8d04df4997
Prevent NULL dereference if kmalloc() fails. Cc: Markus Rechberger <mrechberger@sundtek.de> Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
380 lines
7.8 KiB
C
380 lines
7.8 KiB
C
/*
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* Driver for LG ATSC lgdt3304 driver
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*
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* Copyright (C) 2008 Markus Rechberger <mrechberger@sundtek.de>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include "dvb_frontend.h"
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#include "lgdt3304.h"
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static unsigned int debug = 0;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug,"lgdt3304 debugging (default off)");
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#define dprintk(fmt, args...) if (debug) do {\
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printk("lgdt3304 debug: " fmt, ##args); } while (0)
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struct lgdt3304_state
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{
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struct dvb_frontend frontend;
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fe_modulation_t current_modulation;
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__u32 snr;
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__u32 current_frequency;
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__u8 addr;
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struct i2c_adapter *i2c;
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};
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static int i2c_write_demod_bytes (struct dvb_frontend *fe, __u8 *buf, int len)
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{
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struct lgdt3304_state *state = fe->demodulator_priv;
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struct i2c_msg i2cmsgs = {
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.addr = state->addr,
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.flags = 0,
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.len = 3,
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.buf = buf
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};
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int i;
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int err;
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for (i=0; i<len-1; i+=3){
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if((err = i2c_transfer(state->i2c, &i2cmsgs, 1))<0) {
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printk("%s i2c_transfer error %d\n", __func__, err);
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if (err < 0)
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return err;
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else
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return -EREMOTEIO;
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}
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i2cmsgs.buf += 3;
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}
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return 0;
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}
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static int lgdt3304_i2c_read_reg(struct dvb_frontend *fe, unsigned int reg)
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{
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struct lgdt3304_state *state = fe->demodulator_priv;
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struct i2c_msg i2cmsgs[2];
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int ret;
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__u8 buf;
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__u8 regbuf[2] = { reg>>8, reg&0xff };
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i2cmsgs[0].addr = state->addr;
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i2cmsgs[0].flags = 0;
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i2cmsgs[0].len = 2;
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i2cmsgs[0].buf = regbuf;
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i2cmsgs[1].addr = state->addr;
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i2cmsgs[1].flags = I2C_M_RD;
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i2cmsgs[1].len = 1;
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i2cmsgs[1].buf = &buf;
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if((ret = i2c_transfer(state->i2c, i2cmsgs, 2))<0) {
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printk("%s i2c_transfer error %d\n", __func__, ret);
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return ret;
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}
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return buf;
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}
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static int lgdt3304_i2c_write_reg(struct dvb_frontend *fe, int reg, int val)
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{
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struct lgdt3304_state *state = fe->demodulator_priv;
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char buffer[3] = { reg>>8, reg&0xff, val };
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int ret;
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struct i2c_msg i2cmsgs = {
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.addr = state->addr,
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.flags = 0,
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.len = 3,
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.buf=buffer
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};
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ret = i2c_transfer(state->i2c, &i2cmsgs, 1);
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if (ret != 1) {
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printk("%s i2c_transfer error %d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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static int lgdt3304_soft_Reset(struct dvb_frontend *fe)
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{
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lgdt3304_i2c_write_reg(fe, 0x0002, 0x9a);
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lgdt3304_i2c_write_reg(fe, 0x0002, 0x9b);
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mdelay(200);
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return 0;
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}
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static int lgdt3304_set_parameters(struct dvb_frontend *fe, struct dvb_frontend_parameters *param) {
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int err = 0;
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static __u8 lgdt3304_vsb8_data[] = {
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/* 16bit , 8bit */
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/* regs , val */
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0x00, 0x00, 0x02,
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0x00, 0x00, 0x13,
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0x00, 0x0d, 0x02,
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0x00, 0x0e, 0x02,
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0x00, 0x12, 0x32,
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0x00, 0x13, 0xc4,
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0x01, 0x12, 0x17,
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0x01, 0x13, 0x15,
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0x01, 0x14, 0x18,
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0x01, 0x15, 0xff,
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0x01, 0x16, 0x2c,
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0x02, 0x14, 0x67,
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0x02, 0x24, 0x8d,
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0x04, 0x27, 0x12,
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0x04, 0x28, 0x4f,
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0x03, 0x08, 0x80,
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0x03, 0x09, 0x00,
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0x03, 0x0d, 0x00,
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0x03, 0x0e, 0x1c,
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0x03, 0x14, 0xe1,
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0x05, 0x0e, 0x5b,
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};
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/* not yet tested .. */
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static __u8 lgdt3304_qam64_data[] = {
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/* 16bit , 8bit */
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/* regs , val */
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0x00, 0x00, 0x18,
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0x00, 0x0d, 0x02,
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//0x00, 0x0e, 0x02,
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0x00, 0x12, 0x2a,
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0x00, 0x13, 0x00,
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0x03, 0x14, 0xe3,
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0x03, 0x0e, 0x1c,
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0x03, 0x08, 0x66,
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0x03, 0x09, 0x66,
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0x03, 0x0a, 0x08,
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0x03, 0x0b, 0x9b,
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0x05, 0x0e, 0x5b,
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};
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/* tested with KWorld a340 */
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static __u8 lgdt3304_qam256_data[] = {
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/* 16bit , 8bit */
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/* regs , val */
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0x00, 0x00, 0x01, //0x19,
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0x00, 0x12, 0x2a,
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0x00, 0x13, 0x80,
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0x00, 0x0d, 0x02,
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0x03, 0x14, 0xe3,
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0x03, 0x0e, 0x1c,
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0x03, 0x08, 0x66,
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0x03, 0x09, 0x66,
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0x03, 0x0a, 0x08,
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0x03, 0x0b, 0x9b,
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0x03, 0x0d, 0x14,
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//0x05, 0x0e, 0x5b,
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0x01, 0x06, 0x4a,
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0x01, 0x07, 0x3d,
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0x01, 0x08, 0x70,
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0x01, 0x09, 0xa3,
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0x05, 0x04, 0xfd,
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0x00, 0x0d, 0x82,
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0x05, 0x0e, 0x5b,
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0x05, 0x0e, 0x5b,
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0x00, 0x02, 0x9a,
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0x00, 0x02, 0x9b,
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0x00, 0x00, 0x01,
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0x00, 0x12, 0x2a,
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0x00, 0x13, 0x80,
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0x00, 0x0d, 0x02,
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0x03, 0x14, 0xe3,
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0x03, 0x0e, 0x1c,
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0x03, 0x08, 0x66,
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0x03, 0x09, 0x66,
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0x03, 0x0a, 0x08,
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0x03, 0x0b, 0x9b,
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0x03, 0x0d, 0x14,
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0x01, 0x06, 0x4a,
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0x01, 0x07, 0x3d,
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0x01, 0x08, 0x70,
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0x01, 0x09, 0xa3,
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0x05, 0x04, 0xfd,
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0x00, 0x0d, 0x82,
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0x05, 0x0e, 0x5b,
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};
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struct lgdt3304_state *state = fe->demodulator_priv;
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if (state->current_modulation != param->u.vsb.modulation) {
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switch(param->u.vsb.modulation) {
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case VSB_8:
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err = i2c_write_demod_bytes(fe, lgdt3304_vsb8_data,
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sizeof(lgdt3304_vsb8_data));
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break;
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case QAM_64:
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err = i2c_write_demod_bytes(fe, lgdt3304_qam64_data,
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sizeof(lgdt3304_qam64_data));
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break;
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case QAM_256:
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err = i2c_write_demod_bytes(fe, lgdt3304_qam256_data,
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sizeof(lgdt3304_qam256_data));
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break;
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default:
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break;
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}
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if (err) {
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printk("%s error setting modulation\n", __func__);
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} else {
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state->current_modulation = param->u.vsb.modulation;
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}
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}
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state->current_frequency = param->frequency;
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lgdt3304_soft_Reset(fe);
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if (fe->ops.tuner_ops.set_params)
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fe->ops.tuner_ops.set_params(fe, param);
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return 0;
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}
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static int lgdt3304_init(struct dvb_frontend *fe) {
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return 0;
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}
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static int lgdt3304_sleep(struct dvb_frontend *fe) {
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return 0;
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}
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static int lgdt3304_read_status(struct dvb_frontend *fe, fe_status_t *status)
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{
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struct lgdt3304_state *state = fe->demodulator_priv;
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int r011d;
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int qam_lck;
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*status = 0;
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dprintk("lgdt read status\n");
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r011d = lgdt3304_i2c_read_reg(fe, 0x011d);
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dprintk("%02x\n", r011d);
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switch(state->current_modulation) {
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case VSB_8:
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if (r011d & 0x80) {
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dprintk("VSB Locked\n");
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*status |= FE_HAS_CARRIER;
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*status |= FE_HAS_LOCK;
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*status |= FE_HAS_SYNC;
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*status |= FE_HAS_SIGNAL;
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}
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break;
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case QAM_64:
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case QAM_256:
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qam_lck = r011d & 0x7;
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switch(qam_lck) {
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case 0x0: dprintk("Unlock\n");
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break;
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case 0x4: dprintk("1st Lock in acquisition state\n");
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break;
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case 0x6: dprintk("2nd Lock in acquisition state\n");
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break;
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case 0x7: dprintk("Final Lock in good reception state\n");
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*status |= FE_HAS_CARRIER;
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*status |= FE_HAS_LOCK;
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*status |= FE_HAS_SYNC;
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*status |= FE_HAS_SIGNAL;
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break;
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}
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break;
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default:
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printk("%s unhandled modulation\n", __func__);
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}
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return 0;
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}
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static int lgdt3304_read_ber(struct dvb_frontend *fe, __u32 *ber)
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{
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dprintk("read ber\n");
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return 0;
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}
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static int lgdt3304_read_snr(struct dvb_frontend *fe, __u16 *snr)
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{
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dprintk("read snr\n");
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return 0;
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}
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static int lgdt3304_read_ucblocks(struct dvb_frontend *fe, __u32 *ucblocks)
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{
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dprintk("read ucblocks\n");
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return 0;
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}
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static void lgdt3304_release(struct dvb_frontend *fe)
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{
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struct lgdt3304_state *state = (struct lgdt3304_state *)fe->demodulator_priv;
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kfree(state);
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}
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static struct dvb_frontend_ops demod_lgdt3304={
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.info = {
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.name = "LG 3304",
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.type = FE_ATSC,
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.frequency_min = 54000000,
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.frequency_max = 858000000,
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.frequency_stepsize = 62500,
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.symbol_rate_min = 5056941,
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.symbol_rate_max = 10762000,
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.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
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},
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.init = lgdt3304_init,
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.sleep = lgdt3304_sleep,
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.set_frontend = lgdt3304_set_parameters,
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.read_snr = lgdt3304_read_snr,
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.read_ber = lgdt3304_read_ber,
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.read_status = lgdt3304_read_status,
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.read_ucblocks = lgdt3304_read_ucblocks,
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.release = lgdt3304_release,
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};
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struct dvb_frontend* lgdt3304_attach(const struct lgdt3304_config *config,
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struct i2c_adapter *i2c)
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{
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struct lgdt3304_state *state;
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state = kzalloc(sizeof(struct lgdt3304_state), GFP_KERNEL);
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if (state == NULL)
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return NULL;
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state->addr = config->i2c_address;
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state->i2c = i2c;
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memcpy(&state->frontend.ops, &demod_lgdt3304, sizeof(struct dvb_frontend_ops));
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state->frontend.demodulator_priv = state;
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return &state->frontend;
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}
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EXPORT_SYMBOL_GPL(lgdt3304_attach);
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MODULE_AUTHOR("Markus Rechberger <mrechberger@empiatech.com>");
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MODULE_DESCRIPTION("LGE LGDT3304 DVB-T demodulator driver");
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MODULE_LICENSE("GPL");
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