baylibre-acme: Read EEPROM contents into buffer before processing.

Instead of using a non-standard packed attribute, read the contents of the
probe EEPROM into a buffer and then process it using the R* macros.

Signed-off-by: Bartosz Golaszewski <redacted>

diff --git a/src/hardware/baylibre-acme/protocol.c b/src/hardware/baylibre-acme/protocol.c
index 969fea0f071218dfe34f0bc1bb9363a781af0e83..db1b57573d9173ade5fe425b9d425e4df76ed040 100644 (file)
--- a/src/hardware/baylibre-acme/protocol.c
+++ b/src/hardware/baylibre-acme/protocol.c
@@ -68,7 +68,16 @@ struct probe_eeprom {
        uint8_t pwr_sw;
        uint8_t serial[EEPROM_SERIAL_SIZE];
        int8_t tag[EEPROM_TAG_SIZE];
-} __attribute__((packed));
+};
+
+#define EEPROM_SIZE (3 * sizeof(uint32_t) + 1 + EEPROM_SERIAL_SIZE + EEPROM_TAG_SIZE)
+
+#define EEPROM_OFF_TYPE                0
+#define EEPROM_OFF_REV         sizeof(uint32_t)
+#define EEPROM_OFF_SHUNT       (2 * sizeof(uint32_t))
+#define EEPROM_OFF_PWR_SW      (3 * sizeof(uint32_t))
+#define EEPROM_OFF_SERIAL      (3 * sizeof(uint32_t) + 1)
+#define EEPROM_OFF_TAG         (EEPROM_OFF_SERIAL + EEPROM_SERIAL_SIZE)
 
 static const uint8_t enrg_i2c_addrs[] = {
        0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
@@ -256,9 +265,8 @@ static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
 
 static int read_probe_eeprom(unsigned int addr, struct probe_eeprom *eeprom)
 {
-       static const ssize_t len = sizeof(struct probe_eeprom);
-
        GString *path = g_string_sized_new(64);
+       char eeprom_buf[EEPROM_SIZE];
        ssize_t rd;
        int fd;
 
@@ -268,18 +276,16 @@ static int read_probe_eeprom(unsigned int addr, struct probe_eeprom *eeprom)
        if (fd < 0)
                return -1;
 
-       rd = read(fd, eeprom, len);
+       rd = read(fd, eeprom_buf, EEPROM_SIZE);
        g_close(fd, NULL);
-       if (rd != len)
+       if (rd != EEPROM_SIZE)
                return -1;
 
-       /*
-        * All integer types are in network byte order. Convert them to
-        * host order before proceeding.
-        */
-       eeprom->type = ntohl(eeprom->type);
-       eeprom->rev = ntohl(eeprom->rev);
-       eeprom->shunt = ntohl(eeprom->shunt);
+       eeprom->type = RL32(eeprom_buf + EEPROM_OFF_TYPE);
+       eeprom->rev = RL32(eeprom_buf + EEPROM_OFF_REV);
+       eeprom->shunt = RL32(eeprom_buf + EEPROM_OFF_SHUNT);
+       eeprom->pwr_sw = R8(eeprom_buf + EEPROM_OFF_PWR_SW);
+       /* Don't care about the serial number and tag for now. */
 
        /* Check if we have some sensible values. */
        if (eeprom->rev != 'B')
@@ -328,6 +334,7 @@ SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
         * See if we can read the EEPROM contents. If not, assume it's
         * a revision A probe.
         */
+       memset(&eeprom, 0, sizeof(struct probe_eeprom));
        status = read_probe_eeprom(addr, &eeprom);
        cgp->rev = status < 0 ? ACME_REV_A : ACME_REV_B;