diff options
Diffstat (limited to 'drivers/iio/humidity')
| -rw-r--r-- | drivers/iio/humidity/dht11.c | 69 | ||||
| -rw-r--r-- | drivers/iio/humidity/si7020.c | 6 |
2 files changed, 44 insertions, 31 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c index 623c145d8a97..7d79a1ac5f5f 100644 --- a/drivers/iio/humidity/dht11.c +++ b/drivers/iio/humidity/dht11.c @@ -29,6 +29,7 @@ #include <linux/wait.h> #include <linux/bitops.h> #include <linux/completion.h> +#include <linux/mutex.h> #include <linux/delay.h> #include <linux/gpio.h> #include <linux/of_gpio.h> @@ -39,8 +40,12 @@ #define DHT11_DATA_VALID_TIME 2000000000 /* 2s in ns */ -#define DHT11_EDGES_PREAMBLE 4 +#define DHT11_EDGES_PREAMBLE 2 #define DHT11_BITS_PER_READ 40 +/* + * Note that when reading the sensor actually 84 edges are detected, but + * since the last edge is not significant, we only store 83: + */ #define DHT11_EDGES_PER_READ (2*DHT11_BITS_PER_READ + DHT11_EDGES_PREAMBLE + 1) /* Data transmission timing (nano seconds) */ @@ -57,6 +62,7 @@ struct dht11 { int irq; struct completion completion; + struct mutex lock; s64 timestamp; int temperature; @@ -88,7 +94,7 @@ static int dht11_decode(struct dht11 *dht11, int offset) unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum; /* Calculate timestamp resolution */ - for (i = 0; i < dht11->num_edges; ++i) { + for (i = 1; i < dht11->num_edges; ++i) { t = dht11->edges[i].ts - dht11->edges[i-1].ts; if (t > 0 && t < timeres) timeres = t; @@ -138,6 +144,27 @@ static int dht11_decode(struct dht11 *dht11, int offset) return 0; } +/* + * IRQ handler called on GPIO edges + */ +static irqreturn_t dht11_handle_irq(int irq, void *data) +{ + struct iio_dev *iio = data; + struct dht11 *dht11 = iio_priv(iio); + + /* TODO: Consider making the handler safe for IRQ sharing */ + if (dht11->num_edges < DHT11_EDGES_PER_READ && dht11->num_edges >= 0) { + dht11->edges[dht11->num_edges].ts = iio_get_time_ns(); + dht11->edges[dht11->num_edges++].value = + gpio_get_value(dht11->gpio); + + if (dht11->num_edges >= DHT11_EDGES_PER_READ) + complete(&dht11->completion); + } + + return IRQ_HANDLED; +} + static int dht11_read_raw(struct iio_dev *iio_dev, const struct iio_chan_spec *chan, int *val, int *val2, long m) @@ -145,6 +172,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, struct dht11 *dht11 = iio_priv(iio_dev); int ret; + mutex_lock(&dht11->lock); if (dht11->timestamp + DHT11_DATA_VALID_TIME < iio_get_time_ns()) { reinit_completion(&dht11->completion); @@ -157,8 +185,17 @@ static int dht11_read_raw(struct iio_dev *iio_dev, if (ret) goto err; + ret = request_irq(dht11->irq, dht11_handle_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + iio_dev->name, iio_dev); + if (ret) + goto err; + ret = wait_for_completion_killable_timeout(&dht11->completion, HZ); + + free_irq(dht11->irq, iio_dev); + if (ret == 0 && dht11->num_edges < DHT11_EDGES_PER_READ - 1) { dev_err(&iio_dev->dev, "Only %d signal edges detected\n", @@ -185,6 +222,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, ret = -EINVAL; err: dht11->num_edges = -1; + mutex_unlock(&dht11->lock); return ret; } @@ -193,27 +231,6 @@ static const struct iio_info dht11_iio_info = { .read_raw = dht11_read_raw, }; -/* - * IRQ handler called on GPIO edges -*/ -static irqreturn_t dht11_handle_irq(int irq, void *data) -{ - struct iio_dev *iio = data; - struct dht11 *dht11 = iio_priv(iio); - - /* TODO: Consider making the handler safe for IRQ sharing */ - if (dht11->num_edges < DHT11_EDGES_PER_READ && dht11->num_edges >= 0) { - dht11->edges[dht11->num_edges].ts = iio_get_time_ns(); - dht11->edges[dht11->num_edges++].value = - gpio_get_value(dht11->gpio); - - if (dht11->num_edges >= DHT11_EDGES_PER_READ) - complete(&dht11->completion); - } - - return IRQ_HANDLED; -} - static const struct iio_chan_spec dht11_chan_spec[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), }, @@ -256,11 +273,6 @@ static int dht11_probe(struct platform_device *pdev) dev_err(dev, "GPIO %d has no interrupt\n", dht11->gpio); return -EINVAL; } - ret = devm_request_irq(dev, dht11->irq, dht11_handle_irq, - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, - pdev->name, iio); - if (ret) - return ret; dht11->timestamp = iio_get_time_ns() - DHT11_DATA_VALID_TIME - 1; dht11->num_edges = -1; @@ -268,6 +280,7 @@ static int dht11_probe(struct platform_device *pdev) platform_set_drvdata(pdev, iio); init_completion(&dht11->completion); + mutex_init(&dht11->lock); iio->name = pdev->name; iio->dev.parent = &pdev->dev; iio->info = &dht11_iio_info; diff --git a/drivers/iio/humidity/si7020.c b/drivers/iio/humidity/si7020.c index b54164677b89..fa3b809aff5e 100644 --- a/drivers/iio/humidity/si7020.c +++ b/drivers/iio/humidity/si7020.c @@ -45,12 +45,12 @@ static int si7020_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { - struct i2c_client *client = iio_priv(indio_dev); + struct i2c_client **client = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: - ret = i2c_smbus_read_word_data(client, + ret = i2c_smbus_read_word_data(*client, chan->type == IIO_TEMP ? SI7020CMD_TEMP_HOLD : SI7020CMD_RH_HOLD); @@ -126,7 +126,7 @@ static int si7020_probe(struct i2c_client *client, /* Wait the maximum power-up time after software reset. */ msleep(15); - indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*client)); + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; |