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Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c412
1 files changed, 298 insertions, 114 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 5b2ea05c951e..eda93a8c23c9 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -7,11 +7,12 @@
#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/i3c/device.h>
#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/regmap.h>
@@ -25,6 +26,7 @@
enum lm75_type { /* keep sorted in alphabetical order */
adt75,
+ as6200,
at30ts74,
ds1775,
ds75,
@@ -37,6 +39,8 @@ enum lm75_type { /* keep sorted in alphabetical order */
max6626,
max31725,
mcp980x,
+ p3t1750,
+ p3t1755,
pct2075,
stds75,
stlm75,
@@ -55,6 +59,7 @@ 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 +80,20 @@ 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 */
@@ -99,17 +107,15 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
#define LM75_REG_MAX 0x03
#define PCT2075_REG_IDLE 0x04
-/* Each client has this additional data */
struct lm75_data {
- struct i2c_client *client;
struct regmap *regmap;
- struct regulator *vs;
- u8 orig_conf;
- u8 current_conf;
+ u16 orig_conf;
u8 resolution; /* In bits, 9 to 16 */
unsigned int sample_time; /* In ms */
enum lm75_type kind;
const struct lm75_params *params;
+ u8 reg_buf[1];
+ u8 val_buf[3];
};
/*-----------------------------------------------------------------------*/
@@ -128,6 +134,15 @@ 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,
@@ -208,6 +223,20 @@ static const struct lm75_params device_params[] = {
.default_resolution = 9,
.default_sample_time = MSEC_PER_SEC / 18,
},
+ [p3t1750] = {
+ .clr_mask = 1 << 1 | 1 << 7, /* disable SMBAlert and one-shot */
+ .default_resolution = 12,
+ .default_sample_time = 55,
+ .num_sample_times = 4,
+ .sample_times = (unsigned int []){ 28, 55, 110, 220 },
+ },
+ [p3t1755] = {
+ .clr_mask = 1 << 1 | 1 << 7, /* disable SMBAlert and one-shot */
+ .default_resolution = 12,
+ .default_sample_time = 55,
+ .num_sample_times = 4,
+ .sample_times = (unsigned int []){ 28, 55, 110, 220 },
+ },
[pct2075] = {
.default_resolution = 11,
.default_sample_time = MSEC_PER_SEC / 10,
@@ -255,12 +284,14 @@ 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,
.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
+ .alarm = true,
},
[tmp175] = {
.set_mask = 3 << 5, /* 12-bit mode */
@@ -317,25 +348,19 @@ 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 inline int lm75_write_config(struct lm75_data *data, u16 set_mask,
+ u16 clr_mask)
{
- u8 value;
-
- clr_mask |= LM75_SHUTDOWN;
- value = data->current_conf & ~clr_mask;
- value |= set_mask;
+ return regmap_update_bits(data->regmap, LM75_REG_CONF,
+ clr_mask | LM75_SHUTDOWN, set_mask);
+}
- if (data->current_conf != value) {
- s32 err;
+static irqreturn_t lm75_alarm_handler(int irq, void *private)
+{
+ struct device *hwmon_dev = private;
- err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF,
- value);
- if (err)
- return err;
- data->current_conf = value;
- }
- return 0;
+ 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,
@@ -366,6 +391,9 @@ 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 +401,18 @@ 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:
+ case tmp112:
+ *val = (regval >> 13) & 0x1;
+ break;
+ default:
+ return -EINVAL;
+ }
+ } else {
+ *val = lm75_reg_to_mc(regval, data->resolution);
+ }
break;
default:
return -EINVAL;
@@ -417,7 +456,6 @@ static int lm75_write_temp(struct device *dev, u32 attr, long temp)
static int lm75_update_interval(struct device *dev, long val)
{
struct lm75_data *data = dev_get_drvdata(dev);
- unsigned int reg;
u8 index;
s32 err;
@@ -436,19 +474,15 @@ static int lm75_update_interval(struct device *dev, long val)
data->resolution = data->params->resolutions[index];
break;
case tmp112:
- err = regmap_read(data->regmap, LM75_REG_CONF, &reg);
- if (err < 0)
- return err;
- reg &= ~0x00c0;
- reg |= (3 - index) << 6;
- err = regmap_write(data->regmap, LM75_REG_CONF, reg);
+ case as6200:
+ err = regmap_update_bits(data->regmap, LM75_REG_CONF,
+ 0xc000, (3 - index) << 14);
if (err < 0)
return err;
data->sample_time = data->params->sample_times[index];
break;
case pct2075:
- err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE,
- index + 1);
+ err = regmap_write(data->regmap, PCT2075_REG_IDLE, index + 1);
if (err)
return err;
data->sample_time = data->params->sample_times[index];
@@ -503,6 +537,10 @@ 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 +553,8 @@ 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
};
@@ -540,6 +579,115 @@ static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg)
return reg == LM75_REG_TEMP || reg == LM75_REG_CONF;
}
+static int lm75_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct i2c_client *client = context;
+ struct lm75_data *data = i2c_get_clientdata(client);
+ int ret;
+
+ if (reg == LM75_REG_CONF) {
+ if (!data->params->config_reg_16bits)
+ ret = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
+ else
+ ret = i2c_smbus_read_word_data(client, LM75_REG_CONF);
+ } else {
+ ret = i2c_smbus_read_word_swapped(client, reg);
+ }
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return 0;
+}
+
+static int lm75_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct i2c_client *client = context;
+ struct lm75_data *data = i2c_get_clientdata(client);
+
+ if (reg == PCT2075_REG_IDLE ||
+ (reg == LM75_REG_CONF && !data->params->config_reg_16bits))
+ return i2c_smbus_write_byte_data(client, reg, val);
+ else if (reg == LM75_REG_CONF)
+ return i2c_smbus_write_word_data(client, reg, val);
+ return i2c_smbus_write_word_swapped(client, reg, val);
+}
+
+static const struct regmap_bus lm75_i2c_regmap_bus = {
+ .reg_read = lm75_i2c_reg_read,
+ .reg_write = lm75_i2c_reg_write,
+};
+
+static int lm75_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct i3c_device *i3cdev = context;
+ struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
+ struct i3c_xfer xfers[] = {
+ {
+ .rnw = false,
+ .len = 1,
+ .data.out = data->reg_buf,
+ },
+ {
+ .rnw = true,
+ .len = 2,
+ .data.in = data->val_buf,
+ },
+ };
+ int ret;
+
+ data->reg_buf[0] = reg;
+
+ if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
+ xfers[1].len--;
+
+ ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
+ if (ret < 0)
+ return ret;
+
+ if (reg == LM75_REG_CONF && !data->params->config_reg_16bits)
+ *val = data->val_buf[0];
+ else if (reg == LM75_REG_CONF)
+ *val = data->val_buf[0] | (data->val_buf[1] << 8);
+ else
+ *val = data->val_buf[1] | (data->val_buf[0] << 8);
+
+ return 0;
+}
+
+static int lm75_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct i3c_device *i3cdev = context;
+ struct lm75_data *data = i3cdev_get_drvdata(i3cdev);
+ struct i3c_xfer xfers[] = {
+ {
+ .rnw = false,
+ .len = 3,
+ .data.out = data->val_buf,
+ },
+ };
+
+ data->val_buf[0] = reg;
+
+ if (reg == PCT2075_REG_IDLE ||
+ (reg == LM75_REG_CONF && !data->params->config_reg_16bits)) {
+ xfers[0].len--;
+ data->val_buf[1] = val & 0xff;
+ } else if (reg == LM75_REG_CONF) {
+ data->val_buf[1] = val & 0xff;
+ data->val_buf[2] = (val >> 8) & 0xff;
+ } else {
+ data->val_buf[1] = (val >> 8) & 0xff;
+ data->val_buf[2] = val & 0xff;
+ }
+
+ return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
+}
+
+static const struct regmap_bus lm75_i3c_regmap_bus = {
+ .reg_read = lm75_i3c_reg_read,
+ .reg_write = lm75_i3c_reg_write,
+};
+
static const struct regmap_config lm75_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
@@ -552,54 +700,33 @@ static const struct regmap_config lm75_regmap_config = {
.use_single_write = true,
};
-static void lm75_disable_regulator(void *data)
-{
- struct lm75_data *lm75 = data;
-
- regulator_disable(lm75->vs);
-}
-
static void lm75_remove(void *data)
{
struct lm75_data *lm75 = data;
- struct i2c_client *client = lm75->client;
- i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf);
+ regmap_write(lm75->regmap, LM75_REG_CONF, lm75->orig_conf);
}
-static const struct i2c_device_id lm75_ids[];
-
-static int lm75_probe(struct i2c_client *client)
+static int lm75_generic_probe(struct device *dev, const char *name,
+ enum lm75_type kind, int irq, struct regmap *regmap)
{
- struct device *dev = &client->dev;
struct device *hwmon_dev;
struct lm75_data *data;
int status, err;
- enum lm75_type kind;
-
- if (client->dev.of_node)
- kind = (uintptr_t)of_device_get_match_data(&client->dev);
- else
- kind = i2c_match_id(lm75_ids, client)->driver_data;
-
- if (!i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
- return -EIO;
data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- data->client = client;
- data->kind = kind;
+ /* needed by custom regmap callbacks */
+ dev_set_drvdata(dev, data);
- data->vs = devm_regulator_get(dev, "vs");
- if (IS_ERR(data->vs))
- return PTR_ERR(data->vs);
+ data->kind = kind;
+ data->regmap = regmap;
- data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config);
- if (IS_ERR(data->regmap))
- return PTR_ERR(data->regmap);
+ err = devm_regulator_get_enable(dev, "vs");
+ if (err)
+ return err;
/* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
* Then tweak to be more precise when appropriate.
@@ -611,25 +738,11 @@ static int lm75_probe(struct i2c_client *client)
data->sample_time = data->params->default_sample_time;
data->resolution = data->params->default_resolution;
- /* Enable the power */
- err = regulator_enable(data->vs);
- if (err) {
- dev_err(dev, "failed to enable regulator: %d\n", err);
- return err;
- }
-
- err = devm_add_action_or_reset(dev, lm75_disable_regulator, data);
+ /* Cache original configuration */
+ err = regmap_read(data->regmap, LM75_REG_CONF, &status);
if (err)
return err;
-
- /* Cache original configuration */
- status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
- if (status < 0) {
- dev_dbg(dev, "Can't read config? %d\n", status);
- return status;
- }
data->orig_conf = status;
- data->current_conf = status;
err = lm75_write_config(data, data->params->set_mask,
data->params->clr_mask);
@@ -640,19 +753,53 @@ static int lm75_probe(struct i2c_client *client)
if (err)
return err;
- hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
- data, &lm75_chip_info,
- NULL);
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, name, data,
+ &lm75_chip_info, NULL);
if (IS_ERR(hwmon_dev))
return PTR_ERR(hwmon_dev);
- dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name);
+ if (irq) {
+ if (data->params->alarm) {
+ err = devm_request_threaded_irq(dev,
+ irq,
+ NULL,
+ &lm75_alarm_handler,
+ IRQF_ONESHOT,
+ 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), name);
return 0;
}
-static const struct i2c_device_id lm75_ids[] = {
+static int lm75_i2c_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct regmap *regmap;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
+ return -EOPNOTSUPP;
+
+ regmap = devm_regmap_init(dev, &lm75_i2c_regmap_bus, client, &lm75_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ return lm75_generic_probe(dev, client->name, (uintptr_t)i2c_get_match_data(client),
+ client->irq, regmap);
+}
+
+static const struct i2c_device_id lm75_i2c_ids[] = {
{ "adt75", adt75, },
+ { "as6200", as6200, },
{ "at30ts74", at30ts74, },
{ "ds1775", ds1775, },
{ "ds75", ds75, },
@@ -666,6 +813,8 @@ static const struct i2c_device_id lm75_ids[] = {
{ "max31725", max31725, },
{ "max31726", max31725, },
{ "mcp980x", mcp980x, },
+ { "p3t1750", p3t1750, },
+ { "p3t1755", p3t1755, },
{ "pct2075", pct2075, },
{ "stds75", stds75, },
{ "stlm75", stlm75, },
@@ -682,7 +831,38 @@ static const struct i2c_device_id lm75_ids[] = {
{ "tmp1075", tmp1075, },
{ /* LIST END */ }
};
-MODULE_DEVICE_TABLE(i2c, lm75_ids);
+MODULE_DEVICE_TABLE(i2c, lm75_i2c_ids);
+
+struct lm75_i3c_device {
+ enum lm75_type type;
+ const char *name;
+};
+
+static const struct lm75_i3c_device lm75_i3c_p3t1755 = {
+ .name = "p3t1755",
+ .type = p3t1755,
+};
+
+static const struct i3c_device_id lm75_i3c_ids[] = {
+ I3C_DEVICE(0x011b, 0x152a, &lm75_i3c_p3t1755),
+ { /* LIST END */ }
+};
+MODULE_DEVICE_TABLE(i3c, lm75_i3c_ids);
+
+static int lm75_i3c_probe(struct i3c_device *i3cdev)
+{
+ struct device *dev = i3cdev_to_dev(i3cdev);
+ const struct lm75_i3c_device *id_data;
+ struct regmap *regmap;
+
+ regmap = devm_regmap_init(dev, &lm75_i3c_regmap_bus, i3cdev, &lm75_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ id_data = i3c_device_match_id(i3cdev, lm75_i3c_ids)->data;
+
+ return lm75_generic_probe(dev, id_data->name, id_data->type, 0, regmap);
+}
static const struct of_device_id __maybe_unused lm75_of_match[] = {
{
@@ -690,6 +870,10 @@ 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
},
@@ -742,6 +926,14 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
.data = (void *)mcp980x
},
{
+ .compatible = "nxp,p3t1750",
+ .data = (void *)p3t1750
+ },
+ {
+ .compatible = "nxp,p3t1755",
+ .data = (void *)p3t1755
+ },
+ {
.compatible = "nxp,pct2075",
.data = (void *)pct2075
},
@@ -900,32 +1092,16 @@ static int lm75_detect(struct i2c_client *new_client,
#ifdef CONFIG_PM
static int lm75_suspend(struct device *dev)
{
- int status;
- struct i2c_client *client = to_i2c_client(dev);
+ struct lm75_data *data = dev_get_drvdata(dev);
- status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
- if (status < 0) {
- dev_dbg(&client->dev, "Can't read config? %d\n", status);
- return status;
- }
- status = status | LM75_SHUTDOWN;
- i2c_smbus_write_byte_data(client, LM75_REG_CONF, status);
- return 0;
+ return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, LM75_SHUTDOWN);
}
static int lm75_resume(struct device *dev)
{
- int status;
- struct i2c_client *client = to_i2c_client(dev);
+ struct lm75_data *data = dev_get_drvdata(dev);
- status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
- if (status < 0) {
- dev_dbg(&client->dev, "Can't read config? %d\n", status);
- return status;
- }
- status = status & ~LM75_SHUTDOWN;
- i2c_smbus_write_byte_data(client, LM75_REG_CONF, status);
- return 0;
+ return regmap_update_bits(data->regmap, LM75_REG_CONF, LM75_SHUTDOWN, 0);
}
static const struct dev_pm_ops lm75_dev_pm_ops = {
@@ -937,20 +1113,28 @@ static const struct dev_pm_ops lm75_dev_pm_ops = {
#define LM75_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
-static struct i2c_driver lm75_driver = {
+static struct i2c_driver lm75_i2c_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm75",
.of_match_table = of_match_ptr(lm75_of_match),
.pm = LM75_DEV_PM_OPS,
},
- .probe = lm75_probe,
- .id_table = lm75_ids,
+ .probe = lm75_i2c_probe,
+ .id_table = lm75_i2c_ids,
.detect = lm75_detect,
.address_list = normal_i2c,
};
-module_i2c_driver(lm75_driver);
+static struct i3c_driver lm75_i3c_driver = {
+ .driver = {
+ .name = "lm75_i3c",
+ },
+ .probe = lm75_i3c_probe,
+ .id_table = lm75_i3c_ids,
+};
+
+module_i3c_i2c_driver(lm75_i3c_driver, &lm75_i2c_driver)
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
MODULE_DESCRIPTION("LM75 driver");
generated by cgit (git 2.34.1) at 2025-12-24 22:39:37 +0000