diff options
Diffstat (limited to 'drivers/iio/humidity/dht11.c')
| -rw-r--r-- | drivers/iio/humidity/dht11.c | 63 |
1 files changed, 20 insertions, 43 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c index 1a9f8f4ffb88..980cb946bbf7 100644 --- a/drivers/iio/humidity/dht11.c +++ b/drivers/iio/humidity/dht11.c @@ -1,17 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * DHT11/DHT22 bit banging GPIO driver * * Copyright (c) Harald Geyer <harald@ccbib.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/err.h> @@ -20,10 +11,10 @@ #include <linux/kernel.h> #include <linux/printk.h> #include <linux/slab.h> -#include <linux/of.h> -#include <linux/of_device.h> +#include <linux/string_choices.h> #include <linux/sysfs.h> #include <linux/io.h> +#include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/wait.h> @@ -31,14 +22,11 @@ #include <linux/completion.h> #include <linux/mutex.h> #include <linux/delay.h> -#include <linux/gpio.h> -#include <linux/of_gpio.h> +#include <linux/gpio/consumer.h> #include <linux/timekeeping.h> #include <linux/iio/iio.h> -#define DRIVER_NAME "dht11" - #define DHT11_DATA_VALID_TIME 2000000000 /* 2s in ns */ #define DHT11_EDGES_PREAMBLE 2 @@ -81,7 +69,7 @@ struct dht11 { struct device *dev; - int gpio; + struct gpio_desc *gpiod; int irq; struct completion completion; @@ -110,7 +98,7 @@ static void dht11_edges_print(struct dht11 *dht11) for (i = 1; i < dht11->num_edges; ++i) { dev_dbg(dht11->dev, "%d: %lld ns %s\n", i, dht11->edges[i].ts - dht11->edges[i - 1].ts, - dht11->edges[i - 1].value ? "high" : "low"); + str_high_low(dht11->edges[i - 1].value)); } } #endif /* CONFIG_DYNAMIC_DEBUG */ @@ -158,7 +146,7 @@ static int dht11_decode(struct dht11 *dht11, int offset) return -EIO; } - dht11->timestamp = ktime_get_boot_ns(); + dht11->timestamp = ktime_get_boottime_ns(); if (hum_int < 4) { /* DHT22: 100000 = (3*256+232)*100 */ dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) * ((temp_int & 0x80) ? -100 : 100); @@ -184,11 +172,10 @@ 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 = ktime_get_boot_ns(); + dht11->edges[dht11->num_edges].ts = ktime_get_boottime_ns(); dht11->edges[dht11->num_edges++].value = - gpio_get_value(dht11->gpio); + gpiod_get_value(dht11->gpiod); if (dht11->num_edges >= DHT11_EDGES_PER_READ) complete(&dht11->completion); @@ -205,7 +192,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, int ret, timeres, offset; mutex_lock(&dht11->lock); - if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_boot_ns()) { + if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_boottime_ns()) { timeres = ktime_get_resolution_ns(); dev_dbg(dht11->dev, "current timeresolution: %dns\n", timeres); if (timeres > DHT11_MIN_TIMERES) { @@ -226,12 +213,12 @@ static int dht11_read_raw(struct iio_dev *iio_dev, reinit_completion(&dht11->completion); dht11->num_edges = 0; - ret = gpio_direction_output(dht11->gpio, 0); + ret = gpiod_direction_output(dht11->gpiod, 0); if (ret) goto err; usleep_range(DHT11_START_TRANSMISSION_MIN, DHT11_START_TRANSMISSION_MAX); - ret = gpio_direction_input(dht11->gpio); + ret = gpiod_direction_input(dht11->gpiod); if (ret) goto err; @@ -303,35 +290,26 @@ MODULE_DEVICE_TABLE(of, dht11_dt_ids); static int dht11_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; - struct device_node *node = dev->of_node; struct dht11 *dht11; struct iio_dev *iio; - int ret; iio = devm_iio_device_alloc(dev, sizeof(*dht11)); - if (!iio) { - dev_err(dev, "Failed to allocate IIO device\n"); + if (!iio) return -ENOMEM; - } dht11 = iio_priv(iio); dht11->dev = dev; + dht11->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN); + if (IS_ERR(dht11->gpiod)) + return PTR_ERR(dht11->gpiod); - ret = of_get_gpio(node, 0); - if (ret < 0) - return ret; - dht11->gpio = ret; - ret = devm_gpio_request_one(dev, dht11->gpio, GPIOF_IN, pdev->name); - if (ret) - return ret; - - dht11->irq = gpio_to_irq(dht11->gpio); + dht11->irq = gpiod_to_irq(dht11->gpiod); if (dht11->irq < 0) { - dev_err(dev, "GPIO %d has no interrupt\n", dht11->gpio); + dev_err(dev, "GPIO %d has no interrupt\n", desc_to_gpio(dht11->gpiod)); return -EINVAL; } - dht11->timestamp = ktime_get_boot_ns() - DHT11_DATA_VALID_TIME - 1; + dht11->timestamp = ktime_get_boottime_ns() - DHT11_DATA_VALID_TIME - 1; dht11->num_edges = -1; platform_set_drvdata(pdev, iio); @@ -339,7 +317,6 @@ static int dht11_probe(struct platform_device *pdev) init_completion(&dht11->completion); mutex_init(&dht11->lock); iio->name = pdev->name; - iio->dev.parent = &pdev->dev; iio->info = &dht11_iio_info; iio->modes = INDIO_DIRECT_MODE; iio->channels = dht11_chan_spec; @@ -350,7 +327,7 @@ static int dht11_probe(struct platform_device *pdev) static struct platform_driver dht11_driver = { .driver = { - .name = DRIVER_NAME, + .name = "dht11", .of_match_table = dht11_dt_ids, }, .probe = dht11_probe, |