/* * kxsd9.c simple support for the Kionix KXSD9 3D * accelerometer. * * Copyright (c) 2008-2009 Jonathan Cameron * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * The i2c interface is very similar, so shouldn't be a problem once * I have a suitable wire made up. * * TODO: Support the motion detector */ #include #include #include #include #include #include #include #include #include #include #include #include "kxsd9.h" #define KXSD9_REG_X 0x00 #define KXSD9_REG_Y 0x02 #define KXSD9_REG_Z 0x04 #define KXSD9_REG_AUX 0x06 #define KXSD9_REG_RESET 0x0a #define KXSD9_REG_CTRL_C 0x0c #define KXSD9_FS_MASK 0x03 #define KXSD9_REG_CTRL_B 0x0d #define KXSD9_REG_CTRL_A 0x0e /** * struct kxsd9_state - device related storage * @dev: pointer to the parent device * @map: regmap to the device */ struct kxsd9_state { struct device *dev; struct regmap *map; }; #define KXSD9_SCALE_2G "0.011978" #define KXSD9_SCALE_4G "0.023927" #define KXSD9_SCALE_6G "0.035934" #define KXSD9_SCALE_8G "0.047853" /* reverse order */ static const int kxsd9_micro_scales[4] = { 47853, 35934, 23927, 11978 }; #define KXSD9_ZERO_G_OFFSET -2048 static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro) { int ret, i; struct kxsd9_state *st = iio_priv(indio_dev); bool foundit = false; unsigned int val; for (i = 0; i < 4; i++) if (micro == kxsd9_micro_scales[i]) { foundit = true; break; } if (!foundit) return -EINVAL; ret = regmap_read(st->map, KXSD9_REG_CTRL_C, &val); if (ret < 0) goto error_ret; ret = regmap_write(st->map, KXSD9_REG_CTRL_C, (val & ~KXSD9_FS_MASK) | i); error_ret: return ret; } static IIO_CONST_ATTR(accel_scale_available, KXSD9_SCALE_2G " " KXSD9_SCALE_4G " " KXSD9_SCALE_6G " " KXSD9_SCALE_8G); static struct attribute *kxsd9_attributes[] = { &iio_const_attr_accel_scale_available.dev_attr.attr, NULL, }; static int kxsd9_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { int ret = -EINVAL; if (mask == IIO_CHAN_INFO_SCALE) { /* Check no integer component */ if (val) return -EINVAL; ret = kxsd9_write_scale(indio_dev, val2); } return ret; } static int kxsd9_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { int ret = -EINVAL; struct kxsd9_state *st = iio_priv(indio_dev); unsigned int regval; __be16 raw_val; u16 nval; switch (mask) { case IIO_CHAN_INFO_RAW: ret = regmap_bulk_read(st->map, chan->address, &raw_val, sizeof(raw_val)); if (ret) goto error_ret; nval = be16_to_cpu(raw_val); /* Only 12 bits are valid */ nval >>= 4; *val = nval; ret = IIO_VAL_INT; break; case IIO_CHAN_INFO_OFFSET: /* This has a bias of -2048 */ *val = KXSD9_ZERO_G_OFFSET; ret = IIO_VAL_INT; break; case IIO_CHAN_INFO_SCALE: ret = regmap_read(st->map, KXSD9_REG_CTRL_C, ®val); if (ret < 0) goto error_ret; *val = 0; *val2 = kxsd9_micro_scales[regval & KXSD9_FS_MASK]; ret = IIO_VAL_INT_PLUS_MICRO; break; } error_ret: return ret; }; static irqreturn_t kxsd9_trigger_handler(int irq, void *p) { const struct iio_poll_func *pf = p; struct iio_dev *indio_dev = pf->indio_dev; struct kxsd9_state *st = iio_priv(indio_dev); int ret; /* 4 * 16bit values AND timestamp */ __be16 hw_values[8]; ret = regmap_bulk_read(st->map, KXSD9_REG_X, &hw_values, 8); if (ret) { dev_err(st->dev, "error reading data\n"); return ret; } iio_push_to_buffers_with_timestamp(indio_dev, hw_values, iio_get_time_ns(indio_dev)); iio_trigger_notify_done(indio_dev->trig); return IRQ_HANDLED; } #define KXSD9_ACCEL_CHAN(axis, index) \ { \ .type = IIO_ACCEL, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_OFFSET), \ .address = KXSD9_REG_##axis, \ .scan_index = index, \ .scan_type = { \ .sign = 'u', \ .realbits = 12, \ .storagebits = 16, \ .shift = 4, \ .endianness = IIO_BE, \ }, \ } static const struct iio_chan_spec kxsd9_channels[] = { KXSD9_ACCEL_CHAN(X, 0), KXSD9_ACCEL_CHAN(Y, 1), KXSD9_ACCEL_CHAN(Z, 2), { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .indexed = 1, .address = KXSD9_REG_AUX, .scan_index = 3, .scan_type = { .sign = 'u', .realbits = 12, .storagebits = 16, .shift = 4, .endianness = IIO_BE, }, }, IIO_CHAN_SOFT_TIMESTAMP(4), }; static const struct attribute_group kxsd9_attribute_group = { .attrs = kxsd9_attributes, }; static int kxsd9_power_up(struct kxsd9_state *st) { int ret; ret = regmap_write(st->map, KXSD9_REG_CTRL_B, 0x40); if (ret) return ret; return regmap_write(st->map, KXSD9_REG_CTRL_C, 0x9b); }; static const struct iio_info kxsd9_info = { .read_raw = &kxsd9_read_raw, .write_raw = &kxsd9_write_raw, .attrs = &kxsd9_attribute_group, .driver_module = THIS_MODULE, }; /* Four channels apart from timestamp, scan mask = 0x0f */ static const unsigned long kxsd9_scan_masks[] = { 0xf, 0 }; int kxsd9_common_probe(struct device *parent, struct regmap *map, const char *name) { struct iio_dev *indio_dev; struct kxsd9_state *st; int ret; indio_dev = devm_iio_device_alloc(parent, sizeof(*st)); if (!indio_dev) return -ENOMEM; st = iio_priv(indio_dev); st->dev = parent; st->map = map; indio_dev->channels = kxsd9_channels; indio_dev->num_channels = ARRAY_SIZE(kxsd9_channels); indio_dev->name = name; indio_dev->dev.parent = parent; indio_dev->info = &kxsd9_info; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->available_scan_masks = kxsd9_scan_masks; kxsd9_power_up(st); ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time, kxsd9_trigger_handler, NULL); if (ret) { dev_err(parent, "triggered buffer setup failed\n"); return ret; } ret = iio_device_register(indio_dev); if (ret) goto err_cleanup_buffer; dev_set_drvdata(parent, indio_dev); return 0; err_cleanup_buffer: iio_triggered_buffer_cleanup(indio_dev); return ret; } EXPORT_SYMBOL(kxsd9_common_probe); int kxsd9_common_remove(struct device *parent) { struct iio_dev *indio_dev = dev_get_drvdata(parent); iio_triggered_buffer_cleanup(indio_dev); iio_device_unregister(indio_dev); return 0; } EXPORT_SYMBOL(kxsd9_common_remove); MODULE_AUTHOR("Jonathan Cameron "); MODULE_DESCRIPTION("Kionix KXSD9 driver"); MODULE_LICENSE("GPL v2");