1 files changed, 514 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 00000000000..774d507b66c
--- /dev/null
+++ b/drivers/media/dvb/frontends/dibx000_common.c
@@ -0,0 +1,514 @@
+#include <linux/i2c.h>
+#include <linux/mutex.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");