IIO: Change msleep to usleep_range for small msecs

msleep(1~20) may not do what the caller intends, and will often sleep longer.
(~20 ms actual sleep for any value given in the 1~20ms range)
This is not the desired behaviour for many cases like device resume time,
device suspend time, device enable time, data reading time, etc.
Thus, change msleep to usleep_range for precise wakeups.

Signed-off-by: Aniroop Mathur <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/exynos_adc.c

···
 		input_report_key(info->input, BTN_TOUCH, 1);
 		input_sync(info->input);
 
-		msleep(1);
+		usleep_range(1000, 1100);
 	};
 
 	writel(0, ADC_V1_CLRINTPNDNUP(info->regs));

drivers/iio/pressure/bmp280-core.c

···
 	struct bmp180_calib calib;
 	struct regulator *vddd;
 	struct regulator *vdda;
-	unsigned int start_up_time; /* in milliseconds */
+	unsigned int start_up_time; /* in microseconds */
 
 	/* log of base 2 of oversampling rate */
 	u8 oversampling_press;
···
 		data->chip_info = &bmp180_chip_info;
 		data->oversampling_press = ilog2(8);
 		data->oversampling_temp = ilog2(1);
-		data->start_up_time = 10;
+		data->start_up_time = 10000;
 		break;
 	case BMP280_CHIP_ID:
 		indio_dev->num_channels = 2;
 		data->chip_info = &bmp280_chip_info;
 		data->oversampling_press = ilog2(16);
 		data->oversampling_temp = ilog2(2);
-		data->start_up_time = 2;
+		data->start_up_time = 2000;
 		break;
 	case BME280_CHIP_ID:
 		indio_dev->num_channels = 3;
···
 		data->oversampling_press = ilog2(16);
 		data->oversampling_humid = ilog2(16);
 		data->oversampling_temp = ilog2(2);
-		data->start_up_time = 2;
+		data->start_up_time = 2000;
 		break;
 	default:
 		return -EINVAL;
···
 		goto out_disable_vddd;
 	}
 	/* Wait to make sure we started up properly */
-	mdelay(data->start_up_time);
+	usleep_range(data->start_up_time, data->start_up_time + 100);
 
 	/* Bring chip out of reset if there is an assigned GPIO line */
 	gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
···
 	 * Set autosuspend to two orders of magnitude larger than the
 	 * start-up time.
 	 */
-	pm_runtime_set_autosuspend_delay(dev, data->start_up_time *100);
+	pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_put(dev);
 
···
 	ret = regulator_enable(data->vdda);
 	if (ret)
 		return ret;
-	msleep(data->start_up_time);
+	usleep_range(data->start_up_time, data->start_up_time + 100);
 	return data->chip_info->chip_config(data);
 }
 #endif /* CONFIG_PM */

drivers/staging/iio/meter/ade7753.c

···
 	}
 
 	ade7753_reset(dev);
-	msleep(ADE7753_STARTUP_DELAY);
+	usleep_range(ADE7753_STARTUP_DELAY, ADE7753_STARTUP_DELAY + 100);
 
 err_ret:
 	return ret;

drivers/staging/iio/meter/ade7753.h

···
 
 #define ADE7753_MAX_TX    4
 #define ADE7753_MAX_RX    4
-#define ADE7753_STARTUP_DELAY 1
+#define ADE7753_STARTUP_DELAY 1000
 
 #define ADE7753_SPI_SLOW	(u32)(300 * 1000)
 #define ADE7753_SPI_BURST	(u32)(1000 * 1000)

drivers/staging/iio/meter/ade7754.c

···
 	}
 
 	ade7754_reset(dev);
-	msleep(ADE7754_STARTUP_DELAY);
+	usleep_range(ADE7754_STARTUP_DELAY, ADE7754_STARTUP_DELAY + 100);
 
 err_ret:
 	return ret;

drivers/staging/iio/meter/ade7754.h

···
 
 #define ADE7754_MAX_TX    4
 #define ADE7754_MAX_RX    4
-#define ADE7754_STARTUP_DELAY 1
+#define ADE7754_STARTUP_DELAY 1000
 
 #define ADE7754_SPI_SLOW	(u32)(300 * 1000)
 #define ADE7754_SPI_BURST	(u32)(1000 * 1000)

drivers/staging/iio/meter/ade7758.h

···
 
 #define ADE7758_MAX_TX    8
 #define ADE7758_MAX_RX    4
-#define ADE7758_STARTUP_DELAY 1
+#define ADE7758_STARTUP_DELAY 1000
 
 #define AD7758_NUM_WAVSEL	5
 #define AD7758_NUM_PHSEL	3

drivers/staging/iio/meter/ade7758_core.c

···
 	}
 
 	ade7758_reset(dev);
-	msleep(ADE7758_STARTUP_DELAY);
+	usleep_range(ADE7758_STARTUP_DELAY, ADE7758_STARTUP_DELAY + 100);
 
 err_ret:
 	return ret;

drivers/staging/iio/meter/ade7759.c

···
 	}
 
 	ade7759_reset(dev);
-	msleep(ADE7759_STARTUP_DELAY);
+	usleep_range(ADE7759_STARTUP_DELAY, ADE7759_STARTUP_DELAY + 100);
 
 err_ret:
 	return ret;

drivers/staging/iio/meter/ade7759.h

···
 
 #define ADE7759_MAX_TX    6
 #define ADE7759_MAX_RX    6
-#define ADE7759_STARTUP_DELAY 1
+#define ADE7759_STARTUP_DELAY 1000
 
 #define ADE7759_SPI_SLOW	(u32)(300 * 1000)
 #define ADE7759_SPI_BURST	(u32)(1000 * 1000)

drivers/staging/iio/meter/ade7854.c

···
 	}
 
 	ade7854_reset(dev);
-	msleep(ADE7854_STARTUP_DELAY);
+	usleep_range(ADE7854_STARTUP_DELAY, ADE7854_STARTUP_DELAY + 100);
 
 err_ret:
 	return ret;

drivers/staging/iio/meter/ade7854.h

···
 
 #define ADE7854_MAX_TX    7
 #define ADE7854_MAX_RX    7
-#define ADE7854_STARTUP_DELAY 1
+#define ADE7854_STARTUP_DELAY 1000
 
 #define ADE7854_SPI_SLOW	(u32)(300 * 1000)
 #define ADE7854_SPI_BURST	(u32)(1000 * 1000)