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-rw-r--r--drivers/iio/chemical/atlas-sensor.c29
-rw-r--r--drivers/iio/chemical/ccs811.c112
2 files changed, 130 insertions, 11 deletions
diff --git a/drivers/iio/chemical/atlas-sensor.c b/drivers/iio/chemical/atlas-sensor.c
index 973cdb4f1e83..a6d996ab9a66 100644
--- a/drivers/iio/chemical/atlas-sensor.c
+++ b/drivers/iio/chemical/atlas-sensor.c
@@ -53,6 +53,8 @@
#define ATLAS_REG_DO_CALIB_STATUS_PRESSURE BIT(0)
#define ATLAS_REG_DO_CALIB_STATUS_DO BIT(1)
+#define ATLAS_REG_RTD_DATA 0x0e
+
#define ATLAS_REG_PH_TEMP_DATA 0x0e
#define ATLAS_REG_PH_DATA 0x16
@@ -72,12 +74,14 @@
#define ATLAS_EC_INT_TIME_IN_MS 650
#define ATLAS_ORP_INT_TIME_IN_MS 450
#define ATLAS_DO_INT_TIME_IN_MS 450
+#define ATLAS_RTD_INT_TIME_IN_MS 450
enum {
ATLAS_PH_SM,
ATLAS_EC_SM,
ATLAS_ORP_SM,
ATLAS_DO_SM,
+ ATLAS_RTD_SM,
};
struct atlas_data {
@@ -206,6 +210,22 @@ static const struct iio_chan_spec atlas_do_channels[] = {
},
};
+static const struct iio_chan_spec atlas_rtd_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .address = ATLAS_REG_RTD_DATA,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
static int atlas_check_ph_calibration(struct atlas_data *data)
{
struct device *dev = &data->client->dev;
@@ -350,6 +370,12 @@ static struct atlas_device atlas_devices[] = {
.calibration = &atlas_check_do_calibration,
.delay = ATLAS_DO_INT_TIME_IN_MS,
},
+ [ATLAS_RTD_SM] = {
+ .channels = atlas_rtd_channels,
+ .num_channels = 2,
+ .data_reg = ATLAS_REG_RTD_DATA,
+ .delay = ATLAS_RTD_INT_TIME_IN_MS,
+ },
};
static int atlas_set_powermode(struct atlas_data *data, int on)
@@ -477,6 +503,7 @@ static int atlas_read_raw(struct iio_dev *indio_dev,
struct atlas_data *data = iio_priv(indio_dev);
switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
case IIO_CHAN_INFO_RAW: {
int ret;
__be32 reg;
@@ -565,6 +592,7 @@ static const struct i2c_device_id atlas_id[] = {
{ "atlas-ec-sm", ATLAS_EC_SM},
{ "atlas-orp-sm", ATLAS_ORP_SM},
{ "atlas-do-sm", ATLAS_DO_SM},
+ { "atlas-rtd-sm", ATLAS_RTD_SM},
{}
};
MODULE_DEVICE_TABLE(i2c, atlas_id);
@@ -574,6 +602,7 @@ static const struct of_device_id atlas_dt_ids[] = {
{ .compatible = "atlas,ec-sm", .data = (void *)ATLAS_EC_SM, },
{ .compatible = "atlas,orp-sm", .data = (void *)ATLAS_ORP_SM, },
{ .compatible = "atlas,do-sm", .data = (void *)ATLAS_DO_SM, },
+ { .compatible = "atlas,rtd-sm", .data = (void *)ATLAS_RTD_SM, },
{ }
};
MODULE_DEVICE_TABLE(of, atlas_dt_ids);
diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c
index 2ebdfc35bcda..3ecd633f9ed3 100644
--- a/drivers/iio/chemical/ccs811.c
+++ b/drivers/iio/chemical/ccs811.c
@@ -16,6 +16,7 @@
*/
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
@@ -36,6 +37,7 @@
#define CCS811_ERR 0xE0
/* Used to transition from boot to application mode */
#define CCS811_APP_START 0xF4
+#define CCS811_SW_RESET 0xFF
/* Status register flags */
#define CCS811_STATUS_ERROR BIT(0)
@@ -74,6 +76,7 @@ struct ccs811_data {
struct mutex lock; /* Protect readings */
struct ccs811_reading buffer;
struct iio_trigger *drdy_trig;
+ struct gpio_desc *wakeup_gpio;
bool drdy_trig_on;
};
@@ -166,10 +169,25 @@ static int ccs811_setup(struct i2c_client *client)
CCS811_MODE_IAQ_1SEC);
}
+static void ccs811_set_wakeup(struct ccs811_data *data, bool enable)
+{
+ if (!data->wakeup_gpio)
+ return;
+
+ gpiod_set_value(data->wakeup_gpio, enable);
+
+ if (enable)
+ usleep_range(50, 60);
+ else
+ usleep_range(20, 30);
+}
+
static int ccs811_get_measurement(struct ccs811_data *data)
{
int ret, tries = 11;
+ ccs811_set_wakeup(data, true);
+
/* Maximum waiting time: 1s, as measurements are made every second */
while (tries-- > 0) {
ret = i2c_smbus_read_byte_data(data->client, CCS811_STATUS);
@@ -183,9 +201,12 @@ static int ccs811_get_measurement(struct ccs811_data *data)
if (!(ret & CCS811_STATUS_DATA_READY))
return -EIO;
- return i2c_smbus_read_i2c_block_data(data->client,
+ ret = i2c_smbus_read_i2c_block_data(data->client,
CCS811_ALG_RESULT_DATA, 8,
(char *)&data->buffer);
+ ccs811_set_wakeup(data, false);
+
+ return ret;
}
static int ccs811_read_raw(struct iio_dev *indio_dev,
@@ -336,6 +357,45 @@ static irqreturn_t ccs811_data_rdy_trigger_poll(int irq, void *private)
return IRQ_HANDLED;
}
+static int ccs811_reset(struct i2c_client *client)
+{
+ struct gpio_desc *reset_gpio;
+ int ret;
+
+ reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ /* Try to reset using nRESET pin if available else do SW reset */
+ if (reset_gpio) {
+ gpiod_set_value(reset_gpio, 1);
+ usleep_range(20, 30);
+ gpiod_set_value(reset_gpio, 0);
+ } else {
+ /*
+ * As per the datasheet, this sequence of values needs to be
+ * written to the SW_RESET register for triggering the soft
+ * reset in the device and placing it in boot mode.
+ */
+ static const u8 reset_seq[] = {
+ 0x11, 0xE5, 0x72, 0x8A,
+ };
+
+ ret = i2c_smbus_write_i2c_block_data(client, CCS811_SW_RESET,
+ sizeof(reset_seq), reset_seq);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to reset sensor\n");
+ return ret;
+ }
+ }
+
+ /* tSTART delay required after reset */
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
static int ccs811_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -348,36 +408,59 @@ static int ccs811_probe(struct i2c_client *client,
| I2C_FUNC_SMBUS_READ_I2C_BLOCK))
return -EOPNOTSUPP;
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ data->wakeup_gpio = devm_gpiod_get_optional(&client->dev, "wakeup",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->wakeup_gpio))
+ return PTR_ERR(data->wakeup_gpio);
+
+ ccs811_set_wakeup(data, true);
+
+ ret = ccs811_reset(client);
+ if (ret) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
/* Check hardware id (should be 0x81 for this family of devices) */
ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
- if (ret < 0)
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
return ret;
+ }
if (ret != CCS811_HW_ID_VALUE) {
dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
+ ccs811_set_wakeup(data, false);
return -ENODEV;
}
ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
- if (ret < 0)
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
return ret;
+ }
if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
dev_err(&client->dev, "no CCS811 sensor\n");
+ ccs811_set_wakeup(data, false);
return -ENODEV;
}
- indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
- if (!indio_dev)
- return -ENOMEM;
-
ret = ccs811_setup(client);
- if (ret < 0)
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
return ret;
+ }
- data = iio_priv(indio_dev);
- i2c_set_clientdata(client, indio_dev);
- data->client = client;
+ ccs811_set_wakeup(data, false);
mutex_init(&data->lock);
@@ -466,9 +549,16 @@ static const struct i2c_device_id ccs811_id[] = {
};
MODULE_DEVICE_TABLE(i2c, ccs811_id);
+static const struct of_device_id ccs811_dt_ids[] = {
+ { .compatible = "ams,ccs811" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ccs811_dt_ids);
+
static struct i2c_driver ccs811_driver = {
.driver = {
.name = "ccs811",
+ .of_match_table = ccs811_dt_ids,
},
.probe = ccs811_probe,
.remove = ccs811_remove,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 19:22:25 +0000