LXR linux/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
   9struct nvkm_i2c_ntfy_req {
  10#define NVKM_I2C_PLUG                                                      0x01
  11#define NVKM_I2C_UNPLUG                                                    0x02
  12#define NVKM_I2C_IRQ                                                       0x04
  13#define NVKM_I2C_DONE                                                      0x08
  14#define NVKM_I2C_ANY                                                       0x0f
  15        u8 mask;
  16        u8 port;
  17};
  18
  19struct nvkm_i2c_ntfy_rep {
  20        u8 mask;
  21};
  22
  23struct nvkm_i2c_bus_probe {
  24        struct i2c_board_info dev;
  25        u8 udelay; /* set to 0 to use the standard delay */
  26};
  27
  28struct nvkm_i2c_bus {
  29        const struct nvkm_i2c_bus_func *func;
  30        struct nvkm_i2c_pad *pad;
  31#define NVKM_I2C_BUS_CCB(n) /* 'n' is ccb index */                           (n)
  32#define NVKM_I2C_BUS_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
  33#define NVKM_I2C_BUS_PRI /* ccb primary comm. port */                        -1
  34#define NVKM_I2C_BUS_SEC /* ccb secondary comm. port */                      -2
  35        int id;
  36
  37        struct mutex mutex;
  38        struct list_head head;
  39        struct i2c_adapter i2c;
  40};
  41
  42int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
  43void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
  44int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
  45                       struct nvkm_i2c_bus_probe *,
  46                       bool (*)(struct nvkm_i2c_bus *,
  47                                struct i2c_board_info *, void *), void *);
  48
  49struct nvkm_i2c_aux {
  50        const struct nvkm_i2c_aux_func *func;
  51        struct nvkm_i2c_pad *pad;
  52#define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */                           (n)
  53#define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
  54        int id;
  55
  56        struct mutex mutex;
  57        struct list_head head;
  58        struct i2c_adapter i2c;
  59
  60        u32 intr;
  61};
  62
  63void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
  64int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
  65void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
  66int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
  67                      u32 addr, u8 *data, u8 size);
  68int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
  69                         bool enhanced_framing);
  70
  71struct nvkm_i2c {
  72        const struct nvkm_i2c_func *func;
  73        struct nvkm_subdev subdev;
  74
  75        struct list_head pad;
  76        struct list_head bus;
  77        struct list_head aux;
  78
  79        struct nvkm_event event;
  80};
  81
  82struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
  83struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
  84
  85int nv04_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  86int nv4e_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  87int nv50_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  88int g94_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  89int gf117_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  90int gf119_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  91int gk104_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  92int gm204_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  93
  94static inline int
  95nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
  96{
  97        u8 val;
  98        struct i2c_msg msgs[] = {
  99                { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 100                { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 101        };
 102
 103        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 104        if (ret != 2)
 105                return -EIO;
 106
 107        return val;
 108}
 109
 110static inline int
 111nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
 112{
 113        u8 buf[2] = { reg, val };
 114        struct i2c_msg msgs[] = {
 115                { .addr = addr, .flags = 0, .len = 2, .buf = buf },
 116        };
 117
 118        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 119        if (ret != 1)
 120                return -EIO;
 121
 122        return 0;
 123}
 124
 125static inline bool
 126nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
 127{
 128        return nvkm_rdi2cr(adap, addr, 0) >= 0;
 129}
 130
 131static inline int
 132nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 133{
 134        int ret = nvkm_i2c_aux_acquire(aux);
 135        if (ret == 0) {
 136                ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, size);
 137                nvkm_i2c_aux_release(aux);
 138        }
 139        return ret;
 140}
 141
 142static inline int
 143nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 144{
 145        int ret = nvkm_i2c_aux_acquire(aux);
 146        if (ret == 0) {
 147                ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, size);
 148                nvkm_i2c_aux_release(aux);
 149        }
 150        return ret;
 151}
 152#endif
 153