i2c: Add a generic driver to generate ACPI info
Many I2C devices produce roughly the same ACPI data with just things like the GPIO/interrupt information being different. This can be handled by a generic driver along with some information in the device tree. Add a generic i2c driver for this purpose. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Simon Glass
Bin Meng
parent
bddbaf5edf
commit
fd42f263ce
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@ -0,0 +1,42 @@
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I2C generic device
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==================
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This is used only to generate ACPI tables for an I2C device.
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Required properties :
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- compatible : "i2c-chip";
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- reg : I2C chip address
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- acpi,hid : HID name for the device
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Optional properies in addition to device.txt:
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- reset-gpios : GPIO used to assert reset to the device
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- irq-gpios : GPIO used for interrupt (if Interrupt is not used)
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- stop-gpios : GPIO used to stop the device
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- interrupts-extended : Interrupt to use for the device
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- reset-delay-ms : Delay after de-asserting reset, in ms
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- reset-off-delay-ms : Delay after asserting reset (during power off)
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- enable-delay-ms : Delay after asserting enable
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- enable-off-delay-ms : Delay after de-asserting enable (during power off)
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- stop-delay-ms : Delay after de-aserting stop
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- stop-off-delay-ms : Delay after asserting stop (during power off)
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- hid-descr-addr : HID register offset (for Human Interface Devices)
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Example
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-------
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elan-touchscreen@10 {
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compatible = "i2c-chip";
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reg = <0x10>;
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acpi,hid = "ELAN0001";
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acpi,ddn = "ELAN Touchscreen";
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interrupts-extended = <&acpi_gpe GPIO_21_IRQ
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IRQ_TYPE_EDGE_FALLING>;
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linux,probed;
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reset-gpios = <&gpio_n GPIO_36 GPIO_ACTIVE_HIGH>;
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reset-delay-ms = <20>;
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enable-gpios = <&gpio_n GPIO_152 GPIO_ACTIVE_HIGH>;
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enable-delay-ms = <1>;
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acpi,has-power-resource;
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};
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@ -3,6 +3,9 @@
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# (C) Copyright 2000-2007
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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obj-$(CONFIG_DM_I2C) += i2c-uclass.o
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ifdef CONFIG_ACPIGEN
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obj-$(CONFIG_DM_I2C) += acpi_i2c.o
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endif
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obj-$(CONFIG_DM_I2C_GPIO) += i2c-gpio.o
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obj-$(CONFIG_$(SPL_)I2C_CROS_EC_TUNNEL) += cros_ec_tunnel.o
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obj-$(CONFIG_$(SPL_)I2C_CROS_EC_LDO) += cros_ec_ldo.o
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@ -0,0 +1,226 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2019 Google LLC
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <log.h>
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#include <acpi/acpi_device.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_dp.h>
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#ifdef CONFIG_X86
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#include <asm/intel_pinctrl_defs.h>
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#endif
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#include <asm-generic/gpio.h>
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#include <dm/acpi.h>
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static bool acpi_i2c_add_gpios_to_crs(struct acpi_i2c_priv *priv)
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{
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/*
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* Return false if:
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* 1. Request to explicitly disable export of GPIOs in CRS, or
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* 2. Both reset and enable GPIOs are not provided.
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*/
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if (priv->disable_gpio_export_in_crs ||
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(!dm_gpio_is_valid(&priv->reset_gpio) &&
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!dm_gpio_is_valid(&priv->enable_gpio)))
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return false;
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return true;
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}
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static int acpi_i2c_write_gpio(struct acpi_ctx *ctx, struct gpio_desc *gpio,
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int *curindex)
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{
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int ret;
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if (!dm_gpio_is_valid(gpio))
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return -ENOENT;
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acpi_device_write_gpio_desc(ctx, gpio);
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ret = *curindex;
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(*curindex)++;
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return ret;
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}
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int acpi_i2c_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
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{
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int reset_gpio_index = -1, enable_gpio_index = -1, irq_gpio_index = -1;
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enum i2c_device_t type = dev_get_driver_data(dev);
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struct acpi_i2c_priv *priv = dev_get_priv(dev);
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struct acpi_dp *dsd = NULL;
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char scope[ACPI_PATH_MAX];
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char name[ACPI_NAME_MAX];
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int tx_state_val;
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int curindex = 0;
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int ret;
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#ifdef CONFIG_X86
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tx_state_val = PAD_CFG0_TX_STATE;
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#elif defined(CONFIG_SANDBOX)
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tx_state_val = BIT(7); /* test value */
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#else
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#error "Not supported on this architecture"
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#endif
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ret = acpi_get_name(dev, name);
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if (ret)
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return log_msg_ret("name", ret);
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ret = acpi_device_scope(dev, scope, sizeof(scope));
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if (ret)
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return log_msg_ret("scope", ret);
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/* Device */
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acpigen_write_scope(ctx, scope);
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acpigen_write_device(ctx, name);
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acpigen_write_name_string(ctx, "_HID", priv->hid);
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if (type == I2C_DEVICE_HID_OVER_I2C)
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acpigen_write_name_string(ctx, "_CID", "PNP0C50");
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acpigen_write_name_integer(ctx, "_UID", priv->uid);
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acpigen_write_name_string(ctx, "_DDN", priv->desc);
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acpigen_write_sta(ctx, acpi_device_status(dev));
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/* Resources */
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acpigen_write_name(ctx, "_CRS");
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acpigen_write_resourcetemplate_header(ctx);
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acpi_device_write_i2c_dev(ctx, dev);
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/* Use either Interrupt() or GpioInt() */
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if (dm_gpio_is_valid(&priv->irq_gpio)) {
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irq_gpio_index = acpi_i2c_write_gpio(ctx, &priv->irq_gpio,
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&curindex);
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} else {
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ret = acpi_device_write_interrupt_irq(ctx, &priv->irq);
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if (ret < 0)
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return log_msg_ret("irq", ret);
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}
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if (acpi_i2c_add_gpios_to_crs(priv)) {
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reset_gpio_index = acpi_i2c_write_gpio(ctx, &priv->reset_gpio,
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&curindex);
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enable_gpio_index = acpi_i2c_write_gpio(ctx, &priv->enable_gpio,
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&curindex);
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}
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acpigen_write_resourcetemplate_footer(ctx);
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/* Wake capabilities */
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if (priv->wake) {
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acpigen_write_name_integer(ctx, "_S0W", 4);
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acpigen_write_prw(ctx, priv->wake, 3);
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}
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/* DSD */
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if (priv->probed || priv->property_count || priv->compat_string ||
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reset_gpio_index >= 0 || enable_gpio_index >= 0 ||
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irq_gpio_index >= 0) {
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char path[ACPI_PATH_MAX];
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ret = acpi_device_path(dev, path, sizeof(path));
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if (ret)
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return log_msg_ret("path", ret);
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dsd = acpi_dp_new_table("_DSD");
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if (priv->compat_string)
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acpi_dp_add_string(dsd, "compatible",
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priv->compat_string);
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if (priv->probed)
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acpi_dp_add_integer(dsd, "linux,probed", 1);
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if (irq_gpio_index >= 0)
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acpi_dp_add_gpio(dsd, "irq-gpios", path,
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irq_gpio_index, 0,
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priv->irq_gpio.flags &
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GPIOD_ACTIVE_LOW ?
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ACPI_GPIO_ACTIVE_LOW : 0);
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if (reset_gpio_index >= 0)
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acpi_dp_add_gpio(dsd, "reset-gpios", path,
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reset_gpio_index, 0,
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priv->reset_gpio.flags &
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GPIOD_ACTIVE_LOW ?
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ACPI_GPIO_ACTIVE_LOW : 0);
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if (enable_gpio_index >= 0)
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acpi_dp_add_gpio(dsd, "enable-gpios", path,
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enable_gpio_index, 0,
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priv->enable_gpio.flags &
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GPIOD_ACTIVE_LOW ?
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ACPI_GPIO_ACTIVE_LOW : 0);
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/* Generic property list is not supported */
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acpi_dp_write(ctx, dsd);
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}
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/* Power Resource */
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if (priv->has_power_resource) {
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ret = acpi_device_add_power_res(ctx, tx_state_val,
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"\\_SB.GPC0", "\\_SB.SPC0",
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&priv->reset_gpio, priv->reset_delay_ms,
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priv->reset_off_delay_ms, &priv->enable_gpio,
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priv->enable_delay_ms, priv->enable_off_delay_ms,
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&priv->stop_gpio, priv->stop_delay_ms,
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priv->stop_off_delay_ms);
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if (ret)
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return log_msg_ret("power", ret);
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}
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if (priv->hid_desc_reg_offset) {
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ret = acpi_device_write_dsm_i2c_hid(ctx,
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priv->hid_desc_reg_offset);
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if (ret)
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return log_msg_ret("dsm", ret);
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}
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acpigen_pop_len(ctx); /* Device */
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acpigen_pop_len(ctx); /* Scope */
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return 0;
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}
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int acpi_i2c_ofdata_to_platdata(struct udevice *dev)
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{
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struct acpi_i2c_priv *priv = dev_get_priv(dev);
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gpio_request_by_name(dev, "reset-gpios", 0, &priv->reset_gpio,
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GPIOD_IS_OUT);
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gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable_gpio,
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GPIOD_IS_OUT);
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gpio_request_by_name(dev, "irq-gpios", 0, &priv->irq_gpio, GPIOD_IS_IN);
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gpio_request_by_name(dev, "stop-gpios", 0, &priv->stop_gpio,
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GPIOD_IS_OUT);
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irq_get_by_index(dev, 0, &priv->irq);
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priv->hid = dev_read_string(dev, "acpi,hid");
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if (!priv->hid)
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return log_msg_ret("hid", -EINVAL);
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dev_read_u32(dev, "acpi,uid", &priv->uid);
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priv->desc = dev_read_string(dev, "acpi,ddn");
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dev_read_u32(dev, "acpi,wake", &priv->wake);
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priv->probed = dev_read_bool(dev, "linux,probed");
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priv->compat_string = dev_read_string(dev, "acpi,compatible");
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priv->has_power_resource = dev_read_bool(dev,
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"acpi,has-power-resource");
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dev_read_u32(dev, "hid-descr-addr", &priv->hid_desc_reg_offset);
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dev_read_u32(dev, "reset-delay-ms", &priv->reset_delay_ms);
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dev_read_u32(dev, "reset-off-delay-ms", &priv->reset_off_delay_ms);
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dev_read_u32(dev, "enable-delay-ms", &priv->enable_delay_ms);
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dev_read_u32(dev, "enable-off-delay-ms", &priv->enable_off_delay_ms);
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dev_read_u32(dev, "stop-delay-ms", &priv->stop_delay_ms);
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dev_read_u32(dev, "stop-off-delay-ms", &priv->stop_off_delay_ms);
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return 0;
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}
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/* Use name specified in priv or build one from I2C address */
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static int acpi_i2c_get_name(const struct udevice *dev, char *out_name)
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{
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struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
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struct acpi_i2c_priv *priv = dev_get_priv(dev);
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snprintf(out_name, ACPI_NAME_MAX,
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priv->hid_desc_reg_offset ? "H%03X" : "D%03X",
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chip->chip_addr);
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return 0;
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}
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struct acpi_ops acpi_i2c_ops = {
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.fill_ssdt = acpi_i2c_fill_ssdt,
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.get_name = acpi_i2c_get_name,
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};
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@ -0,0 +1,15 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 Google LLC
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*/
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#ifndef __ACPI_I2C_H
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#define __ACPI_I2C_H
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#include <dm/acpi.h>
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extern struct acpi_ops acpi_i2c_ops;
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int acpi_i2c_ofdata_to_platdata(struct udevice *dev);
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#endif
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@ -9,6 +9,8 @@
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#include <i2c.h>
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#include <log.h>
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#include <malloc.h>
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#include <acpi/acpi_device.h>
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#include <dm/acpi.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/pinctrl.h>
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@ -16,6 +18,7 @@
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#include <asm/gpio.h>
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#endif
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#include <linux/delay.h>
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#include "acpi_i2c.h"
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#define I2C_MAX_OFFSET_LEN 4
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@ -749,7 +752,21 @@ UCLASS_DRIVER(i2c_generic) = {
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.name = "i2c_generic",
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};
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static const struct udevice_id generic_chip_i2c_ids[] = {
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{ .compatible = "i2c-chip", .data = I2C_DEVICE_GENERIC },
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#if CONFIG_IS_ENABLED(ACPIGEN)
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{ .compatible = "hid-over-i2c", .data = I2C_DEVICE_HID_OVER_I2C },
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#endif
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{ }
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};
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U_BOOT_DRIVER(i2c_generic_chip_drv) = {
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.name = "i2c_generic_chip_drv",
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.id = UCLASS_I2C_GENERIC,
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.of_match = generic_chip_i2c_ids,
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#if CONFIG_IS_ENABLED(ACPIGEN)
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.ofdata_to_platdata = acpi_i2c_ofdata_to_platdata,
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.priv_auto_alloc_size = sizeof(struct acpi_i2c_priv),
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#endif
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ACPI_OPS_PTR(&acpi_i2c_ops)
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};
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@ -10,7 +10,9 @@
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#define __ACPI_DEVICE_H
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#include <i2c.h>
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#include <irq.h>
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#include <spi.h>
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#include <asm-generic/gpio.h>
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#include <linux/bitops.h>
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struct acpi_ctx;
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@ -235,6 +237,59 @@ struct acpi_spi {
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const char *resource;
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};
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/**
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* struct acpi_i2c_priv - Information read from device tree
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*
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* This is used by devices which want to specify various pieces of ACPI
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* information, including power control. It allows a generic function to
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* generate the information for ACPI, based on device-tree properties.
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*
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* @disable_gpio_export_in_crs: Don't export GPIOs in the CRS
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* @reset_gpio: GPIO used to assert reset to the device
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* @enable_gpio: GPIO used to enable the device
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* @stop_gpio: GPIO used to stop the device
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* @irq_gpio: GPIO used for interrupt (if @irq is not used)
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* @irq: IRQ used for interrupt (if @irq_gpio is not used)
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* @hid: _HID value for device (required)
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* @uid: _UID value for device
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* @desc: _DDN value for device
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* @wake: Wake event, e.g. GPE0_DW1_15; 0 if none
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* @property_count: Number of other DSD properties (currently always 0)
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* @probed: true set set 'linux,probed' property
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* @compat_string: Device tree compatible string to report through ACPI
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* @has_power_resource: true if this device has a power resource
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* @reset_delay_ms: Delay after de-asserting reset, in ms
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* @reset_off_delay_ms: Delay after asserting reset (during power off)
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* @enable_delay_ms: Delay after asserting enable
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* @enable_off_delay_ms: Delay after de-asserting enable (during power off)
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* @stop_delay_ms: Delay after de-aserting stop
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* @stop_off_delay_ms: Delay after asserting stop (during power off)
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* @hid_desc_reg_offset: HID register offset (for Human Interface Devices)
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*/
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struct acpi_i2c_priv {
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bool disable_gpio_export_in_crs;
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struct gpio_desc reset_gpio;
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struct gpio_desc enable_gpio;
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struct gpio_desc irq_gpio;
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struct gpio_desc stop_gpio;
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struct irq irq;
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const char *hid;
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u32 uid;
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const char *desc;
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u32 wake;
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u32 property_count;
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bool probed;
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const char *compat_string;
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bool has_power_resource;
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u32 reset_delay_ms;
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u32 reset_off_delay_ms;
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u32 enable_delay_ms;
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u32 enable_off_delay_ms;
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u32 stop_delay_ms;
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u32 stop_off_delay_ms;
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u32 hid_desc_reg_offset;
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};
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/**
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* acpi_device_path() - Get the full path to an ACPI device
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*
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@ -58,6 +58,12 @@ enum i2c_address_mode {
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I2C_MODE_10_BIT
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};
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/** enum i2c_device_t - Types of I2C devices, used for compatible strings */
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enum i2c_device_t {
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I2C_DEVICE_GENERIC,
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I2C_DEVICE_HID_OVER_I2C,
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};
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||||
struct udevice;
|
||||
/**
|
||||
* struct dm_i2c_chip - information about an i2c chip
|
||||
|
|
@ -558,6 +564,23 @@ int i2c_emul_find(struct udevice *dev, struct udevice **emulp);
|
|||
*/
|
||||
struct udevice *i2c_emul_get_device(struct udevice *emul);
|
||||
|
||||
/* ACPI operations for generic I2C devices */
|
||||
extern struct acpi_ops i2c_acpi_ops;
|
||||
|
||||
/**
|
||||
* acpi_i2c_ofdata_to_platdata() - Read properties intended for ACPI
|
||||
*
|
||||
* This reads the generic I2C properties from the device tree, so that these
|
||||
* can be used to create ACPI information for the device.
|
||||
*
|
||||
* See the i2c/generic-acpi.txt binding file for information about the
|
||||
* properties.
|
||||
*
|
||||
* @dev: I2C device to process
|
||||
* @return 0 if OK, -EINVAL if acpi,hid is not present
|
||||
*/
|
||||
int acpi_i2c_ofdata_to_platdata(struct udevice *dev);
|
||||
|
||||
#ifndef CONFIG_DM_I2C
|
||||
|
||||
/*
|
||||
|
|
|
|||
Loading…
Reference in New Issue