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path: root/drivers/media/dvb-frontends/zl10039.c
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Diffstat (limited to 'drivers/media/dvb-frontends/zl10039.c')
-rw-r--r--drivers/media/dvb-frontends/zl10039.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/zl10039.c b/drivers/media/dvb-frontends/zl10039.c
new file mode 100644
index 0000000000..a3e4d21940
--- /dev/null
+++ b/drivers/media/dvb-frontends/zl10039.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Zarlink ZL10039 DVB-S tuner
+ *
+ * Copyright 2007 Jan D. Louw <jd.louw@mweb.co.za>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/dvb/frontend.h>
+
+#include <media/dvb_frontend.h>
+#include "zl10039.h"
+
+static int debug;
+
+/* Max transfer size done by I2C transfer functions */
+#define MAX_XFER_SIZE 64
+
+#define dprintk(args...) \
+ do { \
+ if (debug) \
+ printk(KERN_DEBUG args); \
+ } while (0)
+
+enum zl10039_model_id {
+ ID_ZL10039 = 1
+};
+
+struct zl10039_state {
+ struct i2c_adapter *i2c;
+ u8 i2c_addr;
+ u8 id;
+};
+
+enum zl10039_reg_addr {
+ PLL0 = 0,
+ PLL1,
+ PLL2,
+ PLL3,
+ RFFE,
+ BASE0,
+ BASE1,
+ BASE2,
+ LO0,
+ LO1,
+ LO2,
+ LO3,
+ LO4,
+ LO5,
+ LO6,
+ GENERAL
+};
+
+static int zl10039_read(const struct zl10039_state *state,
+ const enum zl10039_reg_addr reg, u8 *buf,
+ const size_t count)
+{
+ u8 regbuf[] = { reg };
+ struct i2c_msg msg[] = {
+ {/* Write register address */
+ .addr = state->i2c_addr,
+ .flags = 0,
+ .buf = regbuf,
+ .len = 1,
+ }, {/* Read count bytes */
+ .addr = state->i2c_addr,
+ .flags = I2C_M_RD,
+ .buf = buf,
+ .len = count,
+ },
+ };
+
+ dprintk("%s\n", __func__);
+
+ if (i2c_transfer(state->i2c, msg, 2) != 2) {
+ dprintk("%s: i2c read error\n", __func__);
+ return -EREMOTEIO;
+ }
+
+ return 0; /* Success */
+}
+
+static int zl10039_write(struct zl10039_state *state,
+ const enum zl10039_reg_addr reg, const u8 *src,
+ const size_t count)
+{
+ u8 buf[MAX_XFER_SIZE];
+ struct i2c_msg msg = {
+ .addr = state->i2c_addr,
+ .flags = 0,
+ .buf = buf,
+ .len = count + 1,
+ };
+
+ if (1 + count > sizeof(buf)) {
+ printk(KERN_WARNING
+ "%s: i2c wr reg=%04x: len=%zu is too big!\n",
+ KBUILD_MODNAME, reg, count);
+ return -EINVAL;
+ }
+
+ dprintk("%s\n", __func__);
+ /* Write register address and data in one go */
+ buf[0] = reg;
+ memcpy(&buf[1], src, count);
+ if (i2c_transfer(state->i2c, &msg, 1) != 1) {
+ dprintk("%s: i2c write error\n", __func__);
+ return -EREMOTEIO;
+ }
+
+ return 0; /* Success */
+}
+
+static inline int zl10039_readreg(struct zl10039_state *state,
+ const enum zl10039_reg_addr reg, u8 *val)
+{
+ return zl10039_read(state, reg, val, 1);
+}
+
+static inline int zl10039_writereg(struct zl10039_state *state,
+ const enum zl10039_reg_addr reg,
+ const u8 val)
+{
+ const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
+
+ return zl10039_write(state, reg, &tmp, 1);
+}
+
+static int zl10039_init(struct dvb_frontend *fe)
+{
+ struct zl10039_state *state = fe->tuner_priv;
+ int ret;
+
+ dprintk("%s\n", __func__);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ /* Reset logic */
+ ret = zl10039_writereg(state, GENERAL, 0x40);
+ if (ret < 0) {
+ dprintk("Note: i2c write error normal when resetting the tuner\n");
+ }
+ /* Wake up */
+ ret = zl10039_writereg(state, GENERAL, 0x01);
+ if (ret < 0) {
+ dprintk("Tuner power up failed\n");
+ return ret;
+ }
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ return 0;
+}
+
+static int zl10039_sleep(struct dvb_frontend *fe)
+{
+ struct zl10039_state *state = fe->tuner_priv;
+ int ret;
+
+ dprintk("%s\n", __func__);
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ ret = zl10039_writereg(state, GENERAL, 0x80);
+ if (ret < 0) {
+ dprintk("Tuner sleep failed\n");
+ return ret;
+ }
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ return 0;
+}
+
+static int zl10039_set_params(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct zl10039_state *state = fe->tuner_priv;
+ u8 buf[6];
+ u8 bf;
+ u32 fbw;
+ u32 div;
+ int ret;
+
+ dprintk("%s\n", __func__);
+ dprintk("Set frequency = %d, symbol rate = %d\n",
+ c->frequency, c->symbol_rate);
+
+ /* Assumed 10.111 MHz crystal oscillator */
+ /* Cancelled num/den 80 to prevent overflow */
+ div = (c->frequency * 1000) / 126387;
+ fbw = (c->symbol_rate * 27) / 32000;
+ /* Cancelled num/den 10 to prevent overflow */
+ bf = ((fbw * 5088) / 1011100) - 1;
+
+ /*PLL divider*/
+ buf[0] = (div >> 8) & 0x7f;
+ buf[1] = (div >> 0) & 0xff;
+ /*Reference divider*/
+ /* Select reference ratio of 80 */
+ buf[2] = 0x1D;
+ /*PLL test modes*/
+ buf[3] = 0x40;
+ /*RF Control register*/
+ buf[4] = 0x6E; /* Bypass enable */
+ /*Baseband filter cutoff */
+ buf[5] = bf;
+
+ /* Open i2c gate */
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ /* BR = 10, Enable filter adjustment */
+ ret = zl10039_writereg(state, BASE1, 0x0A);
+ if (ret < 0)
+ goto error;
+ /* Write new config values */
+ ret = zl10039_write(state, PLL0, buf, sizeof(buf));
+ if (ret < 0)
+ goto error;
+ /* BR = 10, Disable filter adjustment */
+ ret = zl10039_writereg(state, BASE1, 0x6A);
+ if (ret < 0)
+ goto error;
+
+ /* Close i2c gate */
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ return 0;
+error:
+ dprintk("Error setting tuner\n");
+ return ret;
+}
+
+static void zl10039_release(struct dvb_frontend *fe)
+{
+ struct zl10039_state *state = fe->tuner_priv;
+
+ dprintk("%s\n", __func__);
+ kfree(state);
+ fe->tuner_priv = NULL;
+}
+
+static const struct dvb_tuner_ops zl10039_ops = {
+ .release = zl10039_release,
+ .init = zl10039_init,
+ .sleep = zl10039_sleep,
+ .set_params = zl10039_set_params,
+};
+
+struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe,
+ u8 i2c_addr, struct i2c_adapter *i2c)
+{
+ struct zl10039_state *state = NULL;
+
+ dprintk("%s\n", __func__);
+ state = kmalloc(sizeof(struct zl10039_state), GFP_KERNEL);
+ if (state == NULL)
+ goto error;
+
+ state->i2c = i2c;
+ state->i2c_addr = i2c_addr;
+
+ /* Open i2c gate */
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+ /* check if this is a valid tuner */
+ if (zl10039_readreg(state, GENERAL, &state->id) < 0) {
+ /* Close i2c gate */
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ goto error;
+ }
+ /* Close i2c gate */
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ state->id = state->id & 0x0f;
+ switch (state->id) {
+ case ID_ZL10039:
+ strscpy(fe->ops.tuner_ops.info.name,
+ "Zarlink ZL10039 DVB-S tuner",
+ sizeof(fe->ops.tuner_ops.info.name));
+ break;
+ default:
+ dprintk("Chip ID=%x does not match a known type\n", state->id);
+ goto error;
+ }
+
+ memcpy(&fe->ops.tuner_ops, &zl10039_ops, sizeof(struct dvb_tuner_ops));
+ fe->tuner_priv = state;
+ dprintk("Tuner attached @ i2c address 0x%02x\n", i2c_addr);
+ return fe;
+error:
+ kfree(state);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(zl10039_attach);
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
+MODULE_DESCRIPTION("Zarlink ZL10039 DVB-S tuner driver");
+MODULE_AUTHOR("Jan D. Louw <jd.louw@mweb.co.za>");
+MODULE_LICENSE("GPL");
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