linux-dev - Linux kernel development work

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Diffstat (limited to 'include/linux/sysdev.h')

0 files changed, 0 insertions, 0 deletions

/* * ADIS16201 Programmable Digital Vibration Sensor driver * * Copyright 2010 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #include <linux/delay.h> #include <linux/mutex.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/module.h> #include "../iio.h" #include "../sysfs.h" #include "../buffer_generic.h" #include "adis16201.h" enum adis16201_chan { in_supply, temp, accel_x, accel_y, incli_x, incli_y, in_aux, }; /** * adis16201_spi_write_reg_8() - write single byte to a register * @dev: device associated with child of actual device (iio_dev or iio_trig) * @reg_address: the address of the register to be written * @val: the value to write **/ static int adis16201_spi_write_reg_8(struct iio_dev *indio_dev, u8 reg_address, u8 val) { int ret; struct adis16201_state *st = iio_priv(indio_dev); mutex_lock(&st->buf_lock); st->tx[0] = ADIS16201_WRITE_REG(reg_address); st->tx[1] = val; ret = spi_write(st->us, st->tx, 2); mutex_unlock(&st->buf_lock); return ret; } /** * adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers * @indio_dev: iio device associated with child of actual device * @reg_address: the address of the lower of the two registers. Second register * is assumed to have address one greater. * @val: value to be written **/ static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev, u8 lower_reg_address, u16 value) { int ret; struct spi_message msg; struct adis16201_state *st = iio_priv(indio_dev); struct spi_transfer xfers[] = { { .tx_buf = st->tx, .bits_per_word = 8, .len = 2, .cs_change = 1, }, { .tx_buf = st->tx + 2, .bits_per_word = 8, .len = 2, }, }; mutex_lock(&st->buf_lock); st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address); st->tx[1] = value & 0xFF; st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1); st->tx[3] = (value >> 8) & 0xFF; spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); spi_message_add_tail(&xfers[1], &msg); ret = spi_sync(st->us, &msg); mutex_unlock(&st->buf_lock); return ret; } /** * adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register * @indio_dev: iio device associated with child of actual device * @reg_address: the address of the lower of the two registers. Second register * is assumed to have address one greater. * @val: somewhere to pass back the value read **/ static int adis16201_spi_read_reg_16(struct iio_dev *indio_dev, u8 lower_reg_address, u16 *val) { struct spi_message msg; struct adis16201_state *st = iio_priv(indio_dev); int ret; struct spi_transfer xfers[] = { { .tx_buf = st->tx, .bits_per_word = 8, .len = 2, .cs_change = 1, .delay_usecs = 20, }, { .rx_buf = st->rx, .bits_per_word = 8, .len = 2, .delay_usecs = 20, }, }; mutex_lock(&st->buf_lock); st->tx[0] = ADIS16201_READ_REG(lower_reg_address); st->tx[1] = 0; spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); spi_message_add_tail(&xfers[1], &msg); ret = spi_sync(st->us, &msg); if (ret) { dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X", lower_reg_address); goto error_ret; } *val = (st->rx[0] << 8) | st->rx[1]; error_ret: mutex_unlock(&st->buf_lock); return ret; } static int adis16201_reset(struct iio_dev *indio_dev) { int ret; struct adis16201_state *st = iio_priv(indio_dev); ret = adis16201_spi_write_reg_8(indio_dev, ADIS16201_GLOB_CMD, ADIS16201_GLOB_CMD_SW_RESET); if (ret) dev_err(&st->us->dev, "problem resetting device"); return ret; } static ssize_t adis16201_write_reset(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { int ret; bool res; if (len < 1) return -EINVAL; ret = strtobool(buf, &res); if (ret || !res) return ret; return adis16201_reset(dev_get_drvdata(dev)); } int adis16201_set_irq(struct iio_dev *indio_dev, bool enable) { int ret = 0; u16 msc; ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc); if (ret) goto error_ret; msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH; msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1; if (enable) msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN; else msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN; ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc); error_ret: return ret; } static int adis16201_check_status(struct iio_dev *indio_dev) { u16 status; int ret; ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_DIAG_STAT, &status); if (ret < 0) { dev_err(&indio_dev->dev, "Reading status failed\n"); goto error_ret; } ret = status & 0xF; if (ret) ret = -EFAULT; if (status & ADIS16201_DIAG_STAT_SPI_FAIL) dev_err(&indio_dev->dev, "SPI failure\n"); if (status & ADIS16201_DIAG_STAT_FLASH_UPT) dev_err(&indio_dev->dev, "Flash update failed\n"); if (status & ADIS16201_DIAG_STAT_POWER_HIGH) dev_err(&indio_dev->dev, "Power supply above 3.625V\n"); if (status & ADIS16201_DIAG_STAT_POWER_LOW) dev_err(&indio_dev->dev, "Power supply below 3.15V\n"); error_ret: return ret; } static int adis16201_self_test(struct iio_dev *indio_dev) { int ret; ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, ADIS16201_MSC_CTRL_SELF_TEST_EN); if (ret) { dev_err(&indio_dev->dev, "problem starting self test"); goto err_ret; } ret = adis16201_check_status(indio_dev); err_ret: return ret; } static int adis16201_initial_setup(struct iio_dev *indio_dev) { int ret; struct device *dev = &indio_dev->dev; /* Disable IRQ */ ret = adis16201_set_irq(indio_dev, false); if (ret) { dev_err(dev, "disable irq failed"); goto err_ret; } /* Do self test */ ret = adis16201_self_test(indio_dev); if (ret) { dev_err(dev, "self test failure"); goto err_ret; } /* Read status register to check the result */ ret = adis16201_check_status(indio_dev); if (ret) { adis16201_reset(indio_dev); dev_err(dev, "device not playing ball -> reset"); msleep(ADIS16201_STARTUP_DELAY); ret = adis16201_check_status(indio_dev); if (ret) { dev_err(dev, "giving up"); goto err_ret; } } err_ret: return ret; } static u8 adis16201_addresses[7][2] = { [in_supply] = { ADIS16201_SUPPLY_OUT, }, [temp] = { ADIS16201_TEMP_OUT }, [accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS }, [accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS }, [in_aux] = { ADIS16201_AUX_ADC }, [incli_x] = { ADIS16201_XINCL_OUT }, [incli_y] = { ADIS16201_YINCL_OUT }, }; static int adis16201_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { int ret; int bits; u8 addr; s16 val16; switch (mask) { case 0: mutex_lock(&indio_dev->mlock); addr = adis16201_addresses[chan->address][0]; ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16); if (ret) { mutex_unlock(&indio_dev->mlock); return ret; } if (val16 & ADIS16201_ERROR_ACTIVE) { ret = adis16201_check_status(indio_dev); if (ret) { mutex_unlock(&indio_dev->mlock); return ret; } } val16 = val16 & ((1 << chan->scan_type.realbits) - 1); if (chan->scan_type.sign == 's') val16 = (s16)(val16 << (16 - chan->scan_type.realbits)) >> (16 - chan->scan_type.realbits); *val = val16; mutex_unlock(&indio_dev->mlock); return IIO_VAL_INT; case (1 << IIO_CHAN_INFO_SCALE_SEPARATE): case (1 << IIO_CHAN_INFO_SCALE_SHARED): switch (chan->type) { case IIO_VOLTAGE: *val = 0; if (chan->channel == 0) *val2 = 1220; else *val2 = 610; return IIO_VAL_INT_PLUS_MICRO; case IIO_TEMP: *val = 0; *val2 = -470000; return IIO_VAL_INT_PLUS_MICRO; case IIO_ACCEL: *val = 0; *val2 = 462500; return IIO_VAL_INT_PLUS_MICRO; case IIO_INCLI: *val = 0; *val2 = 100000; return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } break; case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE): *val = 25; return IIO_VAL_INT; case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE): switch (chan->type) { case IIO_ACCEL: bits = 12; break; case IIO_INCLI: bits = 9; break; default: return -EINVAL; }; mutex_lock(&indio_dev->mlock); addr = adis16201_addresses[chan->address][1]; ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16); if (ret) { mutex_unlock(&indio_dev->mlock); return ret; } val16 &= (1 << bits) - 1; val16 = (s16)(val16 << (16 - bits)) >> (16 - bits); *val = val16; mutex_unlock(&indio_dev->mlock); return IIO_VAL_INT; } return -EINVAL; } static int adis16201_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { int bits; s16 val16; u8 addr; switch (mask) { case (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE): switch (chan->type) { case IIO_ACCEL: bits = 12; break; case IIO_INCLI: bits = 9; break; default: return -EINVAL; }; val16 = val & ((1 << bits) - 1); addr = adis16201_addresses[chan->address][1]; return adis16201_spi_write_reg_16(indio_dev, addr, val16); } return -EINVAL; } static struct iio_chan_spec adis16201_channels[] = { IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, "supply", 0, 0, (1 << IIO_CHAN_INFO_SCALE_SEPARATE), in_supply, ADIS16201_SCAN_SUPPLY, IIO_ST('u', 12, 16, 0), 0), IIO_CHAN(IIO_TEMP, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SEPARATE) | (1 << IIO_CHAN_INFO_OFFSET_SEPARATE), temp, ADIS16201_SCAN_TEMP, IIO_ST('u', 12, 16, 0), 0), IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X, (1 << IIO_CHAN_INFO_SCALE_SHARED) | (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE), accel_x, ADIS16201_SCAN_ACC_X, IIO_ST('s', 14, 16, 0), 0), IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y, (1 << IIO_CHAN_INFO_SCALE_SHARED) | (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE), accel_y, ADIS16201_SCAN_ACC_Y, IIO_ST('s', 14, 16, 0), 0), IIO_CHAN(IIO_VOLTAGE, 0, 1, 0, NULL, 1, 0, (1 << IIO_CHAN_INFO_SCALE_SEPARATE), in_aux, ADIS16201_SCAN_AUX_ADC, IIO_ST('u', 12, 16, 0), 0), IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_X, (1 << IIO_CHAN_INFO_SCALE_SHARED) | (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE), incli_x, ADIS16201_SCAN_INCLI_X, IIO_ST('s', 14, 16, 0), 0), IIO_CHAN(IIO_INCLI, 1, 0, 0, NULL, 0, IIO_MOD_Y, (1 << IIO_CHAN_INFO_SCALE_SHARED) | (1 << IIO_CHAN_INFO_CALIBBIAS_SEPARATE), incli_y, ADIS16201_SCAN_INCLI_Y, IIO_ST('s', 14, 16, 0), 0), IIO_CHAN_SOFT_TIMESTAMP(7) }; static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16201_write_reset, 0); static struct attribute *adis16201_attributes[] = { &iio_dev_attr_reset.dev_attr.attr, NULL }; static const struct attribute_group adis16201_attribute_group = { .attrs = adis16201_attributes, }; static const struct iio_info adis16201_info = { .attrs = &adis16201_attribute_group, .read_raw = &adis16201_read_raw, .write_raw = &adis16201_write_raw, .driver_module = THIS_MODULE, }; static int __devinit adis16201_probe(struct spi_device *spi) { int ret; struct adis16201_state *st; struct iio_dev *indio_dev; /* setup the industrialio driver allocated elements */ indio_dev = iio_allocate_device(sizeof(*st)); if (indio_dev == NULL) { ret = -ENOMEM; goto error_ret; } st = iio_priv(indio_dev); /* this is only used for removal purposes */ spi_set_drvdata(spi, indio_dev); st->us = spi; mutex_init(&st->buf_lock); indio_dev->name = spi->dev.driver->name; indio_dev->dev.parent = &spi->dev; indio_dev->info = &adis16201_info; indio_dev->channels = adis16201_channels; indio_dev->num_channels = ARRAY_SIZE(adis16201_channels); indio_dev->modes = INDIO_DIRECT_MODE; ret = adis16201_configure_ring(indio_dev); if (ret) goto error_free_dev; ret = iio_buffer_register(indio_dev, adis16201_channels, ARRAY_SIZE(adis16201_channels)); if (ret) { printk(KERN_ERR "failed to initialize the ring\n"); goto error_unreg_ring_funcs; } if (spi->irq) { ret = adis16201_probe_trigger(indio_dev); if (ret) goto error_uninitialize_ring; } /* Get the device into a sane initial state */ ret = adis16201_initial_setup(indio_dev); if (ret) goto error_remove_trigger; ret = iio_device_register(indio_dev); if (ret < 0) goto error_remove_trigger; return 0; error_remove_trigger: adis16201_remove_trigger(indio_dev); error_uninitialize_ring: iio_buffer_unregister(indio_dev); error_unreg_ring_funcs: adis16201_unconfigure_ring(indio_dev); error_free_dev: iio_free_device(indio_dev); error_ret: return ret; } static int adis16201_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); adis16201_remove_trigger(indio_dev); iio_buffer_unregister(indio_dev); adis16201_unconfigure_ring(indio_dev); iio_device_unregister(indio_dev); return 0; } static struct spi_driver adis16201_driver = { .driver = { .name = "adis16201", .owner = THIS_MODULE, }, .probe = adis16201_probe, .remove = __devexit_p(adis16201_remove), }; static __init int adis16201_init(void) { return spi_register_driver(&adis16201_driver); } module_init(adis16201_init); static __exit void adis16201_exit(void) { spi_unregister_driver(&adis16201_driver); } module_exit(adis16201_exit); MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver"); MODULE_LICENSE("GPL v2");


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