[deliverable/linux.git] / drivers / video / i810 / i810-i2c.c

 /*-*- 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->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;
}
Commit	Line	Data
74f6ae84 AD	1	/-- linux-c -*-
	2	* linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
	3	*
	4	* Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
	5	* All Rights Reserved
	6	*
	7	* This file is subject to the terms and conditions of the GNU General Public
	8	* License. See the file COPYING in the main directory of this archive for
	9	* more details.
	10	*/
74f6ae84 AD	11	#include <linux/module.h>
74f6ae84 AD	12	#include <linux/kernel.h>
74f6ae84 AD	13	#include <linux/delay.h>
	14	#include <linux/pci.h>
	15	#include <linux/fb.h>
	16	#include "i810.h"
	17	#include "i810_regs.h"
a0aa7d06	18	#include "i810_main.h"
74f6ae84 AD	19	#include "../edid.h"
74f6ae84 AD	20
74f6ae84 AD	21	/* bit locations in the registers */
	22	#define SCL_DIR_MASK 0x0001
	23	#define SCL_DIR 0x0002
	24	#define SCL_VAL_MASK 0x0004
	25	#define SCL_VAL_OUT 0x0008
	26	#define SCL_VAL_IN 0x0010
	27	#define SDA_DIR_MASK 0x0100
	28	#define SDA_DIR 0x0200
	29	#define SDA_VAL_MASK 0x0400
	30	#define SDA_VAL_OUT 0x0800
	31	#define SDA_VAL_IN 0x1000
	32
	33	#define DEBUG /* define this for verbose EDID parsing output */
	34
	35	#ifdef DEBUG
	36	#define DPRINTK(fmt, args...) printk(fmt,## args)
	37	#else
	38	#define DPRINTK(fmt, args...)
	39	#endif
	40
	41	static void i810i2c_setscl(void *data, int state)
	42	{
c019c0ec	43	struct i810fb_i2c_chan *chan = data;
74f6ae84	44	struct i810fb_par *par = chan->par;
be88ec74	45	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	46
5fab851e	47	i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) \| SCL_DIR \|
74f6ae84	48	SCL_DIR_MASK \| SCL_VAL_MASK);
5fab851e	49	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	50	}
	51
	52	static void i810i2c_setsda(void *data, int state)
	53	{
5fab851e	54	struct i810fb_i2c_chan *chan = data;
74f6ae84	55	struct i810fb_par *par = chan->par;
be88ec74	56	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	57
5fab851e	58	i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) \| SDA_DIR \|
74f6ae84	59	SDA_DIR_MASK \| SDA_VAL_MASK);
5fab851e	60	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	61	}
	62
	63	static int i810i2c_getscl(void *data)
	64	{
5fab851e	65	struct i810fb_i2c_chan *chan = data;
74f6ae84	66	struct i810fb_par *par = chan->par;
be88ec74	67	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	68
5fab851e AD	69	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
	70	i810_writel(mmio, chan->ddc_base, 0);
	71	return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
74f6ae84 AD	72	}
	73
	74	static int i810i2c_getsda(void *data)
	75	{
5fab851e	76	struct i810fb_i2c_chan *chan = data;
74f6ae84	77	struct i810fb_par *par = chan->par;
be88ec74	78	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	79
5fab851e AD	80	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
	81	i810_writel(mmio, chan->ddc_base, 0);
	82	return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
74f6ae84 AD	83	}
74f6ae84 AD	84
5fab851e	85	static int i810_setup_i2c_bus(struct i810fb_i2c_chan chan, const char name)
74f6ae84 AD	86	{
	87	int rc;
	88
	89	strcpy(chan->adapter.name, name);
	90	chan->adapter.owner = THIS_MODULE;
	91	chan->adapter.algo_data = &chan->algo;
	92	chan->adapter.dev.parent = &chan->par->dev->dev;
5fab851e AD	93	chan->algo.setsda = i810i2c_setsda;
	94	chan->algo.setscl = i810i2c_setscl;
	95	chan->algo.getsda = i810i2c_getsda;
	96	chan->algo.getscl = i810i2c_getscl;
74f6ae84	97	chan->algo.udelay = 10;
74f6ae84 AD	98	chan->algo.timeout = (HZ/2);
	99	chan->algo.data = chan;
	100
	101	i2c_set_adapdata(&chan->adapter, chan);
	102
	103	/* Raise SCL and SDA */
	104	chan->algo.setsda(chan, 1);
	105	chan->algo.setscl(chan, 1);
	106	udelay(20);
	107
	108	rc = i2c_bit_add_bus(&chan->adapter);
5fab851e	109
74f6ae84 AD	110	if (rc == 0)
74f6ae84 AD	111	dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
5fab851e	112	else {
74f6ae84 AD	113	dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
74f6ae84 AD	114	"%s.\n", name);
5fab851e AD	115	chan->par = NULL;
	116	}
	117
74f6ae84 AD	118	return rc;
	119	}
	120
	121	void i810_create_i2c_busses(struct i810fb_par *par)
	122	{
	123	par->chan[0].par = par;
	124	par->chan[1].par = par;
5fab851e AD	125	par->chan[2].par = par;
	126
	127	par->chan[0].ddc_base = GPIOA;
	128	i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
	129	par->chan[1].ddc_base = GPIOB;
	130	i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
	131	par->chan[2].ddc_base = GPIOC;
	132	i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
74f6ae84 AD	133	}
	134
	135	void i810_delete_i2c_busses(struct i810fb_par *par)
	136	{
	137	if (par->chan[0].par)
3269711b	138	i2c_del_adapter(&par->chan[0].adapter);
74f6ae84	139	par->chan[0].par = NULL;
5fab851e	140
74f6ae84	141	if (par->chan[1].par)
3269711b	142	i2c_del_adapter(&par->chan[1].adapter);
74f6ae84	143	par->chan[1].par = NULL;
5fab851e AD	144
5fab851e AD	145	if (par->chan[2].par)
3269711b	146	i2c_del_adapter(&par->chan[2].adapter);
5fab851e	147	par->chan[2].par = NULL;
74f6ae84 AD	148	}
74f6ae84 AD	149
74f6ae84 AD	150	int i810_probe_i2c_connector(struct fb_info info, u8 *out_edid, int conn)
	151	{
	152	struct i810fb_par *par = info->par;
	153	u8 *edid = NULL;
74f6ae84	154
00d340b9 ML	155	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
00d340b9 ML	156	if (conn < par->ddc_num) {
e80987f8	157	edid = fb_ddc_read(&par->chan[conn].adapter);
74f6ae84	158	} else {
5fab851e AD	159	const u8 *e = fb_firmware_edid(info->device);
	160
	161	if (e != NULL) {
	162	DPRINTK("i810-i2c: Getting EDID from BIOS\n");
bfba7b37	163	edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
5fab851e	164	}
74f6ae84 AD	165	}
74f6ae84 AD	166
7c518eb8	167	*out_edid = edid;
74f6ae84 AD	168
	169	return (edid) ? 0 : 1;
	170	}