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/*
* MIPI DSI Bus
*
* Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
* Andrzej Hajda <a.hajda@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __DRM_MIPI_DSI_H__
#define __DRM_MIPI_DSI_H__
#include <linux/device.h>
struct mipi_dsi_host;
struct mipi_dsi_device;
/* request ACK from peripheral */
#define MIPI_DSI_MSG_REQ_ACK BIT(0)
/* use Low Power Mode to transmit message */
#define MIPI_DSI_MSG_USE_LPM BIT(1)
/**
* struct mipi_dsi_msg - read/write DSI buffer
* @channel: virtual channel id
* @type: payload data type
* @flags: flags controlling this message transmission
* @tx_len: length of @tx_buf
* @tx_buf: data to be written
* @rx_len: length of @rx_buf
* @rx_buf: data to be read, or NULL
*/
struct mipi_dsi_msg {
u8 channel;
u8 type;
u16 flags;
size_t tx_len;
const void *tx_buf;
size_t rx_len;
void *rx_buf;
};
bool mipi_dsi_packet_format_is_short(u8 type);
bool mipi_dsi_packet_format_is_long(u8 type);
/**
* struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
* @size: size (in bytes) of the packet
* @header: the four bytes that make up the header (Data ID, Word Count or
* Packet Data, and ECC)
* @payload_length: number of bytes in the payload
* @payload: a pointer to a buffer containing the payload, if any
*/
struct mipi_dsi_packet {
size_t size;
u8 header[4];
size_t payload_length;
const u8 *payload;
};
int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
const struct mipi_dsi_msg *msg);
/**
* struct mipi_dsi_host_ops - DSI bus operations
* @attach: attach DSI device to DSI host
* @detach: detach DSI device from DSI host
* @transfer: transmit a DSI packet
*
* DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
* structures. This structure contains information about the type of packet
* being transmitted as well as the transmit and receive buffers. When an
* error is encountered during transmission, this function will return a
* negative error code. On success it shall return the number of bytes
* transmitted for write packets or the number of bytes received for read
* packets.
*
* Note that typically DSI packet transmission is atomic, so the .transfer()
* function will seldomly return anything other than the number of bytes
* contained in the transmit buffer on success.
*/
struct mipi_dsi_host_ops {
int (*attach)(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi);
int (*detach)(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi);
ssize_t (*transfer)(struct mipi_dsi_host *host,
const struct mipi_dsi_msg *msg);
};
/**
* struct mipi_dsi_host - DSI host device
* @dev: driver model device node for this DSI host
* @ops: DSI host operations
*/
struct mipi_dsi_host {
struct device *dev;
const struct mipi_dsi_host_ops *ops;
};
int mipi_dsi_host_register(struct mipi_dsi_host *host);
void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
/* DSI mode flags */
/* video mode */
#define MIPI_DSI_MODE_VIDEO BIT(0)
/* video burst mode */
#define MIPI_DSI_MODE_VIDEO_BURST BIT(1)
/* video pulse mode */
#define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2)
/* enable auto vertical count mode */
#define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3)
/* enable hsync-end packets in vsync-pulse and v-porch area */
#define MIPI_DSI_MODE_VIDEO_HSE BIT(4)
/* disable hfront-porch area */
#define MIPI_DSI_MODE_VIDEO_HFP BIT(5)
/* disable hback-porch area */
#define MIPI_DSI_MODE_VIDEO_HBP BIT(6)
/* disable hsync-active area */
#define MIPI_DSI_MODE_VIDEO_HSA BIT(7)
/* flush display FIFO on vsync pulse */
#define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8)
/* disable EoT packets in HS mode */
#define MIPI_DSI_MODE_EOT_PACKET BIT(9)
/* device supports non-continuous clock behavior (DSI spec 5.6.1) */
#define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10)
/* transmit data in low power */
#define MIPI_DSI_MODE_LPM BIT(11)
enum mipi_dsi_pixel_format {
MIPI_DSI_FMT_RGB888,
MIPI_DSI_FMT_RGB666,
MIPI_DSI_FMT_RGB666_PACKED,
MIPI_DSI_FMT_RGB565,
};
/**
* struct mipi_dsi_device - DSI peripheral device
* @host: DSI host for this peripheral
* @dev: driver model device node for this peripheral
* @channel: virtual channel assigned to the peripheral
* @format: pixel format for video mode
* @lanes: number of active data lanes
* @mode_flags: DSI operation mode related flags
*/
struct mipi_dsi_device {
struct mipi_dsi_host *host;
struct device dev;
unsigned int channel;
unsigned int lanes;
enum mipi_dsi_pixel_format format;
unsigned long mode_flags;
};
static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
{
return container_of(dev, struct mipi_dsi_device, dev);
}
int mipi_dsi_attach(struct mipi_dsi_device *dsi);
int mipi_dsi_detach(struct mipi_dsi_device *dsi);
int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
u16 value);
ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
size_t size);
ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
size_t num_params, void *data, size_t size);
/**
* enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
* @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
* information only
* @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
* V-Blanking and H-Blanking information
*/
enum mipi_dsi_dcs_tear_mode {
MIPI_DSI_DCS_TEAR_MODE_VBLANK,
MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
};
ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
const void *data, size_t len);
ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
const void *data, size_t len);
ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
size_t len);
int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
enum mipi_dsi_dcs_tear_mode mode);
/**
* struct mipi_dsi_driver - DSI driver
* @driver: device driver model driver
* @probe: callback for device binding
* @remove: callback for device unbinding
* @shutdown: called at shutdown time to quiesce the device
*/
struct mipi_dsi_driver {
struct device_driver driver;
int(*probe)(struct mipi_dsi_device *dsi);
int(*remove)(struct mipi_dsi_device *dsi);
void (*shutdown)(struct mipi_dsi_device *dsi);
};
static inline struct mipi_dsi_driver *
to_mipi_dsi_driver(struct device_driver *driver)
{
return container_of(driver, struct mipi_dsi_driver, driver);
}
static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
{
return dev_get_drvdata(&dsi->dev);
}
static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
{
dev_set_drvdata(&dsi->dev, data);
}
int mipi_dsi_driver_register(struct mipi_dsi_driver *driver);
void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
#define module_mipi_dsi_driver(__mipi_dsi_driver) \
module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
mipi_dsi_driver_unregister)
#endif /* __DRM_MIPI_DSI__ */
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