1 // SPDX-License-Identifier: GPL-2.0-only
3  *	w1_ds28e17.c - w1 family 19 (DS28E17) driver
28 MODULE_DESCRIPTION("w1 family 19 driver for DS28E17, 1-wire to I2C master bridge");
29 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E17));
88 	struct w1_f19_data *data = sl->family_data;  in w1_f19_i2c_busy_wait()
92 	if (w1_touch_bit(sl->master, 1) == 0)  in w1_f19_i2c_busy_wait()
100 	usleep_range(timebases[data->speed] * (data->stretch) * count,  in w1_f19_i2c_busy_wait()
101 		timebases[data->speed] * (data->stretch) * count  in w1_f19_i2c_busy_wait()
106 	while ((checks--) > 0) {  in w1_f19_i2c_busy_wait()
108 		if (w1_touch_bit(sl->master, 1) == 0)  in w1_f19_i2c_busy_wait()
111 		/* Wait one non-streched byte timeslot. */  in w1_f19_i2c_busy_wait()
112 		udelay(timebases[data->speed]);  in w1_f19_i2c_busy_wait()
116 	dev_warn(&sl->dev, "busy timeout\n");  in w1_f19_i2c_busy_wait()
117 	return -ETIMEDOUT;  in w1_f19_i2c_busy_wait()
126 		dev_warn(&sl->dev, "crc16 mismatch\n");  in w1_f19_error()
128 		dev_warn(&sl->dev, "i2c device not responding\n");  in w1_f19_error()
131 		dev_warn(&sl->dev, "i2c short write, %d bytes not acknowledged\n",  in w1_f19_error()
137 		return -ENXIO;  in w1_f19_error()
139 		return -EAGAIN;  in w1_f19_error()
141 		return -EIO;  in w1_f19_error()
148 /* Utility function: write data to I2C slave, single chunk. */
159 	w1_write_block(sl->master, command, command_count);  in __w1_f19_i2c_write()
163 	w1_write_8(sl->master, w1_buf[0]);  in __w1_f19_i2c_write()
166 	w1_write_block(sl->master, buffer, count);  in __w1_f19_i2c_write()
170 	w1_write_block(sl->master, w1_buf, 2);  in __w1_f19_i2c_write()
174 		return -ETIMEDOUT;  in __w1_f19_i2c_write()
177 	w1_read_block(sl->master, w1_buf, 2);  in __w1_f19_i2c_write()
200 		return -EOPNOTSUPP;  in w1_f19_i2c_write()
206 		 * a single onewire command.  in w1_f19_i2c_write()
227 		if (w1_reset_resume_command(sl->master))  in w1_f19_i2c_write()
228 			return -EIO;  in w1_f19_i2c_write()
232 		remaining -= W1_F19_WRITE_DATA_LIMIT;  in w1_f19_i2c_write()
243 			if (w1_reset_resume_command(sl->master))  in w1_f19_i2c_write()
244 				return -EIO;  in w1_f19_i2c_write()
248 			remaining -= W1_F19_WRITE_DATA_LIMIT;  in w1_f19_i2c_write()
271 		return -EOPNOTSUPP;  in w1_f19_i2c_read()
280 	w1_write_block(sl->master, w1_buf, 5);  in w1_f19_i2c_read()
284 		return -ETIMEDOUT;  in w1_f19_i2c_read()
287 	w1_buf[0] = w1_read_8(sl->master);  in w1_f19_i2c_read()
296 	return w1_read_block(sl->master, buffer, count);  in w1_f19_i2c_read()
310 		return -EOPNOTSUPP;  in w1_f19_i2c_write_read()
317 	w1_write_block(sl->master, w1_buf, 3);  in w1_f19_i2c_write_read()
320 	w1_write_block(sl->master, wbuffer, wcount);  in w1_f19_i2c_write_read()
326 	w1_write_block(sl->master, w1_buf, 3);  in w1_f19_i2c_write_read()
330 		return -ETIMEDOUT;  in w1_f19_i2c_write_read()
333 	w1_read_block(sl->master, w1_buf, 2);  in w1_f19_i2c_write_read()
341 	return w1_read_block(sl->master, rbuffer, rcount);  in w1_f19_i2c_write_read()
345 /* Do an I2C master transfer. */
349 	struct w1_slave *sl = (struct w1_slave *) adapter->algo_data;  in w1_f19_i2c_master_transfer()
354 	mutex_lock(&sl->master->bus_mutex);  in w1_f19_i2c_master_transfer()
358 		i = -EIO;  in w1_f19_i2c_master_transfer()
368 		if (i < (num-1)  in w1_f19_i2c_master_transfer()
437 				i == (num-1));  in w1_f19_i2c_master_transfer()
450 			if (w1_reset_resume_command(sl->master)) {  in w1_f19_i2c_master_transfer()
451 				i = -EIO;  in w1_f19_i2c_master_transfer()
459 	mutex_unlock(&sl->master->bus_mutex);  in w1_f19_i2c_master_transfer()
502 	struct w1_f19_data *data = sl->family_data;  in w1_f19_get_i2c_speed()
503 	int result = -EIO;  in w1_f19_get_i2c_speed()
506 	mutex_lock(&sl->master->bus_mutex);  in w1_f19_get_i2c_speed()
513 	w1_write_8(sl->master, W1_F19_READ_CONFIGURATION);  in w1_f19_get_i2c_speed()
514 	result = w1_read_8(sl->master);  in w1_f19_get_i2c_speed()
516 		result = -EIO;  in w1_f19_get_i2c_speed()
521 	data->speed = result;  in w1_f19_get_i2c_speed()
525 	mutex_unlock(&sl->master->bus_mutex);  in w1_f19_get_i2c_speed()
534 	struct w1_f19_data *data = sl->family_data;  in __w1_f19_set_i2c_speed()
540 		return -EIO;  in __w1_f19_set_i2c_speed()
544 	w1_write_block(sl->master, w1_buf, 2);  in __w1_f19_set_i2c_speed()
547 	data->speed = speed;  in __w1_f19_set_i2c_speed()
549 	dev_info(&sl->dev, "i2c speed set to %d kBaud\n", i2c_speeds[speed]);  in __w1_f19_set_i2c_speed()
559 	mutex_lock(&sl->master->bus_mutex);  in w1_f19_set_i2c_speed()
565 	mutex_unlock(&sl->master->bus_mutex);  in w1_f19_set_i2c_speed()
573 /* I2C speed attribute for a single chip. */
580 	/* Read current speed from slave. Updates data->speed. */  in speed_show()
597 		return -EINVAL;  in speed_store()
599 		return -EINVAL;  in speed_store()
601 		return -EINVAL;  in speed_store()
615 		return -EINVAL;  in speed_store()
628 /* Busy stretch attribute for a single chip. */
633 	struct w1_f19_data *data = sl->family_data;  in stretch_show()
636 	return sprintf(buf, "%d\n", data->stretch);  in stretch_show()
643 	struct w1_f19_data *data = sl->family_data;  in stretch_store()
647 		return -EINVAL;  in stretch_store()
649 		return -EINVAL;  in stretch_store()
651 		return -EINVAL;  in stretch_store()
654 	data->stretch = buf[0] & 0x0F;  in stretch_store()
686 	data = devm_kzalloc(&sl->dev, sizeof(*data), GFP_KERNEL);  in w1_f19_add_slave()
688 		return -ENOMEM;  in w1_f19_add_slave()
689 	sl->family_data = data;  in w1_f19_add_slave()
707 		 * We assume 400kBaud, the power-on value.  in w1_f19_add_slave()
709 		data->speed = 1;  in w1_f19_add_slave()
716 	data->stretch = i2c_stretch;  in w1_f19_add_slave()
719 	data->adapter.owner      = THIS_MODULE;  in w1_f19_add_slave()
720 	data->adapter.algo       = &w1_f19_i2c_algorithm;  in w1_f19_add_slave()
721 	data->adapter.algo_data  = sl;  in w1_f19_add_slave()
722 	strcpy(data->adapter.name, "w1-");  in w1_f19_add_slave()
723 	strcat(data->adapter.name, sl->name);  in w1_f19_add_slave()
724 	data->adapter.dev.parent = &sl->dev;  in w1_f19_add_slave()
725 	data->adapter.quirks     = &w1_f19_i2c_adapter_quirks;  in w1_f19_add_slave()
727 	return i2c_add_adapter(&data->adapter);  in w1_f19_add_slave()
732 	struct w1_f19_data *family_data = sl->family_data;  in w1_f19_remove_slave()
735 	i2c_del_adapter(&family_data->adapter);  in w1_f19_remove_slave()
738 	devm_kfree(&sl->dev, family_data);  in w1_f19_remove_slave()
739 	sl->family_data = NULL;  in w1_f19_remove_slave()