1 /* 2 * Copyright (C) 2012 Invensense, Inc. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 #include <linux/i2c.h> 14 #include <linux/kfifo.h> 15 #include <linux/spinlock.h> 16 #include <linux/iio/iio.h> 17 #include <linux/iio/buffer.h> 18 #include <linux/iio/sysfs.h> 19 #include <linux/iio/kfifo_buf.h> 20 #include <linux/iio/trigger.h> 21 #include <linux/iio/triggered_buffer.h> 22 #include <linux/iio/trigger_consumer.h> 23 #include <linux/platform_data/invensense_mpu6050.h> 24 25 /** 26 * struct inv_mpu6050_reg_map - Notable registers. 27 * @sample_rate_div: Divider applied to gyro output rate. 28 * @lpf: Configures internal low pass filter. 29 * @user_ctrl: Enables/resets the FIFO. 30 * @fifo_en: Determines which data will appear in FIFO. 31 * @gyro_config: gyro config register. 32 * @accl_config: accel config register 33 * @fifo_count_h: Upper byte of FIFO count. 34 * @fifo_r_w: FIFO register. 35 * @raw_gyro: Address of first gyro register. 36 * @raw_accl: Address of first accel register. 37 * @temperature: temperature register 38 * @int_enable: Interrupt enable register. 39 * @pwr_mgmt_1: Controls chip's power state and clock source. 40 * @pwr_mgmt_2: Controls power state of individual sensors. 41 */ 42 struct inv_mpu6050_reg_map { 43 u8 sample_rate_div; 44 u8 lpf; 45 u8 user_ctrl; 46 u8 fifo_en; 47 u8 gyro_config; 48 u8 accl_config; 49 u8 fifo_count_h; 50 u8 fifo_r_w; 51 u8 raw_gyro; 52 u8 raw_accl; 53 u8 temperature; 54 u8 int_enable; 55 u8 pwr_mgmt_1; 56 u8 pwr_mgmt_2; 57 u8 int_pin_cfg; 58 }; 59 60 /*device enum */ 61 enum inv_devices { 62 INV_MPU6050, 63 INV_MPU6500, 64 INV_NUM_PARTS 65 }; 66 67 /** 68 * struct inv_mpu6050_chip_config - Cached chip configuration data. 69 * @fsr: Full scale range. 70 * @lpf: Digital low pass filter frequency. 71 * @accl_fs: accel full scale range. 72 * @enable: master enable state. 73 * @accl_fifo_enable: enable accel data output 74 * @gyro_fifo_enable: enable gyro data output 75 * @fifo_rate: FIFO update rate. 76 */ 77 struct inv_mpu6050_chip_config { 78 unsigned int fsr:2; 79 unsigned int lpf:3; 80 unsigned int accl_fs:2; 81 unsigned int enable:1; 82 unsigned int accl_fifo_enable:1; 83 unsigned int gyro_fifo_enable:1; 84 u16 fifo_rate; 85 }; 86 87 /** 88 * struct inv_mpu6050_hw - Other important hardware information. 89 * @num_reg: Number of registers on device. 90 * @name: name of the chip. 91 * @reg: register map of the chip. 92 * @config: configuration of the chip. 93 */ 94 struct inv_mpu6050_hw { 95 u8 num_reg; 96 u8 *name; 97 const struct inv_mpu6050_reg_map *reg; 98 const struct inv_mpu6050_chip_config *config; 99 }; 100 101 /* 102 * struct inv_mpu6050_state - Driver state variables. 103 * @TIMESTAMP_FIFO_SIZE: fifo size for timestamp. 104 * @trig: IIO trigger. 105 * @chip_config: Cached attribute information. 106 * @reg: Map of important registers. 107 * @hw: Other hardware-specific information. 108 * @chip_type: chip type. 109 * @time_stamp_lock: spin lock to time stamp. 110 * @client: i2c client handle. 111 * @plat_data: platform data. 112 * @timestamps: kfifo queue to store time stamp. 113 */ 114 struct inv_mpu6050_state { 115 #define TIMESTAMP_FIFO_SIZE 16 116 struct iio_trigger *trig; 117 struct inv_mpu6050_chip_config chip_config; 118 const struct inv_mpu6050_reg_map *reg; 119 const struct inv_mpu6050_hw *hw; 120 enum inv_devices chip_type; 121 spinlock_t time_stamp_lock; 122 struct i2c_client *client; 123 struct i2c_adapter *mux_adapter; 124 struct i2c_client *mux_client; 125 unsigned int powerup_count; 126 struct inv_mpu6050_platform_data plat_data; 127 DECLARE_KFIFO(timestamps, long long, TIMESTAMP_FIFO_SIZE); 128 }; 129 130 /*register and associated bit definition*/ 131 #define INV_MPU6050_REG_SAMPLE_RATE_DIV 0x19 132 #define INV_MPU6050_REG_CONFIG 0x1A 133 #define INV_MPU6050_REG_GYRO_CONFIG 0x1B 134 #define INV_MPU6050_REG_ACCEL_CONFIG 0x1C 135 136 #define INV_MPU6050_REG_FIFO_EN 0x23 137 #define INV_MPU6050_BIT_ACCEL_OUT 0x08 138 #define INV_MPU6050_BITS_GYRO_OUT 0x70 139 140 #define INV_MPU6050_REG_INT_ENABLE 0x38 141 #define INV_MPU6050_BIT_DATA_RDY_EN 0x01 142 #define INV_MPU6050_BIT_DMP_INT_EN 0x02 143 144 #define INV_MPU6050_REG_RAW_ACCEL 0x3B 145 #define INV_MPU6050_REG_TEMPERATURE 0x41 146 #define INV_MPU6050_REG_RAW_GYRO 0x43 147 148 #define INV_MPU6050_REG_USER_CTRL 0x6A 149 #define INV_MPU6050_BIT_FIFO_RST 0x04 150 #define INV_MPU6050_BIT_DMP_RST 0x08 151 #define INV_MPU6050_BIT_I2C_MST_EN 0x20 152 #define INV_MPU6050_BIT_FIFO_EN 0x40 153 #define INV_MPU6050_BIT_DMP_EN 0x80 154 155 #define INV_MPU6050_REG_PWR_MGMT_1 0x6B 156 #define INV_MPU6050_BIT_H_RESET 0x80 157 #define INV_MPU6050_BIT_SLEEP 0x40 158 #define INV_MPU6050_BIT_CLK_MASK 0x7 159 160 #define INV_MPU6050_REG_PWR_MGMT_2 0x6C 161 #define INV_MPU6050_BIT_PWR_ACCL_STBY 0x38 162 #define INV_MPU6050_BIT_PWR_GYRO_STBY 0x07 163 164 #define INV_MPU6050_REG_FIFO_COUNT_H 0x72 165 #define INV_MPU6050_REG_FIFO_R_W 0x74 166 167 #define INV_MPU6050_BYTES_PER_3AXIS_SENSOR 6 168 #define INV_MPU6050_FIFO_COUNT_BYTE 2 169 #define INV_MPU6050_FIFO_THRESHOLD 500 170 #define INV_MPU6050_POWER_UP_TIME 100 171 #define INV_MPU6050_TEMP_UP_TIME 100 172 #define INV_MPU6050_SENSOR_UP_TIME 30 173 #define INV_MPU6050_REG_UP_TIME 5 174 175 #define INV_MPU6050_TEMP_OFFSET 12421 176 #define INV_MPU6050_TEMP_SCALE 2941 177 #define INV_MPU6050_MAX_GYRO_FS_PARAM 3 178 #define INV_MPU6050_MAX_ACCL_FS_PARAM 3 179 #define INV_MPU6050_THREE_AXIS 3 180 #define INV_MPU6050_GYRO_CONFIG_FSR_SHIFT 3 181 #define INV_MPU6050_ACCL_CONFIG_FSR_SHIFT 3 182 183 /* 6 + 6 round up and plus 8 */ 184 #define INV_MPU6050_OUTPUT_DATA_SIZE 24 185 186 #define INV_MPU6050_REG_INT_PIN_CFG 0x37 187 #define INV_MPU6050_BIT_BYPASS_EN 0x2 188 189 /* init parameters */ 190 #define INV_MPU6050_INIT_FIFO_RATE 50 191 #define INV_MPU6050_TIME_STAMP_TOR 5 192 #define INV_MPU6050_MAX_FIFO_RATE 1000 193 #define INV_MPU6050_MIN_FIFO_RATE 4 194 #define INV_MPU6050_ONE_K_HZ 1000 195 196 /* scan element definition */ 197 enum inv_mpu6050_scan { 198 INV_MPU6050_SCAN_ACCL_X, 199 INV_MPU6050_SCAN_ACCL_Y, 200 INV_MPU6050_SCAN_ACCL_Z, 201 INV_MPU6050_SCAN_GYRO_X, 202 INV_MPU6050_SCAN_GYRO_Y, 203 INV_MPU6050_SCAN_GYRO_Z, 204 INV_MPU6050_SCAN_TIMESTAMP, 205 }; 206 207 enum inv_mpu6050_filter_e { 208 INV_MPU6050_FILTER_256HZ_NOLPF2 = 0, 209 INV_MPU6050_FILTER_188HZ, 210 INV_MPU6050_FILTER_98HZ, 211 INV_MPU6050_FILTER_42HZ, 212 INV_MPU6050_FILTER_20HZ, 213 INV_MPU6050_FILTER_10HZ, 214 INV_MPU6050_FILTER_5HZ, 215 INV_MPU6050_FILTER_2100HZ_NOLPF, 216 NUM_MPU6050_FILTER 217 }; 218 219 /* IIO attribute address */ 220 enum INV_MPU6050_IIO_ATTR_ADDR { 221 ATTR_GYRO_MATRIX, 222 ATTR_ACCL_MATRIX, 223 }; 224 225 enum inv_mpu6050_accl_fs_e { 226 INV_MPU6050_FS_02G = 0, 227 INV_MPU6050_FS_04G, 228 INV_MPU6050_FS_08G, 229 INV_MPU6050_FS_16G, 230 NUM_ACCL_FSR 231 }; 232 233 enum inv_mpu6050_fsr_e { 234 INV_MPU6050_FSR_250DPS = 0, 235 INV_MPU6050_FSR_500DPS, 236 INV_MPU6050_FSR_1000DPS, 237 INV_MPU6050_FSR_2000DPS, 238 NUM_MPU6050_FSR 239 }; 240 241 enum inv_mpu6050_clock_sel_e { 242 INV_CLK_INTERNAL = 0, 243 INV_CLK_PLL, 244 NUM_CLK 245 }; 246 247 irqreturn_t inv_mpu6050_irq_handler(int irq, void *p); 248 irqreturn_t inv_mpu6050_read_fifo(int irq, void *p); 249 int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev); 250 void inv_mpu6050_remove_trigger(struct inv_mpu6050_state *st); 251 int inv_reset_fifo(struct iio_dev *indio_dev); 252 int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en, u32 mask); 253 int inv_mpu6050_write_reg(struct inv_mpu6050_state *st, int reg, u8 val); 254 int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on); 255 int inv_mpu_acpi_create_mux_client(struct inv_mpu6050_state *st); 256 void inv_mpu_acpi_delete_mux_client(struct inv_mpu6050_state *st); 257