From e4240bf6962b7482e30976c138abb84f2eab4d85 Mon Sep 17 00:00:00 2001
From: smckown <smckown@986fd584-583e-0410-b54d-b9fe63dff8e5>
Date: Tue, 31 Mar 2009 17:20:49 +0000
Subject: [PATCH] Add the cpread utility

---
 src/examples/Makefile |   2 +-
 src/examples/cpread.c | 139 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+), 1 deletion(-)
 create mode 100644 src/examples/cpread.c

diff --git a/src/examples/Makefile b/src/examples/Makefile
index 85f2190..e42f823 100644
--- a/src/examples/Makefile
+++ b/src/examples/Makefile
@@ -1,6 +1,6 @@
 .PHONY: all
 
-PROGS = cpmfg cpio cptwiddle
+PROGS = cpmfg cpread cpio cptwiddle
 # LDFLAGS += -lusb
 
 all: $(PROGS)
diff --git a/src/examples/cpread.c b/src/examples/cpread.c
new file mode 100644
index 0000000..f5a5d8a
--- /dev/null
+++ b/src/examples/cpread.c
@@ -0,0 +1,139 @@
+/**
+ * cpcfg.c
+ *
+ * Read the configuration of a cp2103-equipped device.
+ */
+
+#include <netinet/in.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define VID	0x10c4
+#define PID	0xea60
+
+/* CP2103 ioctls */
+#define IOCTL_GPIOGET		0x8000	/* Get gpio bits */
+#define IOCTL_GPIOSET		0x8001	/* Set gpio bits */
+#define IOCTL_GPIOBIC		0x8002	/* Clear specific gpio bit(s) */
+#define IOCTL_GPIOBIS		0x8003	/* Set specific gpio bit(s) */
+
+/* CP210x ioctls principally used during initial device configuration */
+#define IOCTL_DEVICERESET	0x8004	/* Reset the cp210x */
+#define IOCTL_PORTCONFGET	0x8005	/* Get port configuration */
+#define IOCTL_PORTCONFSET	0x8006	/* Set port configuration */
+#define IOCTL_SETVID		0x8007	/* Set vendor id */
+#define IOCTL_SETPID		0x8008	/* Set product id */
+#define IOCTL_SETMFG		0x8009	/* Set manufacturer string */
+#define IOCTL_SETPRODUCT	0x800a	/* Set product string */
+#define IOCTL_SETSERIAL		0x800b	/* Set serial number string */
+#define IOCTL_SETDEVVER		0x800c	/* set device version id */
+/* FIXME: where is IOCTL_SETMFG? */
+
+/* CP2103 GPIO */
+#define GPIO_0		0x01
+#define GPIO_1		0x02
+#define GPIO_2		0x04
+#define GPIO_3		0x08
+#define GPIO_MASK	(GPIO_0|GPIO_1|GPIO_2|GPIO_3)
+
+/* Port config definitions */
+typedef struct {
+    uint16_t mode;		/* Push-pull = 1, Open-drain = 0 */
+    uint16_t lowPower;
+    uint16_t latch;		/* Logic high = 1, Logic low = 0 */
+} cp2101_port_state_t;
+
+typedef struct {
+    cp2101_port_state_t reset;
+    cp2101_port_state_t suspend;
+    uint8_t enhancedFxn;
+} cp2101_port_config_t;
+
+#define PORT_CONFIG_LEN	13	/* Because sizeof() will pad to full words */
+
+/* Used to pass variable sized buffers between user and kernel space (ioctls) */
+typedef struct {
+	char* buf;
+	size_t len;
+} cp210x_buffer_t;
+
+void exit(int);
+
+int cpConnect(char* device)
+{
+    int ret, ioval;
+    int fd = open(device, O_RDWR);
+    if (fd < 0) {
+	fprintf(stderr, "cannot open %s\n", device);
+	exit(1);
+    }
+    printf("%s opened\n", device);
+    return fd;
+}
+
+void cpDisconnect(int fd)
+{
+    if (fd >= 0)
+	close(fd);
+}
+
+void printState(cp2101_port_state_t* state)
+{
+    printf("m:0x%02x  lp:0x%02x  l:0x%02x", state->mode, state->lowPower,
+	    state->latch);
+}
+
+void printConfig(cp2101_port_config_t* config)
+{
+    printf("config: reset: "); printState(&config->reset);
+    printf("\nconfig: suspend: "); printState(&config->reset);
+    printf("\nenhancedFxn: 0x%02x\n", config->enhancedFxn);
+}
+
+void cpReset(int fd)
+{
+    int ret;
+
+    /* Reset the part */
+    if ((ret = ioctl(fd, IOCTL_DEVICERESET, 0))) {
+	fprintf(stderr, "device reset ioctl %d\n", ret);
+	exit(1);
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    cp2101_port_config_t config;
+    uint8_t gpio = 0xff;
+    int ret;
+    int fd;
+
+    if (argc != 2) {
+      fprintf(stderr, "usage: %s <tty>\n", argv[0]);
+      exit(1);
+    }
+
+    fd = cpConnect(argv[1]);
+
+    /* Read the current port configuration */
+    if ((ret = ioctl(fd, IOCTL_PORTCONFGET, &config))) {
+	fprintf(stderr, "portconfget ioctl failed %d\n", ret);
+	return 1;
+    }
+
+    /* Read the current gpio latches */
+    if ((ret = ioctl(fd, IOCTL_GPIOGET, &gpio))) {
+	fprintf(stderr, "gpioget ioctl failed %d\n", ret);
+	return 1;
+    }
+
+    printConfig(&config);
+    printf("gpio = 0x%0x\n", gpio);
+
+    cpDisconnect(fd);
+    return 0;
+}
-- 
2.39.2