/*-*- linux-c -*- * linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support * * Copyright (C) 2004 Antonino Daplas<adaplas@pol.net> * All Rights Reserved * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/pci.h> #include <linux/fb.h> #include "i810.h" #include "i810_regs.h" #include "i810_main.h" #include "../edid.h" /* bit locations in the registers */ #define SCL_DIR_MASK 0x0001 #define SCL_DIR 0x0002 #define SCL_VAL_MASK 0x0004 #define SCL_VAL_OUT 0x0008 #define SCL_VAL_IN 0x0010 #define SDA_DIR_MASK 0x0100 #define SDA_DIR 0x0200 #define SDA_VAL_MASK 0x0400 #define SDA_VAL_OUT 0x0800 #define SDA_VAL_IN 0x1000 #define DEBUG /* define this for verbose EDID parsing output */ #ifdef DEBUG #define DPRINTK(fmt, args...) printk(fmt,## args) #else #define DPRINTK(fmt, args...) #endif static void i810i2c_setscl(void *data, int state) { struct i810fb_i2c_chan *chan = data; struct i810fb_par *par = chan->par; u8 __iomem *mmio = par->mmio_start_virtual; i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK); i810_readl(mmio, chan->ddc_base); /* flush posted write */ } static void i810i2c_setsda(void *data, int state) { struct i810fb_i2c_chan *chan = data; struct i810fb_par *par = chan->par; u8 __iomem *mmio = par->mmio_start_virtual; i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK); i810_readl(mmio, chan->ddc_base); /* flush posted write */ } static int i810i2c_getscl(void *data) { struct i810fb_i2c_chan *chan = data; struct i810fb_par *par = chan->par; u8 __iomem *mmio = par->mmio_start_virtual; i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK); i810_writel(mmio, chan->ddc_base, 0); return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0); } static int i810i2c_getsda(void *data) { struct i810fb_i2c_chan *chan = data; struct i810fb_par *par = chan->par; u8 __iomem *mmio = par->mmio_start_virtual; i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK); i810_writel(mmio, chan->ddc_base, 0); return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0); } static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name) { int rc; strcpy(chan->adapter.name, name); chan->adapter.owner = THIS_MODULE; chan->adapter.algo_data = &chan->algo; chan->adapter.dev.parent = &chan->par->dev->dev; chan->adapter.id = I2C_HW_B_I810; chan->algo.setsda = i810i2c_setsda; chan->algo.setscl = i810i2c_setscl; chan->algo.getsda = i810i2c_getsda; chan->algo.getscl = i810i2c_getscl; chan->algo.udelay = 10; chan->algo.timeout = (HZ/2); chan->algo.data = chan; i2c_set_adapdata(&chan->adapter, chan); /* Raise SCL and SDA */ chan->algo.setsda(chan, 1); chan->algo.setscl(chan, 1); udelay(20); rc = i2c_bit_add_bus(&chan->adapter); if (rc == 0) dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name); else { dev_warn(&chan->par->dev->dev, "Failed to register I2C bus " "%s.\n", name); chan->par = NULL; } return rc; } void i810_create_i2c_busses(struct i810fb_par *par) { par->chan[0].par = par; par->chan[1].par = par; par->chan[2].par = par; par->chan[0].ddc_base = GPIOA; i810_setup_i2c_bus(&par->chan[0], "I810-DDC"); par->chan[1].ddc_base = GPIOB; i810_setup_i2c_bus(&par->chan[1], "I810-I2C"); par->chan[2].ddc_base = GPIOC; i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC"); } void i810_delete_i2c_busses(struct i810fb_par *par) { if (par->chan[0].par) i2c_del_adapter(&par->chan[0].adapter); par->chan[0].par = NULL; if (par->chan[1].par) i2c_del_adapter(&par->chan[1].adapter); par->chan[1].par = NULL; if (par->chan[2].par) i2c_del_adapter(&par->chan[2].adapter); par->chan[2].par = NULL; } int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn) { struct i810fb_par *par = info->par; u8 *edid = NULL; DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1); if (conn < par->ddc_num) { edid = fb_ddc_read(&par->chan[conn].adapter); } else { const u8 *e = fb_firmware_edid(info->device); if (e != NULL) { DPRINTK("i810-i2c: Getting EDID from BIOS\n"); edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL); } } *out_edid = edid; return (edid) ? 0 : 1; }