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+/*
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+ Auvitek AU8522 QAM/8VSB demodulator driver
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+
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+ Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
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+ Copyright (C) 2008 Devin Heitmueller <dheitmueller@linuxtv.org>
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+ Copyright (C) 2005-2008 Auvitek International, Ltd.
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+ Copyright (C) 2012 Michael Krufky <mkrufky@linuxtv.org>
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program; if not, write to the Free Software
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+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+
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+*/
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+
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+#include <linux/i2c.h>
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+#include "dvb_frontend.h"
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+#include "au8522_priv.h"
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+
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+static int debug;
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+
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+#define dprintk(arg...)\
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+ do { if (debug)\
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+ printk(arg);\
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+ } while (0)
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+
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+/* Despite the name "hybrid_tuner", the framework works just as well for
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+ hybrid demodulators as well... */
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+static LIST_HEAD(hybrid_tuner_instance_list);
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+static DEFINE_MUTEX(au8522_list_mutex);
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+
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+/* 16 bit registers, 8 bit values */
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+int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
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+{
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+ int ret;
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+ u8 buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
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+
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+ struct i2c_msg msg = { .addr = state->config->demod_address,
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+ .flags = 0, .buf = buf, .len = 3 };
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+
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+ ret = i2c_transfer(state->i2c, &msg, 1);
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+
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+ if (ret != 1)
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+ printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
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+ "ret == %i)\n", __func__, reg, data, ret);
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+
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+ return (ret != 1) ? -1 : 0;
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+}
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+EXPORT_SYMBOL(au8522_writereg);
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+
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+u8 au8522_readreg(struct au8522_state *state, u16 reg)
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+{
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+ int ret;
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+ u8 b0[] = { (reg >> 8) | 0x40, reg & 0xff };
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+ u8 b1[] = { 0 };
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+
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+ struct i2c_msg msg[] = {
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+ { .addr = state->config->demod_address, .flags = 0,
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+ .buf = b0, .len = 2 },
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+ { .addr = state->config->demod_address, .flags = I2C_M_RD,
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+ .buf = b1, .len = 1 } };
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+
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+ ret = i2c_transfer(state->i2c, msg, 2);
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+
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+ if (ret != 2)
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+ printk(KERN_ERR "%s: readreg error (ret == %i)\n",
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+ __func__, ret);
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+ return b1[0];
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+}
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+EXPORT_SYMBOL(au8522_readreg);
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+
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+int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
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+{
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+ struct au8522_state *state = fe->demodulator_priv;
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+
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+ dprintk("%s(%d)\n", __func__, enable);
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+
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+ if (state->operational_mode == AU8522_ANALOG_MODE) {
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+ /* We're being asked to manage the gate even though we're
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+ not in digital mode. This can occur if we get switched
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+ over to analog mode before the dvb_frontend kernel thread
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+ has completely shutdown */
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+ return 0;
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+ }
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+
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+ if (enable)
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+ return au8522_writereg(state, 0x106, 1);
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+ else
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+ return au8522_writereg(state, 0x106, 0);
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+}
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+EXPORT_SYMBOL(au8522_i2c_gate_ctrl);
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+
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+/* Reset the demod hardware and reset all of the configuration registers
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+ to a default state. */
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+int au8522_get_state(struct au8522_state **state, struct i2c_adapter *i2c,
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+ u8 client_address)
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+{
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+ int ret;
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+
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+ mutex_lock(&au8522_list_mutex);
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+ ret = hybrid_tuner_request_state(struct au8522_state, (*state),
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+ hybrid_tuner_instance_list,
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+ i2c, client_address, "au8522");
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+ mutex_unlock(&au8522_list_mutex);
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+
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+ return ret;
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+}
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+EXPORT_SYMBOL(au8522_get_state);
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+
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+void au8522_release_state(struct au8522_state *state)
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+{
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+ mutex_lock(&au8522_list_mutex);
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+ if (state != NULL)
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+ hybrid_tuner_release_state(state);
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+ mutex_unlock(&au8522_list_mutex);
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+}
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+EXPORT_SYMBOL(au8522_release_state);
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+
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+int au8522_led_gpio_enable(struct au8522_state *state, int onoff)
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+{
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+ struct au8522_led_config *led_config = state->config->led_cfg;
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+ u8 val;
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+
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+ /* bail out if we can't control an LED */
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+ if (!led_config || !led_config->gpio_output ||
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+ !led_config->gpio_output_enable || !led_config->gpio_output_disable)
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+ return 0;
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+
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+ val = au8522_readreg(state, 0x4000 |
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+ (led_config->gpio_output & ~0xc000));
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+ if (onoff) {
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+ /* enable GPIO output */
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+ val &= ~((led_config->gpio_output_enable >> 8) & 0xff);
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+ val |= (led_config->gpio_output_enable & 0xff);
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+ } else {
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+ /* disable GPIO output */
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+ val &= ~((led_config->gpio_output_disable >> 8) & 0xff);
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+ val |= (led_config->gpio_output_disable & 0xff);
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+ }
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+ return au8522_writereg(state, 0x8000 |
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+ (led_config->gpio_output & ~0xc000), val);
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+}
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+EXPORT_SYMBOL(au8522_led_gpio_enable);
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+
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+/* led = 0 | off
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+ * led = 1 | signal ok
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+ * led = 2 | signal strong
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+ * led < 0 | only light led if leds are currently off
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+ */
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+int au8522_led_ctrl(struct au8522_state *state, int led)
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+{
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+ struct au8522_led_config *led_config = state->config->led_cfg;
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+ int i, ret = 0;
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+
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+ /* bail out if we can't control an LED */
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+ if (!led_config || !led_config->gpio_leds ||
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+ !led_config->num_led_states || !led_config->led_states)
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+ return 0;
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+
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+ if (led < 0) {
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+ /* if LED is already lit, then leave it as-is */
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+ if (state->led_state)
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+ return 0;
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+ else
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+ led *= -1;
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+ }
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+
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+ /* toggle LED if changing state */
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+ if (state->led_state != led) {
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+ u8 val;
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+
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+ dprintk("%s: %d\n", __func__, led);
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+
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+ au8522_led_gpio_enable(state, 1);
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+
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+ val = au8522_readreg(state, 0x4000 |
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+ (led_config->gpio_leds & ~0xc000));
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+
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+ /* start with all leds off */
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+ for (i = 0; i < led_config->num_led_states; i++)
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+ val &= ~led_config->led_states[i];
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+
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+ /* set selected LED state */
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+ if (led < led_config->num_led_states)
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+ val |= led_config->led_states[led];
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+ else if (led_config->num_led_states)
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+ val |=
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+ led_config->led_states[led_config->num_led_states - 1];
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+
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+ ret = au8522_writereg(state, 0x8000 |
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+ (led_config->gpio_leds & ~0xc000), val);
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+ if (ret < 0)
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+ return ret;
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+
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+ state->led_state = led;
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+
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+ if (led == 0)
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+ au8522_led_gpio_enable(state, 0);
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(au8522_led_ctrl);
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+
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+int au8522_init(struct dvb_frontend *fe)
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+{
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+ struct au8522_state *state = fe->demodulator_priv;
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+ dprintk("%s()\n", __func__);
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+
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+ state->operational_mode = AU8522_DIGITAL_MODE;
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+
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+ /* Clear out any state associated with the digital side of the
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+ chip, so that when it gets powered back up it won't think
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+ that it is already tuned */
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+ state->current_frequency = 0;
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+
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+ au8522_writereg(state, 0xa4, 1 << 5);
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+
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+ au8522_i2c_gate_ctrl(fe, 1);
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(au8522_init);
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+
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+int au8522_sleep(struct dvb_frontend *fe)
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+{
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+ struct au8522_state *state = fe->demodulator_priv;
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+ dprintk("%s()\n", __func__);
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+
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+ /* Only power down if the digital side is currently using the chip */
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+ if (state->operational_mode == AU8522_ANALOG_MODE) {
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+ /* We're not in one of the expected power modes, which means
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+ that the DVB thread is probably telling us to go to sleep
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+ even though the analog frontend has already started using
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+ the chip. So ignore the request */
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+ return 0;
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+ }
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+
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+ /* turn off led */
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+ au8522_led_ctrl(state, 0);
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+
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+ /* Power down the chip */
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+ au8522_writereg(state, 0xa4, 1 << 5);
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+
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+ state->current_frequency = 0;
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(au8522_sleep);
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Michael Krufky