[GitHub/mt8127/android_kernel_alcatel_ttab.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;

	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	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
5fab851e	48	i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) \| SCL_DIR \|
74f6ae84	49	SCL_DIR_MASK \| SCL_VAL_MASK);
5fab851e	50	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	51	}
	52
	53	static void i810i2c_setsda(void *data, int state)
	54	{
5fab851e	55	struct i810fb_i2c_chan *chan = data;
74f6ae84	56	struct i810fb_par *par = chan->par;
be88ec74	57	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	58
5fab851e	59	i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) \| SDA_DIR \|
74f6ae84	60	SDA_DIR_MASK \| SDA_VAL_MASK);
5fab851e	61	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	62	}
	63
	64	static int i810i2c_getscl(void *data)
	65	{
5fab851e	66	struct i810fb_i2c_chan *chan = data;
74f6ae84	67	struct i810fb_par *par = chan->par;
be88ec74	68	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	69
5fab851e AD	70	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
	71	i810_writel(mmio, chan->ddc_base, 0);
	72	return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
74f6ae84 AD	73	}
	74
	75	static int i810i2c_getsda(void *data)
	76	{
5fab851e	77	struct i810fb_i2c_chan *chan = data;
74f6ae84	78	struct i810fb_par *par = chan->par;
be88ec74	79	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	80
5fab851e AD	81	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
	82	i810_writel(mmio, chan->ddc_base, 0);
	83	return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
74f6ae84 AD	84	}
74f6ae84 AD	85
5fab851e	86	static int i810_setup_i2c_bus(struct i810fb_i2c_chan chan, const char name)
74f6ae84 AD	87	{
	88	int rc;
	89
	90	strcpy(chan->adapter.name, name);
	91	chan->adapter.owner = THIS_MODULE;
	92	chan->adapter.algo_data = &chan->algo;
	93	chan->adapter.dev.parent = &chan->par->dev->dev;
5fab851e AD	94	chan->algo.setsda = i810i2c_setsda;
	95	chan->algo.setscl = i810i2c_setscl;
	96	chan->algo.getsda = i810i2c_getsda;
	97	chan->algo.getscl = i810i2c_getscl;
74f6ae84	98	chan->algo.udelay = 10;
74f6ae84 AD	99	chan->algo.timeout = (HZ/2);
	100	chan->algo.data = chan;
	101
	102	i2c_set_adapdata(&chan->adapter, chan);
	103
	104	/* Raise SCL and SDA */
	105	chan->algo.setsda(chan, 1);
	106	chan->algo.setscl(chan, 1);
	107	udelay(20);
	108
	109	rc = i2c_bit_add_bus(&chan->adapter);
5fab851e	110
74f6ae84 AD	111	if (rc == 0)
74f6ae84 AD	112	dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
5fab851e	113	else {
74f6ae84 AD	114	dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
74f6ae84 AD	115	"%s.\n", name);
5fab851e AD	116	chan->par = NULL;
	117	}
	118
74f6ae84 AD	119	return rc;
	120	}
	121
	122	void i810_create_i2c_busses(struct i810fb_par *par)
	123	{
	124	par->chan[0].par = par;
	125	par->chan[1].par = par;
5fab851e AD	126	par->chan[2].par = par;
	127
	128	par->chan[0].ddc_base = GPIOA;
	129	i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
	130	par->chan[1].ddc_base = GPIOB;
	131	i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
	132	par->chan[2].ddc_base = GPIOC;
	133	i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
74f6ae84 AD	134	}
	135
	136	void i810_delete_i2c_busses(struct i810fb_par *par)
	137	{
	138	if (par->chan[0].par)
3269711b	139	i2c_del_adapter(&par->chan[0].adapter);
74f6ae84	140	par->chan[0].par = NULL;
5fab851e	141
74f6ae84	142	if (par->chan[1].par)
3269711b	143	i2c_del_adapter(&par->chan[1].adapter);
74f6ae84	144	par->chan[1].par = NULL;
5fab851e AD	145
5fab851e AD	146	if (par->chan[2].par)
3269711b	147	i2c_del_adapter(&par->chan[2].adapter);
5fab851e	148	par->chan[2].par = NULL;
74f6ae84 AD	149	}
74f6ae84 AD	150
74f6ae84 AD	151	int i810_probe_i2c_connector(struct fb_info info, u8 *out_edid, int conn)
	152	{
	153	struct i810fb_par *par = info->par;
	154	u8 *edid = NULL;
74f6ae84	155
00d340b9 ML	156	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
00d340b9 ML	157	if (conn < par->ddc_num) {
e80987f8	158	edid = fb_ddc_read(&par->chan[conn].adapter);
74f6ae84	159	} else {
5fab851e AD	160	const u8 *e = fb_firmware_edid(info->device);
	161
	162	if (e != NULL) {
	163	DPRINTK("i810-i2c: Getting EDID from BIOS\n");
bfba7b37	164	edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
5fab851e	165	}
74f6ae84 AD	166	}
74f6ae84 AD	167
7c518eb8	168	*out_edid = edid;
74f6ae84 AD	169
	170	return (edid) ? 0 : 1;
	171	}