153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
#include <linux/i2c.h>
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#include "dibx000_common.h"
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");
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#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiBX000: "); printk(args); } } while (0)
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static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
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{
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u8 b[4] = {
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(reg >> 8) & 0xff, reg & 0xff,
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(val >> 8) & 0xff, val & 0xff,
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};
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struct i2c_msg msg = {
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.addr = mst->i2c_addr, .flags = 0, .buf = b, .len = 4
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};
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return i2c_transfer(mst->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
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}
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static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst, enum dibx000_i2c_interface intf)
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{
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if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) {
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dprintk("selecting interface: %d\n",intf);
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mst->selected_interface = intf;
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return dibx000_write_word(mst, mst->base_reg + 4, intf);
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}
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return 0;
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}
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static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4], u8 addr, int onoff)
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{
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u16 val;
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if (onoff)
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val = addr << 8; // bit 7 = use master or not, if 0, the gate is open
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else
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val = 1 << 7;
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if (mst->device_rev > DIB7000)
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val <<= 1;
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tx[0] = (((mst->base_reg + 1) >> 8) & 0xff);
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tx[1] = ( (mst->base_reg + 1) & 0xff);
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tx[2] = val >> 8;
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tx[3] = val & 0xff;
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return 0;
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}
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static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C;
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}
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static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
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{
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struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
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struct i2c_msg m[2 + num];
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u8 tx_open[4], tx_close[4];
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memset(m,0, sizeof(struct i2c_msg) * (2 + num));
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dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
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dibx000_i2c_gate_ctrl(mst, tx_open, msg[0].addr, 1);
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m[0].addr = mst->i2c_addr;
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m[0].buf = tx_open;
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m[0].len = 4;
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memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);
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dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
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m[num+1].addr = mst->i2c_addr;
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m[num+1].buf = tx_close;
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m[num+1].len = 4;
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return i2c_transfer(mst->i2c_adap, m, 2+num) == 2 + num ? num : -EIO;
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}
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static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
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.master_xfer = dibx000_i2c_gated_tuner_xfer,
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.functionality = dibx000_i2c_func,
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};
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struct i2c_adapter * dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst, enum dibx000_i2c_interface intf, int gating)
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{
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struct i2c_adapter *i2c = NULL;
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switch (intf) {
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case DIBX000_I2C_INTERFACE_TUNER:
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if (gating)
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i2c = &mst->gated_tuner_i2c_adap;
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break;
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default:
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printk(KERN_ERR "DiBX000: incorrect I2C interface selected\n");
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break;
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}
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return i2c;
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}
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EXPORT_SYMBOL(dibx000_get_i2c_adapter);
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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)
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{
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strncpy(i2c_adap->name, name, I2C_NAME_SIZE);
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i2c_adap->class = I2C_CLASS_TV_DIGITAL,
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i2c_adap->algo = algo;
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i2c_adap->algo_data = NULL;
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i2c_set_adapdata(i2c_adap, mst);
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if (i2c_add_adapter(i2c_adap) < 0)
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return -ENODEV;
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return 0;
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}
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int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev, struct i2c_adapter *i2c_adap, u8 i2c_addr)
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{
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u8 tx[4];
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struct i2c_msg m = { .addr = i2c_addr >> 1, .buf = tx, .len = 4 };
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mst->device_rev = device_rev;
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mst->i2c_adap = i2c_adap;
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mst->i2c_addr = i2c_addr >> 1;
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if (device_rev == DIB7000P)
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mst->base_reg = 1024;
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else
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mst->base_reg = 768;
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if (i2c_adapter_init(&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo, "DiBX000 tuner I2C bus", mst) != 0)
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printk(KERN_ERR "DiBX000: could not initialize the tuner i2c_adapter\n");
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/* initialize the i2c-master by closing the gate */
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dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
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return i2c_transfer(i2c_adap, &m, 1) == 1;
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}
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EXPORT_SYMBOL(dibx000_init_i2c_master);
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void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
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{
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i2c_del_adapter(&mst->gated_tuner_i2c_adap);
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}
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EXPORT_SYMBOL(dibx000_exit_i2c_master);
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MODULE_AUTHOR("Patrick Boettcher <pboettcher@dibcom.fr>");
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MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
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MODULE_LICENSE("GPL");
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