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path: root/drivers/media/pci/ddbridge/ddbridge-dummy-fe.c
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Diffstat (limited to 'drivers/media/pci/ddbridge/ddbridge-dummy-fe.c')
-rw-r--r--drivers/media/pci/ddbridge/ddbridge-dummy-fe.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/drivers/media/pci/ddbridge/ddbridge-dummy-fe.c b/drivers/media/pci/ddbridge/ddbridge-dummy-fe.c
new file mode 100644
index 000000000..520ebd16b
--- /dev/null
+++ b/drivers/media/pci/ddbridge/ddbridge-dummy-fe.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Dummy Frontend
+ *
+ * Written by Emard <emard@softhome.net>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <media/dvb_frontend.h>
+#include "ddbridge-dummy-fe.h"
+
+struct ddbridge_dummy_fe_state {
+ struct dvb_frontend frontend;
+};
+
+static int ddbridge_dummy_fe_read_status(struct dvb_frontend *fe,
+ enum fe_status *status)
+{
+ *status = FE_HAS_SIGNAL
+ | FE_HAS_CARRIER
+ | FE_HAS_VITERBI
+ | FE_HAS_SYNC
+ | FE_HAS_LOCK;
+
+ return 0;
+}
+
+static int ddbridge_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+ *ber = 0;
+ return 0;
+}
+
+static int ddbridge_dummy_fe_read_signal_strength(struct dvb_frontend *fe,
+ u16 *strength)
+{
+ *strength = 0;
+ return 0;
+}
+
+static int ddbridge_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+ *snr = 0;
+ return 0;
+}
+
+static int ddbridge_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+ *ucblocks = 0;
+ return 0;
+}
+
+/*
+ * Should only be implemented if it actually reads something from the hardware.
+ * Also, it should check for the locks, in order to avoid report wrong data
+ * to userspace.
+ */
+static int ddbridge_dummy_fe_get_frontend(struct dvb_frontend *fe,
+ struct dtv_frontend_properties *p)
+{
+ return 0;
+}
+
+static int ddbridge_dummy_fe_set_frontend(struct dvb_frontend *fe)
+{
+ if (fe->ops.tuner_ops.set_params) {
+ fe->ops.tuner_ops.set_params(fe);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ }
+
+ return 0;
+}
+
+static int ddbridge_dummy_fe_sleep(struct dvb_frontend *fe)
+{
+ return 0;
+}
+
+static int ddbridge_dummy_fe_init(struct dvb_frontend *fe)
+{
+ return 0;
+}
+
+static void ddbridge_dummy_fe_release(struct dvb_frontend *fe)
+{
+ struct ddbridge_dummy_fe_state *state = fe->demodulator_priv;
+
+ kfree(state);
+}
+
+static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops;
+
+struct dvb_frontend *ddbridge_dummy_fe_qam_attach(void)
+{
+ struct ddbridge_dummy_fe_state *state = NULL;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(struct ddbridge_dummy_fe_state), GFP_KERNEL);
+ if (!state)
+ return NULL;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops,
+ &ddbridge_dummy_fe_qam_ops,
+ sizeof(struct dvb_frontend_ops));
+
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+}
+EXPORT_SYMBOL_GPL(ddbridge_dummy_fe_qam_attach);
+
+static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops = {
+ .delsys = { SYS_DVBC_ANNEX_A },
+ .info = {
+ .name = "ddbridge dummy DVB-C",
+ .frequency_min_hz = 51 * MHz,
+ .frequency_max_hz = 858 * MHz,
+ .frequency_stepsize_hz = 62500,
+ /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */
+ .symbol_rate_min = (57840000 / 2) / 64,
+ .symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */
+ .caps = FE_CAN_QAM_16 |
+ FE_CAN_QAM_32 |
+ FE_CAN_QAM_64 |
+ FE_CAN_QAM_128 |
+ FE_CAN_QAM_256 |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_INVERSION_AUTO
+ },
+
+ .release = ddbridge_dummy_fe_release,
+
+ .init = ddbridge_dummy_fe_init,
+ .sleep = ddbridge_dummy_fe_sleep,
+
+ .set_frontend = ddbridge_dummy_fe_set_frontend,
+ .get_frontend = ddbridge_dummy_fe_get_frontend,
+
+ .read_status = ddbridge_dummy_fe_read_status,
+ .read_ber = ddbridge_dummy_fe_read_ber,
+ .read_signal_strength = ddbridge_dummy_fe_read_signal_strength,
+ .read_snr = ddbridge_dummy_fe_read_snr,
+ .read_ucblocks = ddbridge_dummy_fe_read_ucblocks,
+};
+
+MODULE_DESCRIPTION("ddbridge dummy Frontend");
+MODULE_AUTHOR("Emard");
+MODULE_LICENSE("GPL");