[linux-2.6-block.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/config.h>
#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 "../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 = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                        __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOB, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
		    SCL_DIR_MASK | SCL_VAL_MASK);
	i810_readl(mmio, GPIOB);	/* flush posted write */
}

static void i810i2c_setsda(void *data, int state)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                        __iomem *mmio = par->mmio_start_virtual;

 	i810_writel(mmio, GPIOB, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
		    SDA_DIR_MASK | SDA_VAL_MASK);
	i810_readl(mmio, GPIOB);	/* flush posted write */
}

static int i810i2c_getscl(void *data)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                        __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOB, SCL_DIR_MASK);
	i810_writel(mmio, GPIOB, 0);
	return (0 != (i810_readl(mmio, GPIOB) & SCL_VAL_IN));
}

static int i810i2c_getsda(void *data)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                        __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOB, SDA_DIR_MASK);
	i810_writel(mmio, GPIOB, 0);
	return (0 != (i810_readl(mmio, GPIOB) & SDA_VAL_IN));
}

static void i810ddc_setscl(void *data, int state)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par       *par = chan->par;
	u8                      __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOA, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
		    SCL_DIR_MASK | SCL_VAL_MASK);
	i810_readl(mmio, GPIOA);	/* flush posted write */
}

static void i810ddc_setsda(void *data, int state)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                      __iomem *mmio = par->mmio_start_virtual;

 	i810_writel(mmio, GPIOA, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
		    SDA_DIR_MASK | SDA_VAL_MASK);
	i810_readl(mmio, GPIOA);	/* flush posted write */
}

static int i810ddc_getscl(void *data)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                      __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOA, SCL_DIR_MASK);
	i810_writel(mmio, GPIOA, 0);
	return (0 != (i810_readl(mmio, GPIOA) & SCL_VAL_IN));
}

static int i810ddc_getsda(void *data)
{
        struct i810fb_i2c_chan    *chan = (struct i810fb_i2c_chan *)data;
        struct i810fb_par         *par = chan->par;
	u8                      __iomem *mmio = par->mmio_start_virtual;

	i810_writel(mmio, GPIOA, SDA_DIR_MASK);
	i810_writel(mmio, GPIOA, 0);
	return (0 != (i810_readl(mmio, GPIOA) & SDA_VAL_IN));
}

#define I2C_ALGO_DDC_I810   0x0e0000
#define I2C_ALGO_I2C_I810   0x0f0000
static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name,
			      int conn)
{
        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;
	switch (conn) {
	case 1:
		chan->adapter.id                = I2C_ALGO_DDC_I810;
		chan->algo.setsda               = i810ddc_setsda;
		chan->algo.setscl               = i810ddc_setscl;
		chan->algo.getsda               = i810ddc_getsda;
		chan->algo.getscl               = i810ddc_getscl;
		break;
	case 2:
		chan->adapter.id                = I2C_ALGO_I2C_I810;
		chan->algo.setsda               = i810i2c_setsda;
		chan->algo.setscl               = i810i2c_setscl;
		chan->algo.getsda               = i810i2c_getsda;
		chan->algo.getscl               = i810i2c_getscl;
		break;
	}
	chan->algo.udelay               = 10;
	chan->algo.mdelay               = 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);
        return rc;
}

void i810_create_i2c_busses(struct i810fb_par *par)
{
        par->chan[0].par        = par;
	par->chan[1].par        = par;
	i810_setup_i2c_bus(&par->chan[0], "I810-DDC", 1);
	i810_setup_i2c_bus(&par->chan[1], "I810-I2C", 2);
}

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;
}

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);
	if (conn < 3) {
		for (i = 0; i < 3; i++) {
			/* Do the real work */
			edid = i810_do_probe_i2c_edid(&par->chan[conn-1]);
			if (edid)
				break;
		}
	} else {
		DPRINTK("i810-i2c: Getting EDID from BIOS\n");
		edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
		if (edid)
			memcpy(edid, fb_firmware_edid(info->device),
			       EDID_LENGTH);
	}

        if (out_edid)
                *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	*/
	11	#include <linux/config.h>
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/sched.h>
	15	#include <linux/delay.h>
	16	#include <linux/pci.h>
	17	#include <linux/fb.h>
	18	#include "i810.h"
	19	#include "i810_regs.h"
	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	{
	45	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	46	struct i810fb_par *par = chan->par;
be88ec74	47	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	48
	49	i810_writel(mmio, GPIOB, (state ? SCL_VAL_OUT : 0) \| SCL_DIR \|
	50	SCL_DIR_MASK \| SCL_VAL_MASK);
	51	i810_readl(mmio, GPIOB); /* flush posted write */
	52	}
	53
	54	static void i810i2c_setsda(void *data, int state)
	55	{
	56	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	57	struct i810fb_par *par = chan->par;
be88ec74	58	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	59
	60	i810_writel(mmio, GPIOB, (state ? SDA_VAL_OUT : 0) \| SDA_DIR \|
	61	SDA_DIR_MASK \| SDA_VAL_MASK);
	62	i810_readl(mmio, GPIOB); /* flush posted write */
	63	}
	64
	65	static int i810i2c_getscl(void *data)
	66	{
	67	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	68	struct i810fb_par *par = chan->par;
be88ec74	69	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	70
	71	i810_writel(mmio, GPIOB, SCL_DIR_MASK);
	72	i810_writel(mmio, GPIOB, 0);
	73	return (0 != (i810_readl(mmio, GPIOB) & SCL_VAL_IN));
	74	}
	75
	76	static int i810i2c_getsda(void *data)
	77	{
	78	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	79	struct i810fb_par *par = chan->par;
be88ec74	80	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	81
	82	i810_writel(mmio, GPIOB, SDA_DIR_MASK);
	83	i810_writel(mmio, GPIOB, 0);
	84	return (0 != (i810_readl(mmio, GPIOB) & SDA_VAL_IN));
	85	}
	86
	87	static void i810ddc_setscl(void *data, int state)
	88	{
	89	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	90	struct i810fb_par *par = chan->par;
be88ec74	91	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	92
	93	i810_writel(mmio, GPIOA, (state ? SCL_VAL_OUT : 0) \| SCL_DIR \|
	94	SCL_DIR_MASK \| SCL_VAL_MASK);
	95	i810_readl(mmio, GPIOA); /* flush posted write */
	96	}
	97
	98	static void i810ddc_setsda(void *data, int state)
	99	{
	100	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	101	struct i810fb_par *par = chan->par;
be88ec74	102	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	103
	104	i810_writel(mmio, GPIOA, (state ? SDA_VAL_OUT : 0) \| SDA_DIR \|
	105	SDA_DIR_MASK \| SDA_VAL_MASK);
	106	i810_readl(mmio, GPIOA); /* flush posted write */
	107	}
	108
	109	static int i810ddc_getscl(void *data)
	110	{
	111	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	112	struct i810fb_par *par = chan->par;
be88ec74	113	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	114
	115	i810_writel(mmio, GPIOA, SCL_DIR_MASK);
	116	i810_writel(mmio, GPIOA, 0);
	117	return (0 != (i810_readl(mmio, GPIOA) & SCL_VAL_IN));
	118	}
	119
	120	static int i810ddc_getsda(void *data)
	121	{
	122	struct i810fb_i2c_chan chan = (struct i810fb_i2c_chan )data;
	123	struct i810fb_par *par = chan->par;
be88ec74	124	u8 __iomem *mmio = par->mmio_start_virtual;
74f6ae84 AD	125
	126	i810_writel(mmio, GPIOA, SDA_DIR_MASK);
	127	i810_writel(mmio, GPIOA, 0);
	128	return (0 != (i810_readl(mmio, GPIOA) & SDA_VAL_IN));
	129	}
	130
	131	#define I2C_ALGO_DDC_I810 0x0e0000
	132	#define I2C_ALGO_I2C_I810 0x0f0000
	133	static int i810_setup_i2c_bus(struct i810fb_i2c_chan chan, const char name,
	134	int conn)
	135	{
	136	int rc;
	137
	138	strcpy(chan->adapter.name, name);
	139	chan->adapter.owner = THIS_MODULE;
	140	chan->adapter.algo_data = &chan->algo;
	141	chan->adapter.dev.parent = &chan->par->dev->dev;
	142	switch (conn) {
	143	case 1:
	144	chan->adapter.id = I2C_ALGO_DDC_I810;
	145	chan->algo.setsda = i810ddc_setsda;
	146	chan->algo.setscl = i810ddc_setscl;
	147	chan->algo.getsda = i810ddc_getsda;
	148	chan->algo.getscl = i810ddc_getscl;
	149	break;
	150	case 2:
	151	chan->adapter.id = I2C_ALGO_I2C_I810;
	152	chan->algo.setsda = i810i2c_setsda;
	153	chan->algo.setscl = i810i2c_setscl;
	154	chan->algo.getsda = i810i2c_getsda;
	155	chan->algo.getscl = i810i2c_getscl;
	156	break;
	157	}
	158	chan->algo.udelay = 10;
	159	chan->algo.mdelay = 10;
	160	chan->algo.timeout = (HZ/2);
	161	chan->algo.data = chan;
	162
	163	i2c_set_adapdata(&chan->adapter, chan);
	164
	165	/* Raise SCL and SDA */
	166	chan->algo.setsda(chan, 1);
	167	chan->algo.setscl(chan, 1);
	168	udelay(20);
	169
	170	rc = i2c_bit_add_bus(&chan->adapter);
	171	if (rc == 0)
	172	dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
	173	else
	174	dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
	175	"%s.\n", name);
	176	return rc;
	177	}
	178
	179	void i810_create_i2c_busses(struct i810fb_par *par)
	180	{
	181	par->chan[0].par = par;
	182	par->chan[1].par = par;
	183	i810_setup_i2c_bus(&par->chan[0], "I810-DDC", 1);
	184	i810_setup_i2c_bus(&par->chan[1], "I810-I2C", 2);
	185	}
	186
	187	void i810_delete_i2c_busses(struct i810fb_par *par)
	188	{
189	if (par->chan[0].par)
190	i2c_bit_del_bus(&par->chan[0].adapter);
191	par->chan[0].par = NULL;
192	if (par->chan[1].par)
193	i2c_bit_del_bus(&par->chan[1].adapter);
194	par->chan[1].par = NULL;
195	}
196
197	static u8 i810_do_probe_i2c_edid(struct i810fb_i2c_chan chan)
198	{
199	u8 start = 0x0;
200	struct i2c_msg msgs[] = {
201	{
202	.addr = I810_DDC,
203	.len = 1,
204	.buf = &start,
205	}, {
206	.addr = I810_DDC,
207	.flags = I2C_M_RD,
208	.len = EDID_LENGTH,
209	},
210	};
211	u8 *buf;
212
213	buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
214	if (!buf) {
215	DPRINTK("i810-i2c: Failed to allocate memory\n");
216	return NULL;
217	}
218	msgs[1].buf = buf;
219
220	if (i2c_transfer(&chan->adapter, msgs, 2) == 2) {
221	DPRINTK("i810-i2c: I2C Transfer successful\n");
222	return buf;
223	}
224	DPRINTK("i810-i2c: Unable to read EDID block.\n");
225	kfree(buf);
226	return NULL;
227	}
228
229	int i810_probe_i2c_connector(struct fb_info info, u8 *out_edid, int conn)
230	{
231	struct i810fb_par *par = info->par;
232	u8 *edid = NULL;
233	int i;
234
235	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn);
236	if (conn < 3) {
237	for (i = 0; i < 3; i++) {
238	/* Do the real work */
239	edid = i810_do_probe_i2c_edid(&par->chan[conn-1]);
240	if (edid)
241	break;
242	}
243	} else {
244	DPRINTK("i810-i2c: Getting EDID from BIOS\n");
245	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
246	if (edid)
247	memcpy(edid, fb_firmware_edid(info->device),
248	EDID_LENGTH);
249	}
250
251	if (out_edid)
252	*out_edid = edid;
253
254	return (edid) ? 0 : 1;
255	}
256
257