libsigrok/device.c

474 lines
11 KiB
C

/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2013 Bert Vermeulen <bert@biot.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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <glib.h>
#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
#include "libsigrok.h"
#include "libsigrok-internal.h"
/** @cond PRIVATE */
#define LOG_PREFIX "device"
/** @endcond */
/**
* @file
*
* Device handling in libsigrok.
*/
/**
* @defgroup grp_devices Devices
*
* Device handling in libsigrok.
*
* @{
*/
/** @private
* Allocate and initialize new struct sr_channel
* @param[in] index @copydoc sr_channel::index
* @param[in] type @copydoc sr_channel::type
* @param[in] enabled @copydoc sr_channel::enabled
* @param[in] name @copydoc sr_channel::name
*
* @return NULL (failure) or new struct sr_channel*.
*/
SR_PRIV struct sr_channel *sr_channel_new(int index, int type,
gboolean enabled, const char *name)
{
struct sr_channel *ch;
if (!(ch = g_try_malloc0(sizeof(struct sr_channel)))) {
sr_err("Channel malloc failed.");
return NULL;
}
ch->index = index;
ch->type = type;
ch->enabled = enabled;
if (name)
ch->name = g_strdup(name);
return ch;
}
/**
* Set the name of the specified channel in the specified device.
*
* If the channel already has a different name assigned to it, it will be
* removed, and the new name will be saved instead.
*
* @param sdi The device instance the channel is connected to.
* @param[in] channelnum The number of the channel whose name to set.
* Note that the channel numbers start at 0.
* @param[in] name The new name that the specified channel should get. A copy
* of the string is made.
*
* @return SR_OK on success, or SR_ERR_ARG on invalid arguments.
*
* @since 0.3.0
*/
SR_API int sr_dev_channel_name_set(const struct sr_dev_inst *sdi,
int channelnum, const char *name)
{
GSList *l;
struct sr_channel *ch;
int ret;
if (!sdi) {
sr_err("%s: sdi was NULL", __func__);
return SR_ERR_ARG;
}
ret = SR_ERR_ARG;
for (l = sdi->channels; l; l = l->next) {
ch = l->data;
if (ch->index == channelnum) {
g_free(ch->name);
ch->name = g_strdup(name);
ret = SR_OK;
break;
}
}
return ret;
}
/**
* Enable or disable a channel on the specified device.
*
* @param sdi The device instance the channel is connected to.
* @param channelnum The channel number, starting from 0.
* @param state TRUE to enable the channel, FALSE to disable.
*
* @return SR_OK on success or SR_ERR on failure. In case of invalid
* arguments, SR_ERR_ARG is returned and the channel enabled state
* remains unchanged.
*
* @since 0.3.0
*/
SR_API int sr_dev_channel_enable(const struct sr_dev_inst *sdi, int channelnum,
gboolean state)
{
GSList *l;
struct sr_channel *ch;
int ret;
gboolean was_enabled;
if (!sdi)
return SR_ERR_ARG;
ret = SR_ERR_ARG;
for (l = sdi->channels; l; l = l->next) {
ch = l->data;
if (ch->index == channelnum) {
was_enabled = ch->enabled;
ch->enabled = state;
ret = SR_OK;
if (!state != !was_enabled && sdi->driver
&& sdi->driver->config_channel_set) {
ret = sdi->driver->config_channel_set(
sdi, ch, SR_CHANNEL_SET_ENABLED);
/* Roll back change if it wasn't applicable. */
if (ret == SR_ERR_ARG)
ch->enabled = was_enabled;
}
break;
}
}
return ret;
}
/**
* Determine whether the specified device instance has the specified
* capability.
*
* @param sdi Pointer to the device instance to be checked. Must not be NULL.
* If the device's 'driver' field is NULL (virtual device), this
* function will always return FALSE (virtual devices don't have
* a hardware capabilities list).
* @param[in] key The option that should be checked for is supported by the
* specified device.
*
* @retval TRUE Device has the specified option
* @retval FALSE Device does not have the specified option, invalid input
* parameters or other error conditions.
*
* @since 0.2.0
*/
SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
{
GVariant *gvar;
const int *devopts;
gsize num_opts, i;
int ret;
if (!sdi || !sdi->driver || !sdi->driver->config_list)
return FALSE;
if (sdi->driver->config_list(SR_CONF_DEVICE_OPTIONS,
&gvar, sdi, NULL) != SR_OK)
return FALSE;
ret = FALSE;
devopts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(int32_t));
for (i = 0; i < num_opts; i++) {
if (devopts[i] == key) {
ret = TRUE;
break;
}
}
g_variant_unref(gvar);
return ret;
}
/** @private
* Allocate and init new device instance struct.
* @param[in] index @copydoc sr_dev_inst::index
* @param[in] status @copydoc sr_dev_inst::status
* @param[in] vendor @copydoc sr_dev_inst::vendor
* @param[in] model @copydoc sr_dev_inst::model
* @param[in] version @copydoc sr_dev_inst::version
*
* @retval NULL Error
* @retval struct sr_dev_inst *. Dynamically allocated, free using
* sr_dev_inst_free().
*/
SR_PRIV struct sr_dev_inst *sr_dev_inst_new(int index, int status,
const char *vendor, const char *model, const char *version)
{
struct sr_dev_inst *sdi;
if (!(sdi = g_try_malloc(sizeof(struct sr_dev_inst)))) {
sr_err("Device instance malloc failed.");
return NULL;
}
sdi->driver = NULL;
sdi->index = index;
sdi->status = status;
sdi->inst_type = -1;
sdi->vendor = vendor ? g_strdup(vendor) : NULL;
sdi->model = model ? g_strdup(model) : NULL;
sdi->version = version ? g_strdup(version) : NULL;
sdi->channels = NULL;
sdi->channel_groups = NULL;
sdi->conn = NULL;
sdi->priv = NULL;
return sdi;
}
/** @private
* Free device instance struct created by sr_dev_inst().
* @param sdi struct* to free.
*/
SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
{
struct sr_channel *ch;
GSList *l;
for (l = sdi->channels; l; l = l->next) {
ch = l->data;
g_free(ch->name);
g_free(ch);
}
g_slist_free(sdi->channels);
if (sdi->channel_groups)
g_slist_free(sdi->channel_groups);
g_free(sdi->vendor);
g_free(sdi->model);
g_free(sdi->version);
g_free(sdi);
}
#ifdef HAVE_LIBUSB_1_0
/** @private
* Allocate and init struct for USB device instance.
* @param[in] bus @copydoc sr_usb_dev_inst::bus
* @param[in] address @copydoc sr_usb_dev_inst::address
* @param[in] hdl @copydoc sr_usb_dev_inst::devhdl
*
* @retval NULL Error
* @retval other struct sr_usb_dev_inst * for USB device instance.
*/
SR_PRIV struct sr_usb_dev_inst *sr_usb_dev_inst_new(uint8_t bus,
uint8_t address, struct libusb_device_handle *hdl)
{
struct sr_usb_dev_inst *udi;
if (!(udi = g_try_malloc(sizeof(struct sr_usb_dev_inst)))) {
sr_err("USB device instance malloc failed.");
return NULL;
}
udi->bus = bus;
udi->address = address;
udi->devhdl = hdl;
return udi;
}
/** @private
* Free struct * allocated by sr_usb_dev_inst().
* @param usb struct* to free. Must not be NULL.
*/
SR_PRIV void sr_usb_dev_inst_free(struct sr_usb_dev_inst *usb)
{
g_free(usb);
}
#endif
#ifdef HAVE_LIBSERIALPORT
/**
* @private
*
* Both parameters are copied to newly allocated strings, and freed
* automatically by sr_serial_dev_inst_free().
*
* @param[in] port OS-specific serial port specification. Examples:
* "/dev/ttyUSB0", "/dev/ttyACM1", "/dev/tty.Modem-0", "COM1".
* @param[in] serialcomm A serial communication parameters string, in the form
* of \<speed\>/\<data bits\>\<parity\>\<stopbits\>, for example
* "9600/8n1" or "600/7o2". This is an optional parameter;
* it may be filled in later.
*
* @return A pointer to a newly initialized struct sr_serial_dev_inst,
* or NULL on error.
*/
SR_PRIV struct sr_serial_dev_inst *sr_serial_dev_inst_new(const char *port,
const char *serialcomm)
{
struct sr_serial_dev_inst *serial;
if (!port) {
sr_err("Serial port required.");
return NULL;
}
if (!(serial = g_try_malloc0(sizeof(struct sr_serial_dev_inst)))) {
sr_err("Serial device instance malloc failed.");
return NULL;
}
serial->port = g_strdup(port);
if (serialcomm)
serial->serialcomm = g_strdup(serialcomm);
return serial;
}
/** @private
* Free struct sr_serial_dev_inst * allocated by sr_serial_dev_inst().
* @param serial struct sr_serial_dev_inst * to free. Must not be NULL.
*/
SR_PRIV void sr_serial_dev_inst_free(struct sr_serial_dev_inst *serial)
{
g_free(serial->port);
g_free(serial->serialcomm);
g_free(serial);
}
#endif
/** @private */
SR_PRIV struct sr_usbtmc_dev_inst *sr_usbtmc_dev_inst_new(const char *device)
{
struct sr_usbtmc_dev_inst *usbtmc;
if (!device) {
sr_err("Device name required.");
return NULL;
}
if (!(usbtmc = g_try_malloc0(sizeof(struct sr_usbtmc_dev_inst)))) {
sr_err("USBTMC device instance malloc failed.");
return NULL;
}
usbtmc->device = g_strdup(device);
usbtmc->fd = -1;
return usbtmc;
}
/** @private */
SR_PRIV void sr_usbtmc_dev_inst_free(struct sr_usbtmc_dev_inst *usbtmc)
{
g_free(usbtmc->device);
g_free(usbtmc);
}
/**
* Get the list of devices/instances of the specified driver.
*
* @param driver The driver to use. Must not be NULL.
*
* @return The list of devices/instances of this driver, or NULL upon errors
* or if the list is empty.
*
* @since 0.2.0
*/
SR_API GSList *sr_dev_list(const struct sr_dev_driver *driver)
{
if (driver && driver->dev_list)
return driver->dev_list();
else
return NULL;
}
/**
* Clear the list of device instances a driver knows about.
*
* @param driver The driver to use. This must be a pointer to one of
* the entries returned by sr_driver_list(). Must not be NULL.
*
* @retval SR_OK Success
* @retval SR_ERR_ARG Invalid driver
*
* @since 0.2.0
*/
SR_API int sr_dev_clear(const struct sr_dev_driver *driver)
{
int ret;
if (!driver) {
sr_err("Invalid driver.");
return SR_ERR_ARG;
}
if (driver->dev_clear)
ret = driver->dev_clear();
else
ret = std_dev_clear(driver, NULL);
return ret;
}
/**
* Open the specified device.
*
* @param sdi Device instance to use. Must not be NULL.
*
* @return SR_OK upon success, a negative error code upon errors.
*
* @since 0.2.0
*/
SR_API int sr_dev_open(struct sr_dev_inst *sdi)
{
int ret;
if (!sdi || !sdi->driver || !sdi->driver->dev_open)
return SR_ERR;
ret = sdi->driver->dev_open(sdi);
return ret;
}
/**
* Close the specified device.
*
* @param sdi Device instance to use. Must not be NULL.
*
* @return SR_OK upon success, a negative error code upon errors.
*
* @since 0.2.0
*/
SR_API int sr_dev_close(struct sr_dev_inst *sdi)
{
int ret;
if (!sdi || !sdi->driver || !sdi->driver->dev_close)
return SR_ERR;
ret = sdi->driver->dev_close(sdi);
return ret;
}
/** @} */