Hi Marek,
On Mon, 14 Dec 2020 at 04:25, Marek Szyprowski m.szyprowski@samsung.com wrote:
Add a simple ADC-based button driver. This driver binds to the 'adc-keys' device tree node.
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com Change-Id: I6da7101eff3ce53766d899f49f5839d728d52fb3
drivers/button/Kconfig | 8 +++ drivers/button/Makefile | 1 + drivers/button/button-adc.c | 117 ++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 drivers/button/button-adc.c
diff --git a/drivers/button/Kconfig b/drivers/button/Kconfig index 6b3ec7e55de..283367f2bd3 100644 --- a/drivers/button/Kconfig +++ b/drivers/button/Kconfig @@ -9,6 +9,14 @@ config BUTTON can provide access to board-specific buttons. Use of the device tree for configuration is encouraged.
+config BUTTON_ADC
bool "Button adc"depends on BUTTONhelpEnable support for buttons which are connected to ADC lines. The ADCdriver must use driver model. Buttons are configured using the devicetree.config BUTTON_GPIO bool "Button gpio" depends on BUTTON diff --git a/drivers/button/Makefile b/drivers/button/Makefile index fcc10ebe8db..bbd18af1494 100644 --- a/drivers/button/Makefile +++ b/drivers/button/Makefile @@ -3,4 +3,5 @@ # Copyright (C) 2020 Philippe Reynes philippe.reynes@softathome.com
obj-$(CONFIG_BUTTON) += button-uclass.o +obj-$(CONFIG_BUTTON_ADC) += button-adc.o obj-$(CONFIG_BUTTON_GPIO) += button-gpio.o diff --git a/drivers/button/button-adc.c b/drivers/button/button-adc.c new file mode 100644 index 00000000000..086c676c02a --- /dev/null +++ b/drivers/button/button-adc.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 +/*
- Copyright (C) 2020 Samsung Electronics Co., Ltd.
http://www.samsung.com
- Author: Marek Szyprowski m.szyprowski@samsung.com
- */
+#include <common.h> +#include <button.h> +#include <dm.h> +#include <dm/lists.h> +#include <dm/uclass-internal.h> +#include <log.h> +#include <adc.h>
Please check header order
https://www.denx.de/wiki/U-Boot/CodingStyle
+struct button_adc_priv {
struct udevice *adc;int channel;
comments
+};
+static enum button_state_t button_adc_get_state(struct udevice *dev) +{
struct button_adc_priv *priv = dev_get_priv(dev);unsigned int val, mask;int ret;ret = adc_start_channel(priv->adc, priv->channel);if (ret)return ret;ret = adc_channel_data(priv->adc, priv->channel, &val);if (ret)return ret;ret = adc_data_mask(priv->adc, &mask);if (ret)return ret;/* getting state is simplified a bit */if (ret == 0)return (val < mask / 2) ? BUTTON_ON : BUTTON_OFF;return ret;+}
+static int button_adc_probe(struct udevice *dev) +{
struct button_uc_plat *uc_plat = dev_get_uclass_platdata(dev);struct button_adc_priv *priv = dev_get_priv(dev);struct ofnode_phandle_args args;int ret;/* Ignore the top-level button node */if (!uc_plat->label)return 0;ret = dev_read_phandle_with_args(dev->parent, "io-channels","#io-channel-cells", 0, 0, &args);if (ret)return ret;ret = uclass_get_device_by_name(UCLASS_ADC, ofnode_get_name(args.node),&priv->adc);
How about uclass_get_device_by_ofnode() ?
if (ret)return ret;priv->channel = args.args[0];return ret;+}
+static int button_adc_bind(struct udevice *parent) +{
struct udevice *dev;ofnode node;int ret;dev_for_each_subnode(node, parent) {struct button_uc_plat *uc_plat;const char *label;label = ofnode_read_string(node, "label");if (!label) {debug("%s: node %s has no label\n", __func__,ofnode_get_name(node));return -EINVAL;}ret = device_bind_driver_to_node(parent, "button_adc",ofnode_get_name(node),node, &dev);if (ret)return ret;uc_plat = dev_get_uclass_platdata(dev);uc_plat->label = label;}return 0;+}
+static const struct button_ops button_adc_ops = {
.get_state = button_adc_get_state,+};
+static const struct udevice_id button_adc_ids[] = {
{ .compatible = "adc-keys" },
Please add the binding file for this.
{ }+};
+U_BOOT_DRIVER(button_adc) = {
.name = "button_adc",.id = UCLASS_BUTTON,.of_match = button_adc_ids,.ops = &button_adc_ops,.priv_auto_alloc_size = sizeof(struct button_adc_priv),.bind = button_adc_bind,.probe = button_adc_probe,+};
2.17.1
Regards, Simon