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path: root/drivers/media/pci/b2c2/flexcop-i2c.c
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Diffstat (limited to 'drivers/media/pci/b2c2/flexcop-i2c.c')
-rw-r--r--drivers/media/pci/b2c2/flexcop-i2c.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/drivers/media/pci/b2c2/flexcop-i2c.c b/drivers/media/pci/b2c2/flexcop-i2c.c
new file mode 100644
index 000000000000..965d5eb33752
--- /dev/null
+++ b/drivers/media/pci/b2c2/flexcop-i2c.c
@@ -0,0 +1,288 @@
+/*
+ * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
+ * flexcop-i2c.c - flexcop internal 2Wire bus (I2C) and dvb i2c initialization
+ * see flexcop.c for copyright information
+ */
+#include "flexcop.h"
+
+#define FC_MAX_I2C_RETRIES 100000
+
+static int flexcop_i2c_operation(struct flexcop_device *fc,
+ flexcop_ibi_value *r100)
+{
+ int i;
+ flexcop_ibi_value r;
+
+ r100->tw_sm_c_100.working_start = 1;
+ deb_i2c("r100 before: %08x\n",r100->raw);
+
+ fc->write_ibi_reg(fc, tw_sm_c_100, ibi_zero);
+ fc->write_ibi_reg(fc, tw_sm_c_100, *r100); /* initiating i2c operation */
+
+ for (i = 0; i < FC_MAX_I2C_RETRIES; i++) {
+ r = fc->read_ibi_reg(fc, tw_sm_c_100);
+
+ if (!r.tw_sm_c_100.no_base_addr_ack_error) {
+ if (r.tw_sm_c_100.st_done) {
+ *r100 = r;
+ deb_i2c("i2c success\n");
+ return 0;
+ }
+ } else {
+ deb_i2c("suffering from an i2c ack_error\n");
+ return -EREMOTEIO;
+ }
+ }
+ deb_i2c("tried %d times i2c operation, "
+ "never finished or too many ack errors.\n", i);
+ return -EREMOTEIO;
+}
+
+static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c,
+ flexcop_ibi_value r100, u8 *buf)
+{
+ flexcop_ibi_value r104;
+ int len = r100.tw_sm_c_100.total_bytes,
+ /* remember total_bytes is buflen-1 */
+ ret;
+
+ /* work-around to have CableStar2 and SkyStar2 rev 2.7 work
+ * correctly:
+ *
+ * the ITD1000 is behind an i2c-gate which closes automatically
+ * after an i2c-transaction the STV0297 needs 2 consecutive reads
+ * one with no_base_addr = 0 and one with 1
+ *
+ * those two work-arounds are conflictin: we check for the card
+ * type, it is set when probing the ITD1000 */
+ if (i2c->fc->dev_type == FC_SKY_REV27)
+ r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
+
+ ret = flexcop_i2c_operation(i2c->fc, &r100);
+ if (ret != 0) {
+ deb_i2c("Retrying operation\n");
+ r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
+ ret = flexcop_i2c_operation(i2c->fc, &r100);
+ }
+ if (ret != 0) {
+ deb_i2c("read failed. %d\n", ret);
+ return ret;
+ }
+
+ buf[0] = r100.tw_sm_c_100.data1_reg;
+
+ if (len > 0) {
+ r104 = i2c->fc->read_ibi_reg(i2c->fc, tw_sm_c_104);
+ deb_i2c("read: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
+
+ /* there is at least one more byte, otherwise we wouldn't be here */
+ buf[1] = r104.tw_sm_c_104.data2_reg;
+ if (len > 1) buf[2] = r104.tw_sm_c_104.data3_reg;
+ if (len > 2) buf[3] = r104.tw_sm_c_104.data4_reg;
+ }
+ return 0;
+}
+
+static int flexcop_i2c_write4(struct flexcop_device *fc,
+ flexcop_ibi_value r100, u8 *buf)
+{
+ flexcop_ibi_value r104;
+ int len = r100.tw_sm_c_100.total_bytes; /* remember total_bytes is buflen-1 */
+ r104.raw = 0;
+
+ /* there is at least one byte, otherwise we wouldn't be here */
+ r100.tw_sm_c_100.data1_reg = buf[0];
+ r104.tw_sm_c_104.data2_reg = len > 0 ? buf[1] : 0;
+ r104.tw_sm_c_104.data3_reg = len > 1 ? buf[2] : 0;
+ r104.tw_sm_c_104.data4_reg = len > 2 ? buf[3] : 0;
+
+ deb_i2c("write: r100: %08x, r104: %08x\n", r100.raw, r104.raw);
+
+ /* write the additional i2c data before doing the actual i2c operation */
+ fc->write_ibi_reg(fc, tw_sm_c_104, r104);
+ return flexcop_i2c_operation(fc, &r100);
+}
+
+int flexcop_i2c_request(struct flexcop_i2c_adapter *i2c,
+ flexcop_access_op_t op, u8 chipaddr, u8 addr, u8 *buf, u16 len)
+{
+ int ret;
+
+#ifdef DUMP_I2C_MESSAGES
+ int i;
+#endif
+
+ u16 bytes_to_transfer;
+ flexcop_ibi_value r100;
+
+ deb_i2c("op = %d\n",op);
+ r100.raw = 0;
+ r100.tw_sm_c_100.chipaddr = chipaddr;
+ r100.tw_sm_c_100.twoWS_rw = op;
+ r100.tw_sm_c_100.twoWS_port_reg = i2c->port;
+
+#ifdef DUMP_I2C_MESSAGES
+ printk(KERN_DEBUG "%d ", i2c->port);
+ if (op == FC_READ)
+ printk("rd(");
+ else
+ printk("wr(");
+ printk("%02x): %02x ", chipaddr, addr);
+#endif
+
+ /* in that case addr is the only value ->
+ * we write it twice as baseaddr and val0
+ * BBTI is doing it like that for ISL6421 at least */
+ if (i2c->no_base_addr && len == 0 && op == FC_WRITE) {
+ buf = &addr;
+ len = 1;
+ }
+
+ while (len != 0) {
+ bytes_to_transfer = len > 4 ? 4 : len;
+
+ r100.tw_sm_c_100.total_bytes = bytes_to_transfer - 1;
+ r100.tw_sm_c_100.baseaddr = addr;
+
+ if (op == FC_READ)
+ ret = flexcop_i2c_read4(i2c, r100, buf);
+ else
+ ret = flexcop_i2c_write4(i2c->fc, r100, buf);
+
+#ifdef DUMP_I2C_MESSAGES
+ for (i = 0; i < bytes_to_transfer; i++)
+ printk("%02x ", buf[i]);
+#endif
+
+ if (ret < 0)
+ return ret;
+
+ buf += bytes_to_transfer;
+ addr += bytes_to_transfer;
+ len -= bytes_to_transfer;
+ }
+
+#ifdef DUMP_I2C_MESSAGES
+ printk("\n");
+#endif
+
+ return 0;
+}
+/* exported for PCI i2c */
+EXPORT_SYMBOL(flexcop_i2c_request);
+
+/* master xfer callback for demodulator */
+static int flexcop_master_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct flexcop_i2c_adapter *i2c = i2c_get_adapdata(i2c_adap);
+ int i, ret = 0;
+
+ /* Some drivers use 1 byte or 0 byte reads as probes, which this
+ * driver doesn't support. These probes will always fail, so this
+ * hack makes them always succeed. If one knew how, it would of
+ * course be better to actually do the read. */
+ if (num == 1 && msgs[0].flags == I2C_M_RD && msgs[0].len <= 1)
+ return 1;
+
+ if (mutex_lock_interruptible(&i2c->fc->i2c_mutex))
+ return -ERESTARTSYS;
+
+ for (i = 0; i < num; i++) {
+ /* reading */
+ if (i+1 < num && (msgs[i+1].flags == I2C_M_RD)) {
+ ret = i2c->fc->i2c_request(i2c, FC_READ, msgs[i].addr,
+ msgs[i].buf[0], msgs[i+1].buf,
+ msgs[i+1].len);
+ i++; /* skip the following message */
+ } else /* writing */
+ ret = i2c->fc->i2c_request(i2c, FC_WRITE, msgs[i].addr,
+ msgs[i].buf[0], &msgs[i].buf[1],
+ msgs[i].len - 1);
+ if (ret < 0) {
+ deb_i2c("i2c master_xfer failed");
+ break;
+ }
+ }
+
+ mutex_unlock(&i2c->fc->i2c_mutex);
+
+ if (ret == 0)
+ ret = num;
+ return ret;
+}
+
+static u32 flexcop_i2c_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C;
+}
+
+static struct i2c_algorithm flexcop_algo = {
+ .master_xfer = flexcop_master_xfer,
+ .functionality = flexcop_i2c_func,
+};
+
+int flexcop_i2c_init(struct flexcop_device *fc)
+{
+ int ret;
+ mutex_init(&fc->i2c_mutex);
+
+ fc->fc_i2c_adap[0].fc = fc;
+ fc->fc_i2c_adap[1].fc = fc;
+ fc->fc_i2c_adap[2].fc = fc;
+ fc->fc_i2c_adap[0].port = FC_I2C_PORT_DEMOD;
+ fc->fc_i2c_adap[1].port = FC_I2C_PORT_EEPROM;
+ fc->fc_i2c_adap[2].port = FC_I2C_PORT_TUNER;
+
+ strlcpy(fc->fc_i2c_adap[0].i2c_adap.name, "B2C2 FlexCop I2C to demod",
+ sizeof(fc->fc_i2c_adap[0].i2c_adap.name));
+ strlcpy(fc->fc_i2c_adap[1].i2c_adap.name, "B2C2 FlexCop I2C to eeprom",
+ sizeof(fc->fc_i2c_adap[1].i2c_adap.name));
+ strlcpy(fc->fc_i2c_adap[2].i2c_adap.name, "B2C2 FlexCop I2C to tuner",
+ sizeof(fc->fc_i2c_adap[2].i2c_adap.name));
+
+ i2c_set_adapdata(&fc->fc_i2c_adap[0].i2c_adap, &fc->fc_i2c_adap[0]);
+ i2c_set_adapdata(&fc->fc_i2c_adap[1].i2c_adap, &fc->fc_i2c_adap[1]);
+ i2c_set_adapdata(&fc->fc_i2c_adap[2].i2c_adap, &fc->fc_i2c_adap[2]);
+
+ fc->fc_i2c_adap[0].i2c_adap.algo =
+ fc->fc_i2c_adap[1].i2c_adap.algo =
+ fc->fc_i2c_adap[2].i2c_adap.algo = &flexcop_algo;
+ fc->fc_i2c_adap[0].i2c_adap.algo_data =
+ fc->fc_i2c_adap[1].i2c_adap.algo_data =
+ fc->fc_i2c_adap[2].i2c_adap.algo_data = NULL;
+ fc->fc_i2c_adap[0].i2c_adap.dev.parent =
+ fc->fc_i2c_adap[1].i2c_adap.dev.parent =
+ fc->fc_i2c_adap[2].i2c_adap.dev.parent = fc->dev;
+
+ ret = i2c_add_adapter(&fc->fc_i2c_adap[0].i2c_adap);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_add_adapter(&fc->fc_i2c_adap[1].i2c_adap);
+ if (ret < 0)
+ goto adap_1_failed;
+
+ ret = i2c_add_adapter(&fc->fc_i2c_adap[2].i2c_adap);
+ if (ret < 0)
+ goto adap_2_failed;
+
+ fc->init_state |= FC_STATE_I2C_INIT;
+ return 0;
+
+adap_2_failed:
+ i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
+adap_1_failed:
+ i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
+ return ret;
+}
+
+void flexcop_i2c_exit(struct flexcop_device *fc)
+{
+ if (fc->init_state & FC_STATE_I2C_INIT) {
+ i2c_del_adapter(&fc->fc_i2c_adap[2].i2c_adap);
+ i2c_del_adapter(&fc->fc_i2c_adap[1].i2c_adap);
+ i2c_del_adapter(&fc->fc_i2c_adap[0].i2c_adap);
+ }
+ fc->init_state &= ~FC_STATE_I2C_INIT;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 03:26:43 +0100