Move build and debug tools to 'cctools' directory.

[fw/altos] / cctools / lib / cp-usb.c

diff --git a/cctools/lib/cp-usb.c b/cctools/lib/cp-usb.c
new file mode 100644 (file)
index 0000000..530848d
--- /dev/null
+++ b/cctools/lib/cp-usb.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+/*
+ * libusb interface to the GPIO pins on a CP2103.
+ *
+ * Various magic constants came from the cp210x driver published by silabs.
+ */
+
+#include "cp-usb.h"
+#include <stdio.h>
+#include <errno.h>
+#include <libusb.h>
+
+struct cp_usb {
+       usb_dev_handle *usb_dev;
+       uint8_t gpio;
+};
+
+#define CP2101_UART    0x00
+#define UART_ENABLE    0x0001
+#define UART_DISABLE   0x0000
+#define REQTYPE_HOST_TO_DEVICE  0x41
+#define REQTYPE_DEVICE_TO_HOST  0xc1
+
+static int
+cp_usb_gpio_get(struct cp_usb *cp, uint8_t *gpio_get)
+{
+       return usb_control_msg(cp->usb_dev,             /* dev */
+                              0xc0,                    /* request */
+                              0xff,                    /* requesttype */
+                              0x00c2,                  /* value */
+                              0,                       /* index */
+                              (char *) gpio_get,       /* bytes */
+                              1,                       /* size */
+                              300);                    /* timeout */
+}
+
+static int
+cp_usb_gpio_set(struct cp_usb *cp, uint8_t mask, uint8_t value)
+{
+       uint16_t gpio_set = ((uint16_t) value << 8) | mask;
+
+       return usb_control_msg(cp->usb_dev,             /* dev */
+                              0x40,                    /* request */
+                              0xff,                    /* requesttype */
+                              0x37e1,                  /* value */
+                              gpio_set,                /* index */
+                              NULL,                    /* bytes */
+                              0,                       /* size */
+                              300);                    /* timeout */
+}
+
+static int
+cp_usb_uart_enable_disable(struct cp_usb *cp, uint16_t enable)
+{
+       return usb_control_msg(cp->usb_dev,
+                              CP2101_UART,
+                              REQTYPE_HOST_TO_DEVICE,
+                              enable,
+                              0,
+                              NULL,
+                              0,
+                              300);
+}
+
+struct cp_usb *
+cp_usb_open(void)
+{
+       struct cp_usb *cp;
+       usb_dev_handle *dev_handle;
+       struct usb_device *dev = NULL;
+       struct usb_bus *bus, *busses;
+       int interface;
+       int ret;
+       uint8_t gpio;
+
+       usb_init();
+       usb_find_busses();
+       usb_find_devices();
+
+       busses = usb_get_busses();
+       for (bus = busses; bus; bus = bus->next) {
+               for (dev = bus->devices; dev; dev = dev->next) {
+                       if (dev->descriptor.idVendor == 0x10c4 &&
+                           dev->descriptor.idProduct == 0xea60)
+                               break;
+               }
+               if (dev)
+                       break;
+       }
+       if (!dev){
+               perror("No CP2103 found");
+               return NULL;
+       }
+       cp = calloc(sizeof(struct cp_usb), 1);
+       interface = 0;
+       dev_handle = usb_open(dev);
+       usb_detach_kernel_driver_np(dev_handle, interface);
+       usb_claim_interface(dev_handle, interface);
+       cp->usb_dev = dev_handle;
+       ret = cp_usb_uart_enable_disable(cp, UART_DISABLE);
+       cp->gpio = 0xf;
+       ret = cp_usb_gpio_set(cp, 0xf, cp->gpio);
+       ret = cp_usb_gpio_get(cp, &gpio);
+       return cp;
+}
+
+void
+cp_usb_close(struct cp_usb *cp)
+{
+       cp_usb_uart_enable_disable(cp, UART_DISABLE);
+       usb_close(cp->usb_dev);
+       free(cp);
+}
+
+void
+cp_usb_write(struct cp_usb *cp, uint8_t mask, uint8_t value)
+{
+       uint8_t new_gpio;
+       int ret;
+
+       new_gpio = (cp->gpio & ~mask) | (value & mask);
+       if (new_gpio != cp->gpio) {
+               ret = cp_usb_gpio_set(cp, new_gpio ^ cp->gpio, new_gpio);
+               if (ret < 0)
+                       perror("gpio_set");
+               cp->gpio = new_gpio;
+       }
+}
+
+uint8_t
+cp_usb_read(struct cp_usb *cp)
+{
+       int ret;
+       uint8_t gpio;
+
+       ret = cp_usb_gpio_get(cp, &gpio);
+       if (ret < 0)
+               perror("gpio_get");
+       return gpio;
+}