Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c
new file mode 100644
index 000000000..c8cfac555
--- /dev/null
+++ b/drivers/w1/slaves/w1_ds2413.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * w1_ds2413.c - w1 family 3a (DS2413) driver
+ * based on w1_ds2408.c by Jean-Francois Dagenais <dagenaisj@sonatest.com>
+ *
+ * Copyright (c) 2013 Mariusz Bialonczyk <manio@skyboo.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <linux/w1.h>
+
+#define W1_FAMILY_DS2413	0x3A
+
+#define W1_F3A_RETRIES                     3
+#define W1_F3A_FUNC_PIO_ACCESS_READ        0xF5
+#define W1_F3A_FUNC_PIO_ACCESS_WRITE       0x5A
+#define W1_F3A_SUCCESS_CONFIRM_BYTE        0xAA
+#define W1_F3A_INVALID_PIO_STATE           0xFF
+
+static ssize_t state_read(struct file *filp, struct kobject *kobj,
+			  struct bin_attribute *bin_attr, char *buf, loff_t off,
+			  size_t count)
+{
+	struct w1_slave *sl = kobj_to_w1_slave(kobj);
+	unsigned int retries = W1_F3A_RETRIES;
+	ssize_t bytes_read = -EIO;
+	u8 state;
+
+	dev_dbg(&sl->dev,
+		"Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p",
+		bin_attr->attr.name, kobj, (unsigned int)off, count, buf);
+
+	if (off != 0)
+		return 0;
+	if (!buf)
+		return -EINVAL;
+
+	mutex_lock(&sl->master->bus_mutex);
+	dev_dbg(&sl->dev, "mutex locked");
+
+next:
+	if (w1_reset_select_slave(sl))
+		goto out;
+
+	while (retries--) {
+		w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ);
+
+		state = w1_read_8(sl->master);
+		if ((state & 0x0F) == ((~state >> 4) & 0x0F)) {
+			/* complement is correct */
+			*buf = state;
+			bytes_read = 1;
+			goto out;
+		} else if (state == W1_F3A_INVALID_PIO_STATE) {
+			/* slave didn't respond, try to select it again */
+			dev_warn(&sl->dev, "slave device did not respond to PIO_ACCESS_READ, " \
+					    "reselecting, retries left: %d\n", retries);
+			goto next;
+		}
+
+		if (w1_reset_resume_command(sl->master))
+			goto out; /* unrecoverable error */
+
+		dev_warn(&sl->dev, "PIO_ACCESS_READ error, retries left: %d\n", retries);
+	}
+
+out:
+	mutex_unlock(&sl->master->bus_mutex);
+	dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",
+		(bytes_read > 0) ? "succeeded" : "error", retries);
+	return bytes_read;
+}
+
+static BIN_ATTR_RO(state, 1);
+
+static ssize_t output_write(struct file *filp, struct kobject *kobj,
+			    struct bin_attribute *bin_attr, char *buf,
+			    loff_t off, size_t count)
+{
+	struct w1_slave *sl = kobj_to_w1_slave(kobj);
+	u8 w1_buf[3];
+	unsigned int retries = W1_F3A_RETRIES;
+	ssize_t bytes_written = -EIO;
+
+	if (count != 1 || off != 0)
+		return -EFAULT;
+
+	dev_dbg(&sl->dev, "locking mutex for write_output");
+	mutex_lock(&sl->master->bus_mutex);
+	dev_dbg(&sl->dev, "mutex locked");
+
+	if (w1_reset_select_slave(sl))
+		goto out;
+
+	/* according to the DS2413 datasheet the most significant 6 bits
+	   should be set to "1"s, so do it now */
+	*buf = *buf | 0xFC;
+
+	while (retries--) {
+		w1_buf[0] = W1_F3A_FUNC_PIO_ACCESS_WRITE;
+		w1_buf[1] = *buf;
+		w1_buf[2] = ~(*buf);
+		w1_write_block(sl->master, w1_buf, 3);
+
+		if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) {
+			bytes_written = 1;
+			goto out;
+		}
+		if (w1_reset_resume_command(sl->master))
+			goto out; /* unrecoverable error */
+
+		dev_warn(&sl->dev, "PIO_ACCESS_WRITE error, retries left: %d\n", retries);
+	}
+
+out:
+	mutex_unlock(&sl->master->bus_mutex);
+	dev_dbg(&sl->dev, "%s, mutex unlocked, retries: %d\n",
+		(bytes_written > 0) ? "succeeded" : "error", retries);
+	return bytes_written;
+}
+
+static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1);
+
+static struct bin_attribute *w1_f3a_bin_attrs[] = {
+	&bin_attr_state,
+	&bin_attr_output,
+	NULL,
+};
+
+static const struct attribute_group w1_f3a_group = {
+	.bin_attrs = w1_f3a_bin_attrs,
+};
+
+static const struct attribute_group *w1_f3a_groups[] = {
+	&w1_f3a_group,
+	NULL,
+};
+
+static const struct w1_family_ops w1_f3a_fops = {
+	.groups		= w1_f3a_groups,
+};
+
+static struct w1_family w1_family_3a = {
+	.fid = W1_FAMILY_DS2413,
+	.fops = &w1_f3a_fops,
+};
+module_w1_family(w1_family_3a);
+
+MODULE_AUTHOR("Mariusz Bialonczyk <manio@skyboo.net>");
+MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413));