From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T7NIo-0003mZ-JO for barebox@lists.infradead.org; Fri, 31 Aug 2012 09:14:13 +0000 From: Steffen Trumtrar Date: Fri, 31 Aug 2012 11:14:07 +0200 Message-Id: <1346404447-31961-3-git-send-email-s.trumtrar@pengutronix.de> In-Reply-To: <1346404447-31961-1-git-send-email-s.trumtrar@pengutronix.de> References: <1346404447-31961-1-git-send-email-s.trumtrar@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] gpio: add driver for stmpe io-expander To: barebox@lists.infradead.org Cc: Steffen Trumtrar Add a driver for the stmpe1601 gpio block. The stmpe io-expanders have multiple blocks (keypad, gpio...) that can be enabled and used. Only gpio is supported atm. This was only tested on a stmpe connected via i2c. It is also possible to connect via spi. Signed-off-by: Steffen Trumtrar --- drivers/Kconfig | 1 + drivers/gpio/Kconfig | 8 +++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-stmpe.c | 155 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 165 insertions(+) create mode 100644 drivers/gpio/Kconfig create mode 100644 drivers/gpio/gpio-stmpe.c diff --git a/drivers/Kconfig b/drivers/Kconfig index 883b0e7..adf8fcd 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -18,5 +18,6 @@ source "drivers/input/Kconfig" source "drivers/watchdog/Kconfig" source "drivers/pwm/Kconfig" source "drivers/dma/Kconfig" +source "drivers/gpio/Kconfig" endmenu diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig new file mode 100644 index 0000000..939cda8 --- /dev/null +++ b/drivers/gpio/Kconfig @@ -0,0 +1,8 @@ +menu "GPIO " + +config STMPE_GPIO + depends on I2C + select I2C_STMPE + bool "STMPE GPIO Expander" + +endmenu diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 7837966..da1bc21 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -1 +1,2 @@ obj-y += gpio.o +obj-$(CONFIG_STMPE_GPIO) += gpio-stmpe.o diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c new file mode 100644 index 0000000..44e7ae6 --- /dev/null +++ b/drivers/gpio/gpio-stmpe.c @@ -0,0 +1,155 @@ +/* + * Copyright (C) 2012 Pengutronix + * Steffen Trumtrar + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include + +#define GPIO_BASE 0x80 +#define GPIO_SET (GPIO_BASE + 0x02) +#define GPIO_CLR (GPIO_BASE + 0x04) +#define GPIO_MP (GPIO_BASE + 0x06) +#define GPIO_SET_DIR (GPIO_BASE + 0x08) +#define GPIO_ED (GPIO_BASE + 0x0a) +#define GPIO_RE (GPIO_BASE + 0x0c) +#define GPIO_FE (GPIO_BASE + 0x0e) +#define GPIO_PULL_UP (GPIO_BASE + 0x10) +#define GPIO_AF (GPIO_BASE + 0x12) +#define GPIO_LT (GPIO_BASE + 0x16) + +#define OFFSET(gpio) (0xff & (1 << (gpio)) ? 1 : 0) + +extern void __iomem *stmpe_gpio_base[]; +extern int stmpe_gpio_count; + +struct stmpe_gpio_chip { + void __iomem *base; + struct gpio_chip chip; + void *ci; +}; + +static void stmpe_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) +{ + struct stmpe_gpio_chip *stmpegpio = container_of(chip, struct stmpe_gpio_chip, chip); + struct stmpe_client_info *ci = (struct stmpe_client_info *)stmpegpio->ci; + int ret; + u8 val; + + ci->read_reg(ci->stmpe, GPIO_MP + OFFSET(gpio), &val); + + val |= 1 << (gpio % 8); + + if (value) + ret = ci->write_reg(ci->stmpe, GPIO_SET + OFFSET(gpio), val); + else + ret = ci->write_reg(ci->stmpe, GPIO_CLR + OFFSET(gpio), val); + + if (ret) + dev_err(chip->dev, "write failed!\n"); +} + +static int stmpe_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) +{ + struct stmpe_gpio_chip *stmpegpio = container_of(chip, struct stmpe_gpio_chip, chip); + struct stmpe_client_info *ci = (struct stmpe_client_info *)stmpegpio->ci; + int ret; + u8 val; + + ci->read_reg(ci->stmpe, GPIO_SET_DIR + OFFSET(gpio), &val); + val &= ~(1 << (gpio % 8)); + ret = ci->write_reg(ci->stmpe, GPIO_SET_DIR + OFFSET(gpio), val); + + if (ret) + dev_err(chip->dev, "couldn't change direction. Write failed!\n"); + + return 0; +} + +static int stmpe_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value) +{ + struct stmpe_gpio_chip *stmpegpio = container_of(chip, struct stmpe_gpio_chip, chip); + struct stmpe_client_info *ci = (struct stmpe_client_info *)stmpegpio->ci; + int ret; + u8 val; + + ci->read_reg(ci->stmpe, GPIO_SET_DIR + OFFSET(gpio), &val); + val |= 1 << (gpio % 8); + ret = ci->write_reg(ci->stmpe, GPIO_SET_DIR + OFFSET(gpio), val); + + stmpe_gpio_set_value(chip, gpio, value); + + if (ret) + dev_err(chip->dev, "couldn't change direction. Write failed!\n"); + + return 0; +} + +static int stmpe_gpio_get_value(struct gpio_chip *chip, unsigned gpio) +{ + struct stmpe_gpio_chip *stmpegpio = container_of(chip, struct stmpe_gpio_chip, chip); + struct stmpe_client_info *ci = (struct stmpe_client_info *)stmpegpio->ci; + u8 val; + int ret; + + ret = ci->read_reg(ci->stmpe, GPIO_MP + OFFSET(gpio), &val); + + if (ret) + dev_err(chip->dev, "read failed\n"); + + return val & (1 << (gpio % 8)) ? 1 : 0; +} + +static struct gpio_ops stmpe_gpio_ops = { + .direction_input = stmpe_gpio_direction_input, + .direction_output = stmpe_gpio_direction_output, + .get = stmpe_gpio_get_value, + .set = stmpe_gpio_set_value, +}; + +static int stmpe_gpio_probe(struct device_d *dev) +{ + struct stmpe_gpio_chip *stmpegpio; + + stmpegpio = xzalloc(sizeof(*stmpegpio)); + + stmpegpio->base = dev_request_mem_region(dev, 0); + stmpegpio->chip.ops = &stmpe_gpio_ops; + stmpegpio->chip.base = 224; + stmpegpio->chip.ngpio = 16; + stmpegpio->chip.dev = dev; + + stmpegpio->ci = dev->platform_data; + + gpiochip_add(&stmpegpio->chip); + + dev_info(dev, "probed stmpe gpiochip%d with base %d\n", dev->id, stmpegpio->chip.base); + return 0; +} + +static struct driver_d stmpe_gpio_driver = { + .name = "stmpe-gpio", + .probe = stmpe_gpio_probe, +}; + +static int stmpe_gpio_add(void) +{ + register_driver(&stmpe_gpio_driver); + return 0; +} +coredevice_initcall(stmpe_gpio_add); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox