--- /dev/null
+/*
+ * IIO driver for Domintech DMARD06 accelerometer
+ *
+ * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+
+#define DMARD06_DRV_NAME "dmard06"
+
+/* Device data registers */
+#define DMARD06_CHIP_ID_REG 0x0f
+#define DMARD06_TOUT_REG 0x40
+#define DMARD06_XOUT_REG 0x41
+#define DMARD06_YOUT_REG 0x42
+#define DMARD06_ZOUT_REG 0x43
+#define DMARD06_CTRL1_REG 0x44
+
+/* Device ID value */
+#define DMARD05_CHIP_ID 0x05
+#define DMARD06_CHIP_ID 0x06
+#define DMARD07_CHIP_ID 0x07
+
+/* Device values */
+#define DMARD05_AXIS_SCALE_VAL 15625
+#define DMARD06_AXIS_SCALE_VAL 31250
+#define DMARD06_TEMP_CENTER_VAL 25
+#define DMARD06_SIGN_BIT 7
+
+/* Device power modes */
+#define DMARD06_MODE_NORMAL 0x27
+#define DMARD06_MODE_POWERDOWN 0x00
+
+/* Device channels */
+#define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \
+ .type = IIO_ACCEL, \
+ .address = _reg, \
+ .channel2 = IIO_MOD_##_axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .modified = 1, \
+}
+
+#define DMARD06_TEMP_CHANNEL(_reg) { \
+ .type = IIO_TEMP, \
+ .address = _reg, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_OFFSET), \
+}
+
+struct dmard06_data {
+ struct i2c_client *client;
+ u8 chip_id;
+};
+
+static const struct iio_chan_spec dmard06_channels[] = {
+ DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
+ DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
+ DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
+ DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
+};
+
+static int dmard06_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct dmard06_data *dmard06 = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_byte_data(dmard06->client,
+ chan->address);
+ if (ret < 0) {
+ dev_err(&dmard06->client->dev,
+ "Error reading data: %d\n", ret);
+ return ret;
+ }
+
+ *val = sign_extend32(ret, DMARD06_SIGN_BIT);
+
+ if (dmard06->chip_id == DMARD06_CHIP_ID)
+ *val = *val >> 1;
+
+ switch (chan->type) {
+ case IIO_ACCEL:
+ return IIO_VAL_INT;
+ case IIO_TEMP:
+ if (dmard06->chip_id != DMARD06_CHIP_ID)
+ *val = *val / 2;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->type) {
+ case IIO_TEMP:
+ *val = DMARD06_TEMP_CENTER_VAL;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_ACCEL:
+ *val = 0;
+ if (dmard06->chip_id == DMARD06_CHIP_ID)
+ *val2 = DMARD06_AXIS_SCALE_VAL;
+ else
+ *val2 = DMARD05_AXIS_SCALE_VAL;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info dmard06_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = dmard06_read_raw,
+};
+
+static int dmard06_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ struct dmard06_data *dmard06;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "I2C check functionality failed\n");
+ return -ENXIO;
+ }
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
+ if (!indio_dev) {
+ dev_err(&client->dev, "Failed to allocate iio device\n");
+ return -ENOMEM;
+ }
+
+ dmard06 = iio_priv(indio_dev);
+ dmard06->client = client;
+
+ ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
+ if (ret < 0) {
+ dev_err(&client->dev, "Error reading chip id: %d\n", ret);
+ return ret;
+ }
+
+ if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
+ ret != DMARD07_CHIP_ID) {
+ dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
+ return -ENODEV;
+ }
+
+ dmard06->chip_id = ret;
+
+ i2c_set_clientdata(client, indio_dev);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = DMARD06_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = dmard06_channels;
+ indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
+ indio_dev->info = &dmard06_info;
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dmard06_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct dmard06_data *dmard06 = iio_priv(indio_dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
+ DMARD06_MODE_POWERDOWN);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int dmard06_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct dmard06_data *dmard06 = iio_priv(indio_dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
+ DMARD06_MODE_NORMAL);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume);
+#define DMARD06_PM_OPS (&dmard06_pm_ops)
+#else
+#define DMARD06_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id dmard06_id[] = {
+ { "dmard05", 0 },
+ { "dmard06", 0 },
+ { "dmard07", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, dmard06_id);
+
+static const struct of_device_id dmard06_of_match[] = {
+ { .compatible = "domintech,dmard05" },
+ { .compatible = "domintech,dmard06" },
+ { .compatible = "domintech,dmard07" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, dmard06_of_match);
+
+static struct i2c_driver dmard06_driver = {
+ .probe = dmard06_probe,
+ .id_table = dmard06_id,
+ .driver = {
+ .name = DMARD06_DRV_NAME,
+ .of_match_table = of_match_ptr(dmard06_of_match),
+ .pm = DMARD06_PM_OPS,
+ },
+};
+module_i2c_driver(dmard06_driver);
+
+MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
+MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
+MODULE_LICENSE("GPL v2");
projects / deliverable / linux.git / commitdiff
