3  * TWL6030 GPADC module driver
85  * struct twl6030_ideal_code - GPADC calibration parameters
86  * GPADC is calibrated in two points: close to the beginning and
107  * @nchannels:		number of GPADC channels
121 	int (*calibrate)(struct twl6030_gpadc_data *gpadc);
125  * struct twl6030_gpadc_data - GPADC data
384 	struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);  in twl6030_gpadc_irq_handler()  local
386 	complete(&gpadc->irq_complete);  in twl6030_gpadc_irq_handler()
447 static int twl6030_gpadc_make_correction(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_make_correction()  argument
450 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_gpadc_make_correction()
454 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_gpadc_make_correction()
456 		gpadc->twl6030_cal_tbl[i].offset_error) /  in twl6030_gpadc_make_correction()
457 		gpadc->twl6030_cal_tbl[i].gain_error;  in twl6030_gpadc_make_correction()
462 static int twl6030_gpadc_get_raw(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_get_raw()  argument
465 	u8 reg = gpadc->pdata->channel_to_reg(channel);  in twl6030_gpadc_get_raw()
472 		dev_dbg(gpadc->dev, "unable to read register 0x%X\n", reg);  in twl6030_gpadc_get_raw()
477 	dev_dbg(gpadc->dev, "GPADC raw code: %d", raw_code);  in twl6030_gpadc_get_raw()
479 	if (twl6030_channel_calibrated(gpadc->pdata, channel))  in twl6030_gpadc_get_raw()
480 		*res = twl6030_gpadc_make_correction(gpadc, channel, raw_code);  in twl6030_gpadc_get_raw()
487 static int twl6030_gpadc_get_processed(struct twl6030_gpadc_data *gpadc,  in twl6030_gpadc_get_processed()  argument
490 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_gpadc_get_processed()
496 	ret = twl6030_gpadc_get_raw(gpadc, channel, &corrected_code);  in twl6030_gpadc_get_processed()
500 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_gpadc_get_processed()
502 			gpadc->twl6030_cal_tbl[i].gain;  in twl6030_gpadc_get_processed()
507 	dev_dbg(gpadc->dev, "GPADC corrected code: %d", corrected_code);  in twl6030_gpadc_get_processed()
508 	dev_dbg(gpadc->dev, "GPADC value: %d", channel_value);  in twl6030_gpadc_get_processed()
519 	struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);  in twl6030_gpadc_read_raw()  local
523 	mutex_lock(&gpadc->lock);  in twl6030_gpadc_read_raw()
525 	ret = gpadc->pdata->start_conversion(chan->channel);  in twl6030_gpadc_read_raw()
527 		dev_err(gpadc->dev, "failed to start conversion\n");  in twl6030_gpadc_read_raw()
532 				&gpadc->irq_complete, msecs_to_jiffies(5000));  in twl6030_gpadc_read_raw()
543 		ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val);  in twl6030_gpadc_read_raw()
548 		ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val);  in twl6030_gpadc_read_raw()
556 	mutex_unlock(&gpadc->lock);  in twl6030_gpadc_read_raw()
562  * The GPADC channels are calibrated using a two point calibration method.
572 static void twl6030_calibrate_channel(struct twl6030_gpadc_data *gpadc,  in twl6030_calibrate_channel()  argument
576 	const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;  in twl6030_calibrate_channel()
578 	i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);  in twl6030_calibrate_channel()
593 	gpadc->twl6030_cal_tbl[i].gain = gain;  in twl6030_calibrate_channel()
594 	gpadc->twl6030_cal_tbl[i].gain_error = k;  in twl6030_calibrate_channel()
595 	gpadc->twl6030_cal_tbl[i].offset_error = b;  in twl6030_calibrate_channel()
597 	dev_dbg(gpadc->dev, "GPADC d1   for Chn: %d = %d\n", channel, d1);  in twl6030_calibrate_channel()
598 	dev_dbg(gpadc->dev, "GPADC d2   for Chn: %d = %d\n", channel, d2);  in twl6030_calibrate_channel()
599 	dev_dbg(gpadc->dev, "GPADC x1   for Chn: %d = %d\n", channel, x1);  in twl6030_calibrate_channel()
600 	dev_dbg(gpadc->dev, "GPADC x2   for Chn: %d = %d\n", channel, x2);  in twl6030_calibrate_channel()
601 	dev_dbg(gpadc->dev, "GPADC Gain for Chn: %d = %d\n", channel, gain);  in twl6030_calibrate_channel()
602 	dev_dbg(gpadc->dev, "GPADC k    for Chn: %d = %d\n", channel, k);  in twl6030_calibrate_channel()
603 	dev_dbg(gpadc->dev, "GPADC b    for Chn: %d = %d\n", channel, b);  in twl6030_calibrate_channel()
620 static int twl6030_calibration(struct twl6030_gpadc_data *gpadc)  in twl6030_calibration()  argument
637 		dev_err(gpadc->dev, "calibration failed\n");  in twl6030_calibration()
687 		twl6030_calibrate_channel(gpadc, chn, d1, d2);  in twl6030_calibration()
707 static int twl6032_calibration(struct twl6030_gpadc_data *gpadc)  in twl6032_calibration()  argument
716 		dev_err(gpadc->dev, "calibration failed\n");  in twl6032_calibration()
722 	 * GPADC not values.  in twl6032_calibration()
795 		twl6030_calibrate_channel(gpadc, chn, d1, d2);  in twl6032_calibration()
866 		.compatible = "ti,twl6030-gpadc",
870 		.compatible = "ti,twl6032-gpadc",
880 	struct twl6030_gpadc_data *gpadc;  in twl6030_gpadc_probe()  local
893 	indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));  in twl6030_gpadc_probe()
897 	gpadc = iio_priv(indio_dev);  in twl6030_gpadc_probe()
899 	gpadc->twl6030_cal_tbl = devm_kcalloc(dev,  in twl6030_gpadc_probe()
901 					sizeof(*gpadc->twl6030_cal_tbl),  in twl6030_gpadc_probe()
903 	if (!gpadc->twl6030_cal_tbl)  in twl6030_gpadc_probe()
906 	gpadc->dev = dev;  in twl6030_gpadc_probe()
907 	gpadc->pdata = pdata;  in twl6030_gpadc_probe()
910 	mutex_init(&gpadc->lock);  in twl6030_gpadc_probe()
911 	init_completion(&gpadc->irq_complete);  in twl6030_gpadc_probe()
913 	ret = pdata->calibrate(gpadc);  in twl6030_gpadc_probe()
931 		dev_err(dev, "failed to enable GPADC interrupt\n");  in twl6030_gpadc_probe()
938 		dev_err(dev, "failed to enable GPADC module\n");  in twl6030_gpadc_probe()
988 		dev_err(pdev, "error resetting GPADC (%d)!\n", ret);  in twl6030_gpadc_suspend()
1000 		dev_err(pdev, "error setting GPADC (%d)!\n", ret);  in twl6030_gpadc_resume()