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656 lines
15 KiB
656 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* mag3110.c - Support for Freescale MAG3110 magnetometer sensor |
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* |
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* Copyright (c) 2013 Peter Meerwald <[email protected]> |
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* |
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* (7-bit I2C slave address 0x0e) |
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* |
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* TODO: irq, user offset, oversampling, continuous mode |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/trigger_consumer.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#include <linux/delay.h> |
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#include <linux/regulator/consumer.h> |
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#define MAG3110_STATUS 0x00 |
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#define MAG3110_OUT_X 0x01 /* MSB first */ |
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#define MAG3110_OUT_Y 0x03 |
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#define MAG3110_OUT_Z 0x05 |
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#define MAG3110_WHO_AM_I 0x07 |
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#define MAG3110_SYSMOD 0x08 |
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#define MAG3110_OFF_X 0x09 /* MSB first */ |
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#define MAG3110_OFF_Y 0x0b |
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#define MAG3110_OFF_Z 0x0d |
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#define MAG3110_DIE_TEMP 0x0f |
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#define MAG3110_CTRL_REG1 0x10 |
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#define MAG3110_CTRL_REG2 0x11 |
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#define MAG3110_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) |
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#define MAG3110_CTRL_DR_MASK (BIT(7) | BIT(6) | BIT(5)) |
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#define MAG3110_CTRL_DR_SHIFT 5 |
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#define MAG3110_CTRL_DR_DEFAULT 0 |
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#define MAG3110_SYSMOD_MODE_MASK GENMASK(1, 0) |
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#define MAG3110_CTRL_TM BIT(1) /* trigger single measurement */ |
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#define MAG3110_CTRL_AC BIT(0) /* continuous measurements */ |
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#define MAG3110_CTRL_AUTO_MRST_EN BIT(7) /* magnetic auto-reset */ |
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#define MAG3110_CTRL_RAW BIT(5) /* measurements not user-offset corrected */ |
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#define MAG3110_DEVICE_ID 0xc4 |
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/* Each client has this additional data */ |
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struct mag3110_data { |
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struct i2c_client *client; |
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struct mutex lock; |
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u8 ctrl_reg1; |
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int sleep_val; |
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struct regulator *vdd_reg; |
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struct regulator *vddio_reg; |
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/* Ensure natural alignment of timestamp */ |
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struct { |
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__be16 channels[3]; |
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u8 temperature; |
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s64 ts __aligned(8); |
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} scan; |
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}; |
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static int mag3110_request(struct mag3110_data *data) |
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{ |
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int ret, tries = 150; |
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if ((data->ctrl_reg1 & MAG3110_CTRL_AC) == 0) { |
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/* trigger measurement */ |
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ret = i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, |
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data->ctrl_reg1 | MAG3110_CTRL_TM); |
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if (ret < 0) |
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return ret; |
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} |
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while (tries-- > 0) { |
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ret = i2c_smbus_read_byte_data(data->client, MAG3110_STATUS); |
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if (ret < 0) |
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return ret; |
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/* wait for data ready */ |
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if ((ret & MAG3110_STATUS_DRDY) == MAG3110_STATUS_DRDY) |
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break; |
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if (data->sleep_val <= 20) |
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usleep_range(data->sleep_val * 250, data->sleep_val * 500); |
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else |
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msleep(20); |
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} |
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if (tries < 0) { |
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dev_err(&data->client->dev, "data not ready\n"); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int mag3110_read(struct mag3110_data *data, __be16 buf[3]) |
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{ |
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int ret; |
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mutex_lock(&data->lock); |
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ret = mag3110_request(data); |
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if (ret < 0) { |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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ret = i2c_smbus_read_i2c_block_data(data->client, |
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MAG3110_OUT_X, 3 * sizeof(__be16), (u8 *) buf); |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static ssize_t mag3110_show_int_plus_micros(char *buf, |
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const int (*vals)[2], int n) |
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{ |
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size_t len = 0; |
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while (n-- > 0) |
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len += scnprintf(buf + len, PAGE_SIZE - len, |
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"%d.%06d ", vals[n][0], vals[n][1]); |
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/* replace trailing space by newline */ |
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buf[len - 1] = '\n'; |
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return len; |
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} |
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static int mag3110_get_int_plus_micros_index(const int (*vals)[2], int n, |
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int val, int val2) |
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{ |
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while (n-- > 0) |
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if (val == vals[n][0] && val2 == vals[n][1]) |
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return n; |
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return -EINVAL; |
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} |
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static const int mag3110_samp_freq[8][2] = { |
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{80, 0}, {40, 0}, {20, 0}, {10, 0}, {5, 0}, {2, 500000}, |
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{1, 250000}, {0, 625000} |
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}; |
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static ssize_t mag3110_show_samp_freq_avail(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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return mag3110_show_int_plus_micros(buf, mag3110_samp_freq, 8); |
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} |
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static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mag3110_show_samp_freq_avail); |
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static int mag3110_get_samp_freq_index(struct mag3110_data *data, |
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int val, int val2) |
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{ |
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return mag3110_get_int_plus_micros_index(mag3110_samp_freq, 8, val, |
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val2); |
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} |
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static int mag3110_calculate_sleep(struct mag3110_data *data) |
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{ |
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int ret, i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT; |
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if (mag3110_samp_freq[i][0] > 0) |
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ret = 1000 / mag3110_samp_freq[i][0]; |
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else |
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ret = 1000; |
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return ret == 0 ? 1 : ret; |
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} |
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static int mag3110_standby(struct mag3110_data *data) |
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{ |
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return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, |
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data->ctrl_reg1 & ~MAG3110_CTRL_AC); |
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} |
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static int mag3110_wait_standby(struct mag3110_data *data) |
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{ |
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int ret, tries = 30; |
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/* |
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* Takes up to 1/ODR to come out of active mode into stby |
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* Longest expected period is 12.5seconds. |
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* We'll sleep for 500ms between checks |
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*/ |
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while (tries-- > 0) { |
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ret = i2c_smbus_read_byte_data(data->client, MAG3110_SYSMOD); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "i2c error\n"); |
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return ret; |
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} |
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/* wait for standby */ |
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if ((ret & MAG3110_SYSMOD_MODE_MASK) == 0) |
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break; |
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msleep_interruptible(500); |
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} |
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if (tries < 0) { |
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dev_err(&data->client->dev, "device not entering standby mode\n"); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int mag3110_active(struct mag3110_data *data) |
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{ |
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return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, |
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data->ctrl_reg1); |
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} |
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/* returns >0 if active, 0 if in standby and <0 on error */ |
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static int mag3110_is_active(struct mag3110_data *data) |
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{ |
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int reg; |
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reg = i2c_smbus_read_byte_data(data->client, MAG3110_CTRL_REG1); |
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if (reg < 0) |
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return reg; |
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return reg & MAG3110_CTRL_AC; |
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} |
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static int mag3110_change_config(struct mag3110_data *data, u8 reg, u8 val) |
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{ |
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int ret; |
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int is_active; |
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mutex_lock(&data->lock); |
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is_active = mag3110_is_active(data); |
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if (is_active < 0) { |
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ret = is_active; |
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goto fail; |
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} |
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/* config can only be changed when in standby */ |
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if (is_active > 0) { |
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ret = mag3110_standby(data); |
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if (ret < 0) |
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goto fail; |
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} |
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/* |
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* After coming out of active we must wait for the part |
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* to transition to STBY. This can take up to 1 /ODR to occur |
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*/ |
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ret = mag3110_wait_standby(data); |
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if (ret < 0) |
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goto fail; |
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ret = i2c_smbus_write_byte_data(data->client, reg, val); |
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if (ret < 0) |
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goto fail; |
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if (is_active > 0) { |
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ret = mag3110_active(data); |
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if (ret < 0) |
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goto fail; |
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} |
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ret = 0; |
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fail: |
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mutex_unlock(&data->lock); |
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return ret; |
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} |
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static int mag3110_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct mag3110_data *data = iio_priv(indio_dev); |
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__be16 buffer[3]; |
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int i, ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = iio_device_claim_direct_mode(indio_dev); |
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if (ret) |
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return ret; |
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switch (chan->type) { |
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case IIO_MAGN: /* in 0.1 uT / LSB */ |
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ret = mag3110_read(data, buffer); |
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if (ret < 0) |
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goto release; |
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*val = sign_extend32( |
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be16_to_cpu(buffer[chan->scan_index]), 15); |
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ret = IIO_VAL_INT; |
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break; |
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case IIO_TEMP: /* in 1 C / LSB */ |
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mutex_lock(&data->lock); |
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ret = mag3110_request(data); |
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if (ret < 0) { |
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mutex_unlock(&data->lock); |
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goto release; |
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} |
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ret = i2c_smbus_read_byte_data(data->client, |
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MAG3110_DIE_TEMP); |
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mutex_unlock(&data->lock); |
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if (ret < 0) |
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goto release; |
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*val = sign_extend32(ret, 7); |
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ret = IIO_VAL_INT; |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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release: |
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iio_device_release_direct_mode(indio_dev); |
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return ret; |
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case IIO_CHAN_INFO_SCALE: |
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switch (chan->type) { |
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case IIO_MAGN: |
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*val = 0; |
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*val2 = 1000; |
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return IIO_VAL_INT_PLUS_MICRO; |
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case IIO_TEMP: |
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*val = 1000; |
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return IIO_VAL_INT; |
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default: |
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return -EINVAL; |
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} |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT; |
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*val = mag3110_samp_freq[i][0]; |
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*val2 = mag3110_samp_freq[i][1]; |
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return IIO_VAL_INT_PLUS_MICRO; |
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case IIO_CHAN_INFO_CALIBBIAS: |
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ret = i2c_smbus_read_word_swapped(data->client, |
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MAG3110_OFF_X + 2 * chan->scan_index); |
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if (ret < 0) |
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return ret; |
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*val = sign_extend32(ret >> 1, 14); |
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return IIO_VAL_INT; |
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} |
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return -EINVAL; |
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} |
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static int mag3110_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, int val2, long mask) |
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{ |
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struct mag3110_data *data = iio_priv(indio_dev); |
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int rate, ret; |
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ret = iio_device_claim_direct_mode(indio_dev); |
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if (ret) |
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return ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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rate = mag3110_get_samp_freq_index(data, val, val2); |
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if (rate < 0) { |
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ret = -EINVAL; |
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break; |
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} |
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data->ctrl_reg1 &= 0xff & ~MAG3110_CTRL_DR_MASK |
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& ~MAG3110_CTRL_AC; |
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data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT; |
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data->sleep_val = mag3110_calculate_sleep(data); |
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if (data->sleep_val < 40) |
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data->ctrl_reg1 |= MAG3110_CTRL_AC; |
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ret = mag3110_change_config(data, MAG3110_CTRL_REG1, |
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data->ctrl_reg1); |
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break; |
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case IIO_CHAN_INFO_CALIBBIAS: |
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if (val < -10000 || val > 10000) { |
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ret = -EINVAL; |
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break; |
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} |
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ret = i2c_smbus_write_word_swapped(data->client, |
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MAG3110_OFF_X + 2 * chan->scan_index, val << 1); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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iio_device_release_direct_mode(indio_dev); |
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return ret; |
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} |
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static irqreturn_t mag3110_trigger_handler(int irq, void *p) |
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{ |
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struct iio_poll_func *pf = p; |
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struct iio_dev *indio_dev = pf->indio_dev; |
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struct mag3110_data *data = iio_priv(indio_dev); |
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int ret; |
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ret = mag3110_read(data, data->scan.channels); |
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if (ret < 0) |
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goto done; |
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if (test_bit(3, indio_dev->active_scan_mask)) { |
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ret = i2c_smbus_read_byte_data(data->client, |
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MAG3110_DIE_TEMP); |
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if (ret < 0) |
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goto done; |
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data->scan.temperature = ret; |
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} |
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
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iio_get_time_ns(indio_dev)); |
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done: |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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} |
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#define MAG3110_CHANNEL(axis, idx) { \ |
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.type = IIO_MAGN, \ |
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.modified = 1, \ |
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.channel2 = IIO_MOD_##axis, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
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BIT(IIO_CHAN_INFO_CALIBBIAS), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ |
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BIT(IIO_CHAN_INFO_SCALE), \ |
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.scan_index = idx, \ |
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.scan_type = { \ |
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.sign = 's', \ |
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.realbits = 16, \ |
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.storagebits = 16, \ |
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.endianness = IIO_BE, \ |
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}, \ |
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} |
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static const struct iio_chan_spec mag3110_channels[] = { |
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MAG3110_CHANNEL(X, 0), |
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MAG3110_CHANNEL(Y, 1), |
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MAG3110_CHANNEL(Z, 2), |
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{ |
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.type = IIO_TEMP, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
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BIT(IIO_CHAN_INFO_SCALE), |
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.scan_index = 3, |
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.scan_type = { |
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.sign = 's', |
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.realbits = 8, |
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.storagebits = 8, |
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}, |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(4), |
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}; |
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static struct attribute *mag3110_attributes[] = { |
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group mag3110_group = { |
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.attrs = mag3110_attributes, |
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}; |
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static const struct iio_info mag3110_info = { |
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.attrs = &mag3110_group, |
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.read_raw = &mag3110_read_raw, |
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.write_raw = &mag3110_write_raw, |
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}; |
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static const unsigned long mag3110_scan_masks[] = {0x7, 0xf, 0}; |
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static int mag3110_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct mag3110_data *data; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) |
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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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data->vdd_reg = devm_regulator_get(&client->dev, "vdd"); |
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if (IS_ERR(data->vdd_reg)) |
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return dev_err_probe(&client->dev, PTR_ERR(data->vdd_reg), |
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"failed to get VDD regulator!\n"); |
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data->vddio_reg = devm_regulator_get(&client->dev, "vddio"); |
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if (IS_ERR(data->vddio_reg)) |
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return dev_err_probe(&client->dev, PTR_ERR(data->vddio_reg), |
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"failed to get VDDIO regulator!\n"); |
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ret = regulator_enable(data->vdd_reg); |
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if (ret) { |
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dev_err(&client->dev, "failed to enable VDD regulator!\n"); |
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return ret; |
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} |
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ret = regulator_enable(data->vddio_reg); |
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if (ret) { |
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dev_err(&client->dev, "failed to enable VDDIO regulator!\n"); |
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goto disable_regulator_vdd; |
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} |
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ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I); |
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if (ret < 0) |
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goto disable_regulators; |
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if (ret != MAG3110_DEVICE_ID) { |
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ret = -ENODEV; |
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goto disable_regulators; |
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} |
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data->client = client; |
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mutex_init(&data->lock); |
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i2c_set_clientdata(client, indio_dev); |
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indio_dev->info = &mag3110_info; |
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indio_dev->name = id->name; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = mag3110_channels; |
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indio_dev->num_channels = ARRAY_SIZE(mag3110_channels); |
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indio_dev->available_scan_masks = mag3110_scan_masks; |
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|
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data->ctrl_reg1 = MAG3110_CTRL_DR_DEFAULT << MAG3110_CTRL_DR_SHIFT; |
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data->sleep_val = mag3110_calculate_sleep(data); |
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if (data->sleep_val < 40) |
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data->ctrl_reg1 |= MAG3110_CTRL_AC; |
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ret = mag3110_change_config(data, MAG3110_CTRL_REG1, data->ctrl_reg1); |
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if (ret < 0) |
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goto disable_regulators; |
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ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG2, |
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MAG3110_CTRL_AUTO_MRST_EN); |
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if (ret < 0) |
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goto standby_on_error; |
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ret = iio_triggered_buffer_setup(indio_dev, NULL, |
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mag3110_trigger_handler, NULL); |
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if (ret < 0) |
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goto standby_on_error; |
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ret = iio_device_register(indio_dev); |
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if (ret < 0) |
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goto buffer_cleanup; |
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return 0; |
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buffer_cleanup: |
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iio_triggered_buffer_cleanup(indio_dev); |
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standby_on_error: |
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mag3110_standby(iio_priv(indio_dev)); |
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disable_regulators: |
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regulator_disable(data->vddio_reg); |
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disable_regulator_vdd: |
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regulator_disable(data->vdd_reg); |
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|
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return ret; |
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} |
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|
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static int mag3110_remove(struct i2c_client *client) |
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{ |
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struct iio_dev *indio_dev = i2c_get_clientdata(client); |
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struct mag3110_data *data = iio_priv(indio_dev); |
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|
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iio_device_unregister(indio_dev); |
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iio_triggered_buffer_cleanup(indio_dev); |
|
mag3110_standby(iio_priv(indio_dev)); |
|
regulator_disable(data->vddio_reg); |
|
regulator_disable(data->vdd_reg); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int mag3110_suspend(struct device *dev) |
|
{ |
|
struct mag3110_data *data = iio_priv(i2c_get_clientdata( |
|
to_i2c_client(dev))); |
|
int ret; |
|
|
|
ret = mag3110_standby(iio_priv(i2c_get_clientdata( |
|
to_i2c_client(dev)))); |
|
if (ret) |
|
return ret; |
|
|
|
ret = regulator_disable(data->vddio_reg); |
|
if (ret) { |
|
dev_err(dev, "failed to disable VDDIO regulator\n"); |
|
return ret; |
|
} |
|
|
|
ret = regulator_disable(data->vdd_reg); |
|
if (ret) { |
|
dev_err(dev, "failed to disable VDD regulator\n"); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int mag3110_resume(struct device *dev) |
|
{ |
|
struct mag3110_data *data = iio_priv(i2c_get_clientdata( |
|
to_i2c_client(dev))); |
|
int ret; |
|
|
|
ret = regulator_enable(data->vdd_reg); |
|
if (ret) { |
|
dev_err(dev, "failed to enable VDD regulator\n"); |
|
return ret; |
|
} |
|
|
|
ret = regulator_enable(data->vddio_reg); |
|
if (ret) { |
|
dev_err(dev, "failed to enable VDDIO regulator\n"); |
|
regulator_disable(data->vdd_reg); |
|
return ret; |
|
} |
|
|
|
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, |
|
data->ctrl_reg1); |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(mag3110_pm_ops, mag3110_suspend, mag3110_resume); |
|
#define MAG3110_PM_OPS (&mag3110_pm_ops) |
|
#else |
|
#define MAG3110_PM_OPS NULL |
|
#endif |
|
|
|
static const struct i2c_device_id mag3110_id[] = { |
|
{ "mag3110", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, mag3110_id); |
|
|
|
static const struct of_device_id mag3110_of_match[] = { |
|
{ .compatible = "fsl,mag3110" }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, mag3110_of_match); |
|
|
|
static struct i2c_driver mag3110_driver = { |
|
.driver = { |
|
.name = "mag3110", |
|
.of_match_table = mag3110_of_match, |
|
.pm = MAG3110_PM_OPS, |
|
}, |
|
.probe = mag3110_probe, |
|
.remove = mag3110_remove, |
|
.id_table = mag3110_id, |
|
}; |
|
module_i2c_driver(mag3110_driver); |
|
|
|
MODULE_AUTHOR("Peter Meerwald <[email protected]>"); |
|
MODULE_DESCRIPTION("Freescale MAG3110 magnetometer driver"); |
|
MODULE_LICENSE("GPL");
|
|
|