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Commit c203ccdb authored by Bhuvan Varshney's avatar Bhuvan Varshney Committed by Gerrit - the friendly Code Review server
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NFC: Add support for SN100 eSE power management 



Enable support for eSE power management from secure element
HAL service and make sure VEN is not HIGH after boot.

Change-Id: I0740681a62cc879eaf696358592b750332afe992
Signed-off-by: default avatarBhuvan Varshney <bvarshne@codeaurora.org>
parent e9465353

drivers/nfc/nq-nci.c

+63 −3
Original line number Diff line number Diff line 
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.

/* Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -329,6 +329,52 @@ static int nqx_standby_write(struct nqx_dev *nqx_dev, 
	return ret;

}



/*

 * Power management of the SN100 eSE

 * eSE and NFCC both are powered using VEN gpio in SN100,

 * VEN HIGH - eSE and NFCC both are powered on

 * VEN LOW - eSE and NFCC both are power down

 */

static int sn100_ese_pwr(struct nqx_dev *nqx_dev, unsigned long int arg)

{

	int r = -1;



	if (arg == 0) {

		/**

		 * Let's store the NFC VEN pin state

		 * will check stored value in case of eSE power off request,

		 * to find out if NFC MW also sent request to set VEN HIGH

		 * VEN state will remain HIGH if NFC is enabled otherwise

		 * it will be set as LOW

		 */

		nqx_dev->nfc_ven_enabled =

			gpio_get_value(nqx_dev->en_gpio);

		if (!nqx_dev->nfc_ven_enabled) {

			dev_dbg(&nqx_dev->client->dev, "eSE HAL service setting en_gpio HIGH\n");

			gpio_set_value(nqx_dev->en_gpio, 1);

			/* hardware dependent delay */

			usleep_range(1000, 1100);

		} else {

			dev_dbg(&nqx_dev->client->dev, "en_gpio already HIGH\n");

		}

		r = 0;

	} else if (arg == 1) {

		if (!nqx_dev->nfc_ven_enabled) {

			dev_dbg(&nqx_dev->client->dev, "NFC not enabled, disabling en_gpio\n");

			gpio_set_value(nqx_dev->en_gpio, 0);

			/* hardware dependent delay */

			usleep_range(1000, 1100);

		} else {

			dev_dbg(&nqx_dev->client->dev, "keep en_gpio high as NFC is enabled\n");

		}

		r = 0;

	} else if (arg == 3) {

		// eSE power state

		r = gpio_get_value(nqx_dev->en_gpio);

	}

	return r;

}



/*

 * Power management of the eSE

 * NFC & eSE ON : NFC_EN high and eSE_pwr_req high.
@@ -653,16 +699,28 @@ static long nfc_ioctl(struct file *pfile, unsigned int cmd, 
			unsigned long arg)

{

	int r = 0;

	struct nqx_dev *nqx_dev = pfile->private_data;



	if (!nqx_dev)

		return -ENODEV;



	switch (cmd) {

	case NFC_SET_PWR:

		r = nfc_ioctl_power_states(pfile, arg);

		break;

	case ESE_SET_PWR:

		r = nqx_ese_pwr(pfile->private_data, arg);

		if ((nqx_dev->nqx_info.info.chip_type == NFCC_SN100_A) ||

			(nqx_dev->nqx_info.info.chip_type == NFCC_SN100_B))

			r = sn100_ese_pwr(nqx_dev, arg);

		else

			r = nqx_ese_pwr(nqx_dev, arg);

		break;

	case ESE_GET_PWR:

		r = nqx_ese_pwr(pfile->private_data, 3);

		if ((nqx_dev->nqx_info.info.chip_type == NFCC_SN100_A) ||

			(nqx_dev->nqx_info.info.chip_type == NFCC_SN100_B))

			r = sn100_ese_pwr(nqx_dev, 3);

		else

			r = nqx_ese_pwr(nqx_dev, 3);

		break;

	case SET_RX_BLOCK:

		break;
@@ -894,6 +952,8 @@ static int nfcc_hw_check(struct i2c_client *client, struct nqx_dev *nqx_dev) 
		break;

	}



	/*Disable NFC by default to save power on boot*/

	gpio_set_value(enable_gpio, 0);/* ULPM: Disable */

	ret = 0;

	goto done;

drivers/nfc/nq-nci.h

+3 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.

/* Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -48,6 +48,8 @@ enum nfcc_chip_variant { 
	NFCC_NQ_220			= 0x58,	/**< NFCC NQ220 */

	NFCC_NQ_310			= 0x40,	/**< NFCC NQ310 */

	NFCC_NQ_330			= 0x51,	/**< NFCC NQ330 */

	NFCC_SN100_A			= 0xa3,	/**< NFCC SN100_A */

	NFCC_SN100_B			= 0xa4,	/**< NFCC SN100_B */

	NFCC_PN66T			= 0x18,	/**< NFCC PN66T */

	NFCC_NOT_SUPPORTED	        = 0xFF	/**< NFCC is not supported */

};