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path: root/drivers/hwmon/lm75.c
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Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c114
1 files changed, 97 insertions, 17 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 5b2ea05c951e..e00750718536 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -7,11 +7,11 @@
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/regmap.h>
@@ -25,6 +25,7 @@
enum lm75_type { /* keep sorted in alphabetical order */
adt75,
+ as6200,
at30ts74,
ds1775,
ds75,
@@ -55,6 +56,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
/**
* struct lm75_params - lm75 configuration parameters.
+ * @config_reg_16bits: Configure register size is 2 bytes.
* @set_mask: Bits to set in configuration register when configuring
* the chip.
* @clr_mask: Bits to clear in configuration register when configuring
@@ -75,17 +77,20 @@ enum lm75_type { /* keep sorted in alphabetical order */
* @sample_times: All the possible sample times to be set. Mandatory if
* num_sample_times is larger than 1. If set, number of
* entries must match num_sample_times.
+ * @alarm: Alarm bit is supported.
*/
struct lm75_params {
- u8 set_mask;
- u8 clr_mask;
+ bool config_reg_16bits;
+ u16 set_mask;
+ u16 clr_mask;
u8 default_resolution;
u8 resolution_limits;
const u8 *resolutions;
unsigned int default_sample_time;
u8 num_sample_times;
const unsigned int *sample_times;
+ bool alarm;
};
/* Addresses scanned */
@@ -104,8 +109,8 @@ struct lm75_data {
struct i2c_client *client;
struct regmap *regmap;
struct regulator *vs;
- u8 orig_conf;
- u8 current_conf;
+ u16 orig_conf;
+ u16 current_conf;
u8 resolution; /* In bits, 9 to 16 */
unsigned int sample_time; /* In ms */
enum lm75_type kind;
@@ -128,6 +133,15 @@ static const struct lm75_params device_params[] = {
.default_resolution = 12,
.default_sample_time = MSEC_PER_SEC / 10,
},
+ [as6200] = {
+ .config_reg_16bits = true,
+ .set_mask = 0x94C0, /* 8 sample/s, 4 CF, positive polarity */
+ .default_resolution = 12,
+ .default_sample_time = 125,
+ .num_sample_times = 4,
+ .sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
+ .alarm = true,
+ },
[at30ts74] = {
.set_mask = 3 << 5, /* 12-bit mode*/
.default_resolution = 12,
@@ -255,8 +269,9 @@ static const struct lm75_params device_params[] = {
.resolutions = (u8 []) {9, 10, 11, 12 },
},
[tmp112] = {
- .set_mask = 3 << 5, /* 8 samples / second */
- .clr_mask = 1 << 7, /* no one-shot mode*/
+ .config_reg_16bits = true,
+ .set_mask = 0x60C0, /* 12-bit mode, 8 samples / second */
+ .clr_mask = 1 << 15, /* no one-shot mode*/
.default_resolution = 12,
.default_sample_time = 125,
.num_sample_times = 4,
@@ -317,20 +332,23 @@ static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
}
-static int lm75_write_config(struct lm75_data *data, u8 set_mask,
- u8 clr_mask)
+static int lm75_write_config(struct lm75_data *data, u16 set_mask,
+ u16 clr_mask)
{
- u8 value;
+ unsigned int value;
- clr_mask |= LM75_SHUTDOWN;
+ clr_mask |= LM75_SHUTDOWN << (8 * data->params->config_reg_16bits);
value = data->current_conf & ~clr_mask;
value |= set_mask;
if (data->current_conf != value) {
s32 err;
-
- err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF,
- value);
+ if (data->params->config_reg_16bits)
+ err = regmap_write(data->regmap, LM75_REG_CONF, value);
+ else
+ err = i2c_smbus_write_byte_data(data->client,
+ LM75_REG_CONF,
+ value);
if (err)
return err;
data->current_conf = value;
@@ -338,6 +356,27 @@ static int lm75_write_config(struct lm75_data *data, u8 set_mask,
return 0;
}
+static int lm75_read_config(struct lm75_data *data)
+{
+ int ret;
+ unsigned int status;
+
+ if (data->params->config_reg_16bits) {
+ ret = regmap_read(data->regmap, LM75_REG_CONF, &status);
+ return ret ? ret : status;
+ }
+
+ return i2c_smbus_read_byte_data(data->client, LM75_REG_CONF);
+}
+
+static irqreturn_t lm75_alarm_handler(int irq, void *private)
+{
+ struct device *hwmon_dev = private;
+
+ hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0);
+ return IRQ_HANDLED;
+}
+
static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
@@ -366,6 +405,9 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
case hwmon_temp_max_hyst:
reg = LM75_REG_HYST;
break;
+ case hwmon_temp_alarm:
+ reg = LM75_REG_CONF;
+ break;
default:
return -EINVAL;
}
@@ -373,7 +415,17 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
if (err < 0)
return err;
- *val = lm75_reg_to_mc(regval, data->resolution);
+ if (attr == hwmon_temp_alarm) {
+ switch (data->kind) {
+ case as6200:
+ *val = (regval >> 5) & 0x1;
+ break;
+ default:
+ return -EINVAL;
+ }
+ } else {
+ *val = lm75_reg_to_mc(regval, data->resolution);
+ }
break;
default:
return -EINVAL;
@@ -436,6 +488,7 @@ static int lm75_update_interval(struct device *dev, long val)
data->resolution = data->params->resolutions[index];
break;
case tmp112:
+ case as6200:
err = regmap_read(data->regmap, LM75_REG_CONF, &reg);
if (err < 0)
return err;
@@ -503,6 +556,10 @@ static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
case hwmon_temp_max:
case hwmon_temp_max_hyst:
return 0644;
+ case hwmon_temp_alarm:
+ if (config_data->params->alarm)
+ return 0444;
+ break;
}
break;
default:
@@ -515,7 +572,8 @@ static const struct hwmon_channel_info * const lm75_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
HWMON_CHANNEL_INFO(temp,
- HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
+ HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
+ HWMON_T_ALARM),
NULL
};
@@ -623,7 +681,7 @@ static int lm75_probe(struct i2c_client *client)
return err;
/* Cache original configuration */
- status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
+ status = lm75_read_config(data);
if (status < 0) {
dev_dbg(dev, "Can't read config? %d\n", status);
return status;
@@ -646,6 +704,23 @@ static int lm75_probe(struct i2c_client *client)
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
+ if (client->irq) {
+ if (data->params->alarm) {
+ err = devm_request_threaded_irq(dev,
+ client->irq,
+ NULL,
+ &lm75_alarm_handler,
+ IRQF_ONESHOT,
+ client->name,
+ hwmon_dev);
+ if (err)
+ return err;
+ } else {
+ /* alarm is only supported for chips with alarm bit */
+ dev_err(dev, "alarm interrupt is not supported\n");
+ }
+ }
+
dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name);
return 0;
@@ -653,6 +728,7 @@ static int lm75_probe(struct i2c_client *client)
static const struct i2c_device_id lm75_ids[] = {
{ "adt75", adt75, },
+ { "as6200", as6200, },
{ "at30ts74", at30ts74, },
{ "ds1775", ds1775, },
{ "ds75", ds75, },
@@ -690,6 +766,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
.data = (void *)adt75
},
{
+ .compatible = "ams,as6200",
+ .data = (void *)as6200
+ },
+ {
.compatible = "atmel,at30ts74",
.data = (void *)at30ts74
},
generated by cgit (git 2.34.1) at 2024-05-30 14:57:01 +0000