VIDEO: cyberpro: add I2C support
Ondrej Zary [Wed, 11 Aug 2010 19:48:03 +0000 (21:48 +0200)]
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>

drivers/video/Kconfig
drivers/video/cyber2000fb.c

index 6bafb51..e0c7edf 100644 (file)
@@ -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
index e946741..87d2aaf 100644 (file)
@@ -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);