This patch adds a GPIO driver based on TI's SSP device. This driver does not
support GPIO-IRQs.
Signed-off-by: Cyril Chemparathy <cy...@ti.com>
---
arch/arm/mach-davinci/include/mach/ti_ssp.h | 5 +
drivers/gpio/Kconfig | 10 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/ti-ssp-gpio.c | 234 +++++++++++++++++++++++++++
4 files changed, 250 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/ti-ssp-gpio.c
diff --git a/arch/arm/mach-davinci/include/mach/ti_ssp.h
b/arch/arm/mach-davinci/include/mach/ti_ssp.h
index 532b0a3..4392b43 100644
--- a/arch/arm/mach-davinci/include/mach/ti_ssp.h
+++ b/arch/arm/mach-davinci/include/mach/ti_ssp.h
@@ -38,6 +38,11 @@ struct ti_ssp_spi_data {
void (*select)(int cs);
};
+struct ti_ssp_gpio_data {
+ struct ti_ssp_port_data port_data;
+ int start;
+};
+
struct ti_ssp_port;
/*
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 510aa20..e400761 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -111,6 +111,16 @@ config GPIO_SCH
This driver can also be built as a module. If so, the module
will be called sch-gpio.
+config GPIO_TI_SSP
+ tristate "TI SSP Controller GPIO Driver"
+ depends on GPIOLIB && TI_SSP
+ help
+ Say yes here to support a virtual GPIO interface on TI SSP ports.
+ Each SSP port translates into 4 GPIOs, with no IRQ support.
+
+ This driver can also be built as a module. If so, the module
+ will be called ti-ssp-gpio.
+
comment "I2C GPIO expanders:"
config GPIO_MAX7300
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index fc6019d..98b4551 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_GPIO_PL061) += pl061.o
obj-$(CONFIG_GPIO_STMPE) += stmpe-gpio.o
obj-$(CONFIG_GPIO_TC35892) += tc35892-gpio.o
obj-$(CONFIG_GPIO_TIMBERDALE) += timbgpio.o
+obj-$(CONFIG_GPIO_TI_SSP) += ti-ssp-gpio.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
obj-$(CONFIG_GPIO_UCB1400) += ucb1400_gpio.o
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
diff --git a/drivers/gpio/ti-ssp-gpio.c b/drivers/gpio/ti-ssp-gpio.c
new file mode 100644
index 0000000..fea4b50
--- /dev/null
+++ b/drivers/gpio/ti-ssp-gpio.c
@@ -0,0 +1,234 @@
+/*
+ * Sequencer Serial Port (SSP) based virtual GPIO driver
+ *
+ * Copyright (C) 2010 Texas Instruments Inc
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+
+#include <mach/ti_ssp.h>
+
+struct ti_ssp_gpio {
+ const struct ti_ssp_gpio_data *pdata;
+ struct ti_ssp_port_data port_data;
+ struct gpio_chip chip;
+#define chip2gpio(chip) container_of(chip, struct ti_ssp_gpio, chip)
+ struct device *dev;
+ spinlock_t lock;
+ struct ti_ssp_port *ssp;
+ u8 out;
+};
+
+static int attach_ssp(struct ti_ssp_gpio *gpio)
+{
+ struct ti_ssp_port *ssp;
+
+ if (gpio->ssp)
+ return 0;
+
+ ssp = ti_ssp_open(&gpio->port_data);
+ if (IS_ERR(ssp))
+ return PTR_ERR(ssp);
+ gpio->ssp = ssp;
+
+ return 0;
+}
+
+static int direction_in(struct gpio_chip *chip, unsigned gpio_num)
+{
+ struct ti_ssp_gpio *gpio = chip2gpio(chip);
+ int error = 0;
+
+ spin_lock(&gpio->lock);
+
+ gpio->port_data.iosel &= ~SSP_PIN_MASK(gpio_num);
+ gpio->port_data.iosel |= SSP_PIN_SEL(gpio_num, SSP_IN);
+
+ if (!gpio->ssp)
+ error = attach_ssp(gpio);
+ else
+ error = ti_ssp_set_iosel(gpio->ssp, gpio->port_data.iosel);
+
+ spin_unlock(&gpio->lock);
+
+ return error;
+}
+
+static int direction_out(struct gpio_chip *chip, unsigned gpio_num, int val)
+{
+ struct ti_ssp_gpio *gpio = chip2gpio(chip);
+ int error;
+
+ spin_lock(&gpio->lock);
+
+ gpio->port_data.iosel &= ~SSP_PIN_MASK(gpio_num);
+ gpio->port_data.iosel |= SSP_PIN_SEL(gpio_num, SSP_OUT);
+
+ if (!gpio->ssp)
+ error = attach_ssp(gpio);
+ else
+ error = ti_ssp_set_iosel(gpio->ssp, gpio->port_data.iosel);
+
+ if (error < 0)
+ goto error;
+
+ if (val)
+ gpio->out |= BIT(gpio_num);
+ else
+ gpio->out &= ~BIT(gpio_num);
+
+ error = ti_ssp_raw_write(gpio->ssp, gpio->out);
+
+error:
+ spin_unlock(&gpio->lock);
+ return error;
+}
+
+static int value_get(struct gpio_chip *chip, unsigned gpio_num)
+{
+ struct ti_ssp_gpio *gpio = chip2gpio(chip);
+ int error;
+
+ spin_lock(&gpio->lock);
+
+ error = attach_ssp(gpio);
+ if (error < 0)
+ goto error;
+
+ error = ti_ssp_raw_read(gpio->ssp);
+ if (error >= 0)
+ error = (error & BIT(gpio_num)) ? 1 : 0;
+
+error:
+ spin_unlock(&gpio->lock);
+ return error;
+}
+
+static void value_set(struct gpio_chip *chip, unsigned gpio_num, int val)
+{
+ struct ti_ssp_gpio *gpio = chip2gpio(chip);
+
+ spin_lock(&gpio->lock);
+ if (attach_ssp(gpio) < 0)
+ return;
+ if (val)
+ gpio->out |= BIT(gpio_num);
+ else
+ gpio->out &= ~BIT(gpio_num);
+ ti_ssp_raw_write(gpio->ssp, gpio->out);
+ spin_unlock(&gpio->lock);
+}
+
+static int __devinit ti_ssp_gpio_probe(struct platform_device *pdev)
+{
+ const struct ti_ssp_gpio_data *pdata = pdev->dev.platform_data;
+ struct device *dev = &pdev->dev;
+ struct ti_ssp_gpio *gpio;
+ int error;
+
+ if (!pdata) {
+ dev_err(dev, "platform data not found\n");
+ return -EINVAL;
+ }
+
+ gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
+ if (!gpio) {
+ dev_err(dev, "cannot allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ gpio->dev = dev;
+ gpio->pdata = pdata;
+ gpio->port_data = pdata->port_data;
+ gpio->port_data.iosel = SSP_PIN_SEL(0, SSP_IN) |
+ SSP_PIN_SEL(1, SSP_IN) |
+ SSP_PIN_SEL(2, SSP_IN) |
+ SSP_PIN_SEL(3, SSP_IN);
+ spin_lock_init(&gpio->lock);
+ platform_set_drvdata(pdev, gpio);
+
+ gpio->chip.base = gpio->pdata->start;
+ gpio->chip.ngpio = 4;
+ gpio->chip.dev = &pdev->dev;
+ gpio->chip.label = "ti_ssp_gpio";
+ gpio->chip.owner = THIS_MODULE;
+ gpio->chip.get = value_get;
+ gpio->chip.set = value_set;
+ gpio->chip.direction_input = direction_in;
+ gpio->chip.direction_output = direction_out;
+
+ error = gpiochip_add(&gpio->chip);
+ if (error < 0) {
+ dev_err(dev, "gpio chip registration failed (%d)\n", error);
+ goto error;
+ }
+
+ dev_info(dev, "ssp gpio interface registered\n");
+ return 0;
+
+error:
+ kfree(gpio);
+ return error;
+}
+
+static int __devexit ti_ssp_gpio_remove(struct platform_device *pdev)
+{
+ struct ti_ssp_gpio *gpio = platform_get_drvdata(pdev);
+ int error;
+
+ error = gpiochip_remove(&gpio->chip);
+ if (error < 0)
+ return error;
+
+ if (gpio->ssp)
+ ti_ssp_close(gpio->ssp);
+ kfree(gpio);
+
+ return 0;
+}
+
+static struct platform_driver ti_ssp_gpio_driver = {
+ .probe = ti_ssp_gpio_probe,
+ .remove = __devexit_p(ti_ssp_gpio_remove),
+ .driver.name = "ti-ssp-gpio",
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init ti_ssp_gpio_init(void)
+{
+ return platform_driver_register(&ti_ssp_gpio_driver);
+}
+
+static void __exit ti_ssp_gpio_exit(void)
+{
+ platform_driver_unregister(&ti_ssp_gpio_driver);
+}
+
+subsys_initcall(ti_ssp_gpio_init);
+module_exit(ti_ssp_gpio_exit);
+
+MODULE_AUTHOR("Cyril Chemparathy <cy...@ti.com>");
+MODULE_DESCRIPTION("GPIO interface for Texas Instruments SSP");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ti-ssp-gpio");
--
1.7.0.4
_______________________________________________
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
