| /* 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 target 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__ */ |