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Diffstat (limited to 'drivers/iio/accel/adis16201.c')
-rw-r--r--drivers/iio/accel/adis16201.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/drivers/iio/accel/adis16201.c b/drivers/iio/accel/adis16201.c
new file mode 100644
index 0000000..4c1d482
--- /dev/null
+++ b/drivers/iio/accel/adis16201.c
@@ -0,0 +1,321 @@
+/*
+ * ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/sysfs.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/imu/adis.h>
+
+#define ADIS16201_STARTUP_DELAY_MS 220
+#define ADIS16201_FLASH_CNT 0x00
+
+/* Data Output Register Information */
+#define ADIS16201_SUPPLY_OUT_REG 0x02
+#define ADIS16201_XACCL_OUT_REG 0x04
+#define ADIS16201_YACCL_OUT_REG 0x06
+#define ADIS16201_AUX_ADC_REG 0x08
+#define ADIS16201_TEMP_OUT_REG 0x0A
+#define ADIS16201_XINCL_OUT_REG 0x0C
+#define ADIS16201_YINCL_OUT_REG 0x0E
+
+/* Calibration Register Definition */
+#define ADIS16201_XACCL_OFFS_REG 0x10
+#define ADIS16201_YACCL_OFFS_REG 0x12
+#define ADIS16201_XACCL_SCALE_REG 0x14
+#define ADIS16201_YACCL_SCALE_REG 0x16
+#define ADIS16201_XINCL_OFFS_REG 0x18
+#define ADIS16201_YINCL_OFFS_REG 0x1A
+#define ADIS16201_XINCL_SCALE_REG 0x1C
+#define ADIS16201_YINCL_SCALE_REG 0x1E
+
+/* Alarm Register Definition */
+#define ADIS16201_ALM_MAG1_REG 0x20
+#define ADIS16201_ALM_MAG2_REG 0x22
+#define ADIS16201_ALM_SMPL1_REG 0x24
+#define ADIS16201_ALM_SMPL2_REG 0x26
+#define ADIS16201_ALM_CTRL_REG 0x28
+
+#define ADIS16201_AUX_DAC_REG 0x30
+#define ADIS16201_GPIO_CTRL_REG 0x32
+#define ADIS16201_SMPL_PRD_REG 0x36
+/* Operation, filter configuration */
+#define ADIS16201_AVG_CNT_REG 0x38
+#define ADIS16201_SLP_CNT_REG 0x3A
+
+/* Miscellaneous Control Register Definition */
+#define ADIS16201_MSC_CTRL_REG 0x34
+#define ADIS16201_MSC_CTRL_SELF_TEST_EN BIT(8)
+/* Data-ready enable: 1 = enabled, 0 = disabled */
+#define ADIS16201_MSC_CTRL_DATA_RDY_EN BIT(2)
+/* Data-ready polarity: 1 = active high, 0 = active low */
+#define ADIS16201_MSC_CTRL_ACTIVE_DATA_RDY_HIGH BIT(1)
+/* Data-ready line selection: 1 = DIO1, 0 = DIO0 */
+#define ADIS16201_MSC_CTRL_DATA_RDY_DIO1 BIT(0)
+
+/* Diagnostics System Status Register Definition */
+#define ADIS16201_DIAG_STAT_REG 0x3C
+#define ADIS16201_DIAG_STAT_ALARM2 BIT(9)
+#define ADIS16201_DIAG_STAT_ALARM1 BIT(8)
+#define ADIS16201_DIAG_STAT_SPI_FAIL_BIT 3
+#define ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT 2
+/* Power supply above 3.625 V */
+#define ADIS16201_DIAG_STAT_POWER_HIGH_BIT 1
+/* Power supply below 3.15 V */
+#define ADIS16201_DIAG_STAT_POWER_LOW_BIT 0
+
+/* System Command Register Definition */
+#define ADIS16201_GLOB_CMD_REG 0x3E
+#define ADIS16201_GLOB_CMD_SW_RESET BIT(7)
+#define ADIS16201_GLOB_CMD_FACTORY_RESET BIT(1)
+
+#define ADIS16201_ERROR_ACTIVE BIT(14)
+
+enum adis16201_scan {
+ ADIS16201_SCAN_ACC_X,
+ ADIS16201_SCAN_ACC_Y,
+ ADIS16201_SCAN_INCLI_X,
+ ADIS16201_SCAN_INCLI_Y,
+ ADIS16201_SCAN_SUPPLY,
+ ADIS16201_SCAN_AUX_ADC,
+ ADIS16201_SCAN_TEMP,
+};
+
+static const u8 adis16201_addresses[] = {
+ [ADIS16201_SCAN_ACC_X] = ADIS16201_XACCL_OFFS_REG,
+ [ADIS16201_SCAN_ACC_Y] = ADIS16201_YACCL_OFFS_REG,
+ [ADIS16201_SCAN_INCLI_X] = ADIS16201_XINCL_OFFS_REG,
+ [ADIS16201_SCAN_INCLI_Y] = ADIS16201_YINCL_OFFS_REG,
+};
+
+static int adis16201_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct adis *st = iio_priv(indio_dev);
+ int ret;
+ int bits;
+ u8 addr;
+ s16 val16;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ return adis_single_conversion(indio_dev, chan,
+ ADIS16201_ERROR_ACTIVE, val);
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ if (chan->channel == 0) {
+ /* Voltage base units are mV hence 1.22 mV */
+ *val = 1;
+ *val2 = 220000;
+ } else {
+ /* Voltage base units are mV hence 0.61 mV */
+ *val = 0;
+ *val2 = 610000;
+ }
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_TEMP:
+ *val = -470;
+ *val2 = 0;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_ACCEL:
+ /*
+ * IIO base unit for sensitivity of accelerometer
+ * is milli g.
+ * 1 LSB represents 0.244 mg.
+ */
+ *val = 0;
+ *val2 = IIO_G_TO_M_S_2(462400);
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_INCLI:
+ *val = 0;
+ *val2 = 100000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ /*
+ * The raw ADC value is 1278 when the temperature
+ * is 25 degrees and the scale factor per milli
+ * degree celcius is -470.
+ */
+ *val = 25000 / -470 - 1278;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ switch (chan->type) {
+ case IIO_ACCEL:
+ bits = 12;
+ break;
+ case IIO_INCLI:
+ bits = 9;
+ break;
+ default:
+ return -EINVAL;
+ }
+ addr = adis16201_addresses[chan->scan_index];
+ ret = adis_read_reg_16(st, addr, &val16);
+ if (ret)
+ return ret;
+
+ *val = sign_extend32(val16, bits - 1);
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static int adis16201_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct adis *st = iio_priv(indio_dev);
+ int m;
+
+ if (mask != IIO_CHAN_INFO_CALIBBIAS)
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_ACCEL:
+ m = GENMASK(11, 0);
+ break;
+ case IIO_INCLI:
+ m = GENMASK(8, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return adis_write_reg_16(st, adis16201_addresses[chan->scan_index],
+ val & m);
+}
+
+static const struct iio_chan_spec adis16201_channels[] = {
+ ADIS_SUPPLY_CHAN(ADIS16201_SUPPLY_OUT_REG, ADIS16201_SCAN_SUPPLY, 0,
+ 12),
+ ADIS_TEMP_CHAN(ADIS16201_TEMP_OUT_REG, ADIS16201_SCAN_TEMP, 0, 12),
+ ADIS_ACCEL_CHAN(X, ADIS16201_XACCL_OUT_REG, ADIS16201_SCAN_ACC_X,
+ BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
+ ADIS_ACCEL_CHAN(Y, ADIS16201_YACCL_OUT_REG, ADIS16201_SCAN_ACC_Y,
+ BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
+ ADIS_AUX_ADC_CHAN(ADIS16201_AUX_ADC_REG, ADIS16201_SCAN_AUX_ADC, 0, 12),
+ ADIS_INCLI_CHAN(X, ADIS16201_XINCL_OUT_REG, ADIS16201_SCAN_INCLI_X,
+ BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
+ ADIS_INCLI_CHAN(X, ADIS16201_YINCL_OUT_REG, ADIS16201_SCAN_INCLI_Y,
+ BIT(IIO_CHAN_INFO_CALIBBIAS), 0, 14),
+ IIO_CHAN_SOFT_TIMESTAMP(7)
+};
+
+static const struct iio_info adis16201_info = {
+ .read_raw = adis16201_read_raw,
+ .write_raw = adis16201_write_raw,
+ .update_scan_mode = adis_update_scan_mode,
+};
+
+static const char * const adis16201_status_error_msgs[] = {
+ [ADIS16201_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
+ [ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT] = "Flash update failed",
+ [ADIS16201_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
+ [ADIS16201_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
+};
+
+static const struct adis_data adis16201_data = {
+ .read_delay = 20,
+ .msc_ctrl_reg = ADIS16201_MSC_CTRL_REG,
+ .glob_cmd_reg = ADIS16201_GLOB_CMD_REG,
+ .diag_stat_reg = ADIS16201_DIAG_STAT_REG,
+
+ .self_test_mask = ADIS16201_MSC_CTRL_SELF_TEST_EN,
+ .self_test_no_autoclear = true,
+ .startup_delay = ADIS16201_STARTUP_DELAY_MS,
+
+ .status_error_msgs = adis16201_status_error_msgs,
+ .status_error_mask = BIT(ADIS16201_DIAG_STAT_SPI_FAIL_BIT) |
+ BIT(ADIS16201_DIAG_STAT_FLASH_UPT_FAIL_BIT) |
+ BIT(ADIS16201_DIAG_STAT_POWER_HIGH_BIT) |
+ BIT(ADIS16201_DIAG_STAT_POWER_LOW_BIT),
+};
+
+static int adis16201_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ struct adis *st;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ spi_set_drvdata(spi, indio_dev);
+
+ indio_dev->name = spi->dev.driver->name;
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->info = &adis16201_info;
+
+ indio_dev->channels = adis16201_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = adis_init(st, indio_dev, spi, &adis16201_data);
+ if (ret)
+ return ret;
+
+ ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL);
+ if (ret)
+ return ret;
+
+ ret = adis_initial_startup(st);
+ if (ret)
+ goto error_cleanup_buffer_trigger;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto error_cleanup_buffer_trigger;
+
+ return 0;
+
+error_cleanup_buffer_trigger:
+ adis_cleanup_buffer_and_trigger(st, indio_dev);
+ return ret;
+}
+
+static int adis16201_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = spi_get_drvdata(spi);
+ struct adis *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ adis_cleanup_buffer_and_trigger(st, indio_dev);
+
+ return 0;
+}
+
+static struct spi_driver adis16201_driver = {
+ .driver = {
+ .name = "adis16201",
+ },
+ .probe = adis16201_probe,
+ .remove = adis16201_remove,
+};
+module_spi_driver(adis16201_driver);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("spi:adis16201");
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