From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Walleij Subject: [PATCH 2/2] gpio: wm8994: use the new open drain callback Date: Tue, 12 Apr 2016 09:29:49 +0200 Message-ID: <1460446189-16444-1-git-send-email-linus.walleij@linaro.org> Return-path: Received: from mail-lf0-f48.google.com ([209.85.215.48]:33746 "EHLO mail-lf0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755917AbcDLH3z (ORCPT ); Tue, 12 Apr 2016 03:29:55 -0400 Received: by mail-lf0-f48.google.com with SMTP id e190so12927944lfe.0 for ; Tue, 12 Apr 2016 00:29:54 -0700 (PDT) Sender: linux-gpio-owner@vger.kernel.org List-Id: linux-gpio@vger.kernel.org To: linux-gpio@vger.kernel.org, Alexandre Courbot Cc: Linus Walleij , patches@opensource.wolfsonmicro.com, Mark Brown , Charles Keepax The WM8994 GPIOs clearly have a dedicated open drain control register. Implement support for controlling this from GPIO descriptor tables or other hardware descriptions such as device tree by implementing the .set_single_ended() callback. Before this patch, lines requesting open drain will just be switched to input mode by the framework, thus emulating open drain. But the hardware can do the real thing, so let's support that. As part of this, rename the debugfs string for output mode from "CMOS" to "push-pull" because it is the term used in the framework to signify a tomem-pole CMOS output. Cc: patches@opensource.wolfsonmicro.com Cc: Mark Brown Cc: Charles Keepax Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Use a switch() statement rather than if-constructions --- drivers/gpio/gpio-wm8994.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-wm8994.c b/drivers/gpio/gpio-wm8994.c index b089df99a0d0..744af388c949 100644 --- a/drivers/gpio/gpio-wm8994.c +++ b/drivers/gpio/gpio-wm8994.c @@ -103,6 +103,28 @@ static void wm8994_gpio_set(struct gpio_chip *chip, unsigned offset, int value) wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, WM8994_GPN_LVL, value); } +static int wm8994_gpio_set_single_ended(struct gpio_chip *chip, + unsigned int offset, + enum single_ended_mode mode) +{ + struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); + struct wm8994 *wm8994 = wm8994_gpio->wm8994; + + switch (mode) { + case LINE_MODE_OPEN_DRAIN: + return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, + WM8994_GPN_OP_CFG_MASK, + WM8994_GPN_OP_CFG); + case LINE_MODE_PUSH_PULL: + return wm8994_set_bits(wm8994, WM8994_GPIO_1 + offset, + WM8994_GPN_OP_CFG_MASK, 0); + default: + break; + } + + return -ENOTSUPP; +} + static int wm8994_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { struct wm8994_gpio *wm8994_gpio = gpiochip_get_data(chip); @@ -217,7 +239,7 @@ static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) if (reg & WM8994_GPN_OP_CFG) seq_printf(s, "open drain "); else - seq_printf(s, "CMOS "); + seq_printf(s, "push-pull "); seq_printf(s, "%s (%x)\n", wm8994_gpio_fn(reg & WM8994_GPN_FN_MASK), reg); @@ -235,6 +257,7 @@ static struct gpio_chip template_chip = { .get = wm8994_gpio_get, .direction_output = wm8994_gpio_direction_out, .set = wm8994_gpio_set, + .set_single_ended = wm8994_gpio_set_single_ended, .to_irq = wm8994_gpio_to_irq, .dbg_show = wm8994_gpio_dbg_show, .can_sleep = true, -- 2.4.3