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[media] DiBx000: add addition i2c-interface names
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This patch adds the possibitity to use different I2C-ports to talk to
slave-devices than the standard ones.

Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <patrick.boettcher@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Olivier Grenie authored and Mauro Carvalho Chehab committed Mar 21, 2011
1 parent 4c70e07 commit b994d19
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Showing 2 changed files with 285 additions and 22 deletions.
284 changes: 271 additions & 13 deletions drivers/media/dvb/frontends/dibx000_common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,144 @@ static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
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 u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg)
{
u8 wb[2] = { reg >> 8, reg & 0xff };
u8 rb[2];
struct i2c_msg msg[2] = {
{.addr = mst->i2c_addr,.flags = 0,.buf = wb,.len = 2},
{.addr = mst->i2c_addr,.flags = I2C_M_RD,.buf = rb,.len = 2},
};

if (i2c_transfer(mst->i2c_adap, msg, 2) != 2)
dprintk("i2c read error on %d", reg);

return (rb[0] << 8) | rb[1];
}

static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst)
{
int i = 100; // max_i2c_polls;
u16 status;

while (((status = dibx000_read_word(mst, mst->base_reg + 2)) & 0x0100) == 0 && --i > 0);

/* i2c timed out */
if (i == 0)
return -EREMOTEIO;

/* no acknowledge */
if ((status & 0x0080) == 0)
return -EREMOTEIO;

return 0;
}

static int dibx000_master_i2c_write(struct dibx000_i2c_master *mst, struct i2c_msg *msg, u8 stop)
{
u16 data;
u16 da;
u16 i;
u16 txlen = msg->len, len;
const u8 *b = msg->buf;

while (txlen) {
dibx000_read_word(mst, mst->base_reg + 2); // reset fifo ptr

len = txlen > 8 ? 8 : txlen;
for (i = 0; i < len; i += 2) {
data = *b++ << 8;
if (i+1 < len)
data |= *b++;
dibx000_write_word(mst, mst->base_reg, data);
}
da = (((u8) (msg->addr)) << 9) | // addr
(1 << 8) | // master
(1 << 7) | // rq
(0 << 6) | // stop
(0 << 5) | // start
((len & 0x7) << 2) | // nb 8 bytes == 0 here
(0 << 1) | // rw
(0 << 0); // irqen

if (txlen == msg->len)
da |= 1 << 5; /* start */

if (txlen-len == 0 && stop)
da |= 1 << 6; /* stop */

dibx000_write_word(mst, mst->base_reg+1, da);

if (dibx000_is_i2c_done(mst) != 0)
return -EREMOTEIO;
txlen -= len;
}

return 0;
}

static int dibx000_master_i2c_read(struct dibx000_i2c_master *mst, struct i2c_msg *msg)
{
u16 da;
u8 *b = msg->buf;
u16 rxlen = msg->len, len;

while (rxlen) {
len = rxlen > 8 ? 8 : rxlen;
da = (((u8) (msg->addr)) << 9) | // addr
(1 << 8) | // master
(1 << 7) | // rq
(0 << 6) | // stop
(0 << 5) | // start
((len & 0x7) << 2) | // nb
(1 << 1) | // rw
(0 << 0); // irqen

if (rxlen == msg->len)
da |= 1 << 5; /* start */

if (rxlen-len == 0)
da |= 1 << 6; /* stop */
dibx000_write_word(mst, mst->base_reg+1, da);

if (dibx000_is_i2c_done(mst) != 0)
return -EREMOTEIO;

rxlen -= len;

while (len) {
da = dibx000_read_word(mst, mst->base_reg);
*b++ = (da >> 8) & 0xff;
len--;
if (len >= 1) {
*b++ = da & 0xff;
len--;
}
}
}

return 0;
}

int dibx000_i2c_set_speed(struct i2c_adapter *i2c_adap, u16 speed)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);

if (mst->device_rev < DIB7000MC && speed < 235)
speed = 235;
return dibx000_write_word(mst, mst->base_reg + 3, (u16)(60000 / speed));

}
EXPORT_SYMBOL(dibx000_i2c_set_speed);

static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_I2C;
}

static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst,
enum dibx000_i2c_interface intf)
Expand All @@ -32,6 +167,66 @@ static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst,
return 0;
}

static int dibx000_i2c_master_xfer_gpio12(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
int msg_index;
int ret = 0;

dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_1_2);
for (msg_index = 0; msg_index<num; msg_index++) {
if (msg[msg_index].flags & I2C_M_RD)
{
ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
if (ret != 0)
return 0;
}
else
{
ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
if (ret != 0)
return 0;
}
}

return num;
}

static int dibx000_i2c_master_xfer_gpio34(struct i2c_adapter *i2c_adap, struct i2c_msg msg[], int num)
{
struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
int msg_index;
int ret = 0;

dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_3_4);
for (msg_index = 0; msg_index<num; msg_index++) {
if (msg[msg_index].flags & I2C_M_RD)
{
ret = dibx000_master_i2c_read(mst, &msg[msg_index]);
if (ret != 0)
return 0;
}
else
{
ret = dibx000_master_i2c_write(mst, &msg[msg_index], 1);
if (ret != 0)
return 0;
}
}

return num;
}

static struct i2c_algorithm dibx000_i2c_master_gpio12_xfer_algo = {
.master_xfer = dibx000_i2c_master_xfer_gpio12,
.functionality = dibx000_i2c_func,
};

static struct i2c_algorithm dibx000_i2c_master_gpio34_xfer_algo = {
.master_xfer = dibx000_i2c_master_xfer_gpio34,
.functionality = dibx000_i2c_func,
};

static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4],
u8 addr, int onoff)
{
Expand All @@ -54,11 +249,37 @@ static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4],
return 0;
}

static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
static int dibx000_i2c_gated_gpio67_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg msg[], int num)
{
return I2C_FUNC_I2C;
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_GPIO_6_7);

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_gpio67_algo = {
.master_xfer = dibx000_i2c_gated_gpio67_xfer,
.functionality = dibx000_i2c_func,
};

static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg msg[], int num)
{
Expand Down Expand Up @@ -91,8 +312,8 @@ static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
};

struct i2c_adapter *dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst,
enum dibx000_i2c_interface intf,
int gating)
enum dibx000_i2c_interface intf,
int gating)
{
struct i2c_adapter *i2c = NULL;

Expand All @@ -101,6 +322,18 @@ struct i2c_adapter *dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst,
if (gating)
i2c = &mst->gated_tuner_i2c_adap;
break;
case DIBX000_I2C_INTERFACE_GPIO_1_2:
if (!gating)
i2c = &mst->master_i2c_adap_gpio12;
break;
case DIBX000_I2C_INTERFACE_GPIO_3_4:
if (!gating)
i2c = &mst->master_i2c_adap_gpio34;
break;
case DIBX000_I2C_INTERFACE_GPIO_6_7:
if (gating)
i2c = &mst->master_i2c_adap_gpio67;
break;
default:
printk(KERN_ERR "DiBX000: incorrect I2C interface selected\n");
break;
Expand All @@ -126,8 +359,8 @@ void dibx000_reset_i2c_master(struct dibx000_i2c_master *mst)
EXPORT_SYMBOL(dibx000_reset_i2c_master);

static int i2c_adapter_init(struct i2c_adapter *i2c_adap,
struct i2c_algorithm *algo, const char *name,
struct dibx000_i2c_master *mst)
struct i2c_algorithm *algo, const char *name,
struct dibx000_i2c_master *mst)
{
strncpy(i2c_adap->name, name, sizeof(i2c_adap->name));
i2c_adap->algo = algo;
Expand All @@ -139,7 +372,7 @@ static int i2c_adapter_init(struct i2c_adapter *i2c_adap,
}

int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
struct i2c_adapter *i2c_adap, u8 i2c_addr)
struct i2c_adapter *i2c_adap, u8 i2c_addr)
{
u8 tx[4];
struct i2c_msg m = {.addr = i2c_addr >> 1,.buf = tx,.len = 4 };
Expand All @@ -153,11 +386,33 @@ int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
else
mst->base_reg = 768;

mst->gated_tuner_i2c_adap.dev.parent = mst->i2c_adap->dev.parent;
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");

mst->master_i2c_adap_gpio12.dev.parent = mst->i2c_adap->dev.parent;
if (i2c_adapter_init
(&mst->master_i2c_adap_gpio12, &dibx000_i2c_master_gpio12_xfer_algo,
"DiBX000 master GPIO12 I2C bus", mst) != 0)
printk(KERN_ERR
"DiBX000: could not initialize the master i2c_adapter\n");

mst->master_i2c_adap_gpio34.dev.parent = mst->i2c_adap->dev.parent;
if (i2c_adapter_init
(&mst->master_i2c_adap_gpio34, &dibx000_i2c_master_gpio34_xfer_algo,
"DiBX000 master GPIO34 I2C bus", mst) != 0)
printk(KERN_ERR
"DiBX000: could not initialize the master i2c_adapter\n");

mst->master_i2c_adap_gpio67.dev.parent = mst->i2c_adap->dev.parent;
if (i2c_adapter_init
(&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo,
"DiBX000 tuner I2C bus", mst) != 0)
(&mst->master_i2c_adap_gpio67, &dibx000_i2c_gated_gpio67_algo,
"DiBX000 master GPIO67 I2C bus", mst) != 0)
printk(KERN_ERR
"DiBX000: could not initialize the tuner i2c_adapter\n");
"DiBX000: could not initialize the master i2c_adapter\n");

/* initialize the i2c-master by closing the gate */
dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
Expand All @@ -170,16 +425,19 @@ EXPORT_SYMBOL(dibx000_init_i2c_master);
void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
{
i2c_del_adapter(&mst->gated_tuner_i2c_adap);
i2c_del_adapter(&mst->master_i2c_adap_gpio12);
i2c_del_adapter(&mst->master_i2c_adap_gpio34);
i2c_del_adapter(&mst->master_i2c_adap_gpio67);
}
EXPORT_SYMBOL(dibx000_exit_i2c_master);


u32 systime(void)
{
struct timespec t;
struct timespec t;

t = current_kernel_time();
return (t.tv_sec * 10000) + (t.tv_nsec / 100000);
t = current_kernel_time();
return (t.tv_sec * 10000) + (t.tv_nsec / 100000);
}
EXPORT_SYMBOL(systime);

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