usb: max3421: Add devicetree support
Adds support for devicetree to the max3421 driver. Signed-off-by: Jules Maselbas <jules.maselbas@grenoble-inp.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>hifive-unleashed-5.1
Jules Maselbas
Greg Kroah-Hartman
parent
c15562c0dc
commit
721fdc83b3
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@ -60,6 +60,7 @@
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#include <linux/spi/spi.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/of.h>
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#include <linux/platform_data/max3421-hcd.h>
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@ -85,6 +86,8 @@
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USB_PORT_STAT_C_OVERCURRENT | \
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USB_PORT_STAT_C_RESET) << 16)
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#define MAX3421_GPOUT_COUNT 8
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enum max3421_rh_state {
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MAX3421_RH_RESET,
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MAX3421_RH_SUSPENDED,
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@ -1672,7 +1675,7 @@ max3421_gpout_set_value(struct usb_hcd *hcd, u8 pin_number, u8 value)
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u8 mask, idx;
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--pin_number;
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if (pin_number > 7)
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if (pin_number >= MAX3421_GPOUT_COUNT)
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return;
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mask = 1u << (pin_number % 4);
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@ -1699,6 +1702,10 @@ max3421_hub_control(struct usb_hcd *hcd, u16 type_req, u16 value, u16 index,
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spin_lock_irqsave(&max3421_hcd->lock, flags);
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pdata = spi->dev.platform_data;
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if (!pdata) {
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dev_err(&spi->dev, "Device platform data is missing\n");
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return -EFAULT;
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}
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switch (type_req) {
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case ClearHubFeature:
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@ -1831,11 +1838,35 @@ static const struct hc_driver max3421_hcd_desc = {
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.bus_resume = max3421_bus_resume,
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};
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static int
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max3421_of_vbus_en_pin(struct device *dev, struct max3421_hcd_platform_data *pdata)
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{
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int retval;
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uint32_t value[2];
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if (!pdata)
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return -EINVAL;
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retval = of_property_read_u32_array(dev->of_node, "maxim,vbus-en-pin", value, 2);
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if (retval) {
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dev_err(dev, "device tree node property 'maxim,vbus-en-pin' is missing\n");
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return retval;
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}
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dev_info(dev, "property 'maxim,vbus-en-pin' value is <%d %d>\n", value[0], value[1]);
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pdata->vbus_gpout = value[0];
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pdata->vbus_active_level = value[1];
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return 0;
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}
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static int
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max3421_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct max3421_hcd *max3421_hcd;
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struct usb_hcd *hcd = NULL;
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struct max3421_hcd_platform_data *pdata = NULL;
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int retval = -ENOMEM;
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if (spi_setup(spi) < 0) {
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@ -1843,6 +1874,42 @@ max3421_probe(struct spi_device *spi)
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return -EFAULT;
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}
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if (!spi->irq) {
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dev_err(dev, "Failed to get SPI IRQ");
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return -EFAULT;
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}
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if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
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pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(&spi->dev, "failed to allocate memory for private data\n");
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retval = -ENOMEM;
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goto error;
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}
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retval = max3421_of_vbus_en_pin(dev, pdata);
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if (retval)
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goto error;
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spi->dev.platform_data = pdata;
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}
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pdata = spi->dev.platform_data;
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if (!pdata) {
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dev_err(&spi->dev, "driver configuration data is not provided\n");
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retval = -EFAULT;
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goto error;
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}
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if (pdata->vbus_active_level > 1) {
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dev_err(&spi->dev, "vbus active level value %d is out of range (0/1)\n", pdata->vbus_active_level);
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retval = -EINVAL;
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goto error;
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}
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if (pdata->vbus_gpout < 1 || pdata->vbus_gpout > MAX3421_GPOUT_COUNT) {
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dev_err(&spi->dev, "vbus gpout value %d is out of range (1..8)\n", pdata->vbus_gpout);
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retval = -EINVAL;
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goto error;
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}
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hcd = usb_create_hcd(&max3421_hcd_desc, &spi->dev,
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dev_name(&spi->dev));
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if (!hcd) {
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@ -1885,6 +1952,11 @@ max3421_probe(struct spi_device *spi)
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return 0;
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error:
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if (IS_ENABLED(CONFIG_OF) && dev->of_node && pdata) {
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devm_kfree(&spi->dev, pdata);
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spi->dev.platform_data = NULL;
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}
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if (hcd) {
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kfree(max3421_hcd->tx);
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kfree(max3421_hcd->rx);
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@ -1923,17 +1995,30 @@ max3421_remove(struct spi_device *spi)
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spin_unlock_irqrestore(&max3421_hcd->lock, flags);
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if (IS_ENABLED(CONFIG_OF) && spi->dev.platform_data) {
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dev_dbg(&spi->dev, "Freeing platform data structure\n");
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devm_kfree(&spi->dev, spi->dev.platform_data);
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spi->dev.platform_data = NULL;
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}
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free_irq(spi->irq, hcd);
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usb_put_hcd(hcd);
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return 0;
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}
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static const struct of_device_id max3421_of_match_table[] = {
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{ .compatible = "maxim,max3421", },
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{},
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};
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MODULE_DEVICE_TABLE(of, max3421_of_match_table);
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static struct spi_driver max3421_driver = {
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.probe = max3421_probe,
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.remove = max3421_remove,
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.driver = {
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.name = "max3421-hcd",
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.of_match_table = of_match_ptr(max3421_of_match_table),
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},
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};
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