NFC: nfcmrvl: add chip reset management
Low level driver can specify a GPIO that will be used to reset the chip. Thanks to this the driver can ensure the state of the device at init. Signed-off-by: Vincent Cuissard <cuissard@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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@ -17,6 +17,8 @@
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*/
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include <linux/nfc.h>
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#include <net/nfc/nci.h>
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#include <net/nfc/nci_core.h>
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@ -107,6 +109,16 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
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priv->if_ops = ops;
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priv->dev = dev;
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priv->hci_muxed = (flags & NFCMRVL_DEV_FLAG_HCI_MUXED) ? 1 : 0;
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priv->reset_n_io = NFCMRVL_DEV_FLAG_GET_RESET_N_IO(flags);
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if (priv->reset_n_io) {
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rc = devm_gpio_request_one(dev,
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priv->reset_n_io,
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GPIOF_OUT_INIT_LOW,
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"nfcmrvl_reset_n");
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if (rc < 0)
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nfc_err(dev, "failed to request reset_n io\n");
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}
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if (priv->hci_muxed)
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headroom = NFCMRVL_HCI_EVENT_HEADER_SIZE;
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@ -127,6 +139,8 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
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nci_set_drvdata(priv->ndev, priv);
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nfcmrvl_chip_reset(priv);
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rc = nci_register_device(priv->ndev);
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if (rc) {
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nfc_err(dev, "nci_register_device failed %d\n", rc);
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@ -179,6 +193,22 @@ int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
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}
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EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
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void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
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{
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/*
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* This function does not take care if someone is using the device.
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* To be improved.
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*/
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if (priv->reset_n_io) {
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nfc_info(priv->dev, "reset the chip\n");
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gpio_set_value(priv->reset_n_io, 0);
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usleep_range(5000, 10000);
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gpio_set_value(priv->reset_n_io, 1);
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} else
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nfc_info(priv->dev, "no reset available on this interface\n");
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}
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MODULE_AUTHOR("Marvell International Ltd.");
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MODULE_DESCRIPTION("Marvell NFC driver ver " VERSION);
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MODULE_VERSION(VERSION);
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@ -39,12 +39,18 @@
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#define NFCMRVL_HCI_OCF 0xFE
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#define NFCMRVL_DEV_FLAG_HCI_MUXED (1 << 0)
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#define NFCMRVL_DEV_FLAG_SET_RESET_N_IO(X) ((X) << 16)
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#define NFCMRVL_DEV_FLAG_GET_RESET_N_IO(X) ((X) >> 16)
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struct nfcmrvl_private {
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/* Tell if NCI packets are encapsulated in HCI ones */
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int hci_muxed;
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struct nci_dev *ndev;
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/* Reset IO (0 if not available) */
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int reset_n_io;
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unsigned long flags;
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void *drv_data;
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struct device *dev;
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@ -63,3 +69,5 @@ struct nfcmrvl_private *nfcmrvl_nci_register_dev(void *drv_data,
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struct nfcmrvl_if_ops *ops,
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struct device *dev,
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unsigned int flags);
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void nfcmrvl_chip_reset(struct nfcmrvl_private *priv);
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