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path: root/drivers/staging/iio/accel/adis16220_core.c
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Diffstat (limited to 'drivers/staging/iio/accel/adis16220_core.c')
-rw-r--r--drivers/staging/iio/accel/adis16220_core.c495
1 files changed, 495 insertions, 0 deletions
diff --git a/drivers/staging/iio/accel/adis16220_core.c b/drivers/staging/iio/accel/adis16220_core.c
new file mode 100644
index 000000000..e46a91c69
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16220_core.c
@@ -0,0 +1,495 @@
+/*
+ * ADIS16220 Programmable Digital Vibration Sensor driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#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/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "adis16220.h"
+
+static ssize_t adis16220_read_16bit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct adis16220_state *st = iio_priv(indio_dev);
+ ssize_t ret;
+ u16 val;
+
+ /* Take the iio_dev status lock */
+ mutex_lock(&indio_dev->mlock);
+ ret = adis_read_reg_16(&st->adis, this_attr->address, &val);
+ mutex_unlock(&indio_dev->mlock);
+ if (ret)
+ return ret;
+ return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t adis16220_write_16bit(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ struct adis16220_state *st = iio_priv(indio_dev);
+ int ret;
+ u16 val;
+
+ ret = kstrtou16(buf, 10, &val);
+ if (ret)
+ goto error_ret;
+ ret = adis_write_reg_16(&st->adis, this_attr->address, val);
+
+error_ret:
+ return ret ? ret : len;
+}
+
+static int adis16220_capture(struct iio_dev *indio_dev)
+{
+ struct adis16220_state *st = iio_priv(indio_dev);
+ int ret;
+
+ /* initiates a manual data capture */
+ ret = adis_write_reg_16(&st->adis, ADIS16220_GLOB_CMD, 0xBF08);
+ if (ret)
+ dev_err(&indio_dev->dev, "problem beginning capture");
+
+ usleep_range(10000, 11000); /* delay for capture to finish */
+
+ return ret;
+}
+
+static ssize_t adis16220_write_capture(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ bool val;
+ int ret;
+
+ ret = strtobool(buf, &val);
+ if (ret)
+ return ret;
+ if (!val)
+ return -EINVAL;
+ ret = adis16220_capture(indio_dev);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t adis16220_capture_buffer_read(struct iio_dev *indio_dev,
+ char *buf,
+ loff_t off,
+ size_t count,
+ int addr)
+{
+ struct adis16220_state *st = iio_priv(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ }, {
+ .tx_buf = st->tx,
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .cs_change = 1,
+ .delay_usecs = 25,
+ },
+ };
+ int ret;
+ int i;
+
+ if (unlikely(!count))
+ return count;
+
+ if ((off >= ADIS16220_CAPTURE_SIZE) || (count & 1) || (off & 1))
+ return -EINVAL;
+
+ if (off + count > ADIS16220_CAPTURE_SIZE)
+ count = ADIS16220_CAPTURE_SIZE - off;
+
+ /* write the begin position of capture buffer */
+ ret = adis_write_reg_16(&st->adis,
+ ADIS16220_CAPT_PNTR,
+ off > 1);
+ if (ret)
+ return -EIO;
+
+ /* read count/2 values from capture buffer */
+ mutex_lock(&st->buf_lock);
+
+ for (i = 0; i < count; i += 2) {
+ st->tx[i] = ADIS_READ_REG(addr);
+ st->tx[i + 1] = 0;
+ }
+ xfers[1].len = count;
+
+ ret = spi_sync_transfer(st->adis.spi, xfers, ARRAY_SIZE(xfers));
+ if (ret) {
+ mutex_unlock(&st->buf_lock);
+ return -EIO;
+ }
+
+ memcpy(buf, st->rx, count);
+
+ mutex_unlock(&st->buf_lock);
+ return count;
+}
+
+static ssize_t adis16220_accel_bin_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf,
+ loff_t off,
+ size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(kobj_to_dev(kobj));
+
+ return adis16220_capture_buffer_read(indio_dev, buf,
+ off, count,
+ ADIS16220_CAPT_BUFA);
+}
+
+static struct bin_attribute accel_bin = {
+ .attr = {
+ .name = "accel_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_accel_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+static ssize_t adis16220_adc1_bin_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(kobj_to_dev(kobj));
+
+ return adis16220_capture_buffer_read(indio_dev, buf,
+ off, count,
+ ADIS16220_CAPT_BUF1);
+}
+
+static struct bin_attribute adc1_bin = {
+ .attr = {
+ .name = "in0_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_adc1_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+static ssize_t adis16220_adc2_bin_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr,
+ char *buf, loff_t off,
+ size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(kobj_to_dev(kobj));
+
+ return adis16220_capture_buffer_read(indio_dev, buf,
+ off, count,
+ ADIS16220_CAPT_BUF2);
+}
+
+static struct bin_attribute adc2_bin = {
+ .attr = {
+ .name = "in1_bin",
+ .mode = S_IRUGO,
+ },
+ .read = adis16220_adc2_bin_read,
+ .size = ADIS16220_CAPTURE_SIZE,
+};
+
+#define IIO_DEV_ATTR_CAPTURE(_store) \
+ IIO_DEVICE_ATTR(capture, S_IWUSR, NULL, _store, 0)
+
+static IIO_DEV_ATTR_CAPTURE(adis16220_write_capture);
+
+#define IIO_DEV_ATTR_CAPTURE_COUNT(_mode, _show, _store, _addr) \
+ IIO_DEVICE_ATTR(capture_count, _mode, _show, _store, _addr)
+
+static IIO_DEV_ATTR_CAPTURE_COUNT(S_IWUSR | S_IRUGO,
+ adis16220_read_16bit,
+ adis16220_write_16bit,
+ ADIS16220_CAPT_PNTR);
+
+enum adis16220_channel {
+ in_supply, in_1, in_2, accel, temp
+};
+
+struct adis16220_address_spec {
+ u8 addr;
+ u8 bits;
+ bool sign;
+};
+
+/* Address / bits / signed */
+static const struct adis16220_address_spec adis16220_addresses[][3] = {
+ [in_supply] = { { ADIS16220_CAPT_SUPPLY, 12, 0 }, },
+ [in_1] = { { ADIS16220_CAPT_BUF1, 16, 1 },
+ { ADIS16220_AIN1_NULL, 16, 1 },
+ { ADIS16220_CAPT_PEAK1, 16, 1 }, },
+ [in_2] = { { ADIS16220_CAPT_BUF2, 16, 1 },
+ { ADIS16220_AIN2_NULL, 16, 1 },
+ { ADIS16220_CAPT_PEAK2, 16, 1 }, },
+ [accel] = { { ADIS16220_CAPT_BUFA, 16, 1 },
+ { ADIS16220_ACCL_NULL, 16, 1 },
+ { ADIS16220_CAPT_PEAKA, 16, 1 }, },
+ [temp] = { { ADIS16220_CAPT_TEMP, 12, 0 }, }
+};
+
+static int adis16220_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct adis16220_state *st = iio_priv(indio_dev);
+ const struct adis16220_address_spec *addr;
+ int ret = -EINVAL;
+ int addrind = 0;
+ u16 uval;
+ s16 sval;
+ u8 bits;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ addrind = 0;
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ if (chan->type == IIO_TEMP) {
+ *val = 25000 / -470 - 1278; /* 25 C = 1278 */
+ return IIO_VAL_INT;
+ }
+ addrind = 1;
+ break;
+ case IIO_CHAN_INFO_PEAK:
+ addrind = 2;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_TEMP:
+ *val = -470; /* -0.47 C */
+ *val2 = 0;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_ACCEL:
+ *val2 = IIO_G_TO_M_S_2(19073); /* 19.073 g */
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_VOLTAGE:
+ if (chan->channel == 0) {
+ *val = 1;
+ *val2 = 220700; /* 1.2207 mV */
+ } else {
+ /* Should really be dependent on VDD */
+ *val2 = 305180; /* 305.18 uV */
+ }
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ addr = &adis16220_addresses[chan->address][addrind];
+ if (addr->sign) {
+ ret = adis_read_reg_16(&st->adis, addr->addr, &sval);
+ if (ret)
+ return ret;
+ bits = addr->bits;
+ sval &= (1 << bits) - 1;
+ sval = (s16)(sval << (16 - bits)) >> (16 - bits);
+ *val = sval;
+ return IIO_VAL_INT;
+ }
+ ret = adis_read_reg_16(&st->adis, addr->addr, &uval);
+ if (ret)
+ return ret;
+ bits = addr->bits;
+ uval &= (1 << bits) - 1;
+ *val = uval;
+ return IIO_VAL_INT;
+}
+
+static const struct iio_chan_spec adis16220_channels[] = {
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .extend_name = "supply",
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = in_supply,
+ }, {
+ .type = IIO_ACCEL,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_PEAK),
+ .address = accel,
+ }, {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = temp,
+ }, {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = in_1,
+ }, {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 2,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = in_2,
+ }
+};
+
+static struct attribute *adis16220_attributes[] = {
+ &iio_dev_attr_capture.dev_attr.attr,
+ &iio_dev_attr_capture_count.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group adis16220_attribute_group = {
+ .attrs = adis16220_attributes,
+};
+
+static const struct iio_info adis16220_info = {
+ .attrs = &adis16220_attribute_group,
+ .driver_module = THIS_MODULE,
+ .read_raw = &adis16220_read_raw,
+};
+
+static const char * const adis16220_status_error_msgs[] = {
+ [ADIS16220_DIAG_STAT_VIOLATION_BIT] = "Capture period violation/interruption",
+ [ADIS16220_DIAG_STAT_SPI_FAIL_BIT] = "SPI failure",
+ [ADIS16220_DIAG_STAT_FLASH_UPT_BIT] = "Flash update failed",
+ [ADIS16220_DIAG_STAT_POWER_HIGH_BIT] = "Power supply above 3.625V",
+ [ADIS16220_DIAG_STAT_POWER_LOW_BIT] = "Power supply below 3.15V",
+};
+
+static const struct adis_data adis16220_data = {
+ .read_delay = 35,
+ .write_delay = 35,
+ .msc_ctrl_reg = ADIS16220_MSC_CTRL,
+ .glob_cmd_reg = ADIS16220_GLOB_CMD,
+ .diag_stat_reg = ADIS16220_DIAG_STAT,
+
+ .self_test_mask = ADIS16220_MSC_CTRL_SELF_TEST_EN,
+ .startup_delay = ADIS16220_STARTUP_DELAY,
+
+ .status_error_msgs = adis16220_status_error_msgs,
+ .status_error_mask = BIT(ADIS16220_DIAG_STAT_VIOLATION_BIT) |
+ BIT(ADIS16220_DIAG_STAT_SPI_FAIL_BIT) |
+ BIT(ADIS16220_DIAG_STAT_FLASH_UPT_BIT) |
+ BIT(ADIS16220_DIAG_STAT_POWER_HIGH_BIT) |
+ BIT(ADIS16220_DIAG_STAT_POWER_LOW_BIT),
+};
+
+static int adis16220_probe(struct spi_device *spi)
+{
+ int ret;
+ struct adis16220_state *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 = &adis16220_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = adis16220_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adis16220_channels);
+
+ ret = devm_iio_device_register(&spi->dev, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &accel_bin);
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &adc1_bin);
+ if (ret)
+ goto error_rm_accel_bin;
+
+ ret = sysfs_create_bin_file(&indio_dev->dev.kobj, &adc2_bin);
+ if (ret)
+ goto error_rm_adc1_bin;
+
+ ret = adis_init(&st->adis, indio_dev, spi, &adis16220_data);
+ if (ret)
+ goto error_rm_adc2_bin;
+ /* Get the device into a sane initial state */
+ ret = adis_initial_startup(&st->adis);
+ if (ret)
+ goto error_rm_adc2_bin;
+ return 0;
+
+error_rm_adc2_bin:
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc2_bin);
+error_rm_adc1_bin:
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc1_bin);
+error_rm_accel_bin:
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &accel_bin);
+ return ret;
+}
+
+static int adis16220_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = spi_get_drvdata(spi);
+
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc2_bin);
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &adc1_bin);
+ sysfs_remove_bin_file(&indio_dev->dev.kobj, &accel_bin);
+
+ return 0;
+}
+
+static struct spi_driver adis16220_driver = {
+ .driver = {
+ .name = "adis16220",
+ .owner = THIS_MODULE,
+ },
+ .probe = adis16220_probe,
+ .remove = adis16220_remove,
+};
+module_spi_driver(adis16220_driver);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADIS16220 Digital Vibration Sensor");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("spi:adis16220");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-02 06:14:27 +0000