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path: root/drivers/video/fbdev/aty/radeon_i2c.c
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Diffstat (limited to 'drivers/video/fbdev/aty/radeon_i2c.c')
-rw-r--r--drivers/video/fbdev/aty/radeon_i2c.c167
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;
+}
+