1 // SPDX-License-Identifier: GPL-2.0-only
3  * MMC35240 - MEMSIC 3-axis Magnetic Sensor
7  * IIO driver for MMC35240 (7-bit I2C slave address 0x30).
60  * #define OTP_CONVERT(REG)  ((float)((REG) >=32 ? (32 - (REG)) : (REG)) * 0.006
61  * 1) For X axis, the COEFFICIENT is always 1.
62  * 2) For Y axis, the COEFFICIENT is as below:
65  * 3) For Z axis, the COEFFICIENT is as below:
70 /* scale = 1000 here for Y otp */
71 #define MMC35240_OTP_CONVERT_Y(REG) (((REG) >= 32 ? (32 - (REG)) : (REG)) * 6)
74 #define MMC35240_OTP_CONVERT_Z(REG) (((REG) >= 32 ? (32 - (REG)) : (REG)) * 81)
77 #define MMC35240_Y_COEFF(y)	(y + 1000)  argument
96 	int sens[3]; /* sensitivity per X, Y, Z axis */
154 	MMC35240_CHANNEL(Y),
176 	return -EINVAL;  in mmc35240_get_samp_freq_index()
188 	ret = regmap_set_bits(data->regmap, MMC35240_REG_CTRL0,  in mmc35240_hw_set()
199 	return regmap_set_bits(data->regmap, MMC35240_REG_CTRL0, coil_bit);  in mmc35240_hw_set()
209 	ret = regmap_read(data->regmap, MMC35240_REG_ID, &reg_id);  in mmc35240_init()
211 		dev_err(&data->client->dev, "Error reading product id\n");  in mmc35240_init()
215 	dev_dbg(&data->client->dev, "MMC35240 chip id %x\n", reg_id);  in mmc35240_init()
219 	 * a SET/RESET sequence, the axis polarity being naturally  in mmc35240_init()
232 	ret = regmap_update_bits(data->regmap, MMC35240_REG_CTRL1,  in mmc35240_init()
234 				 data->res << MMC35240_CTRL1_BW_SHIFT);  in mmc35240_init()
238 	ret = regmap_bulk_read(data->regmap, MMC35240_OTP_START_ADDR,  in mmc35240_init()
247 	data->axis_coef[0] = MMC35240_X_COEFF(1);  in mmc35240_init()
248 	data->axis_coef[1] = MMC35240_Y_COEFF(y_convert);  in mmc35240_init()
249 	data->axis_coef[2] = MMC35240_Z_COEFF(z_convert);  in mmc35240_init()
251 	data->axis_scale[0] = 1;  in mmc35240_init()
252 	data->axis_scale[1] = 1000;  in mmc35240_init()
253 	data->axis_scale[2] = 10000;  in mmc35240_init()
263 	ret = regmap_write(data->regmap, MMC35240_REG_CTRL0,  in mmc35240_take_measurement()
268 	while (tries-- > 0) {  in mmc35240_take_measurement()
269 		ret = regmap_read(data->regmap, MMC35240_REG_STATUS,  in mmc35240_take_measurement()
280 		dev_err(&data->client->dev, "data not ready\n");  in mmc35240_take_measurement()
281 		return -EIO;  in mmc35240_take_measurement()
295 	return regmap_bulk_read(data->regmap, MMC35240_REG_XOUT_L, buf,  in mmc35240_read_measurement()
300  * mmc35240_raw_to_mgauss - convert raw readings to milli gauss. Also apply
304  * @index: axis index for which we want the conversion
308  * Returns: 0 in case of success, -EINVAL when @index is not valid
321 	sens[AXIS_X] = mmc35240_props_table[data->res].sens[AXIS_X];  in mmc35240_raw_to_mgauss()
322 	sens[AXIS_Y] = mmc35240_props_table[data->res].sens[AXIS_Y];  in mmc35240_raw_to_mgauss()
323 	sens[AXIS_Z] = mmc35240_props_table[data->res].sens[AXIS_Z];  in mmc35240_raw_to_mgauss()
325 	nfo = mmc35240_props_table[data->res].nfo;  in mmc35240_raw_to_mgauss()
329 		*val = (raw[AXIS_X] - nfo) * 1000 / sens[AXIS_X];  in mmc35240_raw_to_mgauss()
332 		*val = (raw[AXIS_Y] - nfo) * 1000 / sens[AXIS_Y] -  in mmc35240_raw_to_mgauss()
333 			(raw[AXIS_Z] - nfo)  * 1000 / sens[AXIS_Z];  in mmc35240_raw_to_mgauss()
336 		*val = (raw[AXIS_Y] - nfo) * 1000 / sens[AXIS_Y] +  in mmc35240_raw_to_mgauss()
337 			(raw[AXIS_Z] - nfo) * 1000 / sens[AXIS_Z];  in mmc35240_raw_to_mgauss()
340 		return -EINVAL;  in mmc35240_raw_to_mgauss()
343 	*val = (*val) * data->axis_coef[index] / data->axis_scale[index];  in mmc35240_raw_to_mgauss()
359 		mutex_lock(&data->mutex);  in mmc35240_read_raw()
361 		mutex_unlock(&data->mutex);  in mmc35240_read_raw()
364 		ret = mmc35240_raw_to_mgauss(data, chan->address, buf, val);  in mmc35240_read_raw()
373 		mutex_lock(&data->mutex);  in mmc35240_read_raw()
374 		ret = regmap_read(data->regmap, MMC35240_REG_CTRL1, &reg);  in mmc35240_read_raw()
375 		mutex_unlock(&data->mutex);  in mmc35240_read_raw()
381 			return -EINVAL;  in mmc35240_read_raw()
387 		return -EINVAL;  in mmc35240_read_raw()
402 			return -EINVAL;  in mmc35240_write_raw()
403 		mutex_lock(&data->mutex);  in mmc35240_write_raw()
404 		ret = regmap_update_bits(data->regmap, MMC35240_REG_CTRL1,  in mmc35240_write_raw()
407 		mutex_unlock(&data->mutex);  in mmc35240_write_raw()
410 		return -EINVAL;  in mmc35240_write_raw()
488 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));  in mmc35240_probe()
490 		return -ENOMEM;  in mmc35240_probe()
494 		dev_err(&client->dev, "regmap initialization failed\n");  in mmc35240_probe()
500 	data->client = client;  in mmc35240_probe()
501 	data->regmap = regmap;  in mmc35240_probe()
502 	data->res = MMC35240_16_BITS_SLOW;  in mmc35240_probe()
504 	mutex_init(&data->mutex);  in mmc35240_probe()
506 	indio_dev->info = &mmc35240_info;  in mmc35240_probe()
507 	indio_dev->name = MMC35240_DRV_NAME;  in mmc35240_probe()
508 	indio_dev->channels = mmc35240_channels;  in mmc35240_probe()
509 	indio_dev->num_channels = ARRAY_SIZE(mmc35240_channels);  in mmc35240_probe()
510 	indio_dev->modes = INDIO_DIRECT_MODE;  in mmc35240_probe()
514 		dev_err(&client->dev, "mmc35240 chip init failed\n");  in mmc35240_probe()
517 	return devm_iio_device_register(&client->dev, indio_dev);  in mmc35240_probe()
525 	regcache_cache_only(data->regmap, true);  in mmc35240_suspend()
536 	regcache_mark_dirty(data->regmap);  in mmc35240_resume()
537 	ret = regcache_sync_region(data->regmap, MMC35240_REG_CTRL0,  in mmc35240_resume()
542 	regcache_cache_only(data->regmap, false);  in mmc35240_resume()