]> sigrok.org Git - libsigrok.git/blobdiff - hardware/asix-sigma/asix-sigma.c
Rename SR_HWOPT_* and SR_HWCAP_* to SR_CONF_*
[libsigrok.git] / hardware / asix-sigma / asix-sigma.c
index f3a973647635ad181df7bf50c5c6685277d4fa93..828121ae121bb6614aaa813904e79ce15e462f06 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * This file is part of the sigrok project.
  *
- * Copyright (C) 2010 Håvard Espeland <gus@ping.uio.no>,
+ * Copyright (C) 2010-2012 Håvard Espeland <gus@ping.uio.no>,
  * Copyright (C) 2010 Martin Stensgård <mastensg@ping.uio.no>
  * Copyright (C) 2010 Carl Henrik Lunde <chlunde@ping.uio.no>
  *
  */
 
 /*
- * ASIX SIGMA Logic Analyzer Driver
+ * ASIX SIGMA/SIGMA2 logic analyzer driver
  */
 
 #include <glib.h>
 #include <glib/gstdio.h>
 #include <ftdi.h>
 #include <string.h>
-#include <zlib.h>
-#include "sigrok.h"
-#include "sigrok-internal.h"
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
 #include "asix-sigma.h"
 
 #define USB_VENDOR                     0xa600
 #define TRIGGER_TYPES                  "rf10"
 #define NUM_PROBES                     16
 
-static GSList *dev_insts = NULL;
+SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
+static struct sr_dev_driver *di = &asix_sigma_driver_info;
+static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
 
-static uint64_t supported_samplerates[] = {
+static const uint64_t supported_samplerates[] = {
        SR_KHZ(200),
        SR_KHZ(250),
        SR_KHZ(500),
@@ -63,39 +64,24 @@ static uint64_t supported_samplerates[] = {
  * (the cable has two additional GND pins, and a TI and TO pin)
  */
 static const char *probe_names[NUM_PROBES + 1] = {
-       "1",
-       "2",
-       "3",
-       "4",
-       "5",
-       "6",
-       "7",
-       "8",
-       "9",
-       "10",
-       "11",
-       "12",
-       "13",
-       "14",
-       "15",
-       "16",
+       "1", "2", "3", "4", "5", "6", "7", "8",
+       "9", "10", "11", "12", "13", "14", "15", "16",
        NULL,
 };
 
-static struct sr_samplerates samplerates = {
+static const struct sr_samplerates samplerates = {
        0,
        0,
        0,
        supported_samplerates,
 };
 
-static int hwcaps[] = {
-       SR_HWCAP_LOGIC_ANALYZER,
-       SR_HWCAP_SAMPLERATE,
-       SR_HWCAP_CAPTURE_RATIO,
-       SR_HWCAP_PROBECONFIG,
+static const int hwcaps[] = {
+       SR_CONF_LOGIC_ANALYZER,
+       SR_CONF_SAMPLERATE,
+       SR_CONF_CAPTURE_RATIO,
 
-       SR_HWCAP_LIMIT_MSEC,
+       SR_CONF_LIMIT_MSEC,
        0,
 };
 
@@ -123,38 +109,36 @@ static const char *firmware_files[] = {
        "asix-sigma-phasor.fw", /* Frequency counter */
 };
 
-static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
-
-static int sigma_read(void *buf, size_t size, struct context *ctx)
+static int sigma_read(void *buf, size_t size, struct dev_context *devc)
 {
        int ret;
 
-       ret = ftdi_read_data(&ctx->ftdic, (unsigned char *)buf, size);
+       ret = ftdi_read_data(&devc->ftdic, (unsigned char *)buf, size);
        if (ret < 0) {
-               sr_err("sigma: ftdi_read_data failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+               sr_err("ftdi_read_data failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
        }
 
        return ret;
 }
 
-static int sigma_write(void *buf, size_t size, struct context *ctx)
+static int sigma_write(void *buf, size_t size, struct dev_context *devc)
 {
        int ret;
 
-       ret = ftdi_write_data(&ctx->ftdic, (unsigned char *)buf, size);
+       ret = ftdi_write_data(&devc->ftdic, (unsigned char *)buf, size);
        if (ret < 0) {
-               sr_err("sigma: ftdi_write_data failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+               sr_err("ftdi_write_data failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
        } else if ((size_t) ret != size) {
-               sr_err("sigma: ftdi_write_data did not complete write.");
+               sr_err("ftdi_write_data did not complete write.");
        }
 
        return ret;
 }
 
 static int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
-                               struct context *ctx)
+                               struct dev_context *devc)
 {
        size_t i;
        uint8_t buf[len + 2];
@@ -168,16 +152,16 @@ static int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
                buf[idx++] = REG_DATA_HIGH_WRITE | (data[i] >> 4);
        }
 
-       return sigma_write(buf, idx, ctx);
+       return sigma_write(buf, idx, devc);
 }
 
-static int sigma_set_register(uint8_t reg, uint8_t value, struct context *ctx)
+static int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc)
 {
-       return sigma_write_register(reg, &value, 1, ctx);
+       return sigma_write_register(reg, &value, 1, devc);
 }
 
 static int sigma_read_register(uint8_t reg, uint8_t *data, size_t len,
-                              struct context *ctx)
+                              struct dev_context *devc)
 {
        uint8_t buf[3];
 
@@ -185,17 +169,17 @@ static int sigma_read_register(uint8_t reg, uint8_t *data, size_t len,
        buf[1] = REG_ADDR_HIGH | (reg >> 4);
        buf[2] = REG_READ_ADDR;
 
-       sigma_write(buf, sizeof(buf), ctx);
+       sigma_write(buf, sizeof(buf), devc);
 
-       return sigma_read(data, len, ctx);
+       return sigma_read(data, len, devc);
 }
 
-static uint8_t sigma_get_register(uint8_t reg, struct context *ctx)
+static uint8_t sigma_get_register(uint8_t reg, struct dev_context *devc)
 {
        uint8_t value;
 
-       if (1 != sigma_read_register(reg, &value, 1, ctx)) {
-               sr_err("sigma: sigma_get_register: 1 byte expected");
+       if (1 != sigma_read_register(reg, &value, 1, devc)) {
+               sr_err("sigma_get_register: 1 byte expected");
                return 0;
        }
 
@@ -203,7 +187,7 @@ static uint8_t sigma_get_register(uint8_t reg, struct context *ctx)
 }
 
 static int sigma_read_pos(uint32_t *stoppos, uint32_t *triggerpos,
-                         struct context *ctx)
+                         struct dev_context *devc)
 {
        uint8_t buf[] = {
                REG_ADDR_LOW | READ_TRIGGER_POS_LOW,
@@ -217,9 +201,9 @@ static int sigma_read_pos(uint32_t *stoppos, uint32_t *triggerpos,
        };
        uint8_t result[6];
 
-       sigma_write(buf, sizeof(buf), ctx);
+       sigma_write(buf, sizeof(buf), devc);
 
-       sigma_read(result, sizeof(result), ctx);
+       sigma_read(result, sizeof(result), devc);
 
        *triggerpos = result[0] | (result[1] << 8) | (result[2] << 16);
        *stoppos = result[3] | (result[4] << 8) | (result[5] << 16);
@@ -235,7 +219,7 @@ static int sigma_read_pos(uint32_t *stoppos, uint32_t *triggerpos,
 }
 
 static int sigma_read_dram(uint16_t startchunk, size_t numchunks,
-                          uint8_t *data, struct context *ctx)
+                          uint8_t *data, struct dev_context *devc)
 {
        size_t i;
        uint8_t buf[4096];
@@ -244,7 +228,7 @@ static int sigma_read_dram(uint16_t startchunk, size_t numchunks,
        /* Send the startchunk. Index start with 1. */
        buf[0] = startchunk >> 8;
        buf[1] = startchunk & 0xff;
-       sigma_write_register(WRITE_MEMROW, buf, 2, ctx);
+       sigma_write_register(WRITE_MEMROW, buf, 2, devc);
 
        /* Read the DRAM. */
        buf[idx++] = REG_DRAM_BLOCK;
@@ -261,13 +245,13 @@ static int sigma_read_dram(uint16_t startchunk, size_t numchunks,
                        buf[idx++] = REG_DRAM_WAIT_ACK;
        }
 
-       sigma_write(buf, idx, ctx);
+       sigma_write(buf, idx, devc);
 
-       return sigma_read(data, numchunks * CHUNK_SIZE, ctx);
+       return sigma_read(data, numchunks * CHUNK_SIZE, devc);
 }
 
 /* Upload trigger look-up tables to Sigma. */
-static int sigma_write_trigger_lut(struct triggerlut *lut, struct context *ctx)
+static int sigma_write_trigger_lut(struct triggerlut *lut, struct dev_context *devc)
 {
        int i;
        uint8_t tmp[2];
@@ -314,13 +298,13 @@ static int sigma_write_trigger_lut(struct triggerlut *lut, struct context *ctx)
                        tmp[1] |= 0x80;
 
                sigma_write_register(WRITE_TRIGGER_SELECT0, tmp, sizeof(tmp),
-                                    ctx);
-               sigma_set_register(WRITE_TRIGGER_SELECT1, 0x30 | i, ctx);
+                                    devc);
+               sigma_set_register(WRITE_TRIGGER_SELECT1, 0x30 | i, devc);
        }
 
        /* Send the parameters */
        sigma_write_register(WRITE_TRIGGER_SELECT0, (uint8_t *) &lut->params,
-                            sizeof(lut->params), ctx);
+                            sizeof(lut->params), devc);
 
        return SR_OK;
 }
@@ -330,24 +314,24 @@ static int bin2bitbang(const char *filename,
                       unsigned char **buf, size_t *buf_size)
 {
        FILE *f;
-       long file_size;
+       unsigned long file_size;
        unsigned long offset = 0;
        unsigned char *p;
-       uint8_t *compressed_buf, *firmware;
-       uLongf csize, fwsize;
+       uint8_t *firmware;
+       unsigned long fwsize = 0;
        const int buffer_size = 65536;
        size_t i;
-       int c, ret, bit, v;
+       int c, bit, v;
        uint32_t imm = 0x3f6df2ab;
 
        f = g_fopen(filename, "rb");
        if (!f) {
-               sr_err("sigma: g_fopen(\"%s\", \"rb\")", filename);
+               sr_err("g_fopen(\"%s\", \"rb\")", filename);
                return SR_ERR;
        }
 
        if (-1 == fseek(f, 0, SEEK_END)) {
-               sr_err("sigma: fseek on %s failed", filename);
+               sr_err("fseek on %s failed", filename);
                fclose(f);
                return SR_ERR;
        }
@@ -356,44 +340,30 @@ static int bin2bitbang(const char *filename,
 
        fseek(f, 0, SEEK_SET);
 
-       if (!(compressed_buf = g_try_malloc(file_size))) {
-               sr_err("sigma: %s: compressed_buf malloc failed", __func__);
-               fclose(f);
-               return SR_ERR_MALLOC;
-       }
-
        if (!(firmware = g_try_malloc(buffer_size))) {
-               sr_err("sigma: %s: firmware malloc failed", __func__);
+               sr_err("%s: firmware malloc failed", __func__);
                fclose(f);
-               g_free(compressed_buf);
                return SR_ERR_MALLOC;
        }
 
-       csize = 0;
        while ((c = getc(f)) != EOF) {
                imm = (imm + 0xa853753) % 177 + (imm * 0x8034052);
-               compressed_buf[csize++] = c ^ imm;
+               firmware[fwsize++] = c ^ imm;
        }
        fclose(f);
 
-       fwsize = buffer_size;
-       ret = uncompress(firmware, &fwsize, compressed_buf, csize);
-       if (ret < 0) {
-               g_free(compressed_buf);
-               g_free(firmware);
-               sr_err("sigma: Could not unpack Sigma firmware. "
-                      "(Error %d).", ret);
-               return SR_ERR;
+       if(fwsize != file_size) {
+           sr_err("%s: Error reading firmware", filename);
+           fclose(f);
+           g_free(firmware);
+           return SR_ERR;
        }
 
-       g_free(compressed_buf);
-
        *buf_size = fwsize * 2 * 8;
 
        *buf = p = (unsigned char *)g_try_malloc(*buf_size);
        if (!p) {
-               sr_err("sigma: %s: buf/p malloc failed", __func__);
-               g_free(compressed_buf);
+               sr_err("%s: buf/p malloc failed", __func__);
                g_free(firmware);
                return SR_ERR_MALLOC;
        }
@@ -410,7 +380,7 @@ static int bin2bitbang(const char *filename,
 
        if (offset != *buf_size) {
                g_free(*buf);
-               sr_err("sigma: Error reading firmware %s "
+               sr_err("Error reading firmware %s "
                       "offset=%ld, file_size=%ld, buf_size=%zd.",
                       filename, offset, file_size, *buf_size);
 
@@ -420,57 +390,144 @@ static int bin2bitbang(const char *filename,
        return SR_OK;
 }
 
-static int hw_init(const char *devinfo)
+static int clear_instances(void)
 {
+       GSList *l;
        struct sr_dev_inst *sdi;
-       struct context *ctx;
+       struct drv_context *drvc;
+       struct dev_context *devc;
+
+       drvc = di->priv;
+
+       /* Properly close all devices. */
+       for (l = drvc->instances; l; l = l->next) {
+               if (!(sdi = l->data)) {
+                       /* Log error, but continue cleaning up the rest. */
+                       sr_err("%s: sdi was NULL, continuing", __func__);
+                       continue;
+               }
+               if (sdi->priv) {
+                       devc = sdi->priv;
+                       ftdi_free(&devc->ftdic);
+               }
+               sr_dev_inst_free(sdi);
+       }
+       g_slist_free(drvc->instances);
+       drvc->instances = NULL;
+
+       return SR_OK;
+}
+
+static int hw_init(struct sr_context *sr_ctx)
+{
+       struct drv_context *drvc;
+
+       if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
+               sr_err("Driver context malloc failed.");
+               return SR_ERR_MALLOC;
+       }
+       drvc->sr_ctx = sr_ctx;
+       di->priv = drvc;
 
-       /* Avoid compiler warnings. */
-       (void)devinfo;
+       return SR_OK;
+}
 
-       if (!(ctx = g_try_malloc(sizeof(struct context)))) {
-               sr_err("sigma: %s: ctx malloc failed", __func__);
-               return 0; /* FIXME: Should be SR_ERR_MALLOC. */
+static GSList *hw_scan(GSList *options)
+{
+       struct sr_dev_inst *sdi;
+       struct sr_probe *probe;
+       struct drv_context *drvc;
+       struct dev_context *devc;
+       GSList *devices;
+       struct ftdi_device_list *devlist;
+       char serial_txt[10];
+       uint32_t serial;
+       int ret, i;
+
+       (void)options;
+
+       drvc = di->priv;
+       devices = NULL;
+       clear_instances();
+
+       if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
+               sr_err("%s: devc malloc failed", __func__);
+               return NULL;
        }
 
-       ftdi_init(&ctx->ftdic);
+       ftdi_init(&devc->ftdic);
 
        /* Look for SIGMAs. */
-       if (ftdi_usb_open_desc(&ctx->ftdic, USB_VENDOR, USB_PRODUCT,
-                              USB_DESCRIPTION, NULL) < 0)
+
+       if ((ret = ftdi_usb_find_all(&devc->ftdic, &devlist,
+           USB_VENDOR, USB_PRODUCT)) <= 0) {
+               if (ret < 0)
+                       sr_err("ftdi_usb_find_all(): %d", ret);
                goto free;
+       }
+
+       /* Make sure it's a version 1 or 2 SIGMA. */
+       ftdi_usb_get_strings(&devc->ftdic, devlist->dev, NULL, 0, NULL, 0,
+                            serial_txt, sizeof(serial_txt));
+       sscanf(serial_txt, "%x", &serial);
+
+       if (serial < 0xa6010000 || serial > 0xa602ffff) {
+               sr_err("Only SIGMA and SIGMA2 are supported "
+                      "in this version of libsigrok.");
+               goto free;
+       }
+
+       sr_info("Found ASIX SIGMA - Serial: %s", serial_txt);
 
-       ctx->cur_samplerate = 0;
-       ctx->period_ps = 0;
-       ctx->limit_msec = 0;
-       ctx->cur_firmware = -1;
-       ctx->num_probes = 0;
-       ctx->samples_per_event = 0;
-       ctx->capture_ratio = 50;
-       ctx->use_triggers = 0;
+       devc->cur_samplerate = 0;
+       devc->period_ps = 0;
+       devc->limit_msec = 0;
+       devc->cur_firmware = -1;
+       devc->num_probes = 0;
+       devc->samples_per_event = 0;
+       devc->capture_ratio = 50;
+       devc->use_triggers = 0;
 
        /* Register SIGMA device. */
        if (!(sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING, USB_VENDOR_NAME,
                                    USB_MODEL_NAME, USB_MODEL_VERSION))) {
-               sr_err("sigma: %s: sdi was NULL", __func__);
+               sr_err("%s: sdi was NULL", __func__);
                goto free;
        }
+       sdi->driver = di;
 
-       sdi->priv = ctx;
+       for (i = 0; probe_names[i]; i++) {
+               if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
+                               probe_names[i])))
+                       return NULL;
+               sdi->probes = g_slist_append(sdi->probes, probe);
+       }
 
-       dev_insts = g_slist_append(dev_insts, sdi);
+       devices = g_slist_append(devices, sdi);
+       drvc->instances = g_slist_append(drvc->instances, sdi);
+       sdi->priv = devc;
 
        /* We will open the device again when we need it. */
-       ftdi_usb_close(&ctx->ftdic);
+       ftdi_list_free(&devlist);
 
-       return 1;
+       return devices;
 
 free:
-       g_free(ctx);
-       return 0;
+       ftdi_deinit(&devc->ftdic);
+       g_free(devc);
+       return NULL;
+}
+
+static GSList *hw_dev_list(void)
+{
+       struct drv_context *drvc;
+
+       drvc = di->priv;
+
+       return drvc->instances;
 }
 
-static int upload_firmware(int firmware_idx, struct context *ctx)
+static int upload_firmware(int firmware_idx, struct dev_context *devc)
 {
        int ret;
        unsigned char *buf;
@@ -480,40 +537,40 @@ static int upload_firmware(int firmware_idx, struct context *ctx)
        char firmware_path[128];
 
        /* Make sure it's an ASIX SIGMA. */
-       if ((ret = ftdi_usb_open_desc(&ctx->ftdic,
+       if ((ret = ftdi_usb_open_desc(&devc->ftdic,
                USB_VENDOR, USB_PRODUCT, USB_DESCRIPTION, NULL)) < 0) {
-               sr_err("sigma: ftdi_usb_open failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+               sr_err("ftdi_usb_open failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
                return 0;
        }
 
-       if ((ret = ftdi_set_bitmode(&ctx->ftdic, 0xdf, BITMODE_BITBANG)) < 0) {
-               sr_err("sigma: ftdi_set_bitmode failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+       if ((ret = ftdi_set_bitmode(&devc->ftdic, 0xdf, BITMODE_BITBANG)) < 0) {
+               sr_err("ftdi_set_bitmode failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
                return 0;
        }
 
        /* Four times the speed of sigmalogan - Works well. */
-       if ((ret = ftdi_set_baudrate(&ctx->ftdic, 750000)) < 0) {
-               sr_err("sigma: ftdi_set_baudrate failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+       if ((ret = ftdi_set_baudrate(&devc->ftdic, 750000)) < 0) {
+               sr_err("ftdi_set_baudrate failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
                return 0;
        }
 
        /* Force the FPGA to reboot. */
-       sigma_write(suicide, sizeof(suicide), ctx);
-       sigma_write(suicide, sizeof(suicide), ctx);
-       sigma_write(suicide, sizeof(suicide), ctx);
-       sigma_write(suicide, sizeof(suicide), ctx);
+       sigma_write(suicide, sizeof(suicide), devc);
+       sigma_write(suicide, sizeof(suicide), devc);
+       sigma_write(suicide, sizeof(suicide), devc);
+       sigma_write(suicide, sizeof(suicide), devc);
 
        /* Prepare to upload firmware (FPGA specific). */
-       sigma_write(init, sizeof(init), ctx);
+       sigma_write(init, sizeof(init), devc);
 
-       ftdi_usb_purge_buffers(&ctx->ftdic);
+       ftdi_usb_purge_buffers(&devc->ftdic);
 
        /* Wait until the FPGA asserts INIT_B. */
        while (1) {
-               ret = sigma_read(result, 1, ctx);
+               ret = sigma_read(result, 1, devc);
                if (result[0] & 0x20)
                        break;
        }
@@ -523,61 +580,60 @@ static int upload_firmware(int firmware_idx, struct context *ctx)
                 firmware_files[firmware_idx]);
 
        if ((ret = bin2bitbang(firmware_path, &buf, &buf_size)) != SR_OK) {
-               sr_err("sigma: An error occured while reading the firmware: %s",
+               sr_err("An error occured while reading the firmware: %s",
                       firmware_path);
                return ret;
        }
 
        /* Upload firmare. */
-       sigma_write(buf, buf_size, ctx);
+       sr_info("Uploading firmware file '%s'.", firmware_files[firmware_idx]);
+       sigma_write(buf, buf_size, devc);
 
        g_free(buf);
 
-       if ((ret = ftdi_set_bitmode(&ctx->ftdic, 0x00, BITMODE_RESET)) < 0) {
-               sr_err("sigma: ftdi_set_bitmode failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+       if ((ret = ftdi_set_bitmode(&devc->ftdic, 0x00, BITMODE_RESET)) < 0) {
+               sr_err("ftdi_set_bitmode failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
                return SR_ERR;
        }
 
-       ftdi_usb_purge_buffers(&ctx->ftdic);
+       ftdi_usb_purge_buffers(&devc->ftdic);
 
        /* Discard garbage. */
-       while (1 == sigma_read(&pins, 1, ctx))
+       while (1 == sigma_read(&pins, 1, devc))
                ;
 
        /* Initialize the logic analyzer mode. */
-       sigma_write(logic_mode_start, sizeof(logic_mode_start), ctx);
+       sigma_write(logic_mode_start, sizeof(logic_mode_start), devc);
 
        /* Expect a 3 byte reply. */
-       ret = sigma_read(result, 3, ctx);
+       ret = sigma_read(result, 3, devc);
        if (ret != 3 ||
            result[0] != 0xa6 || result[1] != 0x55 || result[2] != 0xaa) {
-               sr_err("sigma: Configuration failed. Invalid reply received.");
+               sr_err("Configuration failed. Invalid reply received.");
                return SR_ERR;
        }
 
-       ctx->cur_firmware = firmware_idx;
+       devc->cur_firmware = firmware_idx;
+
+       sr_info("Firmware uploaded.");
 
        return SR_OK;
 }
 
-static int hw_dev_open(int dev_index)
+static int hw_dev_open(struct sr_dev_inst *sdi)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
+       struct dev_context *devc;
        int ret;
 
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
-               return SR_ERR;
-
-       ctx = sdi->priv;
+       devc = sdi->priv;
 
        /* Make sure it's an ASIX SIGMA. */
-       if ((ret = ftdi_usb_open_desc(&ctx->ftdic,
+       if ((ret = ftdi_usb_open_desc(&devc->ftdic,
                USB_VENDOR, USB_PRODUCT, USB_DESCRIPTION, NULL)) < 0) {
 
-               sr_err("sigma: ftdi_usb_open failed: %s",
-                      ftdi_get_error_string(&ctx->ftdic));
+               sr_err("ftdi_usb_open failed: %s",
+                      ftdi_get_error_string(&devc->ftdic));
 
                return 0;
        }
@@ -587,10 +643,12 @@ static int hw_dev_open(int dev_index)
        return SR_OK;
 }
 
-static int set_samplerate(struct sr_dev_inst *sdi, uint64_t samplerate)
+static int set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
 {
        int i, ret;
-       struct context *ctx = sdi->priv;
+       struct dev_context *devc = sdi->priv;
+
+       ret = SR_OK;
 
        for (i = 0; supported_samplerates[i]; i++) {
                if (supported_samplerates[i] == samplerate)
@@ -600,24 +658,22 @@ static int set_samplerate(struct sr_dev_inst *sdi, uint64_t samplerate)
                return SR_ERR_SAMPLERATE;
 
        if (samplerate <= SR_MHZ(50)) {
-               ret = upload_firmware(0, ctx);
-               ctx->num_probes = 16;
+               ret = upload_firmware(0, devc);
+               devc->num_probes = 16;
        }
        if (samplerate == SR_MHZ(100)) {
-               ret = upload_firmware(1, ctx);
-               ctx->num_probes = 8;
+               ret = upload_firmware(1, devc);
+               devc->num_probes = 8;
        }
        else if (samplerate == SR_MHZ(200)) {
-               ret = upload_firmware(2, ctx);
-               ctx->num_probes = 4;
+               ret = upload_firmware(2, devc);
+               devc->num_probes = 4;
        }
 
-       ctx->cur_samplerate = samplerate;
-       ctx->period_ps = 1000000000000 / samplerate;
-       ctx->samples_per_event = 16 / ctx->num_probes;
-       ctx->state.state = SIGMA_IDLE;
-
-       sr_info("sigma: Firmware uploaded");
+       devc->cur_samplerate = samplerate;
+       devc->period_ps = 1000000000000ULL / samplerate;
+       devc->samples_per_event = 16 / devc->num_probes;
+       devc->state.state = SIGMA_IDLE;
 
        return ret;
 }
@@ -630,38 +686,37 @@ static int set_samplerate(struct sr_dev_inst *sdi, uint64_t samplerate)
  * The Sigma supports complex triggers using boolean expressions, but this
  * has not been implemented yet.
  */
-static int configure_probes(struct sr_dev_inst *sdi, GSList *probes)
+static int configure_probes(const struct sr_dev_inst *sdi)
 {
-       struct context *ctx = sdi->priv;
-       struct sr_probe *probe;
-       GSList *l;
+       struct dev_context *devc = sdi->priv;
+       const struct sr_probe *probe;
+       const GSList *l;
        int trigger_set = 0;
        int probebit;
 
-       memset(&ctx->trigger, 0, sizeof(struct sigma_trigger));
+       memset(&devc->trigger, 0, sizeof(struct sigma_trigger));
 
-       for (l = probes; l; l = l->next) {
+       for (l = sdi->probes; l; l = l->next) {
                probe = (struct sr_probe *)l->data;
-               probebit = 1 << (probe->index - 1);
+               probebit = 1 << (probe->index);
 
                if (!probe->enabled || !probe->trigger)
                        continue;
 
-               if (ctx->cur_samplerate >= SR_MHZ(100)) {
+               if (devc->cur_samplerate >= SR_MHZ(100)) {
                        /* Fast trigger support. */
                        if (trigger_set) {
-                               sr_err("sigma: ASIX SIGMA only supports a single "
-                                      "pin trigger in 100 and 200MHz mode.");
+                               sr_err("Only a single pin trigger in 100 and "
+                                      "200MHz mode is supported.");
                                return SR_ERR;
                        }
                        if (probe->trigger[0] == 'f')
-                               ctx->trigger.fallingmask |= probebit;
+                               devc->trigger.fallingmask |= probebit;
                        else if (probe->trigger[0] == 'r')
-                               ctx->trigger.risingmask |= probebit;
+                               devc->trigger.risingmask |= probebit;
                        else {
-                               sr_err("sigma: ASIX SIGMA only supports "
-                                      "rising/falling trigger in 100 "
-                                      "and 200MHz mode.");
+                               sr_err("Only rising/falling trigger in 100 "
+                                      "and 200MHz mode is supported.");
                                return SR_ERR;
                        }
 
@@ -669,19 +724,19 @@ static int configure_probes(struct sr_dev_inst *sdi, GSList *probes)
                } else {
                        /* Simple trigger support (event). */
                        if (probe->trigger[0] == '1') {
-                               ctx->trigger.simplevalue |= probebit;
-                               ctx->trigger.simplemask |= probebit;
+                               devc->trigger.simplevalue |= probebit;
+                               devc->trigger.simplemask |= probebit;
                        }
                        else if (probe->trigger[0] == '0') {
-                               ctx->trigger.simplevalue &= ~probebit;
-                               ctx->trigger.simplemask |= probebit;
+                               devc->trigger.simplevalue &= ~probebit;
+                               devc->trigger.simplemask |= probebit;
                        }
                        else if (probe->trigger[0] == 'f') {
-                               ctx->trigger.fallingmask |= probebit;
+                               devc->trigger.fallingmask |= probebit;
                                ++trigger_set;
                        }
                        else if (probe->trigger[0] == 'r') {
-                               ctx->trigger.risingmask |= probebit;
+                               devc->trigger.risingmask |= probebit;
                                ++trigger_set;
                        }
 
@@ -691,37 +746,31 @@ static int configure_probes(struct sr_dev_inst *sdi, GSList *probes)
                         * does not permit ORed triggers.
                         */
                        if (trigger_set > 1) {
-                               sr_err("sigma: ASIX SIGMA only supports 1 "
-                                      "rising/falling triggers.");
+                               sr_err("Only 1 rising/falling trigger "
+                                      "is supported.");
                                return SR_ERR;
                        }
                }
 
                if (trigger_set)
-                       ctx->use_triggers = 1;
+                       devc->use_triggers = 1;
        }
 
        return SR_OK;
 }
 
-static int hw_dev_close(int dev_index)
+static int hw_dev_close(struct sr_dev_inst *sdi)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
+       struct dev_context *devc;
 
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
-               sr_err("sigma: %s: sdi was NULL", __func__);
-               return SR_ERR_BUG;
-       }
-
-       if (!(ctx = sdi->priv)) {
-               sr_err("sigma: %s: sdi->priv was NULL", __func__);
+       if (!(devc = sdi->priv)) {
+               sr_err("%s: sdi->priv was NULL", __func__);
                return SR_ERR_BUG;
        }
 
        /* TODO */
        if (sdi->status == SR_ST_ACTIVE)
-               ftdi_usb_close(&ctx->ftdic);
+               ftdi_usb_close(&devc->ftdic);
 
        sdi->status = SR_ST_INACTIVE;
 
@@ -730,103 +779,62 @@ static int hw_dev_close(int dev_index)
 
 static int hw_cleanup(void)
 {
-       GSList *l;
-       struct sr_dev_inst *sdi;
-       int ret = SR_OK;
+       if (!di->priv)
+               return SR_OK;
 
-       /* Properly close all devices. */
-       for (l = dev_insts; l; l = l->next) {
-               if (!(sdi = l->data)) {
-                       /* Log error, but continue cleaning up the rest. */
-                       sr_err("sigma: %s: sdi was NULL, continuing", __func__);
-                       ret = SR_ERR_BUG;
-                       continue;
-               }
-               sr_dev_inst_free(sdi);
-       }
-       g_slist_free(dev_insts);
-       dev_insts = NULL;
+       clear_instances();
 
-       return ret;
+       return SR_OK;
 }
 
-static void *hw_dev_info_get(int dev_index, int dev_info_id)
+static int hw_info_get(int info_id, const void **data,
+                      const struct sr_dev_inst *sdi)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
-       void *info = NULL;
-
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
-               sr_err("sigma: %s: sdi was NULL", __func__);
-               return NULL;
-       }
+       struct dev_context *devc;
 
-       ctx = sdi->priv;
-
-       switch (dev_info_id) {
-       case SR_DI_INST:
-               info = sdi;
-               break;
-       case SR_DI_NUM_PROBES:
-               info = GINT_TO_POINTER(NUM_PROBES);
-               break;
-       case SR_DI_PROBE_NAMES:
-               info = probe_names;
+       switch (info_id) {
+       case SR_DI_HWCAPS:
+               *data = hwcaps;
                break;
        case SR_DI_SAMPLERATES:
-               info = &samplerates;
+               *data = &samplerates;
                break;
        case SR_DI_TRIGGER_TYPES:
-               info = (char *)TRIGGER_TYPES;
+               *data = (char *)TRIGGER_TYPES;
                break;
        case SR_DI_CUR_SAMPLERATE:
-               info = &ctx->cur_samplerate;
+               if (sdi) {
+                       devc = sdi->priv;
+                       *data = &devc->cur_samplerate;
+               } else
+                       return SR_ERR;
                break;
+       default:
+               return SR_ERR_ARG;
        }
 
-       return info;
-}
-
-static int hw_dev_status_get(int dev_index)
-{
-       struct sr_dev_inst *sdi;
-
-       sdi = sr_dev_inst_get(dev_insts, dev_index);
-       if (sdi)
-               return sdi->status;
-       else
-               return SR_ST_NOT_FOUND;
-}
-
-static int *hw_hwcap_get_all(void)
-{
-       return hwcaps;
+       return SR_OK;
 }
 
-static int hw_dev_config_set(int dev_index, int hwcap, void *value)
+static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
+                            const void *value)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
+       struct dev_context *devc;
        int ret;
 
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
-               return SR_ERR;
-
-       ctx = sdi->priv;
+       devc = sdi->priv;
 
-       if (hwcap == SR_HWCAP_SAMPLERATE) {
-               ret = set_samplerate(sdi, *(uint64_t *)value);
-       } else if (hwcap == SR_HWCAP_PROBECONFIG) {
-               ret = configure_probes(sdi, value);
-       } else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
-               ctx->limit_msec = *(uint64_t *)value;
-               if (ctx->limit_msec > 0)
+       if (hwcap == SR_CONF_SAMPLERATE) {
+               ret = set_samplerate(sdi, *(const uint64_t *)value);
+       } else if (hwcap == SR_CONF_LIMIT_MSEC) {
+               devc->limit_msec = *(const uint64_t *)value;
+               if (devc->limit_msec > 0)
                        ret = SR_OK;
                else
                        ret = SR_ERR;
-       } else if (hwcap == SR_HWCAP_CAPTURE_RATIO) {
-               ctx->capture_ratio = *(uint64_t *)value;
-               if (ctx->capture_ratio < 0 || ctx->capture_ratio > 100)
+       } else if (hwcap == SR_CONF_CAPTURE_RATIO) {
+               devc->capture_ratio = *(const uint64_t *)value;
+               if (devc->capture_ratio < 0 || devc->capture_ratio > 100)
                        ret = SR_ERR;
                else
                        ret = SR_OK;
@@ -882,21 +890,21 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                           uint16_t limit_chunk, void *cb_data)
 {
        struct sr_dev_inst *sdi = cb_data;
-       struct context *ctx = sdi->priv;
+       struct dev_context *devc = sdi->priv;
        uint16_t tsdiff, ts;
-       uint16_t samples[65536 * ctx->samples_per_event];
+       uint16_t samples[65536 * devc->samples_per_event];
        struct sr_datafeed_packet packet;
        struct sr_datafeed_logic logic;
        int i, j, k, l, numpad, tosend;
        size_t n = 0, sent = 0;
-       int clustersize = EVENTS_PER_CLUSTER * ctx->samples_per_event;
+       int clustersize = EVENTS_PER_CLUSTER * devc->samples_per_event;
        uint16_t *event;
        uint16_t cur_sample;
        int triggerts = -1;
 
        /* Check if trigger is in this chunk. */
        if (triggerpos != -1) {
-               if (ctx->cur_samplerate <= SR_MHZ(50))
+               if (devc->cur_samplerate <= SR_MHZ(50))
                        triggerpos -= EVENTS_PER_CLUSTER - 1;
 
                if (triggerpos < 0)
@@ -917,7 +925,7 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                        return SR_OK;
 
                /* Pad last sample up to current point. */
-               numpad = tsdiff * ctx->samples_per_event - clustersize;
+               numpad = tsdiff * devc->samples_per_event - clustersize;
                if (numpad > 0) {
                        for (j = 0; j < numpad; ++j)
                                samples[j] = *lastsample;
@@ -935,7 +943,7 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                        logic.length = tosend * sizeof(uint16_t);
                        logic.unitsize = 2;
                        logic.data = samples + sent;
-                       sr_session_send(ctx->session_dev_id, &packet);
+                       sr_session_send(devc->session_dev_id, &packet);
 
                        sent += tosend;
                }
@@ -948,13 +956,13 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                for (j = 0; j < 7; ++j) {
 
                        /* For each sample in event. */
-                       for (k = 0; k < ctx->samples_per_event; ++k) {
+                       for (k = 0; k < devc->samples_per_event; ++k) {
                                cur_sample = 0;
 
                                /* For each probe. */
-                               for (l = 0; l < ctx->num_probes; ++l)
+                               for (l = 0; l < devc->num_probes; ++l)
                                        cur_sample |= (!!(event[j] & (1 << (l *
-                                          ctx->samples_per_event + k)))) << l;
+                                          devc->samples_per_event + k)))) << l;
 
                                samples[n++] = cur_sample;
                        }
@@ -970,7 +978,7 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                         * samples to pinpoint the exact position of the trigger.
                         */
                        tosend = get_trigger_offset(samples, *lastsample,
-                                                   &ctx->trigger);
+                                                   &devc->trigger);
 
                        if (tosend > 0) {
                                packet.type = SR_DF_LOGIC;
@@ -978,15 +986,15 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                                logic.length = tosend * sizeof(uint16_t);
                                logic.unitsize = 2;
                                logic.data = samples;
-                               sr_session_send(ctx->session_dev_id, &packet);
+                               sr_session_send(devc->session_dev_id, &packet);
 
                                sent += tosend;
                        }
 
                        /* Only send trigger if explicitly enabled. */
-                       if (ctx->use_triggers) {
+                       if (devc->use_triggers) {
                                packet.type = SR_DF_TRIGGER;
-                               sr_session_send(ctx->session_dev_id, &packet);
+                               sr_session_send(devc->session_dev_id, &packet);
                        }
                }
 
@@ -999,7 +1007,7 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
                        logic.length = tosend * sizeof(uint16_t);
                        logic.unitsize = 2;
                        logic.data = samples + sent;
-                       sr_session_send(ctx->session_dev_id, &packet);
+                       sr_session_send(devc->session_dev_id, &packet);
                }
 
                *lastsample = samples[n - 1];
@@ -1011,7 +1019,7 @@ static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
 static int receive_data(int fd, int revents, void *cb_data)
 {
        struct sr_dev_inst *sdi = cb_data;
-       struct context *ctx = sdi->priv;
+       struct dev_context *devc = sdi->priv;
        struct sr_datafeed_packet packet;
        const int chunks_per_read = 32;
        unsigned char buf[chunks_per_read * CHUNK_SIZE];
@@ -1019,56 +1027,56 @@ static int receive_data(int fd, int revents, void *cb_data)
        uint64_t running_msec;
        struct timeval tv;
 
-       /* Avoid compiler warnings. */
        (void)fd;
        (void)revents;
 
        /* Get the current position. */
-       sigma_read_pos(&ctx->state.stoppos, &ctx->state.triggerpos, ctx);
+       sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
 
-       numchunks = (ctx->state.stoppos + 511) / 512;
+       numchunks = (devc->state.stoppos + 511) / 512;
 
-       if (ctx->state.state == SIGMA_IDLE)
+       if (devc->state.state == SIGMA_IDLE)
                return TRUE;
 
-       if (ctx->state.state == SIGMA_CAPTURE) {
+       if (devc->state.state == SIGMA_CAPTURE) {
                /* Check if the timer has expired, or memory is full. */
                gettimeofday(&tv, 0);
-               running_msec = (tv.tv_sec - ctx->start_tv.tv_sec) * 1000 +
-                       (tv.tv_usec - ctx->start_tv.tv_usec) / 1000;
+               running_msec = (tv.tv_sec - devc->start_tv.tv_sec) * 1000 +
+                       (tv.tv_usec - devc->start_tv.tv_usec) / 1000;
 
-               if (running_msec < ctx->limit_msec && numchunks < 32767)
+               if (running_msec < devc->limit_msec && numchunks < 32767)
                        return TRUE; /* While capturing... */
-               else {
+               else
+                       hw_dev_acquisition_stop(sdi, sdi);
 
-               hw_dev_acquisition_stop(sdi->index, sdi);
+       }
 
-       } else if (ctx->state.state == SIGMA_DOWNLOAD) {
-               if (ctx->state.chunks_downloaded >= numchunks) {
+       if (devc->state.state == SIGMA_DOWNLOAD) {
+               if (devc->state.chunks_downloaded >= numchunks) {
                        /* End of samples. */
                        packet.type = SR_DF_END;
-                       sr_session_send(ctx->session_dev_id, &packet);
+                       sr_session_send(devc->session_dev_id, &packet);
 
-                       ctx->state.state = SIGMA_IDLE;
+                       devc->state.state = SIGMA_IDLE;
 
                        return TRUE;
                }
 
                newchunks = MIN(chunks_per_read,
-                               numchunks - ctx->state.chunks_downloaded);
+                               numchunks - devc->state.chunks_downloaded);
 
-               sr_info("sigma: Downloading sample data: %.0f %%",
-                       100.0 * ctx->state.chunks_downloaded / numchunks);
+               sr_info("Downloading sample data: %.0f %%.",
+                       100.0 * devc->state.chunks_downloaded / numchunks);
 
-               bufsz = sigma_read_dram(ctx->state.chunks_downloaded,
-                                       newchunks, buf, ctx);
+               bufsz = sigma_read_dram(devc->state.chunks_downloaded,
+                                       newchunks, buf, devc);
                /* TODO: Check bufsz. For now, just avoid compiler warnings. */
                (void)bufsz;
 
                /* Find first ts. */
-               if (ctx->state.chunks_downloaded == 0) {
-                       ctx->state.lastts = *(uint16_t *) buf - 1;
-                       ctx->state.lastsample = 0;
+               if (devc->state.chunks_downloaded == 0) {
+                       devc->state.lastts = *(uint16_t *) buf - 1;
+                       devc->state.lastsample = 0;
                }
 
                /* Decode chunks and send them to sigrok. */
@@ -1076,24 +1084,24 @@ static int receive_data(int fd, int revents, void *cb_data)
                        int limit_chunk = 0;
 
                        /* The last chunk may potentially be only in part. */
-                       if (ctx->state.chunks_downloaded == numchunks - 1) {
+                       if (devc->state.chunks_downloaded == numchunks - 1) {
                                /* Find the last valid timestamp */
-                               limit_chunk = ctx->state.stoppos % 512 + ctx->state.lastts;
+                               limit_chunk = devc->state.stoppos % 512 + devc->state.lastts;
                        }
 
-                       if (ctx->state.chunks_downloaded + i == ctx->state.triggerchunk)
+                       if (devc->state.chunks_downloaded + i == devc->state.triggerchunk)
                                decode_chunk_ts(buf + (i * CHUNK_SIZE),
-                                               &ctx->state.lastts,
-                                               &ctx->state.lastsample,
-                                               ctx->state.triggerpos & 0x1ff,
+                                               &devc->state.lastts,
+                                               &devc->state.lastsample,
+                                               devc->state.triggerpos & 0x1ff,
                                                limit_chunk, sdi);
                        else
                                decode_chunk_ts(buf + (i * CHUNK_SIZE),
-                                               &ctx->state.lastts,
-                                               &ctx->state.lastsample,
+                                               &devc->state.lastts,
+                                               &devc->state.lastsample,
                                                -1, limit_chunk, sdi);
 
-                       ++ctx->state.chunks_downloaded;
+                       ++devc->state.chunks_downloaded;
                }
        }
 
@@ -1211,7 +1219,7 @@ static void add_trigger_function(enum triggerop oper, enum triggerfunc func,
  * simple pin change and state triggers. Only two transitions (rise/fall) can be
  * set at any time, but a full mask and value can be set (0/1).
  */
-static int build_basic_trigger(struct triggerlut *lut, struct context *ctx)
+static int build_basic_trigger(struct triggerlut *lut, struct dev_context *devc)
 {
        int i,j;
        uint16_t masks[2] = { 0, 0 };
@@ -1222,13 +1230,13 @@ static int build_basic_trigger(struct triggerlut *lut, struct context *ctx)
        lut->m4 = 0xa000;
 
        /* Value/mask trigger support. */
-       build_lut_entry(ctx->trigger.simplevalue, ctx->trigger.simplemask,
+       build_lut_entry(devc->trigger.simplevalue, devc->trigger.simplemask,
                        lut->m2d);
 
        /* Rise/fall trigger support. */
        for (i = 0, j = 0; i < 16; ++i) {
-               if (ctx->trigger.risingmask & (1 << i) ||
-                   ctx->trigger.fallingmask & (1 << i))
+               if (devc->trigger.risingmask & (1 << i) ||
+                   devc->trigger.fallingmask & (1 << i))
                        masks[j++] = 1 << i;
        }
 
@@ -1238,13 +1246,13 @@ static int build_basic_trigger(struct triggerlut *lut, struct context *ctx)
        /* Add glue logic */
        if (masks[0] || masks[1]) {
                /* Transition trigger. */
-               if (masks[0] & ctx->trigger.risingmask)
+               if (masks[0] & devc->trigger.risingmask)
                        add_trigger_function(OP_RISE, FUNC_OR, 0, 0, &lut->m3);
-               if (masks[0] & ctx->trigger.fallingmask)
+               if (masks[0] & devc->trigger.fallingmask)
                        add_trigger_function(OP_FALL, FUNC_OR, 0, 0, &lut->m3);
-               if (masks[1] & ctx->trigger.risingmask)
+               if (masks[1] & devc->trigger.risingmask)
                        add_trigger_function(OP_RISE, FUNC_OR, 1, 0, &lut->m3);
-               if (masks[1] & ctx->trigger.fallingmask)
+               if (masks[1] & devc->trigger.fallingmask)
                        add_trigger_function(OP_FALL, FUNC_OR, 1, 0, &lut->m3);
        } else {
                /* Only value/mask trigger. */
@@ -1257,39 +1265,41 @@ static int build_basic_trigger(struct triggerlut *lut, struct context *ctx)
        return SR_OK;
 }
 
-static int hw_dev_acquisition_start(int dev_index, void *cb_data)
+static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
+               void *cb_data)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
-       struct sr_datafeed_packet packet;
-       struct sr_datafeed_header header;
+       struct dev_context *devc;
+       struct sr_datafeed_packet *packet;
+       struct sr_datafeed_header *header;
        struct clockselect_50 clockselect;
        int frac, triggerpin, ret;
-       uint8_t triggerselect;
+       uint8_t triggerselect = 0;
        struct triggerinout triggerinout_conf;
        struct triggerlut lut;
 
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index)))
-               return SR_ERR;
+       devc = sdi->priv;
 
-       ctx = sdi->priv;
+       if (configure_probes(sdi) != SR_OK) {
+               sr_err("Failed to configure probes.");
+               return SR_ERR;
+       }
 
        /* If the samplerate has not been set, default to 200 kHz. */
-       if (ctx->cur_firmware == -1) {
+       if (devc->cur_firmware == -1) {
                if ((ret = set_samplerate(sdi, SR_KHZ(200))) != SR_OK)
                        return ret;
        }
 
        /* Enter trigger programming mode. */
-       sigma_set_register(WRITE_TRIGGER_SELECT1, 0x20, ctx);
+       sigma_set_register(WRITE_TRIGGER_SELECT1, 0x20, devc);
 
        /* 100 and 200 MHz mode. */
-       if (ctx->cur_samplerate >= SR_MHZ(100)) {
-               sigma_set_register(WRITE_TRIGGER_SELECT1, 0x81, ctx);
+       if (devc->cur_samplerate >= SR_MHZ(100)) {
+               sigma_set_register(WRITE_TRIGGER_SELECT1, 0x81, devc);
 
                /* Find which pin to trigger on from mask. */
                for (triggerpin = 0; triggerpin < 8; ++triggerpin)
-                       if ((ctx->trigger.risingmask | ctx->trigger.fallingmask) &
+                       if ((devc->trigger.risingmask | devc->trigger.fallingmask) &
                            (1 << triggerpin))
                                break;
 
@@ -1297,14 +1307,14 @@ static int hw_dev_acquisition_start(int dev_index, void *cb_data)
                triggerselect = (1 << LEDSEL1) | (triggerpin & 0x7);
 
                /* Default rising edge. */
-               if (ctx->trigger.fallingmask)
+               if (devc->trigger.fallingmask)
                        triggerselect |= 1 << 3;
 
        /* All other modes. */
-       } else if (ctx->cur_samplerate <= SR_MHZ(50)) {
-               build_basic_trigger(&lut, ctx);
+       } else if (devc->cur_samplerate <= SR_MHZ(50)) {
+               build_basic_trigger(&lut, devc);
 
-               sigma_write_trigger_lut(&lut, ctx);
+               sigma_write_trigger_lut(&lut, devc);
 
                triggerselect = (1 << LEDSEL1) | (1 << LEDSEL0);
        }
@@ -1316,24 +1326,24 @@ static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 
        sigma_write_register(WRITE_TRIGGER_OPTION,
                             (uint8_t *) &triggerinout_conf,
-                            sizeof(struct triggerinout), ctx);
+                            sizeof(struct triggerinout), devc);
 
        /* Go back to normal mode. */
-       sigma_set_register(WRITE_TRIGGER_SELECT1, triggerselect, ctx);
+       sigma_set_register(WRITE_TRIGGER_SELECT1, triggerselect, devc);
 
        /* Set clock select register. */
-       if (ctx->cur_samplerate == SR_MHZ(200))
+       if (devc->cur_samplerate == SR_MHZ(200))
                /* Enable 4 probes. */
-               sigma_set_register(WRITE_CLOCK_SELECT, 0xf0, ctx);
-       else if (ctx->cur_samplerate == SR_MHZ(100))
+               sigma_set_register(WRITE_CLOCK_SELECT, 0xf0, devc);
+       else if (devc->cur_samplerate == SR_MHZ(100))
                /* Enable 8 probes. */
-               sigma_set_register(WRITE_CLOCK_SELECT, 0x00, ctx);
+               sigma_set_register(WRITE_CLOCK_SELECT, 0x00, devc);
        else {
                /*
                 * 50 MHz mode (or fraction thereof). Any fraction down to
                 * 50 MHz / 256 can be used, but is not supported by sigrok API.
                 */
-               frac = SR_MHZ(50) / ctx->cur_samplerate - 1;
+               frac = SR_MHZ(50) / devc->cur_samplerate - 1;
 
                clockselect.async = 0;
                clockselect.fraction = frac;
@@ -1341,90 +1351,98 @@ static int hw_dev_acquisition_start(int dev_index, void *cb_data)
 
                sigma_write_register(WRITE_CLOCK_SELECT,
                                     (uint8_t *) &clockselect,
-                                    sizeof(clockselect), ctx);
+                                    sizeof(clockselect), devc);
        }
 
        /* Setup maximum post trigger time. */
        sigma_set_register(WRITE_POST_TRIGGER,
-                       (ctx->capture_ratio * 255) / 100, ctx);
+                          (devc->capture_ratio * 255) / 100, devc);
 
        /* Start acqusition. */
-       gettimeofday(&ctx->start_tv, 0);
-       sigma_set_register(WRITE_MODE, 0x0d, ctx);
+       gettimeofday(&devc->start_tv, 0);
+       sigma_set_register(WRITE_MODE, 0x0d, devc);
 
-       ctx->session_dev_id = cb_data;
+       devc->session_dev_id = cb_data;
+
+       if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
+               sr_err("%s: packet malloc failed.", __func__);
+               return SR_ERR_MALLOC;
+       }
+
+       if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
+               sr_err("%s: header malloc failed.", __func__);
+               return SR_ERR_MALLOC;
+       }
 
        /* Send header packet to the session bus. */
-       packet.type = SR_DF_HEADER;
-       packet.payload = &header;
-       header.feed_version = 1;
-       gettimeofday(&header.starttime, NULL);
-       header.samplerate = ctx->cur_samplerate;
-       header.num_logic_probes = ctx->num_probes;
-       sr_session_send(ctx->session_dev_id, &packet);
+       packet->type = SR_DF_HEADER;
+       packet->payload = header;
+       header->feed_version = 1;
+       gettimeofday(&header->starttime, NULL);
+       sr_session_send(devc->session_dev_id, packet);
 
        /* Add capture source. */
-       sr_source_add(0, G_IO_IN, 10, receive_data, sdi);
+       sr_source_add(0, G_IO_IN, 10, receive_data, (void *)sdi);
+
+       g_free(header);
+       g_free(packet);
 
-       ctx->state.state = SIGMA_CAPTURE;
+       devc->state.state = SIGMA_CAPTURE;
 
        return SR_OK;
 }
 
-static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
+static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 {
-       struct sr_dev_inst *sdi;
-       struct context *ctx;
+       struct dev_context *devc;
        uint8_t modestatus;
 
-       /* Avoid compiler warnings. */
        (void)cb_data;
 
-       if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
-               sr_err("sigma: %s: sdi was NULL", __func__);
-               return SR_ERR_BUG;
-       }
+       sr_source_remove(0);
 
-       if (!(ctx = sdi->priv)) {
-               sr_err("sigma: %s: sdi->priv was NULL", __func__);
+       if (!(devc = sdi->priv)) {
+               sr_err("%s: sdi->priv was NULL", __func__);
                return SR_ERR_BUG;
        }
 
        /* Stop acquisition. */
-       sigma_set_register(WRITE_MODE, 0x11, ctx);
+       sigma_set_register(WRITE_MODE, 0x11, devc);
 
        /* Set SDRAM Read Enable. */
-       sigma_set_register(WRITE_MODE, 0x02, ctx);
+       sigma_set_register(WRITE_MODE, 0x02, devc);
 
        /* Get the current position. */
-       sigma_read_pos(&ctx->state.stoppos, &ctx->state.triggerpos, ctx);
+       sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
 
        /* Check if trigger has fired. */
-       modestatus = sigma_get_register(READ_MODE, ctx);
+       modestatus = sigma_get_register(READ_MODE, devc);
        if (modestatus & 0x20)
-               ctx->state.triggerchunk = ctx->state.triggerpos / 512;
+               devc->state.triggerchunk = devc->state.triggerpos / 512;
        else
-               ctx->state.triggerchunk = -1;
+               devc->state.triggerchunk = -1;
 
-       ctx->state.chunks_downloaded = 0;
+       devc->state.chunks_downloaded = 0;
 
-       ctx->state.state = SIGMA_DOWNLOAD;
+       devc->state.state = SIGMA_DOWNLOAD;
 
        return SR_OK;
 }
 
 SR_PRIV struct sr_dev_driver asix_sigma_driver_info = {
        .name = "asix-sigma",
-       .longname = "ASIX SIGMA",
+       .longname = "ASIX SIGMA/SIGMA2",
        .api_version = 1,
        .init = hw_init,
        .cleanup = hw_cleanup,
+       .scan = hw_scan,
+       .dev_list = hw_dev_list,
+       .dev_clear = clear_instances,
        .dev_open = hw_dev_open,
        .dev_close = hw_dev_close,
-       .dev_info_get = hw_dev_info_get,
-       .dev_status_get = hw_dev_status_get,
-       .hwcap_get_all = hw_hwcap_get_all,
+       .info_get = hw_info_get,
        .dev_config_set = hw_dev_config_set,
        .dev_acquisition_start = hw_dev_acquisition_start,
        .dev_acquisition_stop = hw_dev_acquisition_stop,
+       .priv = NULL,
 };