Input: imx6ul_tsc - propagate the errors

imx6ul_adc_init() may fail in two cases, so we should better
propagate the errors and make sure that the callers of
this function also check and propagate the errors accordingly.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/imx6ul_tsc.c b/drivers/input/touchscreen/imx6ul_tsc.c
index ff0b75813daa21cff6f8baccfbf453a06ebf383b..0a96b76f60214d9653525d132cd3b2d58b7de790 100644 (file)
--- a/drivers/input/touchscreen/imx6ul_tsc.c
+++ b/drivers/input/touchscreen/imx6ul_tsc.c
@@ -94,7 +94,7 @@ struct imx6ul_tsc {
  * TSC module need ADC to get the measure value. So
  * before config TSC, we should initialize ADC module.
  */
-static void imx6ul_adc_init(struct imx6ul_tsc *tsc)
+static int imx6ul_adc_init(struct imx6ul_tsc *tsc)
 {
        int adc_hc = 0;
        int adc_gc;
@@ -122,17 +122,23 @@ static void imx6ul_adc_init(struct imx6ul_tsc *tsc)
 
        timeout = wait_for_completion_timeout
                        (&tsc->completion, ADC_TIMEOUT);
-       if (timeout == 0)
+       if (timeout == 0) {
                dev_err(tsc->dev, "Timeout for adc calibration\n");
+               return -ETIMEDOUT;
+       }
 
        adc_gs = readl(tsc->adc_regs + REG_ADC_GS);
-       if (adc_gs & ADC_CALF)
+       if (adc_gs & ADC_CALF) {
                dev_err(tsc->dev, "ADC calibration failed\n");
+               return -EINVAL;
+       }
 
        /* TSC need the ADC work in hardware trigger */
        adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
        adc_cfg |= ADC_HARDWARE_TRIGGER;
        writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
+
+       return 0;
 }
 
 /*
@@ -188,11 +194,17 @@ static void imx6ul_tsc_set(struct imx6ul_tsc *tsc)
        writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
 }
 
-static void imx6ul_tsc_init(struct imx6ul_tsc *tsc)
+static int imx6ul_tsc_init(struct imx6ul_tsc *tsc)
 {
-       imx6ul_adc_init(tsc);
+       int err;
+
+       err = imx6ul_adc_init(tsc);
+       if (err)
+               return err;
        imx6ul_tsc_channel_config(tsc);
        imx6ul_tsc_set(tsc);
+
+       return 0;
 }
 
 static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc)
@@ -311,9 +323,7 @@ static int imx6ul_tsc_open(struct input_dev *input_dev)
                return err;
        }
 
-       imx6ul_tsc_init(tsc);
-
-       return 0;
+       return imx6ul_tsc_init(tsc);
 }
 
 static void imx6ul_tsc_close(struct input_dev *input_dev)
@@ -491,7 +501,7 @@ static int __maybe_unused imx6ul_tsc_resume(struct device *dev)
                        goto out;
                }
 
-               imx6ul_tsc_init(tsc);
+               retval = imx6ul_tsc_init(tsc);
        }
 
 out: