cimax2.c

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/*
 * cimax2.c
 *
 * CIMax2(R) SP2 driver in conjunction with NetUp Dual DVB-S2 CI card
 *
 * Copyright (C) 2009 NetUP Inc.
 * Copyright (C) 2009 Igor M. Liplianin <[email protected]>
 * Copyright (C) 2009 Abylay Ospan <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "cx23885.h"
#include "dvb_ca_en50221.h"
/**** Bit definitions for MC417_RWD and MC417_OEN registers  ***
  bits 31-16
+-----------+
| Reserved  |
+-----------+
  bit 15  bit 14  bit 13 bit 12  bit 11  bit 10  bit 9   bit 8
+-------+-------+-------+-------+-------+-------+-------+-------+
|  WR#  |  RD#  |       |  ACK# |  ADHI |  ADLO |  CS1# |  CS0# |
+-------+-------+-------+-------+-------+-------+-------+-------+
 bit 7   bit 6   bit 5   bit 4   bit 3   bit 2   bit 1   bit 0
+-------+-------+-------+-------+-------+-------+-------+-------+
|  DATA7|  DATA6|  DATA5|  DATA4|  DATA3|  DATA2|  DATA1|  DATA0|
+-------+-------+-------+-------+-------+-------+-------+-------+
***/
/* MC417 */
#define NETUP_DATA      0x000000ff
#define NETUP_WR        0x00008000
#define NETUP_RD        0x00004000
#define NETUP_ACK       0x00001000
#define NETUP_ADHI      0x00000800
#define NETUP_ADLO      0x00000400
#define NETUP_CS1       0x00000200
#define NETUP_CS0       0x00000100
#define NETUP_EN_ALL        0x00001000
#define NETUP_CTRL_OFF      (NETUP_CS1 | NETUP_CS0 | NETUP_WR | NETUP_RD)
#define NETUP_CI_CTL        0x04
#define NETUP_CI_RD     1

#define NETUP_IRQ_DETAM     0x1
#define NETUP_IRQ_IRQAM     0x4

static unsigned int ci_dbg;
module_param(ci_dbg, int, 0644);
MODULE_PARM_DESC(ci_dbg, "Enable CI debugging");

static unsigned int ci_irq_enable;
module_param(ci_irq_enable, int, 0644);
MODULE_PARM_DESC(ci_irq_enable, "Enable IRQ from CAM");

#define ci_dbg_print(args...) \
    do { \
        if (ci_dbg) \
            printk(KERN_DEBUG args); \
    } while (0)

#define ci_irq_flags() (ci_irq_enable ? NETUP_IRQ_IRQAM : 0)

/* stores all private variables for communication with CI */
struct netup_ci_state {
    struct dvb_ca_en50221 ca;
    struct mutex ca_mutex;
    struct i2c_adapter *i2c_adap;
    u8 ci_i2c_addr;
    int status;
    struct work_struct work;
    void *priv;
    u8 current_irq_mode;
    int current_ci_flag;
    unsigned long next_status_checked_time;
};


int netup_read_i2c(struct i2c_adapter *i2c_adap, u8 addr, u8 reg,
                        u8 *buf, int len)
{
    int ret;
    struct i2c_msg msg[] = {
        {
            .addr   = addr,
            .flags  = 0,
            .buf    = &reg,
            .len    = 1
        }, {
            .addr   = addr,
            .flags  = I2C_M_RD,
            .buf    = buf,
            .len    = len
        }
    };

    ret = i2c_transfer(i2c_adap, msg, 2);

    if (ret != 2) {
        ci_dbg_print("%s: i2c read error, Reg = 0x%02x, Status = %d\n",
                        __func__, reg, ret);

        return -1;
    }

    ci_dbg_print("%s: i2c read Addr=0x%04x, Reg = 0x%02x, data = %02x\n",
                        __func__, addr, reg, buf[0]);

    return 0;
}

int netup_write_i2c(struct i2c_adapter *i2c_adap, u8 addr, u8 reg,
                        u8 *buf, int len)
{
    int ret;
    u8 buffer[len + 1];

    struct i2c_msg msg = {
        .addr   = addr,
        .flags  = 0,
        .buf    = &buffer[0],
        .len    = len + 1
    };

    buffer[0] = reg;
    memcpy(&buffer[1], buf, len);

    ret = i2c_transfer(i2c_adap, &msg, 1);

    if (ret != 1) {
        ci_dbg_print("%s: i2c write error, Reg=[0x%02x], Status=%d\n",
                        __func__, reg, ret);
        return -1;
    }

    return 0;
}

int netup_ci_get_mem(struct cx23885_dev *dev)
{
    int mem;
    unsigned long timeout = jiffies + msecs_to_jiffies(1);

    for (;;) {
        mem = cx_read(MC417_RWD);
        if ((mem & NETUP_ACK) == 0)
            break;
        if (time_after(jiffies, timeout))
            break;
        udelay(1);
    }

    cx_set(MC417_RWD, NETUP_CTRL_OFF);

    return mem & 0xff;
}

int netup_ci_op_cam(struct dvb_ca_en50221 *en50221, int slot,
                u8 flag, u8 read, int addr, u8 data)
{
    struct netup_ci_state *state = en50221->data;
    struct cx23885_tsport *port = state->priv;
    struct cx23885_dev *dev = port->dev;

    u8 store;
    int mem;
    int ret;

    if (0 != slot)
        return -EINVAL;

    if (state->current_ci_flag != flag) {
        ret = netup_read_i2c(state->i2c_adap, state->ci_i2c_addr,
                0, &store, 1);
        if (ret != 0)
            return ret;

        store &= ~0x0c;
        store |= flag;

        ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                0, &store, 1);
        if (ret != 0)
            return ret;
    }
    state->current_ci_flag = flag;

    mutex_lock(&dev->gpio_lock);

    /* write addr */
    cx_write(MC417_OEN, NETUP_EN_ALL);
    cx_write(MC417_RWD, NETUP_CTRL_OFF |
                NETUP_ADLO | (0xff & addr));
    cx_clear(MC417_RWD, NETUP_ADLO);
    cx_write(MC417_RWD, NETUP_CTRL_OFF |
                NETUP_ADHI | (0xff & (addr >> 8)));
    cx_clear(MC417_RWD, NETUP_ADHI);

    if (read) { /* data in */
        cx_write(MC417_OEN, NETUP_EN_ALL | NETUP_DATA);
    } else /* data out */
        cx_write(MC417_RWD, NETUP_CTRL_OFF | data);

    /* choose chip */
    cx_clear(MC417_RWD,
            (state->ci_i2c_addr == 0x40) ? NETUP_CS0 : NETUP_CS1);
    /* read/write */
    cx_clear(MC417_RWD, (read) ? NETUP_RD : NETUP_WR);
    mem = netup_ci_get_mem(dev);

    mutex_unlock(&dev->gpio_lock);

    if (!read)
        if (mem < 0)
            return -EREMOTEIO;

    ci_dbg_print("%s: %s: chipaddr=[0x%x] addr=[0x%02x], %s=%x\n", __func__,
            (read) ? "read" : "write", state->ci_i2c_addr, addr,
            (flag == NETUP_CI_CTL) ? "ctl" : "mem",
            (read) ? mem : data);

    if (read)
        return mem;

    return 0;
}

int netup_ci_read_attribute_mem(struct dvb_ca_en50221 *en50221,
                        int slot, int addr)
{
    return netup_ci_op_cam(en50221, slot, 0, NETUP_CI_RD, addr, 0);
}

int netup_ci_write_attribute_mem(struct dvb_ca_en50221 *en50221,
                        int slot, int addr, u8 data)
{
    return netup_ci_op_cam(en50221, slot, 0, 0, addr, data);
}

int netup_ci_read_cam_ctl(struct dvb_ca_en50221 *en50221, int slot, u8 addr)
{
    return netup_ci_op_cam(en50221, slot, NETUP_CI_CTL,
                            NETUP_CI_RD, addr, 0);
}

int netup_ci_write_cam_ctl(struct dvb_ca_en50221 *en50221, int slot,
                            u8 addr, u8 data)
{
    return netup_ci_op_cam(en50221, slot, NETUP_CI_CTL, 0, addr, data);
}

int netup_ci_slot_reset(struct dvb_ca_en50221 *en50221, int slot)
{
    struct netup_ci_state *state = en50221->data;
    u8 buf =  0x80;
    int ret;

    if (0 != slot)
        return -EINVAL;

    udelay(500);
    ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                            0, &buf, 1);

    if (ret != 0)
        return ret;

    udelay(500);

    buf = 0x00;
    ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                            0, &buf, 1);

    msleep(1000);
    dvb_ca_en50221_camready_irq(&state->ca, 0);

    return 0;

}

int netup_ci_slot_shutdown(struct dvb_ca_en50221 *en50221, int slot)
{
    /* not implemented */
    return 0;
}

int netup_ci_set_irq(struct dvb_ca_en50221 *en50221, u8 irq_mode)
{
    struct netup_ci_state *state = en50221->data;
    int ret;

    if (irq_mode == state->current_irq_mode)
        return 0;

    ci_dbg_print("%s: chipaddr=[0x%x] setting ci IRQ to [0x%x] \n",
            __func__, state->ci_i2c_addr, irq_mode);
    ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                            0x1b, &irq_mode, 1);

    if (ret != 0)
        return ret;

    state->current_irq_mode = irq_mode;

    return 0;
}

int netup_ci_slot_ts_ctl(struct dvb_ca_en50221 *en50221, int slot)
{
    struct netup_ci_state *state = en50221->data;
    u8 buf;

    if (0 != slot)
        return -EINVAL;

    netup_read_i2c(state->i2c_adap, state->ci_i2c_addr,
            0, &buf, 1);
    buf |= 0x60;

    return netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                            0, &buf, 1);
}

/* work handler */
static void netup_read_ci_status(struct work_struct *work)
{
    struct netup_ci_state *state =
            container_of(work, struct netup_ci_state, work);
    u8 buf[33];
    int ret;

    /* CAM module IRQ processing. fast operation */
    dvb_ca_en50221_frda_irq(&state->ca, 0);

    /* CAM module INSERT/REMOVE processing. slow operation because of i2c
     * transfers */
    if (time_after(jiffies, state->next_status_checked_time)
            || !state->status) {
        ret = netup_read_i2c(state->i2c_adap, state->ci_i2c_addr,
                0, &buf[0], 33);

        state->next_status_checked_time = jiffies
            + msecs_to_jiffies(1000);

        if (ret != 0)
            return;

        ci_dbg_print("%s: Slot Status Addr=[0x%04x], "
                "Reg=[0x%02x], data=%02x, "
                "TS config = %02x\n", __func__,
                state->ci_i2c_addr, 0, buf[0],
                buf[0]);


        if (buf[0] & 1)
            state->status = DVB_CA_EN50221_POLL_CAM_PRESENT |
                DVB_CA_EN50221_POLL_CAM_READY;
        else
            state->status = 0;
    }
}

/* CI irq handler */
int netup_ci_slot_status(struct cx23885_dev *dev, u32 pci_status)
{
    struct cx23885_tsport *port = NULL;
    struct netup_ci_state *state = NULL;

    ci_dbg_print("%s:\n", __func__);

    if (0 == (pci_status & (PCI_MSK_GPIO0 | PCI_MSK_GPIO1)))
        return 0;

    if (pci_status & PCI_MSK_GPIO0) {
        port = &dev->ts1;
        state = port->port_priv;
        schedule_work(&state->work);
        ci_dbg_print("%s: Wakeup CI0\n", __func__);
    }

    if (pci_status & PCI_MSK_GPIO1) {
        port = &dev->ts2;
        state = port->port_priv;
        schedule_work(&state->work);
        ci_dbg_print("%s: Wakeup CI1\n", __func__);
    }

    return 1;
}

int netup_poll_ci_slot_status(struct dvb_ca_en50221 *en50221, int slot, int open)
{
    struct netup_ci_state *state = en50221->data;

    if (0 != slot)
        return -EINVAL;

    netup_ci_set_irq(en50221, open ? (NETUP_IRQ_DETAM | ci_irq_flags())
            : NETUP_IRQ_DETAM);

    return state->status;
}

int netup_ci_init(struct cx23885_tsport *port)
{
    struct netup_ci_state *state;
    u8 cimax_init[34] = {
        0x00, /* module A control*/
        0x00, /* auto select mask high A */
        0x00, /* auto select mask low A */
        0x00, /* auto select pattern high A */
        0x00, /* auto select pattern low A */
        0x44, /* memory access time A */
        0x00, /* invert input A */
        0x00, /* RFU */
        0x00, /* RFU */
        0x00, /* module B control*/
        0x00, /* auto select mask high B */
        0x00, /* auto select mask low B */
        0x00, /* auto select pattern high B */
        0x00, /* auto select pattern low B */
        0x44, /* memory access time B */
        0x00, /* invert input B */
        0x00, /* RFU */
        0x00, /* RFU */
        0x00, /* auto select mask high Ext */
        0x00, /* auto select mask low Ext */
        0x00, /* auto select pattern high Ext */
        0x00, /* auto select pattern low Ext */
        0x00, /* RFU */
        0x02, /* destination - module A */
        0x01, /* power on (use it like store place) */
        0x00, /* RFU */
        0x00, /* int status read only */
        ci_irq_flags() | NETUP_IRQ_DETAM, /* DETAM, IRQAM unmasked */
        0x05, /* EXTINT=active-high, INT=push-pull */
        0x00, /* USCG1 */
        0x04, /* ack active low */
        0x00, /* LOCK = 0 */
        0x33, /* serial mode, rising in, rising out, MSB first*/
        0x31, /* synchronization */
    };
    int ret;

    ci_dbg_print("%s\n", __func__);
    state = kzalloc(sizeof(struct netup_ci_state), GFP_KERNEL);
    if (!state) {
        ci_dbg_print("%s: Unable create CI structure!\n", __func__);
        ret = -ENOMEM;
        goto err;
    }

    port->port_priv = state;

    switch (port->nr) {
    case 1:
        state->ci_i2c_addr = 0x40;
        break;
    case 2:
        state->ci_i2c_addr = 0x41;
        break;
    }

    state->i2c_adap = &port->dev->i2c_bus[0].i2c_adap;
    state->ca.owner = THIS_MODULE;
    state->ca.read_attribute_mem = netup_ci_read_attribute_mem;
    state->ca.write_attribute_mem = netup_ci_write_attribute_mem;
    state->ca.read_cam_control = netup_ci_read_cam_ctl;
    state->ca.write_cam_control = netup_ci_write_cam_ctl;
    state->ca.slot_reset = netup_ci_slot_reset;
    state->ca.slot_shutdown = netup_ci_slot_shutdown;
    state->ca.slot_ts_enable = netup_ci_slot_ts_ctl;
    state->ca.poll_slot_status = netup_poll_ci_slot_status;
    state->ca.data = state;
    state->priv = port;
    state->current_irq_mode = ci_irq_flags() | NETUP_IRQ_DETAM;

    ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                        0, &cimax_init[0], 34);
    /* lock registers */
    ret |= netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                        0x1f, &cimax_init[0x18], 1);
    /* power on slots */
    ret |= netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                        0x18, &cimax_init[0x18], 1);

    if (0 != ret)
        goto err;

    ret = dvb_ca_en50221_init(&port->frontends.adapter,
                   &state->ca,
                   /* flags */ 0,
                   /* n_slots */ 1);
    if (0 != ret)
        goto err;

    INIT_WORK(&state->work, netup_read_ci_status);
    schedule_work(&state->work);

    ci_dbg_print("%s: CI initialized!\n", __func__);

    return 0;
err:
    ci_dbg_print("%s: Cannot initialize CI: Error %d.\n", __func__, ret);
    kfree(state);
    return ret;
}

void netup_ci_exit(struct cx23885_tsport *port)
{
    struct netup_ci_state *state;

    if (NULL == port)
        return;

    state = (struct netup_ci_state *)port->port_priv;
    if (NULL == state)
        return;

    if (NULL == state->ca.data)
        return;

    dvb_ca_en50221_release(&state->ca);
    kfree(state);
}