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[media] a8293: Allegro A8293 SEC driver
Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Antti Palosaari
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Mauro Carvalho Chehab
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Sep 21, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| /* | ||
| * 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" | ||
|
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| #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) | ||
|
|
||
|
|
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| 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; | ||
| } | ||
|
|
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| 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); | ||
|
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| 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; | ||
| }; | ||
|
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| ret = a8293_wr(priv, &priv->reg[0], 1); | ||
| if (ret) | ||
| goto err; | ||
|
|
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| return ret; | ||
| err: | ||
| dbg("%s: failed=%d", __func__, ret); | ||
| return ret; | ||
| } | ||
|
|
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| static void a8293_release_sec(struct dvb_frontend *fe) | ||
| { | ||
| dbg("%s:", __func__); | ||
|
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| a8293_set_voltage(fe, SEC_VOLTAGE_OFF); | ||
|
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| kfree(fe->sec_priv); | ||
| fe->sec_priv = NULL; | ||
| } | ||
|
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| 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; | ||
|
|
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| /* check if the SEC is there */ | ||
| ret = a8293_rd(priv, buf, 2); | ||
| if (ret) | ||
| goto err; | ||
|
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| /* ENB=0 */ | ||
| priv->reg[0] = 0x10; | ||
| ret = a8293_wr(priv, &priv->reg[1], 1); | ||
| if (ret) | ||
| goto err; | ||
|
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| /* TMODE=0, TGATE=1 */ | ||
| priv->reg[1] = 0x82; | ||
| ret = a8293_wr(priv, &priv->reg[1], 1); | ||
| if (ret) | ||
| goto err; | ||
|
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| info("Allegro A8293 SEC attached."); | ||
|
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| fe->ops.release_sec = a8293_release_sec; | ||
|
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| /* override frontend ops */ | ||
| fe->ops.set_voltage = a8293_set_voltage; | ||
|
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| 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"); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
||
| #ifndef A8293_H | ||
| #define A8293_H | ||
|
|
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| struct a8293_config { | ||
| u8 i2c_addr; | ||
| }; | ||
|
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| #if defined(CONFIG_DVB_A8293) || \ | ||
| (defined(CONFIG_DVB_A8293_MODULE) && defined(MODULE)) | ||
| extern struct dvb_frontend *a8293_attach(struct dvb_frontend *fe, | ||
| struct i2c_adapter *i2c, const struct a8293_config *cfg); | ||
| #else | ||
| static inline struct dvb_frontend *a8293_attach(struct dvb_frontend *fe, | ||
| struct i2c_adapter *i2c, const struct a8293_config *cfg) | ||
| { | ||
| printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__); | ||
| return NULL; | ||
| } | ||
| #endif | ||
|
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||
| #endif /* A8293_H */ |