Lines Matching +full:pullup +full:- +full:ohm
28 #include <linux/mfd/mxs-lradc.h>
34 "mxs-lradc-touchscreen",
35 "mxs-lradc-channel6",
36 "mxs-lradc-channel7",
102 return !!(readl(ts->base + LRADC_STATUS) & in mxs_lradc_check_touch_event()
110 ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_CLR); in mxs_lradc_map_ts_channel()
112 ts->base + LRADC_CTRL4 + STMP_OFFSET_REG_SET); in mxs_lradc_map_ts_channel()
126 LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1), in mxs_lradc_setup_ts_channel()
127 ts->base + LRADC_CH(ch)); in mxs_lradc_setup_ts_channel()
131 * multi-cycle accumulation. in mxs_lradc_setup_ts_channel()
134 ts->base + LRADC_CH(ch) + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_ts_channel()
141 * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise, in mxs_lradc_setup_ts_channel()
145 LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) | in mxs_lradc_setup_ts_channel()
146 LRADC_DELAY_DELAY(ts->over_sample_delay - 1), in mxs_lradc_setup_ts_channel()
147 ts->base + LRADC_DELAY(3)); in mxs_lradc_setup_ts_channel()
150 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_ts_channel()
159 LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay), in mxs_lradc_setup_ts_channel()
160 ts->base + LRADC_DELAY(2)); in mxs_lradc_setup_ts_channel()
183 LRADC_CH_NUM_SAMPLES(ts->over_sample_cnt - 1); in mxs_lradc_setup_ts_pressure()
184 writel(reg, ts->base + LRADC_CH(ch1)); in mxs_lradc_setup_ts_pressure()
185 writel(reg, ts->base + LRADC_CH(ch2)); in mxs_lradc_setup_ts_pressure()
189 * multi-cycle accumulation. in mxs_lradc_setup_ts_pressure()
192 ts->base + LRADC_CH(ch1) + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_ts_pressure()
194 ts->base + LRADC_CH(ch2) + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_ts_pressure()
199 LRADC_DELAY_LOOP(ts->over_sample_cnt - 1) | in mxs_lradc_setup_ts_pressure()
200 LRADC_DELAY_DELAY(ts->over_sample_delay - 1), in mxs_lradc_setup_ts_pressure()
201 ts->base + LRADC_DELAY(3)); in mxs_lradc_setup_ts_pressure()
204 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_ts_pressure()
213 LRADC_DELAY_KICK | LRADC_DELAY_DELAY(ts->settling_delay), in mxs_lradc_setup_ts_pressure()
214 ts->base + LRADC_DELAY(2)); in mxs_lradc_setup_ts_pressure()
223 reg = readl(ts->base + LRADC_CH(channel)); in mxs_lradc_ts_read_raw_channel()
225 num_samples = ts->over_sample_cnt; in mxs_lradc_ts_read_raw_channel()
240 reg = readl(ts->base + LRADC_CTRL1) & mask; in mxs_lradc_read_ts_pressure()
243 reg = readl(ts->base + LRADC_CTRL1) & mask; in mxs_lradc_read_ts_pressure()
244 dev_dbg(ts->dev, "One channel is still busy: %X\n", reg); in mxs_lradc_read_ts_pressure()
251 dev_warn(ts->dev, "Cannot calculate pressure\n"); in mxs_lradc_read_ts_pressure()
252 return 1 << (LRADC_RESOLUTION - 1); in mxs_lradc_read_ts_pressure()
260 dev_dbg(ts->dev, "Pressure = %u\n", pressure); in mxs_lradc_read_ts_pressure()
270 * YP(open)--+-------------+
271 * | |--+
273 * YM(-)--+-------------+ |
274 * +--------------+
278 * "weak+" means 200k Ohm VDDIO
279 * (-) means GND
283 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_setup_touch_detection()
288 * - a weak pullup to the X+ connector in mxs_lradc_setup_touch_detection()
289 * - a strong ground at the Y- connector in mxs_lradc_setup_touch_detection()
291 writel(info[lradc->soc].mask, in mxs_lradc_setup_touch_detection()
292 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_setup_touch_detection()
293 writel(info[lradc->soc].bit, in mxs_lradc_setup_touch_detection()
294 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); in mxs_lradc_setup_touch_detection()
298 * YP(meas)--+-------------+
299 * | |--+
301 * YM(open)--+-------------+ |
302 * +--------------+
304 * XP(+) XM(-)
307 * (-) means here GND
311 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_prepare_x_pos()
313 writel(info[lradc->soc].mask, in mxs_lradc_prepare_x_pos()
314 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_prepare_x_pos()
315 writel(info[lradc->soc].x_plate, in mxs_lradc_prepare_x_pos()
316 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); in mxs_lradc_prepare_x_pos()
318 ts->cur_plate = LRADC_SAMPLE_X; in mxs_lradc_prepare_x_pos()
324 * YP(+)--+-------------+
325 * | |--+
327 * YM(-)--+-------------+ |
328 * +--------------+
333 * (-) means here GND
337 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_prepare_y_pos()
339 writel(info[lradc->soc].mask, in mxs_lradc_prepare_y_pos()
340 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_prepare_y_pos()
341 writel(info[lradc->soc].y_plate, in mxs_lradc_prepare_y_pos()
342 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); in mxs_lradc_prepare_y_pos()
344 ts->cur_plate = LRADC_SAMPLE_Y; in mxs_lradc_prepare_y_pos()
350 * YP(+)--+-------------+
351 * | |--+
353 * YM(meas)--+-------------+ |
354 * +--------------+
356 * XP(meas) XM(-)
359 * (-) means here GND
363 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_prepare_pressure()
365 writel(info[lradc->soc].mask, in mxs_lradc_prepare_pressure()
366 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_prepare_pressure()
367 writel(info[lradc->soc].pressure, in mxs_lradc_prepare_pressure()
368 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); in mxs_lradc_prepare_pressure()
370 ts->cur_plate = LRADC_SAMPLE_PRESSURE; in mxs_lradc_prepare_pressure()
381 ts->cur_plate = LRADC_TOUCH; in mxs_lradc_enable_touch_detection()
383 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_enable_touch_detection()
385 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); in mxs_lradc_enable_touch_detection()
391 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_start_touch_event()
393 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); in mxs_lradc_start_touch_event()
395 * start with the Y-pos, because it uses nearly the same plate in mxs_lradc_start_touch_event()
403 input_report_abs(ts->ts_input, ABS_X, ts->ts_x_pos); in mxs_lradc_report_ts_event()
404 input_report_abs(ts->ts_input, ABS_Y, ts->ts_y_pos); in mxs_lradc_report_ts_event()
405 input_report_abs(ts->ts_input, ABS_PRESSURE, ts->ts_pressure); in mxs_lradc_report_ts_event()
406 input_report_key(ts->ts_input, BTN_TOUCH, 1); in mxs_lradc_report_ts_event()
407 input_sync(ts->ts_input); in mxs_lradc_report_ts_event()
413 ts->cur_plate = LRADC_SAMPLE_VALID; in mxs_lradc_complete_touch_event()
418 writel(0, ts->base + LRADC_CH(TOUCHSCREEN_VCHANNEL1)); in mxs_lradc_complete_touch_event()
421 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_complete_touch_event()
424 ts->base + LRADC_DELAY(2)); in mxs_lradc_complete_touch_event()
435 ts->ts_valid = true; in mxs_lradc_finish_touch_event()
445 if (ts->ts_valid) { in mxs_lradc_finish_touch_event()
447 ts->ts_valid = false; in mxs_lradc_finish_touch_event()
448 input_report_key(ts->ts_input, BTN_TOUCH, 0); in mxs_lradc_finish_touch_event()
449 input_sync(ts->ts_input); in mxs_lradc_finish_touch_event()
453 ts->cur_plate = LRADC_TOUCH; in mxs_lradc_finish_touch_event()
454 writel(0, ts->base + LRADC_DELAY(2)); in mxs_lradc_finish_touch_event()
455 writel(0, ts->base + LRADC_DELAY(3)); in mxs_lradc_finish_touch_event()
459 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_finish_touch_event()
461 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_SET); in mxs_lradc_finish_touch_event()
467 switch (ts->cur_plate) { in mxs_lradc_handle_touch()
472 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_handle_touch()
476 ts->ts_y_pos = in mxs_lradc_handle_touch()
482 ts->ts_x_pos = in mxs_lradc_handle_touch()
488 ts->ts_pressure = in mxs_lradc_handle_touch()
505 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_ts_handle_irq()
506 unsigned long reg = readl(ts->base + LRADC_CTRL1); in mxs_lradc_ts_handle_irq()
518 spin_lock_irqsave(&ts->lock, flags); in mxs_lradc_ts_handle_irq()
520 spin_unlock_irqrestore(&ts->lock, flags); in mxs_lradc_ts_handle_irq()
525 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_ts_handle_irq()
535 /* Enable the touch-detect circuitry. */ in mxs_lradc_ts_open()
544 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_ts_stop()
550 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_ts_stop()
552 /* Power-down touchscreen touch-detect circuitry. */ in mxs_lradc_ts_stop()
553 writel(info[lradc->soc].mask, in mxs_lradc_ts_stop()
554 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_ts_stop()
556 writel(lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET, in mxs_lradc_ts_stop()
557 ts->base + LRADC_CTRL1 + STMP_OFFSET_REG_CLR); in mxs_lradc_ts_stop()
560 writel(0, ts->base + LRADC_DELAY(i)); in mxs_lradc_ts_stop()
572 struct mxs_lradc *lradc = ts->lradc; in mxs_lradc_ts_hw_init()
575 if (lradc->soc == IMX28_LRADC) { in mxs_lradc_ts_hw_init()
577 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_CLR); in mxs_lradc_ts_hw_init()
579 if (lradc->touchscreen_wire == MXS_LRADC_TOUCHSCREEN_5WIRE) in mxs_lradc_ts_hw_init()
581 ts->base + LRADC_CTRL0 + STMP_OFFSET_REG_SET); in mxs_lradc_ts_hw_init()
588 struct device *dev = ts->dev; in mxs_lradc_ts_register()
592 return -ENOMEM; in mxs_lradc_ts_register()
594 input->name = "mxs-lradc-ts"; in mxs_lradc_ts_register()
595 input->id.bustype = BUS_HOST; in mxs_lradc_ts_register()
596 input->open = mxs_lradc_ts_open; in mxs_lradc_ts_register()
597 input->close = mxs_lradc_ts_close; in mxs_lradc_ts_register()
599 __set_bit(INPUT_PROP_DIRECT, input->propbit); in mxs_lradc_ts_register()
606 ts->ts_input = input; in mxs_lradc_ts_register()
614 struct device *dev = &pdev->dev; in mxs_lradc_ts_probe()
615 struct device_node *node = dev->parent->of_node; in mxs_lradc_ts_probe()
616 struct mxs_lradc *lradc = dev_get_drvdata(dev->parent); in mxs_lradc_ts_probe()
624 return -ENOMEM; in mxs_lradc_ts_probe()
628 ts->lradc = lradc; in mxs_lradc_ts_probe()
629 ts->dev = dev; in mxs_lradc_ts_probe()
630 spin_lock_init(&ts->lock); in mxs_lradc_ts_probe()
634 return -EINVAL; in mxs_lradc_ts_probe()
635 ts->base = devm_ioremap(dev, iores->start, resource_size(iores)); in mxs_lradc_ts_probe()
636 if (!ts->base) in mxs_lradc_ts_probe()
637 return -ENOMEM; in mxs_lradc_ts_probe()
639 ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires", in mxs_lradc_ts_probe()
644 if (of_property_read_u32(node, "fsl,ave-ctrl", &adapt)) { in mxs_lradc_ts_probe()
645 ts->over_sample_cnt = 4; in mxs_lradc_ts_probe()
648 ts->over_sample_cnt = adapt; in mxs_lradc_ts_probe()
650 dev_err(ts->dev, "Invalid sample count (%u)\n", in mxs_lradc_ts_probe()
652 return -EINVAL; in mxs_lradc_ts_probe()
656 if (of_property_read_u32(node, "fsl,ave-delay", &adapt)) { in mxs_lradc_ts_probe()
657 ts->over_sample_delay = 2; in mxs_lradc_ts_probe()
660 ts->over_sample_delay = adapt; in mxs_lradc_ts_probe()
662 dev_err(ts->dev, "Invalid sample delay (%u)\n", in mxs_lradc_ts_probe()
664 return -EINVAL; in mxs_lradc_ts_probe()
669 ts->settling_delay = 10; in mxs_lradc_ts_probe()
672 ts->settling_delay = adapt; in mxs_lradc_ts_probe()
674 dev_err(ts->dev, "Invalid settling delay (%u)\n", in mxs_lradc_ts_probe()
676 return -EINVAL; in mxs_lradc_ts_probe()
680 ret = stmp_reset_block(ts->base); in mxs_lradc_ts_probe()
707 .name = "mxs-lradc-ts",
716 MODULE_ALIAS("platform:mxs-lradc-ts");