+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Digital I/O driver for Technologic Systems TS-5500
- *
- * Copyright (c) 2012 Savoir-faire Linux Inc.
- * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
- *
- * Technologic Systems platforms have pin blocks, exposing several Digital
- * Input/Output lines (DIO). This driver aims to support single pin blocks.
- * In that sense, the support is not limited to the TS-5500 blocks.
- * Actually, the following platforms have DIO support:
- *
- * TS-5500:
- * Documentation: https://docs.embeddedts.com/TS-5500
- * Blocks: DIO1, DIO2 and LCD port.
- *
- * TS-5600:
- * Documentation: https://docs.embeddedts.com/TS-5600
- * Blocks: LCD port (identical to TS-5500 LCD).
- */
-
-#include <linux/bitops.h>
-#include <linux/gpio/driver.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-
-/* List of supported Technologic Systems platforms DIO blocks */
-enum ts5500_blocks { TS5500_DIO1, TS5500_DIO2, TS5500_LCD, TS5600_LCD };
-
-struct ts5500_priv {
- const struct ts5500_dio *pinout;
- struct gpio_chip gpio_chip;
- spinlock_t lock;
- bool strap;
- u8 hwirq;
-};
-
-/*
- * Hex 7D is used to control several blocks (e.g. DIO2 and LCD port).
- * This flag ensures that the region has been requested by this driver.
- */
-static bool hex7d_reserved;
-
-/*
- * This structure is used to describe capabilities of DIO lines,
- * such as available directions and connected interrupt (if any).
- */
-struct ts5500_dio {
- const u8 value_addr;
- const u8 value_mask;
- const u8 control_addr;
- const u8 control_mask;
- const bool no_input;
- const bool no_output;
- const u8 irq;
-};
-
-#define TS5500_DIO_IN_OUT(vaddr, vbit, caddr, cbit) \
- { \
- .value_addr = vaddr, \
- .value_mask = BIT(vbit), \
- .control_addr = caddr, \
- .control_mask = BIT(cbit), \
- }
-
-#define TS5500_DIO_IN(addr, bit) \
- { \
- .value_addr = addr, \
- .value_mask = BIT(bit), \
- .no_output = true, \
- }
-
-#define TS5500_DIO_IN_IRQ(addr, bit, _irq) \
- { \
- .value_addr = addr, \
- .value_mask = BIT(bit), \
- .no_output = true, \
- .irq = _irq, \
- }
-
-#define TS5500_DIO_OUT(addr, bit) \
- { \
- .value_addr = addr, \
- .value_mask = BIT(bit), \
- .no_input = true, \
- }
-
-/*
- * Input/Output DIO lines are programmed in groups of 4. Their values are
- * available through 4 consecutive bits in a value port, whereas the direction
- * of these 4 lines is driven by only 1 bit in a control port.
- */
-#define TS5500_DIO_GROUP(vaddr, vbitfrom, caddr, cbit) \
- TS5500_DIO_IN_OUT(vaddr, vbitfrom + 0, caddr, cbit), \
- TS5500_DIO_IN_OUT(vaddr, vbitfrom + 1, caddr, cbit), \
- TS5500_DIO_IN_OUT(vaddr, vbitfrom + 2, caddr, cbit), \
- TS5500_DIO_IN_OUT(vaddr, vbitfrom + 3, caddr, cbit)
-
-/*
- * TS-5500 DIO1 block
- *
- * value control dir hw
- * addr bit addr bit in out irq name pin offset
- *
- * 0x7b 0 0x7a 0 x x DIO1_0 1 0
- * 0x7b 1 0x7a 0 x x DIO1_1 3 1
- * 0x7b 2 0x7a 0 x x DIO1_2 5 2
- * 0x7b 3 0x7a 0 x x DIO1_3 7 3
- * 0x7b 4 0x7a 1 x x DIO1_4 9 4
- * 0x7b 5 0x7a 1 x x DIO1_5 11 5
- * 0x7b 6 0x7a 1 x x DIO1_6 13 6
- * 0x7b 7 0x7a 1 x x DIO1_7 15 7
- * 0x7c 0 0x7a 5 x x DIO1_8 4 8
- * 0x7c 1 0x7a 5 x x DIO1_9 6 9
- * 0x7c 2 0x7a 5 x x DIO1_10 8 10
- * 0x7c 3 0x7a 5 x x DIO1_11 10 11
- * 0x7c 4 x DIO1_12 12 12
- * 0x7c 5 x 7 DIO1_13 14 13
- */
-static const struct ts5500_dio ts5500_dio1[] = {
- TS5500_DIO_GROUP(0x7b, 0, 0x7a, 0),
- TS5500_DIO_GROUP(0x7b, 4, 0x7a, 1),
- TS5500_DIO_GROUP(0x7c, 0, 0x7a, 5),
- TS5500_DIO_IN(0x7c, 4),
- TS5500_DIO_IN_IRQ(0x7c, 5, 7),
-};
-
-/*
- * TS-5500 DIO2 block
- *
- * value control dir hw
- * addr bit addr bit in out irq name pin offset
- *
- * 0x7e 0 0x7d 0 x x DIO2_0 1 0
- * 0x7e 1 0x7d 0 x x DIO2_1 3 1
- * 0x7e 2 0x7d 0 x x DIO2_2 5 2
- * 0x7e 3 0x7d 0 x x DIO2_3 7 3
- * 0x7e 4 0x7d 1 x x DIO2_4 9 4
- * 0x7e 5 0x7d 1 x x DIO2_5 11 5
- * 0x7e 6 0x7d 1 x x DIO2_6 13 6
- * 0x7e 7 0x7d 1 x x DIO2_7 15 7
- * 0x7f 0 0x7d 5 x x DIO2_8 4 8
- * 0x7f 1 0x7d 5 x x DIO2_9 6 9
- * 0x7f 2 0x7d 5 x x DIO2_10 8 10
- * 0x7f 3 0x7d 5 x x DIO2_11 10 11
- * 0x7f 4 x 6 DIO2_13 14 12
- */
-static const struct ts5500_dio ts5500_dio2[] = {
- TS5500_DIO_GROUP(0x7e, 0, 0x7d, 0),
- TS5500_DIO_GROUP(0x7e, 4, 0x7d, 1),
- TS5500_DIO_GROUP(0x7f, 0, 0x7d, 5),
- TS5500_DIO_IN_IRQ(0x7f, 4, 6),
-};
-
-/*
- * TS-5500 LCD port used as DIO block
- * TS-5600 LCD port is identical
- *
- * value control dir hw
- * addr bit addr bit in out irq name pin offset
- *
- * 0x72 0 0x7d 2 x x LCD_0 8 0
- * 0x72 1 0x7d 2 x x LCD_1 7 1
- * 0x72 2 0x7d 2 x x LCD_2 10 2
- * 0x72 3 0x7d 2 x x LCD_3 9 3
- * 0x72 4 0x7d 3 x x LCD_4 12 4
- * 0x72 5 0x7d 3 x x LCD_5 11 5
- * 0x72 6 0x7d 3 x x LCD_6 14 6
- * 0x72 7 0x7d 3 x x LCD_7 13 7
- * 0x73 0 x LCD_EN 5 8
- * 0x73 6 x LCD_WR 6 9
- * 0x73 7 x 1 LCD_RS 3 10
- */
-static const struct ts5500_dio ts5500_lcd[] = {
- TS5500_DIO_GROUP(0x72, 0, 0x7d, 2),
- TS5500_DIO_GROUP(0x72, 4, 0x7d, 3),
- TS5500_DIO_OUT(0x73, 0),
- TS5500_DIO_IN(0x73, 6),
- TS5500_DIO_IN_IRQ(0x73, 7, 1),
-};
-
-static inline void ts5500_set_mask(u8 mask, u8 addr)
-{
- u8 val = inb(addr);
- val |= mask;
- outb(val, addr);
-}
-
-static inline void ts5500_clear_mask(u8 mask, u8 addr)
-{
- u8 val = inb(addr);
- val &= ~mask;
- outb(val, addr);
-}
-
-static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset)
-{
- struct ts5500_priv *priv = gpiochip_get_data(chip);
- const struct ts5500_dio line = priv->pinout[offset];
- unsigned long flags;
-
- if (line.no_input)
- return -ENXIO;
-
- if (line.no_output)
- return 0;
-
- spin_lock_irqsave(&priv->lock, flags);
- ts5500_clear_mask(line.control_mask, line.control_addr);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- return 0;
-}
-
-static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- struct ts5500_priv *priv = gpiochip_get_data(chip);
- const struct ts5500_dio line = priv->pinout[offset];
-
- return !!(inb(line.value_addr) & line.value_mask);
-}
-
-static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val)
-{
- struct ts5500_priv *priv = gpiochip_get_data(chip);
- const struct ts5500_dio line = priv->pinout[offset];
- unsigned long flags;
-
- if (line.no_output)
- return -ENXIO;
-
- spin_lock_irqsave(&priv->lock, flags);
- if (!line.no_input)
- ts5500_set_mask(line.control_mask, line.control_addr);
-
- if (val)
- ts5500_set_mask(line.value_mask, line.value_addr);
- else
- ts5500_clear_mask(line.value_mask, line.value_addr);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- return 0;
-}
-
-static int ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
-{
- struct ts5500_priv *priv = gpiochip_get_data(chip);
- const struct ts5500_dio line = priv->pinout[offset];
- unsigned long flags;
-
- spin_lock_irqsave(&priv->lock, flags);
- if (val)
- ts5500_set_mask(line.value_mask, line.value_addr);
- else
- ts5500_clear_mask(line.value_mask, line.value_addr);
- spin_unlock_irqrestore(&priv->lock, flags);
-
- return 0;
-}
-
-static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct ts5500_priv *priv = gpiochip_get_data(chip);
- const struct ts5500_dio *block = priv->pinout;
- const struct ts5500_dio line = block[offset];
-
- /* Only one pin is connected to an interrupt */
- if (line.irq)
- return line.irq;
-
- /* As this pin is input-only, we may strap it to another in/out pin */
- if (priv->strap)
- return priv->hwirq;
-
- return -ENXIO;
-}
-
-static int ts5500_enable_irq(struct ts5500_priv *priv)
-{
- int ret = 0;
- unsigned long flags;
-
- spin_lock_irqsave(&priv->lock, flags);
- if (priv->hwirq == 7)
- ts5500_set_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
- else if (priv->hwirq == 6)
- ts5500_set_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
- else if (priv->hwirq == 1)
- ts5500_set_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
- else
- ret = -EINVAL;
- spin_unlock_irqrestore(&priv->lock, flags);
-
- return ret;
-}
-
-static void ts5500_disable_irq(struct ts5500_priv *priv)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&priv->lock, flags);
- if (priv->hwirq == 7)
- ts5500_clear_mask(BIT(7), 0x7a); /* DIO1_13 on IRQ7 */
- else if (priv->hwirq == 6)
- ts5500_clear_mask(BIT(7), 0x7d); /* DIO2_13 on IRQ6 */
- else if (priv->hwirq == 1)
- ts5500_clear_mask(BIT(6), 0x7d); /* LCD_RS on IRQ1 */
- else
- dev_err(priv->gpio_chip.parent, "invalid hwirq %d\n",
- priv->hwirq);
- spin_unlock_irqrestore(&priv->lock, flags);
-}
-
-static int ts5500_dio_probe(struct platform_device *pdev)
-{
- enum ts5500_blocks block = platform_get_device_id(pdev)->driver_data;
- struct device *dev = &pdev->dev;
- const char *name = dev_name(dev);
- struct ts5500_priv *priv;
- unsigned long flags;
- int ret;
-
- ret = platform_get_irq(pdev, 0);
- if (ret < 0)
- return ret;
-
- priv = devm_kzalloc(dev, sizeof(struct ts5500_priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
-
- platform_set_drvdata(pdev, priv);
- priv->hwirq = ret;
- spin_lock_init(&priv->lock);
-
- priv->gpio_chip.owner = THIS_MODULE;
- priv->gpio_chip.label = name;
- priv->gpio_chip.parent = dev;
- priv->gpio_chip.direction_input = ts5500_gpio_input;
- priv->gpio_chip.direction_output = ts5500_gpio_output;
- priv->gpio_chip.get = ts5500_gpio_get;
- priv->gpio_chip.set = ts5500_gpio_set;
- priv->gpio_chip.to_irq = ts5500_gpio_to_irq;
- priv->gpio_chip.base = -1;
-
- switch (block) {
- case TS5500_DIO1:
- priv->pinout = ts5500_dio1;
- priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio1);
-
- if (!devm_request_region(dev, 0x7a, 3, name)) {
- dev_err(dev, "failed to request %s ports\n", name);
- return -EBUSY;
- }
- break;
- case TS5500_DIO2:
- priv->pinout = ts5500_dio2;
- priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_dio2);
-
- if (!devm_request_region(dev, 0x7e, 2, name)) {
- dev_err(dev, "failed to request %s ports\n", name);
- return -EBUSY;
- }
-
- if (hex7d_reserved)
- break;
-
- if (!devm_request_region(dev, 0x7d, 1, name)) {
- dev_err(dev, "failed to request %s 7D\n", name);
- return -EBUSY;
- }
-
- hex7d_reserved = true;
- break;
- case TS5500_LCD:
- case TS5600_LCD:
- priv->pinout = ts5500_lcd;
- priv->gpio_chip.ngpio = ARRAY_SIZE(ts5500_lcd);
-
- if (!devm_request_region(dev, 0x72, 2, name)) {
- dev_err(dev, "failed to request %s ports\n", name);
- return -EBUSY;
- }
-
- if (!hex7d_reserved) {
- if (!devm_request_region(dev, 0x7d, 1, name)) {
- dev_err(dev, "failed to request %s 7D\n", name);
- return -EBUSY;
- }
-
- hex7d_reserved = true;
- }
-
- /* Ensure usage of LCD port as DIO */
- spin_lock_irqsave(&priv->lock, flags);
- ts5500_clear_mask(BIT(4), 0x7d);
- spin_unlock_irqrestore(&priv->lock, flags);
- break;
- }
-
- ret = devm_gpiochip_add_data(dev, &priv->gpio_chip, priv);
- if (ret) {
- dev_err(dev, "failed to register the gpio chip\n");
- return ret;
- }
-
- ret = ts5500_enable_irq(priv);
- if (ret) {
- dev_err(dev, "invalid interrupt %d\n", priv->hwirq);
- return ret;
- }
-
- return 0;
-}
-
-static void ts5500_dio_remove(struct platform_device *pdev)
-{
- struct ts5500_priv *priv = platform_get_drvdata(pdev);
-
- ts5500_disable_irq(priv);
-}
-
-static const struct platform_device_id ts5500_dio_ids[] = {
- { "ts5500-dio1", TS5500_DIO1 },
- { "ts5500-dio2", TS5500_DIO2 },
- { "ts5500-dio-lcd", TS5500_LCD },
- { "ts5600-dio-lcd", TS5600_LCD },
- { }
-};
-MODULE_DEVICE_TABLE(platform, ts5500_dio_ids);
-
-static struct platform_driver ts5500_dio_driver = {
- .driver = {
- .name = "ts5500-dio",
- },
- .probe = ts5500_dio_probe,
- .remove = ts5500_dio_remove,
- .id_table = ts5500_dio_ids,
-};
-
-module_platform_driver(ts5500_dio_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
-MODULE_DESCRIPTION("Technologic Systems TS-5500 Digital I/O driver");
projects / thirdparty / kernel / linux.git / commitdiff
