1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IIO driver for the MiraMEMS DA217 and DA280 3-axis accelerometer and 4 * IIO driver for the MiraMEMS DA226 2-axis accelerometer 5 * 6 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/i2c.h> 11 #include <linux/acpi.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/sysfs.h> 14 #include <linux/byteorder/generic.h> 15 16 #define DA280_REG_CHIP_ID 0x01 17 #define DA280_REG_ACC_X_LSB 0x02 18 #define DA280_REG_ACC_Y_LSB 0x04 19 #define DA280_REG_ACC_Z_LSB 0x06 20 #define DA280_REG_MODE_BW 0x11 21 22 #define DA280_CHIP_ID 0x13 23 #define DA280_MODE_ENABLE 0x1e 24 #define DA280_MODE_DISABLE 0x9e 25 26 /* 27 * a value of + or -4096 corresponds to + or - 1G 28 * scale = 9.81 / 4096 = 0.002395019 29 */ 30 31 static const int da280_nscale = 2395019; 32 33 #define DA280_CHANNEL(reg, axis) { \ 34 .type = IIO_ACCEL, \ 35 .address = reg, \ 36 .modified = 1, \ 37 .channel2 = IIO_MOD_##axis, \ 38 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 39 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 40 } 41 42 static const struct iio_chan_spec da280_channels[] = { 43 DA280_CHANNEL(DA280_REG_ACC_X_LSB, X), 44 DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y), 45 DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z), 46 }; 47 48 struct da280_match_data { 49 const char *name; 50 int num_channels; 51 }; 52 53 struct da280_data { 54 struct i2c_client *client; 55 }; 56 57 static int da280_enable(struct i2c_client *client, bool enable) 58 { 59 u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE; 60 61 return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data); 62 } 63 64 static int da280_read_raw(struct iio_dev *indio_dev, 65 struct iio_chan_spec const *chan, 66 int *val, int *val2, long mask) 67 { 68 struct da280_data *data = iio_priv(indio_dev); 69 int ret; 70 71 switch (mask) { 72 case IIO_CHAN_INFO_RAW: 73 ret = i2c_smbus_read_word_data(data->client, chan->address); 74 if (ret < 0) 75 return ret; 76 /* 77 * Values are 14 bits, stored as 16 bits with the 2 78 * least significant bits always 0. 79 */ 80 *val = (short)ret >> 2; 81 return IIO_VAL_INT; 82 case IIO_CHAN_INFO_SCALE: 83 *val = 0; 84 *val2 = da280_nscale; 85 return IIO_VAL_INT_PLUS_NANO; 86 default: 87 return -EINVAL; 88 } 89 } 90 91 static const struct iio_info da280_info = { 92 .read_raw = da280_read_raw, 93 }; 94 95 static void da280_disable(void *client) 96 { 97 da280_enable(client, false); 98 } 99 100 static int da280_probe(struct i2c_client *client) 101 { 102 const struct da280_match_data *match_data; 103 struct iio_dev *indio_dev; 104 struct da280_data *data; 105 int ret; 106 107 ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID); 108 if (ret != DA280_CHIP_ID) 109 return (ret < 0) ? ret : -ENODEV; 110 111 match_data = i2c_get_match_data(client); 112 if (!match_data) { 113 dev_err(&client->dev, "Error match-data not set\n"); 114 return -EINVAL; 115 } 116 117 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 118 if (!indio_dev) 119 return -ENOMEM; 120 121 data = iio_priv(indio_dev); 122 data->client = client; 123 124 indio_dev->info = &da280_info; 125 indio_dev->modes = INDIO_DIRECT_MODE; 126 indio_dev->channels = da280_channels; 127 indio_dev->num_channels = match_data->num_channels; 128 indio_dev->name = match_data->name; 129 130 ret = da280_enable(client, true); 131 if (ret < 0) 132 return ret; 133 134 ret = devm_add_action_or_reset(&client->dev, da280_disable, client); 135 if (ret) 136 return ret; 137 138 return devm_iio_device_register(&client->dev, indio_dev); 139 } 140 141 static int da280_suspend(struct device *dev) 142 { 143 return da280_enable(to_i2c_client(dev), false); 144 } 145 146 static int da280_resume(struct device *dev) 147 { 148 return da280_enable(to_i2c_client(dev), true); 149 } 150 151 static DEFINE_SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume); 152 153 static const struct da280_match_data da217_match_data = { "da217", 3 }; 154 static const struct da280_match_data da226_match_data = { "da226", 2 }; 155 static const struct da280_match_data da280_match_data = { "da280", 3 }; 156 157 static const struct acpi_device_id da280_acpi_match[] = { 158 { "NSA2513", (kernel_ulong_t)&da217_match_data }, 159 { "MIRAACC", (kernel_ulong_t)&da280_match_data }, 160 {} 161 }; 162 MODULE_DEVICE_TABLE(acpi, da280_acpi_match); 163 164 static const struct i2c_device_id da280_i2c_id[] = { 165 { "da217", (kernel_ulong_t)&da217_match_data }, 166 { "da226", (kernel_ulong_t)&da226_match_data }, 167 { "da280", (kernel_ulong_t)&da280_match_data }, 168 {} 169 }; 170 MODULE_DEVICE_TABLE(i2c, da280_i2c_id); 171 172 static struct i2c_driver da280_driver = { 173 .driver = { 174 .name = "da280", 175 .acpi_match_table = da280_acpi_match, 176 .pm = pm_sleep_ptr(&da280_pm_ops), 177 }, 178 .probe = da280_probe, 179 .id_table = da280_i2c_id, 180 }; 181 182 module_i2c_driver(da280_driver); 183 184 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 185 MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver"); 186 MODULE_LICENSE("GPL v2"); 187