1 files changed, 288 insertions, 0 deletions

diff --git a/drivers/media/dvb/b2c2/flexcop-i2c.c b/drivers/media/dvb/b2c2/flexcop-i2c.c
new file mode 100644
index 00000000000..965d5eb3375
--- /dev/null
+++ b/drivers/media/dvb/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;
+}