1 files changed, 152 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 000000000000..a18c8f45a2ee
--- /dev/null
+++ b/drivers/media/dvb/frontends/dibx000_common.c
@@ -0,0 +1,152 @@
+#include <linux/i2c.h>
+
+#include "dibx000_common.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");
+
+#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiBX000: "); printk(args); } } while (0)
+
+static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
+{
+        u8 b[4] = {
+                (reg >> 8) & 0xff, reg & 0xff,
+                (val >> 8) & 0xff, val & 0xff,
+        };
+        struct i2c_msg msg = {
+                .addr = mst->i2c_addr, .flags = 0, .buf = b, .len = 4
+        };
+        return i2c_transfer(mst->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
+}
+
+
+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_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 u32 dibx000_i2c_func(struct i2c_adapter *adapter)
+{
+        return I2C_FUNC_I2C;
+}
+
+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);
+        struct i2c_msg m[2 + num];
+        u8 tx_open[4], tx_close[4];
+
+        memset(m,0, sizeof(struct i2c_msg) * (2 + num));
+
+        dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
+
+        dibx000_i2c_gate_ctrl(mst, tx_open,  msg[0].addr, 1);
+        m[0].addr = mst->i2c_addr;
+        m[0].buf  = tx_open;
+        m[0].len  = 4;
+
+        memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);
+
+        dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
+        m[num+1].addr = mst->i2c_addr;
+        m[num+1].buf  = tx_close;
+        m[num+1].len  = 4;
+
+        return i2c_transfer(mst->i2c_adap, m, 2+num) == 2 + num ? num : -EIO;
+}
+
+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;
+                default:
+                        printk(KERN_ERR "DiBX000: incorrect I2C interface selected\n");
+                        break;
+        }
+
+        return i2c;
+}
+EXPORT_SYMBOL(dibx000_get_i2c_adapter);
+
+static int i2c_adapter_init(struct i2c_adapter *i2c_adap, struct i2c_algorithm *algo, const char name[I2C_NAME_SIZE], struct dibx000_i2c_master *mst)
+{
+        strncpy(i2c_adap->name, name, I2C_NAME_SIZE);
+        i2c_adap->class     = I2C_CLASS_TV_DIGITAL,
+        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)
+{
+        u8 tx[4];
+        struct i2c_msg m = { .addr = i2c_addr >> 1, .buf = tx, .len = 4 };
+
+        mst->device_rev = device_rev;
+        mst->i2c_adap   = i2c_adap;
+        mst->i2c_addr   = i2c_addr >> 1;
+
+        if (device_rev == DIB7000P)
+                mst->base_reg = 1024;
+        else
+                mst->base_reg = 768;
+
+    if (i2c_adapter_init(&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo, "DiBX000 tuner I2C bus", mst) != 0)
+                printk(KERN_ERR "DiBX000: could not initialize the tuner i2c_adapter\n");
+
+        /* initialize the i2c-master by closing the gate */
+        dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
+
+        return i2c_transfer(i2c_adap, &m, 1) == 1;
+}
+EXPORT_SYMBOL(dibx000_init_i2c_master);
+
+void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
+{
+        i2c_del_adapter(&mst->gated_tuner_i2c_adap);
+}
+EXPORT_SYMBOL(dibx000_exit_i2c_master);
+
+MODULE_AUTHOR("Patrick Boettcher <pboettcher@dibcom.fr>");
+MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
+MODULE_LICENSE("GPL");