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path: root/drivers/w1/slaves/w1_therm.c
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Diffstat (limited to 'drivers/w1/slaves/w1_therm.c')
-rw-r--r--drivers/w1/slaves/w1_therm.c164
1 files changed, 135 insertions, 29 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c
index cb3fc3c6b0d1..259525c3382a 100644
--- a/drivers/w1/slaves/w1_therm.c
+++ b/drivers/w1/slaves/w1_therm.c
@@ -29,6 +29,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
+#include <linux/hwmon.h>
#include <linux/w1.h>
@@ -59,6 +60,12 @@ struct w1_therm_family_data {
atomic_t refcnt;
};
+struct therm_info {
+ u8 rom[9];
+ u8 crc;
+ u8 verdict;
+};
+
/* return the address of the refcnt in the family data */
#define THERM_REFCNT(family_data) \
(&((struct w1_therm_family_data *)family_data)->refcnt)
@@ -107,19 +114,72 @@ static struct attribute *w1_ds28ea00_attrs[] = {
&dev_attr_w1_seq.attr,
NULL,
};
+
ATTRIBUTE_GROUPS(w1_therm);
ATTRIBUTE_GROUPS(w1_ds28ea00);
+#if IS_REACHABLE(CONFIG_HWMON)
+static int w1_read_temp(struct device *dev, u32 attr, int channel,
+ long *val);
+
+static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return attr == hwmon_temp_input ? 0444 : 0;
+}
+
+static int w1_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_temp:
+ return w1_read_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static const u32 w1_temp_config[] = {
+ HWMON_T_INPUT,
+ 0
+};
+
+static const struct hwmon_channel_info w1_temp = {
+ .type = hwmon_temp,
+ .config = w1_temp_config,
+};
+
+static const struct hwmon_channel_info *w1_info[] = {
+ &w1_temp,
+ NULL
+};
+
+static const struct hwmon_ops w1_hwmon_ops = {
+ .is_visible = w1_is_visible,
+ .read = w1_read,
+};
+
+static const struct hwmon_chip_info w1_chip_info = {
+ .ops = &w1_hwmon_ops,
+ .info = w1_info,
+};
+#define W1_CHIPINFO (&w1_chip_info)
+#else
+#define W1_CHIPINFO NULL
+#endif
+
static struct w1_family_ops w1_therm_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
.groups = w1_therm_groups,
+ .chip_info = W1_CHIPINFO,
};
static struct w1_family_ops w1_ds28ea00_fops = {
.add_slave = w1_therm_add_slave,
.remove_slave = w1_therm_remove_slave,
.groups = w1_ds28ea00_groups,
+ .chip_info = W1_CHIPINFO,
};
static struct w1_family w1_therm_family_DS18S20 = {
@@ -422,33 +482,31 @@ static ssize_t w1_slave_store(struct device *device,
return ret ? : size;
}
-static ssize_t w1_slave_show(struct device *device,
- struct device_attribute *attr, char *buf)
+static ssize_t read_therm(struct device *device,
+ struct w1_slave *sl, struct therm_info *info)
{
- struct w1_slave *sl = dev_to_w1_slave(device);
struct w1_master *dev = sl->master;
- u8 rom[9], crc, verdict, external_power;
- int i, ret, max_trying = 10;
- ssize_t c = PAGE_SIZE;
+ u8 external_power;
+ int ret, max_trying = 10;
u8 *family_data = sl->family_data;
ret = mutex_lock_interruptible(&dev->bus_mutex);
if (ret != 0)
- goto post_unlock;
+ goto error;
- if (!sl->family_data) {
+ if (!family_data) {
ret = -ENODEV;
- goto pre_unlock;
+ goto mt_unlock;
}
/* prevent the slave from going away in sleep */
atomic_inc(THERM_REFCNT(family_data));
- memset(rom, 0, sizeof(rom));
+ memset(info->rom, 0, sizeof(info->rom));
while (max_trying--) {
- verdict = 0;
- crc = 0;
+ info->verdict = 0;
+ info->crc = 0;
if (!w1_reset_select_slave(sl)) {
int count = 0;
@@ -474,47 +532,69 @@ static ssize_t w1_slave_show(struct device *device,
sleep_rem = msleep_interruptible(tm);
if (sleep_rem != 0) {
ret = -EINTR;
- goto post_unlock;
+ goto dec_refcnt;
}
ret = mutex_lock_interruptible(&dev->bus_mutex);
if (ret != 0)
- goto post_unlock;
+ goto dec_refcnt;
} else if (!w1_strong_pullup) {
sleep_rem = msleep_interruptible(tm);
if (sleep_rem != 0) {
ret = -EINTR;
- goto pre_unlock;
+ goto dec_refcnt;
}
}
if (!w1_reset_select_slave(sl)) {
w1_write_8(dev, W1_READ_SCRATCHPAD);
- count = w1_read_block(dev, rom, 9);
+ count = w1_read_block(dev, info->rom, 9);
if (count != 9) {
dev_warn(device, "w1_read_block() "
"returned %u instead of 9.\n",
count);
}
- crc = w1_calc_crc8(rom, 8);
+ info->crc = w1_calc_crc8(info->rom, 8);
- if (rom[8] == crc)
- verdict = 1;
+ if (info->rom[8] == info->crc)
+ info->verdict = 1;
}
}
- if (verdict)
+ if (info->verdict)
break;
}
+dec_refcnt:
+ atomic_dec(THERM_REFCNT(family_data));
+mt_unlock:
+ mutex_unlock(&dev->bus_mutex);
+error:
+ return ret;
+}
+
+static ssize_t w1_slave_show(struct device *device,
+ struct device_attribute *attr, char *buf)
+{
+ struct w1_slave *sl = dev_to_w1_slave(device);
+ struct therm_info info;
+ u8 *family_data = sl->family_data;
+ int ret, i;
+ ssize_t c = PAGE_SIZE;
+ u8 fid = sl->family->fid;
+
+ ret = read_therm(device, sl, &info);
+ if (ret)
+ return ret;
+
for (i = 0; i < 9; ++i)
- c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", rom[i]);
+ c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]);
c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
- crc, (verdict) ? "YES" : "NO");
- if (verdict)
- memcpy(family_data, rom, sizeof(rom));
+ info.crc, (info.verdict) ? "YES" : "NO");
+ if (info.verdict)
+ memcpy(family_data, info.rom, sizeof(info.rom));
else
dev_warn(device, "Read failed CRC check\n");
@@ -523,16 +603,42 @@ static ssize_t w1_slave_show(struct device *device,
((u8 *)family_data)[i]);
c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
- w1_convert_temp(rom, sl->family->fid));
+ w1_convert_temp(info.rom, fid));
ret = PAGE_SIZE - c;
+ return ret;
+}
-pre_unlock:
- mutex_unlock(&dev->bus_mutex);
+#if IS_REACHABLE(CONFIG_HWMON)
+static int w1_read_temp(struct device *device, u32 attr, int channel,
+ long *val)
+{
+ struct w1_slave *sl = dev_get_drvdata(device);
+ struct therm_info info;
+ u8 fid = sl->family->fid;
+ int ret;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ ret = read_therm(device, sl, &info);
+ if (ret)
+ return ret;
+
+ if (!info.verdict) {
+ ret = -EIO;
+ return ret;
+ }
+
+ *val = w1_convert_temp(info.rom, fid);
+ ret = 0;
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
-post_unlock:
- atomic_dec(THERM_REFCNT(family_data));
return ret;
}
+#endif
#define W1_42_CHAIN 0x99
#define W1_42_CHAIN_OFF 0x3C