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Diffstat (limited to 'drivers/media/dvb/frontends/lgs8gl5.c')
-rw-r--r--drivers/media/dvb/frontends/lgs8gl5.c480
1 files changed, 480 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/lgs8gl5.c b/drivers/media/dvb/frontends/lgs8gl5.c
new file mode 100644
index 00000000000..c0a223d28b0
--- /dev/null
+++ b/drivers/media/dvb/frontends/lgs8gl5.c
@@ -0,0 +1,480 @@
+/*
+ Legend Silicon LGS-8GL5 DMB-TH OFDM demodulator driver
+
+ Copyright (C) 2008 Sirius International (Hong Kong) Limited
+ Timothy Lee <timothy.lee@siriushk.com>
+
+ 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include "dvb_frontend.h"
+#include "lgs8gl5.h"
+
+
+#define REG_RESET 0x02
+#define REG_RESET_OFF 0x01
+#define REG_03 0x03
+#define REG_04 0x04
+#define REG_07 0x07
+#define REG_09 0x09
+#define REG_0A 0x0a
+#define REG_0B 0x0b
+#define REG_0C 0x0c
+#define REG_37 0x37
+#define REG_STRENGTH 0x4b
+#define REG_STRENGTH_MASK 0x7f
+#define REG_STRENGTH_CARRIER 0x80
+#define REG_INVERSION 0x7c
+#define REG_INVERSION_ON 0x80
+#define REG_7D 0x7d
+#define REG_7E 0x7e
+#define REG_A2 0xa2
+#define REG_STATUS 0xa4
+#define REG_STATUS_SYNC 0x04
+#define REG_STATUS_LOCK 0x01
+
+
+struct lgs8gl5_state {
+ struct i2c_adapter *i2c;
+ const struct lgs8gl5_config *config;
+ struct dvb_frontend frontend;
+};
+
+
+static int debug;
+#define dprintk(args...) \
+ do { \
+ if (debug) \
+ printk(KERN_DEBUG "lgs8gl5: " args); \
+ } while (0)
+
+
+/* Writes into demod's register */
+static int
+lgs8gl5_write_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
+{
+ int ret;
+ u8 buf[] = {reg, data};
+ struct i2c_msg msg = {
+ .addr = state->config->demod_address,
+ .flags = 0,
+ .buf = buf,
+ .len = 2
+ };
+
+ ret = i2c_transfer(state->i2c, &msg, 1);
+ if (ret != 1)
+ dprintk("%s: error (reg=0x%02x, val=0x%02x, ret=%i)\n",
+ __func__, reg, data, ret);
+ return (ret != 1) ? -1 : 0;
+}
+
+
+/* Reads from demod's register */
+static int
+lgs8gl5_read_reg(struct lgs8gl5_state *state, u8 reg)
+{
+ int ret, j;
+ u8 b0[] = {reg};
+ u8 b1[] = {0};
+ struct i2c_msg msg[2] = {
+ {
+ .addr = state->config->demod_address,
+ .flags = 0,
+ .buf = b0,
+ .len = 1
+ },
+ {
+ .addr = state->config->demod_address,
+ .flags = I2C_M_RD,
+ .buf = b1,
+ .len = 1
+ }
+ };
+
+ ret = i2c_transfer(state->i2c, msg, 2);
+ if (ret != 2)
+ return -EIO;
+
+ return b1[0];
+}
+
+
+static int
+lgs8gl5_update_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
+{
+ lgs8gl5_read_reg(state, reg);
+ lgs8gl5_write_reg(state, reg, data);
+ return 0;
+}
+
+
+/* Writes into alternate device's register */
+/* TODO: Find out what that device is for! */
+static int
+lgs8gl5_update_alt_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
+{
+ int ret, j;
+ u8 b0[] = {reg};
+ u8 b1[] = {0};
+ u8 b2[] = {reg, data};
+ struct i2c_msg msg[3] = {
+ {
+ .addr = state->config->demod_address + 2,
+ .flags = 0,
+ .buf = b0,
+ .len = 1
+ },
+ {
+ .addr = state->config->demod_address + 2,
+ .flags = I2C_M_RD,
+ .buf = b1,
+ .len = 1
+ },
+ {
+ .addr = state->config->demod_address + 2,
+ .flags = 0,
+ .buf = b2,
+ .len = 2
+ },
+ };
+
+ ret = i2c_transfer(state->i2c, msg, 3);
+ return (ret != 3) ? -1 : 0;
+}
+
+
+static void
+lgs8gl5_soft_reset(struct lgs8gl5_state *state)
+{
+ u8 val;
+
+ dprintk("%s\n", __func__);
+
+ val = lgs8gl5_read_reg(state, REG_RESET);
+ lgs8gl5_write_reg(state, REG_RESET, val & ~REG_RESET_OFF);
+ lgs8gl5_write_reg(state, REG_RESET, val | REG_RESET_OFF);
+ msleep(5);
+}
+
+
+static int
+lgs8gl5_set_inversion(struct lgs8gl5_state *state, int inversion)
+{
+ u8 val;
+
+ dprintk("%s\n", __func__);
+
+ switch (inversion) {
+ case INVERSION_AUTO:
+ return -EOPNOTSUPP;
+ case INVERSION_ON:
+ val = lgs8gl5_read_reg(state, REG_INVERSION);
+ return lgs8gl5_write_reg(state, REG_INVERSION,
+ val | REG_INVERSION_ON);
+ case INVERSION_OFF:
+ val = lgs8gl5_read_reg(state, REG_INVERSION);
+ return lgs8gl5_write_reg(state, REG_INVERSION,
+ val & ~REG_INVERSION_ON);
+ default:
+ return -EINVAL;
+ }
+}
+
+
+/* Starts demodulation */
+static void
+lgs8gl5_start_demod(struct lgs8gl5_state *state)
+{
+ u8 val;
+ int n;
+
+ dprintk("%s\n", __func__);
+
+ lgs8gl5_update_alt_reg(state, 0xc2, 0x28);
+ lgs8gl5_soft_reset(state);
+ lgs8gl5_update_reg(state, REG_07, 0x10);
+ lgs8gl5_update_reg(state, REG_07, 0x10);
+ lgs8gl5_write_reg(state, REG_09, 0x0e);
+ lgs8gl5_write_reg(state, REG_0A, 0xe5);
+ lgs8gl5_write_reg(state, REG_0B, 0x35);
+ lgs8gl5_write_reg(state, REG_0C, 0x30);
+
+ lgs8gl5_update_reg(state, REG_03, 0x00);
+ lgs8gl5_update_reg(state, REG_7E, 0x01);
+ lgs8gl5_update_alt_reg(state, 0xc5, 0x00);
+ lgs8gl5_update_reg(state, REG_04, 0x02);
+ lgs8gl5_update_reg(state, REG_37, 0x01);
+ lgs8gl5_soft_reset(state);
+
+ /* Wait for carrier */
+ for (n = 0; n < 10; n++) {
+ val = lgs8gl5_read_reg(state, REG_STRENGTH);
+ dprintk("Wait for carrier[%d] 0x%02X\n", n, val);
+ if (val & REG_STRENGTH_CARRIER)
+ break;
+ msleep(4);
+ }
+ if (!(val & REG_STRENGTH_CARRIER))
+ return;
+
+ /* Wait for lock */
+ for (n = 0; n < 20; n++) {
+ val = lgs8gl5_read_reg(state, REG_STATUS);
+ dprintk("Wait for lock[%d] 0x%02X\n", n, val);
+ if (val & REG_STATUS_LOCK)
+ break;
+ msleep(12);
+ }
+ if (!(val & REG_STATUS_LOCK))
+ return;
+
+ lgs8gl5_write_reg(state, REG_7D, lgs8gl5_read_reg(state, REG_A2));
+ lgs8gl5_soft_reset(state);
+}
+
+
+static int
+lgs8gl5_init(struct dvb_frontend *fe)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+
+ dprintk("%s\n", __func__);
+
+ lgs8gl5_update_alt_reg(state, 0xc2, 0x28);
+ lgs8gl5_soft_reset(state);
+ lgs8gl5_update_reg(state, REG_07, 0x10);
+ lgs8gl5_update_reg(state, REG_07, 0x10);
+ lgs8gl5_write_reg(state, REG_09, 0x0e);
+ lgs8gl5_write_reg(state, REG_0A, 0xe5);
+ lgs8gl5_write_reg(state, REG_0B, 0x35);
+ lgs8gl5_write_reg(state, REG_0C, 0x30);
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
+ u8 flags = lgs8gl5_read_reg(state, REG_STATUS);
+
+ *status = 0;
+
+ if ((level & REG_STRENGTH_MASK) > 0)
+ *status |= FE_HAS_SIGNAL;
+ if (level & REG_STRENGTH_CARRIER)
+ *status |= FE_HAS_CARRIER;
+ if (flags & REG_STATUS_SYNC)
+ *status |= FE_HAS_SYNC;
+ if (flags & REG_STATUS_LOCK)
+ *status |= FE_HAS_LOCK;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ *ber = 0;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_read_signal_strength(struct dvb_frontend *fe, u16 *signal_strength)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
+ *signal_strength = (level & REG_STRENGTH_MASK) << 8;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
+ *snr = (level & REG_STRENGTH_MASK) << 8;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ *ucblocks = 0;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_set_frontend(struct dvb_frontend *fe,
+ struct dvb_frontend_parameters *p)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+
+ dprintk("%s\n", __func__);
+
+ if (p->u.ofdm.bandwidth != BANDWIDTH_8_MHZ)
+ return -EINVAL;
+
+ if (fe->ops.tuner_ops.set_params) {
+ fe->ops.tuner_ops.set_params(fe, p);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ }
+
+ /* lgs8gl5_set_inversion(state, p->inversion); */
+
+ lgs8gl5_start_demod(state);
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_get_frontend(struct dvb_frontend *fe,
+ struct dvb_frontend_parameters *p)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ u8 inv = lgs8gl5_read_reg(state, REG_INVERSION);
+ struct dvb_ofdm_parameters *o = &p->u.ofdm;
+
+ p->inversion = (inv & REG_INVERSION_ON) ? INVERSION_ON : INVERSION_OFF;
+
+ o->code_rate_HP = FEC_1_2;
+ o->code_rate_LP = FEC_7_8;
+ o->guard_interval = GUARD_INTERVAL_1_32;
+ o->transmission_mode = TRANSMISSION_MODE_2K;
+ o->constellation = QAM_64;
+ o->hierarchy_information = HIERARCHY_NONE;
+ o->bandwidth = BANDWIDTH_8_MHZ;
+
+ return 0;
+}
+
+
+static int
+lgs8gl5_get_tune_settings(struct dvb_frontend *fe,
+ struct dvb_frontend_tune_settings *fesettings)
+{
+ fesettings->min_delay_ms = 240;
+ fesettings->step_size = 0;
+ fesettings->max_drift = 0;
+ return 0;
+}
+
+
+static void
+lgs8gl5_release(struct dvb_frontend *fe)
+{
+ struct lgs8gl5_state *state = fe->demodulator_priv;
+ kfree(state);
+}
+
+
+static struct dvb_frontend_ops lgs8gl5_ops;
+
+
+struct dvb_frontend*
+lgs8gl5_attach(const struct lgs8gl5_config *config, struct i2c_adapter *i2c)
+{
+ struct lgs8gl5_state *state = NULL;
+
+ dprintk("%s\n", __func__);
+
+ /* Allocate memory for the internal state */
+ state = kmalloc(sizeof(struct lgs8gl5_state), GFP_KERNEL);
+ if (state == NULL)
+ goto error;
+
+ /* Setup the state */
+ state->config = config;
+ state->i2c = i2c;
+
+ /* Check if the demod is there */
+ if (lgs8gl5_read_reg(state, REG_RESET) < 0)
+ goto error;
+
+ /* Create dvb_frontend */
+ memcpy(&state->frontend.ops, &lgs8gl5_ops,
+ sizeof(struct dvb_frontend_ops));
+ state->frontend.demodulator_priv = state;
+ return &state->frontend;
+
+error:
+ kfree(state);
+ return NULL;
+}
+EXPORT_SYMBOL(lgs8gl5_attach);
+
+
+static struct dvb_frontend_ops lgs8gl5_ops = {
+ .info = {
+ .name = "Legend Silicon LGS-8GL5 DMB-TH",
+ .type = FE_OFDM,
+ .frequency_min = 474000000,
+ .frequency_max = 858000000,
+ .frequency_stepsize = 10000,
+ .frequency_tolerance = 0,
+ .caps = FE_CAN_FEC_AUTO |
+ FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_32 |
+ FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO |
+ FE_CAN_BANDWIDTH_AUTO |
+ FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_HIERARCHY_AUTO |
+ FE_CAN_RECOVER
+ },
+
+ .release = lgs8gl5_release,
+
+ .init = lgs8gl5_init,
+
+ .set_frontend = lgs8gl5_set_frontend,
+ .get_frontend = lgs8gl5_get_frontend,
+ .get_tune_settings = lgs8gl5_get_tune_settings,
+
+ .read_status = lgs8gl5_read_status,
+ .read_ber = lgs8gl5_read_ber,
+ .read_signal_strength = lgs8gl5_read_signal_strength,
+ .read_snr = lgs8gl5_read_snr,
+ .read_ucblocks = lgs8gl5_read_ucblocks,
+};
+
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+
+MODULE_DESCRIPTION("Legend Silicon LGS-8GL5 DMB-TH Demodulator driver");
+MODULE_AUTHOR("Timothy Lee");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-09 01:34:42 +0000