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| author |   Chase Southwood <chase.southwood@yahoo.com> | 2014-04-03 18:43:27 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-14 08:29:25 -0700 |
| commit | 571845c6f47de51a41ab7964a144b22d297d06ce (patch) | |
| tree | 800672c41b238873c1fe84612068631b2bb4d80a /drivers/staging/comedi/drivers/s626.c | |
| parent | staging: comedi: drivers.c: Fix missing a blank line, after declarations warning (diff) | |
| download | linux-dev-571845c6f47de51a41ab7964a144b22d297d06ce.tar.xz linux-dev-571845c6f47de51a41ab7964a144b22d297d06ce.zip | |
staging: comedi: s626: use comedi_timeout() on remaining loops
There were just a handful of more while loops in this file that needed
timeouts, and this patch takes care of them. One new callback is
introduced, and all of the proper comedi_timeout() calls are then used.
The return type of s626_i2c_handshake() has been changed from uint32_t to
int so that a negative error code from comedi_timeout() can be propagated
if necessary.
Signed-off-by: Chase Southwood <chase.southwood@yahoo.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/s626.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/s626.c | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c index 95fadf343f27..6da43de51eb3 100644 --- a/drivers/staging/comedi/drivers/s626.c +++ b/drivers/staging/comedi/drivers/s626.c @@ -295,10 +295,24 @@ static void s626_debi_replace(struct comedi_device *dev, unsigned int addr, /* ************** EEPROM ACCESS FUNCTIONS ************** */ -static uint32_t s626_i2c_handshake(struct comedi_device *dev, uint32_t val) +static int s626_i2c_handshake_eoc(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned long context) +{ + bool status; + + status = s626_mc_test(dev, S626_MC2_UPLD_IIC, S626_P_MC2); + if (status) + return 0; + return -EBUSY; +} + +static int s626_i2c_handshake(struct comedi_device *dev, uint32_t val) { struct s626_private *devpriv = dev->private; unsigned int ctrl; + int ret; /* Write I2C command to I2C Transfer Control shadow register */ writel(val, devpriv->mmio + S626_P_I2CCTRL); @@ -308,8 +322,9 @@ static uint32_t s626_i2c_handshake(struct comedi_device *dev, uint32_t val) * wait for upload confirmation. */ s626_mc_enable(dev, S626_MC2_UPLD_IIC, S626_P_MC2); - while (!s626_mc_test(dev, S626_MC2_UPLD_IIC, S626_P_MC2)) - ; + ret = comedi_timeout(dev, NULL, NULL, s626_i2c_handshake_eoc, 0); + if (ret) + return ret; /* Wait until I2C bus transfer is finished or an error occurs */ do { @@ -2029,8 +2044,9 @@ static int s626_ai_insn_read(struct comedi_device *dev, /* Wait for the data to arrive in FB BUFFER 1 register. */ /* Wait for ADC done */ - while (!(readl(devpriv->mmio + S626_P_PSR) & S626_PSR_GPIO2)) - ; + ret = comedi_timeout(dev, s, insn, s626_ai_eoc, 0); + if (ret) + return ret; /* Fetch ADC data from audio interface's input shift register. */ @@ -2681,8 +2697,9 @@ static int s626_initialize(struct comedi_device *dev) writel(S626_I2C_CLKSEL | S626_I2C_ABORT, devpriv->mmio + S626_P_I2CSTAT); s626_mc_enable(dev, S626_MC2_UPLD_IIC, S626_P_MC2); - while (!(readl(devpriv->mmio + S626_P_MC2) & S626_MC2_UPLD_IIC)) - ; + ret = comedi_timeout(dev, NULL, NULL, s626_i2c_handshake_eoc, 0); + if (ret) + return ret; /* * Per SAA7146 data sheet, write to STATUS @@ -2691,8 +2708,9 @@ static int s626_initialize(struct comedi_device *dev) for (i = 0; i < 2; i++) { writel(S626_I2C_CLKSEL, devpriv->mmio + S626_P_I2CSTAT); s626_mc_enable(dev, S626_MC2_UPLD_IIC, S626_P_MC2); - while (!s626_mc_test(dev, S626_MC2_UPLD_IIC, S626_P_MC2)) - ; + ret = comedi_timeout(dev, NULL, NULL, s626_i2c_handshake_eoc, 0); + if (ret) + return ret; } /* |