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Subject[PATCH 1/2] Add support for OneWire (W1) devices family 0x26 (MAX17211/MAX17215)
Date
Maxim Semiconductor MAX17211/MAX17215 single/multi-cell fuel gauge
monitor with M5 Fuel Gauge algorithm

Slave device provide software layer for access to internal registers
MAX17211/MAX17215 chip.
---
drivers/w1/slaves/Kconfig | 12 ++++
drivers/w1/slaves/Makefile | 1 +
drivers/w1/slaves/w1_max1721x.c | 121 ++++++++++++++++++++++++++++++++++++++++
drivers/w1/slaves/w1_max1721x.h | 101 +++++++++++++++++++++++++++++++++
drivers/w1/w1_family.h | 1 +
5 files changed, 236 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 cfe74d0..05467da 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -78,6 +78,18 @@ 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 1e9989a..1e9f942 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -10,6 +10,7 @@ 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 0000000..bb73e90
--- /dev/null
+++ b/drivers/w1/slaves/w1_max1721x.c
@@ -0,0 +1,121 @@
+/*
+ * 1-Wire implementation for the max17211 chip
+ *
+ * Copyright © 2017, Alex A. Mihaylov <minimumlaw@rambler.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"
+
+int w1_max1721x_reg_get(struct device *dev, uint16_t addr, uint16_t *val)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ int ret = -ENODEV;
+
+ if (addr > MAX1721X_MAX_REG_NR || addr < 0 || !val || !dev)
+ return -EFAULT;
+
+ mutex_lock(&sl->master->bus_mutex);
+
+ if (!w1_reset_select_slave(sl)) {
+ w1_write_8(sl->master, W1_MAX1721X_READ_DATA);
+ w1_write_8(sl->master, addr & 0x00FF);
+ w1_write_8(sl->master, addr>>8 & 0x00FF);
+ *val = w1_read_8(sl->master);
+ *val |= w1_read_8(sl->master)<<8;
+ ret = 0;
+ }
+
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(w1_max1721x_reg_get);
+
+int w1_max1721x_reg_set(struct device *dev, uint16_t addr, uint16_t val)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ int ret = -ENODEV;
+
+ if (addr > MAX1721X_MAX_REG_NR || addr < 0 || !dev)
+ return -EFAULT;
+
+ mutex_lock(&sl->master->bus_mutex);
+
+ if (!w1_reset_select_slave(sl)) {
+ w1_write_8(sl->master, W1_MAX1721X_READ_DATA);
+ w1_write_8(sl->master, addr & 0x00FF);
+ w1_write_8(sl->master, addr>>8 & 0x00FF);
+ w1_write_8(sl->master, val & 0x00FF);
+ w1_write_8(sl->master, val>>8 & 0x00FF);
+ ret = 0;
+ }
+
+ mutex_unlock(&sl->master->bus_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(w1_max1721x_reg_set);
+
+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@rambler.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 0000000..1deb3d3
--- /dev/null
+++ b/drivers/w1/slaves/w1_max1721x.h
@@ -0,0 +1,101 @@
+/*
+ * 1-Wire implementation for the max17211 chip
+ *
+ * Copyright © 2017, Alex A. Mihaylov <minimumlaw@rambler.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
+
+/* Number of valid register addresses */
+#define MAX1721X_MAX_REG_NR (0x1EF)
+
+/* 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 */
+
+/* Convert regs value to power_supply units */
+
+static inline int max172xx_time_to_ps(uint16_t reg)
+{
+ return reg * 5625 / 1000; /* in sec. */
+}
+
+static inline int max172xx_percent_to_ps(uint16_t reg)
+{
+ return reg / 256; /* in percent from 0 to 100 */
+}
+
+static inline int max172xx_voltage_to_ps(uint16_t reg)
+{
+ return reg * 1250; /* in uV */
+}
+
+static inline int max172xx_capacity_to_ps(uint16_t 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(uint16_t reg)
+{
+ return (int16_t)reg * 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(uint16_t reg)
+{
+ return (int16_t)reg * 156252;
+}
+
+extern int w1_max1721x_reg_get(struct device *dev, uint16_t addr,
+ uint16_t *val);
+extern int w1_max1721x_reg_set(struct device *dev, uint16_t addr,
+ uint16_t val);
+
+#endif /* !__w1_max17211_h__ */
diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
index 10a7a07..797c162 100644
--- a/drivers/w1/w1_family.h
+++ b/drivers/w1/w1_family.h
@@ -35,6 +35,7 @@
#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
--
2.8.4 (Apple Git-73)
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