--- /dev/null
+/*
+ * AD5504, AD5501 High Voltage Digital to Analog Converter
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.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 "../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_dev_get_devdata(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_dev_get_devdata(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_dev_get_devdata(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_dev_get_devdata(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_dev_get_devdata(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_dev_get_devdata(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_dev_get_devdata(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_scale, S_IRUGO, ad5504_show_scale, NULL, 0);
+
+static ssize_t ad5504_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad5504_state *st = iio_dev_get_devdata(indio_dev);
+
+ return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
+}
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad5504_show_name, NULL, 0);
+
+#define IIO_DEV_ATTR_OUT_RW_RAW(_num, _show, _store, _addr) \
+ IIO_DEVICE_ATTR(out##_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_powerdown_mode, S_IRUGO |
+ S_IWUSR, ad5504_read_powerdown_mode,
+ ad5504_write_powerdown_mode, 0);
+
+static IIO_CONST_ATTR(out_powerdown_mode_available,
+ "20kohm_to_gnd three_state");
+
+#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
+ IIO_DEVICE_ATTR(out##_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_out0_raw.dev_attr.attr,
+ &iio_dev_attr_out1_raw.dev_attr.attr,
+ &iio_dev_attr_out2_raw.dev_attr.attr,
+ &iio_dev_attr_out3_raw.dev_attr.attr,
+ &iio_dev_attr_out0_powerdown.dev_attr.attr,
+ &iio_dev_attr_out1_powerdown.dev_attr.attr,
+ &iio_dev_attr_out2_powerdown.dev_attr.attr,
+ &iio_dev_attr_out3_powerdown.dev_attr.attr,
+ &iio_dev_attr_out_powerdown_mode.dev_attr.attr,
+ &iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
+ &iio_dev_attr_out_scale.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad5504_attribute_group = {
+ .attrs = ad5504_attributes,
+};
+
+static struct attribute *ad5501_attributes[] = {
+ &iio_dev_attr_out0_raw.dev_attr.attr,
+ &iio_dev_attr_out0_powerdown.dev_attr.attr,
+ &iio_dev_attr_out_powerdown_mode.dev_attr.attr,
+ &iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
+ &iio_dev_attr_out_scale.dev_attr.attr,
+ &iio_dev_attr_name.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,
+};
+
+static void ad5504_interrupt_bh(struct work_struct *work_s)
+{
+ struct ad5504_state *st = container_of(work_s,
+ struct ad5504_state, work_alarm);
+
+ iio_push_event(st->indio_dev, 0,
+ IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_TEMP,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ st->last_timestamp);
+
+ enable_irq(st->spi->irq);
+}
+
+static int ad5504_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct ad5504_state *st = dev_info->dev_data;
+
+ st->last_timestamp = timestamp;
+ schedule_work(&st->work_alarm);
+ return 0;
+}
+
+IIO_EVENT_SH(ad5504, &ad5504_interrupt);
+
+static int __devinit ad5504_probe(struct spi_device *spi)
+{
+ struct ad5504_platform_data *pdata = spi->dev.platform_data;
+ struct ad5504_state *st;
+ int ret, voltage_uv = 0;
+
+ st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ spi_set_drvdata(spi, st);
+
+ st->reg = regulator_get(&spi->dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ goto error_put_reg;
+
+ voltage_uv = regulator_get_voltage(st->reg);
+ }
+
+ 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->spi = spi;
+ st->indio_dev = iio_allocate_device();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_disable_reg;
+ }
+ st->indio_dev->dev.parent = &spi->dev;
+
+ st->indio_dev->attrs = spi_get_device_id(st->spi)->driver_data
+ == ID_AD5501 ? &ad5501_attribute_group :
+ &ad5504_attribute_group;
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+ st->indio_dev->num_interrupt_lines = 1;
+ st->indio_dev->event_attrs = &ad5504_ev_attribute_group,
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ if (spi->irq) {
+ INIT_WORK(&st->work_alarm, ad5504_interrupt_bh);
+
+ ret = iio_register_interrupt_line(spi->irq,
+ st->indio_dev,
+ 0,
+ IRQF_TRIGGER_FALLING,
+ spi_get_device_id(st->spi)->name);
+ if (ret)
+ goto error_unreg_iio_device;
+
+ iio_add_event_to_list(&iio_event_ad5504,
+ &st->indio_dev->interrupts[0]->ev_list);
+ }
+
+ return 0;
+
+error_unreg_iio_device:
+ iio_device_unregister(st->indio_dev);
+error_free_dev:
+ iio_free_device(st->indio_dev);
+error_disable_reg:
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+error_put_reg:
+ if (!IS_ERR(st->reg))
+ regulator_put(st->reg);
+
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad5504_remove(struct spi_device *spi)
+{
+ struct ad5504_state *st = spi_get_drvdata(spi);
+
+ if (spi->irq)
+ iio_unregister_interrupt_line(st->indio_dev, 0);
+
+ iio_device_unregister(st->indio_dev);
+
+ if (!IS_ERR(st->reg)) {
+ regulator_disable(st->reg);
+ regulator_put(st->reg);
+ }
+
+ kfree(st);
+
+ 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");
projects / openwrt / staging / blogic.git / commitdiff