Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 1 | /* Copyright (C) 2010 Texas Instruments |
| 2 | Author: Shubhrajyoti Datta <shubhrajyoti@ti.com> |
Jonathan Cameron | 0f8c962 | 2012-09-02 21:34:59 +0100 | [diff] [blame] | 3 | Acknowledgement: Jonathan Cameron <jic23@kernel.org> for valuable inputs. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 4 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 5 | Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>. |
| 6 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/i2c.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/types.h> |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 27 | #include <linux/iio/iio.h> |
| 28 | #include <linux/iio/sysfs.h> |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 29 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 30 | #define HMC5843_CONFIG_REG_A 0x00 |
| 31 | #define HMC5843_CONFIG_REG_B 0x01 |
| 32 | #define HMC5843_MODE_REG 0x02 |
| 33 | #define HMC5843_DATA_OUT_X_MSB_REG 0x03 |
| 34 | #define HMC5843_DATA_OUT_X_LSB_REG 0x04 |
| 35 | #define HMC5843_DATA_OUT_Y_MSB_REG 0x05 |
| 36 | #define HMC5843_DATA_OUT_Y_LSB_REG 0x06 |
| 37 | #define HMC5843_DATA_OUT_Z_MSB_REG 0x07 |
| 38 | #define HMC5843_DATA_OUT_Z_LSB_REG 0x08 |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 39 | /* Beware: Y and Z are exchanged on HMC5883 */ |
| 40 | #define HMC5883_DATA_OUT_Z_MSB_REG 0x05 |
| 41 | #define HMC5883_DATA_OUT_Z_LSB_REG 0x06 |
| 42 | #define HMC5883_DATA_OUT_Y_MSB_REG 0x07 |
| 43 | #define HMC5883_DATA_OUT_Y_LSB_REG 0x08 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 44 | #define HMC5843_STATUS_REG 0x09 |
| 45 | #define HMC5843_ID_REG_A 0x0A |
| 46 | #define HMC5843_ID_REG_B 0x0B |
| 47 | #define HMC5843_ID_REG_C 0x0C |
| 48 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 49 | enum hmc5843_ids { |
| 50 | HMC5843_ID, |
| 51 | HMC5883_ID, |
| 52 | HMC5883L_ID, |
| 53 | }; |
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 | * Beware: identification of the HMC5883 is still "H43"; |
| 57 | * I2C address is also unchanged |
| 58 | */ |
| 59 | #define HMC5843_ID_REG_LENGTH 0x03 |
| 60 | #define HMC5843_ID_STRING "H43" |
| 61 | #define HMC5843_I2C_ADDRESS 0x1E |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 62 | |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 63 | /* |
| 64 | * Range gain settings in (+-)Ga |
| 65 | * Beware: HMC5843 and HMC5883 have different recommended sensor field |
| 66 | * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively |
| 67 | */ |
| 68 | #define HMC5843_RANGE_GAIN_OFFSET 0x05 |
| 69 | #define HMC5843_RANGE_GAIN_DEFAULT 0x01 |
| 70 | #define HMC5843_RANGE_GAIN_MAX 0x07 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 71 | |
| 72 | /* |
| 73 | * Device status |
| 74 | */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 75 | #define HMC5843_DATA_READY 0x01 |
| 76 | #define HMC5843_DATA_OUTPUT_LOCK 0x02 |
| 77 | /* Does not exist on HMC5883, not used */ |
| 78 | #define HMC5843_VOLTAGE_REGULATOR_ENABLED 0x04 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 79 | |
| 80 | /* |
| 81 | * Mode register configuration |
| 82 | */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 83 | #define HMC5843_MODE_CONVERSION_CONTINUOUS 0x00 |
| 84 | #define HMC5843_MODE_CONVERSION_SINGLE 0x01 |
| 85 | #define HMC5843_MODE_IDLE 0x02 |
| 86 | #define HMC5843_MODE_SLEEP 0x03 |
| 87 | #define HMC5843_MODE_MASK 0x03 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 88 | |
| 89 | /* |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 90 | * HMC5843: Minimum data output rate |
| 91 | * HMC5883: Typical data output rate |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 92 | */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 93 | #define HMC5843_RATE_OFFSET 0x02 |
| 94 | #define HMC5843_RATE_BITMASK 0x1C |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 95 | #define HMC5843_RATE_NOT_USED 0x07 |
| 96 | |
| 97 | /* |
| 98 | * Device measurement configuration |
| 99 | */ |
| 100 | #define HMC5843_MEAS_CONF_NORMAL 0x00 |
| 101 | #define HMC5843_MEAS_CONF_POSITIVE_BIAS 0x01 |
| 102 | #define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02 |
| 103 | #define HMC5843_MEAS_CONF_NOT_USED 0x03 |
| 104 | #define HMC5843_MEAS_CONF_MASK 0x03 |
| 105 | |
| 106 | /* |
| 107 | * Scaling factors: 10000000/Gain |
| 108 | */ |
| 109 | static const int hmc5843_regval_to_nanoscale[] = { |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 110 | 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 111 | }; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 112 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 113 | static const int hmc5883_regval_to_nanoscale[] = { |
| 114 | 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662 |
| 115 | }; |
| 116 | |
| 117 | static const int hmc5883l_regval_to_nanoscale[] = { |
| 118 | 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478 |
| 119 | }; |
| 120 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 121 | /* |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 122 | * From the HMC5843 datasheet: |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 123 | * Value | Sensor input field range (Ga) | Gain (counts/milli-Gauss) |
| 124 | * 0 | (+-)0.7 | 1620 |
| 125 | * 1 | (+-)1.0 | 1300 |
| 126 | * 2 | (+-)1.5 | 970 |
| 127 | * 3 | (+-)2.0 | 780 |
| 128 | * 4 | (+-)3.2 | 530 |
| 129 | * 5 | (+-)3.8 | 460 |
| 130 | * 6 | (+-)4.5 | 390 |
| 131 | * 7 | (+-)6.5 | 280 |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 132 | * |
| 133 | * From the HMC5883 datasheet: |
| 134 | * Value | Recommended sensor field range (Ga) | Gain (counts/Gauss) |
| 135 | * 0 | (+-)0.9 | 1280 |
| 136 | * 1 | (+-)1.2 | 1024 |
| 137 | * 2 | (+-)1.9 | 768 |
| 138 | * 3 | (+-)2.5 | 614 |
| 139 | * 4 | (+-)4.0 | 415 |
| 140 | * 5 | (+-)4.6 | 361 |
| 141 | * 6 | (+-)5.5 | 307 |
| 142 | * 7 | (+-)7.9 | 219 |
| 143 | * |
| 144 | * From the HMC5883L datasheet: |
| 145 | * Value | Recommended sensor field range (Ga) | Gain (LSB/Gauss) |
| 146 | * 0 | (+-)0.88 | 1370 |
| 147 | * 1 | (+-)1.3 | 1090 |
| 148 | * 2 | (+-)1.9 | 820 |
| 149 | * 3 | (+-)2.5 | 660 |
| 150 | * 4 | (+-)4.0 | 440 |
| 151 | * 5 | (+-)4.7 | 390 |
| 152 | * 6 | (+-)5.6 | 330 |
| 153 | * 7 | (+-)8.1 | 230 |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 154 | */ |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 155 | static const int hmc5843_regval_to_input_field_mga[] = { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 156 | 700, 1000, 1500, 2000, 3200, 3800, 4500, 6500 |
| 157 | }; |
| 158 | |
| 159 | static const int hmc5883_regval_to_input_field_mga[] = { |
| 160 | 900, 1200, 1900, 2500, 4000, 4600, 5500, 7900 |
| 161 | }; |
| 162 | |
| 163 | static const int hmc5883l_regval_to_input_field_mga[] = { |
| 164 | 880, 1300, 1900, 2500, 4000, 4700, 5600, 8100 |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 165 | }; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 166 | |
| 167 | /* |
| 168 | * From the datasheet: |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 169 | * Value | HMC5843 | HMC5883/HMC5883L |
| 170 | * | Data output rate (Hz) | Data output rate (Hz) |
| 171 | * 0 | 0.5 | 0.75 |
| 172 | * 1 | 1 | 1.5 |
| 173 | * 2 | 2 | 3 |
| 174 | * 3 | 5 | 7.5 |
| 175 | * 4 | 10 (default) | 15 |
| 176 | * 5 | 20 | 30 |
| 177 | * 6 | 50 | 75 |
| 178 | * 7 | Not used | Not used |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 179 | */ |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 180 | static const char * const hmc5843_regval_to_sample_freq[] = { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 181 | "0.5", "1", "2", "5", "10", "20", "50", |
| 182 | }; |
| 183 | |
| 184 | static const char * const hmc5883_regval_to_sample_freq[] = { |
| 185 | "0.75", "1.5", "3", "7.5", "15", "30", "75", |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 186 | }; |
| 187 | |
| 188 | /* Addresses to scan: 0x1E */ |
| 189 | static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS, |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 190 | I2C_CLIENT_END }; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 191 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 192 | /* Describe chip variants */ |
| 193 | struct hmc5843_chip_info { |
| 194 | const struct iio_chan_spec *channels; |
| 195 | int num_channels; |
| 196 | const char * const *regval_to_sample_freq; |
| 197 | const int *regval_to_input_field_mga; |
| 198 | const int *regval_to_nanoscale; |
| 199 | }; |
| 200 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 201 | /* Each client has this additional data */ |
| 202 | struct hmc5843_data { |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 203 | struct mutex lock; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 204 | u8 rate; |
| 205 | u8 meas_conf; |
| 206 | u8 operating_mode; |
| 207 | u8 range; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 208 | const struct hmc5843_chip_info *variant; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 209 | }; |
| 210 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 211 | /* The lower two bits contain the current conversion mode */ |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 212 | static s32 hmc5843_configure(struct i2c_client *client, |
| 213 | u8 operating_mode) |
| 214 | { |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 215 | return i2c_smbus_write_byte_data(client, |
| 216 | HMC5843_MODE_REG, |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 217 | operating_mode & HMC5843_MODE_MASK); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 218 | } |
| 219 | |
Justin P. Mattock | 4abf6f8 | 2012-02-29 22:00:38 -0800 | [diff] [blame] | 220 | /* Return the measurement value from the specified channel */ |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 221 | static int hmc5843_read_measurement(struct iio_dev *indio_dev, |
| 222 | int address, |
| 223 | int *val) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 224 | { |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 225 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 226 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 227 | s32 result; |
| 228 | |
| 229 | mutex_lock(&data->lock); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 230 | result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG); |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 231 | while (!(result & HMC5843_DATA_READY)) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 232 | result = i2c_smbus_read_byte_data(client, HMC5843_STATUS_REG); |
| 233 | |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 234 | result = i2c_smbus_read_word_data(client, address); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 235 | mutex_unlock(&data->lock); |
| 236 | if (result < 0) |
| 237 | return -EINVAL; |
| 238 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 239 | *val = (s16)swab16((u16)result); |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 240 | return IIO_VAL_INT; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 241 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 242 | |
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 | * From the datasheet: |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 245 | * 0 - Continuous-Conversion Mode: In continuous-conversion mode, the |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 246 | * device continuously performs conversions and places the result in |
| 247 | * the data register. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 248 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 249 | * 1 - Single-Conversion Mode : Device performs a single measurement, |
| 250 | * sets RDY high and returns to sleep mode. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 251 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 252 | * 2 - Idle Mode : Device is placed in idle mode. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 253 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 254 | * 3 - Sleep Mode : Device is placed in sleep mode. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 255 | * |
| 256 | */ |
| 257 | static ssize_t hmc5843_show_operating_mode(struct device *dev, |
| 258 | struct device_attribute *attr, |
| 259 | char *buf) |
| 260 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 261 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 262 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 263 | return sprintf(buf, "%d\n", data->operating_mode); |
| 264 | } |
| 265 | |
| 266 | static ssize_t hmc5843_set_operating_mode(struct device *dev, |
| 267 | struct device_attribute *attr, |
| 268 | const char *buf, |
| 269 | size_t count) |
| 270 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 271 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 272 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 273 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 274 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 275 | unsigned long operating_mode = 0; |
| 276 | s32 status; |
| 277 | int error; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 278 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 279 | mutex_lock(&data->lock); |
Peter Meerwald | d32ec55 | 2012-05-16 18:22:04 +0200 | [diff] [blame] | 280 | error = kstrtoul(buf, 10, &operating_mode); |
Julia Lawall | d1ae4da | 2010-08-04 21:54:26 +0200 | [diff] [blame] | 281 | if (error) { |
| 282 | count = error; |
| 283 | goto exit; |
| 284 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 285 | dev_dbg(dev, "set conversion mode to %lu\n", operating_mode); |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 286 | if (operating_mode > HMC5843_MODE_SLEEP) { |
Julia Lawall | d1ae4da | 2010-08-04 21:54:26 +0200 | [diff] [blame] | 287 | count = -EINVAL; |
| 288 | goto exit; |
| 289 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 290 | |
| 291 | status = i2c_smbus_write_byte_data(client, this_attr->address, |
| 292 | operating_mode); |
| 293 | if (status) { |
| 294 | count = -EINVAL; |
| 295 | goto exit; |
| 296 | } |
| 297 | data->operating_mode = operating_mode; |
| 298 | |
| 299 | exit: |
| 300 | mutex_unlock(&data->lock); |
| 301 | return count; |
| 302 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 303 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 304 | static IIO_DEVICE_ATTR(operating_mode, |
| 305 | S_IWUSR | S_IRUGO, |
| 306 | hmc5843_show_operating_mode, |
| 307 | hmc5843_set_operating_mode, |
| 308 | HMC5843_MODE_REG); |
| 309 | |
| 310 | /* |
| 311 | * API for setting the measurement configuration to |
| 312 | * Normal, Positive bias and Negative bias |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 313 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 314 | * From the datasheet: |
| 315 | * 0 - Normal measurement configuration (default): In normal measurement |
| 316 | * configuration the device follows normal measurement flow. Pins BP |
| 317 | * and BN are left floating and high impedance. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 318 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 319 | * 1 - Positive bias configuration: In positive bias configuration, a |
| 320 | * positive current is forced across the resistive load on pins BP |
| 321 | * and BN. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 322 | * |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 323 | * 2 - Negative bias configuration. In negative bias configuration, a |
| 324 | * negative current is forced across the resistive load on pins BP |
| 325 | * and BN. |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 326 | * |
| 327 | */ |
| 328 | static s32 hmc5843_set_meas_conf(struct i2c_client *client, |
| 329 | u8 meas_conf) |
| 330 | { |
Peter Meerwald | 0462e2b | 2012-05-16 18:22:03 +0200 | [diff] [blame] | 331 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 332 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 333 | u8 reg_val; |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 334 | reg_val = (meas_conf & HMC5843_MEAS_CONF_MASK) | |
| 335 | (data->rate << HMC5843_RATE_OFFSET); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 336 | return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val); |
| 337 | } |
| 338 | |
| 339 | static ssize_t hmc5843_show_measurement_configuration(struct device *dev, |
| 340 | struct device_attribute *attr, |
| 341 | char *buf) |
| 342 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 343 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 344 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 345 | return sprintf(buf, "%d\n", data->meas_conf); |
| 346 | } |
| 347 | |
| 348 | static ssize_t hmc5843_set_measurement_configuration(struct device *dev, |
| 349 | struct device_attribute *attr, |
| 350 | const char *buf, |
| 351 | size_t count) |
| 352 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 353 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 354 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
Peter Meerwald | 0462e2b | 2012-05-16 18:22:03 +0200 | [diff] [blame] | 355 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 356 | unsigned long meas_conf = 0; |
Peter Meerwald | e278df1 | 2012-05-17 02:28:09 +0200 | [diff] [blame] | 357 | int error; |
| 358 | |
| 359 | error = kstrtoul(buf, 10, &meas_conf); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 360 | if (error) |
| 361 | return error; |
Peter Meerwald | e278df1 | 2012-05-17 02:28:09 +0200 | [diff] [blame] | 362 | if (meas_conf >= HMC5843_MEAS_CONF_NOT_USED) |
| 363 | return -EINVAL; |
| 364 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 365 | mutex_lock(&data->lock); |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 366 | dev_dbg(dev, "set measurement configuration to %lu\n", meas_conf); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 367 | if (hmc5843_set_meas_conf(client, meas_conf)) { |
| 368 | count = -EINVAL; |
| 369 | goto exit; |
| 370 | } |
| 371 | data->meas_conf = meas_conf; |
| 372 | |
| 373 | exit: |
| 374 | mutex_unlock(&data->lock); |
| 375 | return count; |
| 376 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 377 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 378 | static IIO_DEVICE_ATTR(meas_conf, |
| 379 | S_IWUSR | S_IRUGO, |
| 380 | hmc5843_show_measurement_configuration, |
| 381 | hmc5843_set_measurement_configuration, |
| 382 | 0); |
| 383 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 384 | static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev, |
| 385 | struct device_attribute *attr, |
| 386 | char *buf) |
| 387 | { |
| 388 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 389 | struct hmc5843_data *data = iio_priv(indio_dev); |
| 390 | ssize_t total_n = 0; |
| 391 | int i; |
| 392 | |
| 393 | for (i = 0; i < HMC5843_RATE_NOT_USED; i++) { |
| 394 | ssize_t n = sprintf(buf, "%s ", data->variant->regval_to_sample_freq[i]); |
| 395 | buf += n; |
| 396 | total_n += n; |
| 397 | } |
| 398 | /* replace trailing space by newline */ |
| 399 | buf[-1] = '\n'; |
| 400 | |
| 401 | return total_n; |
| 402 | } |
| 403 | |
| 404 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 405 | |
| 406 | static s32 hmc5843_set_rate(struct i2c_client *client, |
| 407 | u8 rate) |
| 408 | { |
Peter Meerwald | 0462e2b | 2012-05-16 18:22:03 +0200 | [diff] [blame] | 409 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 410 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 411 | u8 reg_val; |
| 412 | |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 413 | if (rate >= HMC5843_RATE_NOT_USED) { |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 414 | dev_err(&client->dev, |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 415 | "data output rate is not supported\n"); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 416 | return -EINVAL; |
| 417 | } |
Peter Meerwald | 4fd4d7d | 2012-05-17 02:28:12 +0200 | [diff] [blame] | 418 | |
| 419 | reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 420 | return i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_A, reg_val); |
| 421 | } |
| 422 | |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 423 | static int hmc5843_check_sampling_frequency(struct hmc5843_data *data, |
| 424 | const char *buf) |
| 425 | { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 426 | const char * const *samp_freq = data->variant->regval_to_sample_freq; |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 427 | int i; |
| 428 | |
| 429 | for (i = 0; i < HMC5843_RATE_NOT_USED; i++) { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 430 | if (sysfs_streq(buf, samp_freq[i])) |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 431 | return i; |
| 432 | } |
| 433 | |
| 434 | return -EINVAL; |
| 435 | } |
| 436 | |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 437 | static ssize_t hmc5843_set_sampling_frequency(struct device *dev, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 438 | struct device_attribute *attr, |
| 439 | const char *buf, size_t count) |
| 440 | { |
| 441 | |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 442 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 443 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 444 | struct hmc5843_data *data = iio_priv(indio_dev); |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 445 | int rate; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 446 | |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 447 | rate = hmc5843_check_sampling_frequency(data, buf); |
| 448 | if (rate < 0) { |
| 449 | dev_err(&client->dev, |
| 450 | "sampling frequency is not supported\n"); |
| 451 | return rate; |
| 452 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 453 | |
| 454 | mutex_lock(&data->lock); |
Peter Meerwald | 13f6eb6 | 2012-05-17 02:28:08 +0200 | [diff] [blame] | 455 | dev_dbg(dev, "set rate to %d\n", rate); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 456 | if (hmc5843_set_rate(client, rate)) { |
| 457 | count = -EINVAL; |
| 458 | goto exit; |
| 459 | } |
| 460 | data->rate = rate; |
| 461 | |
| 462 | exit: |
| 463 | mutex_unlock(&data->lock); |
| 464 | return count; |
| 465 | } |
| 466 | |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 467 | static ssize_t hmc5843_show_sampling_frequency(struct device *dev, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 468 | struct device_attribute *attr, char *buf) |
| 469 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 470 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 471 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
| 472 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 473 | struct hmc5843_data *data = iio_priv(indio_dev); |
Dan Carpenter | 213fd22 | 2010-08-10 07:37:33 +0200 | [diff] [blame] | 474 | s32 rate; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 475 | |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 476 | rate = i2c_smbus_read_byte_data(client, this_attr->address); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 477 | if (rate < 0) |
Dan Carpenter | 213fd22 | 2010-08-10 07:37:33 +0200 | [diff] [blame] | 478 | return rate; |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 479 | rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 480 | return sprintf(buf, "%s\n", data->variant->regval_to_sample_freq[rate]); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 481 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 482 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 483 | static IIO_DEVICE_ATTR(sampling_frequency, |
| 484 | S_IWUSR | S_IRUGO, |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 485 | hmc5843_show_sampling_frequency, |
| 486 | hmc5843_set_sampling_frequency, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 487 | HMC5843_CONFIG_REG_A); |
| 488 | |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 489 | static ssize_t hmc5843_show_range_gain(struct device *dev, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 490 | struct device_attribute *attr, |
| 491 | char *buf) |
| 492 | { |
| 493 | u8 range; |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 494 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 495 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 496 | |
| 497 | range = data->range; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 498 | return sprintf(buf, "%d\n", data->variant->regval_to_input_field_mga[range]); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 499 | } |
| 500 | |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 501 | static ssize_t hmc5843_set_range_gain(struct device *dev, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 502 | struct device_attribute *attr, |
| 503 | const char *buf, |
| 504 | size_t count) |
| 505 | { |
Lars-Peter Clausen | 527cf71 | 2012-05-12 15:39:52 +0200 | [diff] [blame] | 506 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 507 | struct i2c_client *client = to_i2c_client(indio_dev->dev.parent); |
| 508 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 509 | struct hmc5843_data *data = iio_priv(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 510 | unsigned long range = 0; |
| 511 | int error; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 512 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 513 | mutex_lock(&data->lock); |
Peter Meerwald | d32ec55 | 2012-05-16 18:22:04 +0200 | [diff] [blame] | 514 | error = kstrtoul(buf, 10, &range); |
Julia Lawall | d1ae4da | 2010-08-04 21:54:26 +0200 | [diff] [blame] | 515 | if (error) { |
| 516 | count = error; |
| 517 | goto exit; |
| 518 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 519 | dev_dbg(dev, "set range to %lu\n", range); |
| 520 | |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 521 | if (range > HMC5843_RANGE_GAIN_MAX) { |
Julia Lawall | d1ae4da | 2010-08-04 21:54:26 +0200 | [diff] [blame] | 522 | count = -EINVAL; |
| 523 | goto exit; |
| 524 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 525 | |
| 526 | data->range = range; |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 527 | range = range << HMC5843_RANGE_GAIN_OFFSET; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 528 | if (i2c_smbus_write_byte_data(client, this_attr->address, range)) |
| 529 | count = -EINVAL; |
| 530 | |
Julia Lawall | d1ae4da | 2010-08-04 21:54:26 +0200 | [diff] [blame] | 531 | exit: |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 532 | mutex_unlock(&data->lock); |
| 533 | return count; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 534 | } |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 535 | |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 536 | static IIO_DEVICE_ATTR(in_magn_range, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 537 | S_IWUSR | S_IRUGO, |
Peter Meerwald | 4906a15 | 2012-05-17 02:28:11 +0200 | [diff] [blame] | 538 | hmc5843_show_range_gain, |
| 539 | hmc5843_set_range_gain, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 540 | HMC5843_CONFIG_REG_B); |
| 541 | |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 542 | static int hmc5843_read_raw(struct iio_dev *indio_dev, |
| 543 | struct iio_chan_spec const *chan, |
| 544 | int *val, int *val2, |
| 545 | long mask) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 546 | { |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 547 | struct hmc5843_data *data = iio_priv(indio_dev); |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 548 | |
| 549 | switch (mask) { |
Jonathan Cameron | 4d9948b | 2012-04-15 17:41:23 +0100 | [diff] [blame] | 550 | case IIO_CHAN_INFO_RAW: |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 551 | return hmc5843_read_measurement(indio_dev, |
| 552 | chan->address, |
| 553 | val); |
Jonathan Cameron | c8a9f80 | 2011-10-26 17:41:36 +0100 | [diff] [blame] | 554 | case IIO_CHAN_INFO_SCALE: |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 555 | *val = 0; |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 556 | *val2 = data->variant->regval_to_nanoscale[data->range]; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 557 | return IIO_VAL_INT_PLUS_NANO; |
Peter Senna Tschudin | 73327b4 | 2012-09-28 10:57:00 +0100 | [diff] [blame] | 558 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 559 | return -EINVAL; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 560 | } |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 561 | |
| 562 | #define HMC5843_CHANNEL(axis, add) \ |
| 563 | { \ |
| 564 | .type = IIO_MAGN, \ |
| 565 | .modified = 1, \ |
| 566 | .channel2 = IIO_MOD_##axis, \ |
Jonathan Cameron | b370097 | 2013-02-27 19:40:58 +0000 | [diff] [blame^] | 567 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 568 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 569 | .address = add \ |
| 570 | } |
| 571 | |
| 572 | static const struct iio_chan_spec hmc5843_channels[] = { |
| 573 | HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG), |
| 574 | HMC5843_CHANNEL(Y, HMC5843_DATA_OUT_Y_MSB_REG), |
| 575 | HMC5843_CHANNEL(Z, HMC5843_DATA_OUT_Z_MSB_REG), |
| 576 | }; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 577 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 578 | static const struct iio_chan_spec hmc5883_channels[] = { |
| 579 | HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG), |
| 580 | HMC5843_CHANNEL(Y, HMC5883_DATA_OUT_Y_MSB_REG), |
| 581 | HMC5843_CHANNEL(Z, HMC5883_DATA_OUT_Z_MSB_REG), |
| 582 | }; |
| 583 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 584 | static struct attribute *hmc5843_attributes[] = { |
| 585 | &iio_dev_attr_meas_conf.dev_attr.attr, |
| 586 | &iio_dev_attr_operating_mode.dev_attr.attr, |
| 587 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
Jonathan Cameron | 322c956 | 2011-09-14 13:01:23 +0100 | [diff] [blame] | 588 | &iio_dev_attr_in_magn_range.dev_attr.attr, |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 589 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 590 | NULL |
| 591 | }; |
| 592 | |
| 593 | static const struct attribute_group hmc5843_group = { |
| 594 | .attrs = hmc5843_attributes, |
| 595 | }; |
| 596 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 597 | static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = { |
| 598 | [HMC5843_ID] = { |
| 599 | .channels = hmc5843_channels, |
| 600 | .num_channels = ARRAY_SIZE(hmc5843_channels), |
| 601 | .regval_to_sample_freq = hmc5843_regval_to_sample_freq, |
| 602 | .regval_to_input_field_mga = |
| 603 | hmc5843_regval_to_input_field_mga, |
| 604 | .regval_to_nanoscale = hmc5843_regval_to_nanoscale, |
| 605 | }, |
| 606 | [HMC5883_ID] = { |
| 607 | .channels = hmc5883_channels, |
| 608 | .num_channels = ARRAY_SIZE(hmc5883_channels), |
| 609 | .regval_to_sample_freq = hmc5883_regval_to_sample_freq, |
| 610 | .regval_to_input_field_mga = |
| 611 | hmc5883_regval_to_input_field_mga, |
| 612 | .regval_to_nanoscale = hmc5883_regval_to_nanoscale, |
| 613 | }, |
| 614 | [HMC5883L_ID] = { |
| 615 | .channels = hmc5883_channels, |
| 616 | .num_channels = ARRAY_SIZE(hmc5883_channels), |
| 617 | .regval_to_sample_freq = hmc5883_regval_to_sample_freq, |
| 618 | .regval_to_input_field_mga = |
| 619 | hmc5883l_regval_to_input_field_mga, |
| 620 | .regval_to_nanoscale = hmc5883l_regval_to_nanoscale, |
| 621 | }, |
| 622 | }; |
| 623 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 624 | static int hmc5843_detect(struct i2c_client *client, |
| 625 | struct i2c_board_info *info) |
| 626 | { |
| 627 | unsigned char id_str[HMC5843_ID_REG_LENGTH]; |
| 628 | |
| 629 | if (client->addr != HMC5843_I2C_ADDRESS) |
| 630 | return -ENODEV; |
| 631 | |
| 632 | if (i2c_smbus_read_i2c_block_data(client, HMC5843_ID_REG_A, |
| 633 | HMC5843_ID_REG_LENGTH, id_str) |
| 634 | != HMC5843_ID_REG_LENGTH) |
| 635 | return -ENODEV; |
| 636 | |
| 637 | if (0 != strncmp(id_str, HMC5843_ID_STRING, HMC5843_ID_REG_LENGTH)) |
| 638 | return -ENODEV; |
| 639 | |
| 640 | return 0; |
| 641 | } |
| 642 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 643 | /* Called when we have found a new HMC58X3 */ |
| 644 | static void hmc5843_init_client(struct i2c_client *client, |
| 645 | const struct i2c_device_id *id) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 646 | { |
Marek Belisko | 62d2feb | 2012-04-12 21:48:03 +0200 | [diff] [blame] | 647 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 648 | struct hmc5843_data *data = iio_priv(indio_dev); |
| 649 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 650 | data->variant = &hmc5843_chip_info_tbl[id->driver_data]; |
| 651 | indio_dev->channels = data->variant->channels; |
| 652 | indio_dev->num_channels = data->variant->num_channels; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 653 | hmc5843_set_meas_conf(client, data->meas_conf); |
| 654 | hmc5843_set_rate(client, data->rate); |
| 655 | hmc5843_configure(client, data->operating_mode); |
| 656 | i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range); |
| 657 | mutex_init(&data->lock); |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 658 | |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 659 | pr_info("%s initialized\n", id->name); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 660 | } |
| 661 | |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 662 | static const struct iio_info hmc5843_info = { |
| 663 | .attrs = &hmc5843_group, |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 664 | .read_raw = &hmc5843_read_raw, |
Jonathan Cameron | 6fe8135 | 2011-05-18 14:42:37 +0100 | [diff] [blame] | 665 | .driver_module = THIS_MODULE, |
| 666 | }; |
| 667 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 668 | static int hmc5843_probe(struct i2c_client *client, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 669 | const struct i2c_device_id *id) |
| 670 | { |
| 671 | struct hmc5843_data *data; |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 672 | struct iio_dev *indio_dev; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 673 | int err = 0; |
| 674 | |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 675 | indio_dev = iio_device_alloc(sizeof(*data)); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 676 | if (indio_dev == NULL) { |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 677 | err = -ENOMEM; |
| 678 | goto exit; |
| 679 | } |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 680 | |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 681 | /* default settings at probe */ |
| 682 | data = iio_priv(indio_dev); |
| 683 | data->meas_conf = HMC5843_MEAS_CONF_NORMAL; |
| 684 | data->range = HMC5843_RANGE_GAIN_DEFAULT; |
| 685 | data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS; |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 686 | |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 687 | i2c_set_clientdata(client, indio_dev); |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 688 | hmc5843_init_client(client, id); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 689 | |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 690 | indio_dev->info = &hmc5843_info; |
Jonathan Cameron | 494c6b1 | 2011-08-12 17:47:58 +0100 | [diff] [blame] | 691 | indio_dev->name = id->name; |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 692 | indio_dev->dev.parent = &client->dev; |
| 693 | indio_dev->modes = INDIO_DIRECT_MODE; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 694 | |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 695 | err = iio_device_register(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 696 | if (err) |
| 697 | goto exit_free2; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 698 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 699 | return 0; |
Peter Meerwald | c7c34af | 2012-05-17 02:28:10 +0200 | [diff] [blame] | 700 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 701 | exit_free2: |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 702 | iio_device_free(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 703 | exit: |
| 704 | return err; |
| 705 | } |
| 706 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 707 | static int hmc5843_remove(struct i2c_client *client) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 708 | { |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 709 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
Jonathan Cameron | d2fffd6 | 2011-10-14 14:46:58 +0100 | [diff] [blame] | 710 | |
| 711 | iio_device_unregister(indio_dev); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 712 | /* sleep mode to save power */ |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 713 | hmc5843_configure(client, HMC5843_MODE_SLEEP); |
Lars-Peter Clausen | 7cbb753 | 2012-04-26 13:35:01 +0200 | [diff] [blame] | 714 | iio_device_free(indio_dev); |
Jonathan Cameron | 88fa4de | 2011-06-27 13:07:56 +0100 | [diff] [blame] | 715 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 716 | return 0; |
| 717 | } |
| 718 | |
Lars-Peter Clausen | 01788c5 | 2012-02-20 19:37:05 +0100 | [diff] [blame] | 719 | #ifdef CONFIG_PM_SLEEP |
| 720 | static int hmc5843_suspend(struct device *dev) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 721 | { |
Peter Meerwald | 16b91a4 | 2012-05-16 18:22:05 +0200 | [diff] [blame] | 722 | hmc5843_configure(to_i2c_client(dev), HMC5843_MODE_SLEEP); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 723 | return 0; |
| 724 | } |
| 725 | |
Lars-Peter Clausen | 01788c5 | 2012-02-20 19:37:05 +0100 | [diff] [blame] | 726 | static int hmc5843_resume(struct device *dev) |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 727 | { |
Peter Meerwald | 0462e2b | 2012-05-16 18:22:03 +0200 | [diff] [blame] | 728 | struct i2c_client *client = to_i2c_client(dev); |
| 729 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 730 | struct hmc5843_data *data = iio_priv(indio_dev); |
| 731 | |
| 732 | hmc5843_configure(client, data->operating_mode); |
| 733 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 734 | return 0; |
| 735 | } |
| 736 | |
Lars-Peter Clausen | 01788c5 | 2012-02-20 19:37:05 +0100 | [diff] [blame] | 737 | static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops, hmc5843_suspend, hmc5843_resume); |
| 738 | #define HMC5843_PM_OPS (&hmc5843_pm_ops) |
| 739 | #else |
| 740 | #define HMC5843_PM_OPS NULL |
| 741 | #endif |
| 742 | |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 743 | static const struct i2c_device_id hmc5843_id[] = { |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 744 | { "hmc5843", HMC5843_ID }, |
| 745 | { "hmc5883", HMC5883_ID }, |
| 746 | { "hmc5883l", HMC5883L_ID }, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 747 | { } |
| 748 | }; |
Lars-Peter Clausen | 55e4390 | 2011-11-16 08:53:31 +0100 | [diff] [blame] | 749 | MODULE_DEVICE_TABLE(i2c, hmc5843_id); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 750 | |
| 751 | static struct i2c_driver hmc5843_driver = { |
| 752 | .driver = { |
| 753 | .name = "hmc5843", |
Lars-Peter Clausen | 01788c5 | 2012-02-20 19:37:05 +0100 | [diff] [blame] | 754 | .pm = HMC5843_PM_OPS, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 755 | }, |
| 756 | .id_table = hmc5843_id, |
| 757 | .probe = hmc5843_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 758 | .remove = hmc5843_remove, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 759 | .detect = hmc5843_detect, |
| 760 | .address_list = normal_i2c, |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 761 | }; |
Lars-Peter Clausen | 6e5af18 | 2011-11-16 10:13:38 +0100 | [diff] [blame] | 762 | module_i2c_driver(hmc5843_driver); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 763 | |
| 764 | MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com"); |
Peter Meerwald | 357fcff | 2012-05-17 02:28:13 +0200 | [diff] [blame] | 765 | MODULE_DESCRIPTION("HMC5843/5883/5883L driver"); |
Shubhrajyoti D | b4e1782 | 2010-07-17 18:32:52 +0530 | [diff] [blame] | 766 | MODULE_LICENSE("GPL"); |