diff options
Diffstat (limited to 'drivers/media/dvb-frontends/dibx000_common.c')
| -rw-r--r-- | drivers/media/dvb-frontends/dibx000_common.c | 515 |
1 files changed, 515 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 0000000..43be723 --- /dev/null +++ b/drivers/media/dvb-frontends/dibx000_common.c @@ -0,0 +1,515 @@ +#include <linux/i2c.h> +#include <linux/mutex.h> +#include <linux/module.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); printk("\n"); } } while (0) + +static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val) +{ + int ret; + + if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) { + dprintk("could not acquire lock"); + return -EINVAL; + } + + mst->i2c_write_buffer[0] = (reg >> 8) & 0xff; + mst->i2c_write_buffer[1] = reg & 0xff; + mst->i2c_write_buffer[2] = (val >> 8) & 0xff; + mst->i2c_write_buffer[3] = val & 0xff; + + memset(mst->msg, 0, sizeof(struct i2c_msg)); + mst->msg[0].addr = mst->i2c_addr; + mst->msg[0].flags = 0; + mst->msg[0].buf = mst->i2c_write_buffer; + mst->msg[0].len = 4; + + ret = i2c_transfer(mst->i2c_adap, mst->msg, 1) != 1 ? -EREMOTEIO : 0; + mutex_unlock(&mst->i2c_buffer_lock); + + return ret; +} + +static u16 dibx000_read_word(struct dibx000_i2c_master *mst, u16 reg) +{ + u16 ret; + + if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) { + dprintk("could not acquire lock"); + return 0; + } + + mst->i2c_write_buffer[0] = reg >> 8; + mst->i2c_write_buffer[1] = reg & 0xff; + + memset(mst->msg, 0, 2 * sizeof(struct i2c_msg)); + mst->msg[0].addr = mst->i2c_addr; + mst->msg[0].flags = 0; + mst->msg[0].buf = mst->i2c_write_buffer; + mst->msg[0].len = 2; + mst->msg[1].addr = mst->i2c_addr; + mst->msg[1].flags = I2C_M_RD; + mst->msg[1].buf = mst->i2c_read_buffer; + mst->msg[1].len = 2; + + if (i2c_transfer(mst->i2c_adap, mst->msg, 2) != 2) + dprintk("i2c read error on %d", reg); + + ret = (mst->i2c_read_buffer[0] << 8) | mst->i2c_read_buffer[1]; + mutex_unlock(&mst->i2c_buffer_lock); + + return ret; +} + +static int dibx000_is_i2c_done(struct dibx000_i2c_master *mst) +{ + int i = 100; + 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); + + 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) | + (1 << 8) | + (1 << 7) | + (0 << 6) | + (0 << 5) | + ((len & 0x7) << 2) | + (0 << 1) | + (0 << 0); + + 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) | + (1 << 8) | + (1 << 7) | + (0 << 6) | + (0 << 5) | + ((len & 0x7) << 2) | + (1 << 1) | + (0 << 0); + + 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) +{ + if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) { + dprintk("selecting interface: %d", intf); + mst->selected_interface = intf; + return dibx000_write_word(mst, mst->base_reg + 4, intf); + } + 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) +{ + 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 int dibx000_i2c_gated_gpio67_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg msg[], int num) +{ + struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap); + int ret; + + if (num > 32) { + dprintk("%s: too much I2C message to be transmitted (%i).\ + Maximum is 32", __func__, num); + return -ENOMEM; + } + + dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_GPIO_6_7); + + if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) { + dprintk("could not acquire lock"); + return -EINVAL; + } + + memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num)); + + /* open the gate */ + dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1); + mst->msg[0].addr = mst->i2c_addr; + mst->msg[0].buf = &mst->i2c_write_buffer[0]; + mst->msg[0].len = 4; + + memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num); + + /* close the gate */ + dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0); + mst->msg[num + 1].addr = mst->i2c_addr; + mst->msg[num + 1].buf = &mst->i2c_write_buffer[4]; + mst->msg[num + 1].len = 4; + + ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? + num : -EIO); + + mutex_unlock(&mst->i2c_buffer_lock); + return ret; +} + +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) +{ + struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap); + int ret; + + if (num > 32) { + dprintk("%s: too much I2C message to be transmitted (%i).\ + Maximum is 32", __func__, num); + return -ENOMEM; + } + + dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER); + + if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) { + dprintk("could not acquire lock"); + return -EINVAL; + } + memset(mst->msg, 0, sizeof(struct i2c_msg) * (2 + num)); + + /* open the gate */ + dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[0], msg[0].addr, 1); + mst->msg[0].addr = mst->i2c_addr; + mst->msg[0].buf = &mst->i2c_write_buffer[0]; + mst->msg[0].len = 4; + + memcpy(&mst->msg[1], msg, sizeof(struct i2c_msg) * num); + + /* close the gate */ + dibx000_i2c_gate_ctrl(mst, &mst->i2c_write_buffer[4], 0, 0); + mst->msg[num + 1].addr = mst->i2c_addr; + mst->msg[num + 1].buf = &mst->i2c_write_buffer[4]; + mst->msg[num + 1].len = 4; + + ret = (i2c_transfer(mst->i2c_adap, mst->msg, 2 + num) == 2 + num ? + num : -EIO); + mutex_unlock(&mst->i2c_buffer_lock); + return ret; +} + +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; + 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; + } + + return i2c; +} + +EXPORT_SYMBOL(dibx000_get_i2c_adapter); + +void dibx000_reset_i2c_master(struct dibx000_i2c_master *mst) +{ + /* initialize the i2c-master by closing the gate */ + u8 tx[4]; + struct i2c_msg m = {.addr = mst->i2c_addr,.buf = tx,.len = 4 }; + + dibx000_i2c_gate_ctrl(mst, tx, 0, 0); + i2c_transfer(mst->i2c_adap, &m, 1); + mst->selected_interface = 0xff; // the first time force a select of the I2C + dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER); +} + +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) +{ + strncpy(i2c_adap->name, name, sizeof(i2c_adap->name)); + 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) +{ + int ret; + + mutex_init(&mst->i2c_buffer_lock); + if (mutex_lock_interruptible(&mst->i2c_buffer_lock) < 0) { + dprintk("could not acquire lock"); + return -EINVAL; + } + memset(mst->msg, 0, sizeof(struct i2c_msg)); + mst->msg[0].addr = i2c_addr >> 1; + mst->msg[0].flags = 0; + mst->msg[0].buf = mst->i2c_write_buffer; + mst->msg[0].len = 4; + + mst->device_rev = device_rev; + mst->i2c_adap = i2c_adap; + mst->i2c_addr = i2c_addr >> 1; + + if (device_rev == DIB7000P || device_rev == DIB8000) + mst->base_reg = 1024; + 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->master_i2c_adap_gpio67, &dibx000_i2c_gated_gpio67_algo, + "DiBX000 master GPIO67 I2C bus", mst) != 0) + printk(KERN_ERR + "DiBX000: could not initialize the master i2c_adapter\n"); + + /* initialize the i2c-master by closing the gate */ + dibx000_i2c_gate_ctrl(mst, mst->i2c_write_buffer, 0, 0); + + ret = (i2c_transfer(i2c_adap, mst->msg, 1) == 1); + mutex_unlock(&mst->i2c_buffer_lock); + + return ret; +} + +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; + + t = current_kernel_time(); + return (t.tv_sec * 10000) + (t.tv_nsec / 100000); +} +EXPORT_SYMBOL(systime); + +MODULE_AUTHOR("Patrick Boettcher <pboettcher@dibcom.fr>"); +MODULE_DESCRIPTION("Common function the DiBcom demodulator family"); +MODULE_LICENSE("GPL"); |
