/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de> */ /* * infrastructure for devices connected via I2C */ #ifndef __VIA_AUX_H__ #define __VIA_AUX_H__ #include <linux/list.h> #include <linux/i2c.h> #include <linux/fb.h> struct via_aux_bus { struct i2c_adapter *adap; /* the I2C device to access the bus */ struct list_head drivers; /* drivers for devices on this bus */ }; struct via_aux_drv { struct list_head chain; /* chain to support multiple drivers */ struct via_aux_bus *bus; /* the I2C bus used */ u8 addr; /* the I2C slave address */ const char *name; /* human readable name of the driver */ void *data; /* private data of this driver */ void (*cleanup)(struct via_aux_drv *drv); const struct fb_videomode* (*get_preferred_mode) (struct via_aux_drv *drv); }; struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap); void via_aux_free(struct via_aux_bus *bus); const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus); static inline bool via_aux_add(struct via_aux_drv *drv) { struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL); if (!data) return false; *data = *drv; list_add_tail(&data->chain, &data->bus->drivers); return true; } static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf, u8 len) { struct i2c_msg msg[2] = { {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start}, {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} }; return i2c_transfer(drv->bus->adap, msg, 2) == 2; } /* probe functions of existing drivers - should only be called in via_aux.c */ void via_aux_ch7301_probe(struct via_aux_bus *bus); void via_aux_edid_probe(struct via_aux_bus *bus); void via_aux_sii164_probe(struct via_aux_bus *bus); void via_aux_vt1636_probe(struct via_aux_bus *bus); void via_aux_vt1632_probe(struct via_aux_bus *bus); void via_aux_vt1631_probe(struct via_aux_bus *bus); void via_aux_vt1625_probe(struct via_aux_bus *bus); void via_aux_vt1622_probe(struct via_aux_bus *bus); void via_aux_vt1621_probe(struct via_aux_bus *bus); #endif /* __VIA_AUX_H__ */