From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/media/dvb-frontends/au8522_common.c | 277 ++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) create mode 100644 drivers/media/dvb-frontends/au8522_common.c (limited to 'drivers/media/dvb-frontends/au8522_common.c') diff --git a/drivers/media/dvb-frontends/au8522_common.c b/drivers/media/dvb-frontends/au8522_common.c new file mode 100644 index 000000000..3559ff230 --- /dev/null +++ b/drivers/media/dvb-frontends/au8522_common.c @@ -0,0 +1,277 @@ +/* + Auvitek AU8522 QAM/8VSB demodulator driver + + Copyright (C) 2008 Steven Toth + Copyright (C) 2008 Devin Heitmueller + Copyright (C) 2005-2008 Auvitek International, Ltd. + Copyright (C) 2012 Michael Krufky + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include +#include "dvb_frontend.h" +#include "au8522_priv.h" + +static int debug; + +#define dprintk(arg...)\ + do { if (debug)\ + printk(arg);\ + } while (0) + +/* Despite the name "hybrid_tuner", the framework works just as well for + hybrid demodulators as well... */ +static LIST_HEAD(hybrid_tuner_instance_list); +static DEFINE_MUTEX(au8522_list_mutex); + +/* 16 bit registers, 8 bit values */ +int au8522_writereg(struct au8522_state *state, u16 reg, u8 data) +{ + int ret; + u8 buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; + + struct i2c_msg msg = { .addr = state->config->demod_address, + .flags = 0, .buf = buf, .len = 3 }; + + ret = i2c_transfer(state->i2c, &msg, 1); + + if (ret != 1) + printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, " + "ret == %i)\n", __func__, reg, data, ret); + + return (ret != 1) ? -1 : 0; +} +EXPORT_SYMBOL(au8522_writereg); + +u8 au8522_readreg(struct au8522_state *state, u16 reg) +{ + int ret; + u8 b0[] = { (reg >> 8) | 0x40, reg & 0xff }; + u8 b1[] = { 0 }; + + struct i2c_msg msg[] = { + { .addr = state->config->demod_address, .flags = 0, + .buf = b0, .len = 2 }, + { .addr = state->config->demod_address, .flags = I2C_M_RD, + .buf = b1, .len = 1 } }; + + ret = i2c_transfer(state->i2c, msg, 2); + + if (ret != 2) + printk(KERN_ERR "%s: readreg error (ret == %i)\n", + __func__, ret); + return b1[0]; +} +EXPORT_SYMBOL(au8522_readreg); + +int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) +{ + struct au8522_state *state = fe->demodulator_priv; + + dprintk("%s(%d)\n", __func__, enable); + + if (state->operational_mode == AU8522_ANALOG_MODE) { + /* We're being asked to manage the gate even though we're + not in digital mode. This can occur if we get switched + over to analog mode before the dvb_frontend kernel thread + has completely shutdown */ + return 0; + } + + if (enable) + return au8522_writereg(state, 0x106, 1); + else + return au8522_writereg(state, 0x106, 0); +} +EXPORT_SYMBOL(au8522_i2c_gate_ctrl); + +int au8522_analog_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) +{ + struct au8522_state *state = fe->demodulator_priv; + + dprintk("%s(%d)\n", __func__, enable); + + if (enable) + return au8522_writereg(state, 0x106, 1); + else + return au8522_writereg(state, 0x106, 0); +} +EXPORT_SYMBOL(au8522_analog_i2c_gate_ctrl); + +/* Reset the demod hardware and reset all of the configuration registers + to a default state. */ +int au8522_get_state(struct au8522_state **state, struct i2c_adapter *i2c, + u8 client_address) +{ + int ret; + + mutex_lock(&au8522_list_mutex); + ret = hybrid_tuner_request_state(struct au8522_state, (*state), + hybrid_tuner_instance_list, + i2c, client_address, "au8522"); + mutex_unlock(&au8522_list_mutex); + + return ret; +} +EXPORT_SYMBOL(au8522_get_state); + +void au8522_release_state(struct au8522_state *state) +{ + mutex_lock(&au8522_list_mutex); + if (state != NULL) + hybrid_tuner_release_state(state); + mutex_unlock(&au8522_list_mutex); +} +EXPORT_SYMBOL(au8522_release_state); + +static int au8522_led_gpio_enable(struct au8522_state *state, int onoff) +{ + struct au8522_led_config *led_config = state->config->led_cfg; + u8 val; + + /* bail out if we can't control an LED */ + if (!led_config || !led_config->gpio_output || + !led_config->gpio_output_enable || !led_config->gpio_output_disable) + return 0; + + val = au8522_readreg(state, 0x4000 | + (led_config->gpio_output & ~0xc000)); + if (onoff) { + /* enable GPIO output */ + val &= ~((led_config->gpio_output_enable >> 8) & 0xff); + val |= (led_config->gpio_output_enable & 0xff); + } else { + /* disable GPIO output */ + val &= ~((led_config->gpio_output_disable >> 8) & 0xff); + val |= (led_config->gpio_output_disable & 0xff); + } + return au8522_writereg(state, 0x8000 | + (led_config->gpio_output & ~0xc000), val); +} + +/* led = 0 | off + * led = 1 | signal ok + * led = 2 | signal strong + * led < 0 | only light led if leds are currently off + */ +int au8522_led_ctrl(struct au8522_state *state, int led) +{ + struct au8522_led_config *led_config = state->config->led_cfg; + int i, ret = 0; + + /* bail out if we can't control an LED */ + if (!led_config || !led_config->gpio_leds || + !led_config->num_led_states || !led_config->led_states) + return 0; + + if (led < 0) { + /* if LED is already lit, then leave it as-is */ + if (state->led_state) + return 0; + else + led *= -1; + } + + /* toggle LED if changing state */ + if (state->led_state != led) { + u8 val; + + dprintk("%s: %d\n", __func__, led); + + au8522_led_gpio_enable(state, 1); + + val = au8522_readreg(state, 0x4000 | + (led_config->gpio_leds & ~0xc000)); + + /* start with all leds off */ + for (i = 0; i < led_config->num_led_states; i++) + val &= ~led_config->led_states[i]; + + /* set selected LED state */ + if (led < led_config->num_led_states) + val |= led_config->led_states[led]; + else if (led_config->num_led_states) + val |= + led_config->led_states[led_config->num_led_states - 1]; + + ret = au8522_writereg(state, 0x8000 | + (led_config->gpio_leds & ~0xc000), val); + if (ret < 0) + return ret; + + state->led_state = led; + + if (led == 0) + au8522_led_gpio_enable(state, 0); + } + + return 0; +} +EXPORT_SYMBOL(au8522_led_ctrl); + +int au8522_init(struct dvb_frontend *fe) +{ + struct au8522_state *state = fe->demodulator_priv; + dprintk("%s()\n", __func__); + + state->operational_mode = AU8522_DIGITAL_MODE; + + /* Clear out any state associated with the digital side of the + chip, so that when it gets powered back up it won't think + that it is already tuned */ + state->current_frequency = 0; + + au8522_writereg(state, 0xa4, 1 << 5); + + au8522_i2c_gate_ctrl(fe, 1); + + return 0; +} +EXPORT_SYMBOL(au8522_init); + +int au8522_sleep(struct dvb_frontend *fe) +{ + struct au8522_state *state = fe->demodulator_priv; + dprintk("%s()\n", __func__); + + /* Only power down if the digital side is currently using the chip */ + if (state->operational_mode == AU8522_ANALOG_MODE) { + /* We're not in one of the expected power modes, which means + that the DVB thread is probably telling us to go to sleep + even though the analog frontend has already started using + the chip. So ignore the request */ + return 0; + } + + /* turn off led */ + au8522_led_ctrl(state, 0); + + /* Power down the chip */ + au8522_writereg(state, 0xa4, 1 << 5); + + state->current_frequency = 0; + + return 0; +} +EXPORT_SYMBOL(au8522_sleep); + +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Enable verbose debug messages"); + +MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver"); +MODULE_AUTHOR("Steven Toth"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3-54-g00ecf