ix2505v.c

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#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <linux/slab.h>
#include <linux/types.h>

#include "ix2505v.h"

static int ix2505v_debug;
#define dprintk(level, args...) do { \
    if (ix2505v_debug & level) \
        printk(KERN_DEBUG "ix2505v: " args); \
} while (0)

#define deb_info(args...)  dprintk(0x01, args)
#define deb_i2c(args...)  dprintk(0x02, args)

struct ix2505v_state {
    struct i2c_adapter *i2c;
    const struct ix2505v_config *config;
    u32 frequency;
};

static int ix2505v_read_status_reg(struct ix2505v_state *state)
{
    u8 addr = state->config->tuner_address;
    u8 b2[] = {0};
    int ret;

    struct i2c_msg msg[1] = {
        { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 }
    };

    ret = i2c_transfer(state->i2c, msg, 1);
    deb_i2c("Read %s ", __func__);

    return (ret == 1) ? (int) b2[0] : -1;
}

static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count)
{
    struct i2c_msg msg[1] = {
        { .addr = state->config->tuner_address, .flags = 0,
          .buf = buf, .len = count },
    };

    int ret;

    ret = i2c_transfer(state->i2c, msg, 1);

    if (ret != 1) {
        deb_i2c("%s: i2c error, ret=%d\n", __func__, ret);
        return -EIO;
    }

    return 0;
}

static int ix2505v_release(struct dvb_frontend *fe)
{
    struct ix2505v_state *state = fe->tuner_priv;

    fe->tuner_priv = NULL;
    kfree(state);

    return 0;
}

static int ix2505v_set_params(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    struct ix2505v_state *state = fe->tuner_priv;
    u32 frequency = c->frequency;
    u32 b_w  = (c->symbol_rate * 27) / 32000;
    u32 div_factor, N , A, x;
    int ret = 0, len;
    u8 gain, cc, ref, psc, local_osc, lpf;
    u8 data[4] = {0};

    if ((frequency < fe->ops.info.frequency_min)
    ||  (frequency > fe->ops.info.frequency_max))
        return -EINVAL;

    if (state->config->tuner_gain)
        gain = (state->config->tuner_gain < 4)
            ? state->config->tuner_gain : 0;
    else
        gain = 0x0;

    if (state->config->tuner_chargepump)
        cc = state->config->tuner_chargepump;
    else
        cc = 0x3;

    ref = 8; /* REF =1 */
    psc = 32; /* PSC = 0 */

    div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */
    x = div_factor / psc;
    N = x/100;
    A = ((x - (N * 100)) * psc) / 100;

    data[0] = ((gain & 0x3) << 5) | (N >> 3);
    data[1] = (N << 5) | (A & 0x1f);
    data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/

    deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A);

    if (frequency <= 1065000)
        local_osc = (6 << 5) | 2;
    else if (frequency <= 1170000)
        local_osc = (7 << 5) | 2;
    else if (frequency <= 1300000)
        local_osc = (1 << 5);
    else if (frequency <= 1445000)
        local_osc = (2 << 5);
    else if (frequency <= 1607000)
        local_osc = (3 << 5);
    else if (frequency <= 1778000)
        local_osc = (4 << 5);
    else if (frequency <= 1942000)
        local_osc = (5 << 5);
    else        /*frequency up to 2150000*/
        local_osc = (6 << 5);

    data[3] = local_osc; /* all other bits set 0 */

    if (b_w <= 10000)
        lpf = 0xc;
    else if (b_w <= 12000)
        lpf = 0x2;
    else if (b_w <= 14000)
        lpf = 0xa;
    else if (b_w <= 16000)
        lpf = 0x6;
    else if (b_w <= 18000)
        lpf = 0xe;
    else if (b_w <= 20000)
        lpf = 0x1;
    else if (b_w <= 22000)
        lpf = 0x9;
    else if (b_w <= 24000)
        lpf = 0x5;
    else if (b_w <= 26000)
        lpf = 0xd;
    else if (b_w <= 28000)
        lpf = 0x3;
        else
        lpf = 0xb;

    deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf);
    deb_info("Data 0=[%x%x%x%x]\n", data[0], data[1], data[2], data[3]);

    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 1);

    len = sizeof(data);
    ret |= ix2505v_write(state, data, len);

    data[2] |= 0x4; /* set TM = 1 other bits same */

    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 1);

    len = 1;
    ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */

    msleep(10);

    data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */
    data[3] |= (lpf & 0x3) << 2;

    deb_info("Data 2=[%x%x]\n", data[2], data[3]);

    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 1);

    len = 2;
    ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */

    if (state->config->min_delay_ms)
        msleep(state->config->min_delay_ms);

    state->frequency = frequency;

    return ret;
}

static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
    struct ix2505v_state *state = fe->tuner_priv;

    *frequency = state->frequency;

    return 0;
}

static struct dvb_tuner_ops ix2505v_tuner_ops = {
    .info = {
        .name = "Sharp IX2505V (B0017)",
        .frequency_min = 950000,
        .frequency_max = 2175000
    },
    .release = ix2505v_release,
    .set_params = ix2505v_set_params,
    .get_frequency = ix2505v_get_frequency,
};

struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,
                    const struct ix2505v_config *config,
                    struct i2c_adapter *i2c)
{
    struct ix2505v_state *state = NULL;
    int ret;

    if (NULL == config) {
        deb_i2c("%s: no config ", __func__);
        goto error;
    }

    state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL);
    if (NULL == state)
        return NULL;

    state->config = config;
    state->i2c = i2c;

    if (state->config->tuner_write_only) {
        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 1);

        ret = ix2505v_read_status_reg(state);

        if (ret & 0x80) {
            deb_i2c("%s: No IX2505V found\n", __func__);
            goto error;
        }

        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 0);
    }

    fe->tuner_priv = state;

    memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops,
        sizeof(struct dvb_tuner_ops));
    deb_i2c("%s: initialization (%s addr=0x%02x) ok\n",
        __func__, fe->ops.tuner_ops.info.name, config->tuner_address);

    return fe;

error:
    kfree(state);
    return NULL;
}
EXPORT_SYMBOL(ix2505v_attach);

module_param_named(debug, ix2505v_debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("DVB IX2505V tuner driver");
MODULE_AUTHOR("Malcolm Priestley");
MODULE_LICENSE("GPL");