// SPDX-License-Identifier: GPL-2.0 /* * Digital I/O driver for Technologic Systems TS-5500 * * Copyright (c) 2012 Savoir-faire Linux Inc. * Vivien Didelot <[email protected]> * * 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 { … }; struct ts5500_priv { … }; /* * 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 { … }; #define TS5500_DIO_IN_OUT(vaddr, vbit, caddr, cbit) … #define TS5500_DIO_IN(addr, bit) … #define TS5500_DIO_IN_IRQ(addr, bit, _irq) … #define TS5500_DIO_OUT(addr, bit) … /* * 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) … /* * 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[] = …; /* * 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[] = …; /* * 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[] = …; static inline void ts5500_set_mask(u8 mask, u8 addr) { … } static inline void ts5500_clear_mask(u8 mask, u8 addr) { … } static int ts5500_gpio_input(struct gpio_chip *chip, unsigned offset) { … } static int ts5500_gpio_get(struct gpio_chip *chip, unsigned offset) { … } static int ts5500_gpio_output(struct gpio_chip *chip, unsigned offset, int val) { … } static void ts5500_gpio_set(struct gpio_chip *chip, unsigned offset, int val) { … } static int ts5500_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { … } static int ts5500_enable_irq(struct ts5500_priv *priv) { … } static void ts5500_disable_irq(struct ts5500_priv *priv) { … } static int ts5500_dio_probe(struct platform_device *pdev) { … } static void ts5500_dio_remove(struct platform_device *pdev) { … } static const struct platform_device_id ts5500_dio_ids[] = …; MODULE_DEVICE_TABLE(platform, ts5500_dio_ids); static struct platform_driver ts5500_dio_driver = …; module_platform_driver(…) …; MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …;
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