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@xxxxxxxxxxxxx>
---
common/ratp/Kconfig | 10 ++-
common/ratp/Makefile | 1 +
common/ratp/gpio.c | 144 +++++++++++++++++++++++++++++++++++++++++++
include/ratp_bb.h | 6 ++
4 files changed, 160 insertions(+), 1 deletion(-)
create mode 100644 common/ratp/gpio.c
diff --git a/common/ratp/Kconfig b/common/ratp/Kconfig
index 4b28d5f9f..ddbbd955c 100644
--- a/common/ratp/Kconfig
+++ b/common/ratp/Kconfig
@@ -18,4 +18,12 @@ config RATP_CMD_I2C
depends on I2C
prompt "RATP i2c support"
help
- This option adds support for i2c read/write commands via RATP.
\ No newline at end of file
+ This option adds support for i2c read/write commands via RATP.
+
+config RATP_CMD_GPIO
+ bool
+ depends on RATP
+ depends on GENERIC_GPIO
+ prompt "RATP GPIO support"
+ help
+ This option adds support for GPIO get/set/direction commands via RATP.
\ No newline at end of file
diff --git a/common/ratp/Makefile b/common/ratp/Makefile
index b83c48327..71288bcb8 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-$(CONFIG_RATP_CMD_I2C) += i2c.o
+obj-$(CONFIG_RATP_CMD_GPIO) += gpio.o
diff --git a/common/ratp/gpio.c b/common/ratp/gpio.c
new file mode 100644
index 000000000..d2c527a40
--- /dev/null
+++ b/common/ratp/gpio.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2018 Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>, Pengutronix
+ * Copyright (c) 2018 Zodiac Inflight Innovations
+ *
+ * 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.
+ *
+ */
+
+#define pr_fmt(fmt) "barebox-ratp: gpio: " fmt
+
+#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;
+} __packed;
+
+struct ratp_bb_gpio_get_value_response {
+ struct ratp_bb header;
+ uint8_t value;
+} __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;
+
+ if (req_len < sizeof(*gpio_req)) {
+ pr_err("get value request ignored: size mismatch (%d < %zu)\n", req_len, sizeof(*gpio_req));
+ return 2;
+ }
+
+ 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 = !!gpio_get_value(be32_to_cpu(gpio_req->gpio));
+
+ *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;
+} __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;
+
+ if (req_len < sizeof(*gpio_req)) {
+ pr_err("set value request ignored: size mismatch (%d < %zu)\n", req_len, sizeof(*gpio_req));
+ return 2;
+ }
+
+ gpio_set_value(be32_to_cpu(gpio_req->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 */
+} __packed;
+
+struct ratp_bb_gpio_set_direction_response {
+ struct ratp_bb header;
+ uint32_t errno;
+} __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)) {
+ pr_err("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;
--
2.19.0
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