| /* |
| * AD5504, AD5501 High Voltage Digital to Analog Converter |
| * |
| * Copyright 2011 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2. |
| */ |
| |
| #include <linux/interrupt.h> |
| #include <linux/fs.h> |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/spi/spi.h> |
| #include <linux/slab.h> |
| #include <linux/sysfs.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/module.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "dac.h" |
| #include "ad5504.h" |
| |
| static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val) |
| { |
| u16 tmp = cpu_to_be16(AD5504_CMD_WRITE | |
| AD5504_ADDR(addr) | |
| (val & AD5504_RES_MASK)); |
| |
| return spi_write(spi, (u8 *)&tmp, 2); |
| } |
| |
| static int ad5504_spi_read(struct spi_device *spi, u8 addr, u16 *val) |
| { |
| u16 tmp = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr)); |
| int ret; |
| struct spi_transfer t = { |
| .tx_buf = &tmp, |
| .rx_buf = val, |
| .len = 2, |
| }; |
| struct spi_message m; |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| ret = spi_sync(spi, &m); |
| |
| *val = be16_to_cpu(*val) & AD5504_RES_MASK; |
| |
| return ret; |
| } |
| |
| static ssize_t ad5504_write_dac(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| long readin; |
| int ret; |
| |
| ret = strict_strtol(buf, 10, &readin); |
| if (ret) |
| return ret; |
| |
| ret = ad5504_spi_write(st->spi, this_attr->address, readin); |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5504_read_dac(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| u16 val; |
| |
| ret = ad5504_spi_read(st->spi, this_attr->address, &val); |
| if (ret) |
| return ret; |
| |
| return sprintf(buf, "%d\n", val); |
| } |
| |
| static ssize_t ad5504_read_powerdown_mode(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| |
| const char mode[][14] = {"20kohm_to_gnd", "three_state"}; |
| |
| return sprintf(buf, "%s\n", mode[st->pwr_down_mode]); |
| } |
| |
| static ssize_t ad5504_write_powerdown_mode(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| if (sysfs_streq(buf, "20kohm_to_gnd")) |
| st->pwr_down_mode = AD5504_DAC_PWRDN_20K; |
| else if (sysfs_streq(buf, "three_state")) |
| st->pwr_down_mode = AD5504_DAC_PWRDN_3STATE; |
| else |
| ret = -EINVAL; |
| |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5504_read_dac_powerdown(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| return sprintf(buf, "%d\n", |
| !(st->pwr_down_mask & (1 << this_attr->address))); |
| } |
| |
| static ssize_t ad5504_write_dac_powerdown(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| long readin; |
| int ret; |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| |
| ret = strict_strtol(buf, 10, &readin); |
| if (ret) |
| return ret; |
| |
| if (readin == 0) |
| st->pwr_down_mask |= (1 << this_attr->address); |
| else if (readin == 1) |
| st->pwr_down_mask &= ~(1 << this_attr->address); |
| else |
| ret = -EINVAL; |
| |
| ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL, |
| AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) | |
| AD5504_DAC_PWR(st->pwr_down_mask)); |
| |
| /* writes to the CTRL register must be followed by a NOOP */ |
| ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0); |
| |
| return ret ? ret : len; |
| } |
| |
| static ssize_t ad5504_show_scale(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| /* Corresponds to Vref / 2^(bits) */ |
| unsigned int scale_uv = (st->vref_mv * 1000) >> AD5505_BITS; |
| |
| return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); |
| } |
| static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5504_show_scale, NULL, 0); |
| |
| #define IIO_DEV_ATTR_OUT_RW_RAW(_num, _show, _store, _addr) \ |
| IIO_DEVICE_ATTR(out_voltage##_num##_raw, \ |
| S_IRUGO | S_IWUSR, _show, _store, _addr) |
| |
| static IIO_DEV_ATTR_OUT_RW_RAW(0, ad5504_read_dac, |
| ad5504_write_dac, AD5504_ADDR_DAC0); |
| static IIO_DEV_ATTR_OUT_RW_RAW(1, ad5504_read_dac, |
| ad5504_write_dac, AD5504_ADDR_DAC1); |
| static IIO_DEV_ATTR_OUT_RW_RAW(2, ad5504_read_dac, |
| ad5504_write_dac, AD5504_ADDR_DAC2); |
| static IIO_DEV_ATTR_OUT_RW_RAW(3, ad5504_read_dac, |
| ad5504_write_dac, AD5504_ADDR_DAC3); |
| |
| static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO | |
| S_IWUSR, ad5504_read_powerdown_mode, |
| ad5504_write_powerdown_mode, 0); |
| |
| static IIO_CONST_ATTR(out_voltage_powerdown_mode_available, |
| "20kohm_to_gnd three_state"); |
| |
| #define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \ |
| IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \ |
| S_IRUGO | S_IWUSR, _show, _store, _addr) |
| static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5504_read_dac_powerdown, |
| ad5504_write_dac_powerdown, 0); |
| static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5504_read_dac_powerdown, |
| ad5504_write_dac_powerdown, 1); |
| static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5504_read_dac_powerdown, |
| ad5504_write_dac_powerdown, 2); |
| static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5504_read_dac_powerdown, |
| ad5504_write_dac_powerdown, 3); |
| |
| static struct attribute *ad5504_attributes[] = { |
| &iio_dev_attr_out_voltage0_raw.dev_attr.attr, |
| &iio_dev_attr_out_voltage1_raw.dev_attr.attr, |
| &iio_dev_attr_out_voltage2_raw.dev_attr.attr, |
| &iio_dev_attr_out_voltage3_raw.dev_attr.attr, |
| &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr, |
| &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr, |
| &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr, |
| &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr, |
| &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr, |
| &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr, |
| &iio_dev_attr_out_voltage_scale.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ad5504_attribute_group = { |
| .attrs = ad5504_attributes, |
| }; |
| |
| static struct attribute *ad5501_attributes[] = { |
| &iio_dev_attr_out_voltage0_raw.dev_attr.attr, |
| &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr, |
| &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr, |
| &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr, |
| &iio_dev_attr_out_voltage_scale.dev_attr.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group ad5501_attribute_group = { |
| .attrs = ad5501_attributes, |
| }; |
| |
| static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000"); |
| static IIO_CONST_ATTR(temp0_thresh_rising_en, "1"); |
| |
| static struct attribute *ad5504_ev_attributes[] = { |
| &iio_const_attr_temp0_thresh_rising_value.dev_attr.attr, |
| &iio_const_attr_temp0_thresh_rising_en.dev_attr.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group ad5504_ev_attribute_group = { |
| .attrs = ad5504_ev_attributes, |
| .name = "events", |
| }; |
| |
| static irqreturn_t ad5504_event_handler(int irq, void *private) |
| { |
| iio_push_event(private, |
| IIO_UNMOD_EVENT_CODE(IIO_TEMP, |
| 0, |
| IIO_EV_TYPE_THRESH, |
| IIO_EV_DIR_RISING), |
| iio_get_time_ns()); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static const struct iio_info ad5504_info = { |
| .attrs = &ad5504_attribute_group, |
| .event_attrs = &ad5504_ev_attribute_group, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const struct iio_info ad5501_info = { |
| .attrs = &ad5501_attribute_group, |
| .event_attrs = &ad5504_ev_attribute_group, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static int __devinit ad5504_probe(struct spi_device *spi) |
| { |
| struct ad5504_platform_data *pdata = spi->dev.platform_data; |
| struct iio_dev *indio_dev; |
| struct ad5504_state *st; |
| struct regulator *reg; |
| int ret, voltage_uv = 0; |
| |
| indio_dev = iio_allocate_device(sizeof(*st)); |
| if (indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| reg = regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(reg)) { |
| ret = regulator_enable(reg); |
| if (ret) |
| goto error_put_reg; |
| |
| voltage_uv = regulator_get_voltage(reg); |
| } |
| |
| spi_set_drvdata(spi, indio_dev); |
| st = iio_priv(indio_dev); |
| if (voltage_uv) |
| st->vref_mv = voltage_uv / 1000; |
| else if (pdata) |
| st->vref_mv = pdata->vref_mv; |
| else |
| dev_warn(&spi->dev, "reference voltage unspecified\n"); |
| |
| st->reg = reg; |
| st->spi = spi; |
| indio_dev->dev.parent = &spi->dev; |
| indio_dev->name = spi_get_device_id(st->spi)->name; |
| if (spi_get_device_id(st->spi)->driver_data == ID_AD5501) |
| indio_dev->info = &ad5501_info; |
| else |
| indio_dev->info = &ad5504_info; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| if (spi->irq) { |
| ret = request_threaded_irq(spi->irq, |
| NULL, |
| &ad5504_event_handler, |
| IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| spi_get_device_id(st->spi)->name, |
| indio_dev); |
| if (ret) |
| goto error_disable_reg; |
| } |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto error_free_irq; |
| |
| return 0; |
| |
| error_free_irq: |
| free_irq(spi->irq, indio_dev); |
| error_disable_reg: |
| if (!IS_ERR(reg)) |
| regulator_disable(reg); |
| error_put_reg: |
| if (!IS_ERR(reg)) |
| regulator_put(reg); |
| |
| iio_free_device(indio_dev); |
| error_ret: |
| return ret; |
| } |
| |
| static int __devexit ad5504_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| struct ad5504_state *st = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| if (spi->irq) |
| free_irq(spi->irq, indio_dev); |
| |
| if (!IS_ERR(st->reg)) { |
| regulator_disable(st->reg); |
| regulator_put(st->reg); |
| } |
| iio_free_device(indio_dev); |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad5504_id[] = { |
| {"ad5504", ID_AD5504}, |
| {"ad5501", ID_AD5501}, |
| {} |
| }; |
| |
| static struct spi_driver ad5504_driver = { |
| .driver = { |
| .name = "ad5504", |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad5504_probe, |
| .remove = __devexit_p(ad5504_remove), |
| .id_table = ad5504_id, |
| }; |
| |
| static __init int ad5504_spi_init(void) |
| { |
| return spi_register_driver(&ad5504_driver); |
| } |
| module_init(ad5504_spi_init); |
| |
| static __exit void ad5504_spi_exit(void) |
| { |
| spi_unregister_driver(&ad5504_driver); |
| } |
| module_exit(ad5504_spi_exit); |
| |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC"); |
| MODULE_LICENSE("GPL v2"); |