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path: root/drivers/media/dvb-frontends/dibx000_common.c
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Diffstat (limited to 'drivers/media/dvb-frontends/dibx000_common.c')
-rw-r--r--drivers/media/dvb-frontends/dibx000_common.c508
1 files changed, 508 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/dibx000_common.c b/drivers/media/dvb-frontends/dibx000_common.c
new file mode 100644
index 000000000..63a4c6a4a
--- /dev/null
+++ b/drivers/media/dvb-frontends/dibx000_common.c
@@ -0,0 +1,508 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+
+#include "dibx000_common.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");
+
+#define dprintk(fmt, arg...) do { \
+ if (debug) \
+ printk(KERN_DEBUG pr_fmt("%s: " fmt), \
+ __func__, ##arg); \
+} while (0)
+
+static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
+{
+ int ret;
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock\n");
+ return -EINVAL;
+ }
+
+ mst->i2c_write_buffer[0] = (reg >> 8) & 0xff;
+ mst->i2c_write_buffer[1] = reg & 0xff;
+ mst->i2c_write_buffer[2] = (val >> 8) & 0xff;
+ mst->i2c_write_buffer[3] = val & 0xff;
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg));
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 4;
+
+ ret = i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0;
+ mutex_unlock(&mst->i2c_buffer_lock);
+
+ return ret;
+}
+
+static u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg)
+{
+ u16 ret;
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock\n");
+ return 0;
+ }
+
+ mst->i2c_write_buffer[0] = reg >> 8;
+ mst->i2c_write_buffer[1] = reg & 0xff;
+
+ memset(mst->msg, 0, 2 * sizeof(struct i2c_msg));
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 2;
+ mst->msg[1].addr = mst->i2c_addr;
+ mst->msg[1].flags = I2C_M_RD;
+ mst->msg[1].buf = mst->i2c_read_buffer;
+ mst->msg[1].len = 2;
+
+ if (i2c_transfer(mst->i2c_adap, mst->msg, 2) != 2)
+ dprintk("i2c read error on %d\n", reg);
+
+ ret = (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1];
+ mutex_unlock(&mst->i2c_buffer_lock);
+
+ return ret;
+}
+
+static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst)
+{
+ int i = 100;
+ u16 status;
+
+ while (((status = dibx000_read_word(mst, mst->base_reg + 2)) & 0x0100) == 0 && --i > 0)
+ ;
+
+ /* i2c timed out */
+ if (i == 0)
+ return -EREMOTEIO;
+
+ /* no acknowledge */
+ if ((status & 0x0080) == 0)
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+static int dibx000_master_i2c_write(struct dibx000_i2c_master *mst, struct i2c_msg *msg, u8 stop)
+{
+ u16 data;
+ u16 da;
+ u16 i;
+ u16 txlen = msg->len, len;
+ const u8 *b = msg->buf;
+
+ while (txlen) {
+ dibx000_read_word(mst, mst->base_reg + 2);
+
+ len = txlen > 8 ? 8 : txlen;
+ for (i = 0; i < len; i += 2) {
+ data = *b++ << 8;
+ if (i+1 < len)
+ data |= *b++;
+ dibx000_write_word(mst, mst->base_reg, data);
+ }
+ da = (((u8) (msg->addr)) << 9) |
+ (1 << 8) |
+ (1 << 7) |
+ (0 << 6) |
+ (0 << 5) |
+ ((len & 0x7) << 2) |
+ (0 << 1) |
+ (0 << 0);
+
+ if (txlen == msg->len)
+ da |= 1 << 5; /* start */
+
+ if (txlen-len == 0 && stop)
+ da |= 1 << 6; /* stop */
+
+ dibx000_write_word(mst, mst->base_reg+1, da);
+
+ if (dibx000_is_i2c_done(mst) != 0)
+ return -EREMOTEIO;
+ txlen -= len;
+ }
+
+ return 0;
+}
+
+static int dibx000_master_i2c_read(struct dibx000_i2c_master *mst, struct i2c_msg *msg)
+{
+ u16 da;
+ u8 *b = msg->buf;
+ u16 rxlen = msg->len, len;
+
+ while (rxlen) {
+ len = rxlen > 8 ? 8 : rxlen;
+ da = (((u8) (msg->addr)) << 9) |
+ (1 << 8) |
+ (1 << 7) |
+ (0 << 6) |
+ (0 << 5) |
+ ((len & 0x7) << 2) |
+ (1 << 1) |
+ (0 << 0);
+
+ if (rxlen == msg->len)
+ da |= 1 << 5; /* start */
+
+ if (rxlen-len == 0)
+ da |= 1 << 6; /* stop */
+ dibx000_write_word(mst, mst->base_reg+1, da);
+
+ if (dibx000_is_i2c_done(mst) != 0)
+ return -EREMOTEIO;
+
+ rxlen -= len;
+
+ while (len) {
+ da = dibx000_read_word(mst, mst->base_reg);
+ *b++ = (da >> 8) & 0xff;
+ len--;
+ if (len >= 1) {
+ *b++ = da & 0xff;
+ len--;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int dibx000_i2c_set_speed(struct i2c_adapter *i2c_adap, u16 speed)
+{
+ struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+
+ if (mst->device_rev < DIB7000MC && speed < 235)
+ speed = 235;
+ return dibx000_write_word(mst, mst->base_reg + 3, (u16)(60000 / speed));
+
+}
+EXPORT_SYMBOL(dibx000_i2c_set_speed);
+
+static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C;
+}
+
+static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst,
+ enum dibx000_i2c_interface intf)
+{
+ if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) {
+ dprintk("selecting interface: %d\n", intf);
+ mst->selected_interface = intf;
+ return dibx000_write_word(mst, mst->base_reg + 4, intf);
+ }
+ return 0;
+}
+
+static int dibx000_i2c_master_xfer_gpio12(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
+{
+ struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int msg_index;
+ int ret = 0;
+
+ dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_1_2);
+ for (msg_index = 0; msg_index < num; msg_index++) {
+ if (msg[msg_index].flags & I2C_M_RD) {
+ ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
+ if (ret != 0)
+ return 0;
+ } else {
+ ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
+ if (ret != 0)
+ return 0;
+ }
+ }
+
+ return num;
+}
+
+static int dibx000_i2c_master_xfer_gpio34(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
+{
+ struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int msg_index;
+ int ret = 0;
+
+ dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_3_4);
+ for (msg_index = 0; msg_index < num; msg_index++) {
+ if (msg[msg_index].flags & I2C_M_RD) {
+ ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
+ if (ret != 0)
+ return 0;
+ } else {
+ ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
+ if (ret != 0)
+ return 0;
+ }
+ }
+
+ return num;
+}
+
+static struct i2c_algorithm dibx000_i2c_master_gpio12_xfer_algo = {
+ .master_xfer = dibx000_i2c_master_xfer_gpio12,
+ .functionality = dibx000_i2c_func,
+};
+
+static struct i2c_algorithm dibx000_i2c_master_gpio34_xfer_algo = {
+ .master_xfer = dibx000_i2c_master_xfer_gpio34,
+ .functionality = dibx000_i2c_func,
+};
+
+static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4],
+ u8 addr, int onoff)
+{
+ u16 val;
+
+
+ if (onoff)
+ val = addr << 8; // bit 7 = use master or not, if 0, the gate is open
+ else
+ val = 1 << 7;
+
+ if (mst->device_rev > DIB7000)
+ val <<= 1;
+
+ tx[0] = (((mst->base_reg + 1) >> 8) & 0xff);
+ tx[1] = ((mst->base_reg + 1) & 0xff);
+ tx[2] = val >> 8;
+ tx[3] = val & 0xff;
+
+ return 0;
+}
+
+static int dibx000_i2c_gated_gpio67_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msg[], int num)
+{
+ struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int ret;
+
+ if (num > 32) {
+ dprintk("%s: too much I2C message to be transmitted (%i). Maximum is 32",
+ __func__, num);
+ return -ENOMEM;
+ }
+
+ dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_6_7);
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock\n");
+ return -EINVAL;
+ }
+
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
+
+ /* open the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].buf = &mst->i2c_write_buffer[0];
+ mst->msg[0].len = 4;
+
+ memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
+
+ /* close the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
+ mst->msg[num + 1].addr = mst->i2c_addr;
+ mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
+ mst->msg[num + 1].len = 4;
+
+ ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
+ num : -EIO);
+
+ mutex_unlock(&mst->i2c_buffer_lock);
+ return ret;
+}
+
+static struct i2c_algorithm dibx000_i2c_gated_gpio67_algo = {
+ .master_xfer = dibx000_i2c_gated_gpio67_xfer,
+ .functionality = dibx000_i2c_func,
+};
+
+static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msg[], int num)
+{
+ struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
+ int ret;
+
+ if (num > 32) {
+ dprintk("%s: too much I2C message to be transmitted (%i). Maximum is 32",
+ __func__, num);
+ return -ENOMEM;
+ }
+
+ dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
+
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock\n");
+ return -EINVAL;
+ }
+ memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num));
+
+ /* open the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1);
+ mst->msg[0].addr = mst->i2c_addr;
+ mst->msg[0].buf = &mst->i2c_write_buffer[0];
+ mst->msg[0].len = 4;
+
+ memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num);
+
+ /* close the gate */
+ dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0);
+ mst->msg[num + 1].addr = mst->i2c_addr;
+ mst->msg[num + 1].buf = &mst->i2c_write_buffer[4];
+ mst->msg[num + 1].len = 4;
+
+ ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ?
+ num : -EIO);
+ mutex_unlock(&mst->i2c_buffer_lock);
+ return ret;
+}
+
+static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
+ .master_xfer = dibx000_i2c_gated_tuner_xfer,
+ .functionality = dibx000_i2c_func,
+};
+
+struct i2c_adapter *dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst,
+ enum dibx000_i2c_interface intf,
+ int gating)
+{
+ struct i2c_adapter *i2c = NULL;
+
+ switch (intf) {
+ case DIBX000_I2C_INTERFACE_TUNER:
+ if (gating)
+ i2c = &mst->gated_tuner_i2c_adap;
+ break;
+ case DIBX000_I2C_INTERFACE_GPIO_1_2:
+ if (!gating)
+ i2c = &mst->master_i2c_adap_gpio12;
+ break;
+ case DIBX000_I2C_INTERFACE_GPIO_3_4:
+ if (!gating)
+ i2c = &mst->master_i2c_adap_gpio34;
+ break;
+ case DIBX000_I2C_INTERFACE_GPIO_6_7:
+ if (gating)
+ i2c = &mst->master_i2c_adap_gpio67;
+ break;
+ default:
+ pr_err("incorrect I2C interface selected\n");
+ break;
+ }
+
+ return i2c;
+}
+
+EXPORT_SYMBOL(dibx000_get_i2c_adapter);
+
+void dibx000_reset_i2c_master(struct dibx000_i2c_master *mst)
+{
+ /* initialize the i2c-master by closing the gate */
+ u8 tx[4];
+ struct i2c_msg m = {.addr = mst->i2c_addr,.buf = tx,.len = 4 };
+
+ dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
+ i2c_transfer(mst->i2c_adap, &m, 1);
+ mst->selected_interface = 0xff; // the first time force a select of the I2C
+ dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
+}
+
+EXPORT_SYMBOL(dibx000_reset_i2c_master);
+
+static int i2c_adapter_init(struct i2c_adapter *i2c_adap,
+ struct i2c_algorithm *algo, const char *name,
+ struct dibx000_i2c_master *mst)
+{
+ strscpy(i2c_adap->name, name, sizeof(i2c_adap->name));
+ i2c_adap->algo = algo;
+ i2c_adap->algo_data = NULL;
+ i2c_set_adapdata(i2c_adap, mst);
+ if (i2c_add_adapter(i2c_adap) < 0)
+ return -ENODEV;
+ return 0;
+}
+
+int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
+ struct i2c_adapter *i2c_adap, u8 i2c_addr)
+{
+ int ret;
+
+ mutex_init(&mst->i2c_buffer_lock);
+ if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) {
+ dprintk("could not acquire lock\n");
+ return -EINVAL;
+ }
+ memset(mst->msg, 0, sizeof(struct i2c_msg));
+ mst->msg[0].addr = i2c_addr >> 1;
+ mst->msg[0].flags = 0;
+ mst->msg[0].buf = mst->i2c_write_buffer;
+ mst->msg[0].len = 4;
+
+ mst->device_rev = device_rev;
+ mst->i2c_adap = i2c_adap;
+ mst->i2c_addr = i2c_addr >> 1;
+
+ if (device_rev == DIB7000P || device_rev == DIB8000)
+ mst->base_reg = 1024;
+ else
+ mst->base_reg = 768;
+
+ mst->gated_tuner_i2c_adap.dev.parent = mst->i2c_adap->dev.parent;
+ if (i2c_adapter_init
+ (&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo,
+ "DiBX000 tuner I2C bus", mst) != 0)
+ pr_err("could not initialize the tuner i2c_adapter\n");
+
+ mst->master_i2c_adap_gpio12.dev.parent = mst->i2c_adap->dev.parent;
+ if (i2c_adapter_init
+ (&mst->master_i2c_adap_gpio12, &dibx000_i2c_master_gpio12_xfer_algo,
+ "DiBX000 master GPIO12 I2C bus", mst) != 0)
+ pr_err("could not initialize the master i2c_adapter\n");
+
+ mst->master_i2c_adap_gpio34.dev.parent = mst->i2c_adap->dev.parent;
+ if (i2c_adapter_init
+ (&mst->master_i2c_adap_gpio34, &dibx000_i2c_master_gpio34_xfer_algo,
+ "DiBX000 master GPIO34 I2C bus", mst) != 0)
+ pr_err("could not initialize the master i2c_adapter\n");
+
+ mst->master_i2c_adap_gpio67.dev.parent = mst->i2c_adap->dev.parent;
+ if (i2c_adapter_init
+ (&mst->master_i2c_adap_gpio67, &dibx000_i2c_gated_gpio67_algo,
+ "DiBX000 master GPIO67 I2C bus", mst) != 0)
+ pr_err("could not initialize the master i2c_adapter\n");
+
+ /* initialize the i2c-master by closing the gate */
+ dibx000_i2c_gate_ctrl(mst, mst->i2c_write_buffer, 0, 0);
+
+ ret = (i2c_transfer(i2c_adap, mst->msg, 1) == 1);
+ mutex_unlock(&mst->i2c_buffer_lock);
+
+ return ret;
+}
+
+EXPORT_SYMBOL(dibx000_init_i2c_master);
+
+void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
+{
+ i2c_del_adapter(&mst->gated_tuner_i2c_adap);
+ i2c_del_adapter(&mst->master_i2c_adap_gpio12);
+ i2c_del_adapter(&mst->master_i2c_adap_gpio34);
+ i2c_del_adapter(&mst->master_i2c_adap_gpio67);
+}
+EXPORT_SYMBOL(dibx000_exit_i2c_master);
+
+MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@posteo.de>");
+MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 01:39:10 +0000