1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * mCube MC3230 3-Axis Accelerometer 4 * 5 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> 6 * 7 * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c. 8 */ 9 10 #include <linux/i2c.h> 11 #include <linux/module.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/sysfs.h> 14 15 #define MC3230_REG_XOUT 0x00 16 #define MC3230_REG_YOUT 0x01 17 #define MC3230_REG_ZOUT 0x02 18 19 #define MC3230_REG_MODE 0x07 20 #define MC3230_MODE_OPCON_MASK 0x03 21 #define MC3230_MODE_OPCON_WAKE 0x01 22 #define MC3230_MODE_OPCON_STANDBY 0x03 23 24 #define MC3230_REG_CHIP_ID 0x18 25 #define MC3230_REG_PRODUCT_CODE 0x3b 26 27 /* 28 * The accelerometer has one measurement range: 29 * 30 * -1.5g - +1.5g (8-bit, signed) 31 * 32 */ 33 34 struct mc3230_chip_info { 35 const char *name; 36 const u8 chip_id; 37 const u8 product_code; 38 const int scale; 39 }; 40 41 static const struct mc3230_chip_info mc3230_chip_info = { 42 .name = "mc3230", 43 .chip_id = 0x01, 44 .product_code = 0x19, 45 /* (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 */ 46 .scale = 115411765, 47 }; 48 49 static const struct mc3230_chip_info mc3510c_chip_info = { 50 .name = "mc3510c", 51 .chip_id = 0x23, 52 .product_code = 0x10, 53 /* Was obtained empirically */ 54 .scale = 625000000, 55 }; 56 57 #define MC3230_CHANNEL(reg, axis) { \ 58 .type = IIO_ACCEL, \ 59 .address = reg, \ 60 .modified = 1, \ 61 .channel2 = IIO_MOD_##axis, \ 62 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 63 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 64 .ext_info = mc3230_ext_info, \ 65 } 66 67 struct mc3230_data { 68 const struct mc3230_chip_info *chip_info; 69 struct i2c_client *client; 70 struct iio_mount_matrix orientation; 71 }; 72 73 static const struct iio_mount_matrix * 74 mc3230_get_mount_matrix(const struct iio_dev *indio_dev, 75 const struct iio_chan_spec *chan) 76 { 77 struct mc3230_data *data = iio_priv(indio_dev); 78 79 return &data->orientation; 80 } 81 82 static const struct iio_chan_spec_ext_info mc3230_ext_info[] = { 83 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, mc3230_get_mount_matrix), 84 { } 85 }; 86 87 static const struct iio_chan_spec mc3230_channels[] = { 88 MC3230_CHANNEL(MC3230_REG_XOUT, X), 89 MC3230_CHANNEL(MC3230_REG_YOUT, Y), 90 MC3230_CHANNEL(MC3230_REG_ZOUT, Z), 91 }; 92 93 static int mc3230_set_opcon(struct mc3230_data *data, int opcon) 94 { 95 int ret; 96 struct i2c_client *client = data->client; 97 98 ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE); 99 if (ret < 0) { 100 dev_err(&client->dev, "failed to read mode reg: %d\n", ret); 101 return ret; 102 } 103 104 ret &= ~MC3230_MODE_OPCON_MASK; 105 ret |= opcon; 106 107 ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret); 108 if (ret < 0) { 109 dev_err(&client->dev, "failed to write mode reg: %d\n", ret); 110 return ret; 111 } 112 113 return 0; 114 } 115 116 static int mc3230_read_raw(struct iio_dev *indio_dev, 117 struct iio_chan_spec const *chan, 118 int *val, int *val2, long mask) 119 { 120 struct mc3230_data *data = iio_priv(indio_dev); 121 int ret; 122 123 switch (mask) { 124 case IIO_CHAN_INFO_RAW: 125 ret = i2c_smbus_read_byte_data(data->client, chan->address); 126 if (ret < 0) 127 return ret; 128 *val = sign_extend32(ret, 7); 129 return IIO_VAL_INT; 130 case IIO_CHAN_INFO_SCALE: 131 *val = 0; 132 *val2 = data->chip_info->scale; 133 return IIO_VAL_INT_PLUS_NANO; 134 default: 135 return -EINVAL; 136 } 137 } 138 139 static const struct iio_info mc3230_info = { 140 .read_raw = mc3230_read_raw, 141 }; 142 143 static int mc3230_probe(struct i2c_client *client) 144 { 145 int ret; 146 struct iio_dev *indio_dev; 147 struct mc3230_data *data; 148 const struct mc3230_chip_info *chip_info; 149 150 chip_info = i2c_get_match_data(client); 151 if (chip_info == NULL) { 152 dev_err(&client->dev, "failed to get match data"); 153 return -ENODATA; 154 } 155 156 /* First check chip-id and product-id */ 157 ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); 158 if (ret != chip_info->chip_id) { 159 dev_info(&client->dev, 160 "chip id check fail: 0x%x != 0x%x !\n", 161 ret, chip_info->chip_id); 162 } 163 164 ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); 165 if (ret != chip_info->product_code) { 166 dev_info(&client->dev, 167 "product code check fail: 0x%x != 0x%x !\n", 168 ret, chip_info->product_code); 169 } 170 171 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 172 if (!indio_dev) { 173 dev_err(&client->dev, "iio allocation failed!\n"); 174 return -ENOMEM; 175 } 176 177 data = iio_priv(indio_dev); 178 data->chip_info = chip_info; 179 data->client = client; 180 i2c_set_clientdata(client, indio_dev); 181 182 indio_dev->info = &mc3230_info; 183 indio_dev->name = chip_info->name; 184 indio_dev->modes = INDIO_DIRECT_MODE; 185 indio_dev->channels = mc3230_channels; 186 indio_dev->num_channels = ARRAY_SIZE(mc3230_channels); 187 188 ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); 189 if (ret < 0) 190 return ret; 191 192 ret = iio_read_mount_matrix(&client->dev, &data->orientation); 193 if (ret) 194 return ret; 195 196 ret = iio_device_register(indio_dev); 197 if (ret < 0) { 198 dev_err(&client->dev, "device_register failed\n"); 199 mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); 200 } 201 202 return ret; 203 } 204 205 static void mc3230_remove(struct i2c_client *client) 206 { 207 struct iio_dev *indio_dev = i2c_get_clientdata(client); 208 209 iio_device_unregister(indio_dev); 210 211 mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); 212 } 213 214 static int mc3230_suspend(struct device *dev) 215 { 216 struct mc3230_data *data; 217 218 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); 219 220 return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); 221 } 222 223 static int mc3230_resume(struct device *dev) 224 { 225 struct mc3230_data *data; 226 227 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); 228 229 return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); 230 } 231 232 static DEFINE_SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume); 233 234 static const struct i2c_device_id mc3230_i2c_id[] = { 235 { "mc3230", (kernel_ulong_t)&mc3230_chip_info }, 236 { "mc3510c", (kernel_ulong_t)&mc3510c_chip_info }, 237 { } 238 }; 239 MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); 240 241 static const struct of_device_id mc3230_of_match[] = { 242 { .compatible = "mcube,mc3230", &mc3230_chip_info }, 243 { .compatible = "mcube,mc3510c", &mc3510c_chip_info }, 244 { } 245 }; 246 MODULE_DEVICE_TABLE(of, mc3230_of_match); 247 248 static struct i2c_driver mc3230_driver = { 249 .driver = { 250 .name = "mc3230", 251 .of_match_table = mc3230_of_match, 252 .pm = pm_sleep_ptr(&mc3230_pm_ops), 253 }, 254 .probe = mc3230_probe, 255 .remove = mc3230_remove, 256 .id_table = mc3230_i2c_id, 257 }; 258 259 module_i2c_driver(mc3230_driver); 260 261 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 262 MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); 263 MODULE_LICENSE("GPL v2"); 264