diff options
Diffstat (limited to 'kernel/drivers/staging/iio/accel/adis16204_core.c')
| -rw-r--r-- | kernel/drivers/staging/iio/accel/adis16204_core.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/kernel/drivers/staging/iio/accel/adis16204_core.c b/kernel/drivers/staging/iio/accel/adis16204_core.c new file mode 100644 index 000000000..ea0ac2467 --- /dev/null +++ b/kernel/drivers/staging/iio/accel/adis16204_core.c @@ -0,0 +1,254 @@ +/* + * ADIS16204 Programmable High-g Digital Impact Sensor and Recorder + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/spi/spi.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/list.h> +#include <linux/module.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/imu/adis.h> + +#include "adis16204.h" + +/* Unique to this driver currently */ + +static const u8 adis16204_addresses[][2] = { + [ADIS16204_SCAN_ACC_X] = { ADIS16204_XACCL_NULL, ADIS16204_X_PEAK_OUT }, + [ADIS16204_SCAN_ACC_Y] = { ADIS16204_YACCL_NULL, ADIS16204_Y_PEAK_OUT }, + [ADIS16204_SCAN_ACC_XY] = { 0, ADIS16204_XY_PEAK_OUT }, +}; + +static int adis16204_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; + int addrind; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + return adis_single_conversion(indio_dev, chan, + ADIS16204_ERROR_ACTIVE, val); + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_VOLTAGE: + if (chan->channel == 0) { + *val = 1; + *val2 = 220000; /* 1.22 mV */ + } else { + *val = 0; + *val2 = 610000; /* 0.61 mV */ + } + return IIO_VAL_INT_PLUS_MICRO; + case IIO_TEMP: + *val = -470; /* 0.47 C */ + *val2 = 0; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_ACCEL: + *val = 0; + switch (chan->channel2) { + case IIO_MOD_X: + case IIO_MOD_ROOT_SUM_SQUARED_X_Y: + *val2 = IIO_G_TO_M_S_2(17125); /* 17.125 mg */ + break; + case IIO_MOD_Y: + case IIO_MOD_Z: + *val2 = IIO_G_TO_M_S_2(8407); /* 8.407 mg */ + break; + } + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + break; + case IIO_CHAN_INFO_OFFSET: + *val = 25000 / -470 - 1278; /* 25 C = 1278 */ + return IIO_VAL_INT; + case IIO_CHAN_INFO_CALIBBIAS: + case IIO_CHAN_INFO_PEAK: + if (mask == IIO_CHAN_INFO_CALIBBIAS) { + bits = 12; + addrind = 0; + } else { /* PEAK_SEPARATE */ + bits = 14; + addrind = 1; + } + mutex_lock(&indio_dev->mlock); + addr = adis16204_addresses[chan->scan_index][addrind]; + ret = adis_read_reg_16(st, addr, &val16); + if (ret) { + mutex_unlock(&indio_dev->mlock); + return ret; + } + val16 &= (1 << bits) - 1; + val16 = (s16)(val16 << (16 - bits)) >> (16 - bits); + *val = val16; + mutex_unlock(&indio_dev->mlock); + return IIO_VAL_INT; + } + return -EINVAL; +} + +static int adis16204_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 bits; + s16 val16; + u8 addr; + + switch (mask) { + case IIO_CHAN_INFO_CALIBBIAS: + switch (chan->type) { + case IIO_ACCEL: + bits = 12; + break; + default: + return -EINVAL; + } + val16 = val & ((1 << bits) - 1); + addr = adis16204_addresses[chan->scan_index][1]; + return adis_write_reg_16(st, addr, val16); + } + return -EINVAL; +} + +static const struct iio_chan_spec adis16204_channels[] = { + ADIS_SUPPLY_CHAN(ADIS16204_SUPPLY_OUT, ADIS16204_SCAN_SUPPLY, 0, 12), + ADIS_AUX_ADC_CHAN(ADIS16204_AUX_ADC, ADIS16204_SCAN_AUX_ADC, 0, 12), + ADIS_TEMP_CHAN(ADIS16204_TEMP_OUT, ADIS16204_SCAN_TEMP, 0, 12), + ADIS_ACCEL_CHAN(X, ADIS16204_XACCL_OUT, ADIS16204_SCAN_ACC_X, + BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), + 0, 14), + ADIS_ACCEL_CHAN(Y, ADIS16204_YACCL_OUT, ADIS16204_SCAN_ACC_Y, + BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_PEAK), + 0, 14), + ADIS_ACCEL_CHAN(ROOT_SUM_SQUARED_X_Y, ADIS16204_XY_RSS_OUT, + ADIS16204_SCAN_ACC_XY, BIT(IIO_CHAN_INFO_PEAK), 0, 14), + IIO_CHAN_SOFT_TIMESTAMP(5), +}; + +static const struct iio_info adis16204_info = { + .read_raw = &adis16204_read_raw, + .write_raw = &adis16204_write_raw, + .update_scan_mode = adis_update_scan_mode, + .driver_module = THIS_MODULE, +}; + +static const char * const adis16204_status_error_msgs[] = { + [ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT] = "Self test failure", + [ADIS16204_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure", + [ADIS16204_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed", + [ADIS16204_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V", + [ADIS16204_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 2.975V", +}; + +static const struct adis_data adis16204_data = { + .read_delay = 20, + .msc_ctrl_reg = ADIS16204_MSC_CTRL, + .glob_cmd_reg = ADIS16204_GLOB_CMD, + .diag_stat_reg = ADIS16204_DIAG_STAT, + + .self_test_mask = ADIS16204_MSC_CTRL_SELF_TEST_EN, + .startup_delay = ADIS16204_STARTUP_DELAY, + + .status_error_msgs = adis16204_status_error_msgs, + .status_error_mask = BIT(ADIS16204_DIAG_STAT_SELFTEST_FAIL_BIT) | + BIT(ADIS16204_DIAG_STAT_SPI_FAIL_BIT) | + BIT(ADIS16204_DIAG_STAT_FLASH_UPT_BIT) | + BIT(ADIS16204_DIAG_STAT_POWER_HIGH_BIT) | + BIT(ADIS16204_DIAG_STAT_POWER_LOW_BIT), +}; + +static int adis16204_probe(struct spi_device *spi) +{ + int ret; + struct adis *st; + struct iio_dev *indio_dev; + + /* setup the industrialio driver allocated elements */ + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + st = iio_priv(indio_dev); + /* this is only used for removal purposes */ + spi_set_drvdata(spi, indio_dev); + + indio_dev->name = spi->dev.driver->name; + indio_dev->dev.parent = &spi->dev; + indio_dev->info = &adis16204_info; + indio_dev->channels = adis16204_channels; + indio_dev->num_channels = ARRAY_SIZE(adis16204_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = adis_init(st, indio_dev, spi, &adis16204_data); + if (ret) + return ret; + + ret = adis_setup_buffer_and_trigger(st, indio_dev, NULL); + if (ret) + return ret; + + /* Get the device into a sane initial state */ + ret = adis_initial_startup(st); + if (ret) + goto error_cleanup_buffer_trigger; + ret = iio_device_register(indio_dev); + if (ret) + goto error_cleanup_buffer_trigger; + + return 0; + +error_cleanup_buffer_trigger: + adis_cleanup_buffer_and_trigger(st, indio_dev); + return ret; +} + +static int adis16204_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 adis16204_driver = { + .driver = { + .name = "adis16204", + .owner = THIS_MODULE, + }, + .probe = adis16204_probe, + .remove = adis16204_remove, +}; +module_spi_driver(adis16204_driver); + +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_DESCRIPTION("ADIS16204 High-g Digital Impact Sensor and Recorder"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:adis16204"); |