1 // SPDX-License-Identifier: GPL-2.0-only
3  * w1_ds2413.c - w1 family 3a (DS2413) driver
4  * based on w1_ds2408.c by Jean-Francois Dagenais <dagenaisj@sonatest.com>
33 	ssize_t bytes_read = -EIO;  in state_read()
36 	dev_dbg(&sl->dev,  in state_read()
38 		bin_attr->attr.name, kobj, (unsigned int)off, count, buf);  in state_read()
43 		return -EINVAL;  in state_read()
45 	mutex_lock(&sl->master->bus_mutex);  in state_read()
46 	dev_dbg(&sl->dev, "mutex locked");  in state_read()
52 	while (retries--) {  in state_read()
53 		w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ);  in state_read()
55 		state = w1_read_8(sl->master);  in state_read()
63 			dev_warn(&sl->dev, "slave device did not respond to PIO_ACCESS_READ, " \  in state_read()
64 					    "reselecting, retries left: %d\n", retries);  in state_read()
68 		if (w1_reset_resume_command(sl->master))  in state_read()
71 		dev_warn(&sl->dev, "PIO_ACCESS_READ error, retries left: %d\n", retries);  in state_read()
75 	mutex_unlock(&sl->master->bus_mutex);  in state_read()
76 	dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",  in state_read()
90 	ssize_t bytes_written = -EIO;  in output_write()
93 		return -EFAULT;  in output_write()
95 	dev_dbg(&sl->dev, "locking mutex for write_output");  in output_write()
96 	mutex_lock(&sl->master->bus_mutex);  in output_write()
97 	dev_dbg(&sl->dev, "mutex locked");  in output_write()
103 	 * according to the DS2413 datasheet the most significant 6 bits  in output_write()
108 	while (retries--) {  in output_write()
112 		w1_write_block(sl->master, w1_buf, 3);  in output_write()
114 		if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) {  in output_write()
118 		if (w1_reset_resume_command(sl->master))  in output_write()
121 		dev_warn(&sl->dev, "PIO_ACCESS_WRITE error, retries left: %d\n", retries);  in output_write()
125 	mutex_unlock(&sl->master->bus_mutex);  in output_write()
126 	dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",  in output_write()
161 MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413));