Cristina Opriceana | 6cf23df | 2015-03-22 20:43:16 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Device driver for the the HMC5843 multi-chip module designed |
| 3 | * for low field magnetic sensing. |
| 4 | * |
| 5 | * Copyright (C) 2010 Texas Instruments |
| 6 | * |
| 7 | * Author: Shubhrajyoti Datta <shubhrajyoti@ti.com> |
| 8 | * Acknowledgment: Jonathan Cameron <jic23@kernel.org> for valuable inputs. |
| 9 | * Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>. |
| 10 | * Split to multiple files by Josef Gajdusek <atx@atx.name> - 2014 |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | */ |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 23 | |
| 24 | #include <linux/module.h> |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 25 | #include <linux/regmap.h> |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 26 | #include <linux/iio/iio.h> |
| 27 | #include <linux/iio/sysfs.h> |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 28 | #include <linux/iio/trigger_consumer.h> |
| 29 | #include <linux/iio/buffer.h> |
| 30 | #include <linux/iio/triggered_buffer.h> |
Peter Meerwald | 4dedf31 | 2013-07-27 16:31:00 +0100 | [diff] [blame] | 31 | #include <linux/delay.h> |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 32 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 33 | #include "hmc5843.h" |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 34 | |
| 35 | /* |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 36 | * Range gain settings in (+-)Ga |
| 37 | * Beware: HMC5843 and HMC5883 have different recommended sensor field |
| 38 | * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively |
| 39 | */ |
| 40 | #define HMC5843_RANGE_GAIN_OFFSET 0x05 |
| 41 | #define HMC5843_RANGE_GAIN_DEFAULT 0x01 |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 42 | #define HMC5843_RANGE_GAIN_MASK 0xe0 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 43 | |
Peter Meerwald | 9728fe3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 44 | /* Device status */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 45 | #define HMC5843_DATA_READY 0x01 |
| 46 | #define HMC5843_DATA_OUTPUT_LOCK 0x02 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 47 | |
Peter Meerwald | 9728fe3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 48 | /* Mode register configuration */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 49 | #define HMC5843_MODE_CONVERSION_CONTINUOUS 0x00 |
| 50 | #define HMC5843_MODE_CONVERSION_SINGLE 0x01 |
| 51 | #define HMC5843_MODE_IDLE 0x02 |
| 52 | #define HMC5843_MODE_SLEEP 0x03 |
| 53 | #define HMC5843_MODE_MASK 0x03 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 54 | |
| 55 | /* |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 56 | * HMC5843: Minimum data output rate |
| 57 | * HMC5883: Typical data output rate |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 58 | */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 59 | #define HMC5843_RATE_OFFSET 0x02 |
Peter Meerwald | 8e2e297 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 60 | #define HMC5843_RATE_DEFAULT 0x04 |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 61 | #define HMC5843_RATE_MASK 0x1c |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 62 | |
Peter Meerwald | 9728fe3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 63 | /* Device measurement configuration */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 64 | #define HMC5843_MEAS_CONF_NORMAL 0x00 |
| 65 | #define HMC5843_MEAS_CONF_POSITIVE_BIAS 0x01 |
| 66 | #define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02 |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 67 | #define HMC5843_MEAS_CONF_MASK 0x03 |
| 68 | |
Peter Meerwald | 9728fe3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 69 | /* Scaling factors: 10000000/Gain */ |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 70 | static const int hmc5843_regval_to_nanoscale[] = { |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 71 | 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 72 | }; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 73 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 74 | static const int hmc5883_regval_to_nanoscale[] = { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 75 | 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662 |
| 76 | }; |
| 77 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 78 | static const int hmc5883l_regval_to_nanoscale[] = { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 79 | 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478 |
| 80 | }; |
| 81 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 82 | /* |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 83 | * From the datasheet: |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 84 | * Value | HMC5843 | HMC5883/HMC5883L |
| 85 | * | Data output rate (Hz) | Data output rate (Hz) |
| 86 | * 0 | 0.5 | 0.75 |
| 87 | * 1 | 1 | 1.5 |
| 88 | * 2 | 2 | 3 |
| 89 | * 3 | 5 | 7.5 |
| 90 | * 4 | 10 (default) | 15 |
| 91 | * 5 | 20 | 30 |
| 92 | * 6 | 50 | 75 |
| 93 | * 7 | Not used | Not used |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 94 | */ |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 95 | static const int hmc5843_regval_to_samp_freq[][2] = { |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 96 | {0, 500000}, {1, 0}, {2, 0}, {5, 0}, {10, 0}, {20, 0}, {50, 0} |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 97 | }; |
| 98 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 99 | static const int hmc5883_regval_to_samp_freq[][2] = { |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 100 | {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0}, |
| 101 | {75, 0} |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 102 | }; |
| 103 | |
Josef Gajdusek | 5a059bd | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 104 | static const int hmc5983_regval_to_samp_freq[][2] = { |
| 105 | {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0}, |
| 106 | {75, 0}, {220, 0} |
| 107 | }; |
| 108 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 109 | /* Describe chip variants */ |
| 110 | struct hmc5843_chip_info { |
| 111 | const struct iio_chan_spec *channels; |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 112 | const int (*regval_to_samp_freq)[2]; |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 113 | const int n_regval_to_samp_freq; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 114 | const int *regval_to_nanoscale; |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 115 | const int n_regval_to_nanoscale; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 116 | }; |
| 117 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 118 | /* The lower two bits contain the current conversion mode */ |
Peter Meerwald | 6224875 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 119 | static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 120 | { |
Peter Meerwald | 6224875 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 121 | int ret; |
| 122 | |
| 123 | mutex_lock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 124 | ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 125 | HMC5843_MODE_MASK, operating_mode); |
Peter Meerwald | 6224875 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 126 | mutex_unlock(&data->lock); |
| 127 | |
| 128 | return ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 129 | } |
| 130 | |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 131 | static int hmc5843_wait_measurement(struct hmc5843_data *data) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 132 | { |
Peter Meerwald | 4dedf31 | 2013-07-27 16:31:00 +0100 | [diff] [blame] | 133 | int tries = 150; |
Teodora Baluta | 883fc26 | 2014-07-28 12:18:00 +0100 | [diff] [blame] | 134 | unsigned int val; |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 135 | int ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 136 | |
Peter Meerwald | 4dedf31 | 2013-07-27 16:31:00 +0100 | [diff] [blame] | 137 | while (tries-- > 0) { |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 138 | ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val); |
| 139 | if (ret < 0) |
| 140 | return ret; |
| 141 | if (val & HMC5843_DATA_READY) |
Peter Meerwald | 4dedf31 | 2013-07-27 16:31:00 +0100 | [diff] [blame] | 142 | break; |
| 143 | msleep(20); |
| 144 | } |
| 145 | |
| 146 | if (tries < 0) { |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 147 | dev_err(data->dev, "data not ready\n"); |
Peter Meerwald | 4dedf31 | 2013-07-27 16:31:00 +0100 | [diff] [blame] | 148 | return -EIO; |
| 149 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 150 | |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | /* Return the measurement value from the specified channel */ |
| 155 | static int hmc5843_read_measurement(struct hmc5843_data *data, |
| 156 | int idx, int *val) |
| 157 | { |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 158 | __be16 values[3]; |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 159 | int ret; |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 160 | |
| 161 | mutex_lock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 162 | ret = hmc5843_wait_measurement(data); |
| 163 | if (ret < 0) { |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 164 | mutex_unlock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 165 | return ret; |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 166 | } |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 167 | ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 168 | values, sizeof(values)); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 169 | mutex_unlock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 170 | if (ret < 0) |
| 171 | return ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 172 | |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 173 | *val = sign_extend32(be16_to_cpu(values[idx]), 15); |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 174 | return IIO_VAL_INT; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 175 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 176 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 177 | /* |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 178 | * API for setting the measurement configuration to |
| 179 | * Normal, Positive bias and Negative bias |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 180 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 181 | * From the datasheet: |
| 182 | * 0 - Normal measurement configuration (default): In normal measurement |
| 183 | * configuration the device follows normal measurement flow. Pins BP |
| 184 | * and BN are left floating and high impedance. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 185 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 186 | * 1 - Positive bias configuration: In positive bias configuration, a |
| 187 | * positive current is forced across the resistive load on pins BP |
| 188 | * and BN. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 189 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 190 | * 2 - Negative bias configuration. In negative bias configuration, a |
| 191 | * negative current is forced across the resistive load on pins BP |
| 192 | * and BN. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 193 | * |
| 194 | */ |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 195 | static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 196 | { |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 197 | int ret; |
| 198 | |
| 199 | mutex_lock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 200 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 201 | HMC5843_MEAS_CONF_MASK, meas_conf); |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 202 | mutex_unlock(&data->lock); |
| 203 | |
| 204 | return ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 205 | } |
| 206 | |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 207 | static |
| 208 | ssize_t hmc5843_show_measurement_configuration(struct device *dev, |
| 209 | struct device_attribute *attr, |
| 210 | char *buf) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 211 | { |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 212 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
Teodora Baluta | 883fc26 | 2014-07-28 12:18:00 +0100 | [diff] [blame] | 213 | unsigned int val; |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 214 | int ret; |
| 215 | |
| 216 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val); |
| 217 | if (ret) |
| 218 | return ret; |
| 219 | val &= HMC5843_MEAS_CONF_MASK; |
| 220 | |
| 221 | return sprintf(buf, "%d\n", val); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 222 | } |
| 223 | |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 224 | static |
| 225 | ssize_t hmc5843_set_measurement_configuration(struct device *dev, |
| 226 | struct device_attribute *attr, |
| 227 | const char *buf, |
| 228 | size_t count) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 229 | { |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 230 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 231 | unsigned long meas_conf = 0; |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 232 | int ret; |
Peter Meerwald | e278df1 | 2012-05-17 02:28:09 +0200 | [diff] [blame] | 233 | |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 234 | ret = kstrtoul(buf, 10, &meas_conf); |
| 235 | if (ret) |
| 236 | return ret; |
| 237 | if (meas_conf >= HMC5843_MEAS_CONF_MASK) |
Peter Meerwald | e278df1 | 2012-05-17 02:28:09 +0200 | [diff] [blame] | 238 | return -EINVAL; |
| 239 | |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 240 | ret = hmc5843_set_meas_conf(data, meas_conf); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 241 | |
Peter Meerwald | 4f1ca41 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 242 | return (ret < 0) ? ret : count; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 243 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 244 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 245 | static IIO_DEVICE_ATTR(meas_conf, |
| 246 | S_IWUSR | S_IRUGO, |
| 247 | hmc5843_show_measurement_configuration, |
| 248 | hmc5843_set_measurement_configuration, |
| 249 | 0); |
| 250 | |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 251 | static |
| 252 | ssize_t hmc5843_show_samp_freq_avail(struct device *dev, |
| 253 | struct device_attribute *attr, char *buf) |
Peter Meerwald | dd28e48 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 254 | { |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 255 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
Peter Meerwald | dd28e48 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 256 | size_t len = 0; |
| 257 | int i; |
| 258 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 259 | for (i = 0; i < data->variant->n_regval_to_samp_freq; i++) |
Peter Meerwald | dd28e48 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 260 | len += scnprintf(buf + len, PAGE_SIZE - len, |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 261 | "%d.%d ", data->variant->regval_to_samp_freq[i][0], |
| 262 | data->variant->regval_to_samp_freq[i][1]); |
Peter Meerwald | dd28e48 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 263 | |
| 264 | /* replace trailing space by newline */ |
| 265 | buf[len - 1] = '\n'; |
| 266 | |
| 267 | return len; |
| 268 | } |
| 269 | |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 270 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_samp_freq_avail); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 271 | |
Peter Meerwald | ca4c617 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 272 | static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 273 | { |
Peter Meerwald | ca4c617 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 274 | int ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 275 | |
Peter Meerwald | ca4c617 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 276 | mutex_lock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 277 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 278 | HMC5843_RATE_MASK, |
| 279 | rate << HMC5843_RATE_OFFSET); |
Peter Meerwald | ca4c617 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 280 | mutex_unlock(&data->lock); |
| 281 | |
| 282 | return ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 283 | } |
| 284 | |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 285 | static int hmc5843_get_samp_freq_index(struct hmc5843_data *data, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 286 | int val, int val2) |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 287 | { |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 288 | int i; |
| 289 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 290 | for (i = 0; i < data->variant->n_regval_to_samp_freq; i++) |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 291 | if (val == data->variant->regval_to_samp_freq[i][0] && |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 292 | val2 == data->variant->regval_to_samp_freq[i][1]) |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 293 | return i; |
| 294 | |
| 295 | return -EINVAL; |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 296 | } |
| 297 | |
Peter Meerwald | f3f7551 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 298 | static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range) |
| 299 | { |
| 300 | int ret; |
| 301 | |
| 302 | mutex_lock(&data->lock); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 303 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 304 | HMC5843_RANGE_GAIN_MASK, |
| 305 | range << HMC5843_RANGE_GAIN_OFFSET); |
Peter Meerwald | f3f7551 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 306 | mutex_unlock(&data->lock); |
| 307 | |
| 308 | return ret; |
| 309 | } |
| 310 | |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 311 | static ssize_t hmc5843_show_scale_avail(struct device *dev, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 312 | struct device_attribute *attr, |
| 313 | char *buf) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 314 | { |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 315 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 316 | |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 317 | size_t len = 0; |
| 318 | int i; |
| 319 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 320 | for (i = 0; i < data->variant->n_regval_to_nanoscale; i++) |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 321 | len += scnprintf(buf + len, PAGE_SIZE - len, |
| 322 | "0.%09d ", data->variant->regval_to_nanoscale[i]); |
| 323 | |
| 324 | /* replace trailing space by newline */ |
| 325 | buf[len - 1] = '\n'; |
| 326 | |
| 327 | return len; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 328 | } |
| 329 | |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 330 | static IIO_DEVICE_ATTR(scale_available, S_IRUGO, |
| 331 | hmc5843_show_scale_avail, NULL, 0); |
| 332 | |
| 333 | static int hmc5843_get_scale_index(struct hmc5843_data *data, int val, int val2) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 334 | { |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 335 | int i; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 336 | |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 337 | if (val != 0) |
| 338 | return -EINVAL; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 339 | |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 340 | for (i = 0; i < data->variant->n_regval_to_nanoscale; i++) |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 341 | if (val2 == data->variant->regval_to_nanoscale[i]) |
| 342 | return i; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 343 | |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 344 | return -EINVAL; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 345 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 346 | |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 347 | static int hmc5843_read_raw(struct iio_dev *indio_dev, |
| 348 | struct iio_chan_spec const *chan, |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 349 | int *val, int *val2, long mask) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 350 | { |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 351 | struct hmc5843_data *data = iio_priv(indio_dev); |
Teodora Baluta | 883fc26 | 2014-07-28 12:18:00 +0100 | [diff] [blame] | 352 | unsigned int rval; |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 353 | int ret; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 354 | |
| 355 | switch (mask) { |
Jonathan Cameron | 4d9948b | 2012-04-15 17:41:23 +0100 | [diff] [blame] | 356 | case IIO_CHAN_INFO_RAW: |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 357 | return hmc5843_read_measurement(data, chan->scan_index, val); |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 358 | case IIO_CHAN_INFO_SCALE: |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 359 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval); |
| 360 | if (ret < 0) |
| 361 | return ret; |
| 362 | rval >>= HMC5843_RANGE_GAIN_OFFSET; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 363 | *val = 0; |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 364 | *val2 = data->variant->regval_to_nanoscale[rval]; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 365 | return IIO_VAL_INT_PLUS_NANO; |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 366 | case IIO_CHAN_INFO_SAMP_FREQ: |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 367 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval); |
| 368 | if (ret < 0) |
| 369 | return ret; |
| 370 | rval >>= HMC5843_RATE_OFFSET; |
| 371 | *val = data->variant->regval_to_samp_freq[rval][0]; |
| 372 | *val2 = data->variant->regval_to_samp_freq[rval][1]; |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 373 | return IIO_VAL_INT_PLUS_MICRO; |
Peter Senna Tschudin | 73327b4 | 2012-09-28 10:57:00 +0100 | [diff] [blame] | 374 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 375 | return -EINVAL; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 376 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 377 | |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 378 | static int hmc5843_write_raw(struct iio_dev *indio_dev, |
| 379 | struct iio_chan_spec const *chan, |
| 380 | int val, int val2, long mask) |
| 381 | { |
| 382 | struct hmc5843_data *data = iio_priv(indio_dev); |
Peter Meerwald | f3f7551 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 383 | int rate, range; |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 384 | |
| 385 | switch (mask) { |
| 386 | case IIO_CHAN_INFO_SAMP_FREQ: |
Peter Meerwald | 9a3b2d5 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 387 | rate = hmc5843_get_samp_freq_index(data, val, val2); |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 388 | if (rate < 0) |
| 389 | return -EINVAL; |
| 390 | |
Peter Meerwald | ca4c617 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 391 | return hmc5843_set_samp_freq(data, rate); |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 392 | case IIO_CHAN_INFO_SCALE: |
| 393 | range = hmc5843_get_scale_index(data, val, val2); |
| 394 | if (range < 0) |
| 395 | return -EINVAL; |
| 396 | |
Peter Meerwald | f3f7551 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 397 | return hmc5843_set_range_gain(data, range); |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 398 | default: |
| 399 | return -EINVAL; |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | static int hmc5843_write_raw_get_fmt(struct iio_dev *indio_dev, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 404 | struct iio_chan_spec const *chan, |
| 405 | long mask) |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 406 | { |
| 407 | switch (mask) { |
| 408 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 409 | return IIO_VAL_INT_PLUS_MICRO; |
| 410 | case IIO_CHAN_INFO_SCALE: |
| 411 | return IIO_VAL_INT_PLUS_NANO; |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 412 | default: |
| 413 | return -EINVAL; |
| 414 | } |
| 415 | } |
| 416 | |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 417 | static irqreturn_t hmc5843_trigger_handler(int irq, void *p) |
| 418 | { |
| 419 | struct iio_poll_func *pf = p; |
| 420 | struct iio_dev *indio_dev = pf->indio_dev; |
| 421 | struct hmc5843_data *data = iio_priv(indio_dev); |
| 422 | int ret; |
| 423 | |
| 424 | mutex_lock(&data->lock); |
| 425 | ret = hmc5843_wait_measurement(data); |
| 426 | if (ret < 0) { |
| 427 | mutex_unlock(&data->lock); |
| 428 | goto done; |
| 429 | } |
| 430 | |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 431 | ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 432 | data->buffer, 3 * sizeof(__be16)); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 433 | |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 434 | mutex_unlock(&data->lock); |
| 435 | if (ret < 0) |
| 436 | goto done; |
| 437 | |
| 438 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 439 | iio_get_time_ns()); |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 440 | |
| 441 | done: |
| 442 | iio_trigger_notify_done(indio_dev->trig); |
| 443 | |
| 444 | return IRQ_HANDLED; |
| 445 | } |
| 446 | |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 447 | #define HMC5843_CHANNEL(axis, idx) \ |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 448 | { \ |
| 449 | .type = IIO_MAGN, \ |
| 450 | .modified = 1, \ |
| 451 | .channel2 = IIO_MOD_##axis, \ |
Jonathan Cameron | b370097 | 2013-02-27 19:40:58 +0000 | [diff] [blame] | 452 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 453 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
| 454 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 455 | .scan_index = idx, \ |
Jonathan Cameron | c5fe7a41 | 2013-12-11 18:45:00 +0000 | [diff] [blame] | 456 | .scan_type = { \ |
| 457 | .sign = 's', \ |
| 458 | .realbits = 16, \ |
| 459 | .storagebits = 16, \ |
| 460 | .endianness = IIO_BE, \ |
| 461 | }, \ |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | static const struct iio_chan_spec hmc5843_channels[] = { |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 465 | HMC5843_CHANNEL(X, 0), |
| 466 | HMC5843_CHANNEL(Y, 1), |
| 467 | HMC5843_CHANNEL(Z, 2), |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 468 | IIO_CHAN_SOFT_TIMESTAMP(3), |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 469 | }; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 470 | |
Josef Gajdusek | 5a059bd | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 471 | /* Beware: Y and Z are exchanged on HMC5883 and 5983 */ |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 472 | static const struct iio_chan_spec hmc5883_channels[] = { |
Peter Meerwald | 39c1882 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 473 | HMC5843_CHANNEL(X, 0), |
| 474 | HMC5843_CHANNEL(Z, 1), |
| 475 | HMC5843_CHANNEL(Y, 2), |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 476 | IIO_CHAN_SOFT_TIMESTAMP(3), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 477 | }; |
| 478 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 479 | static struct attribute *hmc5843_attributes[] = { |
| 480 | &iio_dev_attr_meas_conf.dev_attr.attr, |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 481 | &iio_dev_attr_scale_available.dev_attr.attr, |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 482 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 483 | NULL |
| 484 | }; |
| 485 | |
| 486 | static const struct attribute_group hmc5843_group = { |
| 487 | .attrs = hmc5843_attributes, |
| 488 | }; |
| 489 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 490 | static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = { |
| 491 | [HMC5843_ID] = { |
| 492 | .channels = hmc5843_channels, |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 493 | .regval_to_samp_freq = hmc5843_regval_to_samp_freq, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 494 | .n_regval_to_samp_freq = |
| 495 | ARRAY_SIZE(hmc5843_regval_to_samp_freq), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 496 | .regval_to_nanoscale = hmc5843_regval_to_nanoscale, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 497 | .n_regval_to_nanoscale = |
| 498 | ARRAY_SIZE(hmc5843_regval_to_nanoscale), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 499 | }, |
| 500 | [HMC5883_ID] = { |
| 501 | .channels = hmc5883_channels, |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 502 | .regval_to_samp_freq = hmc5883_regval_to_samp_freq, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 503 | .n_regval_to_samp_freq = |
| 504 | ARRAY_SIZE(hmc5883_regval_to_samp_freq), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 505 | .regval_to_nanoscale = hmc5883_regval_to_nanoscale, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 506 | .n_regval_to_nanoscale = |
| 507 | ARRAY_SIZE(hmc5883_regval_to_nanoscale), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 508 | }, |
| 509 | [HMC5883L_ID] = { |
| 510 | .channels = hmc5883_channels, |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 511 | .regval_to_samp_freq = hmc5883_regval_to_samp_freq, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 512 | .n_regval_to_samp_freq = |
| 513 | ARRAY_SIZE(hmc5883_regval_to_samp_freq), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 514 | .regval_to_nanoscale = hmc5883l_regval_to_nanoscale, |
Josef Gajdusek | 585f7ce | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 515 | .n_regval_to_nanoscale = |
| 516 | ARRAY_SIZE(hmc5883l_regval_to_nanoscale), |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 517 | }, |
Josef Gajdusek | 5a059bd | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 518 | [HMC5983_ID] = { |
| 519 | .channels = hmc5883_channels, |
| 520 | .regval_to_samp_freq = hmc5983_regval_to_samp_freq, |
| 521 | .n_regval_to_samp_freq = |
| 522 | ARRAY_SIZE(hmc5983_regval_to_samp_freq), |
| 523 | .regval_to_nanoscale = hmc5883l_regval_to_nanoscale, |
| 524 | .n_regval_to_nanoscale = |
| 525 | ARRAY_SIZE(hmc5883l_regval_to_nanoscale), |
| 526 | } |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 527 | }; |
| 528 | |
Peter Meerwald | 9d5ad0c | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 529 | static int hmc5843_init(struct hmc5843_data *data) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 530 | { |
Peter Meerwald | 9d5ad0c | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 531 | int ret; |
| 532 | u8 id[3]; |
| 533 | |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 534 | ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 535 | id, ARRAY_SIZE(id)); |
Peter Meerwald | 9d5ad0c | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 536 | if (ret < 0) |
| 537 | return ret; |
| 538 | if (id[0] != 'H' || id[1] != '4' || id[2] != '3') { |
Josef Gajdusek | 5a059bd | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 539 | dev_err(data->dev, "no HMC5843/5883/5883L/5983 sensor\n"); |
Peter Meerwald | 9d5ad0c | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 540 | return -ENODEV; |
| 541 | } |
| 542 | |
| 543 | ret = hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL); |
| 544 | if (ret < 0) |
| 545 | return ret; |
| 546 | ret = hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT); |
| 547 | if (ret < 0) |
| 548 | return ret; |
| 549 | ret = hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT); |
| 550 | if (ret < 0) |
| 551 | return ret; |
| 552 | return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 553 | } |
| 554 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 555 | static const struct iio_info hmc5843_info = { |
| 556 | .attrs = &hmc5843_group, |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 557 | .read_raw = &hmc5843_read_raw, |
Peter Meerwald | d4dc0a3 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 558 | .write_raw = &hmc5843_write_raw, |
Peter Meerwald | ae6f54d | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 559 | .write_raw_get_fmt = &hmc5843_write_raw_get_fmt, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 560 | .driver_module = THIS_MODULE, |
| 561 | }; |
| 562 | |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 563 | static const unsigned long hmc5843_scan_masks[] = {0x7, 0}; |
| 564 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 565 | int hmc5843_common_suspend(struct device *dev) |
| 566 | { |
| 567 | return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)), |
| 568 | HMC5843_MODE_CONVERSION_CONTINUOUS); |
| 569 | } |
| 570 | EXPORT_SYMBOL(hmc5843_common_suspend); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 571 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 572 | int hmc5843_common_resume(struct device *dev) |
| 573 | { |
| 574 | return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)), |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 575 | HMC5843_MODE_SLEEP); |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 576 | } |
| 577 | EXPORT_SYMBOL(hmc5843_common_resume); |
Josef Gajdusek | f326a52 | 2014-07-22 16:00:00 +0100 | [diff] [blame] | 578 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 579 | int hmc5843_common_probe(struct device *dev, struct regmap *regmap, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 580 | enum hmc5843_ids id) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 581 | { |
| 582 | struct hmc5843_data *data; |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 583 | struct iio_dev *indio_dev; |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 584 | int ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 585 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 586 | indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
Cristina Opriceana | 9fb163f | 2015-03-19 21:04:42 +0200 | [diff] [blame] | 587 | if (!indio_dev) |
Peter Meerwald | a6dcb71b | 2013-09-03 02:05:00 +0100 | [diff] [blame] | 588 | return -ENOMEM; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 589 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 590 | dev_set_drvdata(dev, indio_dev); |
| 591 | |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 592 | /* default settings at probe */ |
| 593 | data = iio_priv(indio_dev); |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 594 | data->dev = dev; |
| 595 | data->regmap = regmap; |
| 596 | data->variant = &hmc5843_chip_info_tbl[id]; |
Peter Meerwald | 8e2e297 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 597 | mutex_init(&data->lock); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 598 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 599 | indio_dev->dev.parent = dev; |
Marek Belisko | dae7f15 | 2015-02-28 21:54:42 +0100 | [diff] [blame] | 600 | indio_dev->name = dev->driver->name; |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 601 | indio_dev->info = &hmc5843_info; |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 602 | indio_dev->modes = INDIO_DIRECT_MODE; |
Peter Meerwald | 8e2e297 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 603 | indio_dev->channels = data->variant->channels; |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 604 | indio_dev->num_channels = 4; |
| 605 | indio_dev->available_scan_masks = hmc5843_scan_masks; |
Peter Meerwald | 8e2e297 | 2013-09-19 20:35:00 +0100 | [diff] [blame] | 606 | |
Peter Meerwald | 9d5ad0c | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 607 | ret = hmc5843_init(data); |
| 608 | if (ret < 0) |
| 609 | return ret; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 610 | |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 611 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
Cristina Opriceana | 7079f21 | 2015-03-19 21:06:42 +0200 | [diff] [blame] | 612 | hmc5843_trigger_handler, NULL); |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 613 | if (ret < 0) |
Cristina Opriceana | e676705 | 2015-03-22 20:42:42 +0200 | [diff] [blame] | 614 | goto buffer_setup_err; |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 615 | |
| 616 | ret = iio_device_register(indio_dev); |
| 617 | if (ret < 0) |
| 618 | goto buffer_cleanup; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 619 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 620 | return 0; |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 621 | |
| 622 | buffer_cleanup: |
| 623 | iio_triggered_buffer_cleanup(indio_dev); |
Cristina Opriceana | e676705 | 2015-03-22 20:42:42 +0200 | [diff] [blame] | 624 | buffer_setup_err: |
| 625 | hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP); |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 626 | return ret; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 627 | } |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 628 | EXPORT_SYMBOL(hmc5843_common_probe); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 629 | |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 630 | int hmc5843_common_remove(struct device *dev) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 631 | { |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 632 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Peter Meerwald | cb9b9a8 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 633 | |
| 634 | iio_device_unregister(indio_dev); |
| 635 | iio_triggered_buffer_cleanup(indio_dev); |
| 636 | |
Peter Meerwald | 094509b1 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 637 | /* sleep mode to save power */ |
Peter Meerwald | 6224875 | 2013-10-16 23:19:00 +0100 | [diff] [blame] | 638 | hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 639 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 640 | return 0; |
| 641 | } |
Josef Gajdusek | fc35a91 | 2014-07-22 16:01:00 +0100 | [diff] [blame] | 642 | EXPORT_SYMBOL(hmc5843_common_remove); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 643 | |
Sachin Kamat | b658a37 | 2013-09-05 10:29:00 +0100 | [diff] [blame] | 644 | MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com>"); |
Josef Gajdusek | 5a059bd | 2014-07-22 16:02:00 +0100 | [diff] [blame] | 645 | MODULE_DESCRIPTION("HMC5843/5883/5883L/5983 core driver"); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 646 | MODULE_LICENSE("GPL"); |