xref: /openbmc/linux/include/linux/mfd/ntxec.h (revision 8a15b4da)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright 2020 Jonathan Neuschäfer
4  *
5  * Register access and version information for the Netronix embedded
6  * controller.
7  */
8 
9 #ifndef NTXEC_H
10 #define NTXEC_H
11 
12 #include <linux/types.h>
13 
14 struct device;
15 struct regmap;
16 
17 struct ntxec {
18 	struct device *dev;
19 	struct regmap *regmap;
20 };
21 
22 /*
23  * Some registers, such as the battery status register (0x41), are in
24  * big-endian, but others only have eight significant bits, which are in the
25  * first byte transmitted over I2C (the MSB of the big-endian value).
26  * This convenience function converts an 8-bit value to 16-bit for use in the
27  * second kind of register.
28  */
ntxec_reg8(u8 value)29 static inline u16 ntxec_reg8(u8 value)
30 {
31 	return value << 8;
32 }
33 
34 /* Known firmware versions */
35 #define NTXEC_VERSION_KOBO_AURA	0xd726	/* found in Kobo Aura */
36 #define NTXEC_VERSION_TOLINO_SHINE2 0xf110 /* found in Tolino Shine 2 HD */
37 #define NTXEC_VERSION_TOLINO_VISION 0xe135 /* found in Tolino Vision, contains RTC, ADC, PWM, home pad */
38 #endif
39