ctamixer.c

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#include "ctamixer.h"
#include "cthardware.h"
#include <linux/slab.h>

#define AMIXER_RESOURCE_NUM 256
#define SUM_RESOURCE_NUM    256

#define AMIXER_Y_IMMEDIATE  1

#define BLANK_SLOT      4094

static int amixer_master(struct rsc *rsc)
{
    rsc->conj = 0;
    return rsc->idx = container_of(rsc, struct amixer, rsc)->idx[0];
}

static int amixer_next_conj(struct rsc *rsc)
{
    rsc->conj++;
    return container_of(rsc, struct amixer, rsc)->idx[rsc->conj];
}

static int amixer_index(const struct rsc *rsc)
{
    return container_of(rsc, struct amixer, rsc)->idx[rsc->conj];
}

static int amixer_output_slot(const struct rsc *rsc)
{
    return (amixer_index(rsc) << 4) + 0x4;
}

static struct rsc_ops amixer_basic_rsc_ops = {
    .master     = amixer_master,
    .next_conj  = amixer_next_conj,
    .index      = amixer_index,
    .output_slot    = amixer_output_slot,
};

static int amixer_set_input(struct amixer *amixer, struct rsc *rsc)
{
    struct hw *hw;

    hw = amixer->rsc.hw;
    hw->amixer_set_mode(amixer->rsc.ctrl_blk, AMIXER_Y_IMMEDIATE);
    amixer->input = rsc;
    if (!rsc)
        hw->amixer_set_x(amixer->rsc.ctrl_blk, BLANK_SLOT);
    else
        hw->amixer_set_x(amixer->rsc.ctrl_blk,
                    rsc->ops->output_slot(rsc));

    return 0;
}

/* y is a 14-bit immediate constant */
static int amixer_set_y(struct amixer *amixer, unsigned int y)
{
    struct hw *hw;

    hw = amixer->rsc.hw;
    hw->amixer_set_y(amixer->rsc.ctrl_blk, y);

    return 0;
}

static int amixer_set_invalid_squash(struct amixer *amixer, unsigned int iv)
{
    struct hw *hw;

    hw = amixer->rsc.hw;
    hw->amixer_set_iv(amixer->rsc.ctrl_blk, iv);

    return 0;
}

static int amixer_set_sum(struct amixer *amixer, struct sum *sum)
{
    struct hw *hw;

    hw = amixer->rsc.hw;
    amixer->sum = sum;
    if (!sum) {
        hw->amixer_set_se(amixer->rsc.ctrl_blk, 0);
    } else {
        hw->amixer_set_se(amixer->rsc.ctrl_blk, 1);
        hw->amixer_set_sadr(amixer->rsc.ctrl_blk,
                    sum->rsc.ops->index(&sum->rsc));
    }

    return 0;
}

static int amixer_commit_write(struct amixer *amixer)
{
    struct hw *hw;
    unsigned int index;
    int i;
    struct rsc *input;
    struct sum *sum;

    hw = amixer->rsc.hw;
    input = amixer->input;
    sum = amixer->sum;

    /* Program master and conjugate resources */
    amixer->rsc.ops->master(&amixer->rsc);
    if (input)
        input->ops->master(input);

    if (sum)
        sum->rsc.ops->master(&sum->rsc);

    for (i = 0; i < amixer->rsc.msr; i++) {
        hw->amixer_set_dirty_all(amixer->rsc.ctrl_blk);
        if (input) {
            hw->amixer_set_x(amixer->rsc.ctrl_blk,
                        input->ops->output_slot(input));
            input->ops->next_conj(input);
        }
        if (sum) {
            hw->amixer_set_sadr(amixer->rsc.ctrl_blk,
                        sum->rsc.ops->index(&sum->rsc));
            sum->rsc.ops->next_conj(&sum->rsc);
        }
        index = amixer->rsc.ops->output_slot(&amixer->rsc);
        hw->amixer_commit_write(hw, index, amixer->rsc.ctrl_blk);
        amixer->rsc.ops->next_conj(&amixer->rsc);
    }
    amixer->rsc.ops->master(&amixer->rsc);
    if (input)
        input->ops->master(input);

    if (sum)
        sum->rsc.ops->master(&sum->rsc);

    return 0;
}

static int amixer_commit_raw_write(struct amixer *amixer)
{
    struct hw *hw;
    unsigned int index;

    hw = amixer->rsc.hw;
    index = amixer->rsc.ops->output_slot(&amixer->rsc);
    hw->amixer_commit_write(hw, index, amixer->rsc.ctrl_blk);

    return 0;
}

static int amixer_get_y(struct amixer *amixer)
{
    struct hw *hw;

    hw = amixer->rsc.hw;
    return hw->amixer_get_y(amixer->rsc.ctrl_blk);
}

static int amixer_setup(struct amixer *amixer, struct rsc *input,
            unsigned int scale, struct sum *sum)
{
    amixer_set_input(amixer, input);
    amixer_set_y(amixer, scale);
    amixer_set_sum(amixer, sum);
    amixer_commit_write(amixer);
    return 0;
}

static struct amixer_rsc_ops amixer_ops = {
    .set_input      = amixer_set_input,
    .set_invalid_squash = amixer_set_invalid_squash,
    .set_scale      = amixer_set_y,
    .set_sum        = amixer_set_sum,
    .commit_write       = amixer_commit_write,
    .commit_raw_write   = amixer_commit_raw_write,
    .setup          = amixer_setup,
    .get_scale      = amixer_get_y,
};

static int amixer_rsc_init(struct amixer *amixer,
               const struct amixer_desc *desc,
               struct amixer_mgr *mgr)
{
    int err;

    err = rsc_init(&amixer->rsc, amixer->idx[0],
            AMIXER, desc->msr, mgr->mgr.hw);
    if (err)
        return err;

    /* Set amixer specific operations */
    amixer->rsc.ops = &amixer_basic_rsc_ops;
    amixer->ops = &amixer_ops;
    amixer->input = NULL;
    amixer->sum = NULL;

    amixer_setup(amixer, NULL, 0, NULL);

    return 0;
}

static int amixer_rsc_uninit(struct amixer *amixer)
{
    amixer_setup(amixer, NULL, 0, NULL);
    rsc_uninit(&amixer->rsc);
    amixer->ops = NULL;
    amixer->input = NULL;
    amixer->sum = NULL;
    return 0;
}

static int get_amixer_rsc(struct amixer_mgr *mgr,
              const struct amixer_desc *desc,
              struct amixer **ramixer)
{
    int err, i;
    unsigned int idx;
    struct amixer *amixer;
    unsigned long flags;

    *ramixer = NULL;

    /* Allocate mem for amixer resource */
    amixer = kzalloc(sizeof(*amixer), GFP_KERNEL);
    if (!amixer)
        return -ENOMEM;

    /* Check whether there are sufficient
     * amixer resources to meet request. */
    err = 0;
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < desc->msr; i++) {
        err = mgr_get_resource(&mgr->mgr, 1, &idx);
        if (err)
            break;

        amixer->idx[i] = idx;
    }
    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    if (err) {
        printk(KERN_ERR "ctxfi: Can't meet AMIXER resource request!\n");
        goto error;
    }

    err = amixer_rsc_init(amixer, desc, mgr);
    if (err)
        goto error;

    *ramixer = amixer;

    return 0;

error:
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i--; i >= 0; i--)
        mgr_put_resource(&mgr->mgr, 1, amixer->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    kfree(amixer);
    return err;
}

static int put_amixer_rsc(struct amixer_mgr *mgr, struct amixer *amixer)
{
    unsigned long flags;
    int i;

    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < amixer->rsc.msr; i++)
        mgr_put_resource(&mgr->mgr, 1, amixer->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    amixer_rsc_uninit(amixer);
    kfree(amixer);

    return 0;
}

int amixer_mgr_create(void *hw, struct amixer_mgr **ramixer_mgr)
{
    int err;
    struct amixer_mgr *amixer_mgr;

    *ramixer_mgr = NULL;
    amixer_mgr = kzalloc(sizeof(*amixer_mgr), GFP_KERNEL);
    if (!amixer_mgr)
        return -ENOMEM;

    err = rsc_mgr_init(&amixer_mgr->mgr, AMIXER, AMIXER_RESOURCE_NUM, hw);
    if (err)
        goto error;

    spin_lock_init(&amixer_mgr->mgr_lock);

    amixer_mgr->get_amixer = get_amixer_rsc;
    amixer_mgr->put_amixer = put_amixer_rsc;

    *ramixer_mgr = amixer_mgr;

    return 0;

error:
    kfree(amixer_mgr);
    return err;
}

int amixer_mgr_destroy(struct amixer_mgr *amixer_mgr)
{
    rsc_mgr_uninit(&amixer_mgr->mgr);
    kfree(amixer_mgr);
    return 0;
}

/* SUM resource management */

static int sum_master(struct rsc *rsc)
{
    rsc->conj = 0;
    return rsc->idx = container_of(rsc, struct sum, rsc)->idx[0];
}

static int sum_next_conj(struct rsc *rsc)
{
    rsc->conj++;
    return container_of(rsc, struct sum, rsc)->idx[rsc->conj];
}

static int sum_index(const struct rsc *rsc)
{
    return container_of(rsc, struct sum, rsc)->idx[rsc->conj];
}

static int sum_output_slot(const struct rsc *rsc)
{
    return (sum_index(rsc) << 4) + 0xc;
}

static struct rsc_ops sum_basic_rsc_ops = {
    .master     = sum_master,
    .next_conj  = sum_next_conj,
    .index      = sum_index,
    .output_slot    = sum_output_slot,
};

static int sum_rsc_init(struct sum *sum,
            const struct sum_desc *desc,
            struct sum_mgr *mgr)
{
    int err;

    err = rsc_init(&sum->rsc, sum->idx[0], SUM, desc->msr, mgr->mgr.hw);
    if (err)
        return err;

    sum->rsc.ops = &sum_basic_rsc_ops;

    return 0;
}

static int sum_rsc_uninit(struct sum *sum)
{
    rsc_uninit(&sum->rsc);
    return 0;
}

static int get_sum_rsc(struct sum_mgr *mgr,
               const struct sum_desc *desc,
               struct sum **rsum)
{
    int err, i;
    unsigned int idx;
    struct sum *sum;
    unsigned long flags;

    *rsum = NULL;

    /* Allocate mem for sum resource */
    sum = kzalloc(sizeof(*sum), GFP_KERNEL);
    if (!sum)
        return -ENOMEM;

    /* Check whether there are sufficient sum resources to meet request. */
    err = 0;
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < desc->msr; i++) {
        err = mgr_get_resource(&mgr->mgr, 1, &idx);
        if (err)
            break;

        sum->idx[i] = idx;
    }
    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    if (err) {
        printk(KERN_ERR "ctxfi: Can't meet SUM resource request!\n");
        goto error;
    }

    err = sum_rsc_init(sum, desc, mgr);
    if (err)
        goto error;

    *rsum = sum;

    return 0;

error:
    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i--; i >= 0; i--)
        mgr_put_resource(&mgr->mgr, 1, sum->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    kfree(sum);
    return err;
}

static int put_sum_rsc(struct sum_mgr *mgr, struct sum *sum)
{
    unsigned long flags;
    int i;

    spin_lock_irqsave(&mgr->mgr_lock, flags);
    for (i = 0; i < sum->rsc.msr; i++)
        mgr_put_resource(&mgr->mgr, 1, sum->idx[i]);

    spin_unlock_irqrestore(&mgr->mgr_lock, flags);
    sum_rsc_uninit(sum);
    kfree(sum);

    return 0;
}

int sum_mgr_create(void *hw, struct sum_mgr **rsum_mgr)
{
    int err;
    struct sum_mgr *sum_mgr;

    *rsum_mgr = NULL;
    sum_mgr = kzalloc(sizeof(*sum_mgr), GFP_KERNEL);
    if (!sum_mgr)
        return -ENOMEM;

    err = rsc_mgr_init(&sum_mgr->mgr, SUM, SUM_RESOURCE_NUM, hw);
    if (err)
        goto error;

    spin_lock_init(&sum_mgr->mgr_lock);

    sum_mgr->get_sum = get_sum_rsc;
    sum_mgr->put_sum = put_sum_rsc;

    *rsum_mgr = sum_mgr;

    return 0;

error:
    kfree(sum_mgr);
    return err;
}

int sum_mgr_destroy(struct sum_mgr *sum_mgr)
{
    rsc_mgr_uninit(&sum_mgr->mgr);
    kfree(sum_mgr);
    return 0;
}