Dump LVDS backlight info from bios_reader

Add LVDS backlight and power VBT structures and dump from the BIOS reader.

2 files changed, 72 insertions, 0 deletions

diff --git a/src/bios_reader/bios_reader.c b/src/bios_reader/bios_reader.c
index 3b880a7d..2a69d278 100644
--- a/src/bios_reader/bios_reader.c
+++ b/src/bios_reader/bios_reader.c
@@ -163,6 +163,39 @@ static void dump_general_features(void)
     free(block);
 }
 
+static void dump_backlight_info(void)
+{
+    struct bdb_block *block;
+    struct bdb_lvds_backlight *backlight;
+    struct blc_struct *blc;
+
+    block = find_section(BDB_LVDS_BACKLIGHT);
+
+    if (!block)
+	return;
+
+    backlight = block->data;
+
+    printf("Backlight info block:\n");
+
+    if (sizeof(struct blc_struct) != backlight->blcstruct_size) {
+	printf("\tBacklight struct sizes don't match (expected %d, got %d), skipping\n",
+	       sizeof(struct blc_struct), backlight->blcstruct_size);
+	return;
+    }
+
+    blc = &backlight->panels[panel_type];
+
+    printf("\tInverter type: %d\n", blc->inverter_type);
+    printf("\t     polarity: %d\n", blc->inverter_polarity);
+    printf("\t    GPIO pins: %d\n", blc->gpio_pins);
+    printf("\t  GMBUS speed: %d\n", blc->gmbus_speed);
+    printf("\t     PWM freq: %d\n", blc->pwm_freq);
+    printf("\tMinimum brightness: %d\n", blc->min_brightness);
+    printf("\tI2C slave addr: 0x%02x\n", blc->i2c_slave_addr);
+    printf("\tI2C command: 0x%02x\n", blc->i2c_cmd);
+}
+
 static void dump_general_definitions(void)
 {
     struct bdb_block *block;
@@ -524,6 +557,7 @@ int main(int argc, char **argv)
     dump_lvds_options();
     dump_lvds_data();
     dump_lvds_ptr_data();
+    dump_backlight_info();
 
     dump_driver_feature();
 
diff --git a/src/i830_bios.h b/src/i830_bios.h
index 8a3025e7..754fc86e 100644
--- a/src/i830_bios.h
+++ b/src/i830_bios.h
@@ -395,6 +395,44 @@ struct vch_bdb_22 {
     struct vch_panel_data   panels[16];
 } __attribute__((packed));
 
+#define BLC_INVERTER_TYPE_NONE 0
+#define BLC_INVERTER_TYPE_I2C 1
+#define BLC_INVERTER_TYPE_PWM 2
+
+#define BLC_GPIO_NONE 0
+#define BLC_GPIO_I2C 1
+#define BLC_GPIO_CRT_DDC 2
+#define BLC_GPIO_DVI_DDC 3
+#define BLC_GPIO_SDVO_I2C 5
+
+struct blc_struct {
+	uint8_t inverter_type:2;
+	uint8_t inverter_polarity:1; /* 1 means inverted (0 = max brightness) */
+	uint8_t gpio_pins:3;
+	uint8_t gmbus_speed:2;
+	uint16_t pwm_freq; /* in Hz */
+	uint8_t min_brightness; /* (0-255) */
+	uint8_t i2c_slave_addr;
+	uint8_t i2c_cmd;
+} __attribute__((packed));
+
+struct bdb_lvds_backlight {
+	uint8_t blcstruct_size;
+	struct blc_struct panels[16];
+} __attribute__((packed));
+
+struct bdb_lvds_power {
+	uint8_t dpst_enabled:1;
+	uint8_t pwr_prefs:3;
+	uint8_t rsvd1:3;
+	uint8_t als_enabled:1;
+	uint16_t als_backlight1;
+	uint16_t als_backlight2;
+	uint16_t als_backlight3;
+	uint16_t als_backlight4;
+	uint16_t als_backlight5;
+} __attribute__((packed));
+
 #define BDB_DRIVER_NO_LVDS	0
 #define BDB_DRIVER_INT_LVDS	1
 #define BDB_DRIVER_SDVO_LVDS	2