diff options
author | Abdel Alkuor <alkuor@gmail.com> | 2023-12-23 19:21:59 +0300 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2024-01-02 19:44:57 +0300 |
commit | 4b6358e1fe4668e88cd654b345a2a62da9d373f7 (patch) | |
tree | 04282cfb8194687737bf3e05244b4351ce8ccbdc /drivers/hwmon/lm75.c | |
parent | de9c6033fb4de6013c5a4f6cc23b3b40c618cad2 (diff) | |
download | linux-4b6358e1fe4668e88cd654b345a2a62da9d373f7.tar.xz |
hwmon: (lm75) Add AMS AS6200 temperature sensor
as6200 is a temperature sensor with 0.0625°C resolution and a
range between -40°C to 125°C.
By default, the driver configures as6200 as following:
- Converstion rate: 8 Hz
- Conversion mode: continuous
- Consecutive fault counts: 4 samples
- Alert state: high polarity
- Alert mode: comparator mode
Interrupt is supported for the alert pin.
Signed-off-by: Abdel Alkuor <alkuor@gmail.com>
Link: https://lore.kernel.org/r/d1686678991bf8ee0d00cb08ca046798f37ca4b3.1703127334.git.alkuor@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r-- | drivers/hwmon/lm75.c | 108 |
1 files changed, 94 insertions, 14 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index dbabef2c2402..d3b0d8bf1654 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -7,6 +7,7 @@ #include <linux/module.h> #include <linux/init.h> +#include <linux/interrupt.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> @@ -24,6 +25,7 @@ enum lm75_type { /* keep sorted in alphabetical order */ adt75, + as6200, at30ts74, ds1775, ds75, @@ -54,6 +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 @@ -74,17 +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 */ @@ -103,8 +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; @@ -127,6 +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, @@ -316,20 +331,23 @@ 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; @@ -337,6 +355,27 @@ 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) { @@ -365,6 +404,9 @@ 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; } @@ -372,7 +414,17 @@ 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; @@ -435,6 +487,7 @@ 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, ®); if (err < 0) return err; @@ -502,6 +555,10 @@ 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: @@ -514,7 +571,8 @@ 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 }; @@ -622,7 +680,7 @@ 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; @@ -645,6 +703,23 @@ 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; @@ -652,6 +727,7 @@ 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, }, @@ -689,6 +765,10 @@ 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 }, |