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From: Aleksander Morgado <aleksander@aleksander.es>
To: barebox@lists.infradead.org, s.hauer@pengutronix.de
Cc: Aleksander Morgado <aleksander@aleksander.es>
Subject: [PATCH 3/4] ratp: implement support for GPIO commands
Date: Tue, 21 Aug 2018 17:20:00 +0200	[thread overview]
Message-ID: <20180821152001.5747-4-aleksander@aleksander.es> (raw)
In-Reply-To: <20180821152001.5747-1-aleksander@aleksander.es>

Introduce three new RATP commands that allow getting and setting GPIO
values as well as configuring the direction of the GPIO pins.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
---
 common/ratp/Makefile |   1 +
 common/ratp/gpio.c   | 148 +++++++++++++++++++++++++++++++++++++++++++
 include/ratp_bb.h    |   6 ++
 3 files changed, 155 insertions(+)
 create mode 100644 common/ratp/gpio.c

diff --git a/common/ratp/Makefile b/common/ratp/Makefile
index 0234b55c1..3b5e495ab 100644
--- a/common/ratp/Makefile
+++ b/common/ratp/Makefile
@@ -5,3 +5,4 @@ obj-y += md.o
 obj-y += mw.o
 obj-y += reset.o
 obj-y += i2c.o
+obj-y += gpio.o
diff --git a/common/ratp/gpio.c b/common/ratp/gpio.c
new file mode 100644
index 000000000..d247cd614
--- /dev/null
+++ b/common/ratp/gpio.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2018 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <ratp_bb.h>
+#include <malloc.h>
+#include <environment.h>
+#include <gpio.h>
+#include <errno.h>
+
+struct ratp_bb_gpio_get_value_request {
+	struct ratp_bb header;
+	uint32_t       gpio;
+} __attribute__((packed));
+
+struct ratp_bb_gpio_get_value_response {
+	struct ratp_bb header;
+	uint8_t        value;
+} __attribute__((packed));
+
+static int ratp_cmd_gpio_get_value(const struct ratp_bb *req, int req_len,
+				   struct ratp_bb **rsp, int *rsp_len)
+{
+	struct ratp_bb_gpio_get_value_request *gpio_req = (struct ratp_bb_gpio_get_value_request *)req;
+	struct ratp_bb_gpio_get_value_response *gpio_rsp;
+	int gpio_rsp_len;
+	uint32_t gpio;
+	uint8_t value;
+
+	if (req_len < sizeof (*gpio_req)) {
+		printf ("ratp gpio get value request ignored: size mismatch (%d < %zu)\n", req_len, sizeof (*gpio_req));
+		return 2;
+	}
+
+	gpio = be32_to_cpu (gpio_req->gpio);
+	value = !!gpio_get_value(gpio);
+
+	gpio_rsp_len = sizeof(struct ratp_bb_gpio_get_value_response);
+	gpio_rsp = xzalloc(gpio_rsp_len);
+	gpio_rsp->header.type = cpu_to_be16(BB_RATP_TYPE_GPIO_GET_VALUE_RETURN);
+	gpio_rsp->value = value;
+
+	*rsp_len = gpio_rsp_len;
+	*rsp = (struct ratp_bb *)gpio_rsp;
+	return 0;
+}
+
+BAREBOX_RATP_CMD_START(GPIO_GET_VALUE)
+	.request_id = BB_RATP_TYPE_GPIO_GET_VALUE,
+	.response_id = BB_RATP_TYPE_GPIO_GET_VALUE_RETURN,
+	.cmd = ratp_cmd_gpio_get_value
+BAREBOX_RATP_CMD_END
+
+
+struct ratp_bb_gpio_set_value_request {
+	struct ratp_bb header;
+	uint32_t       gpio;
+	uint8_t        value;
+} __attribute__((packed));
+
+static int ratp_cmd_gpio_set_value(const struct ratp_bb *req, int req_len,
+				   struct ratp_bb **rsp, int *rsp_len)
+{
+	struct ratp_bb_gpio_set_value_request *gpio_req = (struct ratp_bb_gpio_set_value_request *)req;
+	uint32_t gpio;
+
+	if (req_len < sizeof (*gpio_req)) {
+		printf ("ratp gpio set value request ignored: size mismatch (%d < %zu)\n", req_len, sizeof (*gpio_req));
+		return 2;
+	}
+
+	gpio = be32_to_cpu (gpio_req->gpio);
+	gpio_set_value(gpio, gpio_req->value);
+
+	*rsp_len = sizeof(struct ratp_bb);
+	*rsp = xzalloc(*rsp_len);
+	(*rsp)->type = cpu_to_be16(BB_RATP_TYPE_GPIO_SET_VALUE_RETURN);
+	return 0;
+}
+
+BAREBOX_RATP_CMD_START(GPIO_SET_VALUE)
+	.request_id = BB_RATP_TYPE_GPIO_SET_VALUE,
+	.response_id = BB_RATP_TYPE_GPIO_SET_VALUE_RETURN,
+	.cmd = ratp_cmd_gpio_set_value
+BAREBOX_RATP_CMD_END
+
+
+struct ratp_bb_gpio_set_direction_request {
+	struct ratp_bb header;
+	uint32_t       gpio;
+	uint8_t        direction; /* 0: input, 1: output */
+	uint8_t        value;     /* applicable only if direction output */
+} __attribute__((packed));
+
+struct ratp_bb_gpio_set_direction_response {
+	struct ratp_bb header;
+	uint32_t       errno;
+} __attribute__((packed));
+
+static int ratp_cmd_gpio_set_direction(const struct ratp_bb *req, int req_len,
+				       struct ratp_bb **rsp, int *rsp_len)
+{
+	struct ratp_bb_gpio_set_direction_request *gpio_req = (struct ratp_bb_gpio_set_direction_request *)req;
+	struct ratp_bb_gpio_set_direction_response *gpio_rsp;
+	int gpio_rsp_len;
+	uint32_t gpio;
+	int ret;
+
+	if (req_len < sizeof (*gpio_req)) {
+		printf ("ratp gpio set direction request ignored: size mismatch (%d < %zu)\n", req_len, sizeof (*gpio_req));
+		return 2;
+	}
+
+	gpio = be32_to_cpu (gpio_req->gpio);
+	if (gpio_req->direction)
+		ret = gpio_direction_output(gpio, gpio_req->value);
+	else
+		ret = gpio_direction_input(gpio);
+
+	gpio_rsp_len = sizeof(struct ratp_bb_gpio_set_direction_response);
+	gpio_rsp = xzalloc(gpio_rsp_len);
+	gpio_rsp->header.type = cpu_to_be16(BB_RATP_TYPE_GPIO_SET_DIRECTION_RETURN);
+	gpio_rsp->errno = (ret == 0 ? 0 : EIO);
+
+	*rsp_len = gpio_rsp_len;
+	*rsp = (struct ratp_bb *)gpio_rsp;
+	return 0;
+}
+
+BAREBOX_RATP_CMD_START(GPIO_SET_DIRECTION)
+	.request_id = BB_RATP_TYPE_GPIO_SET_DIRECTION,
+	.response_id = BB_RATP_TYPE_GPIO_SET_DIRECTION_RETURN,
+	.cmd = ratp_cmd_gpio_set_direction
+BAREBOX_RATP_CMD_END
diff --git a/include/ratp_bb.h b/include/ratp_bb.h
index 32b8040b6..b6699979b 100644
--- a/include/ratp_bb.h
+++ b/include/ratp_bb.h
@@ -21,6 +21,12 @@
 #define BB_RATP_TYPE_I2C_READ_RETURN	16
 #define BB_RATP_TYPE_I2C_WRITE		17
 #define BB_RATP_TYPE_I2C_WRITE_RETURN	18
+#define BB_RATP_TYPE_GPIO_GET_VALUE		19
+#define BB_RATP_TYPE_GPIO_GET_VALUE_RETURN	20
+#define BB_RATP_TYPE_GPIO_SET_VALUE		21
+#define BB_RATP_TYPE_GPIO_SET_VALUE_RETURN	22
+#define BB_RATP_TYPE_GPIO_SET_DIRECTION		23
+#define BB_RATP_TYPE_GPIO_SET_DIRECTION_RETURN	24
 
 struct ratp_bb {
 	uint16_t type;
-- 
2.18.0


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  parent reply	other threads:[~2018-08-21 15:20 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-21 15:19 RATP i2c and GPIO support Aleksander Morgado
2018-08-21 15:19 ` [PATCH 1/4] ratp: implement i2c read/write support Aleksander Morgado
2018-08-21 19:38   ` Andrey Smirnov
2018-09-12  9:25     ` Aleksander Morgado
2018-08-22  7:46   ` Sascha Hauer
2018-08-23 20:54     ` Aleksander Morgado
2018-08-27  9:09       ` Sascha Hauer
2018-08-21 15:19 ` [PATCH 2/4] bbremote: " Aleksander Morgado
2018-08-21 15:20 ` Aleksander Morgado [this message]
2018-08-21 20:18   ` [PATCH 3/4] ratp: implement support for GPIO commands Andrey Smirnov
2018-08-22  7:52   ` Sascha Hauer
2018-08-21 15:20 ` [PATCH 4/4] bbremote: implement support for GPIO operations Aleksander Morgado

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