diff options
Diffstat (limited to 'drivers/iio/chemical/vz89x.c')
| -rw-r--r-- | drivers/iio/chemical/vz89x.c | 80 |
1 files changed, 62 insertions, 18 deletions
diff --git a/drivers/iio/chemical/vz89x.c b/drivers/iio/chemical/vz89x.c index 652649da500f..aa6ebc084e19 100644 --- a/drivers/iio/chemical/vz89x.c +++ b/drivers/iio/chemical/vz89x.c @@ -19,25 +19,45 @@ #include <linux/mutex.h> #include <linux/init.h> #include <linux/i2c.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #define VZ89X_REG_MEASUREMENT 0x09 -#define VZ89X_REG_MEASUREMENT_SIZE 6 +#define VZ89X_REG_MEASUREMENT_RD_SIZE 6 +#define VZ89X_REG_MEASUREMENT_WR_SIZE 3 #define VZ89X_VOC_CO2_IDX 0 #define VZ89X_VOC_SHORT_IDX 1 #define VZ89X_VOC_TVOC_IDX 2 #define VZ89X_VOC_RESISTANCE_IDX 3 +enum { + VZ89X, +}; + +struct vz89x_chip_data; + struct vz89x_data { struct i2c_client *client; + const struct vz89x_chip_data *chip; struct mutex lock; int (*xfer)(struct vz89x_data *data, u8 cmd); unsigned long last_update; - u8 buffer[VZ89X_REG_MEASUREMENT_SIZE]; + u8 buffer[VZ89X_REG_MEASUREMENT_RD_SIZE]; +}; + +struct vz89x_chip_data { + bool (*valid)(struct vz89x_data *data); + const struct iio_chan_spec *channels; + u8 num_channels; + + u8 cmd; + u8 read_size; + u8 write_size; }; static const struct iio_chan_spec vz89x_channels[] = { @@ -93,16 +113,17 @@ static const struct attribute_group vz89x_attrs_group = { * always zero, and by also confirming the VOC_short isn't zero. */ -static int vz89x_measurement_is_valid(struct vz89x_data *data) +static bool vz89x_measurement_is_valid(struct vz89x_data *data) { if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0) return 1; - return !!(data->buffer[VZ89X_REG_MEASUREMENT_SIZE - 1] > 0); + return !!(data->buffer[data->chip->read_size - 1] > 0); } static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd) { + const struct vz89x_chip_data *chip = data->chip; struct i2c_client *client = data->client; struct i2c_msg msg[2]; int ret; @@ -110,12 +131,12 @@ static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd) msg[0].addr = client->addr; msg[0].flags = client->flags; - msg[0].len = 3; + msg[0].len = chip->write_size; msg[0].buf = (char *) &buf; msg[1].addr = client->addr; msg[1].flags = client->flags | I2C_M_RD; - msg[1].len = VZ89X_REG_MEASUREMENT_SIZE; + msg[1].len = chip->read_size; msg[1].buf = (char *) &data->buffer; ret = i2c_transfer(client->adapter, msg, 2); @@ -133,7 +154,7 @@ static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd) if (ret < 0) return ret; - for (i = 0; i < VZ89X_REG_MEASUREMENT_SIZE; i++) { + for (i = 0; i < data->chip->read_size; i++) { ret = i2c_smbus_read_byte(client); if (ret < 0) return ret; @@ -145,17 +166,18 @@ static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd) static int vz89x_get_measurement(struct vz89x_data *data) { + const struct vz89x_chip_data *chip = data->chip; int ret; /* sensor can only be polled once a second max per datasheet */ if (!time_after(jiffies, data->last_update + HZ)) return 0; - ret = data->xfer(data, VZ89X_REG_MEASUREMENT); + ret = data->xfer(data, chip->cmd); if (ret < 0) return ret; - ret = vz89x_measurement_is_valid(data); + ret = chip->valid(data); if (ret) return -EAGAIN; @@ -232,11 +254,32 @@ static const struct iio_info vz89x_info = { .driver_module = THIS_MODULE, }; +static const struct vz89x_chip_data vz89x_chips[] = { + { + .valid = vz89x_measurement_is_valid, + + .cmd = VZ89X_REG_MEASUREMENT, + .read_size = VZ89X_REG_MEASUREMENT_RD_SIZE, + .write_size = VZ89X_REG_MEASUREMENT_WR_SIZE, + + .channels = vz89x_channels, + .num_channels = ARRAY_SIZE(vz89x_channels), + }, +}; + +static const struct of_device_id vz89x_dt_ids[] = { + { .compatible = "sgx,vz89x", .data = (void *) VZ89X }, + { } +}; +MODULE_DEVICE_TABLE(of, vz89x_dt_ids); + static int vz89x_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct iio_dev *indio_dev; struct vz89x_data *data; + const struct of_device_id *of_id; + int chip_id; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) @@ -251,8 +294,15 @@ static int vz89x_probe(struct i2c_client *client, else return -EOPNOTSUPP; + of_id = of_match_device(vz89x_dt_ids, &client->dev); + if (!of_id) + chip_id = id->driver_data; + else + chip_id = (unsigned long)of_id->data; + i2c_set_clientdata(client, indio_dev); data->client = client; + data->chip = &vz89x_chips[chip_id]; data->last_update = jiffies - HZ; mutex_init(&data->lock); @@ -261,24 +311,18 @@ static int vz89x_probe(struct i2c_client *client, indio_dev->name = dev_name(&client->dev); indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = vz89x_channels; - indio_dev->num_channels = ARRAY_SIZE(vz89x_channels); + indio_dev->channels = data->chip->channels; + indio_dev->num_channels = data->chip->num_channels; return devm_iio_device_register(&client->dev, indio_dev); } static const struct i2c_device_id vz89x_id[] = { - { "vz89x", 0 }, + { "vz89x", VZ89X }, { } }; MODULE_DEVICE_TABLE(i2c, vz89x_id); -static const struct of_device_id vz89x_dt_ids[] = { - { .compatible = "sgx,vz89x" }, - { } -}; -MODULE_DEVICE_TABLE(of, vz89x_dt_ids); - static struct i2c_driver vz89x_driver = { .driver = { .name = "vz89x", |