VIDEO: cyberpro: add support for video capture I2C

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 118 insertions, 14 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index e0c7edf6c82b..b20f0f81dc01 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -448,6 +448,15 @@ config FB_CYBER2000_DDC
           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_CYBER2000_I2C
+        bool "CyberPro 2000/2010/5000 I2C support"
+        depends on FB_CYBER2000 && I2C && ARCH_NETWINDER
+        select I2C_ALGOBIT
+        help
+          Enable support for the I2C video decoder interface on the
+          Integraphics CyberPro 20x0 and 5000 VGA chips.  This is used
+          on the Netwinder machines for the SAA7111 video capture.
+
 config FB_APOLLO
         bool
         depends on (FB = y) && APOLLO
diff --git a/drivers/video/cyber2000fb.c b/drivers/video/cyber2000fb.c
index eeccdb8f4848..27cb3b23c3da 100644
--- a/drivers/video/cyber2000fb.c
+++ b/drivers/video/cyber2000fb.c
@@ -47,7 +47,6 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/io.h>
-
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
 
@@ -99,6 +98,11 @@ struct cfb_info {
         struct i2c_adapter      ddc_adapter;
         struct i2c_algo_bit_data        ddc_algo;
 #endif
+
+#ifdef CONFIG_FB_CYBER2000_I2C
+        struct i2c_adapter      i2c_adapter;
+        struct i2c_algo_bit_data i2c_algo;
+#endif
 };
 
 static char *default_font = "Acorn8x8";
@@ -1131,6 +1135,11 @@ int cyber2000fb_attach(struct cyberpro_info *info, int idx)
 {
         if (int_cfb_info != NULL) {
                 info->dev             = int_cfb_info->dev;
+#ifdef CONFIG_FB_CYBER2000_I2C
+                info->i2c             = &int_cfb_info->i2c_adapter;
+#else
+                info->i2c             = NULL;
+#endif
                 info->regs            = int_cfb_info->regs;
                 info->fb              = int_cfb_info->fb.screen_base;
                 info->fb_size         = int_cfb_info->fb.fix.smem_len;
@@ -1251,6 +1260,86 @@ static int __devinit cyber2000fb_setup_ddc_bus(struct cfb_info *cfb)
 }
 #endif /* CONFIG_FB_CYBER2000_DDC */
 
+#ifdef CONFIG_FB_CYBER2000_I2C
+static void cyber2000fb_i2c_setsda(void *data, int state)
+{
+        struct cfb_info *cfb = data;
+        unsigned int latch2;
+
+        spin_lock(&cfb->reg_b0_lock);
+        latch2 = cyber2000_grphr(EXT_LATCH2, cfb);
+        latch2 &= EXT_LATCH2_I2C_CLKEN;
+        if (state)
+                latch2 |= EXT_LATCH2_I2C_DATEN;
+        cyber2000_grphw(EXT_LATCH2, latch2, cfb);
+        spin_unlock(&cfb->reg_b0_lock);
+}
+
+static void cyber2000fb_i2c_setscl(void *data, int state)
+{
+        struct cfb_info *cfb = data;
+        unsigned int latch2;
+
+        spin_lock(&cfb->reg_b0_lock);
+        latch2 = cyber2000_grphr(EXT_LATCH2, cfb);
+        latch2 &= EXT_LATCH2_I2C_DATEN;
+        if (state)
+                latch2 |= EXT_LATCH2_I2C_CLKEN;
+        cyber2000_grphw(EXT_LATCH2, latch2, cfb);
+        spin_unlock(&cfb->reg_b0_lock);
+}
+
+static int cyber2000fb_i2c_getsda(void *data)
+{
+        struct cfb_info *cfb = data;
+        int ret;
+
+        spin_lock(&cfb->reg_b0_lock);
+        ret = !!(cyber2000_grphr(EXT_LATCH2, cfb) & EXT_LATCH2_I2C_DAT);
+        spin_unlock(&cfb->reg_b0_lock);
+
+        return ret;
+}
+
+static int cyber2000fb_i2c_getscl(void *data)
+{
+        struct cfb_info *cfb = data;
+        int ret;
+
+        spin_lock(&cfb->reg_b0_lock);
+        ret = !!(cyber2000_grphr(EXT_LATCH2, cfb) & EXT_LATCH2_I2C_CLK);
+        spin_unlock(&cfb->reg_b0_lock);
+
+        return ret;
+}
+
+static int __devinit cyber2000fb_i2c_register(struct cfb_info *cfb)
+{
+        strlcpy(cfb->i2c_adapter.name, cfb->fb.fix.id,
+                sizeof(cfb->i2c_adapter.name));
+        cfb->i2c_adapter.owner = THIS_MODULE;
+        cfb->i2c_adapter.algo_data = &cfb->i2c_algo;
+        cfb->i2c_adapter.dev.parent = &cfb->dev->dev;
+        cfb->i2c_algo.setsda = cyber2000fb_i2c_setsda;
+        cfb->i2c_algo.setscl = cyber2000fb_i2c_setscl;
+        cfb->i2c_algo.getsda = cyber2000fb_i2c_getsda;
+        cfb->i2c_algo.getscl = cyber2000fb_i2c_getscl;
+        cfb->i2c_algo.udelay = 5;
+        cfb->i2c_algo.timeout = msecs_to_jiffies(100);
+        cfb->i2c_algo.data = cfb;
+
+        return i2c_bit_add_bus(&cfb->i2c_adapter);
+}
+
+static void cyber2000fb_i2c_unregister(struct cfb_info *cfb)
+{
+        i2c_del_adapter(&cfb->i2c_adapter);
+}
+#else
+#define cyber2000fb_i2c_register(cfb)   (0)
+#define cyber2000fb_i2c_unregister(cfb) do { } while (0)
+#endif
+
 /*
  * These parameters give
  * 640x480, hsync 31.5kHz, vsync 60Hz
@@ -1520,7 +1609,14 @@ static int __devinit cyberpro_common_probe(struct cfb_info *cfb)
 
         if (cfb->dev)
                 cfb->fb.device = &cfb->dev->dev;
+
+        err = cyber2000fb_i2c_register(cfb);
+        if (err)
+                goto failed;
+
         err = register_framebuffer(&cfb->fb);
+        if (err)
+                cyber2000fb_i2c_unregister(cfb);
 
 failed:
 #ifdef CONFIG_FB_CYBER2000_DDC
@@ -1530,6 +1626,16 @@ failed:
         return err;
 }
 
+static void __devexit cyberpro_common_remove(struct cfb_info *cfb)
+{
+        unregister_framebuffer(&cfb->fb);
+#ifdef CONFIG_FB_CYBER2000_DDC
+        if (cfb->ddc_registered)
+                i2c_del_adapter(&cfb->ddc_adapter);
+#endif
+        cyber2000fb_i2c_unregister(cfb);
+}
+
 static void cyberpro_common_resume(struct cfb_info *cfb)
 {
         cyberpro_init_hw(cfb);
@@ -1769,19 +1875,7 @@ static void __devexit cyberpro_pci_remove(struct pci_dev *dev)
         struct cfb_info *cfb = pci_get_drvdata(dev);
 
         if (cfb) {
-                /*
-                 * If unregister_framebuffer fails, then
-                 * we will be leaving hooks that could cause
-                 * oopsen laying around.
-                 */
-                if (unregister_framebuffer(&cfb->fb))
-                        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
+                cyberpro_common_remove(cfb);
                 iounmap(cfb->region);
                 cyberpro_free_fb_info(cfb);
 
diff --git a/drivers/video/cyber2000fb.h b/drivers/video/cyber2000fb.h
index de4fc43e51c1..814cce5acf12 100644
--- a/drivers/video/cyber2000fb.h
+++ b/drivers/video/cyber2000fb.h
@@ -465,6 +465,7 @@ struct cfb_info;
 
 struct cyberpro_info {
         struct pci_dev  *dev;
+        struct i2c_adapter *i2c;
         unsigned char   __iomem *regs;
         char            __iomem *fb;
         char            dev_name[32];