include/drm/drm_mipi_dsi.h

   1 /*
   2  * MIPI DSI Bus
   3  *
   4  * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
   5  * Andrzej Hajda <a.hajda@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __DRM_MIPI_DSI_H__
  13 #define __DRM_MIPI_DSI_H__
  14
  15 #include <linux/device.h>
  16
  17 struct mipi_dsi_host;
  18 struct mipi_dsi_device;
  19
  20 /* request ACK from peripheral */
  21 #define MIPI_DSI_MSG_REQ_ACK    BIT(0)
  22 /* use Low Power Mode to transmit message */
  23 #define MIPI_DSI_MSG_USE_LPM    BIT(1)
  24
  25 /**
  26  * struct mipi_dsi_msg - read/write DSI buffer
  27  * @channel: virtual channel id
  28  * @type: payload data type
  29  * @tx_len: length of @tx_buf
  30  * @tx_buf: data to be written
  31  * @rx_len: length of @rx_buf
  32  * @rx_buf: data to be read, or NULL
  33  */
  34 struct mipi_dsi_msg {
  35         u8 channel;
  36         u8 type;
  37         u16 flags;
  38
  39         size_t tx_len;
  40         const void *tx_buf;
  41
  42         size_t rx_len;
  43         void *rx_buf;
  44 };
  45
  46 /**
  47  * struct mipi_dsi_host_ops - DSI bus operations
  48  * @attach: attach DSI device to DSI host
  49  * @detach: detach DSI device from DSI host
  50  * @transfer: send and/or receive DSI packet, return number of received bytes,
  51  *            or error
  52  */
  53 struct mipi_dsi_host_ops {
  54         int (*attach)(struct mipi_dsi_host *host,
  55                       struct mipi_dsi_device *dsi);
  56         int (*detach)(struct mipi_dsi_host *host,
  57                       struct mipi_dsi_device *dsi);
  58         ssize_t (*transfer)(struct mipi_dsi_host *host,
  59                             struct mipi_dsi_msg *msg);
  60 };
  61
  62 /**
  63  * struct mipi_dsi_host - DSI host device
  64  * @dev: driver model device node for this DSI host
  65  * @ops: DSI host operations
  66  */
  67 struct mipi_dsi_host {
  68         struct device *dev;
  69         const struct mipi_dsi_host_ops *ops;
  70 };
  71
  72 int mipi_dsi_host_register(struct mipi_dsi_host *host);
  73 void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
  74
  75 /* DSI mode flags */
  76
  77 /* video mode */
  78 #define MIPI_DSI_MODE_VIDEO             BIT(0)
  79 /* video burst mode */
  80 #define MIPI_DSI_MODE_VIDEO_BURST       BIT(1)
  81 /* video pulse mode */
  82 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE  BIT(2)
  83 /* enable auto vertical count mode */
  84 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT   BIT(3)
  85 /* enable hsync-end packets in vsync-pulse and v-porch area */
  86 #define MIPI_DSI_MODE_VIDEO_HSE         BIT(4)
  87 /* disable hfront-porch area */
  88 #define MIPI_DSI_MODE_VIDEO_HFP         BIT(5)
  89 /* disable hback-porch area */
  90 #define MIPI_DSI_MODE_VIDEO_HBP         BIT(6)
  91 /* disable hsync-active area */
  92 #define MIPI_DSI_MODE_VIDEO_HSA         BIT(7)
  93 /* flush display FIFO on vsync pulse */
  94 #define MIPI_DSI_MODE_VSYNC_FLUSH       BIT(8)
  95 /* disable EoT packets in HS mode */
  96 #define MIPI_DSI_MODE_EOT_PACKET        BIT(9)
  97
  98 enum mipi_dsi_pixel_format {
  99         MIPI_DSI_FMT_RGB888,
 100         MIPI_DSI_FMT_RGB666,
 101         MIPI_DSI_FMT_RGB666_PACKED,
 102         MIPI_DSI_FMT_RGB565,
 103 };
 104
 105 /**
 106  * struct mipi_dsi_device - DSI peripheral device
 107  * @host: DSI host for this peripheral
 108  * @dev: driver model device node for this peripheral
 109  * @channel: virtual channel assigned to the peripheral
 110  * @format: pixel format for video mode
 111  * @lanes: number of active data lanes
 112  * @mode_flags: DSI operation mode related flags
 113  */
 114 struct mipi_dsi_device {
 115         struct mipi_dsi_host *host;
 116         struct device dev;
 117
 118         unsigned int channel;
 119         unsigned int lanes;
 120         enum mipi_dsi_pixel_format format;
 121         unsigned long mode_flags;
 122 };
 123
 124 #define to_mipi_dsi_device(d) container_of(d, struct mipi_dsi_device, dev)
 125
 126 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 127 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
 128 int mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, unsigned int channel,
 129                        const void *data, size_t len);
 130 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, unsigned int channel,
 131                           u8 cmd, void *data, size_t len);
 132
 133 /**
 134  * struct mipi_dsi_driver - DSI driver
 135  * @driver: device driver model driver
 136  * @probe: callback for device binding
 137  * @remove: callback for device unbinding
 138  */
 139 struct mipi_dsi_driver {
 140         struct device_driver driver;
 141         int(*probe)(struct mipi_dsi_device *dsi);
 142         int(*remove)(struct mipi_dsi_device *dsi);
 143 };
 144
 145 #define to_mipi_dsi_driver(d) container_of(d, struct mipi_dsi_driver, driver)
 146
 147 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
 148 {
 149         return dev_get_drvdata(&dsi->dev);
 150 }
 151
 152 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
 153 {
 154         dev_set_drvdata(&dsi->dev, data);
 155 }
 156
 157 int mipi_dsi_driver_register(struct mipi_dsi_driver *driver);
 158 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
 159
 160 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
 161         module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
 162                         mipi_dsi_driver_unregister)
 163
 164 #endif /* __DRM_MIPI_DSI__ */