3  * TWL6030 GPADC module driver
86  * struct twl6030_ideal_code - GPADC calibration parameters
87  * GPADC is calibrated in two points: close to the beginning and
108  * @nchannels:		number of GPADC channels
122 	int (*calibrate)(struct twl6030_gpadc_data *gpadc);
126  * struct twl6030_gpadc_data - GPADC data
385 	struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);  in twl6030_gpadc_irq_handler()  local
387 	complete(&gpadc->irq_complete);  in twl6030_gpadc_irq_handler()
448 static int twl6030_gpadc_make_correction(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_make_correction()  argument
451 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_gpadc_make_correction()
455 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_gpadc_make_correction()
457 		gpadc->twl6030_cal_tbl[i].offset_error) /  in twl6030_gpadc_make_correction()
458 		gpadc->twl6030_cal_tbl[i].gain_error;  in twl6030_gpadc_make_correction()
463 static int twl6030_gpadc_get_raw(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_get_raw()  argument
466 	u8 reg = gpadc->pdata->channel_to_reg(channel);  in twl6030_gpadc_get_raw()
473 		dev_dbg(gpadc->dev, "unable to read register 0x%X\n", reg);  in twl6030_gpadc_get_raw()
478 	dev_dbg(gpadc->dev, "GPADC raw code: %d", raw_code);  in twl6030_gpadc_get_raw()
480 	if (twl6030_channel_calibrated(gpadc->pdata, channel))  in twl6030_gpadc_get_raw()
481 		*res = twl6030_gpadc_make_correction(gpadc, channel, raw_code);  in twl6030_gpadc_get_raw()
488 static int twl6030_gpadc_get_processed(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_get_processed()  argument
491 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_gpadc_get_processed()
497 	ret = twl6030_gpadc_get_raw(gpadc, channel, &corrected_code);  in twl6030_gpadc_get_processed()
501 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_gpadc_get_processed()
503 			gpadc->twl6030_cal_tbl[i].gain;  in twl6030_gpadc_get_processed()
508 	dev_dbg(gpadc->dev, "GPADC corrected code: %d", corrected_code);  in twl6030_gpadc_get_processed()
509 	dev_dbg(gpadc->dev, "GPADC value: %d", channel_value);  in twl6030_gpadc_get_processed()
520 	struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);  in twl6030_gpadc_read_raw()  local
524 	mutex_lock(&gpadc->lock);  in twl6030_gpadc_read_raw()
526 	ret = gpadc->pdata->start_conversion(chan->channel);  in twl6030_gpadc_read_raw()
528 		dev_err(gpadc->dev, "failed to start conversion\n");  in twl6030_gpadc_read_raw()
533 				&gpadc->irq_complete, msecs_to_jiffies(5000));  in twl6030_gpadc_read_raw()
544 		ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val);  in twl6030_gpadc_read_raw()
549 		ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val);  in twl6030_gpadc_read_raw()
557 	mutex_unlock(&gpadc->lock);  in twl6030_gpadc_read_raw()
563  * The GPADC channels are calibrated using a two point calibration method.
573 static void twl6030_calibrate_channel(struct twl6030_gpadc_data *gpadc,  in twl6030_calibrate_channel()  argument
577 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_calibrate_channel()
579 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_calibrate_channel()
594 	gpadc->twl6030_cal_tbl[i].gain = gain;  in twl6030_calibrate_channel()
595 	gpadc->twl6030_cal_tbl[i].gain_error = k;  in twl6030_calibrate_channel()
596 	gpadc->twl6030_cal_tbl[i].offset_error = b;  in twl6030_calibrate_channel()
598 	dev_dbg(gpadc->dev, "GPADC d1   for Chn: %d = %d\n", channel, d1);  in twl6030_calibrate_channel()
599 	dev_dbg(gpadc->dev, "GPADC d2   for Chn: %d = %d\n", channel, d2);  in twl6030_calibrate_channel()
600 	dev_dbg(gpadc->dev, "GPADC x1   for Chn: %d = %d\n", channel, x1);  in twl6030_calibrate_channel()
601 	dev_dbg(gpadc->dev, "GPADC x2   for Chn: %d = %d\n", channel, x2);  in twl6030_calibrate_channel()
602 	dev_dbg(gpadc->dev, "GPADC Gain for Chn: %d = %d\n", channel, gain);  in twl6030_calibrate_channel()
603 	dev_dbg(gpadc->dev, "GPADC k    for Chn: %d = %d\n", channel, k);  in twl6030_calibrate_channel()
604 	dev_dbg(gpadc->dev, "GPADC b    for Chn: %d = %d\n", channel, b);  in twl6030_calibrate_channel()
621 static int twl6030_calibration(struct twl6030_gpadc_data *gpadc)  in twl6030_calibration()  argument
638 		dev_err(gpadc->dev, "calibration failed\n");  in twl6030_calibration()
688 		twl6030_calibrate_channel(gpadc, chn, d1, d2);  in twl6030_calibration()
708 static int twl6032_calibration(struct twl6030_gpadc_data *gpadc)  in twl6032_calibration()  argument
717 		dev_err(gpadc->dev, "calibration failed\n");  in twl6032_calibration()
723 	 * GPADC not values.  in twl6032_calibration()
796 		twl6030_calibrate_channel(gpadc, chn, d1, d2);  in twl6032_calibration()
867 		.compatible = "ti,twl6030-gpadc",
871 		.compatible = "ti,twl6032-gpadc",
881 	struct twl6030_gpadc_data *gpadc;  in twl6030_gpadc_probe()  local
891 	indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));  in twl6030_gpadc_probe()
895 	gpadc = iio_priv(indio_dev);  in twl6030_gpadc_probe()
897 	gpadc->twl6030_cal_tbl = devm_kcalloc(dev,  in twl6030_gpadc_probe()
899 					sizeof(*gpadc->twl6030_cal_tbl),  in twl6030_gpadc_probe()
901 	if (!gpadc->twl6030_cal_tbl)  in twl6030_gpadc_probe()
904 	gpadc->dev = dev;  in twl6030_gpadc_probe()
905 	gpadc->pdata = pdata;  in twl6030_gpadc_probe()
908 	mutex_init(&gpadc->lock);  in twl6030_gpadc_probe()
909 	init_completion(&gpadc->irq_complete);  in twl6030_gpadc_probe()
911 	ret = pdata->calibrate(gpadc);  in twl6030_gpadc_probe()
929 		dev_err(dev, "failed to enable GPADC interrupt\n");  in twl6030_gpadc_probe()
936 		dev_err(dev, "failed to enable GPADC module\n");  in twl6030_gpadc_probe()
984 		dev_err(pdev, "error resetting GPADC (%d)!\n", ret);  in twl6030_gpadc_suspend()
996 		dev_err(pdev, "error setting GPADC (%d)!\n", ret);  in twl6030_gpadc_resume()