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path: root/drivers/w1/masters/ds2490.c
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Diffstat (limited to 'drivers/w1/masters/ds2490.c')
-rw-r--r--drivers/w1/masters/ds2490.c76
1 files changed, 38 insertions, 38 deletions
diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c
index c8365fb20b4..6b188e8008e 100644
--- a/drivers/w1/masters/ds2490.c
+++ b/drivers/w1/masters/ds2490.c
@@ -98,11 +98,6 @@
#define BRANCH_MAIN 0xCC
#define BRANCH_AUX 0x33
-/*
- * Duration of the strong pull-up pulse in milliseconds.
- */
-#define PULLUP_PULSE_DURATION 750
-
/* Status flags */
#define ST_SPUA 0x01 /* Strong Pull-up is active */
#define ST_PRGA 0x02 /* 12V programming pulse is being generated */
@@ -131,6 +126,11 @@ struct ds_device
int ep[NUM_EP];
+ /* Strong PullUp
+ * 0: pullup not active, else duration in milliseconds
+ */
+ int spu_sleep;
+
struct w1_bus_master master;
};
@@ -192,7 +192,7 @@ static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
return err;
}
-#if 0
+
static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
{
int err;
@@ -207,7 +207,7 @@ static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
return err;
}
-#endif
+
static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
{
int err;
@@ -294,14 +294,6 @@ static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
if (count < 0)
return err;
}
-#if 0
- if (st->status & ST_IDLE) {
- printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
- err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
- if (err)
- return err;
- }
-#endif
return err;
}
@@ -472,32 +464,26 @@ static int ds_set_speed(struct ds_device *dev, int speed)
}
#endif /* 0 */
-static int ds_start_pulse(struct ds_device *dev, int delay)
+static int ds_set_pullup(struct ds_device *dev, int delay)
{
int err;
u8 del = 1 + (u8)(delay >> 4);
- struct ds_status st;
-
-#if 0
- err = ds_stop_pulse(dev, 10);
- if (err)
- return err;
-
- err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
- if (err)
- return err;
-#endif
- err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
- if (err)
- return err;
- err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
+ dev->spu_sleep = 0;
+ err = ds_send_control_mode(dev, MOD_PULSE_EN, delay ? PULSE_SPUE : 0);
if (err)
return err;
- mdelay(delay);
+ if (delay) {
+ err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
+ if (err)
+ return err;
- ds_wait_status(dev, &st);
+ /* Just storing delay would not get the trunication and
+ * roundup.
+ */
+ dev->spu_sleep = del<<4;
+ }
return err;
}
@@ -558,6 +544,9 @@ static int ds_write_byte(struct ds_device *dev, u8 byte)
if (err)
return err;
+ if (dev->spu_sleep)
+ msleep(dev->spu_sleep);
+
err = ds_wait_status(dev, &st);
if (err)
return err;
@@ -566,8 +555,6 @@ static int ds_write_byte(struct ds_device *dev, u8 byte)
if (err < 0)
return err;
- ds_start_pulse(dev, PULLUP_PULSE_DURATION);
-
return !(byte == rbyte);
}
@@ -603,7 +590,7 @@ static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
if (err < 0)
return err;
- err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
+ err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
if (err)
return err;
@@ -630,14 +617,15 @@ static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
if (err)
return err;
+ if (dev->spu_sleep)
+ msleep(dev->spu_sleep);
+
ds_wait_status(dev, &st);
err = ds_recv_data(dev, buf, len);
if (err < 0)
return err;
- ds_start_pulse(dev, PULLUP_PULSE_DURATION);
-
return !(err == len);
}
@@ -803,6 +791,16 @@ static u8 ds9490r_reset(void *data)
return 0;
}
+static u8 ds9490r_set_pullup(void *data, int delay)
+{
+ struct ds_device *dev = data;
+
+ if (ds_set_pullup(dev, delay))
+ return 1;
+
+ return 0;
+}
+
static int ds_w1_init(struct ds_device *dev)
{
memset(&dev->master, 0, sizeof(struct w1_bus_master));
@@ -816,6 +814,7 @@ static int ds_w1_init(struct ds_device *dev)
dev->master.read_block = &ds9490r_read_block;
dev->master.write_block = &ds9490r_write_block;
dev->master.reset_bus = &ds9490r_reset;
+ dev->master.set_pullup = &ds9490r_set_pullup;
return w1_add_master_device(&dev->master);
}
@@ -839,6 +838,7 @@ static int ds_probe(struct usb_interface *intf,
printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
return -ENOMEM;
}
+ dev->spu_sleep = 0;
dev->udev = usb_get_dev(udev);
if (!dev->udev) {
err = -ENOMEM;