diff options
Diffstat (limited to 'drivers/w1/slaves/w1_therm.c')
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index a1ef9b5b38cf..ff29ae747ee8 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -175,11 +175,13 @@ static ssize_t w1_therm_read(struct device *device, { struct w1_slave *sl = dev_to_w1_slave(device); struct w1_master *dev = sl->master; - u8 rom[9], crc, verdict; + u8 rom[9], crc, verdict, external_power; int i, max_trying = 10; ssize_t c = PAGE_SIZE; - mutex_lock(&dev->mutex); + i = mutex_lock_interruptible(&dev->mutex); + if (i != 0) + return i; memset(rom, 0, sizeof(rom)); @@ -190,13 +192,37 @@ static ssize_t w1_therm_read(struct device *device, if (!w1_reset_select_slave(sl)) { int count = 0; unsigned int tm = 750; + unsigned long sleep_rem; + + w1_write_8(dev, W1_READ_PSUPPLY); + external_power = w1_read_8(dev); + + if (w1_reset_select_slave(sl)) + continue; /* 750ms strong pullup (or delay) after the convert */ - if (w1_strong_pullup) + if (!external_power && w1_strong_pullup) w1_next_pullup(dev, tm); + w1_write_8(dev, W1_CONVERT_TEMP); - if (!w1_strong_pullup) - msleep(tm); + + if (external_power) { + mutex_unlock(&dev->mutex); + + sleep_rem = msleep_interruptible(tm); + if (sleep_rem != 0) + return -EINTR; + + i = mutex_lock_interruptible(&dev->mutex); + if (i != 0) + return i; + } else if (!w1_strong_pullup) { + sleep_rem = msleep_interruptible(tm); + if (sleep_rem != 0) { + mutex_unlock(&dev->mutex); + return -EINTR; + } + } if (!w1_reset_select_slave(sl)) { |