cmd: Add 'touch' command to enumerate touchpanel devices

This command can be used to list and access devices with uclass
UCLASS_TOUCHPANEL.

Signed-off-by: Ondrej Jirman <megous@megous.com>

cmd/Kconfig

@@ -1204,6 +1204,12 @@ config CMD_TSI148
 	  This provides various sub-commands to initialise and configure the
 	  Turndra tsi148 device. See the command help for full details.
 
+config CMD_TOUCH
+	bool "touch - Read input from touchpanel"
+	select DM_TOUCHPANEL
+	help
+	  Shows list of touches on the touch panel device.
+
 config CMD_UNIVERSE
 	bool "universe - Command to set up the Turndra Universe controller"
 	help

cmd/Makefile

@@ -129,6 +129,7 @@ obj-$(CONFIG_CMD_STRINGS) += strings.o
 obj-$(CONFIG_CMD_SMC) += smccc.o
 obj-$(CONFIG_CMD_TERMINAL) += terminal.o
 obj-$(CONFIG_CMD_TIME) += time.o
+obj-$(CONFIG_CMD_TOUCH) += touch.o
 obj-$(CONFIG_CMD_TRACE) += trace.o
 obj-$(CONFIG_HUSH_PARSER) += test.o
 obj-$(CONFIG_CMD_TPM) += tpm-common.o

cmd/touch.c

@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ */
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <touchpanel.h>
+
+static int do_touch_list(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_first_device_err(UCLASS_TOUCHPANEL, &dev);
+	if (ret) {
+		printf("No available touchpanel device\n");
+		return CMD_RET_FAILURE;
+	}
+
+	do {
+		printf("- %s\n", dev->name);
+
+		ret = uclass_next_device(&dev);
+		if (ret)
+			return CMD_RET_FAILURE;
+	} while (dev);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_touch_info(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	struct touchpanel_priv *uc_priv;
+	struct udevice *dev;
+	int ret;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	ret = uclass_get_device_by_name(UCLASS_TOUCHPANEL, argv[1], &dev);
+	if (ret) {
+		printf("Unknown touchpanel device %s\n", argv[1]);
+		return CMD_RET_FAILURE;
+	}
+
+	uc_priv = dev_get_uclass_priv(dev);
+
+	printf("Touchpanel Device '%s' :\n", argv[1]);
+	printf("size_x: %d\n", uc_priv->size_x);
+	printf("size_y: %d\n", uc_priv->size_y);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_touch_get(cmd_tbl_t *cmdtp, int flag, int argc,
+			char *const argv[])
+{
+	//struct touchpanel_priv *uc_priv;
+	struct touchpanel_touch touches[10];
+	struct udevice *dev;
+	int ret, i;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	ret = uclass_get_device_by_name(UCLASS_TOUCHPANEL, argv[1], &dev);
+	if (ret) {
+		printf("Unknown touchpanel device %s\n", argv[1]);
+		return CMD_RET_FAILURE;
+	}
+
+	//uc_priv = dev_get_uclass_priv(dev);
+
+	printf("Touchpanel Device '%s' :\n", argv[1]);
+
+	ret = touchpanel_start(dev);
+	if (ret < 0) {
+		printf("Failed to start %s, err=%d\n", argv[1], ret);
+		return CMD_RET_FAILURE;
+	}
+
+	ret = touchpanel_get_touches(dev, touches, ARRAY_SIZE(touches));
+	if (ret < 0) {
+		printf("Failed to get touches from %s, err=%d\n", argv[1], ret);
+		return CMD_RET_FAILURE;
+	}
+
+        for (i = 0; i < ret; i++) {
+		printf("touch: id=%d x=%d y=%d\n", touches[i].id, touches[i].x,
+		       touches[i].y);
+	}
+
+	ret = touchpanel_stop(dev);
+	if (ret < 0) {
+		printf("Failed to stop %s, err=%d\n", argv[1], ret);
+		return CMD_RET_FAILURE;
+	}
+
+	return CMD_RET_SUCCESS;
+}
+
+static cmd_tbl_t cmd_touch_sub[] = {
+	U_BOOT_CMD_MKENT(list, 1, 1, do_touch_list, "", ""),
+	U_BOOT_CMD_MKENT(info, 2, 1, do_touch_info, "", ""),
+	U_BOOT_CMD_MKENT(get, 2, 1, do_touch_get, "", ""),
+};
+
+static int do_touch(cmd_tbl_t *cmdtp, int flag, int argc,
+		  char *const argv[])
+{
+	cmd_tbl_t *c;
+
+	if (argc < 2)
+		return CMD_RET_USAGE;
+
+	/* Strip off leading 'touch' command argument */
+	argc--;
+	argv++;
+
+	c = find_cmd_tbl(argv[0], &cmd_touch_sub[0], ARRAY_SIZE(cmd_touch_sub));
+
+	if (c)
+		return c->cmd(cmdtp, flag, argc, argv);
+	else
+		return CMD_RET_USAGE;
+}
+
+static char touch_help_text[] =
+	"list - list touchpanel devices\n"
+	"touch info <name> - Get touchpanel device info\n"
+	"touch get <name> - Get touches";
+
+U_BOOT_CMD(touch, 4, 1, do_touch, "Touchpanel sub-system", touch_help_text);