1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IIO driver for Domintech DMARD06 accelerometer 4 * 5 * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/mod_devicetable.h> 10 #include <linux/i2c.h> 11 #include <linux/iio/iio.h> 12 13 #define DMARD06_DRV_NAME "dmard06" 14 15 /* Device data registers */ 16 #define DMARD06_CHIP_ID_REG 0x0f 17 #define DMARD06_TOUT_REG 0x40 18 #define DMARD06_XOUT_REG 0x41 19 #define DMARD06_YOUT_REG 0x42 20 #define DMARD06_ZOUT_REG 0x43 21 #define DMARD06_CTRL1_REG 0x44 22 23 /* Device ID value */ 24 #define DMARD05_CHIP_ID 0x05 25 #define DMARD06_CHIP_ID 0x06 26 #define DMARD07_CHIP_ID 0x07 27 28 /* Device values */ 29 #define DMARD05_AXIS_SCALE_VAL 15625 30 #define DMARD06_AXIS_SCALE_VAL 31250 31 #define DMARD06_TEMP_CENTER_VAL 25 32 #define DMARD06_SIGN_BIT 7 33 34 /* Device power modes */ 35 #define DMARD06_MODE_NORMAL 0x27 36 #define DMARD06_MODE_POWERDOWN 0x00 37 38 /* Device channels */ 39 #define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \ 40 .type = IIO_ACCEL, \ 41 .address = _reg, \ 42 .channel2 = IIO_MOD_##_axis, \ 43 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 44 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 45 .modified = 1, \ 46 } 47 48 #define DMARD06_TEMP_CHANNEL(_reg) { \ 49 .type = IIO_TEMP, \ 50 .address = _reg, \ 51 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 52 BIT(IIO_CHAN_INFO_OFFSET), \ 53 } 54 55 struct dmard06_data { 56 struct i2c_client *client; 57 u8 chip_id; 58 }; 59 60 static const struct iio_chan_spec dmard06_channels[] = { 61 DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG), 62 DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG), 63 DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG), 64 DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG), 65 }; 66 67 static int dmard06_read_raw(struct iio_dev *indio_dev, 68 struct iio_chan_spec const *chan, 69 int *val, int *val2, long mask) 70 { 71 struct dmard06_data *dmard06 = iio_priv(indio_dev); 72 int ret; 73 74 switch (mask) { 75 case IIO_CHAN_INFO_RAW: 76 ret = i2c_smbus_read_byte_data(dmard06->client, 77 chan->address); 78 if (ret < 0) { 79 dev_err(&dmard06->client->dev, 80 "Error reading data: %d\n", ret); 81 return ret; 82 } 83 84 *val = sign_extend32(ret, DMARD06_SIGN_BIT); 85 86 if (dmard06->chip_id == DMARD06_CHIP_ID) 87 *val = *val >> 1; 88 89 switch (chan->type) { 90 case IIO_ACCEL: 91 return IIO_VAL_INT; 92 case IIO_TEMP: 93 if (dmard06->chip_id != DMARD06_CHIP_ID) 94 *val = *val / 2; 95 return IIO_VAL_INT; 96 default: 97 return -EINVAL; 98 } 99 case IIO_CHAN_INFO_OFFSET: 100 switch (chan->type) { 101 case IIO_TEMP: 102 *val = DMARD06_TEMP_CENTER_VAL; 103 return IIO_VAL_INT; 104 default: 105 return -EINVAL; 106 } 107 case IIO_CHAN_INFO_SCALE: 108 switch (chan->type) { 109 case IIO_ACCEL: 110 *val = 0; 111 if (dmard06->chip_id == DMARD06_CHIP_ID) 112 *val2 = DMARD06_AXIS_SCALE_VAL; 113 else 114 *val2 = DMARD05_AXIS_SCALE_VAL; 115 return IIO_VAL_INT_PLUS_MICRO; 116 default: 117 return -EINVAL; 118 } 119 default: 120 return -EINVAL; 121 } 122 } 123 124 static const struct iio_info dmard06_info = { 125 .read_raw = dmard06_read_raw, 126 }; 127 128 static int dmard06_probe(struct i2c_client *client, 129 const struct i2c_device_id *id) 130 { 131 int ret; 132 struct iio_dev *indio_dev; 133 struct dmard06_data *dmard06; 134 135 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 136 dev_err(&client->dev, "I2C check functionality failed\n"); 137 return -ENXIO; 138 } 139 140 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06)); 141 if (!indio_dev) { 142 dev_err(&client->dev, "Failed to allocate iio device\n"); 143 return -ENOMEM; 144 } 145 146 dmard06 = iio_priv(indio_dev); 147 dmard06->client = client; 148 149 ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG); 150 if (ret < 0) { 151 dev_err(&client->dev, "Error reading chip id: %d\n", ret); 152 return ret; 153 } 154 155 if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID && 156 ret != DMARD07_CHIP_ID) { 157 dev_err(&client->dev, "Invalid chip id: %02d\n", ret); 158 return -ENODEV; 159 } 160 161 dmard06->chip_id = ret; 162 163 i2c_set_clientdata(client, indio_dev); 164 indio_dev->name = DMARD06_DRV_NAME; 165 indio_dev->modes = INDIO_DIRECT_MODE; 166 indio_dev->channels = dmard06_channels; 167 indio_dev->num_channels = ARRAY_SIZE(dmard06_channels); 168 indio_dev->info = &dmard06_info; 169 170 return devm_iio_device_register(&client->dev, indio_dev); 171 } 172 173 static int dmard06_suspend(struct device *dev) 174 { 175 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 176 struct dmard06_data *dmard06 = iio_priv(indio_dev); 177 int ret; 178 179 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, 180 DMARD06_MODE_POWERDOWN); 181 if (ret < 0) 182 return ret; 183 184 return 0; 185 } 186 187 static int dmard06_resume(struct device *dev) 188 { 189 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 190 struct dmard06_data *dmard06 = iio_priv(indio_dev); 191 int ret; 192 193 ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, 194 DMARD06_MODE_NORMAL); 195 if (ret < 0) 196 return ret; 197 198 return 0; 199 } 200 201 static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, 202 dmard06_resume); 203 204 static const struct i2c_device_id dmard06_id[] = { 205 { "dmard05", 0 }, 206 { "dmard06", 0 }, 207 { "dmard07", 0 }, 208 { } 209 }; 210 MODULE_DEVICE_TABLE(i2c, dmard06_id); 211 212 static const struct of_device_id dmard06_of_match[] = { 213 { .compatible = "domintech,dmard05" }, 214 { .compatible = "domintech,dmard06" }, 215 { .compatible = "domintech,dmard07" }, 216 { } 217 }; 218 MODULE_DEVICE_TABLE(of, dmard06_of_match); 219 220 static struct i2c_driver dmard06_driver = { 221 .probe = dmard06_probe, 222 .id_table = dmard06_id, 223 .driver = { 224 .name = DMARD06_DRV_NAME, 225 .of_match_table = dmard06_of_match, 226 .pm = pm_sleep_ptr(&dmard06_pm_ops), 227 }, 228 }; 229 module_i2c_driver(dmard06_driver); 230 231 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>"); 232 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver"); 233 MODULE_LICENSE("GPL v2"); 234