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author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2021-01-25 00:41:23 +0300 |
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committer | Lee Jones <lee.jones@linaro.org> | 2021-03-10 14:06:27 +0300 |
commit | eceae583930666a69ab805eee8e81f9699bf6930 (patch) | |
tree | d485920d0d1d747bc129658b9782eccaaef0133c /include/linux/mfd/ntxec.h | |
parent | 01929c71334a075971b96837763d4dc0befc5fa5 (diff) | |
download | linux-eceae583930666a69ab805eee8e81f9699bf6930.tar.xz |
mfd: Add base driver for Netronix embedded controller
The Netronix embedded controller is a microcontroller found in some
e-book readers designed by the original design manufacturer Netronix,
Inc. It contains RTC, battery monitoring, system power management, and
PWM functionality.
This driver implements register access and version detection.
Third-party hardware documentation is available at:
https://github.com/neuschaefer/linux/wiki/Netronix-MSP430-embedded-controller
The EC supports interrupts, but the driver doesn't make use of them so
far.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'include/linux/mfd/ntxec.h')
-rw-r--r-- | include/linux/mfd/ntxec.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/include/linux/mfd/ntxec.h b/include/linux/mfd/ntxec.h new file mode 100644 index 000000000000..361204d125f1 --- /dev/null +++ b/include/linux/mfd/ntxec.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2020 Jonathan Neuschäfer + * + * Register access and version information for the Netronix embedded + * controller. + */ + +#ifndef NTXEC_H +#define NTXEC_H + +#include <linux/types.h> + +struct device; +struct regmap; + +struct ntxec { + struct device *dev; + struct regmap *regmap; +}; + +/* + * Some registers, such as the battery status register (0x41), are in + * big-endian, but others only have eight significant bits, which are in the + * first byte transmitted over I2C (the MSB of the big-endian value). + * This convenience function converts an 8-bit value to 16-bit for use in the + * second kind of register. + */ +static inline __be16 ntxec_reg8(u8 value) +{ + return value << 8; +} + +/* Known firmware versions */ +#define NTXEC_VERSION_KOBO_AURA 0xd726 /* found in Kobo Aura */ + +#endif |