dm: cros_ec: Convert cros_ec LPC driver to driver model

This is the last driver to be converted. It requires an LPC bus and a
special check_version() method.

Signed-off-by: Simon Glass <sjg@chromium.org>

configs/chromebook_link_defconfig

@@ -10,3 +10,4 @@ CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
 CONFIG_FRAMEBUFFER_VESA_MODE_11A=y
 CONFIG_DM_PCI=y
+CONFIG_CROS_EC_LPC=y

drivers/misc/cros_ec.c

@@ -681,11 +681,23 @@ static int cros_ec_check_version(struct cros_ec_dev *dev)
 	struct ec_params_hello req;
 	struct ec_response_hello *resp;
 
+#ifdef CONFIG_DM_CROS_EC
+	struct dm_cros_ec_ops *ops;
+	int ret;
+
+	ops = dm_cros_ec_get_ops(dev->dev);
+	if (ops->check_version) {
+		ret = ops->check_version(dev->dev);
+		if (ret)
+			return ret;
+	}
+#else
 #ifdef CONFIG_CROS_EC_LPC
 	/* LPC has its own way of doing this */
 	if (dev->interface == CROS_EC_IF_LPC)
 		return cros_ec_lpc_check_version(dev);
 #endif
+#endif
 
 	/*
 	 * TODO(sjg@chromium.org).

drivers/misc/cros_ec_lpc.c

@@ -14,6 +14,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <command.h>
 #include <cros_ec.h>
 #include <asm/io.h>
@@ -40,10 +41,18 @@ static int wait_for_sync(struct cros_ec_dev *dev)
 	return 0;
 }
 
+#ifdef CONFIG_DM_CROS_EC
+int cros_ec_lpc_command(struct udevice *udev, uint8_t cmd, int cmd_version,
+		     const uint8_t *dout, int dout_len,
+		     uint8_t **dinp, int din_len)
+{
+	struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
+#else
 int cros_ec_lpc_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
 		     const uint8_t *dout, int dout_len,
 		     uint8_t **dinp, int din_len)
 {
+#endif
 	const int cmd_addr = EC_LPC_ADDR_HOST_CMD;
 	const int data_addr = EC_LPC_ADDR_HOST_DATA;
 	const int args_addr = EC_LPC_ADDR_HOST_ARGS;
@@ -178,7 +187,11 @@ int cros_ec_lpc_init(struct cros_ec_dev *dev, const void *blob)
  * seeing whether the EC sets the EC_HOST_ARGS_FLAG_FROM_HOST flag
  * in args when it responds.
  */
+#ifdef CONFIG_DM_CROS_EC
+static int cros_ec_lpc_check_version(struct udevice *dev)
+#else
 int cros_ec_lpc_check_version(struct cros_ec_dev *dev)
+#endif
 {
 	if (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) == 'E' &&
 			inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1)
@@ -192,3 +205,28 @@ int cros_ec_lpc_check_version(struct cros_ec_dev *dev)
 	printf("%s: ERROR: old EC interface not supported\n", __func__);
 	return -1;
 }
+
+#ifdef CONFIG_DM_CROS_EC
+static int cros_ec_probe(struct udevice *dev)
+{
+	return cros_ec_register(dev);
+}
+
+static struct dm_cros_ec_ops cros_ec_ops = {
+	.command = cros_ec_lpc_command,
+	.check_version = cros_ec_lpc_check_version,
+};
+
+static const struct udevice_id cros_ec_ids[] = {
+	{ .compatible = "google,cros-ec" },
+	{ }
+};
+
+U_BOOT_DRIVER(cros_ec_lpc) = {
+	.name		= "cros_ec",
+	.id		= UCLASS_CROS_EC,
+	.of_match	= cros_ec_ids,
+	.probe		= cros_ec_probe,
+	.ops		= &cros_ec_ops,
+};
+#endif