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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 15:46:39 +07:00
dbdc025bb2
The IIO DAC drivers are in a reasonably good shape. They all make use of channel spec and non of them provides non-documented sysfs attributes. Code style should be OK as well, both checkpatch and coccicheck only report trivial issues. So lets move the whole folder out of staging. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
394 lines
8.8 KiB
C
394 lines
8.8 KiB
C
/*
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* AD5504, AD5501 High Voltage Digital to Analog Converter
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/regulator/consumer.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/dac/ad5504.h>
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#define AD5505_BITS 12
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#define AD5504_RES_MASK ((1 << (AD5505_BITS)) - 1)
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#define AD5504_CMD_READ (1 << 15)
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#define AD5504_CMD_WRITE (0 << 15)
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#define AD5504_ADDR(addr) ((addr) << 12)
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/* Registers */
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#define AD5504_ADDR_NOOP 0
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#define AD5504_ADDR_DAC(x) ((x) + 1)
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#define AD5504_ADDR_ALL_DAC 5
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#define AD5504_ADDR_CTRL 7
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/* Control Register */
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#define AD5504_DAC_PWR(ch) ((ch) << 2)
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#define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
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#define AD5504_DAC_PWRDN_20K 0
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#define AD5504_DAC_PWRDN_3STATE 1
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/**
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* struct ad5446_state - driver instance specific data
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* @us: spi_device
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* @reg: supply regulator
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* @vref_mv: actual reference voltage used
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* @pwr_down_mask power down mask
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* @pwr_down_mode current power down mode
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*/
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struct ad5504_state {
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struct spi_device *spi;
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struct regulator *reg;
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unsigned short vref_mv;
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unsigned pwr_down_mask;
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unsigned pwr_down_mode;
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};
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/**
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* ad5504_supported_device_ids:
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*/
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enum ad5504_supported_device_ids {
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ID_AD5504,
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ID_AD5501,
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};
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static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
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{
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u16 tmp = cpu_to_be16(AD5504_CMD_WRITE |
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AD5504_ADDR(addr) |
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(val & AD5504_RES_MASK));
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return spi_write(spi, (u8 *)&tmp, 2);
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}
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static int ad5504_spi_read(struct spi_device *spi, u8 addr)
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{
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u16 tmp = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
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u16 val;
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int ret;
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struct spi_transfer t = {
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.tx_buf = &tmp,
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.rx_buf = &val,
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.len = 2,
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};
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struct spi_message m;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(spi, &m);
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if (ret < 0)
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return ret;
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return be16_to_cpu(val) & AD5504_RES_MASK;
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}
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static int ad5504_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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struct ad5504_state *st = iio_priv(indio_dev);
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unsigned long scale_uv;
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int ret;
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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ret = ad5504_spi_read(st->spi, chan->address);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
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*val = scale_uv / 1000;
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*val2 = (scale_uv % 1000) * 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int ad5504_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct ad5504_state *st = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (val >= (1 << chan->scan_type.realbits) || val < 0)
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return -EINVAL;
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return ad5504_spi_write(st->spi, chan->address, val);
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default:
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ret = -EINVAL;
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}
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return -EINVAL;
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}
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static const char * const ad5504_powerdown_modes[] = {
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"20kohm_to_gnd",
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"three_state",
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};
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static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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struct ad5504_state *st = iio_priv(indio_dev);
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return st->pwr_down_mode;
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}
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static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, unsigned int mode)
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{
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struct ad5504_state *st = iio_priv(indio_dev);
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st->pwr_down_mode = mode;
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return 0;
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}
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static const struct iio_enum ad5504_powerdown_mode_enum = {
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.items = ad5504_powerdown_modes,
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.num_items = ARRAY_SIZE(ad5504_powerdown_modes),
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.get = ad5504_get_powerdown_mode,
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.set = ad5504_set_powerdown_mode,
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};
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static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev,
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uintptr_t private, const struct iio_chan_spec *chan, char *buf)
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{
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struct ad5504_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%d\n",
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!(st->pwr_down_mask & (1 << chan->channel)));
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}
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static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
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uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
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size_t len)
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{
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bool pwr_down;
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int ret;
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struct ad5504_state *st = iio_priv(indio_dev);
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ret = strtobool(buf, &pwr_down);
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if (ret)
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return ret;
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if (pwr_down)
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st->pwr_down_mask |= (1 << chan->channel);
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else
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st->pwr_down_mask &= ~(1 << chan->channel);
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ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL,
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AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
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AD5504_DAC_PWR(st->pwr_down_mask));
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/* writes to the CTRL register must be followed by a NOOP */
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ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0);
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return ret ? ret : len;
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}
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static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
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static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
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static struct attribute *ad5504_ev_attributes[] = {
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&iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
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&iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
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NULL,
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};
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static struct attribute_group ad5504_ev_attribute_group = {
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.attrs = ad5504_ev_attributes,
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.name = "events",
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};
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static irqreturn_t ad5504_event_handler(int irq, void *private)
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{
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iio_push_event(private,
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IIO_UNMOD_EVENT_CODE(IIO_TEMP,
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0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns());
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return IRQ_HANDLED;
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}
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static const struct iio_info ad5504_info = {
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.write_raw = ad5504_write_raw,
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.read_raw = ad5504_read_raw,
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.event_attrs = &ad5504_ev_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
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{
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.name = "powerdown",
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.read = ad5504_read_dac_powerdown,
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.write = ad5504_write_dac_powerdown,
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},
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IIO_ENUM("powerdown_mode", true, &ad5504_powerdown_mode_enum),
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
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{ },
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};
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#define AD5504_CHANNEL(_chan) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.output = 1, \
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.channel = (_chan), \
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.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
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IIO_CHAN_INFO_SCALE_SHARED_BIT, \
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.address = AD5504_ADDR_DAC(_chan), \
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.scan_type = IIO_ST('u', 12, 16, 0), \
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.ext_info = ad5504_ext_info, \
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}
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static const struct iio_chan_spec ad5504_channels[] = {
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AD5504_CHANNEL(0),
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AD5504_CHANNEL(1),
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AD5504_CHANNEL(2),
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AD5504_CHANNEL(3),
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};
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static int __devinit ad5504_probe(struct spi_device *spi)
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{
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struct ad5504_platform_data *pdata = spi->dev.platform_data;
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struct iio_dev *indio_dev;
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struct ad5504_state *st;
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struct regulator *reg;
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int ret, voltage_uv = 0;
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indio_dev = iio_device_alloc(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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reg = regulator_get(&spi->dev, "vcc");
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if (!IS_ERR(reg)) {
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ret = regulator_enable(reg);
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if (ret)
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goto error_put_reg;
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voltage_uv = regulator_get_voltage(reg);
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}
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spi_set_drvdata(spi, indio_dev);
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st = iio_priv(indio_dev);
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else if (pdata)
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st->vref_mv = pdata->vref_mv;
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else
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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st->reg = reg;
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st->spi = spi;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->name = spi_get_device_id(st->spi)->name;
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indio_dev->info = &ad5504_info;
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if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
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indio_dev->num_channels = 1;
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else
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indio_dev->num_channels = 4;
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indio_dev->channels = ad5504_channels;
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indio_dev->modes = INDIO_DIRECT_MODE;
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if (spi->irq) {
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ret = request_threaded_irq(spi->irq,
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NULL,
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&ad5504_event_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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spi_get_device_id(st->spi)->name,
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indio_dev);
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if (ret)
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goto error_disable_reg;
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}
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_free_irq;
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return 0;
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error_free_irq:
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if (spi->irq)
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free_irq(spi->irq, indio_dev);
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error_disable_reg:
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if (!IS_ERR(reg))
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regulator_disable(reg);
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error_put_reg:
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if (!IS_ERR(reg))
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regulator_put(reg);
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iio_device_free(indio_dev);
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error_ret:
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return ret;
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}
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static int __devexit ad5504_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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struct ad5504_state *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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if (spi->irq)
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free_irq(spi->irq, indio_dev);
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if (!IS_ERR(st->reg)) {
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regulator_disable(st->reg);
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regulator_put(st->reg);
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}
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iio_device_free(indio_dev);
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return 0;
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}
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static const struct spi_device_id ad5504_id[] = {
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{"ad5504", ID_AD5504},
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{"ad5501", ID_AD5501},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad5504_id);
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static struct spi_driver ad5504_driver = {
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.driver = {
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.name = "ad5504",
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.owner = THIS_MODULE,
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},
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.probe = ad5504_probe,
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.remove = __devexit_p(ad5504_remove),
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.id_table = ad5504_id,
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};
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module_spi_driver(ad5504_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
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MODULE_LICENSE("GPL v2");
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