staging: IIO: DAC: New driver for the AD5504 and AD55041 High Voltage DACs
authorMichael Hennerich <michael.hennerich@analog.com>
Mon, 4 Apr 2011 13:39:15 +0000 (15:39 +0200)
committerGreg Kroah-Hartman <gregkh@suse.de>
Tue, 5 Apr 2011 19:10:59 +0000 (12:10 -0700)
Changes since V1:

IIO: DAC: Apply review feedback from Jonathan

Fix array size and declare const.
Fix reversed dacY_powerdown read back.
Use individual attribute groups instead of is_visible.
Fix event naming and add the _en file.

Changes since V2:

IIO: DAC: AD5504 use proper event type

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/staging/iio/dac/Kconfig
drivers/staging/iio/dac/Makefile
drivers/staging/iio/dac/ad5504.c [new file with mode: 0644]
drivers/staging/iio/dac/ad5504.h [new file with mode: 0644]
drivers/staging/iio/sysfs.h

index 67defcb359b126e34ac7d8613ee079f767fa0bb2..1b0188a2c559c59c3663ab128d4d739d79d8928e 100644 (file)
@@ -21,6 +21,16 @@ config AD5446
          To compile this driver as a module, choose M here: the
          module will be called ad5446.
 
+config AD5504
+       tristate "Analog Devices AD5504/AD5501 DAC SPI driver"
+       depends on SPI
+       help
+         Say yes here to build support for Analog Devices AD5504, AD5501,
+         High Voltage Digital to Analog Converter.
+
+         To compile this driver as a module, choose M here: the
+         module will be called ad5504.
+
 config MAX517
        tristate "Maxim MAX517/518/519 DAC driver"
        depends on I2C && EXPERIMENTAL
index 1197aef54abbf2234b2c065df6437617f8bdf13e..020df4a1130aec91588eedd60c674a3a50b0d867 100644 (file)
@@ -3,5 +3,6 @@
 #
 
 obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
+obj-$(CONFIG_AD5504) += ad5504.o
 obj-$(CONFIG_AD5446) += ad5446.o
 obj-$(CONFIG_MAX517) += max517.o
diff --git a/drivers/staging/iio/dac/ad5504.c b/drivers/staging/iio/dac/ad5504.c
new file mode 100644 (file)
index 0000000..153c36e
--- /dev/null
@@ -0,0 +1,426 @@
+/*
+ * 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");
diff --git a/drivers/staging/iio/dac/ad5504.h b/drivers/staging/iio/dac/ad5504.h
new file mode 100644 (file)
index 0000000..d2fac63
--- /dev/null
@@ -0,0 +1,74 @@
+/*
+ * AD5504 SPI DAC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef SPI_AD5504_H_
+#define SPI_AD5504_H_
+
+#define AD5505_BITS                    12
+#define AD5504_RES_MASK                        ((1 << (AD5505_BITS)) - 1)
+
+#define AD5504_CMD_READ                        (1 << 15)
+#define AD5504_CMD_WRITE               (0 << 15)
+#define AD5504_ADDR(addr)              ((addr) << 12)
+
+/* Registers */
+#define AD5504_ADDR_NOOP               0
+#define AD5504_ADDR_DAC0               1
+#define AD5504_ADDR_DAC1               2
+#define AD5504_ADDR_DAC2               3
+#define AD5504_ADDR_DAC3               4
+#define AD5504_ADDR_ALL_DAC            5
+#define AD5504_ADDR_CTRL               7
+
+/* Control Register */
+#define AD5504_DAC_PWR(ch)             ((ch) << 2)
+#define AD5504_DAC_PWRDWN_MODE(mode)   ((mode) << 6)
+#define AD5504_DAC_PWRDN_20K           0
+#define AD5504_DAC_PWRDN_3STATE                1
+
+/*
+ * TODO: struct ad5504_platform_data needs to go into include/linux/iio
+ */
+
+struct ad5504_platform_data {
+       u16                             vref_mv;
+};
+
+/**
+ * struct ad5446_state - driver instance specific data
+ * @indio_dev:         the industrial I/O device
+ * @us:                        spi_device
+ * @reg:               supply regulator
+ * @vref_mv:           actual reference voltage used
+ * @work_alarm:                bh work structure for event handling
+ * @last_timestamp:    timestamp of last event interrupt
+ * @pwr_down_mask      power down mask
+ * @pwr_down_mode      current power down mode
+ */
+
+struct ad5504_state {
+       struct iio_dev                  *indio_dev;
+       struct spi_device               *spi;
+       struct regulator                *reg;
+       unsigned short                  vref_mv;
+       struct work_struct              work_alarm;
+       s64                             last_timestamp;
+       unsigned                        pwr_down_mask;
+       unsigned                        pwr_down_mode;
+};
+
+/**
+ * ad5504_supported_device_ids:
+ */
+
+enum ad5504_supported_device_ids {
+       ID_AD5504,
+       ID_AD5501,
+};
+
+#endif /* SPI_AD5504_H_ */
index 24b74ddcd0830ffcc6bb31424b63648ee89df13d..8f4d5474c0938fc68b8d3d0cfbd7ca05eb1c1417 100644 (file)
@@ -266,6 +266,7 @@ struct iio_const_attr {
 #define IIO_EV_CLASS_MAGN              4
 #define IIO_EV_CLASS_LIGHT             5
 #define IIO_EV_CLASS_PROXIMITY         6
+#define IIO_EV_CLASS_TEMP              7
 
 #define IIO_EV_MOD_X                   0
 #define IIO_EV_MOD_Y                   1