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SubjectRe: [PATCH v5 1/7] mfd: Add support for DA9150 combined charger & fuel-gauge device
On Mon, 22 Dec 2014, Adam Thomson wrote:

> DA9150 is a combined Charger and Fuel-Gauge IC, with additional
> GPIO and GPADC functionality.
>
> Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
> ---
> drivers/mfd/Kconfig | 12 +
> drivers/mfd/Makefile | 2 +-
> drivers/mfd/da9150-core.c | 413 ++++++++++++
> include/linux/mfd/da9150/core.h | 68 ++
> include/linux/mfd/da9150/registers.h | 1155 ++++++++++++++++++++++++++++++++++
> 5 files changed, 1649 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mfd/da9150-core.c
> create mode 100644 include/linux/mfd/da9150/core.h
> create mode 100644 include/linux/mfd/da9150/registers.h
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2e6b731..56e80d2 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -195,6 +195,18 @@ config MFD_DA9063
> Additional drivers must be enabled in order to use the functionality
> of the device.
>
> +config MFD_DA9150
> + tristate "Dialog Semiconductor DA9150 Charger Fuel-Gauge chip"
> + depends on I2C=y
> + select MFD_CORE
> + select REGMAP_I2C
> + select REGMAP_IRQ
> + help
> + This adds support for the DA9150 integrated charger and fuel-gauge
> + chip. This driver provides common support for accessing the device.
> + Additional drivers must be enabled in order to use the specific
> + features of the device.
> +
> config MFD_DLN2
> tristate "Diolan DLN2 support"
> select MFD_CORE
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 53467e2..f06f4c6 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -113,7 +113,7 @@ obj-$(CONFIG_MFD_DA9055) += da9055.o
>
> da9063-objs := da9063-core.o da9063-irq.o da9063-i2c.o
> obj-$(CONFIG_MFD_DA9063) += da9063.o
> -
> +obj-$(CONFIG_MFD_DA9150) += da9150-core.o
> obj-$(CONFIG_MFD_MAX14577) += max14577.o
> obj-$(CONFIG_MFD_MAX77686) += max77686.o
> obj-$(CONFIG_MFD_MAX77693) += max77693.o
> diff --git a/drivers/mfd/da9150-core.c b/drivers/mfd/da9150-core.c
> new file mode 100644
> index 0000000..4d757b9
> --- /dev/null
> +++ b/drivers/mfd/da9150-core.c
> @@ -0,0 +1,413 @@
> +/*
> + * DA9150 Core MFD Driver
> + *
> + * Copyright (c) 2014 Dialog Semiconductor
> + *
> + * Author: Adam Thomson <Adam.Thomson.Opensource@diasemi.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.
> + */

[...]

> +u8 da9150_reg_read(struct da9150 *da9150, u16 reg)
> +{
> + int val, ret;
> +
> + ret = regmap_read(da9150->regmap, reg, &val);
> + if (ret)
> + dev_err(da9150->dev, "Failed to read from reg 0x%x: %d\n",
> + reg, ret);
> +
> + return (u8) val;
> +}
> +EXPORT_SYMBOL_GPL(da9150_reg_read);
> +
> +void da9150_reg_write(struct da9150 *da9150, u16 reg, u8 val)
> +{
> + int ret;
> +
> + ret = regmap_write(da9150->regmap, reg, val);
> + if (ret)
> + dev_err(da9150->dev, "Failed to write to reg 0x%x: %d\n",
> + reg, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_reg_write);
> +
> +void da9150_set_bits(struct da9150 *da9150, u16 reg, u8 mask, u8 val)
> +{
> + int ret;
> +
> + ret = regmap_update_bits(da9150->regmap, reg, mask, val);
> + if (ret)
> + dev_err(da9150->dev, "Failed to set bits in reg 0x%x: %d\n",
> + reg, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_set_bits);
> +
> +void da9150_bulk_read(struct da9150 *da9150, u16 reg, int count, u8 *buf)
> +{
> + int ret;
> +
> + ret = regmap_bulk_read(da9150->regmap, reg, buf, count);
> + if (ret)
> + dev_err(da9150->dev, "Failed to bulk read from reg 0x%x: %d\n",
> + reg, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_bulk_read);
> +
> +void da9150_bulk_write(struct da9150 *da9150, u16 reg, int count, const u8 *buf)
> +{
> + int ret;
> +
> + ret = regmap_raw_write(da9150->regmap, reg, buf, count);
> + if (ret)
> + dev_err(da9150->dev, "Failed to bulk write to reg 0x%x %d\n",
> + reg, ret);
> +}
> +EXPORT_SYMBOL_GPL(da9150_bulk_write);

I've never been a fan of this type of aggregation. Can you explain to
me what the point of them is?

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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