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

   1 #ifndef __NOUVEAU_I2C_H__
   2 #define __NOUVEAU_I2C_H__
   3
   4 #include <core/subdev.h>
   5 #include <core/device.h>
   6
   7 #include <subdev/bios.h>
   8 #include <subdev/bios/i2c.h>
   9
  10 #define NV_I2C_PORT(n)    (0x00 + (n))
  11 #define NV_I2C_DEFAULT(n) (0x80 + (n))
  12
  13 #define NV_I2C_TYPE_DCBI2C(n) (0x0000 | (n))
  14 #define NV_I2C_TYPE_EXTDDC(e) (0x0005 | (e) << 8)
  15 #define NV_I2C_TYPE_EXTAUX(e) (0x0006 | (e) << 8)
  16
  17 enum nvkm_i2c_event {
  18         NVKM_I2C_PLUG = 1,
  19         NVKM_I2C_UNPLUG = 2,
  20         NVKM_I2C_IRQ = 4,
  21         NVKM_I2C_DONE = 8,
  22         NVKM_I2C_ANY = (NVKM_I2C_PLUG |
  23                         NVKM_I2C_UNPLUG |
  24                         NVKM_I2C_IRQ |
  25                         NVKM_I2C_DONE),
  26 };
  27
  28 struct nouveau_i2c_port {
  29         struct nouveau_object base;
  30         struct i2c_adapter adapter;
  31         struct mutex mutex;
  32
  33         struct list_head head;
  34         u8  index;
  35         int aux;
  36
  37         const struct nouveau_i2c_func *func;
  38 };
  39
  40 struct nouveau_i2c_func {
  41         void (*drive_scl)(struct nouveau_i2c_port *, int);
  42         void (*drive_sda)(struct nouveau_i2c_port *, int);
  43         int  (*sense_scl)(struct nouveau_i2c_port *);
  44         int  (*sense_sda)(struct nouveau_i2c_port *);
  45
  46         int  (*aux)(struct nouveau_i2c_port *, bool, u8, u32, u8 *, u8);
  47         int  (*pattern)(struct nouveau_i2c_port *, int pattern);
  48         int  (*lnk_ctl)(struct nouveau_i2c_port *, int nr, int bw, bool enh);
  49         int  (*drv_ctl)(struct nouveau_i2c_port *, int lane, int sw, int pe);
  50 };
  51
  52 struct nouveau_i2c_board_info {
  53         struct i2c_board_info dev;
  54         u8 udelay; /* set to 0 to use the standard delay */
  55 };
  56
  57 struct nouveau_i2c {
  58         struct nouveau_subdev base;
  59         struct nouveau_event *ntfy;
  60
  61         struct nouveau_i2c_port *(*find)(struct nouveau_i2c *, u8 index);
  62         struct nouveau_i2c_port *(*find_type)(struct nouveau_i2c *, u16 type);
  63         int  (*acquire_pad)(struct nouveau_i2c_port *, unsigned long timeout);
  64         void (*release_pad)(struct nouveau_i2c_port *);
  65         int  (*acquire)(struct nouveau_i2c_port *, unsigned long timeout);
  66         void (*release)(struct nouveau_i2c_port *);
  67         int (*identify)(struct nouveau_i2c *, int index,
  68                         const char *what, struct nouveau_i2c_board_info *,
  69                         bool (*match)(struct nouveau_i2c_port *,
  70                                       struct i2c_board_info *, void *), void *);
  71
  72         wait_queue_head_t wait;
  73         struct list_head ports;
  74 };
  75
  76 static inline struct nouveau_i2c *
  77 nouveau_i2c(void *obj)
  78 {
  79         return (void *)nv_device(obj)->subdev[NVDEV_SUBDEV_I2C];
  80 }
  81
  82 extern struct nouveau_oclass *nv04_i2c_oclass;
  83 extern struct nouveau_oclass *nv4e_i2c_oclass;
  84 extern struct nouveau_oclass *nv50_i2c_oclass;
  85 extern struct nouveau_oclass *nv94_i2c_oclass;
  86 extern struct nouveau_oclass *nvd0_i2c_oclass;
  87 extern struct nouveau_oclass *gf117_i2c_oclass;
  88 extern struct nouveau_oclass *nve0_i2c_oclass;
  89
  90 static inline int
  91 nv_rdi2cr(struct nouveau_i2c_port *port, u8 addr, u8 reg)
  92 {
  93         u8 val;
  94         struct i2c_msg msgs[] = {
  95                 { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
  96                 { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
  97         };
  98
  99         int ret = i2c_transfer(&port->adapter, msgs, 2);
 100         if (ret != 2)
 101                 return -EIO;
 102
 103         return val;
 104 }
 105
 106 static inline int
 107 nv_wri2cr(struct nouveau_i2c_port *port, u8 addr, u8 reg, u8 val)
 108 {
 109         u8 buf[2] = { reg, val };
 110         struct i2c_msg msgs[] = {
 111                 { .addr = addr, .flags = 0, .len = 2, .buf = buf },
 112         };
 113
 114         int ret = i2c_transfer(&port->adapter, msgs, 1);
 115         if (ret != 1)
 116                 return -EIO;
 117
 118         return 0;
 119 }
 120
 121 static inline bool
 122 nv_probe_i2c(struct nouveau_i2c_port *port, u8 addr)
 123 {
 124         return nv_rdi2cr(port, addr, 0) >= 0;
 125 }
 126
 127 int nv_rdaux(struct nouveau_i2c_port *, u32 addr, u8 *data, u8 size);
 128 int nv_wraux(struct nouveau_i2c_port *, u32 addr, u8 *data, u8 size);
 129
 130 #endif