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Commit ebcc5a0d authored by Mark A. Greer's avatar Mark A. Greer Committed by Samuel Ortiz
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NFC: trf7970a: Set correct Vin voltage in Chip Status Control register 



Currently, the trf7970a driver assumes that the Vin voltage is 5V when
it writes to the 'Chip Status Control' register. That may not be correct
so use the regulator facility to get the Vin voltage and set the VRS5_3
bit correctly when writing to that register.

Signed-off-by: default avatarMark A. Greer <mgreer@animalcreek.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 12e9ade3

drivers/nfc/trf7970a.c

+8 −3
Original line number Diff line number Diff line
@@ -336,6 +336,7 @@ struct trf7970a { 
	struct sk_buff			*rx_skb;

	nfc_digital_cmd_complete_t	cb;

	void				*cb_arg;

	u8				chip_status_ctrl;

	u8				iso_ctrl;

	u8				iso_ctrl_tech;

	u8				modulator_sys_clk_ctrl;
@@ -779,8 +780,7 @@ static int trf7970a_init(struct trf7970a *trf) 
	trf->special_fcn_reg1 = 0;



	ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,

			TRF7970A_CHIP_STATUS_RF_ON |

				TRF7970A_CHIP_STATUS_VRS5_3);

			trf->chip_status_ctrl | TRF7970A_CHIP_STATUS_RF_ON);

	if (ret)

		goto err_out;
@@ -1245,7 +1245,7 @@ static int trf7970a_probe(struct spi_device *spi) 
	struct device_node *np = spi->dev.of_node;

	const struct spi_device_id *id = spi_get_device_id(spi);

	struct trf7970a *trf;

	int ret;

	int uvolts, ret;



	if (!np) {

		dev_err(&spi->dev, "No Device Tree entry\n");
@@ -1315,6 +1315,11 @@ static int trf7970a_probe(struct spi_device *spi) 
		goto err_destroy_lock;

	}



	uvolts = regulator_get_voltage(trf->regulator);



	if (uvolts > 4000000)

		trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;



	trf->powering_up = true;



	trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,