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Commit e5dedf8d authored by Ondrej Zary's avatar Ondrej Zary Committed by Russell King
Browse files

VIDEO: cyberpro: add I2C support 



Add I2C support for the DDC bus to cyber2000fb driver. This is only bus
support, driver does not use EDID.  Tested on two different CyberPro 2000
cards with i2cdetect and decode-edid.

Signed-off-by: default avatarOndrej Zary <linux@rainbow-software.org>
[removed i2c-id.h include - rmk]
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent fcd3c779

drivers/video/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -439,6 +439,15 @@ config FB_CYBER2000 
	  Say Y if you have a NetWinder or a graphics card containing this

	  device, otherwise say N.



config FB_CYBER2000_DDC

	bool "DDC for CyberPro support"

	depends on FB_CYBER2000

	select FB_DDC

	default y

	help

	  Say Y here if you want DDC support for your CyberPro graphics

	  card. This is only I2C bus support, driver does not use EDID.



config FB_APOLLO

	bool

	depends on (FB = y) && APOLLO

drivers/video/cyber2000fb.c

+127 −0
Original line number Diff line number Diff line
@@ -48,6 +48,9 @@ 
#include <linux/init.h>

#include <linux/io.h>



#include <linux/i2c.h>

#include <linux/i2c-algo-bit.h>



#include <asm/pgtable.h>

#include <asm/system.h>
@@ -88,6 +91,12 @@ struct cfb_info { 
	u_char			ramdac_powerdown;



	u32			pseudo_palette[16];

#ifdef CONFIG_FB_CYBER2000_DDC

	bool			ddc_registered;

	struct i2c_adapter	ddc_adapter;

	struct i2c_algo_bit_data	ddc_algo;

	spinlock_t		reg_b0_lock;

#endif

};



static char *default_font = "Acorn8x8";
@@ -494,6 +503,9 @@ static void cyber2000fb_set_timing(struct cfb_info *cfb, struct par_info *hw) 
	cyber2000_attrw(0x14, 0x00, cfb);



	/* PLL registers */

#ifdef CONFIG_FB_CYBER2000_DDC

	spin_lock(&cfb->reg_b0_lock);

#endif

	cyber2000_grphw(EXT_DCLK_MULT, hw->clock_mult, cfb);

	cyber2000_grphw(EXT_DCLK_DIV, hw->clock_div, cfb);

	cyber2000_grphw(EXT_MCLK_MULT, cfb->mclk_mult, cfb);
@@ -501,6 +513,9 @@ static void cyber2000fb_set_timing(struct cfb_info *cfb, struct par_info *hw) 
	cyber2000_grphw(0x90, 0x01, cfb);

	cyber2000_grphw(0xb9, 0x80, cfb);

	cyber2000_grphw(0xb9, 0x00, cfb);

#ifdef CONFIG_FB_CYBER2000_DDC

	spin_unlock(&cfb->reg_b0_lock);

#endif



	cfb->ramdac_ctrl = hw->ramdac;

	cyber2000fb_write_ramdac_ctrl(cfb);
@@ -1141,6 +1156,105 @@ void cyber2000fb_detach(int idx) 
}

EXPORT_SYMBOL(cyber2000fb_detach);



#ifdef CONFIG_FB_CYBER2000_DDC



#define DDC_REG		0xb0

#define DDC_SCL_OUT	(1 << 0)

#define DDC_SDA_OUT	(1 << 4)

#define DDC_SCL_IN	(1 << 2)

#define DDC_SDA_IN	(1 << 6)



static void cyber2000fb_enable_ddc(struct cfb_info *cfb)

{

	spin_lock(&cfb->reg_b0_lock);

	cyber2000fb_writew(0x1bf, 0x3ce, cfb);

}



static void cyber2000fb_disable_ddc(struct cfb_info *cfb)

{

	cyber2000fb_writew(0x0bf, 0x3ce, cfb);

	spin_unlock(&cfb->reg_b0_lock);

}





static void cyber2000fb_ddc_setscl(void *data, int val)

{

	struct cfb_info *cfb = data;

	unsigned char reg;



	cyber2000fb_enable_ddc(cfb);

	reg = cyber2000_grphr(DDC_REG, cfb);

	if (!val)	/* bit is inverted */

		reg |= DDC_SCL_OUT;

	else

		reg &= ~DDC_SCL_OUT;

	cyber2000_grphw(DDC_REG, reg, cfb);

	cyber2000fb_disable_ddc(cfb);

}



static void cyber2000fb_ddc_setsda(void *data, int val)

{

	struct cfb_info *cfb = data;

	unsigned char reg;



	cyber2000fb_enable_ddc(cfb);

	reg = cyber2000_grphr(DDC_REG, cfb);

	if (!val)	/* bit is inverted */

		reg |= DDC_SDA_OUT;

	else

		reg &= ~DDC_SDA_OUT;

	cyber2000_grphw(DDC_REG, reg, cfb);

	cyber2000fb_disable_ddc(cfb);

}



static int cyber2000fb_ddc_getscl(void *data)

{

	struct cfb_info *cfb = data;

	int retval;



	cyber2000fb_enable_ddc(cfb);

	retval = !!(cyber2000_grphr(DDC_REG, cfb) & DDC_SCL_IN);

	cyber2000fb_disable_ddc(cfb);



	return retval;

}



static int cyber2000fb_ddc_getsda(void *data)

{

	struct cfb_info *cfb = data;

	int retval;



	cyber2000fb_enable_ddc(cfb);

	retval = !!(cyber2000_grphr(DDC_REG, cfb) & DDC_SDA_IN);

	cyber2000fb_disable_ddc(cfb);



	return retval;

}



static int __devinit cyber2000fb_setup_ddc_bus(struct cfb_info *cfb)

{

	spin_lock_init(&cfb->reg_b0_lock);



	strlcpy(cfb->ddc_adapter.name, cfb->fb.fix.id,

		sizeof(cfb->ddc_adapter.name));

	cfb->ddc_adapter.owner		= THIS_MODULE;

	cfb->ddc_adapter.class		= I2C_CLASS_DDC;

	cfb->ddc_adapter.algo_data	= &cfb->ddc_algo;

	cfb->ddc_adapter.dev.parent	= &cfb->dev->dev;

	cfb->ddc_algo.setsda		= cyber2000fb_ddc_setsda;

	cfb->ddc_algo.setscl		= cyber2000fb_ddc_setscl;

	cfb->ddc_algo.getsda		= cyber2000fb_ddc_getsda;

	cfb->ddc_algo.getscl		= cyber2000fb_ddc_getscl;

	cfb->ddc_algo.udelay		= 10;

	cfb->ddc_algo.timeout		= 20;

	cfb->ddc_algo.data		= cfb;



	i2c_set_adapdata(&cfb->ddc_adapter, cfb);



	return i2c_bit_add_bus(&cfb->ddc_adapter);

}

#endif /* CONFIG_FB_CYBER2000_DDC */



/*

 * These parameters give

 * 640x480, hsync 31.5kHz, vsync 60Hz
@@ -1369,6 +1483,11 @@ static int __devinit cyberpro_common_probe(struct cfb_info *cfb) 
	cfb->fb.fix.mmio_len   = MMIO_SIZE;

	cfb->fb.screen_base    = cfb->region;



#ifdef CONFIG_FB_CYBER2000_DDC

	if (cyber2000fb_setup_ddc_bus(cfb) == 0)

		cfb->ddc_registered = true;

#endif



	err = -EINVAL;

	if (!fb_find_mode(&cfb->fb.var, &cfb->fb, NULL, NULL, 0,

			  &cyber2000fb_default_mode, 8)) {
@@ -1406,6 +1525,10 @@ static int __devinit cyberpro_common_probe(struct cfb_info *cfb) 
	err = register_framebuffer(&cfb->fb);



failed:

#ifdef CONFIG_FB_CYBER2000_DDC

	if (err && cfb->ddc_registered)

		i2c_del_adapter(&cfb->ddc_adapter);

#endif

	return err;

}
@@ -1657,6 +1780,10 @@ static void __devexit cyberpro_pci_remove(struct pci_dev *dev) 
			printk(KERN_WARNING "%s: danger Will Robinson, "

				"danger danger!  Oopsen imminent!\n",

				cfb->fb.fix.id);

#ifdef CONFIG_FB_CYBER2000_DDC

		if (cfb->ddc_registered)

			i2c_del_adapter(&cfb->ddc_adapter);

#endif

		iounmap(cfb->region);

		cyberpro_free_fb_info(cfb);