[U-Boot] [PATCH v4 12/16] dm: Add a demonstration/example driver
Simon Glass
sjg at chromium.org
Sat Oct 19 00:33:20 CEST 2013
As an example of how to write a uclass and a driver, provide a demo version
of each, accessible through the 'demo' command.
To use these with driver model, define CONFIG_CMD_DEMO and CONFIG_DM_DEMO.
The two demo drivers are enabled with CONFIG_DM_DEMO_SIMPLE and
CONFIG_DM_DEMO_SHAPE.
Signed-off-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Marek Vasut <marex at denx.de>
Signed-off-by: Pavel Herrmann <morpheus.ibis at gmail.com>
Signed-off-by: Viktor Křivák <viktor.krivak at gmail.com>
Signed-off-by: Tomas Hlavacek <tmshlvck at gmail.com>
---
Changes in v4:
- Remove duplicated .op line
Changes in v3:
- Fix up demo command help
- Update demo driver to use device tree
Changes in v2: None
Makefile | 1 +
common/Makefile | 1 +
common/cmd_demo.c | 115 ++++++++++++++++++++++++++++++++++++
drivers/demo/Makefile | 44 ++++++++++++++
drivers/demo/demo-pdata.c | 60 +++++++++++++++++++
drivers/demo/demo-shape.c | 143 +++++++++++++++++++++++++++++++++++++++++++++
drivers/demo/demo-simple.c | 60 +++++++++++++++++++
drivers/demo/demo-uclass.c | 73 +++++++++++++++++++++++
include/configs/sandbox.h | 4 ++
include/dm-demo.h | 49 ++++++++++++++++
10 files changed, 550 insertions(+)
create mode 100644 common/cmd_demo.c
create mode 100644 drivers/demo/Makefile
create mode 100644 drivers/demo/demo-pdata.c
create mode 100644 drivers/demo/demo-shape.c
create mode 100644 drivers/demo/demo-simple.c
create mode 100644 drivers/demo/demo-uclass.c
create mode 100644 include/dm-demo.h
diff --git a/Makefile b/Makefile
index c58aa5a..c78afa0 100644
--- a/Makefile
+++ b/Makefile
@@ -325,6 +325,7 @@ LIBS-y += post/libpost.o
LIBS-y += test/libtest.o
LIBS-$(CONFIG_DM) += drivers/core/libdm.o
LIBS-y += test/dm/libtestdm.o
+LIBS-$(CONFIG_DM_DEMO) += drivers/demo/libdemo.o
ifneq ($(CONFIG_OMAP_COMMON),)
LIBS-y += $(CPUDIR)/omap-common/libomap-common.o
diff --git a/common/Makefile b/common/Makefile
index 288690b..dbaa407 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -67,6 +67,7 @@ COBJS-$(CONFIG_CMD_CONSOLE) += cmd_console.o
COBJS-$(CONFIG_CMD_CPLBINFO) += cmd_cplbinfo.o
COBJS-$(CONFIG_DATAFLASH_MMC_SELECT) += cmd_dataflash_mmc_mux.o
COBJS-$(CONFIG_CMD_DATE) += cmd_date.o
+COBJS-$(CONFIG_CMD_DEMO) += cmd_demo.o
COBJS-$(CONFIG_CMD_SOUND) += cmd_sound.o
ifdef CONFIG_4xx
COBJS-$(CONFIG_CMD_SETGETDCR) += cmd_dcr.o
diff --git a/common/cmd_demo.c b/common/cmd_demo.c
new file mode 100644
index 0000000..6ec91f8
--- /dev/null
+++ b/common/cmd_demo.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <dm-demo.h>
+#include <asm/io.h>
+
+struct device *demo_dev;
+
+static int do_demo_hello(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ int ch = 0;
+
+ if (argc)
+ ch = *argv[0];
+
+ return demo_hello(demo_dev, ch);
+}
+
+static int do_demo_status(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ int status;
+ int ret;
+
+ ret = demo_status(demo_dev, &status);
+ if (ret)
+ return ret;
+
+ printf("Status: %d\n", status);
+
+ return 0;
+}
+
+int do_demo_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ struct device *dev;
+ int i, ret;
+
+ puts("Demo uclass entries:\n");
+
+ for (i = 0, ret = uclass_first_device(UCLASS_DEMO, &dev);
+ dev;
+ ret = uclass_next_device(&dev)) {
+ printf("entry %d - instance %08x, ops %08x, platform_data %08x\n",
+ i++, map_to_sysmem(dev),
+ map_to_sysmem(dev->driver->ops),
+ map_to_sysmem(dev->platform_data));
+ }
+
+ return cmd_process_error(cmdtp, ret);
+}
+
+static cmd_tbl_t demo_commands[] = {
+ U_BOOT_CMD_MKENT(list, 0, 1, do_demo_list, "", ""),
+ U_BOOT_CMD_MKENT(hello, 2, 1, do_demo_hello, "", ""),
+ U_BOOT_CMD_MKENT(status, 1, 1, do_demo_status, "", ""),
+};
+
+static int do_demo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ cmd_tbl_t *demo_cmd;
+ int devnum = 0;
+ int ret;
+
+ if (argc < 2)
+ return CMD_RET_USAGE;
+ demo_cmd = find_cmd_tbl(argv[1], demo_commands,
+ ARRAY_SIZE(demo_commands));
+ argc -= 2;
+ argv += 2;
+ if (!demo_cmd || argc > demo_cmd->maxargs)
+ return CMD_RET_USAGE;
+
+ if (argc) {
+ devnum = simple_strtoul(argv[0], NULL, 10);
+ ret = uclass_get_device(UCLASS_DEMO, devnum, &demo_dev);
+ if (ret)
+ return cmd_process_error(cmdtp, ret);
+ argc--;
+ argv++;
+ }
+
+ ret = demo_cmd->cmd(demo_cmd, flag, argc, argv);
+
+ return cmd_process_error(demo_cmd, ret);
+}
+
+U_BOOT_CMD(
+ demo, 4, 1, do_demo,
+ "Driver model (dm) demo operations",
+ "list List available demo devices\n"
+ "demo hello <num> [<char>] Say hello\n"
+ "demo status <num> Get demo device status"
+);
diff --git a/drivers/demo/Makefile b/drivers/demo/Makefile
new file mode 100644
index 0000000..5267659
--- /dev/null
+++ b/drivers/demo/Makefile
@@ -0,0 +1,44 @@
+#
+# Copyright (c) 2013 Google, Inc
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB := $(obj)libdemo.o
+
+COBJS-$(CONFIG_DM_DEMO) += demo-uclass.o demo-pdata.o
+COBJS-$(CONFIG_DM_DEMO_SIMPLE) += demo-simple.o
+COBJS-$(CONFIG_DM_DEMO_SHAPE) += demo-shape.o
+
+COBJS := $(COBJS-y)
+SRCS := $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS))
+
+all: $(LIB)
+
+$(LIB): $(obj).depend $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/demo/demo-pdata.c b/drivers/demo/demo-pdata.c
new file mode 100644
index 0000000..c04b26e
--- /dev/null
+++ b/drivers/demo/demo-pdata.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm-demo.h>
+
+static const struct dm_demo_pdata red_square = {
+ .colour = "red",
+ .sides = 4.
+};
+static const struct dm_demo_pdata green_triangle = {
+ .colour = "green",
+ .sides = 3.
+};
+static const struct dm_demo_pdata yellow_hexagon = {
+ .colour = "yellow",
+ .sides = 6.
+};
+
+U_BOOT_DEVICE(demo0) = {
+ .name = "demo_shape_drv",
+ .platform_data = &red_square,
+};
+
+U_BOOT_DEVICE(demo1) = {
+ .name = "demo_simple_drv",
+ .platform_data = &red_square,
+};
+
+U_BOOT_DEVICE(demo2) = {
+ .name = "demo_shape_drv",
+ .platform_data = &green_triangle,
+};
+
+U_BOOT_DEVICE(demo3) = {
+ .name = "demo_simple_drv",
+ .platform_data = &yellow_hexagon,
+};
+
+U_BOOT_DEVICE(demo4) = {
+ .name = "demo_shape_drv",
+ .platform_data = &yellow_hexagon,
+};
diff --git a/drivers/demo/demo-shape.c b/drivers/demo/demo-shape.c
new file mode 100644
index 0000000..918115a
--- /dev/null
+++ b/drivers/demo/demo-shape.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <dm-demo.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Shape size */
+#define WIDTH 8
+#define HEIGHT 6
+
+struct shape_data {
+ int num_chars; /* Number of non-space characters output so far */
+};
+
+/* Crazy little function to draw shapes on the console */
+static int shape_hello(struct device *dev, int ch)
+{
+ const struct dm_demo_pdata *pdata = dev->platform_data;
+ struct shape_data *data = dev->priv;
+ static const struct shape {
+ int start;
+ int end;
+ int dstart;
+ int dend;
+ } shapes[3] = {
+ { 0, 1, 0, 1 },
+ { 0, WIDTH, 0, 0 },
+ { HEIGHT / 2 - 1, WIDTH - HEIGHT / 2 + 1, -1, 1},
+ };
+ struct shape shape;
+ unsigned int index;
+ int line, pos, inside;
+ const char *colour = pdata->colour;
+ int first = 0;
+
+ if (!ch)
+ ch = pdata->default_char;
+ if (!ch)
+ ch = '@';
+
+ index = (pdata->sides / 2) - 1;
+ if (index >= ARRAY_SIZE(shapes))
+ return -EIO;
+ shape = shapes[index];
+
+ for (line = 0; line < HEIGHT; line++) {
+ first = 1;
+ for (pos = 0; pos < WIDTH; pos++) {
+ inside = pos >= shape.start && pos < shape.end;
+ if (inside) {
+ putc(first ? *colour++ : ch);
+ data->num_chars++;
+ first = 0;
+ if (!*colour)
+ colour = pdata->colour;
+ } else {
+ putc(' ');
+ }
+ }
+ putc('\n');
+ shape.start += shape.dstart;
+ shape.end += shape.dend;
+ if (shape.start < 0) {
+ shape.dstart = -shape.dstart;
+ shape.dend = -shape.dend;
+ shape.start += shape.dstart;
+ shape.end += shape.dend;
+ }
+ }
+
+ return 0;
+}
+
+static int shape_status(struct device *dev, int *status)
+{
+ struct shape_data *data = dev->priv;
+
+ *status = data->num_chars;
+ return 0;
+}
+
+static const struct demo_ops simple_ops = {
+ .hello = shape_hello,
+ .status = shape_status,
+};
+
+static int demo_shape_probe(struct device *dev)
+{
+ struct dm_demo_pdata *pdata = dev->platform_data;
+ int ret;
+
+ if (dev->of_offset < 0)
+ return 0;
+
+ /* Parse the data that is common with all demo devices */
+ ret = demo_parse_dt(dev);
+ if (ret)
+ return ret;
+
+ /* Parse the data that only we need */
+ pdata->default_char = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+ "character", '@');
+
+ return 0;
+}
+
+static const struct device_id demo_shape_id[] = {
+ { "demo-shape", 0 },
+ { },
+};
+
+U_BOOT_DRIVER(demo_shape_drv) = {
+ .name = "demo_shape_drv",
+ .of_match = demo_shape_id,
+ .id = UCLASS_DEMO,
+ .probe = demo_shape_probe,
+ .ops = &simple_ops,
+ .priv_auto_alloc_size = sizeof(struct shape_data),
+ .platform_data_auto_alloc_size = sizeof(struct dm_demo_pdata),
+};
diff --git a/drivers/demo/demo-simple.c b/drivers/demo/demo-simple.c
new file mode 100644
index 0000000..bc4524b
--- /dev/null
+++ b/drivers/demo/demo-simple.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm-demo.h>
+#include <asm/io.h>
+
+static int simple_hello(struct device *dev, int ch)
+{
+ const struct dm_demo_pdata *pdata = dev->platform_data;
+
+ printf("Hello from %08x: %s %d\n", map_to_sysmem(dev), pdata->colour,
+ pdata->sides);
+
+ return 0;
+}
+
+static const struct demo_ops simple_ops = {
+ .hello = simple_hello,
+};
+
+static int demo_shape_probe(struct device *dev)
+{
+ /* Parse the data that is common with all demo devices */
+ return demo_parse_dt(dev);
+}
+
+static const struct device_id demo_shape_id[] = {
+ { "demo-simple", 0 },
+ { },
+};
+
+U_BOOT_DRIVER(demo_simple_drv) = {
+ .name = "demo_simple_drv",
+ .of_match = demo_shape_id,
+ .id = UCLASS_DEMO,
+ .probe = demo_shape_probe,
+ .ops = &simple_ops,
+ .platform_data_auto_alloc_size = sizeof(struct dm_demo_pdata),
+};
diff --git a/drivers/demo/demo-uclass.c b/drivers/demo/demo-uclass.c
new file mode 100644
index 0000000..a7eab32
--- /dev/null
+++ b/drivers/demo/demo-uclass.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis at gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm-demo.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <linux/list.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+UCLASS_DRIVER(demo) = {
+ .id = UCLASS_DEMO,
+};
+
+int demo_hello(struct device *dev, int ch)
+{
+ const struct demo_ops *ops = device_get_ops(dev);
+
+ if (!ops->hello)
+ return -ENOSYS;
+
+ return ops->hello(dev, ch);
+}
+
+int demo_status(struct device *dev, int *status)
+{
+ const struct demo_ops *ops = device_get_ops(dev);
+
+ if (!ops->status)
+ return -ENOSYS;
+
+ return ops->status(dev, status);
+}
+
+int demo_parse_dt(struct device *dev)
+{
+ struct dm_demo_pdata *pdata = dev->platform_data;
+ int dn = dev->of_offset;
+
+ if (dev->of_offset < 0)
+ return 0;
+ pdata->sides = fdtdec_get_int(gd->fdt_blob, dn, "sides", 0);
+ pdata->colour = fdt_getprop(gd->fdt_blob, dn, "colour", NULL);
+ if (!pdata->sides || !pdata->colour) {
+ debug("%s: Invalid device tree data\n", __func__);
+ return -EINVAL;
+ }
+
+ return 0;
+}
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 8f594ac..7276d59 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -19,7 +19,11 @@
#define CONFIG_BOOTSTAGE
#define CONFIG_BOOTSTAGE_REPORT
#define CONFIG_DM
+#define CONFIG_CMD_DEMO
#define CONFIG_CMD_DM
+#define CONFIG_DM_DEMO
+#define CONFIG_DM_DEMO_SIMPLE
+#define CONFIG_DM_DEMO_SHAPE
#define CONFIG_DM_TEST
/* Number of bits in a C 'long' on this architecture */
diff --git a/include/dm-demo.h b/include/dm-demo.h
new file mode 100644
index 0000000..1041d29
--- /dev/null
+++ b/include/dm-demo.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __DM_DEMO_H
+#define __DM_DEMO_H
+
+#include <dm.h>
+
+/**
+ * struct dm_demo_pdata - configuration data for demo instance
+ *
+ * @colour: Color of the demo
+ * @sides: Numbers of sides
+ * @default_char: Default ASCII character to output (65 = 'A')
+ */
+struct dm_demo_pdata {
+ const char *colour;
+ int sides;
+ int default_char;
+};
+
+struct demo_ops {
+ int (*hello)(struct device *dev, int ch);
+ int (*status)(struct device *dev, int *status);
+};
+
+int demo_hello(struct device *dev, int ch);
+int demo_status(struct device *dev, int *status);
+int demo_list(void);
+
+int demo_parse_dt(struct device *dev);
+
+#endif
--
1.8.4
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