drivers/adc/adc-uclass.c - uboot-imx - Git at Google

 /*
  * Copyright (C) 2015 Samsung Electronics
  * Przemyslaw Marczak <p.marczak@samsung.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <errno.h>
 #include <dm.h>
 #include <dm/lists.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <adc.h>
 #include <power/regulator.h>

 DECLARE_GLOBAL_DATA_PTR;

 #define ADC_UCLASS_PLATDATA_SIZE	sizeof(struct adc_uclass_platdata)
 #define CHECK_NUMBER			true
 #define CHECK_MASK			(!CHECK_NUMBER)

 /* TODO: add support for timer uclass (for early calls) */
 #ifdef CONFIG_SANDBOX_ARCH
 #define sdelay(x)	udelay(x)
 #else
 extern void sdelay(unsigned long loops);
 #endif

 static int check_channel(struct udevice *dev, int value, bool number_or_mask,
 			 const char *caller_function)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	unsigned mask = number_or_mask ? (1 << value) : value;

 	/* For the real ADC hardware, some ADC channels can be inactive.
 	 * For example if device has 4 analog channels, and only channels
 	 * 1-st and 3-rd are valid, then channel mask is: 0b1010, so request
 	 * with mask 0b1110 should return an error.
 	*/
 	if ((uc_pdata->channel_mask >= mask) && (uc_pdata->channel_mask & mask))
 		return 0;

 	printf("Error in %s/%s().\nWrong channel selection for device: %s\n",
 	       __FILE__, caller_function, dev->name);

 	return -EINVAL;
 }

 static int adc_supply_enable(struct udevice *dev)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	const char *supply_type;
 	int ret = 0;

 	if (uc_pdata->vdd_supply) {
 		supply_type = "vdd";
 		ret = regulator_set_enable(uc_pdata->vdd_supply, true);
 	}

 	if (!ret && uc_pdata->vss_supply) {
 		supply_type = "vss";
 		ret = regulator_set_enable(uc_pdata->vss_supply, true);
 	}

 	if (ret)
 		error("%s: can't enable %s-supply!", dev->name, supply_type);

 	return ret;
 }

 int adc_data_mask(struct udevice *dev, unsigned int *data_mask)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);

 	if (!uc_pdata)
 		return -ENOSYS;

 	*data_mask = uc_pdata->data_mask;
 	return 0;
 }

 int adc_stop(struct udevice *dev)
 {
 	const struct adc_ops *ops = dev_get_driver_ops(dev);

 	if (!ops->stop)
 		return -ENOSYS;

 	return ops->stop(dev);
 }

 int adc_start_channel(struct udevice *dev, int channel)
 {
 	const struct adc_ops *ops = dev_get_driver_ops(dev);
 	int ret;

 	if (!ops->start_channel)
 		return -ENOSYS;

 	ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
 	if (ret)
 		return ret;

 	ret = adc_supply_enable(dev);
 	if (ret)
 		return ret;

 	return ops->start_channel(dev, channel);
 }

 int adc_start_channels(struct udevice *dev, unsigned int channel_mask)
 {
 	const struct adc_ops *ops = dev_get_driver_ops(dev);
 	int ret;

 	if (!ops->start_channels)
 		return -ENOSYS;

 	ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
 	if (ret)
 		return ret;

 	ret = adc_supply_enable(dev);
 	if (ret)
 		return ret;

 	return ops->start_channels(dev, channel_mask);
 }

 int adc_channel_data(struct udevice *dev, int channel, unsigned int *data)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	const struct adc_ops *ops = dev_get_driver_ops(dev);
 	unsigned int timeout_us = uc_pdata->data_timeout_us;
 	int ret;

 	if (!ops->channel_data)
 		return -ENOSYS;

 	ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
 	if (ret)
 		return ret;

 	do {
 		ret = ops->channel_data(dev, channel, data);
 		if (!ret || ret != -EBUSY)
 			break;

 		/* TODO: use timer uclass (for early calls). */
 		sdelay(5);
 	} while (timeout_us--);

 	return ret;
 }

 int adc_channels_data(struct udevice *dev, unsigned int channel_mask,
 		      struct adc_channel *channels)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	unsigned int timeout_us = uc_pdata->multidata_timeout_us;
 	const struct adc_ops *ops = dev_get_driver_ops(dev);
 	int ret;

 	if (!ops->channels_data)
 		return -ENOSYS;

 	ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
 	if (ret)
 		return ret;

 	do {
 		ret = ops->channels_data(dev, channel_mask, channels);
 		if (!ret || ret != -EBUSY)
 			break;

 		/* TODO: use timer uclass (for early calls). */
 		sdelay(5);
 	} while (timeout_us--);

 	return ret;
 }

 int adc_channel_single_shot(const char *name, int channel, unsigned int *data)
 {
 	struct udevice *dev;
 	int ret;

 	ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
 	if (ret)
 		return ret;

 	ret = adc_start_channel(dev, channel);
 	if (ret)
 		return ret;

 	ret = adc_channel_data(dev, channel, data);
 	if (ret)
 		return ret;

 	return 0;
 }

 static int _adc_channels_single_shot(struct udevice *dev,
 				     unsigned int channel_mask,
 				     struct adc_channel *channels)
 {
 	unsigned int data;
 	int channel, ret;

 	for (channel = 0; channel <= ADC_MAX_CHANNEL; channel++) {
 		/* Check channel bit. */
 		if (!((channel_mask >> channel) & 0x1))
 			continue;

 		ret = adc_start_channel(dev, channel);
 		if (ret)
 			return ret;

 		ret = adc_channel_data(dev, channel, &data);
 		if (ret)
 			return ret;

 		channels->id = channel;
 		channels->data = data;
 		channels++;
 	}

 	return 0;
 }

 int adc_channels_single_shot(const char *name, unsigned int channel_mask,
 			     struct adc_channel *channels)
 {
 	struct udevice *dev;
 	int ret;

 	ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
 	if (ret)
 		return ret;

 	ret = adc_start_channels(dev, channel_mask);
 	if (ret)
 		goto try_manual;

 	ret = adc_channels_data(dev, channel_mask, channels);
 	if (ret)
 		return ret;

 	return 0;

 try_manual:
 	if (ret != -ENOSYS)
 		return ret;

 	return _adc_channels_single_shot(dev, channel_mask, channels);
 }

 static int adc_vdd_platdata_update(struct udevice *dev)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret;

 	/* Warning!
 	 * This function can't return supply device before its bind.
 	 * Please pay attention to proper fdt scan sequence. If ADC device
 	 * will bind before its supply regulator device, then the below 'get'
 	 * will return an error.
 	 */
 	ret = device_get_supply_regulator(dev, "vdd-supply",
 					  &uc_pdata->vdd_supply);
 	if (ret)
 		return ret;

 	ret = regulator_get_value(uc_pdata->vdd_supply);
 	if (ret < 0)
 		return ret;

 	uc_pdata->vdd_microvolts = ret;

 	return 0;
 }

 static int adc_vss_platdata_update(struct udevice *dev)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret;

 	ret = device_get_supply_regulator(dev, "vss-supply",
 					  &uc_pdata->vss_supply);
 	if (ret)
 		return ret;

 	ret = regulator_get_value(uc_pdata->vss_supply);
 	if (ret < 0)
 		return ret;

 	uc_pdata->vss_microvolts = ret;

 	return 0;
 }

 int adc_vdd_value(struct udevice *dev, int *uV)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret, value_sign = uc_pdata->vdd_polarity_negative ? -1 : 1;

 	if (!uc_pdata->vdd_supply)
 		goto nodev;

 	/* Update the regulator Value. */
 	ret = adc_vdd_platdata_update(dev);
 	if (ret)
 		return ret;
 nodev:
 	if (uc_pdata->vdd_microvolts == -ENODATA)
 		return -ENODATA;

 	*uV = uc_pdata->vdd_microvolts * value_sign;

 	return 0;
 }

 int adc_vss_value(struct udevice *dev, int *uV)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret, value_sign = uc_pdata->vss_polarity_negative ? -1 : 1;

 	if (!uc_pdata->vss_supply)
 		goto nodev;

 	/* Update the regulator Value. */
 	ret = adc_vss_platdata_update(dev);
 	if (ret)
 		return ret;
 nodev:
 	if (uc_pdata->vss_microvolts == -ENODATA)
 		return -ENODATA;

 	*uV = uc_pdata->vss_microvolts * value_sign;

 	return 0;
 }

 static int adc_vdd_platdata_set(struct udevice *dev)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret, offset = dev_of_offset(dev);
 	const void *fdt = gd->fdt_blob;
 	char *prop;

 	prop = "vdd-polarity-negative";
 	uc_pdata->vdd_polarity_negative = fdtdec_get_bool(fdt, offset, prop);

 	ret = adc_vdd_platdata_update(dev);
 	if (ret != -ENOENT)
 		return ret;

 	/* No vdd-supply phandle. */
 	prop  = "vdd-microvolts";
 	uc_pdata->vdd_microvolts = fdtdec_get_int(fdt, offset, prop, -ENODATA);

 	return 0;
 }

 static int adc_vss_platdata_set(struct udevice *dev)
 {
 	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
 	int ret, offset = dev_of_offset(dev);
 	const void *fdt = gd->fdt_blob;
 	char *prop;

 	prop = "vss-polarity-negative";
 	uc_pdata->vss_polarity_negative = fdtdec_get_bool(fdt, offset, prop);

 	ret = adc_vss_platdata_update(dev);
 	if (ret != -ENOENT)
 		return ret;

 	/* No vss-supply phandle. */
 	prop = "vss-microvolts";
 	uc_pdata->vss_microvolts = fdtdec_get_int(fdt, offset, prop, -ENODATA);

 	return 0;
 }

 static int adc_pre_probe(struct udevice *dev)
 {
 	int ret;

 	/* Set ADC VDD platdata: polarity, uV, regulator (phandle). */
 	ret = adc_vdd_platdata_set(dev);
 	if (ret)
 		error("%s: Can't update Vdd. Error: %d", dev->name, ret);

 	/* Set ADC VSS platdata: polarity, uV, regulator (phandle). */
 	ret = adc_vss_platdata_set(dev);
 	if (ret)
 		error("%s: Can't update Vss. Error: %d", dev->name, ret);

 	return 0;
 }

 UCLASS_DRIVER(adc) = {
 	.id	= UCLASS_ADC,
 	.name	= "adc",
 	.pre_probe =  adc_pre_probe,
 	.per_device_platdata_auto_alloc_size = ADC_UCLASS_PLATDATA_SIZE,
 };
	/*
	* Copyright (C) 2015 Samsung Electronics
	* Przemyslaw Marczak <p.marczak@samsung.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <errno.h>
	#include <dm.h>
	#include <dm/lists.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#include <adc.h>
	#include <power/regulator.h>

	DECLARE_GLOBAL_DATA_PTR;

	#define ADC_UCLASS_PLATDATA_SIZE sizeof(struct adc_uclass_platdata)
	#define CHECK_NUMBER true
	#define CHECK_MASK (!CHECK_NUMBER)

	/* TODO: add support for timer uclass (for early calls) */
	#ifdef CONFIG_SANDBOX_ARCH
	#define sdelay(x) udelay(x)
	#else
	extern void sdelay(unsigned long loops);
	#endif

	static int check_channel(struct udevice *dev, int value, bool number_or_mask,
	const char *caller_function)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	unsigned mask = number_or_mask ? (1 << value) : value;

	/* For the real ADC hardware, some ADC channels can be inactive.
	* For example if device has 4 analog channels, and only channels
	* 1-st and 3-rd are valid, then channel mask is: 0b1010, so request
	* with mask 0b1110 should return an error.
	*/
	if ((uc_pdata->channel_mask >= mask) && (uc_pdata->channel_mask & mask))
	return 0;

	printf("Error in %s/%s().\nWrong channel selection for device: %s\n",
	__FILE__, caller_function, dev->name);

	return -EINVAL;
	}

	static int adc_supply_enable(struct udevice *dev)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	const char *supply_type;
	int ret = 0;

	if (uc_pdata->vdd_supply) {
	supply_type = "vdd";
	ret = regulator_set_enable(uc_pdata->vdd_supply, true);
	}

	if (!ret && uc_pdata->vss_supply) {
	supply_type = "vss";
	ret = regulator_set_enable(uc_pdata->vss_supply, true);
	}

	if (ret)
	error("%s: can't enable %s-supply!", dev->name, supply_type);

	return ret;
	}

	int adc_data_mask(struct udevice dev, unsigned int data_mask)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);

	if (!uc_pdata)
	return -ENOSYS;

	*data_mask = uc_pdata->data_mask;
	return 0;
	}

	int adc_stop(struct udevice *dev)
	{
	const struct adc_ops *ops = dev_get_driver_ops(dev);

	if (!ops->stop)
	return -ENOSYS;

	return ops->stop(dev);
	}

	int adc_start_channel(struct udevice *dev, int channel)
	{
	const struct adc_ops *ops = dev_get_driver_ops(dev);
	int ret;

	if (!ops->start_channel)
	return -ENOSYS;

	ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
	if (ret)
	return ret;

	ret = adc_supply_enable(dev);
	if (ret)
	return ret;

	return ops->start_channel(dev, channel);
	}

	int adc_start_channels(struct udevice *dev, unsigned int channel_mask)
	{
	const struct adc_ops *ops = dev_get_driver_ops(dev);
	int ret;

	if (!ops->start_channels)
	return -ENOSYS;

	ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
	if (ret)
	return ret;

	ret = adc_supply_enable(dev);
	if (ret)
	return ret;

	return ops->start_channels(dev, channel_mask);
	}

	int adc_channel_data(struct udevice dev, int channel, unsigned int data)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	const struct adc_ops *ops = dev_get_driver_ops(dev);
	unsigned int timeout_us = uc_pdata->data_timeout_us;
	int ret;

	if (!ops->channel_data)
	return -ENOSYS;

	ret = check_channel(dev, channel, CHECK_NUMBER, __func__);
	if (ret)
	return ret;

	do {
	ret = ops->channel_data(dev, channel, data);
	if (!ret \|\| ret != -EBUSY)
	break;

	/* TODO: use timer uclass (for early calls). */
	sdelay(5);
	} while (timeout_us--);

	return ret;
	}

	int adc_channels_data(struct udevice *dev, unsigned int channel_mask,
	struct adc_channel *channels)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	unsigned int timeout_us = uc_pdata->multidata_timeout_us;
	const struct adc_ops *ops = dev_get_driver_ops(dev);
	int ret;

	if (!ops->channels_data)
	return -ENOSYS;

	ret = check_channel(dev, channel_mask, CHECK_MASK, __func__);
	if (ret)
	return ret;

	do {
	ret = ops->channels_data(dev, channel_mask, channels);
	if (!ret \|\| ret != -EBUSY)
	break;

	/* TODO: use timer uclass (for early calls). */
	sdelay(5);
	} while (timeout_us--);

	return ret;
	}

	int adc_channel_single_shot(const char name, int channel, unsigned int data)
	{
	struct udevice *dev;
	int ret;

	ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
	if (ret)
	return ret;

	ret = adc_start_channel(dev, channel);
	if (ret)
	return ret;

	ret = adc_channel_data(dev, channel, data);
	if (ret)
	return ret;

	return 0;
	}

	static int _adc_channels_single_shot(struct udevice *dev,
	unsigned int channel_mask,
	struct adc_channel *channels)
	{
	unsigned int data;
	int channel, ret;

	for (channel = 0; channel <= ADC_MAX_CHANNEL; channel++) {
	/* Check channel bit. */
	if (!((channel_mask >> channel) & 0x1))
	continue;

	ret = adc_start_channel(dev, channel);
	if (ret)
	return ret;

	ret = adc_channel_data(dev, channel, &data);
	if (ret)
	return ret;

	channels->id = channel;
	channels->data = data;
	channels++;
	}

	return 0;
	}

	int adc_channels_single_shot(const char *name, unsigned int channel_mask,
	struct adc_channel *channels)
	{
	struct udevice *dev;
	int ret;

	ret = uclass_get_device_by_name(UCLASS_ADC, name, &dev);
	if (ret)
	return ret;

	ret = adc_start_channels(dev, channel_mask);
	if (ret)
	goto try_manual;

	ret = adc_channels_data(dev, channel_mask, channels);
	if (ret)
	return ret;

	return 0;

	try_manual:
	if (ret != -ENOSYS)
	return ret;

	return _adc_channels_single_shot(dev, channel_mask, channels);
	}

	static int adc_vdd_platdata_update(struct udevice *dev)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret;

	/* Warning!
	* This function can't return supply device before its bind.
	* Please pay attention to proper fdt scan sequence. If ADC device
	* will bind before its supply regulator device, then the below 'get'
	* will return an error.
	*/
	ret = device_get_supply_regulator(dev, "vdd-supply",
	&uc_pdata->vdd_supply);
	if (ret)
	return ret;

	ret = regulator_get_value(uc_pdata->vdd_supply);
	if (ret < 0)
	return ret;

	uc_pdata->vdd_microvolts = ret;

	return 0;
	}

	static int adc_vss_platdata_update(struct udevice *dev)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret;

	ret = device_get_supply_regulator(dev, "vss-supply",
	&uc_pdata->vss_supply);
	if (ret)
	return ret;

	ret = regulator_get_value(uc_pdata->vss_supply);
	if (ret < 0)
	return ret;

	uc_pdata->vss_microvolts = ret;

	return 0;
	}

	int adc_vdd_value(struct udevice dev, int uV)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret, value_sign = uc_pdata->vdd_polarity_negative ? -1 : 1;

	if (!uc_pdata->vdd_supply)
	goto nodev;

	/* Update the regulator Value. */
	ret = adc_vdd_platdata_update(dev);
	if (ret)
	return ret;
	nodev:
	if (uc_pdata->vdd_microvolts == -ENODATA)
	return -ENODATA;

	uV = uc_pdata->vdd_microvolts value_sign;

	return 0;
	}

	int adc_vss_value(struct udevice dev, int uV)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret, value_sign = uc_pdata->vss_polarity_negative ? -1 : 1;

	if (!uc_pdata->vss_supply)
	goto nodev;

	/* Update the regulator Value. */
	ret = adc_vss_platdata_update(dev);
	if (ret)
	return ret;
	nodev:
	if (uc_pdata->vss_microvolts == -ENODATA)
	return -ENODATA;

	uV = uc_pdata->vss_microvolts value_sign;

	return 0;
	}

	static int adc_vdd_platdata_set(struct udevice *dev)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret, offset = dev_of_offset(dev);
	const void *fdt = gd->fdt_blob;
	char *prop;

	prop = "vdd-polarity-negative";
	uc_pdata->vdd_polarity_negative = fdtdec_get_bool(fdt, offset, prop);

	ret = adc_vdd_platdata_update(dev);
	if (ret != -ENOENT)
	return ret;

	/* No vdd-supply phandle. */
	prop = "vdd-microvolts";
	uc_pdata->vdd_microvolts = fdtdec_get_int(fdt, offset, prop, -ENODATA);

	return 0;
	}

	static int adc_vss_platdata_set(struct udevice *dev)
	{
	struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
	int ret, offset = dev_of_offset(dev);
	const void *fdt = gd->fdt_blob;
	char *prop;

	prop = "vss-polarity-negative";
	uc_pdata->vss_polarity_negative = fdtdec_get_bool(fdt, offset, prop);

	ret = adc_vss_platdata_update(dev);
	if (ret != -ENOENT)
	return ret;

	/* No vss-supply phandle. */
	prop = "vss-microvolts";
	uc_pdata->vss_microvolts = fdtdec_get_int(fdt, offset, prop, -ENODATA);

	return 0;
	}

	static int adc_pre_probe(struct udevice *dev)
	{
	int ret;

	/* Set ADC VDD platdata: polarity, uV, regulator (phandle). */
	ret = adc_vdd_platdata_set(dev);
	if (ret)
	error("%s: Can't update Vdd. Error: %d", dev->name, ret);

	/* Set ADC VSS platdata: polarity, uV, regulator (phandle). */
	ret = adc_vss_platdata_set(dev);
	if (ret)
	error("%s: Can't update Vss. Error: %d", dev->name, ret);

	return 0;
	}

	UCLASS_DRIVER(adc) = {
	.id = UCLASS_ADC,
	.name = "adc",
	.pre_probe = adc_pre_probe,
	.per_device_platdata_auto_alloc_size = ADC_UCLASS_PLATDATA_SIZE,
	};