Release 4.7 drivers/gpu/drm/drm_mipi_dsi.c

Directory: drivers/gpu/drm
/*
 * MIPI DSI Bus
 *
 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
 * Andrzej Hajda <a.hajda@samsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <drm/drm_mipi_dsi.h>

#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>

#include <video/mipi_display.h>

/**
 * DOC: dsi helpers
 *
 * These functions contain some common logic and helpers to deal with MIPI DSI
 * peripherals.
 *
 * Helpers are provided for a number of standard MIPI DSI command as well as a
 * subset of the MIPI DCS command set.
 */



static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
{
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	/* attempt OF style match */
	if (of_driver_match_device(dev, drv))
		return 1;

	/* compare DSI device and driver names */
	if (!strcmp(dsi->name, drv->name))
		return 1;

	return 0;
}

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static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
	.runtime_suspend = pm_generic_runtime_suspend,
	.runtime_resume = pm_generic_runtime_resume,
	.suspend = pm_generic_suspend,
	.resume = pm_generic_resume,
	.freeze = pm_generic_freeze,
	.thaw = pm_generic_thaw,
	.poweroff = pm_generic_poweroff,
	.restore = pm_generic_restore,
};


static struct bus_type mipi_dsi_bus_type = {
	.name = "mipi-dsi",
	.match = mipi_dsi_device_match,
	.pm = &mipi_dsi_device_pm_ops,
};



static int of_device_match(struct device *dev, void *data)
{
	return dev->of_node == data;
}

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/**
 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
 *    device tree node
 * @np: device tree node
 *
 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
 *    such device exists (or has not been registered yet).
 */


struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
{
	struct device *dev;

	dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);

	return dev ? to_mipi_dsi_device(dev) : NULL;
}
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EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);



static void mipi_dsi_dev_release(struct device *dev)
{
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	of_node_put(dev->of_node);
	kfree(dsi);
}

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static const struct device_type mipi_dsi_device_type = {
	.release = mipi_dsi_dev_release,
};



static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
{
	struct mipi_dsi_device *dsi;

	dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
	if (!dsi)
		return ERR_PTR(-ENOMEM);

	dsi->host = host;
	dsi->dev.bus = &mipi_dsi_bus_type;
	dsi->dev.parent = host->dev;
	dsi->dev.type = &mipi_dsi_device_type;

	device_initialize(&dsi->dev);

	return dsi;
}

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static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
{
	struct mipi_dsi_host *host = dsi->host;

	dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev),  dsi->channel);

	return device_add(&dsi->dev);
}

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#if IS_ENABLED(CONFIG_OF)

static struct mipi_dsi_device *

of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
{
	struct device *dev = host->dev;
	struct mipi_dsi_device_info info = { };
	int ret;
	u32 reg;

	if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
		dev_err(dev, "modalias failure on %s\n", node->full_name);
		return ERR_PTR(-EINVAL);
	}

	ret = of_property_read_u32(node, "reg", &reg);
	if (ret) {
		dev_err(dev, "device node %s has no valid reg property: %d\n",
			node->full_name, ret);
		return ERR_PTR(-EINVAL);
	}

	info.channel = reg;
	info.node = of_node_get(node);

	return mipi_dsi_device_register_full(host, &info);
}
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#else

static struct mipi_dsi_device *

of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
{
	return ERR_PTR(-ENODEV);
}
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#endif

/**
 * mipi_dsi_device_register_full - create a MIPI DSI device
 * @host: DSI host to which this device is connected
 * @info: pointer to template containing DSI device information
 *
 * Create a MIPI DSI device by using the device information provided by
 * mipi_dsi_device_info template
 *
 * Returns:
 * A pointer to the newly created MIPI DSI device, or, a pointer encoded
 * with an error
 */

struct mipi_dsi_device *

mipi_dsi_device_register_full(struct mipi_dsi_host *host,
			      const struct mipi_dsi_device_info *info)
{
	struct mipi_dsi_device *dsi;
	struct device *dev = host->dev;
	int ret;

	if (!info) {
		dev_err(dev, "invalid mipi_dsi_device_info pointer\n");
		return ERR_PTR(-EINVAL);
	}

	if (info->channel > 3) {
		dev_err(dev, "invalid virtual channel: %u\n", info->channel);
		return ERR_PTR(-EINVAL);
	}

	dsi = mipi_dsi_device_alloc(host);
	if (IS_ERR(dsi)) {
		dev_err(dev, "failed to allocate DSI device %ld\n",
			PTR_ERR(dsi));
		return dsi;
	}

	dsi->dev.of_node = info->node;
	dsi->channel = info->channel;
	strlcpy(dsi->name, info->type, sizeof(dsi->name));

	ret = mipi_dsi_device_add(dsi);
	if (ret) {
		dev_err(dev, "failed to add DSI device %d\n", ret);
		kfree(dsi);
		return ERR_PTR(ret);
	}

	return dsi;
}
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EXPORT_SYMBOL(mipi_dsi_device_register_full);

/**
 * mipi_dsi_device_unregister - unregister MIPI DSI device
 * @dsi: DSI peripheral device
 */


void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
{
	device_unregister(&dsi->dev);
}
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EXPORT_SYMBOL(mipi_dsi_device_unregister);

static DEFINE_MUTEX(host_lock);
static LIST_HEAD(host_list);

/**
 * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a
 *                                   device tree node
 * @node: device tree node
 *
 * Returns:
 * A pointer to the MIPI DSI host corresponding to @node or NULL if no
 * such device exists (or has not been registered yet).
 */


struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
{
	struct mipi_dsi_host *host;

	mutex_lock(&host_lock);

	list_for_each_entry(host, &host_list, list) {
		if (host->dev->of_node == node) {
			mutex_unlock(&host_lock);
			return host;
		}
	}

	mutex_unlock(&host_lock);

	return NULL;
}
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EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);



int mipi_dsi_host_register(struct mipi_dsi_host *host)
{
	struct device_node *node;

	for_each_available_child_of_node(host->dev->of_node, node) {
		/* skip nodes without reg property */
		if (!of_find_property(node, "reg", NULL))
			continue;
		of_mipi_dsi_device_add(host, node);
	}

	mutex_lock(&host_lock);
	list_add_tail(&host->list, &host_list);
	mutex_unlock(&host_lock);

	return 0;
}
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EXPORT_SYMBOL(mipi_dsi_host_register);



static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
{
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	mipi_dsi_device_unregister(dsi);

	return 0;
}

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void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
{
	device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);

	mutex_lock(&host_lock);
	list_del_init(&host->list);
	mutex_unlock(&host_lock);
}
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EXPORT_SYMBOL(mipi_dsi_host_unregister);

/**
 * mipi_dsi_attach - attach a DSI device to its DSI host
 * @dsi: DSI peripheral
 */


int mipi_dsi_attach(struct mipi_dsi_device *dsi)
{
	const struct mipi_dsi_host_ops *ops = dsi->host->ops;

	if (!ops || !ops->attach)
		return -ENOSYS;

	return ops->attach(dsi->host, dsi);
}
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EXPORT_SYMBOL(mipi_dsi_attach);

/**
 * mipi_dsi_detach - detach a DSI device from its DSI host
 * @dsi: DSI peripheral
 */


int mipi_dsi_detach(struct mipi_dsi_device *dsi)
{
	const struct mipi_dsi_host_ops *ops = dsi->host->ops;

	if (!ops || !ops->detach)
		return -ENOSYS;

	return ops->detach(dsi->host, dsi);
}
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EXPORT_SYMBOL(mipi_dsi_detach);



static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
					struct mipi_dsi_msg *msg)
{
	const struct mipi_dsi_host_ops *ops = dsi->host->ops;

	if (!ops || !ops->transfer)
		return -ENOSYS;

	if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
		msg->flags |= MIPI_DSI_MSG_USE_LPM;

	return ops->transfer(dsi->host, msg);
}

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/**
 * mipi_dsi_packet_format_is_short - check if a packet is of the short format
 * @type: MIPI DSI data type of the packet
 *
 * Return: true if the packet for the given data type is a short packet, false
 * otherwise.
 */


bool mipi_dsi_packet_format_is_short(u8 type)
{
	switch (type) {
	case MIPI_DSI_V_SYNC_START:
	case MIPI_DSI_V_SYNC_END:
	case MIPI_DSI_H_SYNC_START:
	case MIPI_DSI_H_SYNC_END:
	case MIPI_DSI_END_OF_TRANSMISSION:
	case MIPI_DSI_COLOR_MODE_OFF:
	case MIPI_DSI_COLOR_MODE_ON:
	case MIPI_DSI_SHUTDOWN_PERIPHERAL:
	case MIPI_DSI_TURN_ON_PERIPHERAL:
	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
	case MIPI_DSI_DCS_SHORT_WRITE:
	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
	case MIPI_DSI_DCS_READ:
	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
		return true;
	}

	return false;
}
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EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);

/**
 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
 * @type: MIPI DSI data type of the packet
 *
 * Return: true if the packet for the given data type is a long packet, false
 * otherwise.
 */


bool mipi_dsi_packet_format_is_long(u8 type)
{
	switch (type) {
	case MIPI_DSI_NULL_PACKET:
	case MIPI_DSI_BLANKING_PACKET:
	case MIPI_DSI_GENERIC_LONG_WRITE:
	case MIPI_DSI_DCS_LONG_WRITE:
	case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
	case MIPI_DSI_PACKED_PIXEL_STREAM_30:
	case MIPI_DSI_PACKED_PIXEL_STREAM_36:
	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
	case MIPI_DSI_PACKED_PIXEL_STREAM_16:
	case MIPI_DSI_PACKED_PIXEL_STREAM_18:
	case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
	case MIPI_DSI_PACKED_PIXEL_STREAM_24:
		return true;
	}

	return false;
}
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EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);

/**
 * mipi_dsi_create_packet - create a packet from a message according to the
 *     DSI protocol
 * @packet: pointer to a DSI packet structure
 * @msg: message to translate into a packet
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
			   const struct mipi_dsi_msg *msg)
{
	if (!packet || !msg)
		return -EINVAL;

	/* do some minimum sanity checking */
	if (!mipi_dsi_packet_format_is_short(msg->type) &&
	    !mipi_dsi_packet_format_is_long(msg->type))
		return -EINVAL;

	if (msg->channel > 3)
		return -EINVAL;

	memset(packet, 0, sizeof(*packet));
	packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);

	/* TODO: compute ECC if hardware support is not available */

	/*
         * Long write packets contain the word count in header bytes 1 and 2.
         * The payload follows the header and is word count bytes long.
         *
         * Short write packets encode up to two parameters in header bytes 1
         * and 2.
         */
	if (mipi_dsi_packet_format_is_long(msg->type)) {
		packet->header[1] = (msg->tx_len >> 0) & 0xff;
		packet->header[2] = (msg->tx_len >> 8) & 0xff;

		packet->payload_length = msg->tx_len;
		packet->payload = msg->tx_buf;
	} else {
		const u8 *tx = msg->tx_buf;

		packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
		packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
	}

	packet->size = sizeof(packet->header) + packet->payload_length;

	return 0;
}
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EXPORT_SYMBOL(mipi_dsi_create_packet);

/**
 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
		.tx_buf = (u8 [2]) { 0, 0 },
		.tx_len = 2,
        };

	return mipi_dsi_device_transfer(dsi, &msg);
}
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EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);

/**
 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.type = MIPI_DSI_TURN_ON_PERIPHERAL,
		.tx_buf = (u8 [2]) { 0, 0 },
		.tx_len = 2,
        };

	return mipi_dsi_device_transfer(dsi, &msg);
}
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EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);

/*
 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
 *    the payload in a long packet transmitted from the peripheral back to the
 *    host processor
 * @dsi: DSI peripheral device
 * @value: the maximum size of the payload
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
					    u16 value)
{
	u8 tx[2] = { value & 0xff, value >> 8 };
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
		.tx_len = sizeof(tx),
		.tx_buf = tx,
        };

	return mipi_dsi_device_transfer(dsi, &msg);
}
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EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);

/**
 * mipi_dsi_generic_write() - transmit data using a generic write packet
 * @dsi: DSI peripheral device
 * @payload: buffer containing the payload
 * @size: size of payload buffer
 *
 * This function will automatically choose the right data type depending on
 * the payload length.
 *
 * Return: The number of bytes transmitted on success or a negative error code
 * on failure.
 */


ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
			       size_t size)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.tx_buf = payload,
		.tx_len = size
	};

	switch (size) {
	case 0:
		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
		break;

	case 1:
		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
		break;

	case 2:
		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
		break;

	default:
		msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
		break;
	}

	return mipi_dsi_device_transfer(dsi, &msg);
}
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EXPORT_SYMBOL(mipi_dsi_generic_write);

/**
 * mipi_dsi_generic_read() - receive data using a generic read packet
 * @dsi: DSI peripheral device
 * @params: buffer containing the request parameters
 * @num_params: number of request parameters
 * @data: buffer in which to return the received data
 * @size: size of receive buffer
 *
 * This function will automatically choose the right data type depending on
 * the number of parameters passed in.
 *
 * Return: The number of bytes successfully read or a negative error code on
 * failure.
 */


ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
			      size_t num_params, void *data, size_t size)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.tx_len = num_params,
		.tx_buf = params,
		.rx_len = size,
		.rx_buf = data
	};

	switch (num_params) {
	case 0:
		msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
		break;

	case 1:
		msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
		break;

	case 2:
		msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
		break;

	default:
		return -EINVAL;
	}

	return mipi_dsi_device_transfer(dsi, &msg);
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 108 100.00% 1 100.00%
Total 108 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_generic_read);

/**
 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
 * @dsi: DSI peripheral device
 * @data: buffer containing data to be transmitted
 * @len: size of transmission buffer
 *
 * This function will automatically choose the right data type depending on
 * the command payload length.
 *
 * Return: The number of bytes successfully transmitted or a negative error
 * code on failure.
 */


ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
				  const void *data, size_t len)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.tx_buf = data,
		.tx_len = len
	};

	switch (len) {
	case 0:
		return -EINVAL;

	case 1:
		msg.type = MIPI_DSI_DCS_SHORT_WRITE;
		break;

	case 2:
		msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
		break;

	default:
		msg.type = MIPI_DSI_DCS_LONG_WRITE;
		break;
	}

	return mipi_dsi_device_transfer(dsi, &msg);
}
Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 86 94.51% 1 20.00%
thierry reding thierry reding 5 5.49% 4 80.00%
Total 91 100.00% 5 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);

/**
 * mipi_dsi_dcs_write() - send DCS write command
 * @dsi: DSI peripheral device
 * @cmd: DCS command
 * @data: buffer containing the command payload
 * @len: command payload length
 *
 * This function will automatically choose the right data type depending on
 * the command payload length.
 *
 * Return: The number of bytes successfully transmitted or a negative error
 * code on failure.
 */


ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
			   const void *data, size_t len)
{
	ssize_t err;
	size_t size;
	u8 *tx;

	if (len > 0) {
		size = 1 + len;

		tx = kmalloc(size, GFP_KERNEL);
		if (!tx)
			return -ENOMEM;

		/* concatenate the DCS command byte and the payload */
		tx[0] = cmd;
		memcpy(&tx[1], data, len);
	} else {
		tx = &cmd;
		size = 1;
	}

	err = mipi_dsi_dcs_write_buffer(dsi, tx, size);

	if (len > 0)
		kfree(tx);

	return err;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 121 100.00% 1 100.00%
Total 121 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_write);

/**
 * mipi_dsi_dcs_read() - send DCS read request command
 * @dsi: DSI peripheral device
 * @cmd: DCS command
 * @data: buffer in which to receive data
 * @len: size of receive buffer
 *
 * Return: The number of bytes read or a negative error code on failure.
 */


ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
			  size_t len)
{
	struct mipi_dsi_msg msg = {
		.channel = dsi->channel,
		.type = MIPI_DSI_DCS_READ,
		.tx_buf = &cmd,
		.tx_len = 1,
		.rx_buf = data,
		.rx_len = len
	};

	return mipi_dsi_device_transfer(dsi, &msg);
}
Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 65 95.59% 1 33.33%
thierry reding thierry reding 3 4.41% 2 66.67%
Total 68 100.00% 3 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_read);

/**
 * mipi_dsi_dcs_nop() - send DCS nop packet
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_nop);

/**
 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);

/**
 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
 *    mode
 * @dsi: DSI peripheral device
 * @mode: return location for the current power mode
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
{
	ssize_t err;

	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
				sizeof(*mode));
	if (err <= 0) {
		if (err == 0)
			err = -ENODATA;

		return err;
	}

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);

/**
 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
 *    data used by the interface
 * @dsi: DSI peripheral device
 * @format: return location for the pixel format
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
{
	ssize_t err;

	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
				sizeof(*format));
	if (err <= 0) {
		if (err == 0)
			err = -ENODATA;

		return err;
	}

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);

/**
 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
 *    display module except interface communication
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);

/**
 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
 *    module
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);

/**
 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
 *    display device
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);

/**
 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
 *    display device
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure
 */


int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);

/**
 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
 *    memory accessed by the host processor
 * @dsi: DSI peripheral device
 * @start: first column of frame memory
 * @end: last column of frame memory
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
				    u16 end)
{
	u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
				 sizeof(payload));
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 71 100.00% 1 100.00%
Total 71 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);

/**
 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
 *    memory accessed by the host processor
 * @dsi: DSI peripheral device
 * @start: first page of frame memory
 * @end: last page of frame memory
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
				  u16 end)
{
	u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
				 sizeof(payload));
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 71 100.00% 1 100.00%
Total 71 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);

/**
 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
 *    output signal on the TE signal line
 * @dsi: DSI peripheral device
 *
 * Return: 0 on success or a negative error code on failure
 */


int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 38 100.00% 1 100.00%
Total 38 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);

/**
 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
 *    output signal on the TE signal line.
 * @dsi: DSI peripheral device
 * @mode: the Tearing Effect Output Line mode
 *
 * Return: 0 on success or a negative error code on failure
 */


int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
			     enum mipi_dsi_dcs_tear_mode mode)
{
	u8 value = mode;
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
				 sizeof(value));
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
youngjun cho youngjun cho 51 100.00% 1 100.00%
Total 51 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);

/**
 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
 *    data used by the interface
 * @dsi: DSI peripheral device
 * @format: pixel format
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
{
	ssize_t err;

	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
				 sizeof(format));
	if (err < 0)
		return err;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);



static int mipi_dsi_drv_probe(struct device *dev)
{
	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	return drv->probe(dsi);
}

Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static int mipi_dsi_drv_remove(struct device *dev)
{
	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	return drv->remove(dsi);
}

Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static void mipi_dsi_drv_shutdown(struct device *dev)
{
	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);

	drv->shutdown(dsi);
}

Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 40 100.00% 1 100.00%
Total 40 100.00% 1 100.00%

/**
 * mipi_dsi_driver_register_full() - register a driver for DSI devices
 * @drv: DSI driver structure
 * @owner: owner module
 *
 * Return: 0 on success or a negative error code on failure.
 */


int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
				  struct module *owner)
{
	drv->driver.bus = &mipi_dsi_bus_type;
	drv->driver.owner = owner;

	if (drv->probe)
		drv->driver.probe = mipi_dsi_drv_probe;
	if (drv->remove)
		drv->driver.remove = mipi_dsi_drv_remove;
	if (drv->shutdown)
		drv->driver.shutdown = mipi_dsi_drv_shutdown;

	return driver_register(&drv->driver);
}
Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 55 66.27% 1 33.33%
thierry reding thierry reding 28 33.73% 2 66.67%
Total 83 100.00% 3 100.00%


EXPORT_SYMBOL(mipi_dsi_driver_register_full);

/**
 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
 * @drv: DSI driver structure
 *
 * Return: 0 on success or a negative error code on failure.
 */


void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
{
	driver_unregister(&drv->driver);
}
Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%


EXPORT_SYMBOL(mipi_dsi_driver_unregister);



static int __init mipi_dsi_bus_init(void)
{
	return bus_register(&mipi_dsi_bus_type);
}
Contributors
Person Tokens Prop Commits CommitProp
andrzej hajda andrzej hajda 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%


postcore_initcall(mipi_dsi_bus_init);

MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
MODULE_DESCRIPTION("MIPI DSI Bus");
MODULE_LICENSE("GPL and additional rights");
Overall Contributors
Person Tokens Prop Commits CommitProp
thierry reding thierry reding 1380 41.92% 17 62.96%
andrzej hajda andrzej hajda 1050 31.90% 2 7.41%
archit taneja archit taneja 384 11.66% 5 18.52%
youngjun cho youngjun cho 352 10.69% 2 7.41%
werner johansson werner johansson 126 3.83% 1 3.70%
Total 3292 100.00% 27 100.00%
  Directory: drivers/gpu/drm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
archit taneja	archit taneja	37	61.67%	1	50.00%
andrzej hajda	andrzej hajda	23	38.33%	1	50.00%
	Total	60	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/gpu/drm/drm_mipi_dsi.c

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