| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Crestez Dan Leonard | 1712 | 99.59% | 1 | 50.00% |
| Javier Martinez Canillas | 7 | 0.41% | 1 | 50.00% |
| Total | 1719 | 2 |
/* * hp206c.c - HOPERF HP206C precision barometer and altimeter sensor * * Copyright (c) 2016, Intel Corporation. * * This file is subject to the terms and conditions of version 2 of * the GNU General Public License. See the file COPYING in the main * directory of this archive for more details. * * (7-bit I2C slave address 0x76) * * Datasheet: * http://www.hoperf.com/upload/sensor/HP206C_DataSheet_EN_V2.0.pdf */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/delay.h> #include <linux/util_macros.h> #include <linux/acpi.h> /* I2C commands: */ #define HP206C_CMD_SOFT_RST 0x06 #define HP206C_CMD_ADC_CVT 0x40 #define HP206C_CMD_ADC_CVT_OSR_4096 0x00 #define HP206C_CMD_ADC_CVT_OSR_2048 0x04 #define HP206C_CMD_ADC_CVT_OSR_1024 0x08 #define HP206C_CMD_ADC_CVT_OSR_512 0x0c #define HP206C_CMD_ADC_CVT_OSR_256 0x10 #define HP206C_CMD_ADC_CVT_OSR_128 0x14 #define HP206C_CMD_ADC_CVT_CHNL_PT 0x00 #define HP206C_CMD_ADC_CVT_CHNL_T 0x02 #define HP206C_CMD_READ_P 0x30 #define HP206C_CMD_READ_T 0x32 #define HP206C_CMD_READ_REG 0x80 #define HP206C_CMD_WRITE_REG 0xc0 #define HP206C_REG_INT_EN 0x0b #define HP206C_REG_INT_CFG 0x0c #define HP206C_REG_INT_SRC 0x0d #define HP206C_FLAG_DEV_RDY 0x40 #define HP206C_REG_PARA 0x0f #define HP206C_FLAG_CMPS_EN 0x80 /* Maximum spin for DEV_RDY */ #define HP206C_MAX_DEV_RDY_WAIT_COUNT 20 #define HP206C_DEV_RDY_WAIT_US 20000 struct hp206c_data { struct mutex mutex; struct i2c_client *client; int temp_osr_index; int pres_osr_index; }; struct hp206c_osr_setting { u8 osr_mask; unsigned int temp_conv_time_us; unsigned int pres_conv_time_us; }; /* Data from Table 5 in datasheet. */ static const struct hp206c_osr_setting hp206c_osr_settings[] = { { HP206C_CMD_ADC_CVT_OSR_4096, 65600, 131100 }, { HP206C_CMD_ADC_CVT_OSR_2048, 32800, 65600 }, { HP206C_CMD_ADC_CVT_OSR_1024, 16400, 32800 }, { HP206C_CMD_ADC_CVT_OSR_512, 8200, 16400 }, { HP206C_CMD_ADC_CVT_OSR_256, 4100, 8200 }, { HP206C_CMD_ADC_CVT_OSR_128, 2100, 4100 }, }; static const int hp206c_osr_rates[] = { 4096, 2048, 1024, 512, 256, 128 }; static const char hp206c_osr_rates_str[] = "4096 2048 1024 512 256 128"; static inline int hp206c_read_reg(struct i2c_client *client, u8 reg) { return i2c_smbus_read_byte_data(client, HP206C_CMD_READ_REG | reg); } static inline int hp206c_write_reg(struct i2c_client *client, u8 reg, u8 val) { return i2c_smbus_write_byte_data(client, HP206C_CMD_WRITE_REG | reg, val); } static int hp206c_read_20bit(struct i2c_client *client, u8 cmd) { int ret; u8 values[3]; ret = i2c_smbus_read_i2c_block_data(client, cmd, 3, values); if (ret < 0) return ret; if (ret != 3) return -EIO; return ((values[0] & 0xF) << 16) | (values[1] << 8) | (values[2]); } /* Spin for max 160ms until DEV_RDY is 1, or return error. */ static int hp206c_wait_dev_rdy(struct iio_dev *indio_dev) { int ret; int count = 0; struct hp206c_data *data = iio_priv(indio_dev); struct i2c_client *client = data->client; while (++count <= HP206C_MAX_DEV_RDY_WAIT_COUNT) { ret = hp206c_read_reg(client, HP206C_REG_INT_SRC); if (ret < 0) { dev_err(&indio_dev->dev, "Failed READ_REG INT_SRC: %d\n", ret); return ret; } if (ret & HP206C_FLAG_DEV_RDY) return 0; usleep_range(HP206C_DEV_RDY_WAIT_US, HP206C_DEV_RDY_WAIT_US * 3 / 2); } return -ETIMEDOUT; } static int hp206c_set_compensation(struct i2c_client *client, bool enabled) { int val; val = hp206c_read_reg(client, HP206C_REG_PARA); if (val < 0) return val; if (enabled) val |= HP206C_FLAG_CMPS_EN; else val &= ~HP206C_FLAG_CMPS_EN; return hp206c_write_reg(client, HP206C_REG_PARA, val); } /* Do a soft reset */ static int hp206c_soft_reset(struct iio_dev *indio_dev) { int ret; struct hp206c_data *data = iio_priv(indio_dev); struct i2c_client *client = data->client; ret = i2c_smbus_write_byte(client, HP206C_CMD_SOFT_RST); if (ret) { dev_err(&client->dev, "Failed to reset device: %d\n", ret); return ret; } usleep_range(400, 600); ret = hp206c_wait_dev_rdy(indio_dev); if (ret) { dev_err(&client->dev, "Device not ready after soft reset: %d\n", ret); return ret; } ret = hp206c_set_compensation(client, true); if (ret) dev_err(&client->dev, "Failed to enable compensation: %d\n", ret); return ret; } static int hp206c_conv_and_read(struct iio_dev *indio_dev, u8 conv_cmd, u8 read_cmd, unsigned int sleep_us) { int ret; struct hp206c_data *data = iio_priv(indio_dev); struct i2c_client *client = data->client; ret = hp206c_wait_dev_rdy(indio_dev); if (ret < 0) { dev_err(&indio_dev->dev, "Device not ready: %d\n", ret); return ret; } ret = i2c_smbus_write_byte(client, conv_cmd); if (ret < 0) { dev_err(&indio_dev->dev, "Failed convert: %d\n", ret); return ret; } usleep_range(sleep_us, sleep_us * 3 / 2); ret = hp206c_wait_dev_rdy(indio_dev); if (ret < 0) { dev_err(&indio_dev->dev, "Device not ready: %d\n", ret); return ret; } ret = hp206c_read_20bit(client, read_cmd); if (ret < 0) dev_err(&indio_dev->dev, "Failed read: %d\n", ret); return ret; } static int hp206c_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { int ret; struct hp206c_data *data = iio_priv(indio_dev); const struct hp206c_osr_setting *osr_setting; u8 conv_cmd; mutex_lock(&data->mutex); switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: switch (chan->type) { case IIO_TEMP: *val = hp206c_osr_rates[data->temp_osr_index]; ret = IIO_VAL_INT; break; case IIO_PRESSURE: *val = hp206c_osr_rates[data->pres_osr_index]; ret = IIO_VAL_INT; break; default: ret = -EINVAL; } break; case IIO_CHAN_INFO_RAW: switch (chan->type) { case IIO_TEMP: osr_setting = &hp206c_osr_settings[data->temp_osr_index]; conv_cmd = HP206C_CMD_ADC_CVT | osr_setting->osr_mask | HP206C_CMD_ADC_CVT_CHNL_T; ret = hp206c_conv_and_read(indio_dev, conv_cmd, HP206C_CMD_READ_T, osr_setting->temp_conv_time_us); if (ret >= 0) { /* 20 significant bits are provided. * Extend sign over the rest. */ *val = sign_extend32(ret, 19); ret = IIO_VAL_INT; } break; case IIO_PRESSURE: osr_setting = &hp206c_osr_settings[data->pres_osr_index]; conv_cmd = HP206C_CMD_ADC_CVT | osr_setting->osr_mask | HP206C_CMD_ADC_CVT_CHNL_PT; ret = hp206c_conv_and_read(indio_dev, conv_cmd, HP206C_CMD_READ_P, osr_setting->pres_conv_time_us); if (ret >= 0) { *val = ret; ret = IIO_VAL_INT; } break; default: ret = -EINVAL; } break; case IIO_CHAN_INFO_SCALE: switch (chan->type) { case IIO_TEMP: *val = 0; *val2 = 10000; ret = IIO_VAL_INT_PLUS_MICRO; break; case IIO_PRESSURE: *val = 0; *val2 = 1000; ret = IIO_VAL_INT_PLUS_MICRO; break; default: ret = -EINVAL; } break; default: ret = -EINVAL; } mutex_unlock(&data->mutex); return ret; } static int hp206c_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { int ret = 0; struct hp206c_data *data = iio_priv(indio_dev); if (mask != IIO_CHAN_INFO_OVERSAMPLING_RATIO) return -EINVAL; mutex_lock(&data->mutex); switch (chan->type) { case IIO_TEMP: data->temp_osr_index = find_closest_descending(val, hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates)); break; case IIO_PRESSURE: data->pres_osr_index = find_closest_descending(val, hp206c_osr_rates, ARRAY_SIZE(hp206c_osr_rates)); break; default: ret = -EINVAL; } mutex_unlock(&data->mutex); return ret; } static const struct iio_chan_spec hp206c_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), }, { .type = IIO_PRESSURE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), } }; static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(hp206c_osr_rates_str); static struct attribute *hp206c_attributes[] = { &iio_const_attr_sampling_frequency_available.dev_attr.attr, NULL, }; static const struct attribute_group hp206c_attribute_group = { .attrs = hp206c_attributes, }; static const struct iio_info hp206c_info = { .attrs = &hp206c_attribute_group, .read_raw = hp206c_read_raw, .write_raw = hp206c_write_raw, }; static int hp206c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct iio_dev *indio_dev; struct hp206c_data *data; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { dev_err(&client->dev, "Adapter does not support " "all required i2c functionality\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->mutex); indio_dev->info = &hp206c_info; indio_dev->name = id->name; indio_dev->dev.parent = &client->dev; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = hp206c_channels; indio_dev->num_channels = ARRAY_SIZE(hp206c_channels); i2c_set_clientdata(client, indio_dev); /* Do a soft reset on probe */ ret = hp206c_soft_reset(indio_dev); if (ret) { dev_err(&client->dev, "Failed to reset on startup: %d\n", ret); return -ENODEV; } return devm_iio_device_register(&client->dev, indio_dev); } static const struct i2c_device_id hp206c_id[] = { {"hp206c"}, {} }; MODULE_DEVICE_TABLE(i2c, hp206c_id); #ifdef CONFIG_ACPI static const struct acpi_device_id hp206c_acpi_match[] = { {"HOP206C", 0}, { }, }; MODULE_DEVICE_TABLE(acpi, hp206c_acpi_match); #endif static struct i2c_driver hp206c_driver = { .probe = hp206c_probe, .id_table = hp206c_id, .driver = { .name = "hp206c", .acpi_match_table = ACPI_PTR(hp206c_acpi_match), }, }; module_i2c_driver(hp206c_driver); MODULE_DESCRIPTION("HOPERF HP206C precision barometer and altimeter sensor"); MODULE_AUTHOR("Leonard Crestez <leonard.crestez@intel.com>"); MODULE_LICENSE("GPL v2");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1