1 files changed, 167 insertions, 0 deletions

diff --git a/drivers/video/fbdev/aty/radeon_i2c.c b/drivers/video/fbdev/aty/radeon_i2c.c
new file mode 100644
index 000000000000..ab1d0fd76316
--- /dev/null
+++ b/drivers/video/fbdev/aty/radeon_i2c.c
@@ -0,0 +1,167 @@
+#include "radeonfb.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/io.h>
+
+#include <video/radeon.h>
+#include "../edid.h"
+
+static void radeon_gpio_setscl(void* data, int state)
+{
+        struct radeon_i2c_chan  *chan = data;
+        struct radeonfb_info    *rinfo = chan->rinfo;
+        u32                     val;
+        
+        val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
+        if (!state)
+                val |= VGA_DDC_CLK_OUT_EN;
+
+        OUTREG(chan->ddc_reg, val);
+        (void)INREG(chan->ddc_reg);
+}
+
+static void radeon_gpio_setsda(void* data, int state)
+{
+        struct radeon_i2c_chan  *chan = data;
+        struct radeonfb_info    *rinfo = chan->rinfo;
+        u32                     val;
+        
+        val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
+        if (!state)
+                val |= VGA_DDC_DATA_OUT_EN;
+
+        OUTREG(chan->ddc_reg, val);
+        (void)INREG(chan->ddc_reg);
+}
+
+static int radeon_gpio_getscl(void* data)
+{
+        struct radeon_i2c_chan  *chan = data;
+        struct radeonfb_info    *rinfo = chan->rinfo;
+        u32                     val;
+        
+        val = INREG(chan->ddc_reg);
+
+        return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
+}
+
+static int radeon_gpio_getsda(void* data)
+{
+        struct radeon_i2c_chan  *chan = data;
+        struct radeonfb_info    *rinfo = chan->rinfo;
+        u32                     val;
+        
+        val = INREG(chan->ddc_reg);
+
+        return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
+}
+
+static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
+{
+        int rc;
+
+        snprintf(chan->adapter.name, sizeof(chan->adapter.name),
+                 "radeonfb %s", name);
+        chan->adapter.owner             = THIS_MODULE;
+        chan->adapter.algo_data         = &chan->algo;
+        chan->adapter.dev.parent        = &chan->rinfo->pdev->dev;
+        chan->algo.setsda               = radeon_gpio_setsda;
+        chan->algo.setscl               = radeon_gpio_setscl;
+        chan->algo.getsda               = radeon_gpio_getsda;
+        chan->algo.getscl               = radeon_gpio_getscl;
+        chan->algo.udelay               = 10;
+        chan->algo.timeout              = 20;
+        chan->algo.data                 = chan; 
+        
+        i2c_set_adapdata(&chan->adapter, chan);
+        
+        /* Raise SCL and SDA */
+        radeon_gpio_setsda(chan, 1);
+        radeon_gpio_setscl(chan, 1);
+        udelay(20);
+
+        rc = i2c_bit_add_bus(&chan->adapter);
+        if (rc == 0)
+                dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
+        else
+                dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
+        return rc;
+}
+
+void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
+{
+        rinfo->i2c[0].rinfo     = rinfo;
+        rinfo->i2c[0].ddc_reg   = GPIO_MONID;
+#ifndef CONFIG_PPC
+        rinfo->i2c[0].adapter.class = I2C_CLASS_HWMON;
+#endif
+        radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
+
+        rinfo->i2c[1].rinfo     = rinfo;
+        rinfo->i2c[1].ddc_reg   = GPIO_DVI_DDC;
+        radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
+
+        rinfo->i2c[2].rinfo     = rinfo;
+        rinfo->i2c[2].ddc_reg   = GPIO_VGA_DDC;
+        radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
+
+        rinfo->i2c[3].rinfo     = rinfo;
+        rinfo->i2c[3].ddc_reg   = GPIO_CRT2_DDC;
+        radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
+}
+
+void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
+{
+        if (rinfo->i2c[0].rinfo)
+                i2c_del_adapter(&rinfo->i2c[0].adapter);
+        rinfo->i2c[0].rinfo = NULL;
+
+        if (rinfo->i2c[1].rinfo)
+                i2c_del_adapter(&rinfo->i2c[1].adapter);
+        rinfo->i2c[1].rinfo = NULL;
+
+        if (rinfo->i2c[2].rinfo)
+                i2c_del_adapter(&rinfo->i2c[2].adapter);
+        rinfo->i2c[2].rinfo = NULL;
+
+        if (rinfo->i2c[3].rinfo)
+                i2c_del_adapter(&rinfo->i2c[3].adapter);
+        rinfo->i2c[3].rinfo = NULL;
+}
+
+int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
+                               u8 **out_edid)
+{
+        u8 *edid;
+
+        edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
+
+        if (out_edid)
+                *out_edid = edid;
+        if (!edid) {
+                pr_debug("radeonfb: I2C (port %d) ... not found\n", conn);
+                return MT_NONE;
+        }
+        if (edid[0x14] & 0x80) {
+                /* Fix detection using BIOS tables */
+                if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
+                    (INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
+                        pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
+                        return MT_LCD;
+                } else {
+                        pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
+                        return MT_DFP;
+                }
+        }
+        pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn);
+        return MT_CRT;
+}
+