/* * Allegro A8293 SEC driver * * Copyright (C) 2011 Antti Palosaari <crope@iki.fi> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "dvb_frontend.h" #include "a8293.h" static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); #define LOG_PREFIX "a8293" #undef dbg #define dbg(f, arg...) \ if (debug) \ printk(KERN_INFO LOG_PREFIX": " f "\n" , ## arg) #undef err #define err(f, arg...) printk(KERN_ERR LOG_PREFIX": " f "\n" , ## arg) #undef info #define info(f, arg...) printk(KERN_INFO LOG_PREFIX": " f "\n" , ## arg) #undef warn #define warn(f, arg...) printk(KERN_WARNING LOG_PREFIX": " f "\n" , ## arg) struct a8293_priv { struct i2c_adapter *i2c; const struct a8293_config *cfg; u8 reg[2]; }; static int a8293_i2c(struct a8293_priv *priv, u8 *val, int len, bool rd) { int ret; struct i2c_msg msg[1] = { { .addr = priv->cfg->i2c_addr, .len = len, .buf = val, } }; if (rd) msg[0].flags = I2C_M_RD; else msg[0].flags = 0; ret = i2c_transfer(priv->i2c, msg, 1); if (ret == 1) { ret = 0; } else { warn("i2c failed=%d rd=%d", ret, rd); ret = -EREMOTEIO; } return ret; } static int a8293_wr(struct a8293_priv *priv, u8 *val, int len) { return a8293_i2c(priv, val, len, 0); } static int a8293_rd(struct a8293_priv *priv, u8 *val, int len) { return a8293_i2c(priv, val, len, 1); } static int a8293_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t fe_sec_voltage) { struct a8293_priv *priv = fe->sec_priv; int ret; dbg("%s: fe_sec_voltage=%d", __func__, fe_sec_voltage); switch (fe_sec_voltage) { case SEC_VOLTAGE_OFF: /* ENB=0 */ priv->reg[0] = 0x10; break; case SEC_VOLTAGE_13: /* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/ priv->reg[0] = 0x31; break; case SEC_VOLTAGE_18: /* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/ priv->reg[0] = 0x38; break; default: ret = -EINVAL; goto err; }; ret = a8293_wr(priv, &priv->reg[0], 1); if (ret) goto err; return ret; err: dbg("%s: failed=%d", __func__, ret); return ret; } static void a8293_release_sec(struct dvb_frontend *fe) { dbg("%s:", __func__); a8293_set_voltage(fe, SEC_VOLTAGE_OFF); kfree(fe->sec_priv); fe->sec_priv = NULL; } struct dvb_frontend *a8293_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, const struct a8293_config *cfg) { int ret; struct a8293_priv *priv = NULL; u8 buf[2]; /* allocate memory for the internal priv */ priv = kzalloc(sizeof(struct a8293_priv), GFP_KERNEL); if (priv == NULL) { ret = -ENOMEM; goto err; } /* setup the priv */ priv->i2c = i2c; priv->cfg = cfg; fe->sec_priv = priv; /* check if the SEC is there */ ret = a8293_rd(priv, buf, 2); if (ret) goto err; /* ENB=0 */ priv->reg[0] = 0x10; ret = a8293_wr(priv, &priv->reg[1], 1); if (ret) goto err; /* TMODE=0, TGATE=1 */ priv->reg[1] = 0x82; ret = a8293_wr(priv, &priv->reg[1], 1); if (ret) goto err; info("Allegro A8293 SEC attached."); fe->ops.release_sec = a8293_release_sec; /* override frontend ops */ fe->ops.set_voltage = a8293_set_voltage; return fe; err: dbg("%s: failed=%d", __func__, ret); kfree(priv); return NULL; } EXPORT_SYMBOL(a8293_attach); MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); MODULE_DESCRIPTION("Allegro A8293 SEC driver"); MODULE_LICENSE("GPL");