1 /* 2 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License as published by the Free Software Foundation; 7 * either version 2, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even 11 * the implied warranty of MERCHANTABILITY or FITNESS FOR 12 * A PARTICULAR PURPOSE.See the GNU General Public License 13 * for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 /* 21 * infrastructure for devices connected via I2C 22 */ 23 24 #ifndef __VIA_AUX_H__ 25 #define __VIA_AUX_H__ 26 27 28 #include <linux/list.h> 29 #include <linux/i2c.h> 30 #include <linux/fb.h> 31 32 33 struct via_aux_bus { 34 struct i2c_adapter *adap; /* the I2C device to access the bus */ 35 struct list_head drivers; /* drivers for devices on this bus */ 36 }; 37 38 struct via_aux_drv { 39 struct list_head chain; /* chain to support multiple drivers */ 40 41 struct via_aux_bus *bus; /* the I2C bus used */ 42 u8 addr; /* the I2C slave address */ 43 44 const char *name; /* human readable name of the driver */ 45 void *data; /* private data of this driver */ 46 47 void (*cleanup)(struct via_aux_drv *drv); 48 const struct fb_videomode* (*get_preferred_mode) 49 (struct via_aux_drv *drv); 50 }; 51 52 53 struct via_aux_bus *via_aux_probe(struct i2c_adapter *adap); 54 void via_aux_free(struct via_aux_bus *bus); 55 const struct fb_videomode *via_aux_get_preferred_mode(struct via_aux_bus *bus); 56 57 58 static inline bool via_aux_add(struct via_aux_drv *drv) 59 { 60 struct via_aux_drv *data = kmalloc(sizeof(*data), GFP_KERNEL); 61 62 if (!data) 63 return false; 64 65 *data = *drv; 66 list_add_tail(&data->chain, &data->bus->drivers); 67 return true; 68 } 69 70 static inline bool via_aux_read(struct via_aux_drv *drv, u8 start, u8 *buf, 71 u8 len) 72 { 73 struct i2c_msg msg[2] = { 74 {.addr = drv->addr, .flags = 0, .len = 1, .buf = &start}, 75 {.addr = drv->addr, .flags = I2C_M_RD, .len = len, .buf = buf} }; 76 77 return i2c_transfer(drv->bus->adap, msg, 2) == 2; 78 } 79 80 81 /* probe functions of existing drivers - should only be called in via_aux.c */ 82 void via_aux_ch7301_probe(struct via_aux_bus *bus); 83 void via_aux_edid_probe(struct via_aux_bus *bus); 84 void via_aux_sii164_probe(struct via_aux_bus *bus); 85 void via_aux_vt1636_probe(struct via_aux_bus *bus); 86 void via_aux_vt1632_probe(struct via_aux_bus *bus); 87 void via_aux_vt1631_probe(struct via_aux_bus *bus); 88 void via_aux_vt1625_probe(struct via_aux_bus *bus); 89 void via_aux_vt1622_probe(struct via_aux_bus *bus); 90 void via_aux_vt1621_probe(struct via_aux_bus *bus); 91 92 93 #endif /* __VIA_AUX_H__ */ 94