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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 | /* * STMicroelectronics pressures driver * * Copyright 2013 STMicroelectronics Inc. * * Denis Ciocca <denis.ciocca@st.com> * * Licensed under the GPL-2. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/mutex.h> #include <linux/interrupt.h> #include <linux/i2c.h> #include <linux/gpio.h> #include <linux/irq.h> #include <linux/delay.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/trigger.h> #include <linux/iio/buffer.h> #include <asm/unaligned.h> #include <linux/iio/common/st_sensors.h> #include "st_pressure.h" #define ST_PRESS_LSB_PER_MBAR 4096UL #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \ ST_PRESS_LSB_PER_MBAR) #define ST_PRESS_LSB_PER_CELSIUS 480UL #define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \ ST_PRESS_LSB_PER_CELSIUS) #define ST_PRESS_NUMBER_DATA_CHANNELS 1 /* DEFAULT VALUE FOR SENSORS */ #define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28 #define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b /* FULLSCALE */ #define ST_PRESS_FS_AVL_1260MB 1260 /* CUSTOM VALUES FOR SENSOR 1 */ #define ST_PRESS_1_WAI_EXP 0xbb #define ST_PRESS_1_ODR_ADDR 0x20 #define ST_PRESS_1_ODR_MASK 0x70 #define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01 #define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05 #define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06 #define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07 #define ST_PRESS_1_PW_ADDR 0x20 #define ST_PRESS_1_PW_MASK 0x80 #define ST_PRESS_1_FS_ADDR 0x23 #define ST_PRESS_1_FS_MASK 0x30 #define ST_PRESS_1_FS_AVL_1260_VAL 0x00 #define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE #define ST_PRESS_1_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE #define ST_PRESS_1_BDU_ADDR 0x20 #define ST_PRESS_1_BDU_MASK 0x04 #define ST_PRESS_1_DRDY_IRQ_ADDR 0x22 #define ST_PRESS_1_DRDY_IRQ_INT1_MASK 0x04 #define ST_PRESS_1_DRDY_IRQ_INT2_MASK 0x20 #define ST_PRESS_1_MULTIREAD_BIT true #define ST_PRESS_1_TEMP_OFFSET 42500 static const struct iio_chan_spec st_press_channels[] = { ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24, ST_PRESS_DEFAULT_OUT_XL_ADDR), ST_SENSORS_LSM_CHANNELS(IIO_TEMP, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16, ST_TEMP_DEFAULT_OUT_L_ADDR), IIO_CHAN_SOFT_TIMESTAMP(1) }; static const struct st_sensors st_press_sensors[] = { { .wai = ST_PRESS_1_WAI_EXP, .sensors_supported = { [0] = LPS331AP_PRESS_DEV_NAME, }, .ch = (struct iio_chan_spec *)st_press_channels, .odr = { .addr = ST_PRESS_1_ODR_ADDR, .mask = ST_PRESS_1_ODR_MASK, .odr_avl = { { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, }, { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, }, { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, }, { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, }, }, }, .pw = { .addr = ST_PRESS_1_PW_ADDR, .mask = ST_PRESS_1_PW_MASK, .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, }, .fs = { .addr = ST_PRESS_1_FS_ADDR, .mask = ST_PRESS_1_FS_MASK, .fs_avl = { [0] = { .num = ST_PRESS_FS_AVL_1260MB, .value = ST_PRESS_1_FS_AVL_1260_VAL, .gain = ST_PRESS_1_FS_AVL_1260_GAIN, .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN, }, }, }, .bdu = { .addr = ST_PRESS_1_BDU_ADDR, .mask = ST_PRESS_1_BDU_MASK, }, .drdy_irq = { .addr = ST_PRESS_1_DRDY_IRQ_ADDR, .mask_int1 = ST_PRESS_1_DRDY_IRQ_INT1_MASK, .mask_int2 = ST_PRESS_1_DRDY_IRQ_INT2_MASK, }, .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT, .bootime = 2, }, }; static int st_press_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *ch, int *val, int *val2, long mask) { int err; struct st_sensor_data *pdata = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: err = st_sensors_read_info_raw(indio_dev, ch, val); if (err < 0) goto read_error; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = 0; switch (ch->type) { case IIO_PRESSURE: *val2 = pdata->current_fullscale->gain; break; case IIO_TEMP: *val2 = pdata->current_fullscale->gain2; break; default: err = -EINVAL; goto read_error; } return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_OFFSET: switch (ch->type) { case IIO_TEMP: *val = 425; *val2 = 10; break; default: err = -EINVAL; goto read_error; } return IIO_VAL_FRACTIONAL; default: return -EINVAL; } read_error: return err; } static ST_SENSOR_DEV_ATTR_SAMP_FREQ(); static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); static struct attribute *st_press_attributes[] = { &iio_dev_attr_sampling_frequency_available.dev_attr.attr, &iio_dev_attr_sampling_frequency.dev_attr.attr, NULL, }; static const struct attribute_group st_press_attribute_group = { .attrs = st_press_attributes, }; static const struct iio_info press_info = { .driver_module = THIS_MODULE, .attrs = &st_press_attribute_group, .read_raw = &st_press_read_raw, }; #ifdef CONFIG_IIO_TRIGGER static const struct iio_trigger_ops st_press_trigger_ops = { .owner = THIS_MODULE, .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, }; #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) #else #define ST_PRESS_TRIGGER_OPS NULL #endif int st_press_common_probe(struct iio_dev *indio_dev, struct st_sensors_platform_data *plat_data) { int err; struct st_sensor_data *pdata = iio_priv(indio_dev); indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &press_info; err = st_sensors_check_device_support(indio_dev, ARRAY_SIZE(st_press_sensors), st_press_sensors); if (err < 0) goto st_press_common_probe_error; pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS; pdata->multiread_bit = pdata->sensor->multi_read_bit; indio_dev->channels = pdata->sensor->ch; indio_dev->num_channels = ARRAY_SIZE(st_press_channels); pdata->current_fullscale = (struct st_sensor_fullscale_avl *) &pdata->sensor->fs.fs_avl[0]; pdata->odr = pdata->sensor->odr.odr_avl[0].hz; if (!plat_data) plat_data = (struct st_sensors_platform_data *)&default_press_pdata; err = st_sensors_init_sensor(indio_dev, plat_data); if (err < 0) goto st_press_common_probe_error; if (pdata->get_irq_data_ready(indio_dev) > 0) { err = st_press_allocate_ring(indio_dev); if (err < 0) goto st_press_common_probe_error; err = st_sensors_allocate_trigger(indio_dev, ST_PRESS_TRIGGER_OPS); if (err < 0) goto st_press_probe_trigger_error; } err = iio_device_register(indio_dev); if (err) goto st_press_device_register_error; return err; st_press_device_register_error: if (pdata->get_irq_data_ready(indio_dev) > 0) st_sensors_deallocate_trigger(indio_dev); st_press_probe_trigger_error: if (pdata->get_irq_data_ready(indio_dev) > 0) st_press_deallocate_ring(indio_dev); st_press_common_probe_error: return err; } EXPORT_SYMBOL(st_press_common_probe); void st_press_common_remove(struct iio_dev *indio_dev) { struct st_sensor_data *pdata = iio_priv(indio_dev); iio_device_unregister(indio_dev); if (pdata->get_irq_data_ready(indio_dev) > 0) { st_sensors_deallocate_trigger(indio_dev); st_press_deallocate_ring(indio_dev); } } EXPORT_SYMBOL(st_press_common_remove); MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); MODULE_DESCRIPTION("STMicroelectronics pressures driver"); MODULE_LICENSE("GPL v2"); |