Lines Matching +full:invert +full:- +full:interrupt
16 * an interrupt pin. Like so:
19 * input +------>-------|+ \
21 * .-------. | }---.
23 * | dac|-->--|- / |
27 * | irq|------<-------'
29 * '-------'
41 #include <linux/interrupt.h>
63 bool invert; member
75 * interrupt service routine below (envelope_detector_comp_isr) as a latch
76 * (one-bit memory) for if the interrupt has triggered since last calling
78 * The ..._comp_isr function disables the interrupt so that the cpu does not
79 * need to service a possible interrupt flood from the comparator when no-one
87 spin_lock_irq(&env->comp_lock); in envelope_detector_comp_latch()
88 comp = env->comp; in envelope_detector_comp_latch()
89 env->comp = 0; in envelope_detector_comp_latch()
90 spin_unlock_irq(&env->comp_lock); in envelope_detector_comp_latch()
102 enable_irq(env->comp_irq); in envelope_detector_comp_latch()
105 synchronize_irq(env->comp_irq); in envelope_detector_comp_latch()
108 spin_lock_irq(&env->comp_lock); in envelope_detector_comp_latch()
109 comp = env->comp; in envelope_detector_comp_latch()
110 env->comp = 0; in envelope_detector_comp_latch()
111 spin_unlock_irq(&env->comp_lock); in envelope_detector_comp_latch()
114 enable_irq(env->comp_irq); in envelope_detector_comp_latch()
123 spin_lock(&env->comp_lock); in envelope_detector_comp_isr()
124 env->comp = 1; in envelope_detector_comp_isr()
125 disable_irq_nosync(env->comp_irq); in envelope_detector_comp_isr()
126 spin_unlock(&env->comp_lock); in envelope_detector_comp_isr()
139 * When invert is active, use the midpoint floor so that in envelope_detector_setup_compare()
140 * env->level ends up as env->low when the termination in envelope_detector_setup_compare()
142 * ceiling when invert is not active so that env->level in envelope_detector_setup_compare()
143 * ends up as env->high in that case. in envelope_detector_setup_compare()
145 env->level = (env->high + env->low + !env->invert) / 2; in envelope_detector_setup_compare()
147 if (env->high == env->low + 1) { in envelope_detector_setup_compare()
148 complete(&env->done); in envelope_detector_setup_compare()
153 ret = iio_write_channel_raw(env->dac, env->invert ? 0 : env->dac_max); in envelope_detector_setup_compare()
161 ret = iio_write_channel_raw(env->dac, env->level); in envelope_detector_setup_compare()
166 schedule_delayed_work(&env->comp_timeout, in envelope_detector_setup_compare()
167 msecs_to_jiffies(env->comp_interval)); in envelope_detector_setup_compare()
171 env->level = ret; in envelope_detector_setup_compare()
172 complete(&env->done); in envelope_detector_setup_compare()
181 if (!envelope_detector_comp_latch(env) ^ !env->invert) in envelope_detector_timeout()
182 env->low = env->level; in envelope_detector_timeout()
184 env->high = env->level; in envelope_detector_timeout()
200 * When invert is active, start with high=max+1 and low=0 in envelope_detector_read_raw()
203 * start with high=max and low=-1 when invert is not active in envelope_detector_read_raw()
209 mutex_lock(&env->read_lock); in envelope_detector_read_raw()
210 env->high = env->dac_max + env->invert; in envelope_detector_read_raw()
211 env->low = -1 + env->invert; in envelope_detector_read_raw()
213 wait_for_completion(&env->done); in envelope_detector_read_raw()
214 if (env->level < 0) { in envelope_detector_read_raw()
215 ret = env->level; in envelope_detector_read_raw()
218 *val = env->invert ? env->dac_max - env->level : env->level; in envelope_detector_read_raw()
219 mutex_unlock(&env->read_lock); in envelope_detector_read_raw()
224 return iio_read_channel_scale(env->dac, val, val2); in envelope_detector_read_raw()
227 return -EINVAL; in envelope_detector_read_raw()
230 mutex_unlock(&env->read_lock); in envelope_detector_read_raw()
240 return sprintf(buf, "%u\n", env->invert); in envelope_show_invert()
249 unsigned long invert; in envelope_store_invert() local
253 ret = kstrtoul(buf, 0, &invert); in envelope_store_invert()
256 if (invert > 1) in envelope_store_invert()
257 return -EINVAL; in envelope_store_invert()
259 trigger = invert ? env->comp_irq_trigger_inv : env->comp_irq_trigger; in envelope_store_invert()
261 mutex_lock(&env->read_lock); in envelope_store_invert()
262 if (invert != env->invert) in envelope_store_invert()
263 ret = irq_set_irq_type(env->comp_irq, trigger); in envelope_store_invert()
265 env->invert = invert; in envelope_store_invert()
268 mutex_unlock(&env->read_lock); in envelope_store_invert()
280 return sprintf(buf, "%u\n", env->comp_interval); in envelope_show_comp_interval()
296 return -EINVAL; in envelope_store_comp_interval()
298 mutex_lock(&env->read_lock); in envelope_store_comp_interval()
299 env->comp_interval = interval; in envelope_store_comp_interval()
300 mutex_unlock(&env->read_lock); in envelope_store_comp_interval()
306 { .name = "invert",
329 struct device *dev = &pdev->dev; in envelope_detector_probe()
337 return -ENOMEM; in envelope_detector_probe()
341 env->comp_interval = 50; /* some sensible default? */ in envelope_detector_probe()
343 spin_lock_init(&env->comp_lock); in envelope_detector_probe()
344 mutex_init(&env->read_lock); in envelope_detector_probe()
345 init_completion(&env->done); in envelope_detector_probe()
346 INIT_DELAYED_WORK(&env->comp_timeout, envelope_detector_timeout); in envelope_detector_probe()
348 indio_dev->name = dev_name(dev); in envelope_detector_probe()
349 indio_dev->dev.parent = dev; in envelope_detector_probe()
350 indio_dev->dev.of_node = dev->of_node; in envelope_detector_probe()
351 indio_dev->info = &envelope_detector_info; in envelope_detector_probe()
352 indio_dev->channels = &envelope_detector_iio_channel; in envelope_detector_probe()
353 indio_dev->num_channels = 1; in envelope_detector_probe()
355 env->dac = devm_iio_channel_get(dev, "dac"); in envelope_detector_probe()
356 if (IS_ERR(env->dac)) { in envelope_detector_probe()
357 if (PTR_ERR(env->dac) != -EPROBE_DEFER) in envelope_detector_probe()
359 return PTR_ERR(env->dac); in envelope_detector_probe()
362 env->comp_irq = platform_get_irq_byname(pdev, "comp"); in envelope_detector_probe()
363 if (env->comp_irq < 0) { in envelope_detector_probe()
364 if (env->comp_irq != -EPROBE_DEFER) in envelope_detector_probe()
365 dev_err(dev, "failed to get compare interrupt\n"); in envelope_detector_probe()
366 return env->comp_irq; in envelope_detector_probe()
369 ret = devm_request_irq(dev, env->comp_irq, envelope_detector_comp_isr, in envelope_detector_probe()
370 0, "envelope-detector", env); in envelope_detector_probe()
372 if (ret != -EPROBE_DEFER) in envelope_detector_probe()
373 dev_err(dev, "failed to request interrupt\n"); in envelope_detector_probe()
376 env->comp_irq_trigger = irq_get_trigger_type(env->comp_irq); in envelope_detector_probe()
377 if (env->comp_irq_trigger & IRQF_TRIGGER_RISING) in envelope_detector_probe()
378 env->comp_irq_trigger_inv |= IRQF_TRIGGER_FALLING; in envelope_detector_probe()
379 if (env->comp_irq_trigger & IRQF_TRIGGER_FALLING) in envelope_detector_probe()
380 env->comp_irq_trigger_inv |= IRQF_TRIGGER_RISING; in envelope_detector_probe()
381 if (env->comp_irq_trigger & IRQF_TRIGGER_HIGH) in envelope_detector_probe()
382 env->comp_irq_trigger_inv |= IRQF_TRIGGER_LOW; in envelope_detector_probe()
383 if (env->comp_irq_trigger & IRQF_TRIGGER_LOW) in envelope_detector_probe()
384 env->comp_irq_trigger_inv |= IRQF_TRIGGER_HIGH; in envelope_detector_probe()
386 ret = iio_get_channel_type(env->dac, &type); in envelope_detector_probe()
392 return -EINVAL; in envelope_detector_probe()
395 ret = iio_read_max_channel_raw(env->dac, &env->dac_max); in envelope_detector_probe()
405 { .compatible = "axentia,tse850-envelope-detector", },
413 .name = "iio-envelope-detector",