lkml.org 
[lkml]   [2012]   [Sep]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] Add a V4L2 driver for SI476X MFD
Date
This commit adds a driver that exposes all the radio related
functionality of the Si476x series of chips via the V4L2 subsystem.

Signed-off-by: Andrey Smirnov <andrey.smirnov@convergeddevices.net>
---
drivers/media/radio/Kconfig | 17 +
drivers/media/radio/radio-si476x.c | 1307 ++++++++++++++++++++++++++++++++++++
2 files changed, 1324 insertions(+)
create mode 100644 drivers/media/radio/radio-si476x.c

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index 8090b87..3c79d09 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -16,6 +16,23 @@ config RADIO_SI470X
bool "Silicon Labs Si470x FM Radio Receiver support"
depends on VIDEO_V4L2

+config RADIO_SI476X
+ tristate "Silicon Laboratories Si476x I2C FM Radio"
+ depends on I2C && VIDEO_V4L2
+ select MFD_CORE
+ select MFD_SI476X_CORE
+ select SND_SOC_SI476X
+ ---help---
+ Choose Y here if you have this FM radio chip.
+
+ In order to control your radio card, you will need to use programs
+ that are compatible with the Video For Linux 2 API. Information on
+ this API and pointers to "v4l2" programs may be found at
+ <file:Documentation/video4linux/API.html>.
+
+ To compile this driver as a module, choose M here: the
+ module will be called radio-si476x.
+
source "drivers/media/radio/si470x/Kconfig"

config USB_MR800
diff --git a/drivers/media/radio/radio-si476x.c b/drivers/media/radio/radio-si476x.c
new file mode 100644
index 0000000..f313005
--- /dev/null
+++ b/drivers/media/radio/radio-si476x.c
@@ -0,0 +1,1307 @@
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+
+#include <linux/mfd/si476x-core.h>
+
+#define FM_FREQ_RANGE_LOW 64000000
+#define FM_FREQ_RANGE_HIGH 108000000
+
+#define AM_FREQ_RANGE_LOW 520000
+#define AM_FREQ_RANGE_HIGH 30000000
+
+#define PWRLINEFLTR (1 << 8)
+
+#define FREQ_MUL (10000000 / 625)
+
+#define DRIVER_NAME "si476x-radio"
+#define DRIVER_CARD "SI476x AM/FM Receiver"
+
+static const char * const deemphasis[] = {
+ "75 us",
+ "50 us",
+};
+
+static const char * const grid_frequency[] = {
+ "50 Hz",
+ "60 Hz",
+};
+
+#define PRIVATE_CTL_IDX(x) (x - V4L2_CID_PRIVATE_BASE)
+
+static const struct v4l2_queryctrl si476x_ctrls[] = {
+ /*
+ Tuning parameters
+ 'max tune errors' is shared for both AM/FM mode of operation
+ */
+ {
+ .id = SI476X_CID_RSSI_THRESHOLD,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "valid rssi threshold",
+ .minimum = -128,
+ .maximum = 127,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_SNR_THRESHOLD,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "valid snr threshold",
+ .minimum = -128,
+ .maximum = 127,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_MAX_TUNE_ERROR,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "max tune errors",
+ .minimum = 0,
+ .maximum = 126 * 2,
+ .step = 2,
+ },
+ /*
+ Region specific parameters
+ */
+ {
+ .id = SI476X_CID_GRID_FREQUENCY,
+ .type = V4L2_CTRL_TYPE_MENU,
+ .name = "power grid frequency",
+ .minimum = 0,
+ .maximum = ARRAY_SIZE(grid_frequency) - 1,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_HARMONICS_COUNT,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "# of harmonics to reject",
+ .minimum = 0,
+ .maximum = 20,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_SEEK_SPACING,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "seek frequency spacing",
+ .minimum = 0,
+ .maximum = 0xFFFF,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_SEEK_BAND_TOP,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "seek band top",
+ .minimum = 0,
+ .maximum = 0xFFFF,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_SEEK_BAND_BOTTOM,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "seek band bottom",
+ .minimum = 0,
+ .maximum = 0xFFFF,
+ .step = 1,
+ },
+ {
+ .id = SI476X_CID_DEEMPHASIS,
+ .type = V4L2_CTRL_TYPE_MENU,
+ .name = "de-emphassis",
+ .minimum = 0,
+ .maximum = ARRAY_SIZE(deemphasis) - 1,
+ .step = 1,
+ .default_value = 0,
+ },
+ {
+ .id = SI476X_CID_RDS_RECEPTION,
+ .type = V4L2_CTRL_TYPE_BOOLEAN,
+ .name = "rds",
+ .minimum = 0,
+ .maximum = 1,
+ },
+};
+
+struct si476x_radio;
+
+/**
+ * struct si476x_radio_ops - vtable of tuner functions
+ *
+ * This table holds pointers to functions implementing particular
+ * operations depending on the mode in which the tuner chip was
+ * configured to start in. If the function is not supported
+ * corresponding element is set to #NULL.
+ *
+ * @tune_freq: Tune chip to a specific frequency
+ * @seek_start: Star station seeking
+ * @rsq_status: Get Recieved Signal Quality(RSQ) status
+ * @rds_blckcnt: Get recived RDS blocks count
+ * @phase_diversity: Change phase diversity mode of the tuner
+ * @phase_div_status: Get phase diversity mode status
+ * @acf_status: Get the status of Automatically Controlled
+ * Features(ACF)
+ * @agc_status: Get Automatic Gain Control(AGC) status
+ */
+struct si476x_radio_ops {
+ int (*tune_freq)(struct si476x_core *, struct si476x_tune_freq_args *);
+ int (*seek_start)(struct si476x_core *, bool, bool);
+ int (*rsq_status)(struct si476x_core *, struct si476x_rsq_status_args *,
+ struct si476x_rsq_status_report *);
+ int (*rds_blckcnt)(struct si476x_core *, bool,
+ struct si476x_rds_blockcount_report *);
+
+ int (*phase_diversity)(struct si476x_core *,
+ enum si476x_phase_diversity_mode);
+ int (*phase_div_status)(struct si476x_core *);
+ int (*acf_status)(struct si476x_core *,
+ struct si476x_acf_status_report *);
+ int (*agc_status)(struct si476x_core *,
+ struct si476x_agc_status_report *);
+};
+
+/**
+ * struct si476x_radio - radio device
+ *
+ * @core: Pointer to underlying core device
+ * @videodev: Pointer to video device created by V4L2 subsystem
+ * @ops: Vtable of functions. See struct si476x_radio_ops for details
+ * @kref: Reference counter
+ * @core_lock: An r/w semaphore to brebvent the deletion of underlying
+ * core structure is the radio device is being used
+ */
+struct si476x_radio {
+ struct si476x_core *core;
+ struct video_device *videodev;
+
+ /* This field should not be accesses unless core lock is held */
+ const struct si476x_radio_ops *ops;
+
+ struct kref kref;
+ struct rw_semaphore core_lock;
+};
+static inline struct si476x_radio *kref_to_si476x_radio(struct kref *ref)
+{
+ return container_of(ref, struct si476x_radio, kref);
+}
+
+static void si476x_radio_delete(struct kref *kref);
+static inline void si476x_radio_get(struct si476x_radio *radio)
+{
+ kref_get(&radio->kref);
+}
+
+static inline void si476x_radio_put(struct si476x_radio *radio)
+{
+ kref_put(&radio->kref, si476x_radio_delete);
+}
+
+
+static int si476x_radio_initialize_mode(struct si476x_radio *);
+
+/*
+ * si476x_vidioc_querycap - query device capabilities
+ */
+static int si476x_querycap(struct file *file, void *priv,
+ struct v4l2_capability *capability)
+{
+ strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+ strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
+ capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
+ V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+
+ return 0;
+}
+
+static int si476x_queryctrl(struct file *file, void *priv,
+ struct v4l2_queryctrl *qc)
+{
+ int retval;
+
+ /* search video control */
+ switch (qc->id) {
+ case SI476X_CID_RSSI_THRESHOLD:
+ case SI476X_CID_SNR_THRESHOLD:
+ case SI476X_CID_MAX_TUNE_ERROR:
+ case SI476X_CID_SEEK_SPACING:
+ case SI476X_CID_SEEK_BAND_TOP:
+ case SI476X_CID_SEEK_BAND_BOTTOM:
+ case SI476X_CID_RDS_RECEPTION:
+ case SI476X_CID_HARMONICS_COUNT:
+ case SI476X_CID_GRID_FREQUENCY:
+ case SI476X_CID_DEEMPHASIS:
+ memcpy(qc, &si476x_ctrls[PRIVATE_CTL_IDX(qc->id)],
+ sizeof(*qc));
+ retval = 0;
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ return retval;
+}
+
+static int si476x_querymenu(struct file *file, void *fh,
+ struct v4l2_querymenu *m)
+{
+ switch (m->id) {
+ case SI476X_CID_GRID_FREQUENCY:
+ if (m->index > ARRAY_SIZE(grid_frequency) - 1)
+ return -EINVAL;
+ strncpy(m->name, grid_frequency[m->index], sizeof(m->name));
+ break;
+ case SI476X_CID_DEEMPHASIS:
+ if (m->index > ARRAY_SIZE(deemphasis) - 1)
+ return -EINVAL;
+ strncpy(m->name, deemphasis[m->index], sizeof(m->name));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* si4713_g_ctrl - get the value of a control */
+static int si476x_g_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ int retval;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ retval = -ENODEV;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+
+ switch (ctrl->id) {
+ case SI476X_CID_RSSI_THRESHOLD:
+ retval = si476x_core_get_valid_rssi_threshold(radio->core);
+ break;
+ case SI476X_CID_SNR_THRESHOLD:
+ retval = si476x_core_get_valid_snr_threshold(radio->core);
+ break;
+ case SI476X_CID_MAX_TUNE_ERROR:
+ retval = si476x_core_get_valid_max_tune_error(radio->core);
+ break;
+ case SI476X_CID_SEEK_SPACING:
+ retval = si476x_core_get_frequency_spacing(radio->core);
+ break;
+ case SI476X_CID_SEEK_BAND_TOP:
+ retval = si476x_core_get_seek_band_top(radio->core);
+ break;
+ case SI476X_CID_SEEK_BAND_BOTTOM:
+ retval = si476x_core_get_seek_band_bottom(radio->core);
+ break;
+ case SI476X_CID_RDS_RECEPTION:
+ retval = si476x_core_get_rds_reception(radio->core);
+ break;
+ case SI476X_CID_DEEMPHASIS:
+ retval = si476x_core_get_audio_deemphasis(radio->core);
+ break;
+ case SI476X_CID_HARMONICS_COUNT:
+ retval = si476x_core_get_audio_pwr_line_filter(radio->core);
+ break;
+ case SI476X_CID_GRID_FREQUENCY:
+ retval = si476x_core_get_audio_pwr_line_filter(radio->core);
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ if (retval >= 0) {
+ if (ctrl->id == SI476X_CID_HARMONICS_COUNT)
+ ctrl->value = retval & 0x0F;
+ else if (ctrl->id == SI476X_CID_GRID_FREQUENCY)
+ ctrl->value = !!(PWRLINEFLTR & retval);
+ else
+ ctrl->value = retval;
+
+ retval = 0;
+ }
+ si476x_core_unlock(radio->core);
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return retval;
+}
+
+/* si4713_s_ctrl - set the value of a control */
+static int si476x_s_ctrl(struct file *file, void *priv,
+ struct v4l2_control *ctrl)
+{
+ int old_value, retval, count;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ retval = -ENODEV;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+
+ switch (ctrl->id) {
+ case SI476X_CID_RSSI_THRESHOLD:
+ retval = si476x_core_set_valid_rssi_threshold(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_SNR_THRESHOLD:
+ retval = si476x_core_set_valid_snr_threshold(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_MAX_TUNE_ERROR:
+ retval = si476x_core_set_valid_max_tune_error(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_SEEK_SPACING:
+ retval = si476x_core_set_frequency_spacing(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_SEEK_BAND_TOP:
+ retval = si476x_core_set_seek_band_top(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_SEEK_BAND_BOTTOM:
+ retval = si476x_core_set_seek_band_bottom(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_RDS_RECEPTION:
+ retval = si476x_core_set_rds_reception(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_DEEMPHASIS:
+ retval = si476x_core_set_audio_deemphasis(radio->core,
+ ctrl->value);
+ break;
+ case SI476X_CID_HARMONICS_COUNT:
+ old_value = si476x_core_get_audio_pwr_line_filter(radio->core);
+ if (old_value < 0) {
+ retval = old_value;
+ break;
+ }
+
+ retval = si476x_core_set_audio_pwr_line_filter(radio->core,
+ (ctrl->value > 0) ? true : false,
+ !!(PWRLINEFLTR & old_value),
+ ctrl->value);
+ break;
+ case SI476X_CID_GRID_FREQUENCY:
+ old_value = si476x_core_get_audio_pwr_line_filter(radio->core);
+ if (old_value < 0) {
+ retval = old_value;
+ break;
+ }
+ count = old_value & 0x0F;
+
+ retval = si476x_core_set_audio_pwr_line_filter(radio->core,
+ (count > 0) ? true : false,
+ ctrl->value,
+ count);
+ break;
+ default:
+ retval = -EINVAL;
+ break;
+ }
+
+ si476x_core_unlock(radio->core);
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return retval;
+}
+
+static int si476x_g_tuner(struct file *file, void *priv,
+ struct v4l2_tuner *tuner)
+{
+ int err;
+ struct si476x_rsq_status_report report;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ if (tuner->index != 0) {
+ err = -EINVAL;
+ goto exit;
+ }
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ tuner->type = V4L2_TUNER_RADIO;
+ tuner->capability = V4L2_TUNER_CAP_LOW; /* Measure frequncies
+ * in multiples of
+ * 62.5 Hz */
+ if (radio->core->chip_id < 5) { /* Si4760/61/62/63/64 */
+ strlcpy(tuner->name, "AM/FM", sizeof(tuner->name));
+
+ tuner->capability |= V4L2_TUNER_CAP_STEREO
+ | V4L2_TUNER_CAP_RDS
+ | V4L2_TUNER_CAP_RDS_BLOCK_IO;
+
+ tuner->rangelow = 520 * FREQ_MUL / 1000;
+
+ tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+ tuner->audmode = V4L2_TUNER_MODE_STEREO;
+ } else { /* Si4768/69 */
+ strlcpy(tuner->name, "FM", sizeof(tuner->name));
+ tuner->rangelow = 64 * FREQ_MUL;
+ tuner->capability |= V4L2_TUNER_CAP_RDS
+ | V4L2_TUNER_CAP_RDS_BLOCK_IO;
+ }
+
+ tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
+
+
+ if (radio->core->diversity_mode == SI476X_PHDIV_SECONDARY_ANTENNA ||
+ radio->core->diversity_mode == SI476X_PHDIV_SECONDARY_COMBINING) {
+ strlcpy(tuner->name, "FM (secondary)", sizeof(tuner->name));
+ tuner->capability = 0;
+ tuner->rxsubchans = 0;
+ tuner->audmode = 0;
+ }
+
+ if (radio->core->diversity_mode == SI476X_PHDIV_PRIMARY_ANTENNA ||
+ radio->core->diversity_mode == SI476X_PHDIV_PRIMARY_COMBINING)
+ strlcpy(tuner->name, "AM/FM (primary)", sizeof(tuner->name));
+
+ tuner->rangehigh = 108 * FREQ_MUL;
+ tuner->afc = 1;
+
+ si476x_core_lock(radio->core);
+ {
+ struct si476x_rsq_status_args args = {
+ .primary = false,
+ .rsqack = false,
+ .attune = false,
+ .cancel = false,
+ .stcack = false,
+ };
+ if (radio->ops->rsq_status) {
+ err = radio->ops->rsq_status(radio->core,
+ &args, &report);
+ if (err < 0) {
+ tuner->signal = 0;
+ } else {
+ /*
+ tuner->signal value range: 0x0000 .. 0xFFFF,
+ report.rssi: -128 .. 127
+ */
+ tuner->signal = (report.rssi + 128) * 257;
+ }
+ } else {
+ tuner->signal = 0;
+ err = -EINVAL;
+ }
+ }
+ si476x_core_unlock(radio->core);
+
+up_semaphore:
+ up_read(&radio->core_lock);
+exit:
+ return err;
+}
+
+/**
+ * The switching between AM/FM mode of the tuner is implemented as
+ * swtiching between tow audio stream of the V4L2 tuner. SO each AM/FM
+ * capabel chips reports two audio streams "AM Radio" and "FM Radio".
+ * Selectio=ng one or the other would put hte tuner in an appropriate
+ * mode.
+ */
+
+static int si476x_enumaudio(struct file *file, void *fh,
+ struct v4l2_audio *audio)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ if (radio->core->chip_id >= 5) {
+ err = -EINVAL;
+ goto up_semaphore;
+ }
+
+ err = 0;
+ switch (audio->index) {
+ case 0:
+ strcpy(audio->name, "FM Radio");
+ audio->capability = V4L2_AUDCAP_STEREO;
+ audio->mode = 0;
+ break;
+ case 1:
+ strcpy(audio->name, "AM Radio");
+ audio->capability = 0;
+ audio->mode = 0;
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_g_audio(struct file *file, void *priv,
+ struct v4l2_audio *audio)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ if (radio->core->chip_id >= 5) {
+ err = -EINVAL;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+ err = 0;
+ switch (radio->core->power_up_parameters.func) {
+ case SI476X_FUNC_FM_RECEIVER:
+ audio->index = 0;
+ strcpy(audio->name, "FM Radio");
+ audio->capability = V4L2_AUDCAP_STEREO;
+ break;
+ case SI476X_FUNC_AM_RECEIVER:
+ audio->index = 1;
+ strcpy(audio->name, "AM Radio");
+ audio->capability = 0;
+ break;
+ default:
+ err = -EINVAL;
+ goto unlock;
+ }
+ audio->mode = 0;
+unlock:
+ si476x_core_unlock(radio->core);
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_s_audio(struct file *file, void *priv,
+ struct v4l2_audio *audio)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ if (radio->core->chip_id >= 5 || audio->index > 1) {
+ err = -EINVAL;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+
+ /*
+ Since power/up down is a very time consuming operation,
+ try to avoid doing it if the requested mode matches the one
+ the tuner is in
+ */
+ if ((audio->index == 0 &&
+ radio->core->power_up_parameters.func
+ == SI476X_FUNC_FM_RECEIVER) ||
+ (audio->index == 1 &&
+ radio->core->power_up_parameters.func
+ == SI476X_FUNC_AM_RECEIVER)) {
+ err = 0;
+ goto unlock;
+ }
+
+ err = si476x_core_stop(radio->core, true);
+ if (err < 0)
+ goto unlock;
+
+ switch (audio->index) {
+ case 0:
+ radio->core->power_up_parameters.func = SI476X_FUNC_FM_RECEIVER;
+ break;
+ case 1:
+ radio->core->power_up_parameters.func = SI476X_FUNC_AM_RECEIVER;
+ break;
+ }
+
+ err = si476x_core_start(radio->core, true);
+ if (!err)
+ err = si476x_radio_initialize_mode(radio);
+
+unlock:
+ si476x_core_unlock(radio->core);
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_g_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+
+ f->type = V4L2_TUNER_RADIO;
+ if (radio->ops->rsq_status) {
+ struct si476x_rsq_status_report report;
+ struct si476x_rsq_status_args args = {
+ .primary = false,
+ .rsqack = false,
+ .attune = true,
+ .cancel = false,
+ .stcack = false,
+ };
+
+ err = radio->ops->rsq_status(radio->core, &args, &report);
+ if (!err)
+ f->frequency = si476x_to_v4l2(radio->core,
+ report.readfreq);
+ } else {
+ err = -EINVAL;
+ }
+
+ si476x_core_unlock(radio->core);
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_s_frequency(struct file *file, void *priv,
+ struct v4l2_frequency *f)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+ si476x_core_lock(radio->core);
+
+ switch (radio->core->power_up_parameters.func) {
+ case SI476X_FUNC_FM_RECEIVER:
+ /* FIXME change teh constants to use Hz */
+ if (v4l2_to_hz(f->frequency) < FM_FREQ_RANGE_LOW ||
+ v4l2_to_hz(f->frequency) > FM_FREQ_RANGE_HIGH) {
+ err = -EDOM;
+ goto unlock;
+ }
+ break;
+ case SI476X_FUNC_AM_RECEIVER:
+ if (v4l2_to_hz(f->frequency) < AM_FREQ_RANGE_LOW ||
+ v4l2_to_hz(f->frequency) > AM_FREQ_RANGE_HIGH) {
+ err = -EDOM;
+ goto unlock;
+ }
+ break;
+ case SI476X_FUNC_WB_RECEIVER:
+ case SI476X_FUNC_BOOTLOADER:
+ break;
+ }
+
+ if (radio->ops->tune_freq) {
+ struct si476x_tune_freq_args args = {
+ .zifsr = false,
+ .hd = false,
+ .injside = SI476X_INJSIDE_AUTO,
+ .freq = v4l2_to_si476x(radio->core,
+ f->frequency),
+ .tunemode = SI476X_SM_INITIALIZE_AUDIO,
+ .smoothmetrics = SI476X_TM_VALIDATED_NORMAL_TUNE,
+ .antcap = 0,
+ };
+ err = radio->ops->tune_freq(radio->core, &args);
+ } else {
+ err = -ENOTSUPP;
+ }
+
+unlock:
+ si476x_core_unlock(radio->core);
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_s_hw_freq_seek(struct file *file, void *priv,
+ struct v4l2_hw_freq_seek *seek)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+ /* FIXME: Add seek->spacing support */
+ si476x_core_lock(radio->core);
+ if (radio->ops->seek_start)
+ err = radio->ops->seek_start(radio->core,
+ seek->seek_upward,
+ seek->wrap_around);
+ else
+ err = -ENOTSUPP;
+ si476x_core_unlock(radio->core);
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int __g_register(struct file *file, void *fh,
+ struct v4l2_dbg_register *reg)
+{
+ struct si476x_radio *radio = video_drvdata(file);
+
+ if (si476x_core_is_valid_property(radio->core, reg->reg)) {
+ reg->size = 2;
+ reg->val = si476x_core_cmd_get_property(radio->core, reg->reg);
+ return (reg->val < 0) ? reg->val : 0;
+ } else {
+ return -EINVAL;
+ }
+}
+
+static int __s_register(struct file *file, void *fh,
+ struct v4l2_dbg_register *reg)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ if (si476x_core_is_valid_property(radio->core, reg->reg) &&
+ !si476x_core_is_readonly_property(radio->core, reg->reg)) {
+ err = si476x_core_cmd_set_property(radio->core,
+ reg->reg, reg->val);
+ } else {
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int si476x_g_register(struct file *file, void *fh,
+ struct v4l2_dbg_register *reg)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ } else {
+ si476x_core_lock(radio->core);
+ err = __g_register(file, fh, reg);
+ si476x_core_unlock(radio->core);
+ }
+
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static int si476x_s_register(struct file *file, void *fh,
+ struct v4l2_dbg_register *reg)
+{
+
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ } else {
+ si476x_core_lock(radio->core);
+ err = __s_register(file, fh, reg);
+ si476x_core_unlock(radio->core);
+ }
+
+ up_read(&radio->core_lock);
+ return err;
+}
+#endif
+
+static long si476x_default(struct file *file, void *fh,
+ bool valid_prio, int cmd, void *arg)
+{
+ long rval;
+ struct si476x_rsq_status_args args = {
+ .primary = false,
+ .rsqack = false,
+ .attune = false,
+ .cancel = false,
+ .stcack = false,
+ };
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+ if (!radio->core) {
+ rval = -ENODEV;
+ goto up_semaphore;
+ }
+
+ si476x_core_lock(radio->core);
+ switch (cmd) {
+ case SI476X_IOC_GET_RSQ_PRIMARY:
+ args.primary = true;
+ case SI476X_IOC_GET_RSQ: /* FALLTHROUG */
+ if (radio->ops->rsq_status)
+ rval = radio->ops->rsq_status(radio->core, &args,
+ (struct si476x_rsq_status_report *) arg);
+ else
+ rval = -ENOTTY;
+ break;
+ case SI476X_IOC_SET_PHDIV_MODE:
+ if (radio->ops->phase_diversity)
+ rval = radio->ops->phase_diversity(radio->core,
+ *((enum si476x_phase_diversity_mode *) arg));
+ else
+ rval = -ENOTTY;
+ break;
+ case SI476X_IOC_GET_PHDIV_STATUS:
+ if (radio->ops->phase_div_status) {
+ rval = radio->ops->phase_div_status(radio->core);
+ if (rval >= 0) {
+ *((int *)arg) = rval;
+ rval = 0;
+ }
+ } else {
+ rval = -ENOTTY;
+ }
+ break;
+ case SI476X_IOC_GET_ACF:
+ if (radio->ops->acf_status)
+ rval = radio->ops->acf_status(radio->core,
+ (struct si476x_acf_status_report *)arg);
+ else
+ rval = -ENOTTY;
+ break;
+ case SI476X_IOC_GET_AGC:
+ if (radio->ops->agc_status)
+ rval = radio->ops->agc_status(radio->core,
+ (struct si476x_agc_status_report *)arg);
+ else
+ rval = -ENOTTY;
+ break;
+ case SI476X_IOC_GET_RDS_BLKCNT:
+ if (radio->ops->rds_blckcnt)
+ rval = radio->ops->rds_blckcnt(radio->core, true,
+ (struct si476x_rds_blockcount_report *)arg);
+ else
+ rval = -ENOTTY;
+ break;
+#ifndef CONFIG_VIDEO_ADV_DEBUG
+ case VIDIOC_DBG_G_REGISTER:
+ rval = __g_register(file, fh, arg);
+ break;
+ case VIDIOC_DBG_S_REGISTER:
+ rval = __s_register(file, fh, arg);
+ break;
+#endif
+ default:
+ /* nothing */
+ rval = -ENOTTY;
+ break;
+ }
+
+ si476x_core_unlock(radio->core);
+up_semaphore:
+ up_read(&radio->core_lock);
+ return rval;
+}
+
+static int si476x_radio_fops_open(struct file *file)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ si476x_radio_get(radio);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ if (atomic_inc_return(&radio->core->users) == 1) {
+ si476x_core_lock(radio->core);
+ err = si476x_core_set_power_state(radio->core,
+ SI476X_POWER_UP_FULL);
+ if (err < 0)
+ goto done;
+
+ err = si476x_radio_initialize_mode(radio);
+ if (err < 0)
+ goto power_down;
+
+ si476x_core_unlock(radio->core);
+ } else {
+ err = 0;
+ }
+
+ up_read(&radio->core_lock);
+ return err;
+
+power_down:
+ si476x_core_set_power_state(radio->core,
+ SI476X_POWER_DOWN);
+done:
+ si476x_core_unlock(radio->core);
+ atomic_dec(&radio->core->users);
+up_semaphore:
+ up_read(&radio->core_lock);
+ si476x_radio_put(radio);
+ return err;
+}
+
+static int si476x_radio_fops_release(struct file *file)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ err = -ENODEV;
+ goto up_semaphore;
+ }
+
+ if (atomic_dec_and_test(&radio->core->users)) {
+ err = si476x_core_set_power_state(radio->core,
+ SI476X_POWER_DOWN);
+ } else {
+ err = 0;
+ }
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ si476x_radio_put(radio);
+ return err;
+}
+
+static ssize_t si476x_radio_fops_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t rval;
+ size_t fifo_len;
+ unsigned int copied;
+
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+
+ if (!radio->core) {
+ rval = -ENODEV;
+ goto up_semaphore;
+ }
+
+ /* block if no new data available */
+ if (kfifo_is_empty(&radio->core->rds_fifo)) {
+ if (file->f_flags & O_NONBLOCK) {
+ rval = -EWOULDBLOCK;
+ goto up_semaphore;
+ }
+ rval = wait_event_interruptible(radio->core->rds_read_queue,
+ (!kfifo_is_empty(&radio->core->rds_fifo) ||
+ !atomic_read(&radio->core->is_alive)));
+ if (rval < 0) {
+ rval = -EINTR;
+ goto up_semaphore;
+ }
+ if (!atomic_read(&radio->core->is_alive)) {
+ rval = -ENODEV;
+ goto up_semaphore;
+ }
+ }
+
+ fifo_len = kfifo_len(&radio->core->rds_fifo);
+
+ if (kfifo_to_user(&radio->core->rds_fifo, buf,
+ min(fifo_len, count),
+ &copied) != 0) {
+ dev_warn(&radio->videodev->dev,
+ "Error durnig FIFO to userspace copy\n");
+ rval = -EIO;
+ } else {
+ rval = (ssize_t)copied;
+ }
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return rval;
+}
+
+
+static unsigned int si476x_radio_fops_poll(struct file *file,
+ struct poll_table_struct *pts)
+{
+ int err;
+ struct si476x_radio *radio = video_drvdata(file);
+
+ down_read(&radio->core_lock);
+ if (!radio->core) {
+ err = POLLHUP;
+ goto up_semaphore;
+ }
+
+ if (atomic_read(&radio->core->is_alive))
+ poll_wait(file, &radio->core->rds_read_queue, pts);
+
+ if (!atomic_read(&radio->core->is_alive))
+ err = POLLHUP;
+
+ if (!kfifo_is_empty(&radio->core->rds_fifo))
+ err = POLLIN | POLLRDNORM;
+
+up_semaphore:
+ up_read(&radio->core_lock);
+ return err;
+}
+
+static const struct v4l2_file_operations si476x_fops = {
+ .owner = THIS_MODULE,
+ .read = si476x_radio_fops_read,
+ .poll = si476x_radio_fops_poll,
+ .unlocked_ioctl = video_ioctl2,
+ .open = si476x_radio_fops_open,
+ .release = si476x_radio_fops_release,
+};
+
+static const struct v4l2_ioctl_ops si4761_ioctl_ops = {
+ .vidioc_querycap = si476x_querycap,
+ .vidioc_queryctrl = si476x_queryctrl,
+ .vidioc_querymenu = si476x_querymenu,
+ .vidioc_g_ctrl = si476x_g_ctrl,
+ .vidioc_s_ctrl = si476x_s_ctrl,
+ .vidioc_g_audio = si476x_g_audio,
+ .vidioc_s_audio = si476x_s_audio,
+ .vidioc_enumaudio = si476x_enumaudio,
+ .vidioc_g_tuner = si476x_g_tuner,
+
+ .vidioc_g_frequency = si476x_g_frequency,
+ .vidioc_s_frequency = si476x_s_frequency,
+ .vidioc_s_hw_freq_seek = si476x_s_hw_freq_seek,
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .vidioc_g_register = si476x_g_register,
+ .vidioc_s_register = si476x_s_register,
+#endif
+ .vidioc_default = si476x_default,
+};
+
+
+static const struct video_device si476x_viddev_template = {
+ .fops = &si476x_fops,
+ .name = DRIVER_NAME,
+ .release = video_device_release,
+};
+
+
+static int si476x_radio_initialize_mode(struct si476x_radio *radio)
+{
+ static const struct si476x_radio_ops fm_ops = {
+ .tune_freq = si476x_core_cmd_fm_tune_freq,
+ .seek_start = si476x_core_cmd_fm_seek_start,
+ .rsq_status = si476x_core_cmd_fm_rsq_status,
+ .rds_blckcnt = si476x_core_cmd_fm_rds_blockcount,
+ .phase_diversity = si476x_core_cmd_fm_phase_diversity,
+ .phase_div_status = si476x_core_cmd_fm_phase_div_status,
+ .acf_status = si476x_core_cmd_fm_acf_status,
+ .agc_status = si476x_core_cmd_agc_status,
+ };
+
+ static const struct si476x_radio_ops am_ops = {
+ .tune_freq = si476x_core_cmd_am_tune_freq,
+ .seek_start = si476x_core_cmd_am_seek_start,
+ .rsq_status = si476x_core_cmd_am_rsq_status,
+ .rds_blckcnt = NULL,
+ .phase_diversity = NULL,
+ .phase_div_status = NULL,
+ .acf_status = si476x_core_cmd_am_acf_status,
+ .agc_status = NULL,
+ };
+
+ static const struct si476x_radio_ops none_ops = {
+ .tune_freq = NULL,
+ .seek_start = NULL,
+ .rsq_status = NULL,
+ .rds_blckcnt = NULL,
+ .phase_diversity = NULL,
+ .phase_div_status = NULL,
+ .acf_status = NULL,
+ .agc_status = NULL,
+ };
+
+ struct si476x_func_info info;
+ int retval;
+
+ retval = si476x_core_cmd_func_info(radio->core, &info);
+ if (retval < 0)
+ return retval;
+
+ switch (info.func) {
+ case SI476X_FUNC_FM_RECEIVER:
+ radio->ops = &fm_ops;
+ break;
+ case SI476X_FUNC_AM_RECEIVER:
+ radio->ops = &am_ops;
+ break;
+ default:
+ WARN(1, "Unexpected tuner function value\n"); /* FALLTHROUGH */
+ case SI476X_FUNC_WB_RECEIVER: /* FALLTHROUGH */
+ case SI476X_FUNC_BOOTLOADER:
+ radio->ops = &none_ops;
+ break;
+ }
+
+ return retval;
+}
+
+static int __devinit si476x_radio_probe(struct platform_device *pdev)
+{
+ int rval;
+ struct si476x_core **core = pdev->dev.platform_data;
+ struct si476x_radio *radio;
+
+ if (!core) {
+ dev_err(&pdev->dev, "No platform data.\n");
+ rval = -EINVAL;
+ goto exit;
+ }
+
+ radio = kzalloc(sizeof(*radio), GFP_KERNEL);
+ if (!radio) {
+ rval = -ENOMEM;
+ goto exit;
+ }
+
+ radio->core = *core;
+ si476x_core_get(radio->core);
+
+ radio->videodev = video_device_alloc();
+ if (!radio->videodev) {
+ dev_err(&pdev->dev, "Failed to alloc video device.\n");
+ rval = -ENOMEM;
+ goto free_radio;
+ }
+
+ memcpy(radio->videodev, &si476x_viddev_template,
+ sizeof(struct video_device));
+ radio->videodev->ioctl_ops = &si4761_ioctl_ops;
+
+ /* tie this device to some physical hardware */
+ radio->videodev->parent = &pdev->dev;
+
+ video_set_drvdata(radio->videodev, radio);
+ platform_set_drvdata(pdev, radio);
+
+ /* register video device */
+ rval = video_register_device(radio->videodev, VFL_TYPE_RADIO, -1);
+
+ if (rval) {
+ dev_err(&pdev->dev, "Could not register video device\n");
+ } else {
+ init_rwsem(&radio->core_lock);
+ kref_init(&radio->kref);
+ /* si476x_debugfs_init(radio, id->name); */
+ return 0;
+ }
+
+free_radio:
+ kfree(radio);
+exit:
+ return rval;
+}
+
+static void si476x_radio_delete(struct kref *kref)
+{
+ struct si476x_radio *radio = kref_to_si476x_radio(kref);
+ kfree(radio);
+}
+
+
+static int si476x_radio_remove(struct platform_device *pdev)
+{
+ struct si476x_radio *radio = platform_get_drvdata(pdev);
+
+
+ video_unregister_device(radio->videodev);
+
+ down_write(&radio->core_lock);
+ si476x_core_put(radio->core);
+ radio->core = NULL;
+ up_write(&radio->core_lock);
+
+ si476x_radio_put(radio);
+
+ return 0;
+}
+
+MODULE_ALIAS("platform:si476x-radio");
+
+static struct platform_driver si476x_radio_driver = {
+ .probe = si476x_radio_probe,
+ .remove = __devexit_p(si476x_radio_remove),
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init si476x_module_init(void)
+{
+ return platform_driver_register(&si476x_radio_driver);
+}
+module_init(si476x_module_init);
+
+static void __exit si476x_module_exit(void)
+{
+ platform_driver_unregister(&si476x_radio_driver);
+}
+module_exit(si476x_module_exit);
+
+MODULE_AUTHOR("Andrey Smirnov <andrey.smirnov@convergeddevices.net>");
+MODULE_DESCRIPTION("Driver for Si4761/64/68 AM/FM Radio MFD Cell");
+MODULE_LICENSE("GPL");
--
1.7.9.5


\
 
 \ /
  Last update: 2012-09-14 01:41    [W:0.150 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site