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Subject[PATCH 24/30] W1: ds2490.c ds_dump_status rework
Date
- add result register #defines
- rename ds_dump_status to ds_print_msg
- rename ds_recv_status to ds_dump_status
- ds_dump_status prints the requested status and no longer reads the
status, this is because the second status read can return different
data for example the result register
- the result register will be printed, though limited to detecting a
new device, detecting other values such as a short would require
additional reporting methods
- ST_EPOF was moved to ds_wait_status to clear the error condition
sooner

Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

---
drivers/w1/masters/ds2490.c | 134 +++++++++++++++++++++++++++----------------
1 files changed, 84 insertions(+), 50 deletions(-)
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c
index b1ae1a0..0bcdd3f 100644
--- a/drivers/w1/masters/ds2490.c
+++ b/drivers/w1/masters/ds2490.c
@@ -107,6 +107,17 @@
#define ST_IDLE 0x20 /* DS2490 is currently idle */
#define ST_EPOF 0x80

+/* Result Register flags */
+#define RR_DETECT 0xA5 /* New device detected */
+#define RR_NRS 0x01 /* Reset no presence or ... */
+#define RR_SH 0x02 /* short on reset or set path */
+#define RR_APP 0x04 /* alarming presence on reset */
+#define RR_VPP 0x08 /* 12V expected not seen */
+#define RR_CMP 0x10 /* compare error */
+#define RR_CRC 0x20 /* CRC error detected */
+#define RR_RDP 0x40 /* redirected page */
+#define RR_EOS 0x80 /* end of search error */
+
#define SPEED_NORMAL 0x00
#define SPEED_FLEXIBLE 0x01
#define SPEED_OVERDRIVE 0x02
@@ -164,7 +175,6 @@ MODULE_DEVICE_TABLE(usb, ds_id_table);
static int ds_probe(struct usb_interface *, const struct usb_device_id *);
static void ds_disconnect(struct usb_interface *);

-static inline void ds_dump_status(unsigned char *, unsigned char *, int);
static int ds_send_control(struct ds_device *, u16, u16);
static int ds_send_control_cmd(struct ds_device *, u16, u16);

@@ -223,11 +233,6 @@ static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
return err;
}

-static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off)
-{
- printk("%45s: %8x\n", str, buf[off]);
-}
-
static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
unsigned char *buf, int size)
{
@@ -248,54 +253,62 @@ static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
return count;
}

-static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
+static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
{
- unsigned char buf[64];
- int count, err = 0, i;
-
- memcpy(st, buf, sizeof(*st));
+ printk(KERN_INFO "%45s: %8x\n", str, buf[off]);
+}

- count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
- if (count < 0)
- return err;
+static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
+{
+ int i;

- printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
+ printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
for (i=0; i<count; ++i)
printk("%02x ", buf[i]);
- printk("\n");
+ printk(KERN_INFO "\n");

if (count >= 16) {
- ds_dump_status(buf, "enable flag", 0);
- ds_dump_status(buf, "1-wire speed", 1);
- ds_dump_status(buf, "strong pullup duration", 2);
- ds_dump_status(buf, "programming pulse duration", 3);
- ds_dump_status(buf, "pulldown slew rate control", 4);
- ds_dump_status(buf, "write-1 low time", 5);
- ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
- ds_dump_status(buf, "reserved (test register)", 7);
- ds_dump_status(buf, "device status flags", 8);
- ds_dump_status(buf, "communication command byte 1", 9);
- ds_dump_status(buf, "communication command byte 2", 10);
- ds_dump_status(buf, "communication command buffer status", 11);
- ds_dump_status(buf, "1-wire data output buffer status", 12);
- ds_dump_status(buf, "1-wire data input buffer status", 13);
- ds_dump_status(buf, "reserved", 14);
- ds_dump_status(buf, "reserved", 15);
+ ds_print_msg(buf, "enable flag", 0);
+ ds_print_msg(buf, "1-wire speed", 1);
+ ds_print_msg(buf, "strong pullup duration", 2);
+ ds_print_msg(buf, "programming pulse duration", 3);
+ ds_print_msg(buf, "pulldown slew rate control", 4);
+ ds_print_msg(buf, "write-1 low time", 5);
+ ds_print_msg(buf, "data sample offset/write-0 recovery time",
+ 6);
+ ds_print_msg(buf, "reserved (test register)", 7);
+ ds_print_msg(buf, "device status flags", 8);
+ ds_print_msg(buf, "communication command byte 1", 9);
+ ds_print_msg(buf, "communication command byte 2", 10);
+ ds_print_msg(buf, "communication command buffer status", 11);
+ ds_print_msg(buf, "1-wire data output buffer status", 12);
+ ds_print_msg(buf, "1-wire data input buffer status", 13);
+ ds_print_msg(buf, "reserved", 14);
+ ds_print_msg(buf, "reserved", 15);
}
-
- memcpy(st, buf, sizeof(*st));
-
- if (st->status & ST_EPOF) {
- printk(KERN_INFO "Resetting device after ST_EPOF.\n");
- err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
- if (err)
- return err;
- count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
- if (count < 0)
- return err;
+ for (i = 16; i < count; ++i) {
+ if (buf[i] == RR_DETECT) {
+ ds_print_msg(buf, "new device detect", i);
+ continue;
+ }
+ ds_print_msg(buf, "Result Register Value: ", i);
+ if (buf[i] & RR_NRS)
+ printk(KERN_INFO "NRS: Reset no presence or ...\n");
+ if (buf[i] & RR_SH)
+ printk(KERN_INFO "SH: short on reset or set path\n");
+ if (buf[i] & RR_APP)
+ printk(KERN_INFO "APP: alarming presence on reset\n");
+ if (buf[i] & RR_VPP)
+ printk(KERN_INFO "VPP: 12V expected not seen\n");
+ if (buf[i] & RR_CMP)
+ printk(KERN_INFO "CMP: compare error\n");
+ if (buf[i] & RR_CRC)
+ printk(KERN_INFO "CRC: CRC error detected\n");
+ if (buf[i] & RR_RDP)
+ printk(KERN_INFO "RDP: redirected page\n");
+ if (buf[i] & RR_EOS)
+ printk(KERN_INFO "EOS: end of search error\n");
}
-
- return err;
}

static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
@@ -307,9 +320,14 @@ static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
buf, size, &count, 1000);
if (err < 0) {
+ u8 buf[0x20];
+ int count;
+
printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
- ds_recv_status(dev, &st);
+
+ count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
+ ds_dump_status(dev, buf, count);
return err;
}

@@ -390,7 +408,7 @@ int ds_detect(struct ds_device *dev, struct ds_status *st)
if (err)
return err;

- err = ds_recv_status(dev, st);
+ err = ds_dump_status(dev, st);

return err;
}
@@ -415,11 +433,27 @@ static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
#endif
} while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);

+ if (err >= 16 && st->status & ST_EPOF) {
+ printk(KERN_INFO "Resetting device after ST_EPOF.\n");
+ ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
+ /* Always dump the device status. */
+ count = 101;
+ }
+
+ /* Dump the status for errors or if there is extended return data.
+ * The extended status includes new device detection (maybe someone
+ * can do something with it).
+ */
+ if (err > 16 || count >= 100 || err < 0)
+ ds_dump_status(dev, buf, err);

- if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
- ds_recv_status(dev, st);
+ /* Extended data isn't an error. Well, a short is, but the dump
+ * would have already told the user that and we can't do anything
+ * about it in software anyway.
+ */
+ if (count >= 100 || err < 0)
return -1;
- } else
+ else
return 0;
}

--
1.4.4.4


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