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VIDEO: cyberpro: add I2C support

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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: Ondrej Zary <linux@rainbow-software.org>
[removed i2c-id.h include - rmk]
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ondrej Zary
2010-08-11 21:48:03 +02:00
zatwierdzone przez Russell King
rodzic fcd3c7796c
commit e5dedf8d56
2 zmienionych plików z 136 dodań i 0 usunięć
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127
drivers/video/cyber2000fb.c
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@@ -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);