Merge "NFC: Add support for SN100 eSE power management" (c655f49e) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/nfc/nq-nci.c

+70 −5

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.
		@@ -501,6 +547,7 @@ int nfc_ioctl_power_states(struct file *filp, unsigned long arg)
		gpio_set_value(nqx_dev->en_gpio, 0);
		usleep_range(10000, 10100);
		}

		if (nqx_dev->pdata->clk_pin_voting) {
		r = nqx_clock_deselect(nqx_dev);
		if (r < 0)
		@@ -516,8 +563,14 @@ int nfc_ioctl_power_states(struct file *filp, unsigned long arg)
		gpio_set_value(nqx_dev->firm_gpio, 0);
		usleep_range(10000, 10100);
		}

		if (gpio_get_value(nqx_dev->en_gpio)) {
		dev_dbg(&nqx_dev->client->dev, "VEN gpio already high\n");
		} else {
		gpio_set_value(nqx_dev->en_gpio, 1);
		usleep_range(10000, 10100);
		}

		if (nqx_dev->pdata->clk_pin_voting) {
		r = nqx_clock_select(nqx_dev);
		if (r < 0)
		@@ -646,16 +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;

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 /
		};