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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 | // SPDX-License-Identifier: GPL-2.0-only /* * IIO driver for the MiraMEMS DA311 3-axis accelerometer * * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> * Copyright (c) 2011-2013 MiraMEMS Sensing Technology Co., Ltd. */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/byteorder/generic.h> #define DA311_CHIP_ID 0x13 /* * Note register addressed go from 0 - 0x3f and then wrap. * For some reason there are 2 banks with 0 - 0x3f addresses, * rather then a single 0-0x7f bank. */ /* Bank 0 regs */ #define DA311_REG_BANK 0x0000 #define DA311_REG_LDO_REG 0x0006 #define DA311_REG_CHIP_ID 0x000f #define DA311_REG_TEMP_CFG_REG 0x001f #define DA311_REG_CTRL_REG1 0x0020 #define DA311_REG_CTRL_REG3 0x0022 #define DA311_REG_CTRL_REG4 0x0023 #define DA311_REG_CTRL_REG5 0x0024 #define DA311_REG_CTRL_REG6 0x0025 #define DA311_REG_STATUS_REG 0x0027 #define DA311_REG_OUT_X_L 0x0028 #define DA311_REG_OUT_X_H 0x0029 #define DA311_REG_OUT_Y_L 0x002a #define DA311_REG_OUT_Y_H 0x002b #define DA311_REG_OUT_Z_L 0x002c #define DA311_REG_OUT_Z_H 0x002d #define DA311_REG_INT1_CFG 0x0030 #define DA311_REG_INT1_SRC 0x0031 #define DA311_REG_INT1_THS 0x0032 #define DA311_REG_INT1_DURATION 0x0033 #define DA311_REG_INT2_CFG 0x0034 #define DA311_REG_INT2_SRC 0x0035 #define DA311_REG_INT2_THS 0x0036 #define DA311_REG_INT2_DURATION 0x0037 #define DA311_REG_CLICK_CFG 0x0038 #define DA311_REG_CLICK_SRC 0x0039 #define DA311_REG_CLICK_THS 0x003a #define DA311_REG_TIME_LIMIT 0x003b #define DA311_REG_TIME_LATENCY 0x003c #define DA311_REG_TIME_WINDOW 0x003d /* Bank 1 regs */ #define DA311_REG_SOFT_RESET 0x0105 #define DA311_REG_OTP_XOFF_L 0x0110 #define DA311_REG_OTP_XOFF_H 0x0111 #define DA311_REG_OTP_YOFF_L 0x0112 #define DA311_REG_OTP_YOFF_H 0x0113 #define DA311_REG_OTP_ZOFF_L 0x0114 #define DA311_REG_OTP_ZOFF_H 0x0115 #define DA311_REG_OTP_XSO 0x0116 #define DA311_REG_OTP_YSO 0x0117 #define DA311_REG_OTP_ZSO 0x0118 #define DA311_REG_OTP_TRIM_OSC 0x011b #define DA311_REG_LPF_ABSOLUTE 0x011c #define DA311_REG_TEMP_OFF1 0x0127 #define DA311_REG_TEMP_OFF2 0x0128 #define DA311_REG_TEMP_OFF3 0x0129 #define DA311_REG_OTP_TRIM_THERM_H 0x011a /* * a value of + or -1024 corresponds to + or - 1G * scale = 9.81 / 1024 = 0.009580078 */ static const int da311_nscale = 9580078; #define DA311_CHANNEL(reg, axis) { \ .type = IIO_ACCEL, \ .address = reg, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ } static const struct iio_chan_spec da311_channels[] = { /* | 0x80 comes from the android driver */ DA311_CHANNEL(DA311_REG_OUT_X_L | 0x80, X), DA311_CHANNEL(DA311_REG_OUT_Y_L | 0x80, Y), DA311_CHANNEL(DA311_REG_OUT_Z_L | 0x80, Z), }; struct da311_data { struct i2c_client *client; }; static int da311_register_mask_write(struct i2c_client *client, u16 addr, u8 mask, u8 data) { int ret; u8 tmp_data = 0; if (addr & 0xff00) { /* Select bank 1 */ ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x01); if (ret < 0) return ret; } if (mask != 0xff) { ret = i2c_smbus_read_byte_data(client, addr); if (ret < 0) return ret; tmp_data = ret; } tmp_data &= ~mask; tmp_data |= data & mask; ret = i2c_smbus_write_byte_data(client, addr & 0xff, tmp_data); if (ret < 0) return ret; if (addr & 0xff00) { /* Back to bank 0 */ ret = i2c_smbus_write_byte_data(client, DA311_REG_BANK, 0x00); if (ret < 0) return ret; } return 0; } /* Init sequence taken from the android driver */ static int da311_reset(struct i2c_client *client) { static const struct { u16 addr; u8 mask; u8 data; } init_data[] = { { DA311_REG_TEMP_CFG_REG, 0xff, 0x08 }, { DA311_REG_CTRL_REG5, 0xff, 0x80 }, { DA311_REG_CTRL_REG4, 0x30, 0x00 }, { DA311_REG_CTRL_REG1, 0xff, 0x6f }, { DA311_REG_TEMP_CFG_REG, 0xff, 0x88 }, { DA311_REG_LDO_REG, 0xff, 0x02 }, { DA311_REG_OTP_TRIM_OSC, 0xff, 0x27 }, { DA311_REG_LPF_ABSOLUTE, 0xff, 0x30 }, { DA311_REG_TEMP_OFF1, 0xff, 0x3f }, { DA311_REG_TEMP_OFF2, 0xff, 0xff }, { DA311_REG_TEMP_OFF3, 0xff, 0x0f }, }; int i, ret; /* Reset */ ret = da311_register_mask_write(client, DA311_REG_SOFT_RESET, 0xff, 0xaa); if (ret < 0) return ret; for (i = 0; i < ARRAY_SIZE(init_data); i++) { ret = da311_register_mask_write(client, init_data[i].addr, init_data[i].mask, init_data[i].data); if (ret < 0) return ret; } return 0; } static int da311_enable(struct i2c_client *client, bool enable) { u8 data = enable ? 0x00 : 0x20; return da311_register_mask_write(client, DA311_REG_TEMP_CFG_REG, 0x20, data); } static int da311_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct da311_data *data = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: ret = i2c_smbus_read_word_data(data->client, chan->address); if (ret < 0) return ret; /* * Values are 12 bits, stored as 16 bits with the 4 * least significant bits always 0. */ *val = (short)ret >> 4; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = 0; *val2 = da311_nscale; return IIO_VAL_INT_PLUS_NANO; default: return -EINVAL; } } static const struct iio_info da311_info = { .read_raw = da311_read_raw, }; static void da311_disable(void *client) { da311_enable(client, false); } static int da311_probe(struct i2c_client *client, const struct i2c_device_id *id) { int ret; struct iio_dev *indio_dev; struct da311_data *data; ret = i2c_smbus_read_byte_data(client, DA311_REG_CHIP_ID); if (ret != DA311_CHIP_ID) return (ret < 0) ? ret : -ENODEV; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; data = iio_priv(indio_dev); data->client = client; indio_dev->info = &da311_info; indio_dev->name = "da311"; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = da311_channels; indio_dev->num_channels = ARRAY_SIZE(da311_channels); ret = da311_reset(client); if (ret < 0) return ret; ret = da311_enable(client, true); if (ret < 0) return ret; ret = devm_add_action_or_reset(&client->dev, da311_disable, client); if (ret) return ret; return devm_iio_device_register(&client->dev, indio_dev); } static int da311_suspend(struct device *dev) { return da311_enable(to_i2c_client(dev), false); } static int da311_resume(struct device *dev) { return da311_enable(to_i2c_client(dev), true); } static DEFINE_SIMPLE_DEV_PM_OPS(da311_pm_ops, da311_suspend, da311_resume); static const struct i2c_device_id da311_i2c_id[] = { {"da311", 0}, {} }; MODULE_DEVICE_TABLE(i2c, da311_i2c_id); static struct i2c_driver da311_driver = { .driver = { .name = "da311", .pm = pm_sleep_ptr(&da311_pm_ops), }, .probe = da311_probe, .id_table = da311_i2c_id, }; module_i2c_driver(da311_driver); MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); MODULE_DESCRIPTION("MiraMEMS DA311 3-Axis Accelerometer driver"); MODULE_LICENSE("GPL v2"); |