1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de> 4 */ 5 /* 6 * infrastructure for devices connected via I2C 7 */ 8 9 #ifndef __VIA_AUX_H__ 10 #define __VIA_AUX_H__ 11 12 13 #include <linux/list.h> 14 #include <linux/i2c.h> 15 #include <linux/fb.h> 16 17 18 struct via_aux_bus { 19 struct i2c_adapter *adap; /* the I2C device to access the bus */ 20 struct list_head drivers; /* drivers for devices on this bus */ 21 }; 22 23 struct via_aux_drv { 24 struct list_head chain; /* chain to support multiple drivers */ 25 26 struct via_aux_bus *bus; /* the I2C bus used */ 27 u8 addr; /* the I2C slave address */ 28 29 const char *name; /* human readable name of the driver */ 30 void *data; /* private data of this driver */ 31 32 void (*cleanup)(struct via_aux_drv *drv); 33 const struct fb_videomode* (*get_preferred_mode) 34 (struct via_aux_drv *drv); 35 }; 36 37 38 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap); 39 void via_aux_free(struct via_aux_bus *bus); 40 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus); 41 42 43 static inline bool via_aux_add(struct via_aux_drv *drv) 44 { 45 struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL); 46 47 if (!data) 48 return false; 49 50 *data = *drv; 51 list_add_tail(&data->chain, &data->bus->drivers); 52 return true; 53 } 54 55 static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf, 56 u8 len) 57 { 58 struct i2c_msg msg[2] = { 59 {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start}, 60 {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} }; 61 62 return i2c_transfer(drv->bus->adap, msg, 2) == 2; 63 } 64 65 66 /* probe functions of existing drivers - should only be called in via_aux.c */ 67 void via_aux_ch7301_probe(struct via_aux_bus *bus); 68 void via_aux_edid_probe(struct via_aux_bus *bus); 69 void via_aux_sii164_probe(struct via_aux_bus *bus); 70 void via_aux_vt1636_probe(struct via_aux_bus *bus); 71 void via_aux_vt1632_probe(struct via_aux_bus *bus); 72 void via_aux_vt1631_probe(struct via_aux_bus *bus); 73 void via_aux_vt1625_probe(struct via_aux_bus *bus); 74 void via_aux_vt1622_probe(struct via_aux_bus *bus); 75 void via_aux_vt1621_probe(struct via_aux_bus *bus); 76 77 78 #endif /* __VIA_AUX_H__ */ 79