| /*-*- 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/config.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/delay.h> |
| #include <linux/pci.h> |
| #include <linux/fb.h> |
| #include "i810.h" |
| #include "i810_regs.h" |
| #include "../edid.h" |
| |
| #define I810_DDC 0x50 |
| /* 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 = (struct i810fb_i2c_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.mdelay = 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_bit_del_bus(&par->chan[0].adapter); |
| par->chan[0].par = NULL; |
| |
| if (par->chan[1].par) |
| i2c_bit_del_bus(&par->chan[1].adapter); |
| par->chan[1].par = NULL; |
| |
| if (par->chan[2].par) |
| i2c_bit_del_bus(&par->chan[2].adapter); |
| par->chan[2].par = NULL; |
| } |
| |
| static u8 *i810_do_probe_i2c_edid(struct i810fb_i2c_chan *chan) |
| { |
| u8 start = 0x0; |
| struct i2c_msg msgs[] = { |
| { |
| .addr = I810_DDC, |
| .len = 1, |
| .buf = &start, |
| }, { |
| .addr = I810_DDC, |
| .flags = I2C_M_RD, |
| .len = EDID_LENGTH, |
| }, |
| }; |
| u8 *buf; |
| |
| buf = kmalloc(EDID_LENGTH, GFP_KERNEL); |
| if (!buf) { |
| DPRINTK("i810-i2c: Failed to allocate memory\n"); |
| return NULL; |
| } |
| msgs[1].buf = buf; |
| |
| if (i2c_transfer(&chan->adapter, msgs, 2) == 2) { |
| DPRINTK("i810-i2c: I2C Transfer successful\n"); |
| return buf; |
| } |
| |
| DPRINTK("i810-i2c: Unable to read EDID block.\n"); |
| kfree(buf); |
| return NULL; |
| } |
| |
| int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn) |
| { |
| struct i810fb_par *par = info->par; |
| u8 *edid = NULL; |
| int i; |
| |
| DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn); |
| if (conn < 4) { |
| for (i = 0; i < 3; i++) { |
| /* Do the real work */ |
| edid = i810_do_probe_i2c_edid(&par->chan[conn-1]); |
| if (edid) |
| break; |
| } |
| } else { |
| const u8 *e = fb_firmware_edid(info->device); |
| |
| if (e != NULL) { |
| DPRINTK("i810-i2c: Getting EDID from BIOS\n"); |
| edid = kmalloc(EDID_LENGTH, GFP_KERNEL); |
| if (edid) |
| memcpy(edid, e, EDID_LENGTH); |
| } |
| } |
| |
| if (out_edid) |
| *out_edid = edid; |
| |
| return (edid) ? 0 : 1; |
| } |