Re: [PATCH 10/12] hwmon: lis3: Enhance lis3 selftest with IRQ line test

["Éric Piel" <eric.piel@tremplin-utc.net>]

Op 22-10-10 13:57, Samu Onkalo schreef:
> Configure chip to data ready mode in selftest and count received
> interrupts to see that interrupt line(s) are working.
>
> Signed-off-by: Samu Onkalo<samu.p.onkalo@nokia.com>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
> ---
>   drivers/hwmon/lis3lv02d.c |   87 ++++++++++++++++++++++++++++++++++++++++----
>   drivers/hwmon/lis3lv02d.h |    3 +-
>   2 files changed, 81 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
> index 9fd946c..f0343f3 100644
> --- a/drivers/hwmon/lis3lv02d.c
> +++ b/drivers/hwmon/lis3lv02d.c
> @@ -48,6 +48,13 @@
>
>   #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
>
> +#define SELFTEST_OK	       0
> +#define SELFTEST_FAIL	       -1
> +#define SELFTEST_IRQ	       -2
> +
> +#define IRQ_LINE0	       0
> +#define IRQ_LINE1	       1
> +
>   /*
>    * The sensor can also generate interrupts (DRDY) but it's pretty pointless
>    * because they are generated even if the data do not change. So it's better
> @@ -198,6 +205,8 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
>   	s16 x, y, z;
>   	u8 selftest;
>   	int ret;
> +	u8 ctrl_reg_data;
> +	unsigned char irq_cfg;
>
>   	mutex_lock(&lis3->mutex);
>   	if (lis3_dev.whoami == WAI_12B)
> @@ -205,6 +214,20 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
>   	else
>   		selftest = CTRL1_STP;
>
> +	irq_cfg = lis3->irq_cfg;
> +	if (lis3_dev.whoami == WAI_8B) {
> +		lis3->data_ready_count[IRQ_LINE0] = 0;
> +		lis3->data_ready_count[IRQ_LINE1] = 0;
> +
> +		/* Change interrupt cfg to data ready for selftest */
> +		atomic_inc(&lis3_dev.wake_thread);
> +		lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
> +		lis3->read(lis3, CTRL_REG3,&ctrl_reg_data);
> +		lis3->write(lis3, CTRL_REG3, (ctrl_reg_data&
> +				~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
> +				(LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
> +	}
> +
>   	lis3->read(lis3, CTRL_REG1,&reg);
>   	lis3->write(lis3, CTRL_REG1, (reg | selftest));
>   	msleep(lis3->pwron_delay / lis3lv02d_get_odr());
> @@ -223,13 +246,33 @@ static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
>   	results[2] = z - lis3->read_data(lis3, OUTZ);
>
>   	ret = 0;
> +
> +	if (lis3_dev.whoami == WAI_8B) {
> +		/* Restore original interrupt configuration */
> +		atomic_dec(&lis3_dev.wake_thread);
> +		lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
> +		lis3->irq_cfg = irq_cfg;
> +
> +		if ((irq_cfg&  LIS3_IRQ1_MASK)&&
> +			lis3->data_ready_count[IRQ_LINE0]<  2) {
> +			ret = SELFTEST_IRQ;
> +			goto fail;
> +		}
> +
> +		if ((irq_cfg&  LIS3_IRQ2_MASK)&&
> +			lis3->data_ready_count[IRQ_LINE1]<  2) {
> +			ret = SELFTEST_IRQ;
> +			goto fail;
> +		}
> +	}
> +
>   	if (lis3->pdata) {
>   		int i;
>   		for (i = 0; i<  3; i++) {
>   			/* Check against selftest acceptance limits */
>   			if ((results[i]<  lis3->pdata->st_min_limits[i]) ||
>   			    (results[i]>  lis3->pdata->st_max_limits[i])) {
> -				ret = -EIO;
> +				ret = SELFTEST_FAIL;
>   				goto fail;
>   			}
>   		}
> @@ -392,13 +435,24 @@ static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
>   	mutex_unlock(&lis3->mutex);
>   }
>
> -static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
> +static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
>   {
> +	int dummy;
>
> +	/* Dummy read to ack interrupt */
> +	lis3lv02d_get_xyz(lis3,&dummy,&dummy,&dummy);
> +	lis3->data_ready_count[index]++;
> +}
> +
> +static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
> +{
>   	struct lis3lv02d *lis3 = data;
> +	u8 irq_cfg = lis3->irq_cfg&  LIS3_IRQ1_MASK;
>
> -	if ((lis3->irq_cfg&  LIS3_IRQ1_MASK) == LIS3_IRQ1_CLICK)
> +	if (irq_cfg == LIS3_IRQ1_CLICK)
>   		lis302dl_interrupt_handle_click(lis3);
> +	else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
> +		lis302dl_data_ready(lis3, IRQ_LINE0);
>   	else
>   		lis3lv02d_joystick_poll(lis3->idev);
>
> @@ -407,11 +461,13 @@ static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
>
>   static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
>   {
> -
>   	struct lis3lv02d *lis3 = data;
> +	u8 irq_cfg = lis3->irq_cfg&  LIS3_IRQ2_MASK;
>
> -	if ((lis3->irq_cfg&  LIS3_IRQ2_MASK) == LIS3_IRQ2_CLICK)
> +	if (irq_cfg == LIS3_IRQ2_CLICK)
>   		lis302dl_interrupt_handle_click(lis3);
> +	else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
> +		lis302dl_data_ready(lis3, IRQ_LINE1);
>   	else
>   		lis3lv02d_joystick_poll(lis3->idev);
>
> @@ -614,12 +670,27 @@ static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
>   static ssize_t lis3lv02d_selftest_show(struct device *dev,
>   				struct device_attribute *attr, char *buf)
>   {
> -	int result;
>   	s16 values[3];
>
> +	static const char ok[] = "OK";
> +	static const char fail[] = "FAIL";
> +	static const char irq[] = "FAIL_IRQ";
> +	const char *res;
> +
>   	lis3lv02d_sysfs_poweron(&lis3_dev);
> -	result = lis3lv02d_selftest(&lis3_dev, values);
> -	return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
> +	switch (lis3lv02d_selftest(&lis3_dev, values)) {
> +	case SELFTEST_FAIL:
> +		res = fail;
> +		break;
> +	case SELFTEST_IRQ:
> +		res = irq;
> +		break;
> +	case SELFTEST_OK:
> +	default:
> +		res = ok;
> +		break;
> +	}
> +	return sprintf(buf, "%s %d %d %d\n", res,
>   		values[0], values[1], values[2]);
>   }
>
> diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
> index d3cb662..7b22cd9 100644
> --- a/drivers/hwmon/lis3lv02d.h
> +++ b/drivers/hwmon/lis3lv02d.h
> @@ -254,7 +254,8 @@ struct lis3lv02d {
>   	struct fasync_struct	*async_queue; /* queue for the misc device */
>   	wait_queue_head_t	misc_wait; /* Wait queue for the misc device */
>   	unsigned long		misc_opened; /* bit0: whether the device is open */
> -	atomic_t                wake_thread;
> +	int                     data_ready_count[2];
> +	atomic_t		wake_thread;
>   	unsigned char           irq_cfg;
>
>   	struct lis3lv02d_platform_data *pdata;	/* for passing board config */