gpio: mcp230xx: Introduce new driver
Introduce driver for I2C based MCP230xx GPIO chips, which are quite common and already well supported by the Linux kernel. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sebastian Reichel
Heiko Schocher
parent
2aefa6e3f2
commit
0b3da993a4
@ -179,6 +179,16 @@ config LPC32XX_GPIO
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help
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Support for the LPC32XX GPIO driver.
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config MCP230XX_GPIO
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bool "MCP230XX GPIO driver"
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depends on DM
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help
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Support for Microchip's MCP230XX I2C connected GPIO devices.
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The following chips are supported:
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- MCP23008
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- MCP23017
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- MCP23018
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config MSCC_SGPIO
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bool "Microsemi Serial GPIO driver"
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depends on DM_GPIO && SOC_VCOREIII
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@ -24,6 +24,7 @@ obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
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obj-$(CONFIG_KONA_GPIO) += kona_gpio.o
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obj-$(CONFIG_MARVELL_GPIO) += mvgpio.o
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obj-$(CONFIG_MARVELL_MFP) += mvmfp.o
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obj-$(CONFIG_MCP230XX_GPIO) += mcp230xx_gpio.o
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obj-$(CONFIG_MXC_GPIO) += mxc_gpio.o
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obj-$(CONFIG_MXS_GPIO) += mxs_gpio.o
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obj-$(CONFIG_PCA953X) += pca953x.o
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235
drivers/gpio/mcp230xx_gpio.c
Normal file
235
drivers/gpio/mcp230xx_gpio.c
Normal file
@ -0,0 +1,235 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021, Collabora Ltd.
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* Copyright (C) 2021, General Electric Company
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* Author(s): Sebastian Reichel <sebastian.reichel@collabora.com>
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*/
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#define LOG_CATEGORY UCLASS_GPIO
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm/gpio.h>
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#include <dm/device_compat.h>
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#include <dt-bindings/gpio/gpio.h>
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enum mcp230xx_type {
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UNKNOWN = 0,
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MCP23008,
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MCP23017,
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MCP23018,
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};
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#define MCP230XX_IODIR 0x00
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#define MCP230XX_GPPU 0x06
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#define MCP230XX_GPIO 0x09
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#define MCP230XX_OLAT 0x0a
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#define BANKSIZE 8
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static int mcp230xx_read(struct udevice *dev, uint reg, uint offset)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int bank = offset / BANKSIZE;
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int mask = 1 << (offset % BANKSIZE);
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int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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int ret;
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ret = dm_i2c_reg_read(dev, (reg << shift) | bank);
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if (ret < 0)
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return ret;
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return !!(ret & mask);
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}
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static int mcp230xx_write(struct udevice *dev, uint reg, uint offset, bool val)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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int bank = offset / BANKSIZE;
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int mask = 1 << (offset % BANKSIZE);
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int shift = (uc_priv->gpio_count / BANKSIZE) - 1;
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return dm_i2c_reg_clrset(dev, (reg << shift) | bank, mask, val ? mask : 0);
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}
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static int mcp230xx_get_value(struct udevice *dev, uint offset)
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{
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int ret;
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ret = mcp230xx_read(dev, MCP230XX_GPIO, offset);
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if (ret < 0) {
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dev_err(dev, "%s error: %d\n", __func__, ret);
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return ret;
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}
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return ret;
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}
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static int mcp230xx_set_value(struct udevice *dev, uint offset, int val)
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{
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int ret;
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ret = mcp230xx_write(dev, MCP230XX_GPIO, offset, val);
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if (ret < 0) {
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dev_err(dev, "%s error: %d\n", __func__, ret);
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return ret;
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}
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return ret;
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}
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static int mcp230xx_get_flags(struct udevice *dev, unsigned int offset,
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ulong *flags)
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{
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int direction, pullup;
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pullup = mcp230xx_read(dev, MCP230XX_GPPU, offset);
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if (pullup < 0) {
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dev_err(dev, "%s error: %d\n", __func__, pullup);
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return pullup;
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}
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direction = mcp230xx_read(dev, MCP230XX_IODIR, offset);
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if (direction < 0) {
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dev_err(dev, "%s error: %d\n", __func__, direction);
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return direction;
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}
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*flags = direction ? GPIOD_IS_IN : GPIOD_IS_OUT;
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if (pullup)
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*flags |= GPIOD_PULL_UP;
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return 0;
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}
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static int mcp230xx_set_flags(struct udevice *dev, uint offset, ulong flags)
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{
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bool input = !(flags & (GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE));
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bool pullup = flags & GPIOD_PULL_UP;
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ulong supported_mask;
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int ret;
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/* Note: active-low is ignored (handled by core) */
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supported_mask = GPIOD_ACTIVE_LOW | GPIOD_MASK_DIR | GPIOD_PULL_UP;
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if (flags & ~supported_mask) {
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dev_err(dev, "%s unsupported flag(s): %lx\n", __func__, flags);
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return -EINVAL;
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}
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ret = mcp230xx_write(dev, MCP230XX_OLAT, offset, !!(flags & GPIOD_IS_OUT_ACTIVE));
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if (ret) {
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dev_err(dev, "%s failed to setup output latch: %d\n", __func__, ret);
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return ret;
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}
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ret = mcp230xx_write(dev, MCP230XX_GPPU, offset, pullup);
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if (ret) {
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dev_err(dev, "%s failed to setup pull-up: %d\n", __func__, ret);
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return ret;
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}
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ret = mcp230xx_write(dev, MCP230XX_IODIR, offset, input);
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if (ret) {
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dev_err(dev, "%s failed to setup direction: %d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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static int mcp230xx_direction_input(struct udevice *dev, uint offset)
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{
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return mcp230xx_set_flags(dev, offset, GPIOD_IS_IN);
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}
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static int mcp230xx_direction_output(struct udevice *dev, uint offset, int val)
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{
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int ret = mcp230xx_set_value(dev, offset, val);
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if (ret < 0) {
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dev_err(dev, "%s error: %d\n", __func__, ret);
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return ret;
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}
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return mcp230xx_set_flags(dev, offset, GPIOD_IS_OUT);
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}
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static int mcp230xx_get_function(struct udevice *dev, uint offset)
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{
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int ret;
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ret = mcp230xx_read(dev, MCP230XX_IODIR, offset);
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if (ret < 0) {
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dev_err(dev, "%s error: %d\n", __func__, ret);
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return ret;
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}
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return ret ? GPIOF_INPUT : GPIOF_OUTPUT;
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}
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static const struct dm_gpio_ops mcp230xx_ops = {
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.direction_input = mcp230xx_direction_input,
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.direction_output = mcp230xx_direction_output,
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.get_value = mcp230xx_get_value,
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.set_value = mcp230xx_set_value,
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.get_function = mcp230xx_get_function,
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.set_flags = mcp230xx_set_flags,
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.get_flags = mcp230xx_get_flags,
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};
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static int mcp230xx_probe(struct udevice *dev)
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{
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struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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char name[32], label[8], *str;
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int addr, gpio_count, size;
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const u8 *tmp;
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switch (dev_get_driver_data(dev)) {
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case MCP23008:
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gpio_count = 8;
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break;
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case MCP23017:
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case MCP23018:
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gpio_count = 16;
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break;
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default:
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return -ENODEV;
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}
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addr = dev_read_addr(dev);
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tmp = dev_read_prop(dev, "label", &size);
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if (tmp) {
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memcpy(label, tmp, sizeof(label) - 1);
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label[sizeof(label) - 1] = '\0';
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snprintf(name, sizeof(name), "%s@%x_", label, addr);
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} else {
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snprintf(name, sizeof(name), "gpio@%x_", addr);
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}
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str = strdup(name);
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if (!str)
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return -ENOMEM;
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uc_priv->bank_name = str;
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uc_priv->gpio_count = gpio_count;
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dev_dbg(dev, "%s is ready\n", str);
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return 0;
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}
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static const struct udevice_id mcp230xx_ids[] = {
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{ .compatible = "microchip,mcp23008", .data = MCP23008, },
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{ .compatible = "microchip,mcp23017", .data = MCP23017, },
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{ .compatible = "microchip,mcp23018", .data = MCP23018, },
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{ }
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};
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U_BOOT_DRIVER(mcp230xx) = {
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.name = "mcp230xx",
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.id = UCLASS_GPIO,
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.ops = &mcp230xx_ops,
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.probe = mcp230xx_probe,
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.of_match = mcp230xx_ids,
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};
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