V4L/DVB (9149): hvr950q: led feedback based on snr
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/frontends/au8522.c b/drivers/media/dvb/frontends/au8522.c
index 0b82cc2..eabf9a6 100644
--- a/drivers/media/dvb/frontends/au8522.c
+++ b/drivers/media/dvb/frontends/au8522.c
@@ -40,6 +40,8 @@
u32 current_frequency;
fe_modulation_t current_modulation;
+ u32 fe_status;
+ unsigned int led_state;
};
static int debug;
@@ -538,11 +540,98 @@
return 0;
}
+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 cant 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
+ */
+static 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 cant 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;
+}
+
static int au8522_sleep(struct dvb_frontend *fe)
{
struct au8522_state *state = fe->demodulator_priv;
dprintk("%s()\n", __func__);
+ /* turn off led */
+ au8522_led_ctrl(state, 0);
+
state->current_frequency = 0;
return 0;
@@ -592,12 +681,53 @@
*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
break;
}
+ state->fe_status = *status;
+
+ if (*status & FE_HAS_LOCK)
+ /* turn on LED, if it isn't on already */
+ au8522_led_ctrl(state, -1);
+ else
+ /* turn off LED */
+ au8522_led_ctrl(state, 0);
dprintk("%s() status 0x%08x\n", __func__, *status);
return 0;
}
+static int au8522_led_status(struct au8522_state *state, const u16 *snr)
+{
+ struct au8522_led_config *led_config = state->config->led_cfg;
+ int led;
+ u16 strong;
+
+ /* bail out if we cant control an LED */
+ if (!led_config)
+ return 0;
+
+ if (0 == (state->fe_status & FE_HAS_LOCK))
+ return au8522_led_ctrl(state, 0);
+ else if (state->current_modulation == QAM_256)
+ strong = led_config->qam256_strong;
+ else if (state->current_modulation == QAM_64)
+ strong = led_config->qam64_strong;
+ else /* (state->current_modulation == VSB_8) */
+ strong = led_config->vsb8_strong;
+
+ if (*snr >= strong)
+ led = 2;
+ else
+ led = 1;
+
+ if ((state->led_state) &&
+ (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
+ /* snr didn't change enough to bother
+ * changing the color of the led */
+ return 0;
+
+ return au8522_led_ctrl(state, led);
+}
+
static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct au8522_state *state = fe->demodulator_priv;
@@ -621,6 +751,9 @@
au8522_readreg(state, 0x4311),
snr);
+ if (state->config->led_cfg)
+ au8522_led_status(state, snr);
+
return ret;
}