static int device_gpadc_init(struct pm80x_chip *chip,
				       struct pm80x_platform_data *pdata)
{
	struct pm80x_subchip *subchip = chip->subchip;
	struct regmap *map = subchip->regmap_gpadc;
	int data = 0, mask = 0, ret = 0;

	if (!map) {
		dev_warn(chip->dev,
			 "Warning: gpadc regmap is not available!\n");
		return -EINVAL;
	}
	/*
	 * initialize GPADC without activating it turn on GPADC
	 * measurments
	 */
	ret = regmap_update_bits(map,
				 PM800_GPADC_MISC_CONFIG2,
				 PM800_GPADC_MISC_GPFSM_EN,
				 PM800_GPADC_MISC_GPFSM_EN);
	if (ret < 0)
		goto out;
	/*
	 * This function configures the ADC as requires for
	 * CP implementation.CP does not "own" the ADC configuration
	 * registers and relies on AP.
	 * Reason: enable automatic ADC measurements needed
	 * for CP to get VBAT and RF temperature readings.
	 */
	ret = regmap_update_bits(map, PM800_GPADC_MEAS_EN1,
				 PM800_MEAS_EN1_VBAT, PM800_MEAS_EN1_VBAT);
	if (ret < 0)
		goto out;
	ret = regmap_update_bits(map, PM800_GPADC_MEAS_EN2,
				 (PM800_MEAS_EN2_RFTMP | PM800_MEAS_GP0_EN),
				 (PM800_MEAS_EN2_RFTMP | PM800_MEAS_GP0_EN));
	if (ret < 0)
		goto out;

	/*
	 * the defult of PM800 is GPADC operates at 100Ks/s rate
	 * and Number of GPADC slots with active current bias prior
	 * to GPADC sampling = 1 slot for all GPADCs set for
	 * Temprature mesurmants
	 */
	mask = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN1 |
		PM800_GPADC_GP_BIAS_EN2 | PM800_GPADC_GP_BIAS_EN3);

	if (pdata && (pdata->batt_det == 0))
		data = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN1 |
			PM800_GPADC_GP_BIAS_EN2 | PM800_GPADC_GP_BIAS_EN3);
	else
		data = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN2 |
			PM800_GPADC_GP_BIAS_EN3);

	ret = regmap_update_bits(map, PM800_GP_BIAS_ENA1, mask, data);
	if (ret < 0)
		goto out;

	dev_info(chip->dev, "pm800 device_gpadc_init: Done\n");
	return 0;

out:
	dev_info(chip->dev, "pm800 device_gpadc_init: Failed!\n");
	return ret;
}

/*
 * Translate OpenFirmware node properties into platform_data
 */
static int gpio_keys_get_devtree_pdata(struct device *dev,
                                       struct gpio_keys_platform_data *pdata)
{
    struct device_node *node, *pp;
    int i;
    struct gpio_keys_button *buttons;
    u32 reg;

    node = dev->of_node;
    if (node == NULL)
        return -ENODEV;

    memset(pdata, 0, sizeof *pdata);

    pdata->rep = !!of_get_property(node, "autorepeat", NULL);

    /* First count the subnodes */
    pdata->nbuttons = 0;
    pp = NULL;
    while ((pp = of_get_next_child(node, pp)))
        pdata->nbuttons++;

    if (pdata->nbuttons == 0)
        return -ENODEV;

    buttons = kzalloc(pdata->nbuttons * (sizeof *buttons), GFP_KERNEL);
    if (!buttons)
        return -ENOMEM;

    pp = NULL;
    i = 0;
    while ((pp = of_get_next_child(node, pp))) {
        enum of_gpio_flags flags;

        if (!of_find_property(pp, "gpios", NULL)) {
            pdata->nbuttons--;
            dev_warn(dev, "Found button without gpios\n");
            continue;
        }
        buttons[i].gpio = of_get_gpio_flags(pp, 0, &flags);
        buttons[i].active_low = flags & OF_GPIO_ACTIVE_LOW;

        if (of_property_read_u32(pp, "linux,code", &reg)) {
            dev_err(dev, "Button without keycode: 0x%x\n", buttons[i].gpio);
            goto out_fail;
        }
        buttons[i].code = reg;

        buttons[i].desc = of_get_property(pp, "label", NULL);

        if (of_property_read_u32(pp, "linux,input-type", &reg) == 0)
            buttons[i].type = reg;
        else
            buttons[i].type = EV_KEY;

        buttons[i].wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);

        if (of_property_read_u32(pp, "debounce-interval", &reg) == 0)
            buttons[i].debounce_interval = reg;
        else
            buttons[i].debounce_interval = 5;

        i++;
    }

    pdata->buttons = buttons;

    return 0;

out_fail:
    kfree(buttons);
    return -ENODEV;
}

static int davinci_evm_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	const struct of_device_id *match =
		of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev);
	struct snd_soc_dai_link *dai = (struct snd_soc_dai_link *) match->data;
	struct snd_soc_card_drvdata_davinci *drvdata = NULL;
	struct clk *mclk;
	int ret = 0;

	evm_soc_card.dai_link = dai;

	dai->codec_of_node = of_parse_phandle(np, "ti,audio-codec", 0);
	if (!dai->codec_of_node)
		return -EINVAL;

	dai->cpu_of_node = of_parse_phandle(np, "ti,mcasp-controller", 0);
	if (!dai->cpu_of_node)
		return -EINVAL;

	dai->platform_of_node = dai->cpu_of_node;

	evm_soc_card.dev = &pdev->dev;
	ret = snd_soc_of_parse_card_name(&evm_soc_card, "ti,model");
	if (ret)
		return ret;

	mclk = devm_clk_get(&pdev->dev, "mclk");
	if (PTR_ERR(mclk) == -EPROBE_DEFER) {
		return -EPROBE_DEFER;
	} else if (IS_ERR(mclk)) {
		dev_dbg(&pdev->dev, "mclk not found.\n");
		mclk = NULL;
	}

	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
		return -ENOMEM;

	drvdata->mclk = mclk;

	ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk);

	if (ret < 0) {
		if (!drvdata->mclk) {
			dev_err(&pdev->dev,
				"No clock or clock rate defined.\n");
			return -EINVAL;
		}
		drvdata->sysclk = clk_get_rate(drvdata->mclk);
	} else if (drvdata->mclk) {
		unsigned int requestd_rate = drvdata->sysclk;
		clk_set_rate(drvdata->mclk, drvdata->sysclk);
		drvdata->sysclk = clk_get_rate(drvdata->mclk);
		if (drvdata->sysclk != requestd_rate)
			dev_warn(&pdev->dev,
				 "Could not get requested rate %u using %u.\n",
				 requestd_rate, drvdata->sysclk);
	}

	snd_soc_card_set_drvdata(&evm_soc_card, drvdata);
	ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card);

	if (ret)
		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);

	return ret;
}

static int ssp_test_open(struct inode *inode, struct file *file)
{
	int ret, status;

	DENTER();

	ret = 0;

	if (ssp_test_driver_data.opened) {
		DLEAVE(-EBUSY);
		return -EBUSY;
	}

	ssp_test_driver_data.opened = 1;
	ssp_test_driver_data.written = 0;
	file->private_data = &ssp_test_driver_data;

	/* order 1 => 4K requested */
	dev_dbg(TEST_DEV, "Alloc RX Enter\n");
	ret = alloc_slots_buf_dma(&ssp_test_driver_data.rx, BUFSIZE_ORDER);
	if (ret) {
		ret = -EBUSY;
		goto out;
	}
	dev_dbg(TEST_DEV, "Alloc RX OK\n");

	ret = alloc_slots_buf_dma(&ssp_test_driver_data.tx, BUFSIZE_ORDER);
	if (ret) {
		free_slots_buf_dma(&ssp_test_driver_data.rx, BUFSIZE_ORDER);
		ret = -EBUSY;
		goto out;
	}
	dev_dbg(TEST_DEV, "Alloc TX OK\n");

	/* Configure the SSP I2S Driver */
	printk(KERN_ALERT "selected_device: %d\n", selected_device);
	switch (selected_device) {
	case BLUETOOTH:
		dev_dbg(TEST_DEV, "Call intel_mid_i2s_open on BLUETOOTH_FM\n");
		handle_ssp1 = intel_mid_i2s_open(SSP_USAGE_BLUETOOTH_FM);
		intel_mid_i2s_command(handle_ssp1, SSP_CMD_SET_HW_CONFIG,
				      &i2s_ssp_setting);
		break;
	case MODEM:
		dev_dbg(TEST_DEV, "Call intel_mid_i2s_open on MODEM\n");
		handle_ssp1 = intel_mid_i2s_open(SSP_USAGE_MODEM);
		intel_mid_i2s_command(handle_ssp1, SSP_CMD_SET_HW_CONFIG,
				      &i2s_ssp_setting_modem);
		break;
	default:
		dev_dbg(TEST_DEV, "No device selected\n");
		ret = -EBUSY;
		goto out;
	}

	if (!handle_ssp1) {
		dev_dbg(TEST_DEV, "Can not start a SSP with BT/MODEM usage\n");
		free_slots_buf_dma(&ssp_test_driver_data.rx, BUFSIZE_ORDER);
		free_slots_buf_dma(&ssp_test_driver_data.tx, BUFSIZE_ORDER);
		ret = -EBUSY;
		goto out;
	}

	/* Set the Read Callback */
	status = intel_mid_i2s_set_rd_cb(handle_ssp1,
					 ssp_test_read_dma_req_complete);
	/* Set the Write Callback */
	status = intel_mid_i2s_set_wr_cb(handle_ssp1,
					 ssp_test_write_dma_req_complete);

	if (!intel_mid_i2s_command(handle_ssp1, SSP_CMD_ALLOC_TX, NULL)) {
		ssp_test_driver_data.tx_dma_chnl_allocated = 1;
	} else {
		dev_warn(TEST_DEV, "FCT %s Can not alloc TX DMA Channel\n",
			__func__);
	}
	if (!intel_mid_i2s_command(handle_ssp1, SSP_CMD_ALLOC_RX, NULL)) {
		ssp_test_driver_data.rx_dma_chnl_allocated = 1;
	} else {
		dev_warn(TEST_DEV, "FCT %s Can not alloc RX DMA Channel\n",
			__func__);
	}

out:
	DLEAVE(ret);
	return ret;
}

/*
 * Translate OpenFirmware node properties into platform_data
 */
static struct gpio_keys_platform_data *
gpio_keys_get_devtree_pdata(struct device *dev)
{
	struct device_node *node, *pp;
	struct gpio_keys_platform_data *pdata;
	struct gpio_keys_button *button;
	int error;
	int nbuttons;
	int i;
	char *input_name = NULL;
	int ret = -1;

	node = dev->of_node;
	if (!node) {
		error = -ENODEV;
		goto err_out;
	}

	nbuttons = of_get_child_count(node);
	if (nbuttons == 0) {
		error = -ENODEV;
		goto err_out;
	}

	pdata = kzalloc(sizeof(*pdata) + nbuttons * (sizeof *button),
			GFP_KERNEL);
	if (!pdata) {
		error = -ENOMEM;
		goto err_out;
	}

	pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
	pdata->nbuttons = nbuttons;

	pdata->rep = !!of_get_property(node, "autorepeat", NULL);

	ret = of_property_read_string(node, "input-name", &input_name);
	if (0 == ret) {
		pdata->name = input_name;
		PRINT_INFO("input-name=\"%s\"\n", input_name);
	}
	else
		PRINT_WARN("failed to get input-name\n");

	i = 0;
	for_each_child_of_node(node, pp) {
		int gpio;
		enum of_gpio_flags flags;

		if (!of_find_property(pp, "gpios", NULL)) {
			pdata->nbuttons--;
			dev_warn(dev, "Found button without gpios\n");
			continue;
		}

		gpio = of_get_gpio_flags(pp, 0, &flags);
		if (gpio < 0) {
			error = gpio;
			if (error != -EPROBE_DEFER)
				dev_err(dev,
					"Failed to get gpio flags, error: %d\n",
					error);
			goto err_free_pdata;
		}

		button = &pdata->buttons[i++];

		button->gpio = gpio;
		button->active_low = flags & OF_GPIO_ACTIVE_LOW;

		if (of_property_read_u32(pp, "linux,code", &button->code)) {
			dev_err(dev, "Button without keycode: 0x%x\n",
				button->gpio);
			error = -EINVAL;
			goto err_free_pdata;
		}

		button->desc = of_get_property(pp, "label", NULL);

		if (of_property_read_u32(pp, "linux,input-type", &button->type))
			button->type = EV_KEY;

		button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);

		if (of_property_read_u32(pp, "debounce-interval",
					 &button->debounce_interval))
			button->debounce_interval = 5;
	}

static int rk_crypto_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct device *dev = &pdev->dev;
	struct rk_crypto_info *crypto_info;
	int err = 0;

	crypto_info = devm_kzalloc(&pdev->dev,
				   sizeof(*crypto_info), GFP_KERNEL);
	if (!crypto_info) {
		err = -ENOMEM;
		goto err_crypto;
	}

	crypto_info->rst = devm_reset_control_get(dev, "crypto-rst");
	if (IS_ERR(crypto_info->rst)) {
		err = PTR_ERR(crypto_info->rst);
		goto err_crypto;
	}

	reset_control_assert(crypto_info->rst);
	usleep_range(10, 20);
	reset_control_deassert(crypto_info->rst);

	err = devm_add_action_or_reset(dev, rk_crypto_action, crypto_info);
	if (err)
		goto err_crypto;

	spin_lock_init(&crypto_info->lock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	crypto_info->reg = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(crypto_info->reg)) {
		err = PTR_ERR(crypto_info->reg);
		goto err_crypto;
	}

	crypto_info->aclk = devm_clk_get(&pdev->dev, "aclk");
	if (IS_ERR(crypto_info->aclk)) {
		err = PTR_ERR(crypto_info->aclk);
		goto err_crypto;
	}

	crypto_info->hclk = devm_clk_get(&pdev->dev, "hclk");
	if (IS_ERR(crypto_info->hclk)) {
		err = PTR_ERR(crypto_info->hclk);
		goto err_crypto;
	}

	crypto_info->sclk = devm_clk_get(&pdev->dev, "sclk");
	if (IS_ERR(crypto_info->sclk)) {
		err = PTR_ERR(crypto_info->sclk);
		goto err_crypto;
	}

	crypto_info->dmaclk = devm_clk_get(&pdev->dev, "apb_pclk");
	if (IS_ERR(crypto_info->dmaclk)) {
		err = PTR_ERR(crypto_info->dmaclk);
		goto err_crypto;
	}

	crypto_info->irq = platform_get_irq(pdev, 0);
	if (crypto_info->irq < 0) {
		dev_warn(crypto_info->dev,
			 "control Interrupt is not available.\n");
		err = crypto_info->irq;
		goto err_crypto;
	}

	err = devm_request_irq(&pdev->dev, crypto_info->irq,
			       rk_crypto_irq_handle, IRQF_SHARED,
			       "rk-crypto", pdev);

	if (err) {
		dev_err(crypto_info->dev, "irq request failed.\n");
		goto err_crypto;
	}

	crypto_info->dev = &pdev->dev;
	platform_set_drvdata(pdev, crypto_info);

	tasklet_init(&crypto_info->queue_task,
		     rk_crypto_queue_task_cb, (unsigned long)crypto_info);
	tasklet_init(&crypto_info->done_task,
		     rk_crypto_done_task_cb, (unsigned long)crypto_info);
	crypto_init_queue(&crypto_info->queue, 50);

	crypto_info->enable_clk = rk_crypto_enable_clk;
	crypto_info->disable_clk = rk_crypto_disable_clk;
	crypto_info->load_data = rk_load_data;
	crypto_info->unload_data = rk_unload_data;
	crypto_info->enqueue = rk_crypto_enqueue;
	crypto_info->busy = false;

	err = rk_crypto_register(crypto_info);
	if (err) {
		dev_err(dev, "err in register alg");
		goto err_register_alg;
	}

//.........这里部分代码省略.........

static ssize_t ssp_test_read(struct file *file, char __user *buf, size_t count,
			     loff_t *ppos)
{
	struct ssp_test_driver *drv = file->private_data;
	struct slots_buf *sb = &drv->rx;
	ssize_t retval = 0;
	int c;

	DENTER();

	if (!drv || !sb || !sb->buffer) {
		dev_dbg(TEST_DEV, "speech: invalid descriptor in read()\n");
		DLEAVE(-EFAULT);
		return -EFAULT;
	}

	/*
	 * If we can't consume fast enough => drop 1 to be read sample
	 * we can't block the modem NB: when num_write wraps around,
	 * we add 4 to both num_write & num_read so we always ensure
	 * num_write >= num_read
	 */
	if (sb->num_write == (sb->num_read + BT_PCM_NB_SLOTS))
		sb->num_read++;

	/*
	 * Block Until the end of the Read DMA
	 * Do not wait for interrupt, we get the data manually in
	 * logs (brute method).
	 */
	c = wait_event_interruptible_timeout(sb->wait, !sb->dma_running,
					     OPERATION_TIMEOUT);

	if (c == -ERESTARTSYS) {
		/* Signal interruption occured */
		DLEAVE(c);
		return c;
	}

	if (c == 0) {
		/* Timeout occured */
		dev_warn(TEST_DEV, "read: Timeout occured\n");
		intel_mid_i2s_command(handle_ssp1, SSP_CMD_ABORT, NULL);
	}

	intel_mid_i2s_command(handle_ssp1, SSP_CMD_DISABLE_SSP, NULL);

	/* Read ended correctly */
	dev_dbg(TEST_DEV, "read(r=%d,w=%d): copy_to_user(%d) %d bytes to %p\n",
		sb->num_read, sb->num_write, sb->num_read, BT_PCM_SLOT_SIZE,
		&sb->buffer[IDX_NUM_BYTE(sb->num_read)]);

	retval = copy_to_user((void __user *)buf,
			      &sb->buffer[IDX_NUM_BYTE(sb->num_read)],
			      BT_PCM_SLOT_SIZE);

	spin_lock_bh(&sb->lock); /* TODO useless spin_lock */
	sb->num_read++;
	spin_unlock_bh(&sb->lock);

	DLEAVE(retval);
	return retval;
}

// hub-only!! ... and only in reset path, or usb_new_device()
// (used by real hubs and virtual root hubs)
int usb_get_configuration(struct usb_device *dev)
{
	struct device *ddev = &dev->dev;
	int ncfg = dev->descriptor.bNumConfigurations;
	int result = -ENOMEM;
	unsigned int cfgno, length;
	unsigned char *buffer;
	unsigned char *bigbuffer;
 	struct usb_config_descriptor *desc;

	if (ncfg > USB_MAXCONFIG) {
		dev_warn(ddev, "too many configurations: %d, "
		    "using maximum allowed: %d\n", ncfg, USB_MAXCONFIG);
		dev->descriptor.bNumConfigurations = ncfg = USB_MAXCONFIG;
	}

	if (ncfg < 1) {
		dev_err(ddev, "no configurations\n");
		return -EINVAL;
	}

	length = ncfg * sizeof(struct usb_host_config);
	dev->config = kmalloc(length, GFP_KERNEL);
	if (!dev->config)
		goto err2;
	memset(dev->config, 0, length);

	length = ncfg * sizeof(char *);
	dev->rawdescriptors = kmalloc(length, GFP_KERNEL);
	if (!dev->rawdescriptors)
		goto err2;
	memset(dev->rawdescriptors, 0, length);

	buffer = kmalloc(USB_DT_CONFIG_SIZE, GFP_KERNEL);
	if (!buffer)
		goto err2;
	desc = (struct usb_config_descriptor *)buffer;

	for (cfgno = 0; cfgno < ncfg; cfgno++) {
		/* We grab just the first descriptor so we know how long
		 * the whole configuration is */
		result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
		    buffer, USB_DT_CONFIG_SIZE);
		if (result < 0) {
			dev_err(ddev, "unable to read config index %d "
			    "descriptor/%s\n", cfgno, "start");
			goto err;
		} else if (result < 4) {
			dev_err(ddev, "config index %d descriptor too short "
			    "(expected %i, got %i)\n", cfgno,
			    USB_DT_CONFIG_SIZE, result);
			result = -EINVAL;
			goto err;
		}
		length = max((int) le16_to_cpu(desc->wTotalLength),
		    USB_DT_CONFIG_SIZE);

		/* Now that we know the length, get the whole thing */
		bigbuffer = kmalloc(length, GFP_KERNEL);
		if (!bigbuffer) {
			result = -ENOMEM;
			goto err;
		}
		result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
		    bigbuffer, length);
		if (result < 0) {
			dev_err(ddev, "unable to read config index %d "
			    "descriptor/%s\n", cfgno, "all");
			kfree(bigbuffer);
			goto err;
		}
		if (result < length) {
			dev_warn(ddev, "config index %d descriptor too short "
			    "(expected %i, got %i)\n", cfgno, length, result);
			length = result;
		}

		dev->rawdescriptors[cfgno] = bigbuffer;

		result = usb_parse_configuration(&dev->dev, cfgno,
		    &dev->config[cfgno], bigbuffer, length);
		if (result < 0) {
			++cfgno;
			goto err;
		}
	}
	result = 0;

err:
	kfree(buffer);
	dev->descriptor.bNumConfigurations = cfgno;
err2:
	if (result == -ENOMEM)
		dev_err(ddev, "out of memory\n");
	return result;
}

static int sdhci_acpi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	acpi_handle handle = ACPI_HANDLE(dev);
	struct acpi_device *device;
	struct sdhci_acpi_host *c;
	struct sdhci_host *host;
	struct resource *iomem;
	resource_size_t len;
	const char *hid;
	const char *uid;
	int err;

	if (acpi_bus_get_device(handle, &device))
		return -ENODEV;

	if (acpi_bus_get_status(device) || !device->status.present)
		return -ENODEV;

	if (sdhci_acpi_byt_defer(dev))
		return -EPROBE_DEFER;

	hid = acpi_device_hid(device);
	uid = device->pnp.unique_id;

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem)
		return -ENOMEM;

	len = resource_size(iomem);
	if (len < 0x100)
		dev_err(dev, "Invalid iomem size!\n");

	if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
		return -ENOMEM;

	host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
	if (IS_ERR(host))
		return PTR_ERR(host);

	c = sdhci_priv(host);
	c->host = host;
	c->slot = sdhci_acpi_get_slot(hid, uid);
	c->pdev = pdev;
	c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);

	platform_set_drvdata(pdev, c);

	host->hw_name	= "ACPI";
	host->ops	= &sdhci_acpi_ops_dflt;
	host->irq	= platform_get_irq(pdev, 0);

	host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
					    resource_size(iomem));
	if (host->ioaddr == NULL) {
		err = -ENOMEM;
		goto err_free;
	}

	if (c->slot) {
		if (c->slot->probe_slot) {
			err = c->slot->probe_slot(pdev, hid, uid);
			if (err)
				goto err_free;
		}
		if (c->slot->chip) {
			host->ops            = c->slot->chip->ops;
			host->quirks        |= c->slot->chip->quirks;
			host->quirks2       |= c->slot->chip->quirks2;
			host->mmc->caps     |= c->slot->chip->caps;
			host->mmc->caps2    |= c->slot->chip->caps2;
			host->mmc->pm_caps  |= c->slot->chip->pm_caps;
		}
		host->quirks        |= c->slot->quirks;
		host->quirks2       |= c->slot->quirks2;
		host->mmc->caps     |= c->slot->caps;
		host->mmc->caps2    |= c->slot->caps2;
		host->mmc->pm_caps  |= c->slot->pm_caps;
	}

	host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;

	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
		bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);

		if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0, NULL)) {
			dev_warn(dev, "failed to setup card detect gpio\n");
			c->use_runtime_pm = false;
		}
	}

	err = sdhci_add_host(host);
	if (err)
		goto err_free;

	if (c->use_runtime_pm) {
		pm_runtime_set_active(dev);
		pm_suspend_ignore_children(dev, 1);
		pm_runtime_set_autosuspend_delay(dev, 50);
		pm_runtime_use_autosuspend(dev);
//.........这里部分代码省略.........

static int usb_parse_interface(struct device *ddev, int cfgno,
    struct usb_host_config *config, unsigned char *buffer, int size,
    u8 inums[], u8 nalts[])
{
	unsigned char *buffer0 = buffer;
	struct usb_interface_descriptor	*d;
	int inum, asnum;
	struct usb_interface_cache *intfc;
	struct usb_host_interface *alt;
	int i, n;
	int len, retval;
	int num_ep, num_ep_orig;

	d = (struct usb_interface_descriptor *) buffer;
	buffer += d->bLength;
	size -= d->bLength;

	if (d->bLength < USB_DT_INTERFACE_SIZE)
		goto skip_to_next_interface_descriptor;

	/* Which interface entry is this? */
	intfc = NULL;
	inum = d->bInterfaceNumber;
	for (i = 0; i < config->desc.bNumInterfaces; ++i) {
		if (inums[i] == inum) {
			intfc = config->intf_cache[i];
			break;
		}
	}
	if (!intfc || intfc->num_altsetting >= nalts[i])
		goto skip_to_next_interface_descriptor;

	/* Check for duplicate altsetting entries */
	asnum = d->bAlternateSetting;
	for ((i = 0, alt = &intfc->altsetting[0]);
	      i < intfc->num_altsetting;
	     (++i, ++alt)) {
		if (alt->desc.bAlternateSetting == asnum) {
			dev_warn(ddev, "Duplicate descriptor for config %d "
			    "interface %d altsetting %d, skipping\n",
			    cfgno, inum, asnum);
			goto skip_to_next_interface_descriptor;
		}
	}

	++intfc->num_altsetting;
	memcpy(&alt->desc, d, USB_DT_INTERFACE_SIZE);

	/* Skip over any Class Specific or Vendor Specific descriptors;
	 * find the first endpoint or interface descriptor */
	alt->extra = buffer;
	i = find_next_descriptor(buffer, size, USB_DT_ENDPOINT,
	    USB_DT_INTERFACE, &n);
	alt->extralen = i;
	if (n > 0)
		dev_dbg(ddev, "skipped %d descriptor%s after %s\n",
		    n, plural(n), "interface");
	buffer += i;
	size -= i;

	/* Allocate space for the right(?) number of endpoints */
	num_ep = num_ep_orig = alt->desc.bNumEndpoints;
	alt->desc.bNumEndpoints = 0;		// Use as a counter
	if (num_ep > USB_MAXENDPOINTS) {
		dev_warn(ddev, "too many endpoints for config %d interface %d "
		    "altsetting %d: %d, using maximum allowed: %d\n",
		    cfgno, inum, asnum, num_ep, USB_MAXENDPOINTS);
		num_ep = USB_MAXENDPOINTS;
	}

	len = sizeof(struct usb_host_endpoint) * num_ep;
	alt->endpoint = kmalloc(len, GFP_KERNEL);
	if (!alt->endpoint)
		return -ENOMEM;
	memset(alt->endpoint, 0, len);

	/* Parse all the endpoint descriptors */
	n = 0;
	while (size > 0) {
		if (((struct usb_descriptor_header *) buffer)->bDescriptorType
		     == USB_DT_INTERFACE)
			break;
		retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
		    num_ep, buffer, size);
		if (retval < 0)
			return retval;
		++n;

		buffer += retval;
		size -= retval;
	}

	if (n != num_ep_orig)
		dev_warn(ddev, "config %d interface %d altsetting %d has %d "
		    "endpoint descriptor%s, different from the interface "
		    "descriptor's value: %d\n",
		    cfgno, inum, asnum, n, plural(n), num_ep_orig);
	return buffer - buffer0;

skip_to_next_interface_descriptor:
//.........这里部分代码省略.........

static int usb_parse_configuration(struct device *ddev, int cfgidx,
    struct usb_host_config *config, unsigned char *buffer, int size)
{
	unsigned char *buffer0 = buffer;
	int cfgno;
	int nintf, nintf_orig;
	int i, j, n;
	struct usb_interface_cache *intfc;
	unsigned char *buffer2;
	int size2;
	struct usb_descriptor_header *header;
	int len, retval;
	u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES];

	memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
	if (config->desc.bDescriptorType != USB_DT_CONFIG ||
	    config->desc.bLength < USB_DT_CONFIG_SIZE) {
		dev_err(ddev, "invalid descriptor for config index %d: "
		    "type = 0x%X, length = %d\n", cfgidx,
		    config->desc.bDescriptorType, config->desc.bLength);
		return -EINVAL;
	}
	cfgno = config->desc.bConfigurationValue;

	buffer += config->desc.bLength;
	size -= config->desc.bLength;

	nintf = nintf_orig = config->desc.bNumInterfaces;
	if (nintf > USB_MAXINTERFACES) {
		dev_warn(ddev, "config %d has too many interfaces: %d, "
		    "using maximum allowed: %d\n",
		    cfgno, nintf, USB_MAXINTERFACES);
		nintf = USB_MAXINTERFACES;
	}

	/* Go through the descriptors, checking their length and counting the
	 * number of altsettings for each interface */
	n = 0;
	for ((buffer2 = buffer, size2 = size);
	      size2 > 0;
	     (buffer2 += header->bLength, size2 -= header->bLength)) {

		if (size2 < sizeof(struct usb_descriptor_header)) {
			dev_warn(ddev, "config %d descriptor has %d excess "
			    "byte%s, ignoring\n",
			    cfgno, size2, plural(size2));
			break;
		}

		header = (struct usb_descriptor_header *) buffer2;
		if ((header->bLength > size2) || (header->bLength < 2)) {
			dev_warn(ddev, "config %d has an invalid descriptor "
			    "of length %d, skipping remainder of the config\n",
			    cfgno, header->bLength);
			break;
		}

		if (header->bDescriptorType == USB_DT_INTERFACE) {
			struct usb_interface_descriptor *d;
			int inum;

			d = (struct usb_interface_descriptor *) header;
			if (d->bLength < USB_DT_INTERFACE_SIZE) {
				dev_warn(ddev, "config %d has an invalid "
				    "interface descriptor of length %d, "
				    "skipping\n", cfgno, d->bLength);
				continue;
			}

			inum = d->bInterfaceNumber;
			if (inum >= nintf_orig)
				dev_warn(ddev, "config %d has an invalid "
				    "interface number: %d but max is %d\n",
				    cfgno, inum, nintf_orig - 1);

			/* Have we already encountered this interface?
			 * Count its altsettings */
			for (i = 0; i < n; ++i) {
				if (inums[i] == inum)
					break;
			}
			if (i < n) {
				if (nalts[i] < 255)
					++nalts[i];
			} else if (n < USB_MAXINTERFACES) {
				inums[n] = inum;
				nalts[n] = 1;
				++n;
			}

		} else if (header->bDescriptorType == USB_DT_DEVICE ||
			    header->bDescriptorType == USB_DT_CONFIG)
			dev_warn(ddev, "config %d contains an unexpected "
			    "descriptor of type 0x%X, skipping\n",
			    cfgno, header->bDescriptorType);

	}	/* for ((buffer2 = buffer, size2 = size); ...) */
	size = buffer2 - buffer;
	config->desc.wTotalLength = cpu_to_le16(buffer2 - buffer0);

//.........这里部分代码省略.........

static int omap_i2c_init(struct omap_i2c_dev *dev)
{
	u16 psc = 0, scll = 0, sclh = 0, buf = 0;
	u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0;
	unsigned long fclk_rate = 12000000;
	unsigned long timeout;
	unsigned long internal_clk = 0;
	struct clk *fclk;

	if (dev->rev >= OMAP_I2C_REV_2) {
		/* Disable I2C controller before soft reset */
		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
			omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) &
				~(OMAP_I2C_CON_EN));

		omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK);
		/* For some reason we need to set the EN bit before the
		 * reset done bit gets set. */
		timeout = jiffies + OMAP_I2C_TIMEOUT;
		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
		while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
			 SYSS_RESETDONE_MASK)) {
			if (time_after(jiffies, timeout)) {
				dev_warn(dev->dev, "timeout waiting "
						"for controller reset\n");
				return -ETIMEDOUT;
			}
			msleep(1);
		}

		/* SYSC register is cleared by the reset; rewrite it */
		if (dev->rev == OMAP_I2C_REV_ON_2430) {

			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
					   SYSC_AUTOIDLE_MASK);

		} else if (dev->rev >= OMAP_I2C_REV_ON_3430) {
			dev->syscstate = SYSC_AUTOIDLE_MASK;
			dev->syscstate |= SYSC_ENAWAKEUP_MASK;
			dev->syscstate |= (SYSC_IDLEMODE_SMART <<
			      __ffs(SYSC_SIDLEMODE_MASK));
			dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK <<
			      __ffs(SYSC_CLOCKACTIVITY_MASK));

			omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG,
							dev->syscstate);
			/*
			 * Enabling all wakup sources to stop I2C freezing on
			 * WFI instruction.
			 * REVISIT: Some wkup sources might not be needed.
			 */
			dev->westate = OMAP_I2C_WE_ALL;
			omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, dev->westate);
		}
	}
	omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);

	if (cpu_class_is_omap1()) {
		/*
		 * The I2C functional clock is the armxor_ck, so there's
		 * no need to get "armxor_ck" separately.  Now, if OMAP2420
		 * always returns 12MHz for the functional clock, we can
		 * do this bit unconditionally.
		 */
		fclk = clk_get(dev->dev, "fck");
		fclk_rate = clk_get_rate(fclk);
		clk_put(fclk);

		/* TRM for 5912 says the I2C clock must be prescaled to be
		 * between 7 - 12 MHz. The XOR input clock is typically
		 * 12, 13 or 19.2 MHz. So we should have code that produces:
		 *
		 * XOR MHz	Divider		Prescaler
		 * 12		1		0
		 * 13		2		1
		 * 19.2		2		1
		 */
		if (fclk_rate > 12000000)
			psc = fclk_rate / 12000000;
	}

	if (!(cpu_class_is_omap1() || cpu_is_omap2420())) {

		/*
		 * HSI2C controller internal clk rate should be 19.2 Mhz for
		 * HS and for all modes on 2430. On 34xx we can use lower rate
		 * to get longer filter period for better noise suppression.
		 * The filter is iclk (fclk for HS) period.
		 */
		if (dev->speed > 400 || cpu_is_omap2430())
			internal_clk = 19200;
		else if (dev->speed > 100)
			internal_clk = 9600;
		else
			internal_clk = 4000;
		fclk = clk_get(dev->dev, "fck");
		fclk_rate = clk_get_rate(fclk) / 1000;
		clk_put(fclk);

		/* Compute prescaler divisor */
//.........这里部分代码省略.........

static int serial_omap_probe(struct platform_device *pdev)
{
	struct uart_omap_port	*up;
	struct resource		*mem, *irq;
	struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
	int ret;

	if (pdev->dev.of_node)
		omap_up_info = of_get_uart_port_info(&pdev->dev);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "no mem resource?\n");
		return -ENODEV;
	}

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq) {
		dev_err(&pdev->dev, "no irq resource?\n");
		return -ENODEV;
	}

	if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
				pdev->dev.driver->name)) {
		dev_err(&pdev->dev, "memory region already claimed\n");
		return -EBUSY;
	}

	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
	    omap_up_info->DTR_present) {
		ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
		if (ret < 0)
			return ret;
		ret = gpio_direction_output(omap_up_info->DTR_gpio,
					    omap_up_info->DTR_inverted);
		if (ret < 0)
			return ret;
	}

	up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
	if (!up)
		return -ENOMEM;

	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
	    omap_up_info->DTR_present) {
		up->DTR_gpio = omap_up_info->DTR_gpio;
		up->DTR_inverted = omap_up_info->DTR_inverted;
	} else
		up->DTR_gpio = -EINVAL;
	up->DTR_active = 0;

	up->dev = &pdev->dev;
	up->port.dev = &pdev->dev;
	up->port.type = PORT_OMAP;
	up->port.iotype = UPIO_MEM;
	up->port.irq = irq->start;

	up->port.regshift = 2;
	up->port.fifosize = 64;
	up->port.ops = &serial_omap_pops;

	if (pdev->dev.of_node)
		up->port.line = of_alias_get_id(pdev->dev.of_node, "serial");
	else
		up->port.line = pdev->id;

	if (up->port.line < 0) {
		dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n",
								up->port.line);
		ret = -ENODEV;
		goto err_port_line;
	}

	up->pins = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(up->pins)) {
		dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
			 up->port.line, PTR_ERR(up->pins));
		up->pins = NULL;
	}

	sprintf(up->name, "OMAP UART%d", up->port.line);
	up->port.mapbase = mem->start;
	up->port.membase = devm_ioremap(&pdev->dev, mem->start,
						resource_size(mem));
	if (!up->port.membase) {
		dev_err(&pdev->dev, "can't ioremap UART\n");
		ret = -ENOMEM;
		goto err_ioremap;
	}

	up->port.flags = omap_up_info->flags;
	up->port.uartclk = omap_up_info->uartclk;
	if (!up->port.uartclk) {
		up->port.uartclk = DEFAULT_CLK_SPEED;
		dev_warn(&pdev->dev, "No clock speed specified: using default:"
						"%d\n", DEFAULT_CLK_SPEED);
	}

	up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
	up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
//.........这里部分代码省略.........

int
generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
{
	int			retval;
	struct net_device	*net = dev->net;
	struct cdc_state	*info = (void *) &dev->data;
	union {
		void			*buf;
		struct rndis_msg_hdr	*header;
		struct rndis_init	*init;
		struct rndis_init_c	*init_c;
		struct rndis_query	*get;
		struct rndis_query_c	*get_c;
		struct rndis_set	*set;
		struct rndis_set_c	*set_c;
		struct rndis_halt	*halt;
	} u;
	u32			tmp;
	__le32			phym_unspec, *phym;
	int			reply_len;
	unsigned char		*bp;

	/* we can't rely on i/o from stack working, or stack allocation */
	u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
	if (!u.buf)
		return -ENOMEM;
	retval = usbnet_generic_cdc_bind(dev, intf);
	if (retval < 0)
		goto fail;

	u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
	u.init->msg_len = cpu_to_le32(sizeof *u.init);
	u.init->major_version = cpu_to_le32(1);
	u.init->minor_version = cpu_to_le32(0);

	/* max transfer (in spec) is 0x4000 at full speed, but for
	 * TX we'll stick to one Ethernet packet plus RNDIS framing.
	 * For RX we handle drivers that zero-pad to end-of-packet.
	 * Don't let userspace change these settings.
	 *
	 * NOTE: there still seems to be wierdness here, as if we need
	 * to do some more things to make sure WinCE targets accept this.
	 * They default to jumbograms of 8KB or 16KB, which is absurd
	 * for such low data rates and which is also more than Linux
	 * can usually expect to allocate for SKB data...
	 */
	net->hard_header_len += sizeof (struct rndis_data_hdr);
	dev->hard_mtu = net->mtu + net->hard_header_len;

	dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
	if (dev->maxpacket == 0) {
		netif_dbg(dev, probe, dev->net,
			  "dev->maxpacket can't be 0\n");
		retval = -EINVAL;
		goto fail_and_release;
	}

	dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
	dev->rx_urb_size &= ~(dev->maxpacket - 1);
	u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);

	net->netdev_ops = &rndis_netdev_ops;

	retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
	if (unlikely(retval < 0)) {
		/* it might not even be an RNDIS device!! */
		dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
		goto fail_and_release;
	}
	tmp = le32_to_cpu(u.init_c->max_transfer_size);
	if (tmp < dev->hard_mtu) {
		if (tmp <= net->hard_header_len) {
			dev_err(&intf->dev,
				"dev can't take %u byte packets (max %u)\n",
				dev->hard_mtu, tmp);
			retval = -EINVAL;
			goto halt_fail_and_release;
		}
		dev_warn(&intf->dev,
			 "dev can't take %u byte packets (max %u), "
			 "adjusting MTU to %u\n",
			 dev->hard_mtu, tmp, tmp - net->hard_header_len);
		dev->hard_mtu = tmp;
		net->mtu = dev->hard_mtu - net->hard_header_len;
	}

	/* REVISIT:  peripheral "alignment" request is ignored ... */
	dev_dbg(&intf->dev,
		"hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
		dev->hard_mtu, tmp, dev->rx_urb_size,
		1 << le32_to_cpu(u.init_c->packet_alignment));

	/* module has some device initialization code needs to be done right
	 * after RNDIS_INIT */
	if (dev->driver_info->early_init &&
			dev->driver_info->early_init(dev) != 0)
		goto halt_fail_and_release;

	/* Check physical medium */
	phym = NULL;
//.........这里部分代码省略.........

int max77833_irq_init(struct max77833_dev *max77833)
{
	int i;
	int ret;
	u8 i2c_data;

	if (!max77833->irq_gpio) {
		dev_warn(max77833->dev, "No interrupt specified.\n");
		max77833->irq_base = 0;
		return 0;
	}

	if (!max77833->irq_base) {
		dev_err(max77833->dev, "No interrupt base specified.\n");
		return 0;
	}

	mutex_init(&max77833->irqlock);

	max77833->irq = gpio_to_irq(max77833->irq_gpio);
	pr_info("%s:%s irq=%d, irq->gpio=%d\n", MFD_DEV_NAME, __func__,
			max77833->irq, max77833->irq_gpio);

	ret = gpio_request(max77833->irq_gpio, "if_pmic_irq");
	if (ret) {
		dev_err(max77833->dev, "%s: failed requesting gpio %d\n",
			__func__, max77833->irq_gpio);
		return ret;
	}
	gpio_direction_input(max77833->irq_gpio);
	gpio_free(max77833->irq_gpio);

	/* Mask individual interrupt sources */
	for (i = 0; i < MAX77833_IRQ_GROUP_NR; i++) {
		struct i2c_client *i2c;
		/* MUIC IRQ  0:MASK 1:NOT MASK */
		/* Other IRQ 1:MASK 0:NOT MASK */
		if (i >= MUIC_INT1 && i <= MUIC_INT3) {
			max77833->irq_masks_cur[i] = 0x00;
			max77833->irq_masks_cache[i] = 0x00;
		} else {
			max77833->irq_masks_cur[i] = 0xff;
			max77833->irq_masks_cache[i] = 0xff;
		}
		i2c = get_i2c(max77833, i);

		if (IS_ERR_OR_NULL(i2c))
			continue;
		if (max77833_mask_reg[i] == MAX77833_REG_INVALID)
			continue;
		if (i >= MUIC_INT1 && i <= MUIC_INT3)
			max77833_write_reg(i2c, max77833_mask_reg[i], 0x00);
		else
			max77833_write_reg(i2c, max77833_mask_reg[i], 0xff);
	}

	/* Register with genirq */
	for (i = 0; i < MAX77833_IRQ_NR; i++) {
		int cur_irq;
		cur_irq = i + max77833->irq_base;
		irq_set_chip_data(cur_irq, max77833);
		irq_set_chip_and_handler(cur_irq, &max77833_irq_chip,
					 handle_level_irq);
		irq_set_nested_thread(cur_irq, 1);
#ifdef CONFIG_ARM
		set_irq_flags(cur_irq, IRQF_VALID);
#else
		irq_set_noprobe(cur_irq);
#endif
	}

	/* Unmask max77833 interrupt */
	ret = max77833_read_reg(max77833->i2c, MAX77833_PMIC_REG_INTSRC_MASK,
			  &i2c_data);
	if (ret) {
		pr_err("%s:%s fail to read muic reg\n", MFD_DEV_NAME, __func__);
		return ret;
	}

	i2c_data &= ~(MAX77833_IRQSRC_CHG);	/* Unmask charger interrupt */
	i2c_data &= ~(MAX77833_IRQSRC_FG);      /* Unmask fg interrupt */
	i2c_data &= ~(MAX77833_IRQSRC_MUIC);	/* Unmask muic interrupt */

	max77833_write_reg(max77833->i2c, MAX77833_PMIC_REG_INTSRC_MASK,
			   i2c_data);

	pr_info("%s:%s max77833_PMIC_REG_INTSRC_MASK=0x%02x\n",
			MFD_DEV_NAME, __func__, i2c_data);

	ret = request_threaded_irq(max77833->irq, NULL, max77833_irq_thread,
				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
				   "max77833-irq", max77833);
	if (ret) {
		dev_err(max77833->dev, "Failed to request IRQ %d: %d\n",
			max77833->irq, ret);
		return ret;
	}

	return 0;
}

/**
 *	ld_usb_read
 */
static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
			   loff_t *ppos)
{
	struct ld_usb *dev;
	size_t *actual_buffer;
	size_t bytes_to_read;
	int retval = 0;
	int rv;

	dev = file->private_data;

	/* verify that we actually have some data to read */
	if (count == 0)
		goto exit;

	/* lock this object */
	if (down_interruptible(&dev->sem)) {
		retval = -ERESTARTSYS;
		goto exit;
	}

	/* verify that the device wasn't unplugged */
	if (dev->intf == NULL) {
		retval = -ENODEV;
		err("No device or device unplugged %d\n", retval);
		goto unlock_exit;
	}

	/* wait for data */
	spin_lock_irq(&dev->rbsl);
	if (dev->ring_head == dev->ring_tail) {
		dev->interrupt_in_done = 0;
		spin_unlock_irq(&dev->rbsl);
		if (file->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			goto unlock_exit;
		}
		retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
		if (retval < 0)
			goto unlock_exit;
	} else {
		spin_unlock_irq(&dev->rbsl);
	}

	/* actual_bu