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253 lines
6.4 KiB
253 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IIO driver for the 3-axis accelerometer Domintech ARD10. |
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* |
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* Copyright (c) 2016 Hans de Goede <[email protected]> |
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* Copyright (c) 2012 Domintech Technology Co., Ltd |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/byteorder/generic.h> |
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#define DMARD10_REG_ACTR 0x00 |
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#define DMARD10_REG_AFEM 0x0c |
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#define DMARD10_REG_STADR 0x12 |
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#define DMARD10_REG_STAINT 0x1c |
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#define DMARD10_REG_MISC2 0x1f |
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#define DMARD10_REG_PD 0x21 |
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#define DMARD10_MODE_OFF 0x00 |
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#define DMARD10_MODE_STANDBY 0x02 |
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#define DMARD10_MODE_ACTIVE 0x06 |
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#define DMARD10_MODE_READ_OTP 0x12 |
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#define DMARD10_MODE_RESET_DATA_PATH 0x82 |
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/* AFEN set 1, ATM[2:0]=b'000 (normal), EN_Z/Y/X/T=1 */ |
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#define DMARD10_VALUE_AFEM_AFEN_NORMAL 0x8f |
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/* ODR[3:0]=b'0111 (100Hz), CCK[3:0]=b'0100 (204.8kHZ) */ |
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#define DMARD10_VALUE_CKSEL_ODR_100_204 0x74 |
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/* INTC[6:5]=b'00 */ |
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#define DMARD10_VALUE_INTC 0x00 |
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/* TAP1/TAP2 Average 2 */ |
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#define DMARD10_VALUE_TAPNS_AVE_2 0x11 |
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#define DMARD10_VALUE_STADR 0x55 |
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#define DMARD10_VALUE_STAINT 0xaa |
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#define DMARD10_VALUE_MISC2_OSCA_EN 0x08 |
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#define DMARD10_VALUE_PD_RST 0x52 |
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/* Offsets into the buffer read in dmard10_read_raw() */ |
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#define DMARD10_X_OFFSET 1 |
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#define DMARD10_Y_OFFSET 2 |
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#define DMARD10_Z_OFFSET 3 |
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/* |
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* a value of + or -128 corresponds to + or - 1G |
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* scale = 9.81 / 128 = 0.076640625 |
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*/ |
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static const int dmard10_nscale = 76640625; |
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#define DMARD10_CHANNEL(reg, axis) { \ |
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.type = IIO_ACCEL, \ |
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.address = reg, \ |
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.modified = 1, \ |
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.channel2 = IIO_MOD_##axis, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
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} |
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static const struct iio_chan_spec dmard10_channels[] = { |
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DMARD10_CHANNEL(DMARD10_X_OFFSET, X), |
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DMARD10_CHANNEL(DMARD10_Y_OFFSET, Y), |
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DMARD10_CHANNEL(DMARD10_Z_OFFSET, Z), |
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}; |
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struct dmard10_data { |
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struct i2c_client *client; |
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}; |
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/* Init sequence taken from the android driver */ |
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static int dmard10_reset(struct i2c_client *client) |
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{ |
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unsigned char buffer[7]; |
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int ret; |
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/* 1. Powerdown reset */ |
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ret = i2c_smbus_write_byte_data(client, DMARD10_REG_PD, |
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DMARD10_VALUE_PD_RST); |
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if (ret < 0) |
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return ret; |
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/* |
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* 2. ACTR => Standby mode => Download OTP to parameter reg => |
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* Standby mode => Reset data path => Standby mode |
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*/ |
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buffer[0] = DMARD10_REG_ACTR; |
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buffer[1] = DMARD10_MODE_STANDBY; |
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buffer[2] = DMARD10_MODE_READ_OTP; |
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buffer[3] = DMARD10_MODE_STANDBY; |
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buffer[4] = DMARD10_MODE_RESET_DATA_PATH; |
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buffer[5] = DMARD10_MODE_STANDBY; |
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ret = i2c_master_send(client, buffer, 6); |
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if (ret < 0) |
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return ret; |
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/* 3. OSCA_EN = 1, TSTO = b'000 (INT1 = normal, TEST0 = normal) */ |
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ret = i2c_smbus_write_byte_data(client, DMARD10_REG_MISC2, |
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DMARD10_VALUE_MISC2_OSCA_EN); |
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if (ret < 0) |
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return ret; |
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/* 4. AFEN = 1 (AFE will powerdown after ADC) */ |
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buffer[0] = DMARD10_REG_AFEM; |
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buffer[1] = DMARD10_VALUE_AFEM_AFEN_NORMAL; |
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buffer[2] = DMARD10_VALUE_CKSEL_ODR_100_204; |
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buffer[3] = DMARD10_VALUE_INTC; |
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buffer[4] = DMARD10_VALUE_TAPNS_AVE_2; |
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buffer[5] = 0x00; /* DLYC, no delay timing */ |
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buffer[6] = 0x07; /* INTD=1 push-pull, INTA=1 active high, AUTOT=1 */ |
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ret = i2c_master_send(client, buffer, 7); |
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if (ret < 0) |
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return ret; |
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/* 5. Activation mode */ |
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ret = i2c_smbus_write_byte_data(client, DMARD10_REG_ACTR, |
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DMARD10_MODE_ACTIVE); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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/* Shutdown sequence taken from the android driver */ |
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static int dmard10_shutdown(struct i2c_client *client) |
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{ |
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unsigned char buffer[3]; |
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buffer[0] = DMARD10_REG_ACTR; |
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buffer[1] = DMARD10_MODE_STANDBY; |
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buffer[2] = DMARD10_MODE_OFF; |
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return i2c_master_send(client, buffer, 3); |
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} |
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static int dmard10_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct dmard10_data *data = iio_priv(indio_dev); |
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__le16 buf[4]; |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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/* |
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* Read 8 bytes starting at the REG_STADR register, trying to |
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* read the individual X, Y, Z registers will always read 0. |
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*/ |
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ret = i2c_smbus_read_i2c_block_data(data->client, |
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DMARD10_REG_STADR, |
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sizeof(buf), (u8 *)buf); |
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if (ret < 0) |
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return ret; |
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ret = le16_to_cpu(buf[chan->address]); |
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*val = sign_extend32(ret, 12); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = 0; |
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*val2 = dmard10_nscale; |
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return IIO_VAL_INT_PLUS_NANO; |
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default: |
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return -EINVAL; |
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} |
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} |
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static const struct iio_info dmard10_info = { |
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.read_raw = dmard10_read_raw, |
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}; |
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static void dmard10_shutdown_cleanup(void *client) |
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{ |
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dmard10_shutdown(client); |
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} |
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static int dmard10_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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int ret; |
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struct iio_dev *indio_dev; |
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struct dmard10_data *data; |
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/* These 2 registers have special POR reset values used for id */ |
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ret = i2c_smbus_read_byte_data(client, DMARD10_REG_STADR); |
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if (ret != DMARD10_VALUE_STADR) |
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return (ret < 0) ? ret : -ENODEV; |
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ret = i2c_smbus_read_byte_data(client, DMARD10_REG_STAINT); |
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if (ret != DMARD10_VALUE_STAINT) |
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return (ret < 0) ? ret : -ENODEV; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) { |
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dev_err(&client->dev, "iio allocation failed!\n"); |
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return -ENOMEM; |
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} |
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data = iio_priv(indio_dev); |
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data->client = client; |
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indio_dev->info = &dmard10_info; |
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indio_dev->name = "dmard10"; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = dmard10_channels; |
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indio_dev->num_channels = ARRAY_SIZE(dmard10_channels); |
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ret = dmard10_reset(client); |
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if (ret < 0) |
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return ret; |
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ret = devm_add_action_or_reset(&client->dev, dmard10_shutdown_cleanup, |
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client); |
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if (ret) |
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return ret; |
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return devm_iio_device_register(&client->dev, indio_dev); |
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} |
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static int dmard10_suspend(struct device *dev) |
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{ |
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return dmard10_shutdown(to_i2c_client(dev)); |
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} |
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static int dmard10_resume(struct device *dev) |
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{ |
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return dmard10_reset(to_i2c_client(dev)); |
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} |
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static DEFINE_SIMPLE_DEV_PM_OPS(dmard10_pm_ops, dmard10_suspend, |
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dmard10_resume); |
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static const struct i2c_device_id dmard10_i2c_id[] = { |
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{"dmard10", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, dmard10_i2c_id); |
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static struct i2c_driver dmard10_driver = { |
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.driver = { |
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.name = "dmard10", |
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.pm = pm_sleep_ptr(&dmard10_pm_ops), |
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}, |
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.probe = dmard10_probe, |
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.id_table = dmard10_i2c_id, |
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}; |
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module_i2c_driver(dmard10_driver); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_DESCRIPTION("Domintech ARD10 3-Axis Accelerometer driver"); |
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MODULE_LICENSE("GPL v2");
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