[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/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;
}
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	13	#include <linux/delay.h>
5a0e3ad6	14	#include <linux/gfp.h>
74f6ae84 AD	15	#include <linux/pci.h>
	16	#include <linux/fb.h>
	17	#include "i810.h"
	18	#include "i810_regs.h"
a0aa7d06	19	#include "i810_main.h"
74f6ae84 AD	20	#include "../edid.h"
74f6ae84 AD	21
74f6ae84 AD	22	/* bit locations in the registers */
	23	#define SCL_DIR_MASK 0x0001
	24	#define SCL_DIR 0x0002
	25	#define SCL_VAL_MASK 0x0004
	26	#define SCL_VAL_OUT 0x0008
	27	#define SCL_VAL_IN 0x0010
	28	#define SDA_DIR_MASK 0x0100
	29	#define SDA_DIR 0x0200
	30	#define SDA_VAL_MASK 0x0400
	31	#define SDA_VAL_OUT 0x0800
	32	#define SDA_VAL_IN 0x1000
	33
	34	#define DEBUG /* define this for verbose EDID parsing output */
	35
	36	#ifdef DEBUG
	37	#define DPRINTK(fmt, args...) printk(fmt,## args)
	38	#else
	39	#define DPRINTK(fmt, args...)
	40	#endif
	41
	42	static void i810i2c_setscl(void *data, int state)
	43	{
c019c0ec	44	struct i810fb_i2c_chan *chan = data;
74f6ae84	45	struct i810fb_par *par = chan->par;
be88ec74	46	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	47
748103e7 SS	48	if (state)
	49	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK \| SCL_VAL_MASK);
	50	else
	51	i810_writel(mmio, chan->ddc_base, SCL_DIR \| SCL_DIR_MASK \| SCL_VAL_MASK);
5fab851e	52	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	53	}
	54
	55	static void i810i2c_setsda(void *data, int state)
	56	{
5fab851e	57	struct i810fb_i2c_chan *chan = data;
74f6ae84	58	struct i810fb_par *par = chan->par;
be88ec74	59	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	60
748103e7 SS	61	if (state)
	62	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK \| SDA_VAL_MASK);
	63	else
	64	i810_writel(mmio, chan->ddc_base, SDA_DIR \| SDA_DIR_MASK \| SDA_VAL_MASK);
5fab851e	65	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	66	}
	67
	68	static int i810i2c_getscl(void *data)
	69	{
5fab851e	70	struct i810fb_i2c_chan *chan = data;
74f6ae84	71	struct i810fb_par *par = chan->par;
be88ec74	72	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	73
5fab851e AD	74	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
	75	i810_writel(mmio, chan->ddc_base, 0);
	76	return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
74f6ae84 AD	77	}
	78
	79	static int i810i2c_getsda(void *data)
	80	{
5fab851e	81	struct i810fb_i2c_chan *chan = data;
74f6ae84	82	struct i810fb_par *par = chan->par;
be88ec74	83	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	84
5fab851e AD	85	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
	86	i810_writel(mmio, chan->ddc_base, 0);
	87	return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
74f6ae84 AD	88	}
74f6ae84 AD	89
5fab851e	90	static int i810_setup_i2c_bus(struct i810fb_i2c_chan chan, const char name)
74f6ae84 AD	91	{
	92	int rc;
	93
	94	strcpy(chan->adapter.name, name);
	95	chan->adapter.owner = THIS_MODULE;
	96	chan->adapter.algo_data = &chan->algo;
	97	chan->adapter.dev.parent = &chan->par->dev->dev;
5fab851e AD	98	chan->algo.setsda = i810i2c_setsda;
	99	chan->algo.setscl = i810i2c_setscl;
	100	chan->algo.getsda = i810i2c_getsda;
	101	chan->algo.getscl = i810i2c_getscl;
74f6ae84	102	chan->algo.udelay = 10;
74f6ae84 AD	103	chan->algo.timeout = (HZ/2);
	104	chan->algo.data = chan;
	105
	106	i2c_set_adapdata(&chan->adapter, chan);
	107
	108	/* Raise SCL and SDA */
	109	chan->algo.setsda(chan, 1);
	110	chan->algo.setscl(chan, 1);
	111	udelay(20);
	112
	113	rc = i2c_bit_add_bus(&chan->adapter);
5fab851e	114
74f6ae84 AD	115	if (rc == 0)
74f6ae84 AD	116	dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
5fab851e	117	else {
74f6ae84 AD	118	dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
74f6ae84 AD	119	"%s.\n", name);
5fab851e AD	120	chan->par = NULL;
	121	}
	122
74f6ae84 AD	123	return rc;
	124	}
	125
	126	void i810_create_i2c_busses(struct i810fb_par *par)
	127	{
	128	par->chan[0].par = par;
	129	par->chan[1].par = par;
5fab851e AD	130	par->chan[2].par = par;
	131
	132	par->chan[0].ddc_base = GPIOA;
	133	i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
	134	par->chan[1].ddc_base = GPIOB;
	135	i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
	136	par->chan[2].ddc_base = GPIOC;
	137	i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
74f6ae84 AD	138	}
	139
	140	void i810_delete_i2c_busses(struct i810fb_par *par)
	141	{
	142	if (par->chan[0].par)
3269711b	143	i2c_del_adapter(&par->chan[0].adapter);
74f6ae84	144	par->chan[0].par = NULL;
5fab851e	145
74f6ae84	146	if (par->chan[1].par)
3269711b	147	i2c_del_adapter(&par->chan[1].adapter);
74f6ae84	148	par->chan[1].par = NULL;
5fab851e AD	149
5fab851e AD	150	if (par->chan[2].par)
3269711b	151	i2c_del_adapter(&par->chan[2].adapter);
5fab851e	152	par->chan[2].par = NULL;
74f6ae84 AD	153	}
74f6ae84 AD	154
74f6ae84 AD	155	int i810_probe_i2c_connector(struct fb_info info, u8 *out_edid, int conn)
	156	{
	157	struct i810fb_par *par = info->par;
	158	u8 *edid = NULL;
74f6ae84	159
00d340b9 ML	160	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
00d340b9 ML	161	if (conn < par->ddc_num) {
e80987f8	162	edid = fb_ddc_read(&par->chan[conn].adapter);
74f6ae84	163	} else {
5fab851e AD	164	const u8 *e = fb_firmware_edid(info->device);
	165
	166	if (e != NULL) {
	167	DPRINTK("i810-i2c: Getting EDID from BIOS\n");
bfba7b37	168	edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
5fab851e	169	}
74f6ae84 AD	170	}
74f6ae84 AD	171
7c518eb8	172	*out_edid = edid;
74f6ae84 AD	173
	174	return (edid) ? 0 : 1;
	175	}