libpayload: find source of input characters

This change makes it possible for vboot to avoid an
exploit that could cause involuntary switch to dev mode.
It gives depthcharge/vboot some information on the
type of input device that generated a key.

BUG=chrome-os-partner:21729
TEST=manually tested for panther
BRANCH=none
CQ-DEPEND=CL:182420,CL:182241,CL:182946

Change-Id: I87bdac34bfc50f3adb0b35a2c57a8f95f4fbc35b
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://chromium-review.googlesource.com/182357
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Tested-by: Luigi Semenzato <semenzato@chromium.org>
Commit-Queue: Luigi Semenzato <semenzato@chromium.org>
Reviewed-on: http://review.coreboot.org/6003
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

payloads/libpayload/drivers/usb/usbhid.c

@@ -391,7 +391,8 @@ usb_hid_set_protocol (usbdev_t *dev, interface_descriptor_t *interface, hid_prot
 
 static struct console_input_driver cons = {
 	.havekey = usbhid_havechar,
-	.getchar = usbhid_getchar
+	.getchar = usbhid_getchar,
+	.input_type = CONSOLE_INPUT_TYPE_USB,
 };
 
 

payloads/libpayload/include/libpayload.h

@@ -247,12 +247,18 @@ int set_option_from_string(const struct nvram_accessor *nvram, struct cb_cmos_op
  * @defgroup console Console functions
  * @{
  */
+typedef enum {
+	CONSOLE_INPUT_TYPE_UNKNOWN = 0,
+	CONSOLE_INPUT_TYPE_USB,
+} console_input_type;
+
 void console_init(void);
 int putchar(unsigned int c);
 int puts(const char *s);
 int havekey(void);
 int getchar(void);
 int getchar_timeout(int *ms);
+console_input_type last_key_input_type(void);
 
 extern int last_putchar;
 
@@ -261,6 +267,7 @@ struct console_input_driver {
 	struct console_input_driver *next;
 	int (*havekey) (void);
 	int (*getchar) (void);
+	console_input_type input_type;
 };
 
 struct console_output_driver;

payloads/libpayload/libc/console.c

@@ -33,6 +33,7 @@
 
 struct console_output_driver *console_out;
 struct console_input_driver *console_in;
+static console_input_type last_getchar_input_type;
 
 void console_add_output_driver(struct console_output_driver *out)
 {
@@ -115,9 +116,11 @@ int getchar(void)
 #endif
 		struct console_input_driver *in;
 		for (in = console_in; in != 0; in = in->next)
-			if (in->havechar())
+			if (in->havechar()) {
+				last_getchar_input_type = in->input_type;
 				return in->getchar();
 			}
+	}
 }
 
 int getchar_timeout(int *ms)
@@ -135,3 +138,8 @@ int getchar_timeout(int *ms)
 
 	return 0;
 }
+
+console_input_type last_key_input_type(void)
+{
+	return last_getchar_input_type;
+}

src/mainboard/google/panther/devicetree.cb

@@ -115,7 +115,8 @@ chip northbridge/intel/haswell
 						io 0x60 = 0x700
 						io 0x62 = 0x710
 						irq 0x70 = 0x09
-						irq 0xf4 = 0x20
+						irq 0xf2 = 0x20
+						irq 0xf4 = 0x0
 						irq 0xfa = 0x12
 					end
 					device pnp 2e.7 on # GPIO

src/southbridge/intel/lynxpoint/lpc.c

@@ -195,6 +195,7 @@ static void pch_power_options(device_t dev)
 	 * If the option is not existent (Laptops), use Kconfig setting.
 	 */
 	get_option(&pwr_on, "power_on_after_fail");
+        pwr_on = MAINBOARD_POWER_KEEP;
 
 	reg16 = pci_read_config16(dev, GEN_PMCON_3);
 	reg16 &= 0xfffe;