[mirror_ubuntu-hirsute-kernel.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/sched.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"

#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 = 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.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+1);
	if (conn < par->ddc_num) {
		for (i = 0; i < 3; i++) {
			/* Do the real work */
			edid = i810_do_probe_i2c_edid(&par->chan[conn]);
			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);
		}
	}

	*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>
	12	#include <linux/kernel.h>
	13	#include <linux/sched.h>
	14	#include <linux/delay.h>
	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"
	21
	22	#define I810_DDC 0x50
	23	/* bit locations in the registers */
	24	#define SCL_DIR_MASK 0x0001
	25	#define SCL_DIR 0x0002
	26	#define SCL_VAL_MASK 0x0004
	27	#define SCL_VAL_OUT 0x0008
	28	#define SCL_VAL_IN 0x0010
	29	#define SDA_DIR_MASK 0x0100
	30	#define SDA_DIR 0x0200
	31	#define SDA_VAL_MASK 0x0400
	32	#define SDA_VAL_OUT 0x0800
	33	#define SDA_VAL_IN 0x1000
	34
	35	#define DEBUG /* define this for verbose EDID parsing output */
	36
	37	#ifdef DEBUG
	38	#define DPRINTK(fmt, args...) printk(fmt,## args)
	39	#else
	40	#define DPRINTK(fmt, args...)
	41	#endif
	42
	43	static void i810i2c_setscl(void *data, int state)
	44	{
c019c0ec	45	struct i810fb_i2c_chan *chan = data;
74f6ae84	46	struct i810fb_par *par = chan->par;
be88ec74	47	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	48
5fab851e	49	i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) \| SCL_DIR \|
74f6ae84	50	SCL_DIR_MASK \| SCL_VAL_MASK);
5fab851e	51	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	52	}
	53
	54	static void i810i2c_setsda(void *data, int state)
	55	{
5fab851e	56	struct i810fb_i2c_chan *chan = data;
74f6ae84	57	struct i810fb_par *par = chan->par;
be88ec74	58	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	59
5fab851e	60	i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) \| SDA_DIR \|
74f6ae84	61	SDA_DIR_MASK \| SDA_VAL_MASK);
5fab851e	62	i810_readl(mmio, chan->ddc_base); /* flush posted write */
74f6ae84 AD	63	}
	64
	65	static int i810i2c_getscl(void *data)
	66	{
5fab851e	67	struct i810fb_i2c_chan *chan = data;
74f6ae84	68	struct i810fb_par *par = chan->par;
be88ec74	69	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	70
5fab851e AD	71	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
	72	i810_writel(mmio, chan->ddc_base, 0);
	73	return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
74f6ae84 AD	74	}
	75
	76	static int i810i2c_getsda(void *data)
	77	{
5fab851e	78	struct i810fb_i2c_chan *chan = data;
74f6ae84	79	struct i810fb_par *par = chan->par;
be88ec74	80	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84	81
5fab851e AD	82	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
	83	i810_writel(mmio, chan->ddc_base, 0);
	84	return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
74f6ae84 AD	85	}
74f6ae84 AD	86
5fab851e	87	static int i810_setup_i2c_bus(struct i810fb_i2c_chan chan, const char name)
74f6ae84 AD	88	{
	89	int rc;
	90
	91	strcpy(chan->adapter.name, name);
	92	chan->adapter.owner = THIS_MODULE;
	93	chan->adapter.algo_data = &chan->algo;
	94	chan->adapter.dev.parent = &chan->par->dev->dev;
5fab851e AD	95	chan->adapter.id = I2C_HW_B_I810;
	96	chan->algo.setsda = i810i2c_setsda;
	97	chan->algo.setscl = i810i2c_setscl;
	98	chan->algo.getsda = i810i2c_getsda;
	99	chan->algo.getscl = i810i2c_getscl;
74f6ae84	100	chan->algo.udelay = 10;
74f6ae84 AD	101	chan->algo.timeout = (HZ/2);
	102	chan->algo.data = chan;
	103
	104	i2c_set_adapdata(&chan->adapter, chan);
	105
	106	/* Raise SCL and SDA */
	107	chan->algo.setsda(chan, 1);
	108	chan->algo.setscl(chan, 1);
	109	udelay(20);
	110
	111	rc = i2c_bit_add_bus(&chan->adapter);
5fab851e	112
74f6ae84 AD	113	if (rc == 0)
74f6ae84 AD	114	dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
5fab851e	115	else {
74f6ae84 AD	116	dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
74f6ae84 AD	117	"%s.\n", name);
5fab851e AD	118	chan->par = NULL;
	119	}
	120
74f6ae84 AD	121	return rc;
	122	}
	123
	124	void i810_create_i2c_busses(struct i810fb_par *par)
	125	{
	126	par->chan[0].par = par;
	127	par->chan[1].par = par;
5fab851e AD	128	par->chan[2].par = par;
	129
	130	par->chan[0].ddc_base = GPIOA;
	131	i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
	132	par->chan[1].ddc_base = GPIOB;
	133	i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
	134	par->chan[2].ddc_base = GPIOC;
	135	i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
74f6ae84 AD	136	}
	137
	138	void i810_delete_i2c_busses(struct i810fb_par *par)
	139	{
	140	if (par->chan[0].par)
	141	i2c_bit_del_bus(&par->chan[0].adapter);
	142	par->chan[0].par = NULL;
5fab851e	143
74f6ae84 AD	144	if (par->chan[1].par)
	145	i2c_bit_del_bus(&par->chan[1].adapter);
	146	par->chan[1].par = NULL;
5fab851e AD	147
	148	if (par->chan[2].par)
	149	i2c_bit_del_bus(&par->chan[2].adapter);
	150	par->chan[2].par = NULL;
74f6ae84 AD	151	}
	152
	153	static u8 i810_do_probe_i2c_edid(struct i810fb_i2c_chan chan)
	154	{
	155	u8 start = 0x0;
	156	struct i2c_msg msgs[] = {
	157	{
	158	.addr = I810_DDC,
	159	.len = 1,
	160	.buf = &start,
	161	}, {
	162	.addr = I810_DDC,
	163	.flags = I2C_M_RD,
	164	.len = EDID_LENGTH,
	165	},
	166	};
	167	u8 *buf;
	168
	169	buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
	170	if (!buf) {
	171	DPRINTK("i810-i2c: Failed to allocate memory\n");
	172	return NULL;
	173	}
	174	msgs[1].buf = buf;
	175
	176	if (i2c_transfer(&chan->adapter, msgs, 2) == 2) {
	177	DPRINTK("i810-i2c: I2C Transfer successful\n");
	178	return buf;
	179	}
5fab851e	180
74f6ae84 AD	181	DPRINTK("i810-i2c: Unable to read EDID block.\n");
	182	kfree(buf);
	183	return NULL;
	184	}
	185
	186	int i810_probe_i2c_connector(struct fb_info info, u8 *out_edid, int conn)
	187	{
	188	struct i810fb_par *par = info->par;
	189	u8 *edid = NULL;
	190	int i;
	191
00d340b9 ML	192	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
00d340b9 ML	193	if (conn < par->ddc_num) {
74f6ae84 AD	194	for (i = 0; i < 3; i++) {
74f6ae84 AD	195	/* Do the real work */
00d340b9	196	edid = i810_do_probe_i2c_edid(&par->chan[conn]);
74f6ae84 AD	197	if (edid)
	198	break;
	199	}
	200	} else {
5fab851e AD	201	const u8 *e = fb_firmware_edid(info->device);
	202
	203	if (e != NULL) {
	204	DPRINTK("i810-i2c: Getting EDID from BIOS\n");
	205	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
	206	if (edid)
	207	memcpy(edid, e, EDID_LENGTH);
	208	}
74f6ae84 AD	209	}
74f6ae84 AD	210
7c518eb8	211	*out_edid = edid;
74f6ae84 AD	212
	213	return (edid) ? 0 : 1;
	214	}