static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
{
struct rotary_encoder *encoder = dev_id;
int state;
state = rotary_encoder_get_state(encoder->pdata);
switch (state) {
case 0x0:
if (encoder->armed) {
rotary_encoder_report_event(encoder);
encoder->armed = false;
}
break;
case 0x1:
case 0x2:
if (encoder->armed)
encoder->dir = state - 1;
break;
case 0x3:
encoder->armed = true;
break;
}
return IRQ_HANDLED;
}
static void rotary_encoder_irq(void * data)
{
struct input_t * input = (struct input_t *)data;
struct rotary_encoder_pdata_t * pdat = (struct rotary_encoder_pdata_t *)input->priv;
int state = rotary_encoder_get_state(pdat);
switch(state)
{
case 0x0:
if(pdat->state)
{
push_event_rotary_turn(input, pdat->dir ? 1 : -1);
pdat->state = 0;
}
break;
case 0x1:
case 0x2:
if(pdat->state)
pdat->dir = state - 1;
break;
case 0x3:
pdat->state = 1;
break;
default:
break;
}
}
static void rotary_encoder_quarter_period_irq(void * data)
{
struct input_t * input = (struct input_t *)data;
struct rotary_encoder_pdata_t * pdat = (struct rotary_encoder_pdata_t *)input->priv;
int state = rotary_encoder_get_state(pdat);
int sum = ((pdat->state << 4) + state) & 0xff;
pdat->state = state;
switch(sum)
{
case 0x31:
case 0x10:
case 0x02:
case 0x23:
pdat->dir = 0;
break;
case 0x13:
case 0x01:
case 0x20:
case 0x32:
pdat->dir = 1;
break;
default:
return;
}
push_event_rotary_turn(input, pdat->dir ? 1 : -1);
}
static void rotary_encoder_half_period_irq(void * data)
{
struct input_t * input = (struct input_t *)data;
struct rotary_encoder_pdata_t * pdat = (struct rotary_encoder_pdata_t *)input->priv;
int state = rotary_encoder_get_state(pdat);
switch(state)
{
case 0x00:
case 0x03:
if(state != pdat->state)
{
push_event_rotary_turn(input, pdat->dir ? 1 : -1);
pdat->state = state;
}
break;
case 0x01:
case 0x02:
pdat->dir = (pdat->state + state) & 0x01;
break;
default:
break;
}
}
static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
{
struct rotary_encoder *encoder = dev_id;
unsigned int state;
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder);
switch (state) {
case 0x0:
if (encoder->armed) {
rotary_encoder_report_event(encoder);
encoder->armed = false;
}
break;
case 0x1:
case 0x3:
if (encoder->armed)
encoder->dir = 2 - state;
break;
case 0x2:
encoder->armed = true;
break;
}
mutex_unlock(&encoder->access_mutex);
return IRQ_HANDLED;
}
static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
{
struct rotary_encoder *encoder = dev_id;
unsigned int state;
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder);
if (state & 1) {
encoder->dir = ((encoder->last_stable - state + 1) % 4) - 1;
} else {
if (state != encoder->last_stable) {
rotary_encoder_report_event(encoder);
encoder->last_stable = state;
}
}
mutex_unlock(&encoder->access_mutex);
return IRQ_HANDLED;
}
static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
{
struct rotary_encoder *encoder = dev_id;
int state;
state = rotary_encoder_get_state(encoder->pdata);
switch (state) {
case 0x00:
case 0x03:
if (state != encoder->last_stable) {
rotary_encoder_report_event(encoder);
encoder->last_stable = state;
}
break;
case 0x01:
case 0x02:
encoder->dir = (encoder->last_stable + state) & 0x01;
break;
}
return IRQ_HANDLED;
}
static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
{
struct rotary_encoder *encoder = dev_id;
unsigned int state;
mutex_lock(&encoder->access_mutex);
state = rotary_encoder_get_state(encoder);
if ((encoder->last_stable + 1) % 4 == state)
encoder->dir = 1;
else if (encoder->last_stable == (state + 1) % 4)
encoder->dir = -1;
else
goto out;
rotary_encoder_report_event(encoder);
out:
encoder->last_stable = state;
mutex_unlock(&encoder->access_mutex);
return IRQ_HANDLED;
}
static int rotary_encoder_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct rotary_encoder_platform_data *pdata = dev_get_platdata(dev);
struct rotary_encoder *encoder;
struct input_dev *input;
irq_handler_t handler;
int err;
if (!pdata) {
pdata = rotary_encoder_parse_dt(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
if (!pdata) {
dev_err(dev, "missing platform data\n");
return -EINVAL;
}
}
encoder = kzalloc(sizeof(struct rotary_encoder), GFP_KERNEL);
input = input_allocate_device();
if (!encoder || !input) {
err = -ENOMEM;
goto exit_free_mem;
}
encoder->input = input;
encoder->pdata = pdata;
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input->dev.parent = dev;
if (pdata->relative_axis) {
input->evbit[0] = BIT_MASK(EV_REL);
input->relbit[0] = BIT_MASK(pdata->axis);
} else {
input->evbit[0] = BIT_MASK(EV_ABS);
input_set_abs_params(encoder->input,
pdata->axis, 0, pdata->steps, 0, 1);
}
/* request the GPIOs */
err = gpio_request_one(pdata->gpio_a, GPIOF_IN, dev_name(dev));
if (err) {
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_a);
goto exit_free_mem;
}
err = gpio_request_one(pdata->gpio_b, GPIOF_IN, dev_name(dev));
if (err) {
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_b);
goto exit_free_gpio_a;
}
encoder->irq_a = gpio_to_irq(pdata->gpio_a);
encoder->irq_b = gpio_to_irq(pdata->gpio_b);
/* request the IRQs */
if (pdata->half_period) {
handler = &rotary_encoder_half_period_irq;
encoder->last_stable = rotary_encoder_get_state(pdata);
} else {
handler = &rotary_encoder_irq;
}
err = request_irq(encoder->irq_a, handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
DRV_NAME, encoder);
if (err) {
dev_err(dev, "unable to request IRQ %d\n", encoder->irq_a);
goto exit_free_gpio_b;
}
err = request_irq(encoder->irq_b, handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
DRV_NAME, encoder);
if (err) {
dev_err(dev, "unable to request IRQ %d\n", encoder->irq_b);
goto exit_free_irq_a;
}
err = input_register_device(input);
if (err) {
dev_err(dev, "failed to register input device\n");
goto exit_free_irq_b;
}
platform_set_drvdata(pdev, encoder);
return 0;
exit_free_irq_b:
free_irq(encoder->irq_b, encoder);
exit_free_irq_a:
free_irq(encoder->irq_a, encoder);
exit_free_gpio_b:
gpio_free(pdata->gpio_b);
exit_free_gpio_a:
gpio_free(pdata->gpio_a);
exit_free_mem:
input_free_device(input);
kfree(encoder);
if (!dev_get_platdata(&pdev->dev))
kfree(pdata);
return err;
}
static int __devinit rotary_encoder_probe(struct platform_device *pdev)
{
struct rotary_encoder_platform_data *pdata = pdev->dev.platform_data;
struct rotary_encoder *encoder;
struct input_dev *input;
irq_handler_t handler;
int err;
if (!pdata) {
dev_err(&pdev->dev, "missing platform data\n");
return -ENOENT;
}
encoder = kzalloc(sizeof(struct rotary_encoder), GFP_KERNEL);
input = input_allocate_device();
if (!encoder || !input) {
dev_err(&pdev->dev, "failed to allocate memory for device\n");
err = -ENOMEM;
goto exit_free_mem;
}
encoder->input = input;
encoder->pdata = pdata;
encoder->irq_a = gpio_to_irq(pdata->gpio_a);
encoder->irq_b = gpio_to_irq(pdata->gpio_b);
/* */
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input->dev.parent = &pdev->dev;
if (pdata->relative_axis) {
input->evbit[0] = BIT_MASK(EV_REL);
input->relbit[0] = BIT_MASK(pdata->axis);
} else {
input->evbit[0] = BIT_MASK(EV_ABS);
input_set_abs_params(encoder->input,
pdata->axis, 0, pdata->steps, 0, 1);
}
err = input_register_device(input);
if (err) {
dev_err(&pdev->dev, "failed to register input device\n");
goto exit_free_mem;
}
/* */
err = gpio_request(pdata->gpio_a, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "unable to request GPIO %d\n",
pdata->gpio_a);
goto exit_unregister_input;
}
err = gpio_direction_input(pdata->gpio_a);
if (err) {
dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
pdata->gpio_a);
goto exit_unregister_input;
}
err = gpio_request(pdata->gpio_b, DRV_NAME);
if (err) {
dev_err(&pdev->dev, "unable to request GPIO %d\n",
pdata->gpio_b);
goto exit_free_gpio_a;
}
err = gpio_direction_input(pdata->gpio_b);
if (err) {
dev_err(&pdev->dev, "unable to set GPIO %d for input\n",
pdata->gpio_b);
goto exit_free_gpio_a;
}
/* */
if (pdata->half_period) {
handler = &rotary_encoder_half_period_irq;
encoder->last_stable = rotary_encoder_get_state(pdata);
} else {
handler = &rotary_encoder_irq;
}
err = request_irq(encoder->irq_a, handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
DRV_NAME, encoder);
if (err) {
dev_err(&pdev->dev, "unable to request IRQ %d\n",
encoder->irq_a);
goto exit_free_gpio_b;
}
err = request_irq(encoder->irq_b, handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
DRV_NAME, encoder);
if (err) {
dev_err(&pdev->dev, "unable to request IRQ %d\n",
encoder->irq_b);
goto exit_free_irq_a;
}
platform_set_drvdata(pdev, encoder);
return 0;
exit_free_irq_a:
free_irq(encoder->irq_a, encoder);
exit_free_gpio_b:
gpio_free(pdata->gpio_b);
exit_free_gpio_a:
gpio_free(pdata->gpio_a);
exit_unregister_input:
input_unregister_device(input);
input = NULL; /* */
exit_free_mem:
input_free_device(input);
kfree(encoder);
return err;
}
static struct device_t * rotary_encoder_probe(struct driver_t * drv, struct dtnode_t * n)
{
struct rotary_encoder_pdata_t * pdat;
struct input_t * input;
struct device_t * dev;
int a = dt_read_int(n, "a-gpio", -1);
int b = dt_read_int(n, "b-gpio", -1);
if(!gpio_is_valid(a) || !gpio_is_valid(b)
|| !irq_is_valid(gpio_to_irq(a))
|| !irq_is_valid(gpio_to_irq(b)))
return NULL;
pdat = malloc(sizeof(struct rotary_encoder_pdata_t));
if(!pdat)
return NULL;
input = malloc(sizeof(struct input_t));
if(!input)
{
free(pdat);
return NULL;
}
pdat->a = a;
pdat->acfg = dt_read_int(n, "a-gpio-config", -1);
pdat->b = b;
pdat->bcfg = dt_read_int(n, "b-gpio-config", -1);
pdat->c = dt_read_int(n, "c-gpio", -1);
pdat->ccfg = dt_read_int(n, "c-gpio-config", -1);
pdat->irqa = gpio_to_irq(pdat->a);
pdat->irqb = gpio_to_irq(pdat->b);
pdat->irqc = gpio_to_irq(pdat->c);
pdat->inva = dt_read_bool(n, "a-inverted", 0);
pdat->invb = dt_read_bool(n, "b-inverted", 0);
pdat->invc = dt_read_bool(n, "c-inverted", 0);
input->name = alloc_device_name(dt_read_name(n), dt_read_id(n));
input->ioctl = rotary_encoder_ioctl;
input->priv = pdat;
if(pdat->acfg >= 0)
gpio_set_cfg(pdat->a, pdat->acfg);
gpio_set_pull(pdat->a, pdat->inva ? GPIO_PULL_DOWN : GPIO_PULL_UP);
gpio_direction_input(pdat->a);
if(pdat->bcfg >= 0)
gpio_set_cfg(pdat->b, pdat->bcfg);
gpio_set_pull(pdat->b, pdat->invb ? GPIO_PULL_DOWN : GPIO_PULL_UP);
gpio_direction_input(pdat->b);
switch(dt_read_int(n, "step-per-period", 1))
{
case 4:
request_irq(pdat->irqa, rotary_encoder_quarter_period_irq, IRQ_TYPE_EDGE_BOTH, input);
request_irq(pdat->irqb, rotary_encoder_quarter_period_irq, IRQ_TYPE_EDGE_BOTH, input);
pdat->state = rotary_encoder_get_state(pdat);
break;
case 2:
request_irq(pdat->irqa, rotary_encoder_half_period_irq, IRQ_TYPE_EDGE_BOTH, input);
request_irq(pdat->irqb, rotary_encoder_half_period_irq, IRQ_TYPE_EDGE_BOTH, input);
pdat->state = rotary_encoder_get_state(pdat);
break;
case 1:
request_irq(pdat->irqa, rotary_encoder_irq, IRQ_TYPE_EDGE_BOTH, input);
request_irq(pdat->irqb, rotary_encoder_irq, IRQ_TYPE_EDGE_BOTH, input);
pdat->state = 0;
break;
default:
request_irq(pdat->irqa, rotary_encoder_irq, IRQ_TYPE_EDGE_BOTH, input);
request_irq(pdat->irqb, rotary_encoder_irq, IRQ_TYPE_EDGE_BOTH, input);
pdat->state = 0;
break;
}
if(gpio_is_valid(pdat->c) && irq_is_valid(pdat->irqc))
{
if(pdat->ccfg >= 0)
gpio_set_cfg(pdat->c, pdat->ccfg);
gpio_set_pull(pdat->c, pdat->invc ? GPIO_PULL_DOWN : GPIO_PULL_UP);
gpio_direction_input(pdat->c);
request_irq(pdat->irqc, rotary_encoder_c_irq, IRQ_TYPE_EDGE_BOTH, input);
}
if(!register_input(&dev, input))
{
free_irq(pdat->irqa);
free_irq(pdat->irqb);
if(gpio_is_valid(pdat->c) && irq_is_valid(pdat->irqc))
free_irq(pdat->irqc);
free_device_name(input->name);
free(input->priv);
free(input);
return NULL;
}
dev->driver = drv;
return dev;
}
static int rotary_encoder_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rotary_encoder *encoder;
struct input_dev *input;
irq_handler_t handler;
u32 steps_per_period;
unsigned int i;
int err;
encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);
if (!encoder)
return -ENOMEM;
mutex_init(&encoder->access_mutex);
device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);
err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",
&steps_per_period);
if (err) {
/*
* The 'half-period' property has been deprecated, you must
* use 'steps-per-period' and set an appropriate value, but
* we still need to parse it to maintain compatibility. If
* neither property is present we fall back to the one step
* per period behavior.
*/
steps_per_period = device_property_read_bool(dev,
"rotary-encoder,half-period") ? 2 : 1;
}
encoder->rollover =
device_property_read_bool(dev, "rotary-encoder,rollover");
if (!device_property_present(dev, "rotary-encoder,encoding") ||
!device_property_match_string(dev, "rotary-encoder,encoding",
"gray")) {
dev_info(dev, "gray");
encoder->encoding = ROTENC_GRAY;
} else if (!device_property_match_string(dev, "rotary-encoder,encoding",
"binary")) {
dev_info(dev, "binary");
encoder->encoding = ROTENC_BINARY;
} else {
dev_err(dev, "unknown encoding setting\n");
return -EINVAL;
}
device_property_read_u32(dev, "linux,axis", &encoder->axis);
encoder->relative_axis =
device_property_read_bool(dev, "rotary-encoder,relative-axis");
encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN);
if (IS_ERR(encoder->gpios)) {
dev_err(dev, "unable to get gpios\n");
return PTR_ERR(encoder->gpios);
}
if (encoder->gpios->ndescs < 2) {
dev_err(dev, "not enough gpios found\n");
return -EINVAL;
}
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
encoder->input = input;
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input->dev.parent = dev;
if (encoder->relative_axis)
input_set_capability(input, EV_REL, encoder->axis);
else
input_set_abs_params(input,
encoder->axis, 0, encoder->steps, 0, 1);
switch (steps_per_period >> (encoder->gpios->ndescs - 2)) {
case 4:
handler = &rotary_encoder_quarter_period_irq;
encoder->last_stable = rotary_encoder_get_state(encoder);
break;
case 2:
handler = &rotary_encoder_half_period_irq;
encoder->last_stable = rotary_encoder_get_state(encoder);
break;
case 1:
handler = &rotary_encoder_irq;
break;
default:
dev_err(dev, "'%d' is not a valid steps-per-period value\n",
steps_per_period);
return -EINVAL;
}
encoder->irq =
devm_kcalloc(dev,
encoder->gpios->ndescs, sizeof(*encoder->irq),
GFP_KERNEL);
if (!encoder->irq)
return -ENOMEM;
for (i = 0; i < encoder->gpios->ndescs; ++i) {
encoder->irq[i] = gpiod_to_irq(encoder->gpios->desc[i]);
err = devm_request_threaded_irq(dev, encoder->irq[i],
NULL, handler,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
DRV_NAME, encoder);
if (err) {
dev_err(dev, "unable to request IRQ %d (gpio#%d)\n",
encoder->irq[i], i);
return err;
}
}
err = input_register_device(input);
if (err) {
dev_err(dev, "failed to register input device\n");
return err;
}
device_init_wakeup(dev,
device_property_read_bool(dev, "wakeup-source"));
platform_set_drvdata(pdev, encoder);
return 0;
}