1 files changed, 259 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/au8522_common.c b/drivers/media/dvb/frontends/au8522_common.c
new file mode 100644
index 000000000000..5cfe151ee394
--- /dev/null
+++ b/drivers/media/dvb/frontends/au8522_common.c
@@ -0,0 +1,259 @@
+/*
+    Auvitek AU8522 QAM/8VSB demodulator driver
+
+    Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
+    Copyright (C) 2008 Devin Heitmueller <dheitmueller@linuxtv.org>
+    Copyright (C) 2005-2008 Auvitek International, Ltd.
+    Copyright (C) 2012 Michael Krufky <mkrufky@linuxtv.org>
+
+    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 <linux/i2c.h>
+#include "dvb_frontend.h"
+#include "au8522_priv.h"
+
+MODULE_LICENSE("GPL");
+
+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);
+
+/* 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);