Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932172Ab2JLTMN (ORCPT ); Fri, 12 Oct 2012 15:12:13 -0400 Received: from mail.work-microwave.de ([62.245.205.51]:41880 "EHLO work-microwave.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758791Ab2JLTMK (ORCPT ); Fri, 12 Oct 2012 15:12:10 -0400 From: Roland Stigge To: grant.likely@secretlab.ca, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, w.sang@pengutronix.de, jbe@pengutronix.de, plagnioj@jcrosoft.com, highguy@gmail.com, broonie@opensource.wolfsonmicro.com Cc: Roland Stigge Subject: [PATCH RFC 4/6 v3] gpio-max730x: Add block GPIO API Date: Fri, 12 Oct 2012 21:11:23 +0200 Message-Id: <1350069085-13283-5-git-send-email-stigge@antcom.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1350069085-13283-1-git-send-email-stigge@antcom.de> References: <1350069085-13283-1-git-send-email-stigge@antcom.de> X-FEAS-SYSTEM-WL: rst@work-microwave.de, 192.168.11.78 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2989 Lines: 102 This patch adds block GPIO API support to the MAX730x driver. Due to hardware constraints in this chip, simultaneous access to GPIO lines can only be done in groups of 8: GPIOs 0-7, 8-15, 16-23, 24-27. However, setting and clearing will be done at once. Signed-off-by: Roland Stigge --- drivers/gpio/gpio-max730x.c | 60 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) --- linux-2.6.orig/drivers/gpio/gpio-max730x.c +++ linux-2.6/drivers/gpio/gpio-max730x.c @@ -146,6 +146,43 @@ static int max7301_get(struct gpio_chip return level; } +static unsigned max7301_get_block(struct gpio_chip *chip, unsigned mask) +{ + struct max7301 *ts = container_of(chip, struct max7301, chip); + int i, j; + unsigned result = 0; + + for (i = 0; i < 4; i++) { + if ((mask >> (i * 8)) & 0xFF) { /* i/o only if necessary */ + u8 in_level = ts->read(ts->dev, 0x44 + i * 8); + u8 in_mask = 0; + u8 out_level = (ts->out_level >> (i * 8 + 4)) & 0xFF; + u8 out_mask = 0; + + for (j = 0; j < 8; j++) { + int offset = 4 + i * 8 + j; + int config = (ts->port_config[offset >> 2] >> + ((offset & 3) << 1)) & + PIN_CONFIG_MASK; + + switch (config) { + case PIN_CONFIG_OUT: + out_mask |= BIT(j); + break; + case PIN_CONFIG_IN_WO_PULLUP: + case PIN_CONFIG_IN_PULLUP: + in_mask |= BIT(j); + } + } + + result |= ((unsigned)(in_level & in_mask) | + (out_level & out_mask)) << (i * 8); + } + } + + return result & mask; +} + static void max7301_set(struct gpio_chip *chip, unsigned offset, int value) { struct max7301 *ts = container_of(chip, struct max7301, chip); @@ -160,6 +197,27 @@ static void max7301_set(struct gpio_chip mutex_unlock(&ts->lock); } +static +void max7301_set_block(struct gpio_chip *chip, unsigned mask, unsigned values) +{ + struct max7301 *ts = container_of(chip, struct max7301, chip); + unsigned changes; + int i; + + mutex_lock(&ts->lock); + + changes = (ts->out_level ^ (values << 4)) & (mask << 4); + ts->out_level ^= changes; + + for (i = 0; i < 4; i++) { + if ((changes >> (i * 8 + 4)) & 0xFF) /* i/o only on change */ + ts->write(ts->dev, 0x44 + i * 8, + (ts->out_level >> (i * 8 + 4)) & 0xFF); + } + + mutex_unlock(&ts->lock); +} + int __devinit __max730x_probe(struct max7301 *ts) { struct device *dev = ts->dev; @@ -183,8 +241,10 @@ int __devinit __max730x_probe(struct max ts->chip.direction_input = max7301_direction_input; ts->chip.get = max7301_get; + ts->chip.get_block = max7301_get_block; ts->chip.direction_output = max7301_direction_output; ts->chip.set = max7301_set; + ts->chip.set_block = max7301_set_block; ts->chip.base = pdata->base; ts->chip.ngpio = PIN_NUMBER; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/