drivers/media/dvb/frontends/s921_module.c

   1 /*
   2  * Driver for Sharp s921 driver
   3  *
   4  * Copyright (C) 2008 Markus Rechberger <mrechberger@sundtek.de>
   5  *
   6  * All rights reserved.
   7  *
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/delay.h>
  14 #include "dvb_frontend.h"
  15 #include "s921_module.h"
  16 #include "s921_core.h"
  17
  18 static  unsigned int debug = 0;
  19 module_param(debug, int, 0644);
  20 MODULE_PARM_DESC(debug,"s921 debugging (default off)");
  21
  22 #define dprintk(fmt, args...) if (debug) do {\
  23                         printk("s921 debug: " fmt, ##args); } while (0)
  24
  25 struct s921_state
  26 {
  27         struct dvb_frontend frontend;
  28         fe_modulation_t current_modulation;
  29         __u32 snr;
  30         __u32 current_frequency;
  31         __u8 addr;
  32         struct s921_isdb_t dev;
  33         struct i2c_adapter *i2c;
  34 };
  35
  36 static int s921_set_parameters(struct dvb_frontend *fe, struct dvb_frontend_parameters *param) {
  37         struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
  38         struct s921_isdb_t_transmission_mode_params params;
  39         struct s921_isdb_t_tune_params tune_params;
  40
  41         tune_params.frequency = param->frequency;
  42         s921_isdb_cmd(&state->dev, ISDB_T_CMD_SET_PARAM, &params);
  43         s921_isdb_cmd(&state->dev, ISDB_T_CMD_TUNE, &tune_params);
  44         mdelay(100);
  45         return 0;
  46 }
  47
  48 static int s921_init(struct dvb_frontend *fe) {
  49         printk("s921 init\n");
  50         return 0;
  51 }
  52
  53 static int s921_sleep(struct dvb_frontend *fe) {
  54         printk("s921 sleep\n");
  55         return 0;
  56 }
  57
  58 static int s921_read_status(struct dvb_frontend *fe, fe_status_t *status)
  59 {
  60         struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
  61         unsigned int ret;
  62         mdelay(5);
  63         s921_isdb_cmd(&state->dev, ISDB_T_CMD_GET_STATUS, &ret);
  64         *status = 0;
  65
  66         printk("status: %02x\n", ret);
  67         if (ret == 1) {
  68                 *status |= FE_HAS_CARRIER;
  69                 *status |= FE_HAS_VITERBI;
  70                 *status |= FE_HAS_LOCK;
  71                 *status |= FE_HAS_SYNC;
  72                 *status |= FE_HAS_SIGNAL;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int s921_read_ber(struct dvb_frontend *fe, __u32 *ber)
  79 {
  80         dprintk("read ber\n");
  81         return 0;
  82 }
  83
  84 static int s921_read_snr(struct dvb_frontend *fe, __u16 *snr)
  85 {
  86         dprintk("read snr\n");
  87         return 0;
  88 }
  89
  90 static int s921_read_ucblocks(struct dvb_frontend *fe, __u32 *ucblocks)
  91 {
  92         dprintk("read ucblocks\n");
  93         return 0;
  94 }
  95
  96 static void s921_release(struct dvb_frontend *fe)
  97 {
  98         struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
  99         kfree(state);
 100 }
 101
 102 static struct dvb_frontend_ops demod_s921={
 103         .info = {
 104                 .name                   = "SHARP S921",
 105                 .type                   = FE_OFDM,
 106                 .frequency_min          = 473143000,
 107                 .frequency_max          = 767143000,
 108                 .frequency_stepsize     =   6000000,
 109                 .frequency_tolerance    = 0,
 110                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 111                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 112                         FE_CAN_FEC_AUTO |
 113                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 114                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 115                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 116                         FE_CAN_MUTE_TS
 117         },
 118         .init = s921_init,
 119         .sleep = s921_sleep,
 120         .set_frontend = s921_set_parameters,
 121         .read_snr = s921_read_snr,
 122         .read_ber = s921_read_ber,
 123         .read_status = s921_read_status,
 124         .read_ucblocks = s921_read_ucblocks,
 125         .release = s921_release,
 126 };
 127
 128 static int s921_write(void *dev, u8 reg, u8 val) {
 129         struct s921_state *state = dev;
 130         char buf[2]={reg,val};
 131         int err;
 132         struct i2c_msg i2cmsgs = {
 133                 .addr = state->addr,
 134                 .flags = 0,
 135                 .len = 2,
 136                 .buf = buf
 137         };
 138
 139         if((err = i2c_transfer(state->i2c, &i2cmsgs, 1))<0) {
 140                 printk("%s i2c_transfer error %d\n", __func__, err);
 141                 if (err < 0)
 142                         return err;
 143                 else
 144                         return -EREMOTEIO;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int s921_read(void *dev, u8 reg) {
 151         struct s921_state *state = dev;
 152         u8 b1;
 153         int ret;
 154         struct i2c_msg msg[2] = { { .addr = state->addr,
 155                                     .flags = 0,
 156                                     .buf = &reg, .len = 1 },
 157                                   { .addr = state->addr,
 158                                     .flags = I2C_M_RD,
 159                                     .buf = &b1, .len = 1 } };
 160
 161         ret = i2c_transfer(state->i2c, msg, 2);
 162         if (ret != 2)
 163                 return ret;
 164         return b1;
 165 }
 166
 167 struct dvb_frontend* s921_attach(const struct s921_config *config,
 168                                            struct i2c_adapter *i2c)
 169 {
 170
 171         struct s921_state *state;
 172         state = kzalloc(sizeof(struct s921_state), GFP_KERNEL);
 173         if (state == NULL)
 174                 return NULL;
 175
 176         state->addr = config->i2c_address;
 177         state->i2c = i2c;
 178         state->dev.i2c_write = &s921_write;
 179         state->dev.i2c_read = &s921_read;
 180         state->dev.priv_dev = state;
 181
 182         s921_isdb_cmd(&state->dev, ISDB_T_CMD_INIT, NULL);
 183
 184         memcpy(&state->frontend.ops, &demod_s921, sizeof(struct dvb_frontend_ops));
 185         state->frontend.demodulator_priv = state;
 186         return &state->frontend;
 187 }
 188
 189 EXPORT_SYMBOL_GPL(s921_attach);
 190 MODULE_AUTHOR("Markus Rechberger <mrechberger@empiatech.com>");
 191 MODULE_DESCRIPTION("Sharp S921 ISDB-T 1Seg");
 192 MODULE_LICENSE("GPL");