diff options
Diffstat (limited to 'drivers/video/fbdev/i810/i810-i2c.c')
| -rw-r--r-- | drivers/video/fbdev/i810/i810-i2c.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/fbdev/i810/i810-i2c.c b/drivers/video/fbdev/i810/i810-i2c.c new file mode 100644 index 000000000000..7db17d0d8a8c --- /dev/null +++ b/drivers/video/fbdev/i810/i810-i2c.c @@ -0,0 +1,175 @@ + /*-*- 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/gfp.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; + + if (state) + i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK | SCL_VAL_MASK); + else + i810_writel(mmio, chan->ddc_base, 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; + + if (state) + i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK | SDA_VAL_MASK); + else + i810_writel(mmio, chan->ddc_base, 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->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; +} |