drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h

   1 #ifndef __NVKM_I2C_H__
   2 #define __NVKM_I2C_H__
   3 #include <core/subdev.h>
   4 #include <core/event.h>
   5
   6 #include <subdev/bios.h>
   7 #include <subdev/bios/i2c.h>
   8
   9 #define NV_I2C_PORT(n)    (0x00 + (n))
  10 #define NV_I2C_AUX(n)     (0x10 + (n))
  11 #define NV_I2C_EXT(n)     (0x20 + (n))
  12 #define NV_I2C_DEFAULT(n) (0x80 + (n))
  13
  14 #define NV_I2C_TYPE_DCBI2C(n) (0x0000 | (n))
  15 #define NV_I2C_TYPE_EXTDDC(e) (0x0005 | (e) << 8)
  16 #define NV_I2C_TYPE_EXTAUX(e) (0x0006 | (e) << 8)
  17
  18 struct nvkm_i2c_ntfy_req {
  19 #define NVKM_I2C_PLUG                                                      0x01
  20 #define NVKM_I2C_UNPLUG                                                    0x02
  21 #define NVKM_I2C_IRQ                                                       0x04
  22 #define NVKM_I2C_DONE                                                      0x08
  23 #define NVKM_I2C_ANY                                                       0x0f
  24         u8 mask;
  25         u8 port;
  26 };
  27
  28 struct nvkm_i2c_ntfy_rep {
  29         u8 mask;
  30 };
  31
  32 struct nvkm_i2c_port {
  33         struct nvkm_object base;
  34         struct i2c_adapter adapter;
  35         struct mutex mutex;
  36
  37         struct list_head head;
  38         u8  index;
  39         int aux;
  40
  41         const struct nvkm_i2c_func *func;
  42 };
  43
  44 struct nvkm_i2c_func {
  45         void (*drive_scl)(struct nvkm_i2c_port *, int);
  46         void (*drive_sda)(struct nvkm_i2c_port *, int);
  47         int  (*sense_scl)(struct nvkm_i2c_port *);
  48         int  (*sense_sda)(struct nvkm_i2c_port *);
  49
  50         int  (*aux)(struct nvkm_i2c_port *, bool, u8, u32, u8 *, u8);
  51         int  (*pattern)(struct nvkm_i2c_port *, int pattern);
  52         int  (*lnk_ctl)(struct nvkm_i2c_port *, int nr, int bw, bool enh);
  53         int  (*drv_ctl)(struct nvkm_i2c_port *, int lane, int sw, int pe);
  54 };
  55
  56 struct nvkm_i2c_board_info {
  57         struct i2c_board_info dev;
  58         u8 udelay; /* set to 0 to use the standard delay */
  59 };
  60
  61 struct nvkm_i2c {
  62         struct nvkm_subdev subdev;
  63         struct nvkm_event event;
  64
  65         struct nvkm_i2c_port *(*find)(struct nvkm_i2c *, u8 index);
  66         struct nvkm_i2c_port *(*find_type)(struct nvkm_i2c *, u16 type);
  67         int  (*acquire_pad)(struct nvkm_i2c_port *, unsigned long timeout);
  68         void (*release_pad)(struct nvkm_i2c_port *);
  69         int  (*acquire)(struct nvkm_i2c_port *, unsigned long timeout);
  70         void (*release)(struct nvkm_i2c_port *);
  71         int  (*identify)(struct nvkm_i2c *, int index,
  72                          const char *what, struct nvkm_i2c_board_info *,
  73                          bool (*match)(struct nvkm_i2c_port *,
  74                                        struct i2c_board_info *, void *),
  75                          void *);
  76
  77         wait_queue_head_t wait;
  78         struct list_head ports;
  79 };
  80
  81 static inline struct nvkm_i2c *
  82 nvkm_i2c(void *obj)
  83 {
  84         return (void *)nvkm_subdev(obj, NVDEV_SUBDEV_I2C);
  85 }
  86
  87 extern struct nvkm_oclass *nv04_i2c_oclass;
  88 extern struct nvkm_oclass *nv4e_i2c_oclass;
  89 extern struct nvkm_oclass *nv50_i2c_oclass;
  90 extern struct nvkm_oclass *g94_i2c_oclass;
  91 extern struct nvkm_oclass *gf110_i2c_oclass;
  92 extern struct nvkm_oclass *gf117_i2c_oclass;
  93 extern struct nvkm_oclass *gk104_i2c_oclass;
  94 extern struct nvkm_oclass *gm204_i2c_oclass;
  95
  96 static inline int
  97 nv_rdi2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg)
  98 {
  99         u8 val;
 100         struct i2c_msg msgs[] = {
 101                 { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 102                 { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 103         };
 104
 105         int ret = i2c_transfer(&port->adapter, msgs, 2);
 106         if (ret != 2)
 107                 return -EIO;
 108
 109         return val;
 110 }
 111
 112 static inline int
 113 nv_wri2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg, u8 val)
 114 {
 115         u8 buf[2] = { reg, val };
 116         struct i2c_msg msgs[] = {
 117                 { .addr = addr, .flags = 0, .len = 2, .buf = buf },
 118         };
 119
 120         int ret = i2c_transfer(&port->adapter, msgs, 1);
 121         if (ret != 1)
 122                 return -EIO;
 123
 124         return 0;
 125 }
 126
 127 static inline bool
 128 nv_probe_i2c(struct nvkm_i2c_port *port, u8 addr)
 129 {
 130         return nv_rdi2cr(port, addr, 0) >= 0;
 131 }
 132
 133 int nv_rdaux(struct nvkm_i2c_port *, u32 addr, u8 *data, u8 size);
 134 int nv_wraux(struct nvkm_i2c_port *, u32 addr, u8 *data, u8 size);
 135 #endif