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Date: Sun, 24 Oct 2010 16:58:53 +0200
From: Éric Piel <eric.piel@...mplin-utc.net>
To: Samu Onkalo <samu.p.onkalo@...ia.com>
CC: khali@...ux-fr.org, guenter.roeck@...csson.com, jic23@....ac.uk,
lm-sensors@...sensors.org, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] hwmon: lis3: Enhance lis3 selftest with IRQ line
test
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@...ia.com>
Acked-by: Eric Piel <eric.piel@...mplin-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,®);
> 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 */
--
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