From 12e9ade309db51e7ea26be3b4fd5bc6057ddc175 Mon Sep 17 00:00:00 2001 From: "Mark A. Greer" Date: Tue, 25 Mar 2014 08:54:35 -0700 Subject: [PATCH] NFC: trf7970a: Allow different Modulator and SYS_CLK Control register values Currently the driver writes the same value to the 'Modulator and SYS_CLK Control' register no matter what RF technology is being used. That works for now but new RF technologies (e.g., ISO/IEC 14443-B) will require different values to be written to that register. To support this, add a member to the trf7970a structure which is set by the RF technology handling code and used by the framing code when it writes to that register. Signed-off-by: Mark A. Greer Signed-off-by: Samuel Ortiz --- drivers/nfc/trf7970a.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index 90ec2ad35932..352aaab807b6 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -338,6 +338,7 @@ struct trf7970a { void *cb_arg; u8 iso_ctrl; u8 iso_ctrl_tech; + u8 modulator_sys_clk_ctrl; u8 special_fcn_reg1; int technology; int framing; @@ -887,9 +888,11 @@ static int trf7970a_config_rf_tech(struct trf7970a *trf, int tech) switch (tech) { case NFC_DIGITAL_RF_TECH_106A: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106; + trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; break; case NFC_DIGITAL_RF_TECH_ISO15693: trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648; + trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_DEPTH_OOK; break; default: dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech); @@ -940,7 +943,7 @@ static int trf7970a_config_framing(struct trf7970a *trf, int framing) trf->iso_ctrl = iso_ctrl; ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL, - TRF7970A_MODULATOR_DEPTH_OOK); + trf->modulator_sys_clk_ctrl); if (ret) return ret; } -- 2.11.0