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, 175 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/hwtimer.c b/drivers/acpi/acpica/hwtimer.c
new file mode 100644
index 000000000..c08bbaa95
--- /dev/null
+++ b/drivers/acpi/acpica/hwtimer.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Name: hwtimer.c - ACPI Power Management Timer Interface
+ *
+ * Copyright (C) 2000 - 2026, Intel Corp.
+ *
+ *****************************************************************************/
+
+#define EXPORT_ACPI_INTERFACES
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_HARDWARE
+ACPI_MODULE_NAME("hwtimer")
+
+#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer_resolution
+ *
+ * PARAMETERS:  resolution          - Where the resolution is returned
+ *
+ * RETURN:      Status and timer resolution
+ *
+ * DESCRIPTION: Obtains resolution of the ACPI PM Timer (24 or 32 bits).
+ *
+ ******************************************************************************/
+acpi_status acpi_get_timer_resolution(u32 * resolution)
+{
+	ACPI_FUNCTION_TRACE(acpi_get_timer_resolution);
+
+	if (!resolution) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	if ((acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) == 0) {
+		*resolution = 24;
+	} else {
+		*resolution = 32;
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_timer_resolution)
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer
+ *
+ * PARAMETERS:  ticks               - Where the timer value is returned
+ *
+ * RETURN:      Status and current timer value (ticks)
+ *
+ * DESCRIPTION: Obtains current value of ACPI PM Timer (in ticks).
+ *
+ ******************************************************************************/
+acpi_status acpi_get_timer(u32 * ticks)
+{
+	acpi_status status;
+	u64 timer_value;
+
+	ACPI_FUNCTION_TRACE(acpi_get_timer);
+
+	if (!ticks) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* ACPI 5.0A: PM Timer is optional */
+
+	if (!acpi_gbl_FADT.xpm_timer_block.address) {
+		return_ACPI_STATUS(AE_SUPPORT);
+	}
+
+	status = acpi_hw_read(&timer_value, &acpi_gbl_FADT.xpm_timer_block);
+	if (ACPI_SUCCESS(status)) {
+
+		/* ACPI PM Timer is defined to be 32 bits (PM_TMR_LEN) */
+
+		*ticks = (u32)timer_value;
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_timer)
+
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_get_timer_duration
+ *
+ * PARAMETERS:  start_ticks         - Starting timestamp
+ *              end_ticks           - End timestamp
+ *              time_elapsed        - Where the elapsed time is returned
+ *
+ * RETURN:      Status and time_elapsed
+ *
+ * DESCRIPTION: Computes the time elapsed (in microseconds) between two
+ *              PM Timer time stamps, taking into account the possibility of
+ *              rollovers, the timer resolution, and timer frequency.
+ *
+ *              The PM Timer's clock ticks at roughly 3.6 times per
+ *              _microsecond_, and its clock continues through Cx state
+ *              transitions (unlike many CPU timestamp counters) -- making it
+ *              a versatile and accurate timer.
+ *
+ *              Note that this function accommodates only a single timer
+ *              rollover. Thus for 24-bit timers, this function should only
+ *              be used for calculating durations less than ~4.6 seconds
+ *              (~20 minutes for 32-bit timers) -- calculations below:
+ *
+ *              2**24 Ticks / 3,600,000 Ticks/Sec = 4.66 sec
+ *              2**32 Ticks / 3,600,000 Ticks/Sec = 1193 sec or 19.88 minutes
+ *
+ ******************************************************************************/
+acpi_status
+acpi_get_timer_duration(u32 start_ticks, u32 end_ticks, u32 *time_elapsed)
+{
+	acpi_status status;
+	u64 delta_ticks;
+	u64 quotient;
+
+	ACPI_FUNCTION_TRACE(acpi_get_timer_duration);
+
+	if (!time_elapsed) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* ACPI 5.0A: PM Timer is optional */
+
+	if (!acpi_gbl_FADT.xpm_timer_block.address) {
+		return_ACPI_STATUS(AE_SUPPORT);
+	}
+
+	if (start_ticks == end_ticks) {
+		*time_elapsed = 0;
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/*
+	 * Compute Tick Delta:
+	 * Handle (max one) timer rollovers on 24-bit versus 32-bit timers.
+	 */
+	delta_ticks = end_ticks;
+	if (start_ticks > end_ticks) {
+		if ((acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) == 0) {
+
+			/* 24-bit Timer */
+
+			delta_ticks |= (u64)1 << 24;
+		} else {
+			/* 32-bit Timer */
+
+			delta_ticks |= (u64)1 << 32;
+		}
+	}
+	delta_ticks -= start_ticks;
+
+	/*
+	 * Compute Duration (Requires a 64-bit multiply and divide):
+	 *
+	 * time_elapsed (microseconds) =
+	 *  (delta_ticks * ACPI_USEC_PER_SEC) / ACPI_PM_TIMER_FREQUENCY;
+	 */
+	status = acpi_ut_short_divide(delta_ticks * ACPI_USEC_PER_SEC,
+				      ACPI_PM_TIMER_FREQUENCY, &quotient, NULL);
+
+	*time_elapsed = (u32)quotient;
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_timer_duration)
+#endif				/* !ACPI_REDUCED_HARDWARE */