751 lines
19 KiB
C
751 lines
19 KiB
C
/*
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* ad2s1210.c support for the ADI Resolver to Digital Converters: AD2S1210
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*
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* Copyright (c) 2010-2010 Analog Devices Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/device.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/delay.h>
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#include <linux/gpio.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 "ad2s1210.h"
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#define DRV_NAME "ad2s1210"
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#define AD2S1210_DEF_CONTROL 0x7E
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#define AD2S1210_MSB_IS_HIGH 0x80
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#define AD2S1210_MSB_IS_LOW 0x7F
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#define AD2S1210_PHASE_LOCK_RANGE_44 0x20
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#define AD2S1210_ENABLE_HYSTERESIS 0x10
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#define AD2S1210_SET_ENRES1 0x08
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#define AD2S1210_SET_ENRES0 0x04
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#define AD2S1210_SET_RES1 0x02
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#define AD2S1210_SET_RES0 0x01
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#define AD2S1210_SET_ENRESOLUTION (AD2S1210_SET_ENRES1 | \
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AD2S1210_SET_ENRES0)
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#define AD2S1210_SET_RESOLUTION (AD2S1210_SET_RES1 | AD2S1210_SET_RES0)
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#define AD2S1210_REG_POSITION 0x80
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#define AD2S1210_REG_VELOCITY 0x82
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#define AD2S1210_REG_LOS_THRD 0x88
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#define AD2S1210_REG_DOS_OVR_THRD 0x89
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#define AD2S1210_REG_DOS_MIS_THRD 0x8A
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#define AD2S1210_REG_DOS_RST_MAX_THRD 0x8B
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#define AD2S1210_REG_DOS_RST_MIN_THRD 0x8C
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#define AD2S1210_REG_LOT_HIGH_THRD 0x8D
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#define AD2S1210_REG_LOT_LOW_THRD 0x8E
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#define AD2S1210_REG_EXCIT_FREQ 0x91
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#define AD2S1210_REG_CONTROL 0x92
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#define AD2S1210_REG_SOFT_RESET 0xF0
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#define AD2S1210_REG_FAULT 0xFF
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/* pin SAMPLE, A0, A1, RES0, RES1, is controlled by driver */
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#define AD2S1210_SAA 3
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#define AD2S1210_PN (AD2S1210_SAA + AD2S1210_RES)
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#define AD2S1210_MIN_CLKIN 6144000
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#define AD2S1210_MAX_CLKIN 10240000
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#define AD2S1210_MIN_EXCIT 2000
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#define AD2S1210_MAX_EXCIT 20000
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#define AD2S1210_MIN_FCW 0x4
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#define AD2S1210_MAX_FCW 0x50
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/* default input clock on serial interface */
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#define AD2S1210_DEF_CLKIN 8192000
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/* clock period in nano second */
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#define AD2S1210_DEF_TCK (1000000000 / AD2S1210_DEF_CLKIN)
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#define AD2S1210_DEF_EXCIT 10000
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enum ad2s1210_mode {
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MOD_POS = 0,
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MOD_VEL,
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MOD_CONFIG,
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MOD_RESERVED,
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};
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static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
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struct ad2s1210_state {
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const struct ad2s1210_platform_data *pdata;
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struct mutex lock;
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struct spi_device *sdev;
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unsigned int fclkin;
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unsigned int fexcit;
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bool hysteresis;
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bool old_data;
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u8 resolution;
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enum ad2s1210_mode mode;
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u8 rx[2] ____cacheline_aligned;
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u8 tx[2] ____cacheline_aligned;
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};
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static const int ad2s1210_mode_vals[4][2] = {
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[MOD_POS] = { 0, 0 },
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[MOD_VEL] = { 0, 1 },
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[MOD_CONFIG] = { 1, 0 },
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};
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static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
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struct ad2s1210_state *st)
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{
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gpio_set_value(st->pdata->a[0], ad2s1210_mode_vals[mode][0]);
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gpio_set_value(st->pdata->a[1], ad2s1210_mode_vals[mode][1]);
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st->mode = mode;
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}
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/* write 1 bytes (address or data) to the chip */
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static int ad2s1210_config_write(struct ad2s1210_state *st, u8 data)
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{
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int ret;
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ad2s1210_set_mode(MOD_CONFIG, st);
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st->tx[0] = data;
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ret = spi_write(st->sdev, st->tx, 1);
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if (ret < 0)
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return ret;
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st->old_data = true;
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return 0;
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}
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/* read value from one of the registers */
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static int ad2s1210_config_read(struct ad2s1210_state *st,
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unsigned char address)
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{
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struct spi_transfer xfer = {
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.len = 2,
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.rx_buf = st->rx,
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.tx_buf = st->tx,
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};
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int ret = 0;
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ad2s1210_set_mode(MOD_CONFIG, st);
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st->tx[0] = address | AD2S1210_MSB_IS_HIGH;
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st->tx[1] = AD2S1210_REG_FAULT;
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ret = spi_sync_transfer(st->sdev, &xfer, 1);
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if (ret < 0)
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return ret;
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st->old_data = true;
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return st->rx[1];
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}
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static inline
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int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
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{
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int ret;
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unsigned char fcw;
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fcw = (unsigned char)(st->fexcit * (1 << 15) / st->fclkin);
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if (fcw < AD2S1210_MIN_FCW || fcw > AD2S1210_MAX_FCW) {
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dev_err(&st->sdev->dev, "ad2s1210: FCW out of range\n");
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return -ERANGE;
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}
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ret = ad2s1210_config_write(st, AD2S1210_REG_EXCIT_FREQ);
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if (ret < 0)
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return ret;
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return ad2s1210_config_write(st, fcw);
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}
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static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st)
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{
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return ad2s1210_resolution_value[
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(gpio_get_value(st->pdata->res[0]) << 1) |
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gpio_get_value(st->pdata->res[1])];
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}
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static const int ad2s1210_res_pins[4][2] = {
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{ 0, 0 }, {0, 1}, {1, 0}, {1, 1}
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};
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static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st)
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{
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gpio_set_value(st->pdata->res[0],
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ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
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gpio_set_value(st->pdata->res[1],
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ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
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}
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static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
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{
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int ret;
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ret = ad2s1210_config_write(st, AD2S1210_REG_SOFT_RESET);
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if (ret < 0)
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return ret;
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return ad2s1210_config_write(st, 0x0);
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}
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static ssize_t ad2s1210_show_fclkin(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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return sprintf(buf, "%u\n", st->fclkin);
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}
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static ssize_t ad2s1210_store_fclkin(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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unsigned int fclkin;
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int ret;
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ret = kstrtouint(buf, 10, &fclkin);
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if (ret)
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return ret;
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if (fclkin < AD2S1210_MIN_CLKIN || fclkin > AD2S1210_MAX_CLKIN) {
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dev_err(dev, "ad2s1210: fclkin out of range\n");
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return -EINVAL;
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}
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mutex_lock(&st->lock);
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st->fclkin = fclkin;
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ret = ad2s1210_update_frequency_control_word(st);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_soft_reset(st);
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error_ret:
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : len;
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}
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static ssize_t ad2s1210_show_fexcit(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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return sprintf(buf, "%u\n", st->fexcit);
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}
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static ssize_t ad2s1210_store_fexcit(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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unsigned int fexcit;
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int ret;
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ret = kstrtouint(buf, 10, &fexcit);
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if (ret < 0)
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return ret;
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if (fexcit < AD2S1210_MIN_EXCIT || fexcit > AD2S1210_MAX_EXCIT) {
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dev_err(dev,
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"ad2s1210: excitation frequency out of range\n");
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return -EINVAL;
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}
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mutex_lock(&st->lock);
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st->fexcit = fexcit;
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ret = ad2s1210_update_frequency_control_word(st);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_soft_reset(st);
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error_ret:
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : len;
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}
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static ssize_t ad2s1210_show_control(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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int ret;
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mutex_lock(&st->lock);
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ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : sprintf(buf, "0x%x\n", ret);
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}
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static ssize_t ad2s1210_store_control(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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unsigned char udata;
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unsigned char data;
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int ret;
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ret = kstrtou8(buf, 16, &udata);
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if (ret)
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return -EINVAL;
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mutex_lock(&st->lock);
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ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
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if (ret < 0)
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goto error_ret;
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data = udata & AD2S1210_MSB_IS_LOW;
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ret = ad2s1210_config_write(st, data);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
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if (ret < 0)
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goto error_ret;
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if (ret & AD2S1210_MSB_IS_HIGH) {
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ret = -EIO;
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dev_err(dev,
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"ad2s1210: write control register fail\n");
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goto error_ret;
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}
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st->resolution
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= ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
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if (st->pdata->gpioin) {
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data = ad2s1210_read_resolution_pin(st);
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if (data != st->resolution)
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dev_warn(dev, "ad2s1210: resolution settings not match\n");
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} else {
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ad2s1210_set_resolution_pin(st);
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}
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ret = len;
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st->hysteresis = !!(data & AD2S1210_ENABLE_HYSTERESIS);
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error_ret:
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mutex_unlock(&st->lock);
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return ret;
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}
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static ssize_t ad2s1210_show_resolution(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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return sprintf(buf, "%d\n", st->resolution);
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}
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static ssize_t ad2s1210_store_resolution(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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unsigned char data;
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unsigned char udata;
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int ret;
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ret = kstrtou8(buf, 10, &udata);
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if (ret || udata < 10 || udata > 16) {
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dev_err(dev, "ad2s1210: resolution out of range\n");
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return -EINVAL;
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}
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mutex_lock(&st->lock);
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ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
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if (ret < 0)
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goto error_ret;
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data = ret;
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data &= ~AD2S1210_SET_RESOLUTION;
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data |= (udata - 10) >> 1;
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ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
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if (ret < 0)
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goto error_ret;
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data = ret;
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if (data & AD2S1210_MSB_IS_HIGH) {
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ret = -EIO;
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dev_err(dev, "ad2s1210: setting resolution fail\n");
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goto error_ret;
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}
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st->resolution
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= ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
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if (st->pdata->gpioin) {
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data = ad2s1210_read_resolution_pin(st);
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if (data != st->resolution)
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dev_warn(dev, "ad2s1210: resolution settings not match\n");
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} else {
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ad2s1210_set_resolution_pin(st);
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}
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ret = len;
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error_ret:
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mutex_unlock(&st->lock);
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return ret;
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}
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/* read the fault register since last sample */
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static ssize_t ad2s1210_show_fault(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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int ret;
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mutex_lock(&st->lock);
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ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
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mutex_unlock(&st->lock);
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return ret ? ret : sprintf(buf, "0x%x\n", ret);
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}
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static ssize_t ad2s1210_clear_fault(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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int ret;
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mutex_lock(&st->lock);
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gpio_set_value(st->pdata->sample, 0);
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/* delay (2 * tck + 20) nano seconds */
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udelay(1);
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gpio_set_value(st->pdata->sample, 1);
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ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
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if (ret < 0)
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goto error_ret;
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gpio_set_value(st->pdata->sample, 0);
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gpio_set_value(st->pdata->sample, 1);
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error_ret:
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : len;
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}
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static ssize_t ad2s1210_show_reg(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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struct iio_dev_attr *iattr = to_iio_dev_attr(attr);
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int ret;
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mutex_lock(&st->lock);
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ret = ad2s1210_config_read(st, iattr->address);
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : sprintf(buf, "%d\n", ret);
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}
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static ssize_t ad2s1210_store_reg(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
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unsigned char data;
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int ret;
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struct iio_dev_attr *iattr = to_iio_dev_attr(attr);
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ret = kstrtou8(buf, 10, &data);
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if (ret)
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return -EINVAL;
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mutex_lock(&st->lock);
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ret = ad2s1210_config_write(st, iattr->address);
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if (ret < 0)
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goto error_ret;
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ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW);
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error_ret:
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mutex_unlock(&st->lock);
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return ret < 0 ? ret : len;
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}
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static int ad2s1210_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 ad2s1210_state *st = iio_priv(indio_dev);
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u16 negative;
|
|
int ret = 0;
|
|
u16 pos;
|
|
s16 vel;
|
|
|
|
mutex_lock(&st->lock);
|
|
gpio_set_value(st->pdata->sample, 0);
|
|
/* delay (6 * tck + 20) nano seconds */
|
|
udelay(1);
|
|
|
|
switch (chan->type) {
|
|
case IIO_ANGL:
|
|
ad2s1210_set_mode(MOD_POS, st);
|
|
break;
|
|
case IIO_ANGL_VEL:
|
|
ad2s1210_set_mode(MOD_VEL, st);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = spi_read(st->sdev, st->rx, 2);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
|
|
switch (chan->type) {
|
|
case IIO_ANGL:
|
|
pos = be16_to_cpup((__be16 *)st->rx);
|
|
if (st->hysteresis)
|
|
pos >>= 16 - st->resolution;
|
|
*val = pos;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
case IIO_ANGL_VEL:
|
|
negative = st->rx[0] & 0x80;
|
|
vel = be16_to_cpup((__be16 *)st->rx);
|
|
vel >>= 16 - st->resolution;
|
|
if (vel & 0x8000) {
|
|
negative = (0xffff >> st->resolution) << st->resolution;
|
|
vel |= negative;
|
|
}
|
|
*val = vel;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
mutex_unlock(&st->lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
error_ret:
|
|
gpio_set_value(st->pdata->sample, 1);
|
|
/* delay (2 * tck + 20) nano seconds */
|
|
udelay(1);
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(fclkin, 0644,
|
|
ad2s1210_show_fclkin, ad2s1210_store_fclkin, 0);
|
|
static IIO_DEVICE_ATTR(fexcit, 0644,
|
|
ad2s1210_show_fexcit, ad2s1210_store_fexcit, 0);
|
|
static IIO_DEVICE_ATTR(control, 0644,
|
|
ad2s1210_show_control, ad2s1210_store_control, 0);
|
|
static IIO_DEVICE_ATTR(bits, 0644,
|
|
ad2s1210_show_resolution, ad2s1210_store_resolution, 0);
|
|
static IIO_DEVICE_ATTR(fault, 0644,
|
|
ad2s1210_show_fault, ad2s1210_clear_fault, 0);
|
|
|
|
static IIO_DEVICE_ATTR(los_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_LOS_THRD);
|
|
static IIO_DEVICE_ATTR(dos_ovr_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_DOS_OVR_THRD);
|
|
static IIO_DEVICE_ATTR(dos_mis_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_DOS_MIS_THRD);
|
|
static IIO_DEVICE_ATTR(dos_rst_max_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_DOS_RST_MAX_THRD);
|
|
static IIO_DEVICE_ATTR(dos_rst_min_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_DOS_RST_MIN_THRD);
|
|
static IIO_DEVICE_ATTR(lot_high_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_LOT_HIGH_THRD);
|
|
static IIO_DEVICE_ATTR(lot_low_thrd, 0644,
|
|
ad2s1210_show_reg, ad2s1210_store_reg,
|
|
AD2S1210_REG_LOT_LOW_THRD);
|
|
|
|
static const struct iio_chan_spec ad2s1210_channels[] = {
|
|
{
|
|
.type = IIO_ANGL,
|
|
.indexed = 1,
|
|
.channel = 0,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
|
}, {
|
|
.type = IIO_ANGL_VEL,
|
|
.indexed = 1,
|
|
.channel = 0,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
|
}
|
|
};
|
|
|
|
static struct attribute *ad2s1210_attributes[] = {
|
|
&iio_dev_attr_fclkin.dev_attr.attr,
|
|
&iio_dev_attr_fexcit.dev_attr.attr,
|
|
&iio_dev_attr_control.dev_attr.attr,
|
|
&iio_dev_attr_bits.dev_attr.attr,
|
|
&iio_dev_attr_fault.dev_attr.attr,
|
|
&iio_dev_attr_los_thrd.dev_attr.attr,
|
|
&iio_dev_attr_dos_ovr_thrd.dev_attr.attr,
|
|
&iio_dev_attr_dos_mis_thrd.dev_attr.attr,
|
|
&iio_dev_attr_dos_rst_max_thrd.dev_attr.attr,
|
|
&iio_dev_attr_dos_rst_min_thrd.dev_attr.attr,
|
|
&iio_dev_attr_lot_high_thrd.dev_attr.attr,
|
|
&iio_dev_attr_lot_low_thrd.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ad2s1210_attribute_group = {
|
|
.attrs = ad2s1210_attributes,
|
|
};
|
|
|
|
static int ad2s1210_initial(struct ad2s1210_state *st)
|
|
{
|
|
unsigned char data;
|
|
int ret;
|
|
|
|
mutex_lock(&st->lock);
|
|
if (st->pdata->gpioin)
|
|
st->resolution = ad2s1210_read_resolution_pin(st);
|
|
else
|
|
ad2s1210_set_resolution_pin(st);
|
|
|
|
ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
data = AD2S1210_DEF_CONTROL & ~(AD2S1210_SET_RESOLUTION);
|
|
data |= (st->resolution - 10) >> 1;
|
|
ret = ad2s1210_config_write(st, data);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
|
|
if (ret & AD2S1210_MSB_IS_HIGH) {
|
|
ret = -EIO;
|
|
goto error_ret;
|
|
}
|
|
|
|
ret = ad2s1210_update_frequency_control_word(st);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
ret = ad2s1210_soft_reset(st);
|
|
error_ret:
|
|
mutex_unlock(&st->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_info ad2s1210_info = {
|
|
.read_raw = ad2s1210_read_raw,
|
|
.attrs = &ad2s1210_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
|
|
{
|
|
unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
|
|
struct gpio ad2s1210_gpios[] = {
|
|
{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
|
|
{ st->pdata->a[0], flags, "a0" },
|
|
{ st->pdata->a[1], flags, "a1" },
|
|
{ st->pdata->res[0], flags, "res0" },
|
|
{ st->pdata->res[0], flags, "res1" },
|
|
};
|
|
|
|
return gpio_request_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
|
|
}
|
|
|
|
static void ad2s1210_free_gpios(struct ad2s1210_state *st)
|
|
{
|
|
unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
|
|
struct gpio ad2s1210_gpios[] = {
|
|
{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
|
|
{ st->pdata->a[0], flags, "a0" },
|
|
{ st->pdata->a[1], flags, "a1" },
|
|
{ st->pdata->res[0], flags, "res0" },
|
|
{ st->pdata->res[0], flags, "res1" },
|
|
};
|
|
|
|
gpio_free_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
|
|
}
|
|
|
|
static int ad2s1210_probe(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct ad2s1210_state *st;
|
|
int ret;
|
|
|
|
if (!spi->dev.platform_data)
|
|
return -EINVAL;
|
|
|
|
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
st = iio_priv(indio_dev);
|
|
st->pdata = spi->dev.platform_data;
|
|
ret = ad2s1210_setup_gpios(st);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
spi_set_drvdata(spi, indio_dev);
|
|
|
|
mutex_init(&st->lock);
|
|
st->sdev = spi;
|
|
st->hysteresis = true;
|
|
st->mode = MOD_CONFIG;
|
|
st->resolution = 12;
|
|
st->fexcit = AD2S1210_DEF_EXCIT;
|
|
|
|
indio_dev->dev.parent = &spi->dev;
|
|
indio_dev->info = &ad2s1210_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = ad2s1210_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(ad2s1210_channels);
|
|
indio_dev->name = spi_get_device_id(spi)->name;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_gpios;
|
|
|
|
st->fclkin = spi->max_speed_hz;
|
|
spi->mode = SPI_MODE_3;
|
|
spi_setup(spi);
|
|
ad2s1210_initial(st);
|
|
|
|
return 0;
|
|
|
|
error_free_gpios:
|
|
ad2s1210_free_gpios(st);
|
|
return ret;
|
|
}
|
|
|
|
static int ad2s1210_remove(struct spi_device *spi)
|
|
{
|
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
ad2s1210_free_gpios(iio_priv(indio_dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct spi_device_id ad2s1210_id[] = {
|
|
{ "ad2s1210" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ad2s1210_id);
|
|
|
|
static struct spi_driver ad2s1210_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
},
|
|
.probe = ad2s1210_probe,
|
|
.remove = ad2s1210_remove,
|
|
.id_table = ad2s1210_id,
|
|
};
|
|
module_spi_driver(ad2s1210_driver);
|
|
|
|
MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD2S1210 Resolver to Digital SPI driver");
|
|
MODULE_LICENSE("GPL v2");
|