[PATCH 2/5] mfd: mp2629: Add support for mps battery charger

Saravanan Sekar
2020-03-12T17:27:19Z

mp2629 is a highly-integrated switching-mode battery charge management
device for single-cell Li-ion or Li-polymer battery.

Add MFD core enables chip access for ADC driver for battery readings,
and a power supply battery-charger driver

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
---
drivers/mfd/Kconfig | 43 +++++----------
drivers/mfd/Makefile | 4 +-
drivers/mfd/mp2629.c | 109 +++++++++++++++++++++++++++++++++++++
include/linux/mfd/mp2629.h | 34 ++++++++++++
4 files changed, 158 insertions(+), 32 deletions(-)
create mode 100644 drivers/mfd/mp2629.c
create mode 100644 include/linux/mfd/mp2629.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3c547ed575e6..6371ffb33a81 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
help
Select this if your MC13xxx is connected via an I2C bus.

+config MFD_MP2629
+ bool "Monolithic power system MP2629 ADC and Battery charger"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Select this option to enable support for Monolithic power system
+ Battery charger. This provides ADC, thermal, Battery charger power
+ management functions on the systems.
+
config MFD_MXS_LRADC
tristate "Freescale i.MX23/i.MX28 LRADC"
depends on ARCH_MXS || COMPILE_TEST
@@ -642,19 +651,6 @@ config MFD_IPAQ_MICRO
AT90LS8535 microcontroller flashed with a special iPAQ
firmware using the custom protocol implemented in this driver.

-config MFD_IQS62X
- tristate "Azoteq IQS620A/621/622/624/625 core support"
- depends on I2C
- select MFD_CORE
- select REGMAP_I2C
- help
- Say Y here if you want to build core support for the Azoteq IQS620A,
- IQS621, IQS622, IQS624 and IQS625 multi-function sensors. Additional
- options must be selected to enable device-specific functions.
-
- To compile this driver as a module, choose M here: the module will
- be called iqs62x.
-
config MFD_JANZ_CMODIO
tristate "Janz CMOD-IO PCI MODULbus Carrier Board"
select MFD_CORE
@@ -906,7 +902,6 @@ config MFD_CPCAP
tristate "Support for Motorola CPCAP"
depends on SPI
depends on OF || COMPILE_TEST
- select MFD_CORE
select REGMAP_SPI
select REGMAP_IRQ
help
@@ -1215,7 +1210,7 @@ config AB8500_CORE
chip. This connects to U8500 either on the SSP/SPI bus (deprecated
since hardware version v1.0) or the I2C bus via PRCMU. It also adds
the irq_chip parts for handling the Mixed Signal chip events.
- This chip embeds various other multimedia functionalities as well.
+ This chip embeds various other multimedia funtionalities as well.

config AB8500_DEBUG
bool "Enable debug info via debugfs"
@@ -1865,7 +1860,7 @@ config MFD_WM8994
has on board GPIO and regulator functionality which is
supported via the relevant subsystems. This driver provides
core support for the WM8994, in order to use the actual
- functionality of the device other drivers must be enabled.
+ functionaltiy of the device other drivers must be enabled.

config MFD_WM97xx
tristate "Wolfson Microelectronics WM97xx"
@@ -1878,7 +1873,7 @@ config MFD_WM97xx
designed for smartphone applications. As well as audio functionality
it has on board GPIO and a touchscreen functionality which is
supported via the relevant subsystems. This driver provides core
- support for the WM97xx, in order to use the actual functionality of
+ support for the WM97xx, in order to use the actual functionaltiy of
the device other drivers must be enabled.

config MFD_STW481X
@@ -1971,7 +1966,7 @@ config MFD_STPMIC1
Support for ST Microelectronics STPMIC1 PMIC. STPMIC1 has power on
key, watchdog and regulator functionalities which are supported via
the relevant subsystems. This driver provides core support for the
- STPMIC1. In order to use the actual functionality of the device other
+ STPMIC1. In order to use the actual functionaltiy of the device other
drivers must be enabled.

To compile this driver as a module, choose M here: the
@@ -1990,18 +1985,6 @@ config MFD_STMFX
additional drivers must be enabled in order to use the functionality
of the device.

-config MFD_WCD934X
- tristate "Support for WCD9340/WCD9341 Codec"
- depends on SLIMBUS
- select REGMAP
- select REGMAP_SLIMBUS
- select REGMAP_IRQ
- select MFD_CORE
- help
- Support for the Qualcomm WCD9340/WCD9341 Codec.
- This driver provides common support WCD934x audio codec and its
- associated Pin Controller, Soundwire Controller and Audio codec.
-
menu "Multimedia Capabilities Port drivers"
depends on ARCH_SA1100

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f935d10cbf0f..b91db03d041a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -58,7 +58,6 @@ endif
ifeq ($(CONFIG_MFD_CS47L24),y)
obj-$(CONFIG_MFD_ARIZONA) += cs47l24-tables.o
endif
-obj-$(CONFIG_MFD_WCD934X) += wcd934x.o
obj-$(CONFIG_MFD_WM8400) += wm8400-core.o
wm831x-objs := wm831x-core.o wm831x-irq.o wm831x-otp.o
wm831x-objs += wm831x-auxadc.o
@@ -170,6 +169,8 @@ obj-$(CONFIG_MFD_MAX8925) += max8925.o
obj-$(CONFIG_MFD_MAX8997) += max8997.o max8997-irq.o
obj-$(CONFIG_MFD_MAX8998) += max8998.o max8998-irq.o

+obj-$(CONFIG_MFD_MP2629) += mp2629.o
+
pcf50633-objs := pcf50633-core.o pcf50633-irq.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
@@ -226,7 +227,6 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o
-obj-$(CONFIG_MFD_IQS62X) += iqs62x.o
obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o
obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o
obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o
diff --git a/drivers/mfd/mp2629.c b/drivers/mfd/mp2629.c
new file mode 100644
index 000000000000..6b7a11555760
--- /dev/null
+++ b/drivers/mfd/mp2629.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MP2629 MFD Driver for ADC and battery charger
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mp2629.h>
+
+enum {
+ MP2629_MFD_ADC,
+ MP2629_MFD_CHARGER,
+ MP2629_MFD_MAX
+};
+
+static const struct mfd_cell mp2629mfd[] = {
+ [MP2629_MFD_ADC] = {
+ .name = "mp2629_adc",
+ .of_compatible = "mps,mp2629_adc",
+ },
+ [MP2629_MFD_CHARGER] = {
+ .name = "mp2629_charger",
+ .of_compatible = "mps,mp2629_charger",
+ }
+};
+
+static const struct regmap_config mp2629_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x17,
+};
+
+int mp2629_set_value(struct regmap *map, u8 reg, u8 mask, unsigned int val)
+{
+ return regmap_update_bits(map, reg, mask, val);
+}
+EXPORT_SYMBOL(mp2629_set_value);
+
+int mp2629_get_value(struct regmap *map, u8 reg, unsigned int *val)
+{
+ return regmap_read(map, reg, val);
+}
+EXPORT_SYMBOL(mp2629_get_value);
+
+static int mp2629_probe(struct i2c_client *client)
+{
+ struct mp2629_info *info;
+ int ret;
+
+ info = devm_kzalloc(&client->dev, sizeof(struct mp2629_info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->dev = &client->dev;
+ info->irq = client->irq;
+ i2c_set_clientdata(client, info);
+
+ info->regmap = devm_regmap_init_i2c(client, &mp2629_regmap_config);
+ if (IS_ERR(info->regmap)) {
+ dev_err(info->dev, "Failed to allocate regmap!\n");
+ return PTR_ERR(info->regmap);
+ }
+
+ ret = devm_mfd_add_devices(info->dev, -1, mp2629mfd,
+ ARRAY_SIZE(mp2629mfd), NULL,
+ 0, NULL);
+ if (ret)
+ dev_err(info->dev, "Failed to add mfd %d\n", ret);
+
+ return ret;
+}
+
+static const struct of_device_id mp2629_of_match[] = {
+ { .compatible = "mps,mp2629"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, mp2629_of_match);
+
+static const struct i2c_device_id mp2629_id[] = {
+ { "mp2629", },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mp2629_id);
+
+static struct i2c_driver mp2629_driver = {
+ .driver = {
+ .name = "mp2629",
+ .of_match_table = of_match_ptr(mp2629_of_match),
+ },
+ .probe_new = mp2629_probe,
+ .id_table = mp2629_id,
+};
+module_i2c_driver(mp2629_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
+MODULE_DESCRIPTION("MP2629 Battery charger mfd driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/mp2629.h b/include/linux/mfd/mp2629.h
new file mode 100644
index 000000000000..4af9defd0c45
--- /dev/null
+++ b/include/linux/mfd/mp2629.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * mp2629.h - register definitions for mp2629 charger
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ */
+
+#ifndef __MP2629_H__
+#define __MP2629_H__
+
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+
+struct mp2629_info {
+ struct device *dev;
+ struct regmap *regmap;
+ int irq;
+};
+
+enum mp2629_adc_chan {
+ MP2629_BATT_VOLT,
+ MP2629_SYSTEM_VOLT,
+ MP2629_INPUT_VOLT,
+ MP2629_BATT_CURRENT,
+ MP2629_INPUT_CURRENT,
+ MP2629_ADC_CHAN_END
+};
+
+int mp2629_set_value(struct regmap *map, u8 reg, u8 mask, unsigned int val);
+int mp2629_get_value(struct regmap *map, u8 reg, unsigned int *val);
+
+#endif
--
2.17.1