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drivers/gpio/gpio-max730x.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/** |
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* Copyright (C) 2006 Juergen Beisert, Pengutronix * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix * Copyright (C) 2009 Wolfram Sang, Pengutronix * |
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* The Maxim MAX7300/1 device is an I2C/SPI driven GPIO expander. There are * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more * details * Note: * - DIN must be stable at the rising edge of clock. * - when writing: * - always clock in 16 clocks at once * - at DIN: D15 first, D0 last * - D0..D7 = databyte, D8..D14 = commandbyte * - D15 = low -> write command * - when reading * - always clock in 16 clocks at once * - at DIN: D15 first, D0 last * - D0..D7 = dummy, D8..D14 = register address * - D15 = high -> read command * - raise CS and assert it again * - always clock in 16 clocks at once * - at DOUT: D15 first, D0 last * - D0..D7 contains the data from the first cycle * * The driver exports a standard gpiochip interface */ #include <linux/module.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/mutex.h> #include <linux/spi/max7301.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/slab.h> |
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/* * Pin configurations, see MAX7301 datasheet page 6 */ #define PIN_CONFIG_MASK 0x03 #define PIN_CONFIG_IN_PULLUP 0x03 #define PIN_CONFIG_IN_WO_PULLUP 0x02 #define PIN_CONFIG_OUT 0x01 #define PIN_NUMBER 28 static int max7301_direction_input(struct gpio_chip *chip, unsigned offset) { |
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struct max7301 *ts = gpiochip_get_data(chip); |
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u8 *config; |
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u8 offset_bits, pin_config; |
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int ret; /* First 4 pins are unused in the controller */ offset += 4; offset_bits = (offset & 3) << 1; config = &ts->port_config[offset >> 2]; |
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if (ts->input_pullup_active & BIT(offset)) pin_config = PIN_CONFIG_IN_PULLUP; else pin_config = PIN_CONFIG_IN_WO_PULLUP; |
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mutex_lock(&ts->lock); |
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*config = (*config & ~(PIN_CONFIG_MASK << offset_bits)) |
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| (pin_config << offset_bits); |
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ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config); mutex_unlock(&ts->lock); return ret; } static int __max7301_set(struct max7301 *ts, unsigned offset, int value) { if (value) { ts->out_level |= 1 << offset; return ts->write(ts->dev, 0x20 + offset, 0x01); } else { ts->out_level &= ~(1 << offset); return ts->write(ts->dev, 0x20 + offset, 0x00); } } static int max7301_direction_output(struct gpio_chip *chip, unsigned offset, int value) { |
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struct max7301 *ts = gpiochip_get_data(chip); |
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u8 *config; u8 offset_bits; int ret; /* First 4 pins are unused in the controller */ offset += 4; offset_bits = (offset & 3) << 1; config = &ts->port_config[offset >> 2]; mutex_lock(&ts->lock); *config = (*config & ~(PIN_CONFIG_MASK << offset_bits)) | (PIN_CONFIG_OUT << offset_bits); ret = __max7301_set(ts, offset, value); if (!ret) ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config); mutex_unlock(&ts->lock); return ret; } static int max7301_get(struct gpio_chip *chip, unsigned offset) { |
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struct max7301 *ts = gpiochip_get_data(chip); |
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int config, level = -EINVAL; /* First 4 pins are unused in the controller */ offset += 4; mutex_lock(&ts->lock); config = (ts->port_config[offset >> 2] >> ((offset & 3) << 1)) & PIN_CONFIG_MASK; switch (config) { case PIN_CONFIG_OUT: /* Output: return cached level */ level = !!(ts->out_level & (1 << offset)); break; case PIN_CONFIG_IN_WO_PULLUP: case PIN_CONFIG_IN_PULLUP: /* Input: read out */ level = ts->read(ts->dev, 0x20 + offset) & 0x01; } mutex_unlock(&ts->lock); return level; } static void max7301_set(struct gpio_chip *chip, unsigned offset, int value) { |
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struct max7301 *ts = gpiochip_get_data(chip); |
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/* First 4 pins are unused in the controller */ offset += 4; mutex_lock(&ts->lock); __max7301_set(ts, offset, value); mutex_unlock(&ts->lock); } |
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int __max730x_probe(struct max7301 *ts) |
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{ struct device *dev = ts->dev; struct max7301_platform_data *pdata; int i, ret; |
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pdata = dev_get_platdata(dev); |
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mutex_init(&ts->lock); dev_set_drvdata(dev, ts); /* Power up the chip and disable IRQ output */ ts->write(dev, 0x04, 0x01); |
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if (pdata) { ts->input_pullup_active = pdata->input_pullup_active; ts->chip.base = pdata->base; } else { ts->chip.base = -1; } |
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ts->chip.label = dev->driver->name; ts->chip.direction_input = max7301_direction_input; ts->chip.get = max7301_get; ts->chip.direction_output = max7301_direction_output; ts->chip.set = max7301_set; |
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ts->chip.ngpio = PIN_NUMBER; |
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ts->chip.can_sleep = true; |
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ts->chip.parent = dev; |
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ts->chip.owner = THIS_MODULE; |
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ret = gpiochip_add_data(&ts->chip, ts); if (ret) goto exit_destroy; |
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/* |
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* initialize pullups according to platform data and cache the |
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* register values for later use. */ for (i = 1; i < 8; i++) { int j; |
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/* * initialize port_config with "0xAA", which means * input with internal pullup disabled. This is needed * to avoid writing zeros (in the inner for loop), * which is not allowed according to the datasheet. */ |
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ts->port_config[i] = 0xAA; for (j = 0; j < 4; j++) { int offset = (i - 1) * 4 + j; ret = max7301_direction_input(&ts->chip, offset); if (ret) goto exit_destroy; } } |
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return ret; exit_destroy: |
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mutex_destroy(&ts->lock); return ret; } EXPORT_SYMBOL_GPL(__max730x_probe); |
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int __max730x_remove(struct device *dev) |
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{ struct max7301 *ts = dev_get_drvdata(dev); |
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if (ts == NULL) return -ENODEV; |
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/* Power down the chip and disable IRQ output */ ts->write(dev, 0x04, 0x00); |
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gpiochip_remove(&ts->chip); mutex_destroy(&ts->lock); |
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return 0; |
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} EXPORT_SYMBOL_GPL(__max730x_remove); |
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MODULE_AUTHOR("Juergen Beisert, Wolfram Sang"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("MAX730x GPIO-Expanders, generic parts"); |