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Date: Wed, 26 Sep 2012 11:37:07 -0400
From: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To: linux-kernel@...r.kernel.org
Cc: Grant Likely <grant.likely@...retlab.ca>,
Linus Walleij <linus.walleij@...aro.org>,
Jerome Oufella <jerome.oufella@...oirfairelinux.com>
Subject: Re: [PATCH] gpio: add TS-5500 DIO headers support
Hi,
I think the Kconfig patch is wrong, please do not consider this
patchset. I'll send a v2 very soon.
On Tue, 2012-09-25 at 20:42 -0400, Vivien Didelot wrote:
> The Technologic Systems TS-5500 platform provides 3 digital I/O headers:
> DIO1, DIO2, and the LCD port, that may be used as a DIO header.
>
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> Signed-off-by: Jerome Oufella <jerome.oufella@...oirfairelinux.com>
> ---
> drivers/gpio/Kconfig | 8 +
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-ts5500.c | 344 ++++++++++++++++++++++++++++++
> include/linux/platform_data/gpio-ts5500.h | 34 +++
> 4 files changed, 387 insertions(+)
> create mode 100644 drivers/gpio/gpio-ts5500.c
> create mode 100644 include/linux/platform_data/gpio-ts5500.h
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index ba7926f5..f8bf8e1 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -395,6 +395,14 @@ config GPIO_TPS65912
> help
> This driver supports TPS65912 gpio chip
>
> +config GPIO_TS5500
> + tristate "TS-5500 DIO Headers"
> + depends on TS5500
> + help
> + This driver supports the 3 Digital I/O headers of the Technologic
> + Systems TS-5500 platform: DIO1, DIO2, and the LCD port which may be
> + used as a DIO header.
I moved the GPIO_TS5500 entry at the good place in the "Memory mapped
GPIO drivers" section. But I'm still worried about select/depends on.
I removed the TS5500 symbol dependency, which is not defined yet (will
be done in the future board support patch). Does the following entry
seem good?
config GPIO_TS5500
tristate "TS-5500 DIO Headers support"
help
This driver supports the 3 Digital I/O headers of the
Technologic Systems TS-5500 platform: DIO1, DIO2, and the
LCD port which may be used as a DIO header.
Regards,
Vivien
> +
> config GPIO_TWL4030
> tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
> depends on TWL4030_CORE
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 153cace..48e8670 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += gpio-tnetv107x.o
> obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
> obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
> obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
> +obj-$(CONFIG_GPIO_TS5500) += gpio-ts5500.o
> obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o
> obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
> obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
> diff --git a/drivers/gpio/gpio-ts5500.c b/drivers/gpio/gpio-ts5500.c
> new file mode 100644
> index 0000000..d91fee9
> --- /dev/null
> +++ b/drivers/gpio/gpio-ts5500.c
> @@ -0,0 +1,344 @@
> +/*
> + * GPIO (DIO) driver for Technologic Systems TS-5500
> + *
> + * Copyright (c) 2010-2012 Savoir-faire Linux Inc.
> + * Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * The TS-5500 platform has 38 Digital Input/Output lines (DIO), exposed by 3
> + * DIO headers: DIO1, DIO2, and the LCD port which may be used as a DIO header.
> + *
> + * The datasheet is available at:
> + * http://embeddedx86.com/documentation/ts-5500-manual.pdf.
> + * See section 6 "Digital I/O" for details about the pinout.
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/gpio.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_data/gpio-ts5500.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +/*
> + * This array describes the names of the DIO lines, but also the mapping between
> + * the datasheet, and corresponding offsets exposed by the driver.
> + */
> +static const char * const ts5500_pinout[38] = {
> + /* DIO1 Header (offset 0-13) */
> + [0] = "DIO1_0", /* pin 1 */
> + [1] = "DIO1_1", /* pin 3 */
> + [2] = "DIO1_2", /* pin 5 */
> + [3] = "DIO1_3", /* pin 7 */
> + [4] = "DIO1_4", /* pin 9 */
> + [5] = "DIO1_5", /* pin 11 */
> + [6] = "DIO1_6", /* pin 13 */
> + [7] = "DIO1_7", /* pin 15 */
> + [8] = "DIO1_8", /* pin 4 */
> + [9] = "DIO1_9", /* pin 6 */
> + [10] = "DIO1_10", /* pin 8 */
> + [11] = "DIO1_11", /* pin 10 */
> + [12] = "DIO1_12", /* pin 12 */
> + [13] = "DIO1_13", /* pin 14 */
> +
> + /* DIO2 Header (offset 14-26) */
> + [14] = "DIO2_0", /* pin 1 */
> + [15] = "DIO2_1", /* pin 3 */
> + [16] = "DIO2_2", /* pin 5 */
> + [17] = "DIO2_3", /* pin 7 */
> + [18] = "DIO2_4", /* pin 9 */
> + [19] = "DIO2_5", /* pin 11 */
> + [20] = "DIO2_6", /* pin 13 */
> + [21] = "DIO2_7", /* pin 15 */
> + [22] = "DIO2_8", /* pin 4 */
> + [23] = "DIO2_9", /* pin 6 */
> + [24] = "DIO2_10", /* pin 8 */
> + [25] = "DIO2_11", /* pin 10 */
> + [26] = "DIO2_13", /* pin 14 */
> +
> + /* LCD Port as DIO (offset 27-37) */
> + [27] = "LCD_0", /* pin 8 */
> + [28] = "LCD_1", /* pin 7 */
> + [29] = "LCD_2", /* pin 10 */
> + [30] = "LCD_3", /* pin 9 */
> + [31] = "LCD_4", /* pin 12 */
> + [32] = "LCD_5", /* pin 11 */
> + [33] = "LCD_6", /* pin 14 */
> + [34] = "LCD_7", /* pin 13 */
> + [35] = "LCD_EN", /* pin 5 */
> + [36] = "LCD_WR", /* pin 6 */
> + [37] = "LCD_RS", /* pin 3 */
> +};
> +
> +#define IN (1 << 0)
> +#define OUT (1 << 1)
> +#ifndef NO_IRQ
> +#define NO_IRQ -1
> +#endif
> +
> +/*
> + * This structure is used to describe capabilities of DIO lines,
> + * such as available directions, and mapped IRQ (if any).
> + */
> +struct ts5500_dio {
> + const unsigned long value_addr;
> + const int value_bit;
> + const unsigned long control_addr;
> + const int control_bit;
> + const int irq;
> + const int direction;
> +};
> +
> +static const struct ts5500_dio ts5500_dios[] = {
> + /* DIO1 Header (offset 0-13) */
> + [0] = { 0x7b, 0, 0x7a, 0, NO_IRQ, IN | OUT },
> + [1] = { 0x7b, 1, 0x7a, 0, NO_IRQ, IN | OUT },
> + [2] = { 0x7b, 2, 0x7a, 0, NO_IRQ, IN | OUT },
> + [3] = { 0x7b, 3, 0x7a, 0, NO_IRQ, IN | OUT },
> + [4] = { 0x7b, 4, 0x7a, 1, NO_IRQ, IN | OUT },
> + [5] = { 0x7b, 5, 0x7a, 1, NO_IRQ, IN | OUT },
> + [6] = { 0x7b, 6, 0x7a, 1, NO_IRQ, IN | OUT },
> + [7] = { 0x7b, 7, 0x7a, 1, NO_IRQ, IN | OUT },
> + [8] = { 0x7c, 0, 0x7a, 5, NO_IRQ, IN | OUT },
> + [9] = { 0x7c, 1, 0x7a, 5, NO_IRQ, IN | OUT },
> + [10] = { 0x7c, 2, 0x7a, 5, NO_IRQ, IN | OUT },
> + [11] = { 0x7c, 3, 0x7a, 5, NO_IRQ, IN | OUT },
> + [12] = { 0x7c, 4, 0, -1, NO_IRQ, IN },
> + [13] = { 0x7c, 5, 0, -1, 7, IN },
> +
> + /* DIO2 Header (offset 14-26) */
> + [14] = { 0x7e, 0, 0x7d, 0, NO_IRQ, IN | OUT },
> + [15] = { 0x7e, 1, 0x7d, 0, NO_IRQ, IN | OUT },
> + [16] = { 0x7e, 2, 0x7d, 0, NO_IRQ, IN | OUT },
> + [17] = { 0x7e, 3, 0x7d, 0, NO_IRQ, IN | OUT },
> + [18] = { 0x7e, 4, 0x7d, 1, NO_IRQ, IN | OUT },
> + [19] = { 0x7e, 5, 0x7d, 1, NO_IRQ, IN | OUT },
> + [20] = { 0x7e, 6, 0x7d, 1, NO_IRQ, IN | OUT },
> + [21] = { 0x7e, 7, 0x7d, 1, NO_IRQ, IN | OUT },
> + [22] = { 0x7f, 0, 0x7d, 5, NO_IRQ, IN | OUT },
> + [23] = { 0x7f, 1, 0x7d, 5, NO_IRQ, IN | OUT },
> + [24] = { 0x7f, 2, 0x7d, 5, NO_IRQ, IN | OUT },
> + [25] = { 0x7f, 3, 0x7d, 5, NO_IRQ, IN | OUT },
> + [26] = { 0x7f, 4, 0, -1, 6, IN },
> +
> + /* LCD Port as DIO (offset 27-37) */
> + [27] = { 0x72, 0, 0x7d, 2, NO_IRQ, IN | OUT },
> + [28] = { 0x72, 1, 0x7d, 2, NO_IRQ, IN | OUT },
> + [29] = { 0x72, 2, 0x7d, 2, NO_IRQ, IN | OUT },
> + [30] = { 0x72, 3, 0x7d, 2, NO_IRQ, IN | OUT },
> + [31] = { 0x72, 4, 0x7d, 3, NO_IRQ, IN | OUT },
> + [32] = { 0x72, 5, 0x7d, 3, NO_IRQ, IN | OUT },
> + [33] = { 0x72, 6, 0x7d, 3, NO_IRQ, IN | OUT },
> + [34] = { 0x72, 7, 0x7d, 3, NO_IRQ, IN | OUT },
> + [35] = { 0x73, 0, 0, -1, NO_IRQ, OUT },
> + [36] = { 0x73, 6, 0, -1, NO_IRQ, IN },
> + [37] = { 0x73, 7, 0, -1, 1, IN },
> +};
> +
> +static bool lcd_dio;
> +static bool lcd_irq;
> +static bool dio1_irq;
> +static bool dio2_irq;
> +
> +static DEFINE_SPINLOCK(lock);
> +
> +static inline void io_set_bit(int bit, unsigned long addr)
> +{
> + unsigned long val = inb(addr);
> + __set_bit(bit, &val);
> + outb(val, addr);
> +}
> +
> +static inline void io_clear_bit(int bit, unsigned long addr)
> +{
> + unsigned long val = inb(addr);
> + __clear_bit(bit, &val);
> + outb(val, addr);
> +}
> +
> +static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset)
> +{
> + unsigned long flags;
> + const struct ts5500_dio line = ts5500_dios[offset];
> +
> + /* Some lines cannot be configured as input */
> + if (!(line.direction & IN))
> + return -ENXIO;
> +
> + /* Some others are input only */
> + if (line.direction & OUT) {
> + spin_lock_irqsave(&lock, flags);
> + io_clear_bit(line.control_bit, line.control_addr);
> + spin_unlock_irqrestore(&lock, flags);
> + }
> +
> + return 0;
> +}
> +
> +static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> + const struct ts5500_dio line = ts5500_dios[offset];
> +
> + return (inb(line.value_addr) >> line.value_bit) & 1;
> +}
> +
> +static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val)
> +{
> + unsigned long flags;
> + const struct ts5500_dio line = ts5500_dios[offset];
> +
> + /* Some lines cannot be configured as output */
> + if (!(line.direction & OUT))
> + return -ENXIO;
> +
> + spin_lock_irqsave(&lock, flags);
> + /* Some lines are output only */
> + if (line.direction & IN)
> + io_set_bit(line.control_bit, line.control_addr);
> +
> + if (val)
> + io_set_bit(line.value_bit, line.value_addr);
> + else
> + io_clear_bit(line.value_bit, line.value_addr);
> + spin_unlock_irqrestore(&lock, flags);
> +
> + return 0;
> +}
> +
> +static void ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
> +{
> + unsigned long flags;
> + const struct ts5500_dio line = ts5500_dios[offset];
> +
> + spin_lock_irqsave(&lock, flags);
> + if (val)
> + io_set_bit(line.value_bit, line.value_addr);
> + else
> + io_clear_bit(line.value_bit, line.value_addr);
> + spin_unlock_irqrestore(&lock, flags);
> +}
> +
> +static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +{
> + const struct ts5500_dio line = ts5500_dios[offset];
> +
> + /* Only a few lines are IRQ-capable */
> + if (line.irq != NO_IRQ)
> + return line.irq;
> +
> + /* This allows to bridge a line with the IRQ line of the same header */
> + if (dio1_irq && offset < 13)
> + return ts5500_dios[13].irq;
> + if (dio2_irq && offset > 13 && offset < 26)
> + return ts5500_dios[26].irq;
> + if (lcd_irq && offset > 26 && offset < 37)
> + return ts5500_dios[37].irq;
> +
> + return -ENXIO;
> +}
> +
> +static struct gpio_chip ts5500_gc = {
> + .label = "TS-5500 DIO Headers",
> + .owner = THIS_MODULE,
> + .direction_input = ts5500_gpio_input,
> + .get = ts5500_gpio_get,
> + .direction_output = ts5500_gpio_output,
> + .set = ts5500_gpio_set,
> + .to_irq = ts5500_gpio_to_irq,
> + .names = ts5500_pinout,
> + .ngpio = 27,
> + .base = -1,
> +};
> +
> +static int __devinit ts5500_gpio_probe(struct platform_device *pdev)
> +{
> + int ret;
> + unsigned long flags;
> + struct ts5500_gpio_platform_data *pdata = pdev->dev.platform_data;
> +
> + if (pdata) {
> + ts5500_gc.base = pdata->base;
> + dio1_irq = pdata->dio1_irq;
> + dio2_irq = pdata->dio2_irq;
> + if (pdata->lcd_dio) {
> + lcd_dio = true;
> + lcd_irq = pdata->lcd_irq;
> + ts5500_gc.ngpio = 38;
> + }
> + }
> +
> + if (!devm_request_region(&pdev->dev, 0x7a, 3, "DIO1 Header")) {
> + dev_err(&pdev->dev, "failed to request DIO1 ports (0x7a-7c)\n");
> + return -EBUSY;
> + }
> +
> + if (!devm_request_region(&pdev->dev, 0x7d, 3, "DIO2 Header")) {
> + dev_err(&pdev->dev, "failed to request DIO2 ports (0x7d-7f)\n");
> + return -EBUSY;
> + }
> +
> + if (lcd_dio &&
> + !devm_request_region(&pdev->dev, 0x72, 2, "LCD Port as DIO")) {
> + dev_err(&pdev->dev, "failed to request LCD ports (0x72-73)\n");
> + return -EBUSY;
> + }
> +
> + platform_set_drvdata(pdev, &ts5500_gc);
> +
> + ret = gpiochip_add(&ts5500_gc);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to register the gpio chip\n");
> + return ret;
> + }
> +
> + /* Enable IRQ generation */
> + spin_lock_irqsave(&lock, flags);
> + io_set_bit(7, 0x7a); /* DIO1_13 on IRQ7 */
> + io_set_bit(7, 0x7d); /* DIO2_13 on IRQ6 */
> + if (lcd_dio) {
> + io_clear_bit(4, 0x7d); /* LCD Header usage as DIO */
> + io_set_bit(6, 0x7d); /* LCD_RS on IRQ1 */
> + }
> + spin_unlock_irqrestore(&lock, flags);
> +
> + return 0;
> +}
> +
> +static int __devexit ts5500_gpio_remove(struct platform_device *pdev)
> +{
> + int ret;
> + unsigned long flags;
> +
> + /* Disable IRQ generation */
> + spin_lock_irqsave(&lock, flags);
> + io_clear_bit(7, 0x7a);
> + io_clear_bit(7, 0x7d);
> + if (lcd_dio)
> + io_clear_bit(6, 0x7d);
> + spin_unlock_irqrestore(&lock, flags);
> +
> + ret = gpiochip_remove(&ts5500_gc);
> + if (ret)
> + dev_err(&pdev->dev, "failed to remove the gpio chip\n");
> +
> + return ret;
> +}
> +
> +static struct platform_driver ts5500_gpio_driver = {
> + .driver = {
> + .name = "gpio-ts5500",
> + .owner = THIS_MODULE,
> + },
> + .probe = ts5500_gpio_probe,
> + .remove = __devexit_p(ts5500_gpio_remove),
> +};
> +
> +module_platform_driver(ts5500_gpio_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@...oirfairelinux.com>");
> +MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");
> diff --git a/include/linux/platform_data/gpio-ts5500.h b/include/linux/platform_data/gpio-ts5500.h
> new file mode 100644
> index 0000000..9efd4c3
> --- /dev/null
> +++ b/include/linux/platform_data/gpio-ts5500.h
> @@ -0,0 +1,34 @@
> +/*
> + * GPIO (DIO) header for Technologic Systems TS-5500
> + *
> + * Copyright (c) 2012 Savoir-faire Linux Inc.
> + * Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * The TS-5500 board has 38 Digital Input/Output lines, referred to as DIO in
> + * the product's literature. See section 6 "Digital I/O" of the datasheet:
> + * http://embeddedx86.com/documentation/ts-5500-manual.pdf
> + *
> + * As each IRQable line is input only, the platform data has an option for each
> + * header to return the corresponding IRQ line on request. This might be useful
> + * to bind a bidirectional line with the IRQ line of the same header.
> + */
> +
> +/**
> + * struct ts5500_gpio_platform_data - TS-5500 GPIO configuration
> + * @base: The GPIO base number to use.
> + * @lcd_dio: Use the LCD port as 11 additional digital I/O lines.
> + * @lcd_irq: Return IRQ1 for every line of LCD DIO header.
> + * @dio1_irq: Return IRQ7 for every line of DIO1 header.
> + * @dio2_irq: Return IRQ6 for every line of DIO2 header.
> + */
> +struct ts5500_gpio_platform_data {
> + int base;
> + bool lcd_dio;
> + bool lcd_irq;
> + bool dio1_irq;
> + bool dio2_irq;
> +};
--
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