drivers: add mutex to the i2c-gpio driver. (5a681351) · Commits · Wenxi XU / zephyr

drivers/i2c/i2c_gpio.c

+34 −6

Original line number	Diff line number	Diff line
		@@ -21,9 +21,9 @@
		* When the SDA pin is read it must return the state of the physical hardware
		* line, not just the last state written to it for output.
		*
		* The SCL pin should be configured in the same manner as SDA, or, if it is known
		* that the hardware attached to pin doesn't attempt clock stretching, then the
		* SCL pin may be a push/pull output.
		* The SCL pin should be configured in the same manner as SDA, or, if it is
		* known that the hardware attached to pin doesn't attempt clock stretching,
		* then the SCL pin may be a push/pull output.
		*/

		#include <zephyr/device.h>
		@@ -47,6 +47,7 @@ struct i2c_gpio_config {
		/* Driver instance data */
		struct i2c_gpio_context {
		struct i2c_bitbang bitbang; /* Bit-bang library data */
		struct k_mutex mutex;
		};

		static void i2c_gpio_set_scl(void *io_context, int state)
		@@ -81,24 +82,45 @@ static const struct i2c_bitbang_io io_fns = {
		static int i2c_gpio_configure(const struct device *dev, uint32_t dev_config)
		{
		struct i2c_gpio_context *context = dev->data;
		int rc;

		return i2c_bitbang_configure(&context->bitbang, dev_config);
		k_mutex_lock(&context->mutex, K_FOREVER);

		rc = i2c_bitbang_configure(&context->bitbang, dev_config);

		k_mutex_unlock(&context->mutex);

		return rc;
		}

		static int i2c_gpio_transfer(const struct device dev, struct i2c_msg msgs,
		uint8_t num_msgs, uint16_t slave_address)
		{
		struct i2c_gpio_context *context = dev->data;
		int rc;

		k_mutex_lock(&context->mutex, K_FOREVER);

		return i2c_bitbang_transfer(&context->bitbang, msgs, num_msgs,
		rc = i2c_bitbang_transfer(&context->bitbang, msgs, num_msgs,
		slave_address);

		k_mutex_unlock(&context->mutex);

		return rc;
		}

		static int i2c_gpio_recover_bus(const struct device *dev)
		{
		struct i2c_gpio_context *context = dev->data;
		int rc;

		k_mutex_lock(&context->mutex, K_FOREVER);

		return i2c_bitbang_recover_bus(&context->bitbang);
		rc = i2c_bitbang_recover_bus(&context->bitbang);

		k_mutex_unlock(&context->mutex);

		return rc;
		}

		static struct i2c_driver_api api = {
		@@ -151,6 +173,12 @@ static int i2c_gpio_init(const struct device *dev)
		return err;
		}

		err = k_mutex_init(&context->mutex);
		if (err) {
		LOG_ERR("Failed to create the i2c lock mutex : %d", err);
		return err;
		}

		return 0;
		}

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