iio: proximity: vl53l0x-i2c: claim direct mode for raw readsgrafted

vl53l0x_read_raw() starts a single-shot ranging measurement and reads
back the result. Once the triggered buffer is enabled the sensor runs in
continuous mode and its data-ready interrupt is routed to the trigger,
so a concurrent in_distance_raw read disturbs the streaming setup and
never gets its completion, returning -ETIMEDOUT.

The original submission claimed direct mode here, but it was dropped
during review because the driver had no buffer support at the time [1].
Continuous (buffered) mode was later added without restoring the
claim [2], reintroducing the conflict.

Reject direct reads while buffered capture is active by claiming direct
mode around the measurement, as the vl53l1x sibling already does.

Fixes: 762186c6e7b1 ("iio: proximity: vl53l0x-i2c: Added continuous mode support")
Link: https://lore.kernel.org/linux-iio/20180911160300.GA9212@himanshu-Vostro-3559/ [1]
Link: https://lore.kernel.org/linux-iio/20240909101508.263085-3-abhashkumarjha123@gmail.com/ [2]
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/include/sound/seq_device.h b/include/sound/seq_device.h
new file mode 100644
index 000000000..3137d4c5f
--- /dev/null
+++ b/include/sound/seq_device.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __SOUND_SEQ_DEVICE_H
+#define __SOUND_SEQ_DEVICE_H
+
+/*
+ *  ALSA sequencer device management
+ *  Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
+ */
+
+/*
+ * registered device information
+ */
+
+struct snd_seq_device {
+	/* device info */
+	struct snd_card *card;	/* sound card */
+	int device;		/* device number */
+	const char *id;		/* driver id */
+	char name[80];		/* device name */
+	int argsize;		/* size of the argument */
+	void *driver_data;	/* private data for driver */
+	void *private_data;	/* private data for the caller */
+	void (*private_free)(struct snd_seq_device *device);
+	struct device dev;
+	unsigned char args[];	/* driver-specific argument */
+};
+
+#define to_seq_dev(_dev) \
+	container_of(_dev, struct snd_seq_device, dev)
+
+/* sequencer driver */
+
+/* driver operators
+ * probe:
+ *	Initialize the device with given parameters.
+ *	Typically,
+ *		1. call snd_hwdep_new
+ *		2. allocate private data and initialize it
+ *		3. call snd_hwdep_register
+ *		4. store the instance to dev->driver_data pointer.
+ *		
+ * remove:
+ *	Release the private data.
+ *	Typically, call snd_device_free(dev->card, dev->driver_data)
+ */
+struct snd_seq_driver {
+	int (*probe)(struct snd_seq_device *dev);
+	void (*remove)(struct snd_seq_device *dev);
+	struct device_driver driver;
+	char *id;
+	int argsize;
+};
+
+#define to_seq_drv(_drv) \
+	container_of(_drv, struct snd_seq_driver, driver)
+
+/*
+ * prototypes
+ */
+#ifdef CONFIG_MODULES
+void snd_seq_device_load_drivers(void);
+#else
+#define snd_seq_device_load_drivers()
+#endif
+int snd_seq_device_new(struct snd_card *card, int device, const char *id,
+		       int argsize, struct snd_seq_device **result);
+
+#define SNDRV_SEQ_DEVICE_ARGPTR(dev) ((void *)(dev)->args)
+
+int __must_check __snd_seq_driver_register(struct snd_seq_driver *drv,
+					   struct module *mod);
+#define snd_seq_driver_register(drv) \
+	__snd_seq_driver_register(drv, THIS_MODULE)
+void snd_seq_driver_unregister(struct snd_seq_driver *drv);
+
+#define module_snd_seq_driver(drv) \
+	module_driver(drv, snd_seq_driver_register, snd_seq_driver_unregister)
+
+/*
+ * id strings for generic devices
+ */
+#define SNDRV_SEQ_DEV_ID_MIDISYNTH	"seq-midi"
+#define SNDRV_SEQ_DEV_ID_OPL3		"opl3-synth"
+#define SNDRV_SEQ_DEV_ID_UMP		"seq-ump-client"
+
+#endif /* __SOUND_SEQ_DEVICE_H */