| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Martin Kepplinger | 3441 | 42.22% | 18 | 40.00% |
| Martin Fuzzey | 2241 | 27.49% | 7 | 15.56% |
| Peter Meerwald-Stadler | 1585 | 19.45% | 1 | 2.22% |
| Harinath Nampally | 615 | 7.55% | 6 | 13.33% |
| Richard Tresidder | 104 | 1.28% | 1 | 2.22% |
| Hartmut Knaack | 72 | 0.88% | 4 | 8.89% |
| Jonathan Cameron | 62 | 0.76% | 1 | 2.22% |
| Alison Schofield | 13 | 0.16% | 1 | 2.22% |
| Grégor Boirie | 6 | 0.07% | 1 | 2.22% |
| Bijosh Thykkoottathil | 6 | 0.07% | 2 | 4.44% |
| Leonard Crestez | 4 | 0.05% | 1 | 2.22% |
| Lars-Peter Clausen | 1 | 0.01% | 1 | 2.22% |
| Gustavo A. R. Silva | 1 | 0.01% | 1 | 2.22% |
| Total | 8151 | 45 |
// SPDX-License-Identifier: GPL-2.0 /* * mma8452.c - Support for following Freescale / NXP 3-axis accelerometers: * * device name digital output 7-bit I2C slave address (pin selectable) * --------------------------------------------------------------------- * MMA8451Q 14 bit 0x1c / 0x1d * MMA8452Q 12 bit 0x1c / 0x1d * MMA8453Q 10 bit 0x1c / 0x1d * MMA8652FC 12 bit 0x1d * MMA8653FC 10 bit 0x1d * FXLS8471Q 14 bit 0x1e / 0x1d / 0x1c / 0x1f * * Copyright 2015 Martin Kepplinger <martink@posteo.de> * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net> * * * TODO: orientation events */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/events.h> #include <linux/delay.h> #include <linux/of_device.h> #include <linux/of_irq.h> #include <linux/pm_runtime.h> #define MMA8452_STATUS 0x00 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) #define MMA8452_OUT_X 0x01 /* MSB first */ #define MMA8452_OUT_Y 0x03 #define MMA8452_OUT_Z 0x05 #define MMA8452_INT_SRC 0x0c #define MMA8452_WHO_AM_I 0x0d #define MMA8452_DATA_CFG 0x0e #define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0) #define MMA8452_DATA_CFG_FS_2G 0 #define MMA8452_DATA_CFG_FS_4G 1 #define MMA8452_DATA_CFG_FS_8G 2 #define MMA8452_DATA_CFG_HPF_MASK BIT(4) #define MMA8452_HP_FILTER_CUTOFF 0x0f #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0) #define MMA8452_FF_MT_CFG 0x15 #define MMA8452_FF_MT_CFG_OAE BIT(6) #define MMA8452_FF_MT_CFG_ELE BIT(7) #define MMA8452_FF_MT_SRC 0x16 #define MMA8452_FF_MT_SRC_XHE BIT(1) #define MMA8452_FF_MT_SRC_YHE BIT(3) #define MMA8452_FF_MT_SRC_ZHE BIT(5) #define MMA8452_FF_MT_THS 0x17 #define MMA8452_FF_MT_THS_MASK 0x7f #define MMA8452_FF_MT_COUNT 0x18 #define MMA8452_FF_MT_CHAN_SHIFT 3 #define MMA8452_TRANSIENT_CFG 0x1d #define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1) #define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0) #define MMA8452_TRANSIENT_CFG_ELE BIT(4) #define MMA8452_TRANSIENT_SRC 0x1e #define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1) #define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3) #define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5) #define MMA8452_TRANSIENT_THS 0x1f #define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0) #define MMA8452_TRANSIENT_COUNT 0x20 #define MMA8452_TRANSIENT_CHAN_SHIFT 1 #define MMA8452_CTRL_REG1 0x2a #define MMA8452_CTRL_ACTIVE BIT(0) #define MMA8452_CTRL_DR_MASK GENMASK(5, 3) #define MMA8452_CTRL_DR_SHIFT 3 #define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */ #define MMA8452_CTRL_REG2 0x2b #define MMA8452_CTRL_REG2_RST BIT(6) #define MMA8452_CTRL_REG2_MODS_SHIFT 3 #define MMA8452_CTRL_REG2_MODS_MASK 0x1b #define MMA8452_CTRL_REG4 0x2d #define MMA8452_CTRL_REG5 0x2e #define MMA8452_OFF_X 0x2f #define MMA8452_OFF_Y 0x30 #define MMA8452_OFF_Z 0x31 #define MMA8452_MAX_REG 0x31 #define MMA8452_INT_DRDY BIT(0) #define MMA8452_INT_FF_MT BIT(2) #define MMA8452_INT_TRANS BIT(5) #define MMA8451_DEVICE_ID 0x1a #define MMA8452_DEVICE_ID 0x2a #define MMA8453_DEVICE_ID 0x3a #define MMA8652_DEVICE_ID 0x4a #define MMA8653_DEVICE_ID 0x5a #define FXLS8471_DEVICE_ID 0x6a #define MMA8452_AUTO_SUSPEND_DELAY_MS 2000 struct mma8452_data { struct i2c_client *client; struct mutex lock; u8 ctrl_reg1; u8 data_cfg; const struct mma_chip_info *chip_info; int sleep_val; }; /** * struct mma8452_event_regs - chip specific data related to events * @ev_cfg: event config register address * @ev_cfg_ele: latch bit in event config register * @ev_cfg_chan_shift: number of the bit to enable events in X * direction; in event config register * @ev_src: event source register address * @ev_ths: event threshold register address * @ev_ths_mask: mask for the threshold value * @ev_count: event count (period) register address * * Since not all chips supported by the driver support comparing high pass * filtered data for events (interrupts), different interrupt sources are * used for different chips and the relevant registers are included here. */ struct mma8452_event_regs { u8 ev_cfg; u8 ev_cfg_ele; u8 ev_cfg_chan_shift; u8 ev_src; u8 ev_ths; u8 ev_ths_mask; u8 ev_count; }; static const struct mma8452_event_regs ff_mt_ev_regs = { .ev_cfg = MMA8452_FF_MT_CFG, .ev_cfg_ele = MMA8452_FF_MT_CFG_ELE, .ev_cfg_chan_shift = MMA8452_FF_MT_CHAN_SHIFT, .ev_src = MMA8452_FF_MT_SRC, .ev_ths = MMA8452_FF_MT_THS, .ev_ths_mask = MMA8452_FF_MT_THS_MASK, .ev_count = MMA8452_FF_MT_COUNT }; static const struct mma8452_event_regs trans_ev_regs = { .ev_cfg = MMA8452_TRANSIENT_CFG, .ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE, .ev_cfg_chan_shift = MMA8452_TRANSIENT_CHAN_SHIFT, .ev_src = MMA8452_TRANSIENT_SRC, .ev_ths = MMA8452_TRANSIENT_THS, .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK, .ev_count = MMA8452_TRANSIENT_COUNT, }; /** * struct mma_chip_info - chip specific data * @chip_id: WHO_AM_I register's value * @channels: struct iio_chan_spec matching the device's * capabilities * @num_channels: number of channels * @mma_scales: scale factors for converting register values * to m/s^2; 3 modes: 2g, 4g, 8g; 2 integers * per mode: m/s^2 and micro m/s^2 * @all_events: all events supported by this chip * @enabled_events: event flags enabled and handled by this driver */ struct mma_chip_info { u8 chip_id; const struct iio_chan_spec *channels; int num_channels; const int mma_scales[3][2]; int all_events; int enabled_events; }; enum { idx_x, idx_y, idx_z, idx_ts, }; static int mma8452_drdy(struct mma8452_data *data) { int tries = 150; while (tries-- > 0) { int ret = i2c_smbus_read_byte_data(data->client, MMA8452_STATUS); if (ret < 0) return ret; if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY) return 0; if (data->sleep_val <= 20) usleep_range(data->sleep_val * 250, data->sleep_val * 500); else msleep(20); } dev_err(&data->client->dev, "data not ready\n"); return -EIO; } static int mma8452_set_runtime_pm_state(struct i2c_client *client, bool on) { #ifdef CONFIG_PM int ret; if (on) { ret = pm_runtime_get_sync(&client->dev); } else { pm_runtime_mark_last_busy(&client->dev); ret = pm_runtime_put_autosuspend(&client->dev); } if (ret < 0) { dev_err(&client->dev, "failed to change power state to %d\n", on); if (on) pm_runtime_put_noidle(&client->dev); return ret; } #endif return 0; } static int mma8452_read(struct mma8452_data *data, __be16 buf[3]) { int ret = mma8452_drdy(data); if (ret < 0) return ret; ret = mma8452_set_runtime_pm_state(data->client, true); if (ret) return ret; ret = i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X, 3 * sizeof(__be16), (u8 *)buf); ret = mma8452_set_runtime_pm_state(data->client, false); return ret; } static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2], int n) { size_t len = 0; while (n-- > 0) len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", vals[n][0], vals[n][1]); /* replace trailing space by newline */ buf[len - 1] = '\n'; return len; } static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n, int val, int val2) { while (n-- > 0) if (val == vals[n][0] && val2 == vals[n][1]) return n; return -EINVAL; } static unsigned int mma8452_get_odr_index(struct mma8452_data *data) { return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >> MMA8452_CTRL_DR_SHIFT; } static const int mma8452_samp_freq[8][2] = { {800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000}, {6, 250000}, {1, 560000} }; /* Datasheet table: step time "Relationship with the ODR" (sample frequency) */ static const unsigned int mma8452_time_step_us[4][8] = { { 1250, 2500, 5000, 10000, 20000, 20000, 20000, 20000 }, /* normal */ { 1250, 2500, 5000, 10000, 20000, 80000, 80000, 80000 }, /* l p l n */ { 1250, 2500, 2500, 2500, 2500, 2500, 2500, 2500 }, /* high res*/ { 1250, 2500, 5000, 10000, 20000, 80000, 160000, 160000 } /* l p */ }; /* Datasheet table "High-Pass Filter Cutoff Options" */ static const int mma8452_hp_filter_cutoff[4][8][4][2] = { { /* normal */ { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */ { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */ { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */ { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */ { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */ { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */ { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */ { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */ }, { /* low noise low power */ { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }, { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }, { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} } }, { /* high resolution */ { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {16, 0}, {8, 0}, {4, 0}, {2, 0} } }, { /* low power */ { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, { {1, 0}, {0, 500000}, {0, 250000}, {0, 125000} }, { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }, { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }, { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} } } }; /* Datasheet table "MODS Oversampling modes averaging values at each ODR" */ static const u16 mma8452_os_ratio[4][8] = { /* 800 Hz, 400 Hz, ... , 1.56 Hz */ { 2, 4, 4, 4, 4, 16, 32, 128 }, /* normal */ { 2, 4, 4, 4, 4, 4, 8, 32 }, /* low power low noise */ { 2, 4, 8, 16, 32, 128, 256, 1024 }, /* high resolution */ { 2, 2, 2, 2, 2, 2, 4, 16 } /* low power */ }; static int mma8452_get_power_mode(struct mma8452_data *data) { int reg; reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG2); if (reg < 0) return reg; return ((reg & MMA8452_CTRL_REG2_MODS_MASK) >> MMA8452_CTRL_REG2_MODS_SHIFT); } static ssize_t mma8452_show_samp_freq_avail(struct device *dev, struct device_attribute *attr, char *buf) { return mma8452_show_int_plus_micros(buf, mma8452_samp_freq, ARRAY_SIZE(mma8452_samp_freq)); } static ssize_t mma8452_show_scale_avail(struct device *dev, struct device_attribute *attr, char *buf) { struct mma8452_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales, ARRAY_SIZE(data->chip_info->mma_scales)); } static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mma8452_data *data = iio_priv(indio_dev); int i, j; i = mma8452_get_odr_index(data); j = mma8452_get_power_mode(data); if (j < 0) return j; return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[j][i], ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0])); } static ssize_t mma8452_show_os_ratio_avail(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mma8452_data *data = iio_priv(indio_dev); int i = mma8452_get_odr_index(data); int j; u16 val = 0; size_t len = 0; for (j = 0; j < ARRAY_SIZE(mma8452_os_ratio); j++) { if (val == mma8452_os_ratio[j][i]) continue; val = mma8452_os_ratio[j][i]; len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", val); } buf[len - 1] = '\n'; return len; } static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail); static IIO_DEVICE_ATTR(in_accel_scale_available, 0444, mma8452_show_scale_avail, NULL, 0); static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available, 0444, mma8452_show_hp_cutoff_avail, NULL, 0); static IIO_DEVICE_ATTR(in_accel_oversampling_ratio_available, 0444, mma8452_show_os_ratio_avail, NULL, 0); static int mma8452_get_samp_freq_index(struct mma8452_data *data, int val, int val2) { return mma8452_get_int_plus_micros_index(mma8452_samp_freq, ARRAY_SIZE(mma8452_samp_freq), val, val2); } static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2) { return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales, ARRAY_SIZE(data->chip_info->mma_scales), val, val2); } static int mma8452_get_hp_filter_index(struct mma8452_data *data, int val, int val2) { int i, j; i = mma8452_get_odr_index(data); j = mma8452_get_power_mode(data); if (j < 0) return j; return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[j][i], ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]), val, val2); } static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz) { int j, i, ret; ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF); if (ret < 0) return ret; i = mma8452_get_odr_index(data); j = mma8452_get_power_mode(data); if (j < 0) return j; ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK; *hz = mma8452_hp_filter_cutoff[j][i][ret][0]; *uHz = mma8452_hp_filter_cutoff[j][i][ret][1]; return 0; } static int mma8452_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct mma8452_data *data = iio_priv(indio_dev); __be16 buffer[3]; int i, ret; switch (mask) { case IIO_CHAN_INFO_RAW: ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; mutex_lock(&data->lock); ret = mma8452_read(data, buffer); mutex_unlock(&data->lock); iio_device_release_direct_mode(indio_dev); if (ret < 0) return ret; *val = sign_extend32(be16_to_cpu( buffer[chan->scan_index]) >> chan->scan_type.shift, chan->scan_type.realbits - 1); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK; *val = data->chip_info->mma_scales[i][0]; *val2 = data->chip_info->mma_scales[i][1]; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_SAMP_FREQ: i = mma8452_get_odr_index(data); *val = mma8452_samp_freq[i][0]; *val2 = mma8452_samp_freq[i][1]; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_CALIBBIAS: ret = i2c_smbus_read_byte_data(data->client, MMA8452_OFF_X + chan->scan_index); if (ret < 0) return ret; *val = sign_extend32(ret, 7); return IIO_VAL_INT; case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY: if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) { ret = mma8452_read_hp_filter(data, val, val2); if (ret < 0) return ret; } else { *val = 0; *val2 = 0; } return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: ret = mma8452_get_power_mode(data); if (ret < 0) return ret; i = mma8452_get_odr_index(data); *val = mma8452_os_ratio[ret][i]; return IIO_VAL_INT; } return -EINVAL; } static int mma8452_calculate_sleep(struct mma8452_data *data) { int ret, i = mma8452_get_odr_index(data); if (mma8452_samp_freq[i][0] > 0) ret = 1000 / mma8452_samp_freq[i][0]; else ret = 1000; return ret == 0 ? 1 : ret; } static int mma8452_standby(struct mma8452_data *data) { return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1, data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE); } static int mma8452_active(struct mma8452_data *data) { return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1, data->ctrl_reg1); } /* returns >0 if active, 0 if in standby and <0 on error */ static int mma8452_is_active(struct mma8452_data *data) { int reg; reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG1); if (reg < 0) return reg; return reg & MMA8452_CTRL_ACTIVE; } static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val) { int ret; int is_active; mutex_lock(&data->lock); is_active = mma8452_is_active(data); if (is_active < 0) { ret = is_active; goto fail; } /* config can only be changed when in standby */ if (is_active > 0) { ret = mma8452_standby(data); if (ret < 0) goto fail; } ret = i2c_smbus_write_byte_data(data->client, reg, val); if (ret < 0) goto fail; if (is_active > 0) { ret = mma8452_active(data); if (ret < 0) goto fail; } ret = 0; fail: mutex_unlock(&data->lock); return ret; } static int mma8452_set_power_mode(struct mma8452_data *data, u8 mode) { int reg; reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG2); if (reg < 0) return reg; reg &= ~MMA8452_CTRL_REG2_MODS_MASK; reg |= mode << MMA8452_CTRL_REG2_MODS_SHIFT; return mma8452_change_config(data, MMA8452_CTRL_REG2, reg); } /* returns >0 if in freefall mode, 0 if not or <0 if an error occurred */ static int mma8452_freefall_mode_enabled(struct mma8452_data *data) { int val; val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG); if (val < 0) return val; return !(val & MMA8452_FF_MT_CFG_OAE); } static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state) { int val; if ((state && mma8452_freefall_mode_enabled(data)) || (!state && !(mma8452_freefall_mode_enabled(data)))) return 0; val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG); if (val < 0) return val; if (state) { val |= BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT); val |= BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT); val |= BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT); val &= ~MMA8452_FF_MT_CFG_OAE; } else { val &= ~BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT); val &= ~BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT); val &= ~BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT); val |= MMA8452_FF_MT_CFG_OAE; } return mma8452_change_config(data, MMA8452_FF_MT_CFG, val); } static int mma8452_set_hp_filter_frequency(struct mma8452_data *data, int val, int val2) { int i, reg; i = mma8452_get_hp_filter_index(data, val, val2); if (i < 0) return i; reg = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF); if (reg < 0) return reg; reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK; reg |= i; return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg); } static int mma8452_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct mma8452_data *data = iio_priv(indio_dev); int i, ret; ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: i = mma8452_get_samp_freq_index(data, val, val2); if (i < 0) { ret = i; break; } data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK; data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT; data->sleep_val = mma8452_calculate_sleep(data); ret = mma8452_change_config(data, MMA8452_CTRL_REG1, data->ctrl_reg1); break; case IIO_CHAN_INFO_SCALE: i = mma8452_get_scale_index(data, val, val2); if (i < 0) { ret = i; break; } data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK; data->data_cfg |= i; ret = mma8452_change_config(data, MMA8452_DATA_CFG, data->data_cfg); break; case IIO_CHAN_INFO_CALIBBIAS: if (val < -128 || val > 127) { ret = -EINVAL; break; } ret = mma8452_change_config(data, MMA8452_OFF_X + chan->scan_index, val); break; case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY: if (val == 0 && val2 == 0) { data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK; } else { data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK; ret = mma8452_set_hp_filter_frequency(data, val, val2); if (ret < 0) break; } ret = mma8452_change_config(data, MMA8452_DATA_CFG, data->data_cfg); break; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: ret = mma8452_get_odr_index(data); for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) { if (mma8452_os_ratio[i][ret] == val) { ret = mma8452_set_power_mode(data, i); break; } } break; default: ret = -EINVAL; break; } iio_device_release_direct_mode(indio_dev); return ret; } static int mma8452_get_event_regs(struct mma8452_data *data, const struct iio_chan_spec *chan, enum iio_event_direction dir, const struct mma8452_event_regs **ev_reg) { if (!chan) return -EINVAL; switch (chan->type) { case IIO_ACCEL: switch (dir) { case IIO_EV_DIR_RISING: if ((data->chip_info->all_events & MMA8452_INT_TRANS) && (data->chip_info->enabled_events & MMA8452_INT_TRANS)) *ev_reg = &trans_ev_regs; else *ev_reg = &ff_mt_ev_regs; return 0; case IIO_EV_DIR_FALLING: *ev_reg = &ff_mt_ev_regs; return 0; default: return -EINVAL; } default: return -EINVAL; } } static int mma8452_read_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { struct mma8452_data *data = iio_priv(indio_dev); int ret, us, power_mode; const struct mma8452_event_regs *ev_regs; ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); if (ret) return ret; switch (info) { case IIO_EV_INFO_VALUE: ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_ths); if (ret < 0) return ret; *val = ret & ev_regs->ev_ths_mask; return IIO_VAL_INT; case IIO_EV_INFO_PERIOD: ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_count); if (ret < 0) return ret; power_mode = mma8452_get_power_mode(data); if (power_mode < 0) return power_mode; us = ret * mma8452_time_step_us[power_mode][ mma8452_get_odr_index(data)]; *val = us / USEC_PER_SEC; *val2 = us % USEC_PER_SEC; return IIO_VAL_INT_PLUS_MICRO; case IIO_EV_INFO_HIGH_PASS_FILTER_3DB: ret = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG); if (ret < 0) return ret; if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) { *val = 0; *val2 = 0; } else { ret = mma8452_read_hp_filter(data, val, val2); if (ret < 0) return ret; } return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } } static int mma8452_write_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { struct mma8452_data *data = iio_priv(indio_dev); int ret, reg, steps; const struct mma8452_event_regs *ev_regs; ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); if (ret) return ret; switch (info) { case IIO_EV_INFO_VALUE: if (val < 0 || val > ev_regs->ev_ths_mask) return -EINVAL; return mma8452_change_config(data, ev_regs->ev_ths, val); case IIO_EV_INFO_PERIOD: ret = mma8452_get_power_mode(data); if (ret < 0) return ret; steps = (val * USEC_PER_SEC + val2) / mma8452_time_step_us[ret][ mma8452_get_odr_index(data)]; if (steps < 0 || steps > 0xff) return -EINVAL; return mma8452_change_config(data, ev_regs->ev_count, steps); case IIO_EV_INFO_HIGH_PASS_FILTER_3DB: reg = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG); if (reg < 0) return reg; if (val == 0 && val2 == 0) { reg |= MMA8452_TRANSIENT_CFG_HPF_BYP; } else { reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP; ret = mma8452_set_hp_filter_frequency(data, val, val2); if (ret < 0) return ret; } return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg); default: return -EINVAL; } } static int mma8452_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { struct mma8452_data *data = iio_priv(indio_dev); int ret; const struct mma8452_event_regs *ev_regs; ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); if (ret) return ret; switch (dir) { case IIO_EV_DIR_FALLING: return mma8452_freefall_mode_enabled(data); case IIO_EV_DIR_RISING: ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_cfg); if (ret < 0) return ret; return !!(ret & BIT(chan->scan_index + ev_regs->ev_cfg_chan_shift)); default: return -EINVAL; } } static int mma8452_write_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, int state) { struct mma8452_data *data = iio_priv(indio_dev); int val, ret; const struct mma8452_event_regs *ev_regs; ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); if (ret) return ret; ret = mma8452_set_runtime_pm_state(data->client, state); if (ret) return ret; switch (dir) { case IIO_EV_DIR_FALLING: return mma8452_set_freefall_mode(data, state); case IIO_EV_DIR_RISING: val = i2c_smbus_read_byte_data(data->client, ev_regs->ev_cfg); if (val < 0) return val; if (state) { if (mma8452_freefall_mode_enabled(data)) { val &= ~BIT(idx_x + ev_regs->ev_cfg_chan_shift); val &= ~BIT(idx_y + ev_regs->ev_cfg_chan_shift); val &= ~BIT(idx_z + ev_regs->ev_cfg_chan_shift); val |= MMA8452_FF_MT_CFG_OAE; } val |= BIT(chan->scan_index + ev_regs->ev_cfg_chan_shift); } else { if (mma8452_freefall_mode_enabled(data)) return 0; val &= ~BIT(chan->scan_index + ev_regs->ev_cfg_chan_shift); } val |= ev_regs->ev_cfg_ele; return mma8452_change_config(data, ev_regs->ev_cfg, val); default: return -EINVAL; } } static void mma8452_transient_interrupt(struct iio_dev *indio_dev) { struct mma8452_data *data = iio_priv(indio_dev); s64 ts = iio_get_time_ns(indio_dev); int src; src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC); if (src < 0) return; if (src & MMA8452_TRANSIENT_SRC_XTRANSE) iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X, IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts); if (src & MMA8452_TRANSIENT_SRC_YTRANSE) iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y, IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts); if (src & MMA8452_TRANSIENT_SRC_ZTRANSE) iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z, IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING), ts); } static irqreturn_t mma8452_interrupt(int irq, void *p) { struct iio_dev *indio_dev = p; struct mma8452_data *data = iio_priv(indio_dev); int ret = IRQ_NONE; int src; src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC); if (src < 0) return IRQ_NONE; if (!(src & (data->chip_info->enabled_events | MMA8452_INT_DRDY))) return IRQ_NONE; if (src & MMA8452_INT_DRDY) { iio_trigger_poll_chained(indio_dev->trig); ret = IRQ_HANDLED; } if (src & MMA8452_INT_FF_MT) { if (mma8452_freefall_mode_enabled(data)) { s64 ts = iio_get_time_ns(indio_dev); iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X_AND_Y_AND_Z, IIO_EV_TYPE_MAG, IIO_EV_DIR_FALLING), ts); } ret = IRQ_HANDLED; } if (src & MMA8452_INT_TRANS) { mma8452_transient_interrupt(indio_dev); ret = IRQ_HANDLED; } return ret; } static irqreturn_t mma8452_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct mma8452_data *data = iio_priv(indio_dev); u8 buffer[16]; /* 3 16-bit channels + padding + ts */ int ret; ret = mma8452_read(data, (__be16 *)buffer); if (ret < 0) goto done; iio_push_to_buffers_with_timestamp(indio_dev, buffer, iio_get_time_ns(indio_dev)); done: iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } static int mma8452_reg_access_dbg(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { int ret; struct mma8452_data *data = iio_priv(indio_dev); if (reg > MMA8452_MAX_REG) return -EINVAL; if (!readval) return mma8452_change_config(data, reg, writeval); ret = i2c_smbus_read_byte_data(data->client, reg); if (ret < 0) return ret; *readval = ret; return 0; } static const struct iio_event_spec mma8452_freefall_event[] = { { .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB) }, }; static const struct iio_event_spec mma8652_freefall_event[] = { { .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_PERIOD) }, }; static const struct iio_event_spec mma8452_transient_event[] = { { .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB) }, }; static const struct iio_event_spec mma8452_motion_event[] = { { .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_RISING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_PERIOD) }, }; /* * Threshold is configured in fixed 8G/127 steps regardless of * currently selected scale for measurement. */ static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742"); static struct attribute *mma8452_event_attributes[] = { &iio_const_attr_accel_transient_scale.dev_attr.attr, NULL, }; static struct attribute_group mma8452_event_attribute_group = { .attrs = mma8452_event_attributes, }; #define MMA8452_FREEFALL_CHANNEL(modifier) { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = modifier, \ .scan_index = -1, \ .event_spec = mma8452_freefall_event, \ .num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \ } #define MMA8652_FREEFALL_CHANNEL(modifier) { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = modifier, \ .scan_index = -1, \ .event_spec = mma8652_freefall_event, \ .num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \ } #define MMA8452_CHANNEL(axis, idx, bits) { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_CALIBBIAS), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY) | \ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ .scan_index = idx, \ .scan_type = { \ .sign = 's', \ .realbits = (bits), \ .storagebits = 16, \ .shift = 16 - (bits), \ .endianness = IIO_BE, \ }, \ .event_spec = mma8452_transient_event, \ .num_event_specs = ARRAY_SIZE(mma8452_transient_event), \ } #define MMA8652_CHANNEL(axis, idx, bits) { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_CALIBBIAS), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ .scan_index = idx, \ .scan_type = { \ .sign = 's', \ .realbits = (bits), \ .storagebits = 16, \ .shift = 16 - (bits), \ .endianness = IIO_BE, \ }, \ .event_spec = mma8452_motion_event, \ .num_event_specs = ARRAY_SIZE(mma8452_motion_event), \ } static const struct iio_chan_spec mma8451_channels[] = { MMA8452_CHANNEL(X, idx_x, 14), MMA8452_CHANNEL(Y, idx_y, 14), MMA8452_CHANNEL(Z, idx_z, 14), IIO_CHAN_SOFT_TIMESTAMP(idx_ts), MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), }; static const struct iio_chan_spec mma8452_channels[] = { MMA8452_CHANNEL(X, idx_x, 12), MMA8452_CHANNEL(Y, idx_y, 12), MMA8452_CHANNEL(Z, idx_z, 12), IIO_CHAN_SOFT_TIMESTAMP(idx_ts), MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), }; static const struct iio_chan_spec mma8453_channels[] = { MMA8452_CHANNEL(X, idx_x, 10), MMA8452_CHANNEL(Y, idx_y, 10), MMA8452_CHANNEL(Z, idx_z, 10), IIO_CHAN_SOFT_TIMESTAMP(idx_ts), MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), }; static const struct iio_chan_spec mma8652_channels[] = { MMA8652_CHANNEL(X, idx_x, 12), MMA8652_CHANNEL(Y, idx_y, 12), MMA8652_CHANNEL(Z, idx_z, 12), IIO_CHAN_SOFT_TIMESTAMP(idx_ts), MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), }; static const struct iio_chan_spec mma8653_channels[] = { MMA8652_CHANNEL(X, idx_x, 10), MMA8652_CHANNEL(Y, idx_y, 10), MMA8652_CHANNEL(Z, idx_z, 10), IIO_CHAN_SOFT_TIMESTAMP(idx_ts), MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), }; enum { mma8451, mma8452, mma8453, mma8652, mma8653, fxls8471, }; static const struct mma_chip_info mma_chip_info_table[] = { [mma8451] = { .chip_id = MMA8451_DEVICE_ID, .channels = mma8451_channels, .num_channels = ARRAY_SIZE(mma8451_channels), /* * Hardware has fullscale of -2G, -4G, -8G corresponding to * raw value -8192 for 14 bit, -2048 for 12 bit or -512 for 10 * bit. * The userspace interface uses m/s^2 and we declare micro units * So scale factor for 12 bit here is given by: * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665 */ .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} }, /* * Although we enable the interrupt sources once and for * all here the event detection itself is not enabled until * userspace asks for it by mma8452_write_event_config() */ .all_events = MMA8452_INT_DRDY | MMA8452_INT_TRANS | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_TRANS | MMA8452_INT_FF_MT, }, [mma8452] = { .chip_id = MMA8452_DEVICE_ID, .channels = mma8452_channels, .num_channels = ARRAY_SIZE(mma8452_channels), .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} }, /* * Although we enable the interrupt sources once and for * all here the event detection itself is not enabled until * userspace asks for it by mma8452_write_event_config() */ .all_events = MMA8452_INT_DRDY | MMA8452_INT_TRANS | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_TRANS | MMA8452_INT_FF_MT, }, [mma8453] = { .chip_id = MMA8453_DEVICE_ID, .channels = mma8453_channels, .num_channels = ARRAY_SIZE(mma8453_channels), .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} }, /* * Although we enable the interrupt sources once and for * all here the event detection itself is not enabled until * userspace asks for it by mma8452_write_event_config() */ .all_events = MMA8452_INT_DRDY | MMA8452_INT_TRANS | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_TRANS | MMA8452_INT_FF_MT, }, [mma8652] = { .chip_id = MMA8652_DEVICE_ID, .channels = mma8652_channels, .num_channels = ARRAY_SIZE(mma8652_channels), .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} }, .all_events = MMA8452_INT_DRDY | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_FF_MT, }, [mma8653] = { .chip_id = MMA8653_DEVICE_ID, .channels = mma8653_channels, .num_channels = ARRAY_SIZE(mma8653_channels), .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} }, /* * Although we enable the interrupt sources once and for * all here the event detection itself is not enabled until * userspace asks for it by mma8452_write_event_config() */ .all_events = MMA8452_INT_DRDY | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_FF_MT, }, [fxls8471] = { .chip_id = FXLS8471_DEVICE_ID, .channels = mma8451_channels, .num_channels = ARRAY_SIZE(mma8451_channels), .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} }, /* * Although we enable the interrupt sources once and for * all here the event detection itself is not enabled until * userspace asks for it by mma8452_write_event_config() */ .all_events = MMA8452_INT_DRDY | MMA8452_INT_TRANS | MMA8452_INT_FF_MT, .enabled_events = MMA8452_INT_TRANS | MMA8452_INT_FF_MT, }, }; static struct attribute *mma8452_attributes[] = { &iio_dev_attr_sampling_frequency_available.dev_attr.attr, &iio_dev_attr_in_accel_scale_available.dev_attr.attr, &iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr, &iio_dev_attr_in_accel_oversampling_ratio_available.dev_attr.attr, NULL }; static const struct attribute_group mma8452_group = { .attrs = mma8452_attributes, }; static const struct iio_info mma8452_info = { .attrs = &mma8452_group, .read_raw = &mma8452_read_raw, .write_raw = &mma8452_write_raw, .event_attrs = &mma8452_event_attribute_group, .read_event_value = &mma8452_read_event_value, .write_event_value = &mma8452_write_event_value, .read_event_config = &mma8452_read_event_config, .write_event_config = &mma8452_write_event_config, .debugfs_reg_access = &mma8452_reg_access_dbg, }; static const unsigned long mma8452_scan_masks[] = {0x7, 0}; static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) { struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); struct mma8452_data *data = iio_priv(indio_dev); int reg, ret; ret = mma8452_set_runtime_pm_state(data->client, state); if (ret) return ret; reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4); if (reg < 0) return reg; if (state) reg |= MMA8452_INT_DRDY; else reg &= ~MMA8452_INT_DRDY; return mma8452_change_config(data, MMA8452_CTRL_REG4, reg); } static const struct iio_trigger_ops mma8452_trigger_ops = { .set_trigger_state = mma8452_data_rdy_trigger_set_state, .validate_device = iio_trigger_validate_own_device, }; static int mma8452_trigger_setup(struct iio_dev *indio_dev) { struct mma8452_data *data = iio_priv(indio_dev); struct iio_trigger *trig; int ret; trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d", indio_dev->name, indio_dev->id); if (!trig) return -ENOMEM; trig->dev.parent = &data->client->dev; trig->ops = &mma8452_trigger_ops; iio_trigger_set_drvdata(trig, indio_dev); ret = iio_trigger_register(trig); if (ret) return ret; indio_dev->trig = trig; return 0; } static void mma8452_trigger_cleanup(struct iio_dev *indio_dev) { if (indio_dev->trig) iio_trigger_unregister(indio_dev->trig); } static int mma8452_reset(struct i2c_client *client) { int i; int ret; ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2, MMA8452_CTRL_REG2_RST); if (ret < 0) return ret; for (i = 0; i < 10; i++) { usleep_range(100, 200); ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2); if (ret == -EIO) continue; /* I2C comm reset */ if (ret < 0) return ret; if (!(ret & MMA8452_CTRL_REG2_RST)) return 0; } return -ETIMEDOUT; } static const struct of_device_id mma8452_dt_ids[] = { { .compatible = "fsl,mma8451", .data = &mma_chip_info_table[mma8451] }, { .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] }, { .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] }, { .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] }, { .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] }, { .compatible = "fsl,fxls8471", .data = &mma_chip_info_table[fxls8471] }, { } }; MODULE_DEVICE_TABLE(of, mma8452_dt_ids); static int mma8452_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mma8452_data *data; struct iio_dev *indio_dev; int ret; const struct of_device_id *match; match = of_match_device(mma8452_dt_ids, &client->dev); if (!match) { dev_err(&client->dev, "unknown device model\n"); return -ENODEV; } indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; data = iio_priv(indio_dev); data->client = client; mutex_init(&data->lock); data->chip_info = match->data; ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I); if (ret < 0) return ret; switch (ret) { case MMA8451_DEVICE_ID: case MMA8452_DEVICE_ID: case MMA8453_DEVICE_ID: case MMA8652_DEVICE_ID: case MMA8653_DEVICE_ID: case FXLS8471_DEVICE_ID: if (ret == data->chip_info->chip_id) break; /* else: fall through */ default: return -ENODEV; } dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n", match->compatible, data->chip_info->chip_id); i2c_set_clientdata(client, indio_dev); indio_dev->info = &mma8452_info; indio_dev->name = id->name; indio_dev->dev.parent = &client->dev; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = data->chip_info->channels; indio_dev->num_channels = data->chip_info->num_channels; indio_dev->available_scan_masks = mma8452_scan_masks; ret = mma8452_reset(client); if (ret < 0) return ret; data->data_cfg = MMA8452_DATA_CFG_FS_2G; ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG, data->data_cfg); if (ret < 0) return ret; /* * By default set transient threshold to max to avoid events if * enabling without configuring threshold. */ ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS, MMA8452_TRANSIENT_THS_MASK); if (ret < 0) return ret; if (client->irq) { int irq2; irq2 = of_irq_get_byname(client->dev.of_node, "INT2"); if (irq2 == client->irq) { dev_dbg(&client->dev, "using interrupt line INT2\n"); } else { ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG5, data->chip_info->all_events); if (ret < 0) return ret; dev_dbg(&client->dev, "using interrupt line INT1\n"); } ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG4, data->chip_info->enabled_events); if (ret < 0) return ret; ret = mma8452_trigger_setup(indio_dev); if (ret < 0) return ret; } data->ctrl_reg1 = MMA8452_CTRL_ACTIVE | (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT); data->sleep_val = mma8452_calculate_sleep(data); ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1, data->ctrl_reg1); if (ret < 0) goto trigger_cleanup; ret = iio_triggered_buffer_setup(indio_dev, NULL, mma8452_trigger_handler, NULL); if (ret < 0) goto trigger_cleanup; if (client->irq) { ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, mma8452_interrupt, IRQF_TRIGGER_LOW | IRQF_ONESHOT, client->name, indio_dev); if (ret) goto buffer_cleanup; } ret = pm_runtime_set_active(&client->dev); if (ret < 0) goto buffer_cleanup; pm_runtime_enable(&client->dev); pm_runtime_set_autosuspend_delay(&client->dev, MMA8452_AUTO_SUSPEND_DELAY_MS); pm_runtime_use_autosuspend(&client->dev); ret = iio_device_register(indio_dev); if (ret < 0) goto buffer_cleanup; ret = mma8452_set_freefall_mode(data, false); if (ret < 0) goto buffer_cleanup; return 0; buffer_cleanup: iio_triggered_buffer_cleanup(indio_dev); trigger_cleanup: mma8452_trigger_cleanup(indio_dev); return ret; } static int mma8452_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); pm_runtime_put_noidle(&client->dev); iio_triggered_buffer_cleanup(indio_dev); mma8452_trigger_cleanup(indio_dev); mma8452_standby(iio_priv(indio_dev)); return 0; } #ifdef CONFIG_PM static int mma8452_runtime_suspend(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct mma8452_data *data = iio_priv(indio_dev); int ret; mutex_lock(&data->lock); ret = mma8452_standby(data); mutex_unlock(&data->lock); if (ret < 0) { dev_err(&data->client->dev, "powering off device failed\n"); return -EAGAIN; } return 0; } static int mma8452_runtime_resume(struct device *dev) { struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); struct mma8452_data *data = iio_priv(indio_dev); int ret, sleep_val; ret = mma8452_active(data); if (ret < 0) return ret; ret = mma8452_get_odr_index(data); sleep_val = 1000 / mma8452_samp_freq[ret][0]; if (sleep_val < 20) usleep_range(sleep_val * 1000, 20000); else msleep_interruptible(sleep_val); return 0; } #endif #ifdef CONFIG_PM_SLEEP static int mma8452_suspend(struct device *dev) { return mma8452_standby(iio_priv(i2c_get_clientdata( to_i2c_client(dev)))); } static int mma8452_resume(struct device *dev) { return mma8452_active(iio_priv(i2c_get_clientdata( to_i2c_client(dev)))); } #endif static const struct dev_pm_ops mma8452_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(mma8452_suspend, mma8452_resume) SET_RUNTIME_PM_OPS(mma8452_runtime_suspend, mma8452_runtime_resume, NULL) }; static const struct i2c_device_id mma8452_id[] = { { "mma8451", mma8451 }, { "mma8452", mma8452 }, { "mma8453", mma8453 }, { "mma8652", mma8652 }, { "mma8653", mma8653 }, { "fxls8471", fxls8471 }, { } }; MODULE_DEVICE_TABLE(i2c, mma8452_id); static struct i2c_driver mma8452_driver = { .driver = { .name = "mma8452", .of_match_table = of_match_ptr(mma8452_dt_ids), .pm = &mma8452_pm_ops, }, .probe = mma8452_probe, .remove = mma8452_remove, .id_table = mma8452_id, }; module_i2c_driver(mma8452_driver); MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); MODULE_DESCRIPTION("Freescale / NXP MMA8452 accelerometer driver"); MODULE_LICENSE("GPL");
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