1 // SPDX-License-Identifier: GPL-2.0-only
4   * Copyright (C) 2008-2010 Jonathan Cameron
7   * Copyright (C) 2002-2004 Stefan Eletzhofer
51 /* think about including max11600 etc - more settings */
58 /* max1363 only - though don't care on others.
79 /* max123{6-9} only */
82 /* max1363 only - merely part of channel selects or don't care for others */
87 /* max1363 strictly 0x06 - but doesn't matter */
94  * struct max1363_mode - scan mode information
122  * struct max1363_chip_info - chip specifc information
144  * struct max1363_state - driver instance specific data
159  * @vref:		Reference voltage regulator
183 	struct regulator		*vref;  member
305 		for (i = 0; i < ci->num_modes; i++)  in max1363_match_mode()
307 					  max1363_mode_table[ci->mode_list[i]].  in max1363_match_mode()
310 				return &max1363_mode_table[ci->mode_list[i]];  in max1363_match_mode()
342 	u8 tx_buf[2] = { st->setupbyte, st->configbyte };  in max1363_write_basic_config()
344 	return st->send(st->client, tx_buf, 2);  in max1363_write_basic_config()
349 	st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK  in max1363_set_scan_mode()
352 	st->configbyte |= st->current_mode->conf;  in max1363_set_scan_mode()
366 	struct i2c_client *client = st->client;  in max1363_read_single_chan()
371 	mutex_lock(&st->lock);  in max1363_read_single_chan()
380 	if (st->monitor_on) {  in max1363_read_single_chan()
381 		ret = -EBUSY;  in max1363_read_single_chan()
386 	if (st->current_mode != &max1363_mode_table[chan->address]) {  in max1363_read_single_chan()
388 		st->current_mode = &max1363_mode_table[chan->address];  in max1363_read_single_chan()
393 	if (st->chip_info->bits != 8) {  in max1363_read_single_chan()
395 		data = st->recv(client, rxbuf, 2);  in max1363_read_single_chan()
401 		  ((1 << st->chip_info->bits) - 1);  in max1363_read_single_chan()
404 		data = st->recv(client, rxbuf, 1);  in max1363_read_single_chan()
414 	mutex_unlock(&st->lock);  in max1363_read_single_chan()
436 		*val = st->vref_uv / 1000;  in max1363_read_raw()
437 		*val2 = st->chip_info->bits;  in max1363_read_raw()
440 		return -EINVAL;  in max1363_read_raw()
498 		.datasheet_name = "AIN"#num"-AIN"#num2,			\
690 	return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);  in max1363_monitor_show_freq()
706 		return -EINVAL;  in max1363_monitor_store_freq()
713 		return -EINVAL;  in max1363_monitor_store_freq()
715 	mutex_lock(&st->lock);  in max1363_monitor_store_freq()
716 	st->monitor_speed = i;  in max1363_monitor_store_freq()
717 	mutex_unlock(&st->lock);  in max1363_monitor_store_freq()
736 		*val = st->thresh_low[chan->channel];  in max1363_read_thresh()
738 		*val = st->thresh_high[chan->channel];  in max1363_read_thresh()
749 	switch (st->chip_info->bits) {  in max1363_write_thresh()
752 			return -EINVAL;  in max1363_write_thresh()
756 			return -EINVAL;  in max1363_write_thresh()
762 		st->thresh_low[chan->channel] = val;  in max1363_write_thresh()
765 		st->thresh_high[chan->channel] = val;  in max1363_write_thresh()
768 		return -EINVAL;  in max1363_write_thresh()
800 	u8 tx[2] = { st->setupbyte,  in max1363_event_handler()
801 		     MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };  in max1363_event_handler()
803 	st->recv(st->client, &rx, 1);  in max1363_event_handler()
807 	st->send(st->client, tx, 2);  in max1363_event_handler()
818 	int number = chan->channel;  in max1363_read_event_config()
820 	mutex_lock(&st->lock);  in max1363_read_event_config()
822 		val = (1 << number) & st->mask_low;  in max1363_read_event_config()
824 		val = (1 << number) & st->mask_high;  in max1363_read_event_config()
825 	mutex_unlock(&st->lock);  in max1363_read_event_config()
840 		st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;  in max1363_monitor_mode_update()
841 		st->configbyte &= ~MAX1363_SCAN_MASK;  in max1363_monitor_mode_update()
842 		st->monitor_on = false;  in max1363_monitor_mode_update()
847 	st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;  in max1363_monitor_mode_update()
848 	st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK  in max1363_monitor_mode_update()
851 	st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;  in max1363_monitor_mode_update()
852 	if ((st->mask_low | st->mask_high) & 0x0F) {  in max1363_monitor_mode_update()
853 		st->configbyte |= max1363_mode_table[s0to3].conf;  in max1363_monitor_mode_update()
855 	} else if ((st->mask_low | st->mask_high) & 0x30) {  in max1363_monitor_mode_update()
856 		st->configbyte |= max1363_mode_table[d0m1to2m3].conf;  in max1363_monitor_mode_update()
859 		st->configbyte |= max1363_mode_table[d1m0to3m2].conf;  in max1363_monitor_mode_update()
866 		ret = -ENOMEM;  in max1363_monitor_mode_update()
869 	tx_buf[0] = st->configbyte;  in max1363_monitor_mode_update()
870 	tx_buf[1] = st->setupbyte;  in max1363_monitor_mode_update()
871 	tx_buf[2] = (st->monitor_speed << 1);  in max1363_monitor_mode_update()
880 			if (st->mask_low & (1 << j)) {  in max1363_monitor_mode_update()
881 				tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;  in max1363_monitor_mode_update()
882 				tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;  in max1363_monitor_mode_update()
890 			if (st->mask_high & (1 << j)) {  in max1363_monitor_mode_update()
892 					(st->thresh_high[j] >> 8) & 0x0F;  in max1363_monitor_mode_update()
893 				tx_buf[i + 2] = st->thresh_high[j] & 0xFF;  in max1363_monitor_mode_update()
905 	ret = st->send(st->client, tx_buf, len);  in max1363_monitor_mode_update()
909 		ret = -EIO;  in max1363_monitor_mode_update()
920 	tx_buf[0] = st->setupbyte;  in max1363_monitor_mode_update()
921 	tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;  in max1363_monitor_mode_update()
922 	ret = st->send(st->client, tx_buf, 2);  in max1363_monitor_mode_update()
926 		ret = -EIO;  in max1363_monitor_mode_update()
930 	st->monitor_on = true;  in max1363_monitor_mode_update()
940  * Scan 0...3, 0-1,2-3 and 1-0,3-2
949 			ret = -EBUSY;  in __max1363_check_event_mask()
954 			ret = -EBUSY;  in __max1363_check_event_mask()
958 		ret = -EBUSY;  in __max1363_check_event_mask()
970 	int number = chan->channel;  in max1363_write_event_config()
975 	mutex_lock(&st->lock);  in max1363_write_event_config()
977 	unifiedmask = st->mask_low | st->mask_high;  in max1363_write_event_config()
981 			st->mask_low &= ~(1 << number);  in max1363_write_event_config()
987 			st->mask_low |= (1 << number);  in max1363_write_event_config()
991 			st->mask_high &= ~(1 << number);  in max1363_write_event_config()
997 			st->mask_high |= (1 << number);  in max1363_write_event_config()
1001 	max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));  in max1363_write_event_config()
1003 	mutex_unlock(&st->lock);  in max1363_write_event_config()
1032 	st->current_mode = max1363_match_mode(scan_mask, st->chip_info);  in max1363_update_scan_mode()
1033 	if (!st->current_mode)  in max1363_update_scan_mode()
1034 		return -EINVAL;  in max1363_update_scan_mode()
1054 /* max1363 and max1368 tested - rest from data sheet */
1440 	st->setupbyte = MAX1363_SETUP_INT_CLOCK  in max1363_initial_setup()
1444 	if (st->vref)  in max1363_initial_setup()
1445 		st->setupbyte |= MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF;  in max1363_initial_setup()
1447 		st->setupbyte |= MAX1363_SETUP_POWER_UP_INT_REF  in max1363_initial_setup()
1451 	st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);  in max1363_initial_setup()
1452 	st->current_mode = &max1363_mode_table[st->chip_info->default_mode];  in max1363_initial_setup()
1453 	st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte);  in max1363_initial_setup()
1464 	masks = devm_kzalloc(&indio_dev->dev,  in max1363_alloc_scan_masks()
1467 				    st->chip_info->num_modes + 1),  in max1363_alloc_scan_masks()
1470 		return -ENOMEM;  in max1363_alloc_scan_masks()
1472 	for (i = 0; i < st->chip_info->num_modes; i++)  in max1363_alloc_scan_masks()
1474 			    max1363_mode_table[st->chip_info->mode_list[i]]  in max1363_alloc_scan_masks()
1477 	indio_dev->available_scan_masks = masks;  in max1363_alloc_scan_masks()
1482 static irqreturn_t max1363_trigger_handler(int irq, void *p)  in max1363_trigger_handler()  argument
1484 	struct iio_poll_func *pf = p;  in max1363_trigger_handler()
1485 	struct iio_dev *indio_dev = pf->indio_dev;  in max1363_trigger_handler()
1490 	unsigned long numvals = bitmap_weight(st->current_mode->modemask,  in max1363_trigger_handler()
1494 	if (st->chip_info->bits != 8)  in max1363_trigger_handler()
1498 	if (indio_dev->scan_timestamp) {  in max1363_trigger_handler()
1501 			d_size += sizeof(s64) - (d_size % sizeof(s64));  in max1363_trigger_handler()
1513 	if (st->chip_info->bits != 8)  in max1363_trigger_handler()
1514 		b_sent = st->recv(st->client, rxbuf, numvals * 2);  in max1363_trigger_handler()
1516 		b_sent = st->recv(st->client, rxbuf, numvals);  in max1363_trigger_handler()
1526 	iio_trigger_notify_done(indio_dev->trig);  in max1363_trigger_handler()
1590 	struct regulator *vref;  in max1363_probe()  local
1592 	indio_dev = devm_iio_device_alloc(&client->dev,  in max1363_probe()
1595 		return -ENOMEM;  in max1363_probe()
1599 	mutex_init(&st->lock);  in max1363_probe()
1600 	st->reg = devm_regulator_get(&client->dev, "vcc");  in max1363_probe()
1601 	if (IS_ERR(st->reg))  in max1363_probe()
1602 		return PTR_ERR(st->reg);  in max1363_probe()
1604 	ret = regulator_enable(st->reg);  in max1363_probe()
1608 	ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, st->reg);  in max1363_probe()
1612 	st->chip_info = device_get_match_data(&client->dev);  in max1363_probe()
1613 	if (!st->chip_info)  in max1363_probe()
1614 		st->chip_info = &max1363_chip_info_tbl[id->driver_data];  in max1363_probe()
1615 	st->client = client;  in max1363_probe()
1617 	st->vref_uv = st->chip_info->int_vref_mv * 1000;  in max1363_probe()
1618 	vref = devm_regulator_get_optional(&client->dev, "vref");  in max1363_probe()
1619 	if (!IS_ERR(vref)) {  in max1363_probe()
1622 		ret = regulator_enable(vref);  in max1363_probe()
1626 		ret = devm_add_action_or_reset(&client->dev, max1363_reg_disable, vref);  in max1363_probe()
1630 		st->vref = vref;  in max1363_probe()
1631 		vref_uv = regulator_get_voltage(vref);  in max1363_probe()
1633 			return -EINVAL;  in max1363_probe()
1635 		st->vref_uv = vref_uv;  in max1363_probe()
1638 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in max1363_probe()
1639 		st->send = i2c_master_send;  in max1363_probe()
1640 		st->recv = i2c_master_recv;  in max1363_probe()
1641 	} else if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)  in max1363_probe()
1642 			&& st->chip_info->bits == 8) {  in max1363_probe()
1643 		st->send = max1363_smbus_send;  in max1363_probe()
1644 		st->recv = max1363_smbus_recv;  in max1363_probe()
1646 		return -EOPNOTSUPP;  in max1363_probe()
1653 	indio_dev->name = id->name;  in max1363_probe()
1654 	indio_dev->channels = st->chip_info->channels;  in max1363_probe()
1655 	indio_dev->num_channels = st->chip_info->num_channels;  in max1363_probe()
1656 	indio_dev->info = st->chip_info->info;  in max1363_probe()
1657 	indio_dev->modes = INDIO_DIRECT_MODE;  in max1363_probe()
1662 	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,  in max1363_probe()
1667 	if (client->irq) {  in max1363_probe()
1668 		ret = devm_request_threaded_irq(&client->dev, st->client->irq,  in max1363_probe()
1679 	return devm_iio_device_register(&client->dev, indio_dev);  in max1363_probe()