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lis3: interrupt handlers for 8bit wakeup and click events
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Content for the 8bit device threaded interrupt handlers.  Depending on the
interrupt line and chip configuration, either click or wakeup / freefall
handler is called.  In case of click, BTN_ event is sent via input device.
 In case of wakeup or freefall, input device ABS_ events are updated
immediatelly.

It is still possible to configure interrupt line 1 for fast freefall
detection and use the second line either for click or threshold based
interrupts.  Or both lines can be used for click / threshold interrupts.

Polled input device can be set to stopped state and still get coordinate
updates via input device using interrupt based method.  Polled mode and
interrupt mode can also be used parallel.

BTN_ events are remapped based on existing axis remapping information.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Acked-by: Eric Piel <eric.piel@tremplin-utc.net>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Samu Onkalo authored and Linus Torvalds committed May 25, 2010
1 parent 92ba4fe commit 6d94d40
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Showing 3 changed files with 88 additions and 13 deletions.
98 changes: 85 additions & 13 deletions drivers/hwmon/lis3lv02d.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -121,11 +121,9 @@ static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
int position[3];
int i;

mutex_lock(&lis3->mutex);
position[0] = lis3->read_data(lis3, OUTX);
position[1] = lis3->read_data(lis3, OUTY);
position[2] = lis3->read_data(lis3, OUTZ);
mutex_unlock(&lis3->mutex);

for (i = 0; i < 3; i++)
position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
Expand Down Expand Up @@ -249,6 +247,19 @@ void lis3lv02d_poweron(struct lis3lv02d *lis3)
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);


static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
{
int x, y, z;

mutex_lock(&lis3_dev.mutex);
lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
input_report_abs(pidev->input, ABS_X, x);
input_report_abs(pidev->input, ABS_Y, y);
input_report_abs(pidev->input, ABS_Z, z);
input_sync(pidev->input);
mutex_unlock(&lis3_dev.mutex);
}

static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
{
if (!test_bit(0, &lis3_dev.misc_opened))
Expand All @@ -270,13 +281,71 @@ static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
return IRQ_HANDLED;
}

static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
{
struct input_dev *dev = lis3->idev->input;
u8 click_src;

mutex_lock(&lis3->mutex);
lis3->read(lis3, CLICK_SRC, &click_src);

if (click_src & CLICK_SINGLE_X) {
input_report_key(dev, lis3->mapped_btns[0], 1);
input_report_key(dev, lis3->mapped_btns[0], 0);
}

if (click_src & CLICK_SINGLE_Y) {
input_report_key(dev, lis3->mapped_btns[1], 1);
input_report_key(dev, lis3->mapped_btns[1], 0);
}

if (click_src & CLICK_SINGLE_Z) {
input_report_key(dev, lis3->mapped_btns[2], 1);
input_report_key(dev, lis3->mapped_btns[2], 0);
}
input_sync(dev);
mutex_unlock(&lis3->mutex);
}

static void lis302dl_interrupt_handle_ff_wu(struct lis3lv02d *lis3)
{
u8 wu1_src;
u8 wu2_src;

lis3->read(lis3, FF_WU_SRC_1, &wu1_src);
lis3->read(lis3, FF_WU_SRC_2, &wu2_src);

wu1_src = wu1_src & FF_WU_SRC_IA ? wu1_src : 0;
wu2_src = wu2_src & FF_WU_SRC_IA ? wu2_src : 0;

/* joystick poll is internally protected by the lis3->mutex. */
if (wu1_src || wu2_src)
lis3lv02d_joystick_poll(lis3_dev.idev);
}

static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
{

struct lis3lv02d *lis3 = data;

if ((lis3->pdata->irq_cfg & LIS3_IRQ1_MASK) == LIS3_IRQ1_CLICK)
lis302dl_interrupt_handle_click(lis3);
else
lis302dl_interrupt_handle_ff_wu(lis3);

return IRQ_HANDLED;
}

static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
{

struct lis3lv02d *lis3 = data;

if ((lis3->pdata->irq_cfg & LIS3_IRQ2_MASK) == LIS3_IRQ2_CLICK)
lis302dl_interrupt_handle_click(lis3);
else
lis302dl_interrupt_handle_ff_wu(lis3);

return IRQ_HANDLED;
}

Expand Down Expand Up @@ -374,22 +443,12 @@ static struct miscdevice lis3lv02d_misc_device = {
.fops = &lis3lv02d_misc_fops,
};

static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
{
int x, y, z;

lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
input_report_abs(pidev->input, ABS_X, x);
input_report_abs(pidev->input, ABS_Y, y);
input_report_abs(pidev->input, ABS_Z, z);
input_sync(pidev->input);
}

int lis3lv02d_joystick_enable(void)
{
struct input_dev *input_dev;
int err;
int max_val, fuzz, flat;
int btns[] = {BTN_X, BTN_Y, BTN_Z};

if (lis3_dev.idev)
return -EINVAL;
Expand All @@ -416,6 +475,10 @@ int lis3lv02d_joystick_enable(void)
input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);

lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);

err = input_register_polled_device(lis3_dev.idev);
if (err) {
input_free_polled_device(lis3_dev.idev);
Expand Down Expand Up @@ -461,7 +524,9 @@ static ssize_t lis3lv02d_position_show(struct device *dev,
{
int x, y, z;

mutex_lock(&lis3_dev.mutex);
lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
mutex_unlock(&lis3_dev.mutex);
return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
}

Expand Down Expand Up @@ -535,6 +600,13 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
dev->write(dev, CLICK_THSY_X,
(p->click_thresh_x & 0xf) |
(p->click_thresh_y << 4));

if (dev->idev) {
struct input_dev *input_dev = lis3_dev.idev->input;
input_set_capability(input_dev, EV_KEY, BTN_X);
input_set_capability(input_dev, EV_KEY, BTN_Y);
input_set_capability(input_dev, EV_KEY, BTN_Z);
}
}

if (p->wakeup_flags) {
Expand Down
1 change: 1 addition & 0 deletions drivers/hwmon/lis3lv02d.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -233,6 +233,7 @@ struct lis3lv02d {
struct platform_device *pdev; /* platform device */
atomic_t count; /* interrupt count after last read */
struct axis_conversion ac; /* hw -> logical axis */
int mapped_btns[3];

u32 irq; /* IRQ number */
struct fasync_struct *async_queue; /* queue for the misc device */
Expand Down
2 changes: 2 additions & 0 deletions include/linux/lis3lv02d.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,12 +25,14 @@ struct lis3lv02d_platform_data {
#define LIS3_IRQ1_FF_WU_12 (3 << 0)
#define LIS3_IRQ1_DATA_READY (4 << 0)
#define LIS3_IRQ1_CLICK (7 << 0)
#define LIS3_IRQ1_MASK (7 << 0)
#define LIS3_IRQ2_DISABLE (0 << 3)
#define LIS3_IRQ2_FF_WU_1 (1 << 3)
#define LIS3_IRQ2_FF_WU_2 (2 << 3)
#define LIS3_IRQ2_FF_WU_12 (3 << 3)
#define LIS3_IRQ2_DATA_READY (4 << 3)
#define LIS3_IRQ2_CLICK (7 << 3)
#define LIS3_IRQ2_MASK (7 << 3)
#define LIS3_IRQ_OPEN_DRAIN (1 << 6)
#define LIS3_IRQ_ACTIVE_LOW (1 << 7)
unsigned char irq_cfg;
Expand Down

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