[PATCH 2/3] ARM: AT91: IIO: Add AT91 ADC driver.

Jean-Christophe PLAGNIOL-VILLARD
2011-10-23T09:08:13Z

On 18:18 Wed 19 Oct , Maxime Ripard wrote:
> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
> Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
please keep me in CC
> +
> +static int at91adc_channel_init(struct at91adc_state *st)
> +{
> + int ret = 0, i;
> + st->channels = kzalloc(sizeof(struct iio_chan_spec) * st->nb_chan,
> + GFP_KERNEL);
> + if (st->channels == NULL)
> + return -ENOMEM;
> +
> + for (i = 0; i < st->nb_chan; i++) {
> + struct iio_chan_spec *chan = st->channels + i;
> + chan->type = IIO_VOLTAGE;
> + chan->indexed = 1;
> + chan->channel = i;
> + ++ret;
> + }
> +
> + return ret;
> +}
> +
> +static int at91adc_read_raw(struct iio_dev *idev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct at91adc_state *st = iio_priv(idev);
> +
> + switch (mask) {
> + case 0:
> + mutex_lock(&st->lock);
> +
> + at91adc_reg_write(st->reg_base, AT91_ADC_CHER,
> + AT91_ADC_CH(chan->channel));
> + at91adc_reg_write(st->reg_base, AT91_ADC_IER,
> + AT91_ADC_EOC(chan->channel));
> + at91adc_reg_write(st->reg_base, AT91_ADC_CR, AT91_ADC_START);
> +
> + wait_event_interruptible(st->wq_data_avail, st->done);
> + *val = st->lcdr;
> +
> + at91adc_reg_write(st->reg_base, AT91_ADC_CHDR,
> + AT91_ADC_CH(chan->channel));
> + at91adc_reg_write(st->reg_base, AT91_ADC_IDR,
> + AT91_ADC_EOC(chan->channel));
> +
> + st->lcdr = 0;
> + st->done = false;
> + mutex_unlock(&st->lock);
> + return IIO_VAL_INT;
> + default:
> + break;
> + }
> + return -EINVAL;
> +}
> +
> +static const struct iio_info at91adc_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &at91adc_read_raw,
> +};
> +
> +static int __devinit at91adc_probe(struct platform_device *pdev)
> +{
> + unsigned int prsc, mstrclk, ticks;
> + int ret;
> + struct iio_dev *idev;
> + struct at91adc_state *st;
> + struct resource *res;
> + struct at91_adc_data *pdata = pdev->dev.platform_data;
do not refence it copy need for the DT
> +
> + dev_dbg(&pdev->dev, "AT91ADC probed\n");
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "No resource defined\n");
> + ret = -ENXIO;
> + goto error_ret;
> + }
> +
> + idev = iio_allocate_device(sizeof(*st));
> + if (idev == NULL) {
> + dev_err(&pdev->dev, "Failed to allocate memory.\n");
> + ret = -ENOMEM;
> + goto error_ret;
> + }
> + platform_set_drvdata(pdev, idev);
> +
> + idev->dev.parent = &pdev->dev;
> + idev->name = platform_get_device_id(pdev)->name;
> + idev->modes = INDIO_DIRECT_MODE;
> + idev->info = &at91adc_info;
> +
> + st = iio_priv(idev);
> + st->irq = platform_get_irq(pdev, 0);
> + if (st->irq < 0) {
> + dev_err(&pdev->dev, "No IRQ ID is designated\n");
> + ret = -ENODEV;
> + goto error_free_device;
> + }
> +
> + if (!request_mem_region(res->start, resource_size(res),
> + "AT91 adc registers")) {
> + dev_err(&pdev->dev, "Resources are unavailable.\n");
> + ret = -EBUSY;
> + goto error_free_device;
> + }
> +
> + st->reg_base = ioremap(res->start, resource_size(res));
> + if (!st->reg_base) {
> + dev_err(&pdev->dev, "Failed to map registers.\n");
> + ret = -ENOMEM;
> + goto error_release_mem;
> + }
> +
> + /*
> + * Disable all IRQs before setting up the handler
> + */
> + at91adc_reg_write(st->reg_base, AT91_ADC_CR, AT91_ADC_SWRST);
> + at91adc_reg_write(st->reg_base, AT91_ADC_IDR, 0xFFFFFFFF);
> + ret = request_irq(st->irq,
> + at91adc_eoc_trigger, 0, pdev->dev.driver->name, st);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
> + goto error_unmap_reg;
> + }
> +
> + st->clk = clk_get(&pdev->dev, "adc_clk");
> + if (IS_ERR(st->clk)) {
> + dev_err(&pdev->dev, "Failed to get the clock.\n");
> + ret = PTR_ERR(st->clk);
> + goto error_free_irq;
> + }
> +
> + clk_enable(st->clk);
> + mstrclk = clk_get_rate(st->clk);
> +
> + if (!pdata) {
> + dev_err(&pdev->dev, "No platform data available.\n");
> + ret = -EINVAL;
> + goto error_free_clk;
> + }
> +
> + if (!pdata->adc_clock) {
> + dev_err(&pdev->dev, "No ADCClock available.\n");
> + ret = -EINVAL;
> + goto error_free_clk;
> + }
where is the platform data struct?

Best Regards,
J.