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authorOndrej Zary <linux@rainbow-software.org>2010-08-11 21:48:03 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-02-11 10:15:54 +0000
commite5dedf8d561fb309ba37003546025300678da549 (patch)
tree17f4d94ee08ab3c9dec6cbe81a97186119a389dc /drivers/video/cyber2000fb.c
parentfcd3c7796c62f6bf5300ee52a87b8654084c5ae4 (diff)
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: Ondrej Zary <linux@rainbow-software.org> [removed i2c-id.h include - rmk] Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/video/cyber2000fb.c')
-rw-r--r--drivers/video/cyber2000fb.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/video/cyber2000fb.c b/drivers/video/cyber2000fb.c
index e946741ba2e..87d2aafa92f 100644
--- a/drivers/video/cyber2000fb.c
+++ b/drivers/video/cyber2000fb.c
@@ -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);