[PATCH] Add EON Steel gas change event parsing

[Linus Torvalds]

From: Linus Torvalds <torvalds at linux-foundation.org>
Date: Fri, 2 Jan 2015 22:23:40 -0800
Subject: [PATCH] Add EON Steel gas change event parsing

The really sad part is that the EON Steel handles gas change events
correctly, by actually saying which cylinder it switches to.  But the
libdivecomputer interfaces are broken, and only contain the gas *mix*
you switch to, which is ambiguous since you could have the same mix in
multiple cylinders.

Maybe we could put the one-based cylinder index into the "flags" field?
With zero meaning "unknown". That would be a straightforward extension.

Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
---

It's really sad how this loses the cylinder number information, but other 
than that it seems to work for me.

There's a lot of other events that I don't parse, and that I now have that 
Don took the EON Steel down to 200 ft with trimix and sharks, but this is 
the primary missing one.

 src/suunto_eonsteel_parser.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/suunto_eonsteel_parser.c b/src/suunto_eonsteel_parser.c
index 6c4f4aba3d39..d5bfb0e74942 100644
--- a/src/suunto_eonsteel_parser.c
+++ b/src/suunto_eonsteel_parser.c
@@ -291,6 +291,25 @@ static void sample_cylinder_pressure(struct sample_data *info, unsigned char idx
 	if (info->callback) info->callback(DC_SAMPLE_PRESSURE, sample, info->userdata);
 }
 
+static void sample_gas_switch_event(struct sample_data *info, unsigned short idx)
+{
+	suunto_eonsteel_parser_t *eon = info->eon;
+	dc_sample_value_t sample = {0};
+	int o2, he;
+
+	if (idx < 1 || idx > eon->cache.ngases)
+		return;
+
+	// Horrible, broken, gas change events
+	o2 = 100 * eon->cache.gasmix[idx-1].oxygen;
+	he = 100 * eon->cache.gasmix[idx-1].helium;
+
+	sample.event.type = SAMPLE_EVENT_GASCHANGE2;
+	sample.event.value = o2 | (he << 16);
+
+	if (info->callback) info->callback(DC_SAMPLE_EVENT, sample, info->userdata);
+}
+
 static int traverse_samples(unsigned short type, const struct type_desc *desc, const unsigned char *data, int len, void *user)
 {
 	struct sample_data *info = (struct sample_data *) user;
@@ -311,6 +330,9 @@ static int traverse_samples(unsigned short type, const struct type_desc *desc, c
 	case 0x000a: // cylinder idx in first byte, pressure in next word
 		sample_cylinder_pressure(info, data[0], array_uint16_le(data+1));
 		break;
+	case 0x001d:
+		sample_gas_switch_event(info, array_uint16_le(data));
+		break;
 	}
 	return 0;
 }
-- 
2.2.1.212.gc5b9256