11 Volts for get current in uA.
> + * 16 bit current reg fullscale +/-51.2mV is 102400 uV.
> + * So: 102400 / 65535 * 10^5 = 156252
> + */
> +static inline int max172xx_current_to_voltage(unsigned int reg)
> +{
> + int val = (int16_t)(reg);
> +
> + return val * 156252;
> +}
> +
> +#endif /* !__w1_max17211_h__ */
> diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
> index c4a6b257a3..398adc9973 100644
> --- a/drivers/w1/w1_family.h
> +++ b/drivers/w1/w1_family.h
> @@ -29,6 +29,7 @@
> #define W1_COUNTER_DS2423 0x1D
> #define W1_THERM_DS1822 0x22
> #define W1_EEPROM_DS2433 0x23
> +#define W1_FAMILY_MAX17211 0x26
> #define W1_THERM_DS18B20 0x28
> #define W1_FAMILY_DS2408 0x29
> #define W1_EEPROM_DS2431 0x2D
> --
> 2.13.0
>
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