Linux-libre 4.2-gnu

3 files changed, 118 insertions, 2 deletions

diff --git a/drivers/w1/masters/ds2482.c b/drivers/w1/masters/ds2482.c
index e76a9b39a..a674409ed 100644
--- a/drivers/w1/masters/ds2482.c
+++ b/drivers/w1/masters/ds2482.c
@@ -93,6 +93,7 @@ static const struct i2c_device_id ds2482_id[] = {
 	{ "ds2482", 0 },
 	{ }
 };
+MODULE_DEVICE_TABLE(i2c, ds2482_id);
 
 static struct i2c_driver ds2482_driver = {
 	.driver = {
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index 55eb86c9e..2f029e8f4 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -92,13 +92,24 @@ static void w1_therm_remove_slave(struct w1_slave *sl)
 static ssize_t w1_slave_show(struct device *device,
 	struct device_attribute *attr, char *buf);
 
+static ssize_t w1_seq_show(struct device *device,
+	struct device_attribute *attr, char *buf);
+
 static DEVICE_ATTR_RO(w1_slave);
+static DEVICE_ATTR_RO(w1_seq);
 
 static struct attribute *w1_therm_attrs[] = {
 	&dev_attr_w1_slave.attr,
 	NULL,
 };
+
+static struct attribute *w1_ds28ea00_attrs[] = {
+	&dev_attr_w1_slave.attr,
+	&dev_attr_w1_seq.attr,
+	NULL,
+};
 ATTRIBUTE_GROUPS(w1_therm);
+ATTRIBUTE_GROUPS(w1_ds28ea00);
 
 static struct w1_family_ops w1_therm_fops = {
 	.add_slave	= w1_therm_add_slave,
@@ -106,6 +117,12 @@ static struct w1_family_ops w1_therm_fops = {
 	.groups		= w1_therm_groups,
 };
 
+static struct w1_family_ops w1_ds28ea00_fops = {
+	.add_slave	= w1_therm_add_slave,
+	.remove_slave	= w1_therm_remove_slave,
+	.groups		= w1_ds28ea00_groups,
+};
+
 static struct w1_family w1_therm_family_DS18S20 = {
 	.fid = W1_THERM_DS18S20,
 	.fops = &w1_therm_fops,
@@ -123,7 +140,7 @@ static struct w1_family w1_therm_family_DS1822 = {
 
 static struct w1_family w1_therm_family_DS28EA00 = {
 	.fid = W1_THERM_DS28EA00,
-	.fops = &w1_therm_fops,
+	.fops = &w1_ds28ea00_fops,
 };
 
 static struct w1_family w1_therm_family_DS1825 = {
@@ -316,6 +333,89 @@ post_unlock:
 	return ret;
 }
 
+#define W1_42_CHAIN	0x99
+#define W1_42_CHAIN_OFF	0x3C
+#define W1_42_CHAIN_OFF_INV	0xC3
+#define W1_42_CHAIN_ON	0x5A
+#define W1_42_CHAIN_ON_INV	0xA5
+#define W1_42_CHAIN_DONE 0x96
+#define W1_42_CHAIN_DONE_INV 0x69
+#define W1_42_COND_READ	0x0F
+#define W1_42_SUCCESS_CONFIRM_BYTE 0xAA
+#define W1_42_FINISHED_BYTE 0xFF
+static ssize_t w1_seq_show(struct device *device,
+	struct device_attribute *attr, char *buf)
+{
+	struct w1_slave *sl = dev_to_w1_slave(device);
+	ssize_t c = PAGE_SIZE;
+	int rv;
+	int i;
+	u8 ack;
+	u64 rn;
+	struct w1_reg_num *reg_num;
+	int seq = 0;
+
+	mutex_lock(&sl->master->bus_mutex);
+	/* Place all devices in CHAIN state */
+	if (w1_reset_bus(sl->master))
+		goto error;
+	w1_write_8(sl->master, W1_SKIP_ROM);
+	w1_write_8(sl->master, W1_42_CHAIN);
+	w1_write_8(sl->master, W1_42_CHAIN_ON);
+	w1_write_8(sl->master, W1_42_CHAIN_ON_INV);
+	msleep(sl->master->pullup_duration);
+
+	/* check for acknowledgment */
+	ack = w1_read_8(sl->master);
+	if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
+		goto error;
+
+	/* In case the bus fails to send 0xFF, limit*/
+	for (i = 0; i <= 64; i++) {
+		if (w1_reset_bus(sl->master))
+			goto error;
+
+		w1_write_8(sl->master, W1_42_COND_READ);
+		rv = w1_read_block(sl->master, (u8 *)&rn, 8);
+		reg_num = (struct w1_reg_num *) &rn;
+		if (reg_num->family == W1_42_FINISHED_BYTE)
+			break;
+		if (sl->reg_num.id == reg_num->id)
+			seq = i;
+
+		w1_write_8(sl->master, W1_42_CHAIN);
+		w1_write_8(sl->master, W1_42_CHAIN_DONE);
+		w1_write_8(sl->master, W1_42_CHAIN_DONE_INV);
+		w1_read_block(sl->master, &ack, sizeof(ack));
+
+		/* check for acknowledgment */
+		ack = w1_read_8(sl->master);
+		if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
+			goto error;
+
+	}
+
+	/* Exit from CHAIN state */
+	if (w1_reset_bus(sl->master))
+		goto error;
+	w1_write_8(sl->master, W1_SKIP_ROM);
+	w1_write_8(sl->master, W1_42_CHAIN);
+	w1_write_8(sl->master, W1_42_CHAIN_OFF);
+	w1_write_8(sl->master, W1_42_CHAIN_OFF_INV);
+
+	/* check for acknowledgment */
+	ack = w1_read_8(sl->master);
+	if (ack != W1_42_SUCCESS_CONFIRM_BYTE)
+		goto error;
+	mutex_unlock(&sl->master->bus_mutex);
+
+	c -= snprintf(buf + PAGE_SIZE - c, c, "%d\n", seq);
+	return PAGE_SIZE - c;
+error:
+	mutex_unlock(&sl->master->bus_mutex);
+	return -EIO;
+}
+
 static int __init w1_therm_init(void)
 {
 	int err, i;
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 181f41cb9..c9a7ff67d 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -46,11 +46,15 @@ MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
 
 static int w1_timeout = 10;
+static int w1_timeout_us = 0;
 int w1_max_slave_count = 64;
 int w1_max_slave_ttl = 10;
 
 module_param_named(timeout, w1_timeout, int, 0);
 MODULE_PARM_DESC(timeout, "time in seconds between automatic slave searches");
+module_param_named(timeout_us, w1_timeout_us, int, 0);
+MODULE_PARM_DESC(timeout, "time in microseconds between automatic slave"
+		          " searches");
 /* A search stops when w1_max_slave_count devices have been found in that
  * search.  The next search will start over and detect the same set of devices
  * on a static 1-wire bus.  Memory is not allocated based on this number, just
@@ -317,6 +321,14 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic
 	return count;
 }
 
+static ssize_t w1_master_attribute_show_timeout_us(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	ssize_t count;
+	count = sprintf(buf, "%d\n", w1_timeout_us);
+	return count;
+}
+
 static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -543,6 +555,7 @@ static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
 static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP);
 static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
 static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
+static W1_MASTER_ATTR_RO(timeout_us, S_IRUGO);
 static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
 static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUSR | S_IWGRP);
 static W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUSR | S_IWGRP);
@@ -556,6 +569,7 @@ static struct attribute *w1_master_default_attrs[] = {
 	&w1_master_attribute_max_slave_count.attr,
 	&w1_master_attribute_attempts.attr,
 	&w1_master_attribute_timeout.attr,
+	&w1_master_attribute_timeout_us.attr,
 	&w1_master_attribute_pointer.attr,
 	&w1_master_attribute_search.attr,
 	&w1_master_attribute_pullup.attr,
@@ -1108,7 +1122,8 @@ int w1_process(void *data)
 	/* As long as w1_timeout is only set by a module parameter the sleep
 	 * time can be calculated in jiffies once.
 	 */
-	const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000);
+	const unsigned long jtime =
+	  usecs_to_jiffies(w1_timeout * 1000000 + w1_timeout_us);
 	/* remainder if it woke up early */
 	unsigned long jremain = 0;