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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>
This commit is contained in:
Abdel Alkuor
Guenter Roeck
parent
de9c6033fb
commit
4b6358e1fe
@ -133,6 +133,16 @@ Supported chips:
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https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf
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* AMS OSRAM AS6200
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Prefix: 'as6200'
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Addresses scanned: none
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Datasheet: Publicly available at the AMS website
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https://ams.com/documents/20143/36005/AS6200_DS000449_4-00.pdf
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Author: Frodo Looijaard <frodol@dds.nl>
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Description
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@ -7,6 +7,7 @@
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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@ -24,6 +25,7 @@
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enum lm75_type { /* keep sorted in alphabetical order */
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adt75,
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as6200,
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at30ts74,
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ds1775,
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ds75,
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@ -54,6 +56,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
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/**
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* struct lm75_params - lm75 configuration parameters.
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* @config_reg_16bits: Configure register size is 2 bytes.
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* @set_mask: Bits to set in configuration register when configuring
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* the chip.
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* @clr_mask: Bits to clear in configuration register when configuring
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@ -74,17 +77,20 @@ enum lm75_type { /* keep sorted in alphabetical order */
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* @sample_times: All the possible sample times to be set. Mandatory if
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* num_sample_times is larger than 1. If set, number of
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* entries must match num_sample_times.
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* @alarm: Alarm bit is supported.
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*/
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struct lm75_params {
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u8 set_mask;
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u8 clr_mask;
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bool config_reg_16bits;
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u16 set_mask;
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u16 clr_mask;
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u8 default_resolution;
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u8 resolution_limits;
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const u8 *resolutions;
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unsigned int default_sample_time;
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u8 num_sample_times;
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const unsigned int *sample_times;
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bool alarm;
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};
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/* Addresses scanned */
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@ -103,8 +109,8 @@ struct lm75_data {
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struct i2c_client *client;
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struct regmap *regmap;
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struct regulator *vs;
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u8 orig_conf;
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u8 current_conf;
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u16 orig_conf;
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u16 current_conf;
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u8 resolution; /* In bits, 9 to 16 */
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unsigned int sample_time; /* In ms */
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enum lm75_type kind;
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@ -127,6 +133,15 @@ static const struct lm75_params device_params[] = {
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 10,
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},
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[as6200] = {
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.config_reg_16bits = true,
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.set_mask = 0x94C0, /* 8 sample/s, 4 CF, positive polarity */
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.default_resolution = 12,
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.default_sample_time = 125,
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.num_sample_times = 4,
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.sample_times = (unsigned int []){ 125, 250, 1000, 4000 },
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.alarm = true,
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},
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[at30ts74] = {
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.set_mask = 3 << 5, /* 12-bit mode*/
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.default_resolution = 12,
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@ -316,20 +331,23 @@ static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
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return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
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}
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static int lm75_write_config(struct lm75_data *data, u8 set_mask,
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u8 clr_mask)
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static int lm75_write_config(struct lm75_data *data, u16 set_mask,
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u16 clr_mask)
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{
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u8 value;
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unsigned int value;
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clr_mask |= LM75_SHUTDOWN;
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clr_mask |= LM75_SHUTDOWN << (8 * data->params->config_reg_16bits);
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value = data->current_conf & ~clr_mask;
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value |= set_mask;
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if (data->current_conf != value) {
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s32 err;
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err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF,
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value);
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if (data->params->config_reg_16bits)
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err = regmap_write(data->regmap, LM75_REG_CONF, value);
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else
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err = i2c_smbus_write_byte_data(data->client,
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LM75_REG_CONF,
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value);
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if (err)
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return err;
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data->current_conf = value;
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@ -337,6 +355,27 @@ static int lm75_write_config(struct lm75_data *data, u8 set_mask,
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return 0;
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}
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static int lm75_read_config(struct lm75_data *data)
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{
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int ret;
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unsigned int status;
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if (data->params->config_reg_16bits) {
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ret = regmap_read(data->regmap, LM75_REG_CONF, &status);
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return ret ? ret : status;
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}
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return i2c_smbus_read_byte_data(data->client, LM75_REG_CONF);
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}
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static irqreturn_t lm75_alarm_handler(int irq, void *private)
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{
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struct device *hwmon_dev = private;
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hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_alarm, 0);
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return IRQ_HANDLED;
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}
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static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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@ -365,6 +404,9 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
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case hwmon_temp_max_hyst:
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reg = LM75_REG_HYST;
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break;
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case hwmon_temp_alarm:
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reg = LM75_REG_CONF;
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break;
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default:
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return -EINVAL;
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}
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@ -372,7 +414,17 @@ static int lm75_read(struct device *dev, enum hwmon_sensor_types type,
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if (err < 0)
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return err;
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*val = lm75_reg_to_mc(regval, data->resolution);
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if (attr == hwmon_temp_alarm) {
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switch (data->kind) {
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case as6200:
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*val = (regval >> 5) & 0x1;
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break;
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default:
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return -EINVAL;
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}
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} else {
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*val = lm75_reg_to_mc(regval, data->resolution);
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}
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break;
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default:
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return -EINVAL;
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@ -435,6 +487,7 @@ static int lm75_update_interval(struct device *dev, long val)
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data->resolution = data->params->resolutions[index];
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break;
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case tmp112:
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case as6200:
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err = regmap_read(data->regmap, LM75_REG_CONF, ®);
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if (err < 0)
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return err;
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@ -502,6 +555,10 @@ static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
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case hwmon_temp_max:
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case hwmon_temp_max_hyst:
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return 0644;
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case hwmon_temp_alarm:
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if (config_data->params->alarm)
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return 0444;
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break;
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}
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break;
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default:
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@ -514,7 +571,8 @@ static const struct hwmon_channel_info * const lm75_info[] = {
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HWMON_CHANNEL_INFO(chip,
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HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST),
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HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
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HWMON_T_ALARM),
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NULL
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};
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@ -622,7 +680,7 @@ static int lm75_probe(struct i2c_client *client)
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return err;
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/* Cache original configuration */
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status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
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status = lm75_read_config(data);
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if (status < 0) {
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dev_dbg(dev, "Can't read config? %d\n", status);
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return status;
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@ -645,6 +703,23 @@ static int lm75_probe(struct i2c_client *client)
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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if (client->irq) {
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if (data->params->alarm) {
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err = devm_request_threaded_irq(dev,
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client->irq,
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NULL,
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&lm75_alarm_handler,
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IRQF_ONESHOT,
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client->name,
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hwmon_dev);
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if (err)
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return err;
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} else {
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/* alarm is only supported for chips with alarm bit */
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dev_err(dev, "alarm interrupt is not supported\n");
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}
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}
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dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name);
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return 0;
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@ -652,6 +727,7 @@ static int lm75_probe(struct i2c_client *client)
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static const struct i2c_device_id lm75_ids[] = {
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{ "adt75", adt75, },
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{ "as6200", as6200, },
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{ "at30ts74", at30ts74, },
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{ "ds1775", ds1775, },
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{ "ds75", ds75, },
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@ -688,6 +764,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
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.compatible = "adi,adt75",
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.data = (void *)adt75
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},
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{
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.compatible = "ams,as6200",
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.data = (void *)as6200
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},
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{
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.compatible = "atmel,at30ts74",
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.data = (void *)at30ts74
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