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authorSimon Glass <sjg@chromium.org>2015-01-05 20:05:31 -0700
committerSimon Glass <sjg@chromium.org>2015-01-29 17:09:51 -0700
commita02af4aeece40e93bc7d79cd5dc912409efb7020 (patch)
tree799cf6f844e86be0164e4cc1649b62d1c9911eb5 /drivers
parent5d1c17e9a5803af9c65966e469437735ac29659e (diff)
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dm: demo: Add a simple GPIO demonstration
Add a new 'demo light' command which uses GPIOs to control imaginary lights. Each light is assigned a bit number in the overall value. This provides an example driver for using the new GPIO API. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/demo/demo-shape.c71
-rw-r--r--drivers/demo/demo-uclass.c20
2 files changed, 91 insertions, 0 deletions
diff --git a/drivers/demo/demo-shape.c b/drivers/demo/demo-shape.c
index 3fa9c59..d908736 100644
--- a/drivers/demo/demo-shape.c
+++ b/drivers/demo/demo-shape.c
@@ -11,6 +11,7 @@
#include <malloc.h>
#include <dm-demo.h>
#include <asm/io.h>
+#include <asm/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -20,6 +21,8 @@ DECLARE_GLOBAL_DATA_PTR;
struct shape_data {
int num_chars; /* Number of non-space characters output so far */
+ struct gpio_desc gpio_desc[8];
+ int gpio_count;
};
/* Crazy little function to draw shapes on the console */
@@ -89,9 +92,52 @@ static int shape_status(struct udevice *dev, int *status)
return 0;
}
+static int set_light(struct udevice *dev, int light)
+{
+ struct shape_data *priv = dev_get_priv(dev);
+ struct gpio_desc *desc;
+ int ret;
+ int i;
+
+ desc = priv->gpio_desc;
+ for (i = 0; i < priv->gpio_count; i++, desc++) {
+ uint mask = 1 << i;
+
+ ret = dm_gpio_set_value(desc, light & mask);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int get_light(struct udevice *dev)
+{
+ struct shape_data *priv = dev_get_priv(dev);
+ struct gpio_desc *desc;
+ uint value = 0;
+ int ret;
+ int i;
+
+ desc = priv->gpio_desc;
+ for (i = 0; i < priv->gpio_count; i++, desc++) {
+ uint mask = 1 << i;
+
+ ret = dm_gpio_get_value(desc);
+ if (ret < 0)
+ return ret;
+ if (ret)
+ value |= mask;
+ }
+
+ return value;
+}
+
static const struct demo_ops shape_ops = {
.hello = shape_hello,
.status = shape_status,
+ .get_light = get_light,
+ .set_light = set_light,
};
static int shape_ofdata_to_platdata(struct udevice *dev)
@@ -111,6 +157,29 @@ static int shape_ofdata_to_platdata(struct udevice *dev)
return 0;
}
+static int dm_shape_probe(struct udevice *dev)
+{
+ struct shape_data *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = gpio_request_list_by_name(dev, "light-gpios", priv->gpio_desc,
+ ARRAY_SIZE(priv->gpio_desc),
+ GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+ if (ret < 0)
+ return ret;
+ priv->gpio_count = ret;
+ debug("%s: %d GPIOs\n", __func__, priv->gpio_count);
+
+ return 0;
+}
+
+static int dm_shape_remove(struct udevice *dev)
+{
+ struct shape_data *priv = dev_get_priv(dev);
+
+ return gpio_free_list(dev, priv->gpio_desc, priv->gpio_count);
+}
+
static const struct udevice_id demo_shape_id[] = {
{ "demo-shape", 0 },
{ },
@@ -122,6 +191,8 @@ U_BOOT_DRIVER(demo_shape_drv) = {
.id = UCLASS_DEMO,
.ofdata_to_platdata = shape_ofdata_to_platdata,
.ops = &shape_ops,
+ .probe = dm_shape_probe,
+ .remove = dm_shape_remove,
.priv_auto_alloc_size = sizeof(struct shape_data),
.platdata_auto_alloc_size = sizeof(struct dm_demo_pdata),
};
diff --git a/drivers/demo/demo-uclass.c b/drivers/demo/demo-uclass.c
index f6510d6..725f068 100644
--- a/drivers/demo/demo-uclass.c
+++ b/drivers/demo/demo-uclass.c
@@ -43,6 +43,26 @@ int demo_status(struct udevice *dev, int *status)
return ops->status(dev, status);
}
+int demo_get_light(struct udevice *dev)
+{
+ const struct demo_ops *ops = device_get_ops(dev);
+
+ if (!ops->get_light)
+ return -ENOSYS;
+
+ return ops->get_light(dev);
+}
+
+int demo_set_light(struct udevice *dev, int light)
+{
+ const struct demo_ops *ops = device_get_ops(dev);
+
+ if (!ops->set_light)
+ return -ENOSYS;
+
+ return ops->set_light(dev, light);
+}
+
int demo_parse_dt(struct udevice *dev)
{
struct dm_demo_pdata *pdata = dev_get_platdata(dev);