X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fbaylibre-acme%2Fprotocol.c;h=dfd634bb380ee60a121b9b6f5205a5068b7f1fb4;hb=4e88b86cc81ce6569c4bbf947fc2f0f47f4ce8a1;hp=b9f80965dfa8de69dcc96f94ccb82adf54405102;hpb=dfaee1de1711cdfba7bd780b448188819691a2db;p=libsigrok.git
diff --git a/src/hardware/baylibre-acme/protocol.c b/src/hardware/baylibre-acme/protocol.c
index b9f80965..dfd634bb 100644
--- a/src/hardware/baylibre-acme/protocol.c
+++ b/src/hardware/baylibre-acme/protocol.c
@@ -17,24 +17,631 @@
* along with this program. If not, see .
*/
+#include
+#include
+#include
+#include
+#include
#include "protocol.h"
+#include "gpio.h"
-SR_PRIV int baylibre_acme_receive_data(int fd, int revents, void *cb_data)
+struct channel_group_priv {
+ int hwmon_num;
+ int probe_type;
+ int index;
+};
+
+struct channel_priv {
+ int ch_type;
+ int fd;
+ struct channel_group_priv *probe;
+};
+
+static const uint8_t enrg_i2c_addrs[] = {
+ 0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
+};
+
+static const uint8_t temp_i2c_addrs[] = {
+ 0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
+};
+
+static const uint32_t pws_gpios[] = {
+ 486, 498, 502, 482, 478, 506, 510, 474,
+};
+
+static const uint32_t pws_info_gpios[] = {
+ 487, 499, 503, 483, 479, 507, 511, 475,
+};
+
+#define MOHM_TO_UOHM(x) ((x) * 1000)
+#define UOHM_TO_MOHM(x) ((x) / 1000)
+
+SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
+{
+ return enrg_i2c_addrs[index];
+}
+
+SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
+{
+ return temp_i2c_addrs[index];
+}
+
+SR_PRIV gboolean bl_acme_is_sane(void)
+{
+ gboolean status;
+
+ /*
+ * We expect sysfs to be present and mounted at /sys, ina226 and
+ * tmp435 sensors detected by the system and their appropriate
+ * drivers loaded and functional.
+ */
+ status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
+ if (!status) {
+ sr_err("/sys/ directory not found - sysfs not mounted?");
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static void probe_name_path(unsigned int addr, GString *path)
+{
+ g_string_printf(path,
+ "/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
+}
+
+/*
+ * For given address fill buf with the path to appropriate hwmon entry.
+ */
+static void probe_hwmon_path(unsigned int addr, GString *path)
+{
+ g_string_printf(path,
+ "/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
+}
+
+SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
+ int prb_num, const char *prb_name)
+{
+ gboolean ret = FALSE, status;
+ char *buf = NULL;
+ GString *path = g_string_sized_new(64);
+ GError *err = NULL;
+ gsize size;
+
+ probe_name_path(addr, path);
+ status = g_file_get_contents(path->str, &buf, &size, &err);
+ if (!status) {
+ sr_dbg("Name for probe %d can't be read: %s",
+ prb_num, err->message);
+ g_string_free(path, TRUE);
+ return ret;
+ }
+
+ if (!strncmp(buf, prb_name, strlen(prb_name))) {
+ /*
+ * Correct driver registered on this address - but is
+ * there an actual probe connected?
+ */
+ probe_hwmon_path(addr, path);
+ status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
+ if (status) {
+ /* We have found an ACME probe. */
+ ret = TRUE;
+ }
+ }
+
+ g_free(buf);
+ g_string_free(path, TRUE);
+
+ return ret;
+}
+
+static int get_hwmon_index(unsigned int addr)
+{
+ int status, hwmon;
+ GString *path = g_string_sized_new(64);
+ GError *err = NULL;
+ GDir *dir;
+
+ probe_hwmon_path(addr, path);
+ dir = g_dir_open(path->str, 0, &err);
+ if (!dir) {
+ sr_err("Error opening %s: %s", path->str, err->message);
+ g_string_free(path, TRUE);
+ return -1;
+ }
+
+ g_string_free(path, TRUE);
+
+ /*
+ * The directory should contain a single file named hwmonX where X
+ * is the hwmon index.
+ */
+ status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
+ g_dir_close(dir);
+ if (status != 1) {
+ sr_err("Unable to determine the hwmon entry");
+ return -1;
+ }
+
+ return hwmon;
+}
+
+static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
+ int index, int type)
+{
+ struct channel_priv *cp;
+ struct dev_context *devc;
+ struct sr_channel *ch;
+ char *name;
+
+ devc = sdi->priv;
+
+ switch (type) {
+ case ENRG_PWR:
+ name = g_strdup_printf("P%d_ENRG_PWR", index);
+ break;
+ case ENRG_CURR:
+ name = g_strdup_printf("P%d_ENRG_CURR", index);
+ break;
+ case ENRG_VOL:
+ name = g_strdup_printf("P%d_ENRG_VOL", index);
+ break;
+ case TEMP_IN:
+ name = g_strdup_printf("P%d_TEMP_IN", index);
+ break;
+ case TEMP_OUT:
+ name = g_strdup_printf("P%d_TEMP_OUT", index);
+ break;
+ default:
+ sr_err("Invalid channel type: %d.", type);
+ return;
+ }
+
+ cp = g_malloc0(sizeof(struct channel_priv));
+ cp->ch_type = type;
+ cp->probe = cg->priv;
+
+ ch = sr_channel_new(sdi, devc->num_channels++,
+ SR_CHANNEL_ANALOG, TRUE, name);
+ g_free(name);
+
+ ch->priv = cp;
+ cg->channels = g_slist_append(cg->channels, ch);
+}
+
+SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
+ unsigned int addr, int prb_num)
+{
+ struct sr_channel_group *cg;
+ struct channel_group_priv *cgp;
+ int hwmon;
+
+ /* Obtain the hwmon index. */
+ hwmon = get_hwmon_index(addr);
+ if (hwmon < 0)
+ return FALSE;
+
+ cg = g_malloc0(sizeof(struct sr_channel_group));
+ cgp = g_malloc0(sizeof(struct channel_group_priv));
+ cgp->hwmon_num = hwmon;
+ cgp->probe_type = type;
+ cgp->index = prb_num - 1;
+ cg->name = g_strdup_printf("Probe_%d", prb_num);
+ cg->priv = cgp;
+
+ if (type == PROBE_ENRG) {
+ append_channel(sdi, cg, prb_num, ENRG_PWR);
+ append_channel(sdi, cg, prb_num, ENRG_CURR);
+ append_channel(sdi, cg, prb_num, ENRG_VOL);
+ } else if (type == PROBE_TEMP) {
+ append_channel(sdi, cg, prb_num, TEMP_IN);
+ append_channel(sdi, cg, prb_num, TEMP_OUT);
+ } else {
+ sr_err("Invalid probe type: %d.", type);
+ }
+
+ sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
+
+ return TRUE;
+}
+
+SR_PRIV int bl_acme_get_probe_type(const struct sr_channel_group *cg)
+{
+ struct channel_group_priv *cgp = cg->priv;
+
+ return cgp->probe_type;
+}
+
+SR_PRIV int bl_acme_probe_has_pws(const struct sr_channel_group *cg)
+{
+ struct channel_group_priv *cgp = cg->priv;
+
+ return sr_gpio_getval_export(pws_info_gpios[cgp->index]);
+}
+
+/*
+ * Sets path to the hwmon attribute if this channel group
+ * supports shunt resistance setting. The caller has to supply
+ * a valid GString.
+ */
+static int get_shunt_path(const struct sr_channel_group *cg, GString *path)
+{
+ struct channel_group_priv *cgp;
+ int ret = SR_OK, status;
+
+ cgp = cg->priv;
+
+ if (cgp->probe_type != PROBE_ENRG) {
+ sr_err("Probe doesn't support shunt resistance setting");
+ return SR_ERR_ARG;
+ }
+
+ g_string_append_printf(path,
+ "/sys/class/hwmon/hwmon%d/shunt_resistor",
+ cgp->hwmon_num);
+
+ /*
+ * The shunt_resistor sysfs attribute is available
+ * in the Linux kernel since version 3.20. We have
+ * to notify the user if this attribute is not present.
+ */
+ status = g_file_test(path->str, G_FILE_TEST_EXISTS);
+ if (!status) {
+ sr_err("shunt_resistance attribute not present, please update "
+ "your kernel to version >=3.20");
+ return SR_ERR_NA;
+ }
+
+ return ret;
+}
+
+/*
+ * Try setting the update_interval sysfs attribute for each probe according
+ * to samplerate.
+ */
+SR_PRIV void bl_acme_maybe_set_update_interval(const struct sr_dev_inst *sdi,
+ uint64_t samplerate)
+{
+ struct sr_channel_group *cg;
+ struct channel_group_priv *cgp;
+ GString *hwmon;
+ GSList *l;
+ FILE *fd;
+
+ for (l = sdi->channel_groups; l != NULL; l = l->next) {
+ cg = l->data;
+ cgp = cg->priv;
+
+ hwmon = g_string_sized_new(64);
+ g_string_append_printf(hwmon,
+ "/sys/class/hwmon/hwmon%d/update_interval",
+ cgp->hwmon_num);
+
+ if (g_file_test(hwmon->str, G_FILE_TEST_EXISTS)) {
+ fd = g_fopen(hwmon->str, "w");
+ if (!fd) {
+ g_string_free(hwmon, TRUE);
+ continue;
+ }
+
+ g_fprintf(fd, "%" PRIu64 "\n", 1000 / samplerate);
+ fclose(fd);
+ }
+
+ g_string_free(hwmon, TRUE);
+ }
+}
+
+SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
+ uint64_t *shunt)
+{
+ GString *path = g_string_sized_new(64);
+ gchar *contents;
+ int status, ret = SR_OK;
+ GError *err = NULL;
+
+ status = get_shunt_path(cg, path);
+ if (status != SR_OK) {
+ ret = status;
+ goto out;
+ }
+
+ status = g_file_get_contents(path->str, &contents, NULL, &err);
+ if (!status) {
+ sr_err("Error reading shunt resistance: %s", err->message);
+ ret = SR_ERR_IO;
+ goto out;
+ }
+
+ *shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
+
+out:
+ g_string_free(path, TRUE);
+ return ret;
+}
+
+SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
+{
+ GString *path = g_string_sized_new(64);;
+ int status, ret = SR_OK;
+ FILE *fd;
+
+ status = get_shunt_path(cg, path);
+ if (status != SR_OK) {
+ ret = status;
+ goto out;
+ }
+
+ /*
+ * Can't use g_file_set_contents() here, as it calls open() with
+ * O_EXEC flag in a sysfs directory thus failing with EACCES.
+ */
+ fd = g_fopen(path->str, "w");
+ if (!fd) {
+ sr_err("Error opening %s: %s", path->str, strerror(errno));
+ ret = SR_ERR_IO;
+ goto out;
+ }
+
+ g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
+ fclose(fd);
+
+out:
+ g_string_free(path, TRUE);
+ return ret;
+}
+
+SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
+ gboolean *off)
+{
+ struct channel_group_priv *cgp;
+ int val;
+
+ cgp = cg->priv;
+
+ if (!bl_acme_probe_has_pws(cg)) {
+ sr_err("Probe has no power-switch");
+ return SR_ERR_ARG;
+ }
+
+ val = sr_gpio_getval_export(pws_gpios[cgp->index]);
+ *off = val ? FALSE : TRUE;
+
+ return SR_OK;
+}
+
+SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
+ gboolean off)
{
- const struct sr_dev_inst *sdi;
+ struct channel_group_priv *cgp;
+ int val;
+
+ cgp = cg->priv;
+
+ if (!bl_acme_probe_has_pws(cg)) {
+ sr_err("Probe has no power-switch");
+ return SR_ERR_ARG;
+ }
+
+ val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
+ if (val < 0) {
+ sr_err("Error setting power-off state: gpio: %d",
+ pws_gpios[cgp->index]);
+ return SR_ERR_IO;
+ }
+
+ return SR_OK;
+}
+
+static int channel_to_mq(struct sr_channel *ch)
+{
+ struct channel_priv *chp;
+
+ chp = ch->priv;
+
+ switch (chp->ch_type) {
+ case ENRG_PWR:
+ return SR_MQ_POWER;
+ case ENRG_CURR:
+ return SR_MQ_CURRENT;
+ case ENRG_VOL:
+ return SR_MQ_VOLTAGE;
+ case TEMP_IN: /* Fallthrough */
+ case TEMP_OUT:
+ return SR_MQ_TEMPERATURE;
+ default:
+ return -1;
+ }
+}
+
+static int channel_to_unit(struct sr_channel *ch)
+{
+ struct channel_priv *chp;
+
+ chp = ch->priv;
+
+ switch (chp->ch_type) {
+ case ENRG_PWR:
+ return SR_UNIT_WATT;
+ case ENRG_CURR:
+ return SR_UNIT_AMPERE;
+ case ENRG_VOL:
+ return SR_UNIT_VOLT;
+ case TEMP_IN: /* Fallthrough */
+ case TEMP_OUT:
+ return SR_UNIT_CELSIUS;
+ default:
+ return -1;
+ }
+}
+
+/* We need to scale measurements down from the units used by the drivers. */
+static float adjust_data(int val, int type)
+{
+ switch (type) {
+ case ENRG_PWR:
+ return ((float)val) / 1000000.0;
+ case ENRG_CURR: /* Fallthrough */
+ case ENRG_VOL: /* Fallthrough */
+ case TEMP_IN: /* Fallthrough */
+ case TEMP_OUT:
+ return ((float)val) / 1000.0;
+ default:
+ return 0.0;
+ }
+}
+
+static float read_sample(struct sr_channel *ch)
+{
+ struct channel_priv *chp;
+ char buf[16];
+ ssize_t len;
+ int fd;
+
+ chp = ch->priv;
+ fd = chp->fd;
+
+ lseek(fd, 0, SEEK_SET);
+
+ len = read(fd, buf, sizeof(buf));
+ if (len < 0) {
+ sr_err("Error reading from channel %s (hwmon: %s): %s",
+ ch->name, chp->probe->hwmon_num, strerror(errno));
+ ch->enabled = FALSE;
+ return -1.0;
+ }
+
+ return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
+}
+
+SR_PRIV int bl_acme_open_channel(struct sr_channel *ch)
+{
+ struct channel_priv *chp;
+ char path[64], *file;
+ int fd;
+
+ chp = ch->priv;
+
+ switch (chp->ch_type) {
+ case ENRG_PWR: file = "power1_input"; break;
+ case ENRG_CURR: file = "curr1_input"; break;
+ case ENRG_VOL: file = "in1_input"; break;
+ case TEMP_IN: file = "temp1_input"; break;
+ case TEMP_OUT: file = "temp2_input"; break;
+ default:
+ sr_err("Invalid channel type: %d.", chp->ch_type);
+ return SR_ERR;
+ }
+
+ snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
+ chp->probe->hwmon_num, file);
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ sr_err("Error opening %s: %s", path, strerror(errno));
+ ch->enabled = FALSE;
+ return SR_ERR;
+ }
+
+ chp->fd = fd;
+
+ return 0;
+}
+
+SR_PRIV void bl_acme_close_channel(struct sr_channel *ch)
+{
+ struct channel_priv *chp;
+
+ chp = ch->priv;
+ close(chp->fd);
+ chp->fd = -1;
+}
+
+SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
+{
+ uint32_t cur_time, elapsed_time, diff_time;
+ int64_t time_to_sleep;
+ struct sr_datafeed_packet packet, framep;
+ struct sr_datafeed_analog analog;
+ struct sr_dev_inst *sdi;
+ struct sr_channel *ch;
struct dev_context *devc;
+ GSList *chl, chonly;
+ float valf;
(void)fd;
+ (void)revents;
- if (!(sdi = cb_data))
+ sdi = cb_data;
+ if (!sdi)
return TRUE;
- if (!(devc = sdi->priv))
+ devc = sdi->priv;
+ if (!devc)
+ return TRUE;
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+ analog.data = &valf;
+
+ /*
+ * Reading from sysfs takes some time - try to keep up with samplerate.
+ */
+ if (devc->samples_read) {
+ cur_time = g_get_monotonic_time();
+ diff_time = cur_time - devc->last_sample_fin;
+ time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time;
+ if (time_to_sleep > 0)
+ g_usleep(time_to_sleep);
+ }
+
+ framep.type = SR_DF_FRAME_BEGIN;
+ sr_session_send(cb_data, &framep);
+
+ /*
+ * Due to different units used in each channel we're sending
+ * samples one-by-one.
+ */
+ for (chl = sdi->channels; chl; chl = chl->next) {
+ ch = chl->data;
+ if (!ch->enabled)
+ continue;
+ chonly.next = NULL;
+ chonly.data = ch;
+ analog.channels = &chonly;
+ analog.num_samples = 1;
+ analog.mq = channel_to_mq(chl->data);
+ analog.unit = channel_to_unit(ch);
+
+ valf = read_sample(ch);
+
+ sr_session_send(cb_data, &packet);
+ }
+
+ framep.type = SR_DF_FRAME_END;
+ sr_session_send(cb_data, &framep);
+
+ devc->samples_read++;
+ if (devc->limit_samples > 0 &&
+ devc->samples_read >= devc->limit_samples) {
+ sr_info("Requested number of samples reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ devc->last_sample_fin = g_get_monotonic_time();
return TRUE;
+ } else if (devc->limit_msec > 0) {
+ cur_time = g_get_monotonic_time();
+ elapsed_time = cur_time - devc->start_time;
- if (revents == G_IO_IN) {
- /* TODO */
+ if (elapsed_time >= devc->limit_msec) {
+ sr_info("Sampling time limit reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ devc->last_sample_fin = g_get_monotonic_time();
+ return TRUE;
+ }
}
+ devc->last_sample_fin = g_get_monotonic_time();
return TRUE;
}