#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
if (bri->prepare_recovery)
bri->prepare_recovery(adap);
+ if (bri->pinctrl)
+ pinctrl_select_state(bri->pinctrl, bri->pins_gpio);
/*
* If we can set SDA, we will always create a STOP to ensure additional
if (bri->unprepare_recovery)
bri->unprepare_recovery(adap);
+ if (bri->pinctrl)
+ pinctrl_select_state(bri->pinctrl, bri->pins_default);
return ret;
}
}
EXPORT_SYMBOL_GPL(i2c_recover_bus);
-static void i2c_init_recovery(struct i2c_adapter *adap)
+static void i2c_gpio_init_pinctrl_recovery(struct i2c_adapter *adap)
+{
+ struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
+ struct device *dev = &adap->dev;
+ struct pinctrl *p = bri->pinctrl;
+
+ /*
+ * we can't change states without pinctrl, so remove the states if
+ * populated
+ */
+ if (!p) {
+ bri->pins_default = NULL;
+ bri->pins_gpio = NULL;
+ return;
+ }
+
+ if (!bri->pins_default) {
+ bri->pins_default = pinctrl_lookup_state(p,
+ PINCTRL_STATE_DEFAULT);
+ if (IS_ERR(bri->pins_default)) {
+ dev_dbg(dev, PINCTRL_STATE_DEFAULT " state not found for GPIO recovery\n");
+ bri->pins_default = NULL;
+ }
+ }
+ if (!bri->pins_gpio) {
+ bri->pins_gpio = pinctrl_lookup_state(p, "gpio");
+ if (IS_ERR(bri->pins_gpio))
+ bri->pins_gpio = pinctrl_lookup_state(p, "recovery");
+
+ if (IS_ERR(bri->pins_gpio)) {
+ dev_dbg(dev, "no gpio or recovery state found for GPIO recovery\n");
+ bri->pins_gpio = NULL;
+ }
+ }
+
+ /* for pinctrl state changes, we need all the information */
+ if (bri->pins_default && bri->pins_gpio) {
+ dev_info(dev, "using pinctrl states for GPIO recovery");
+ } else {
+ bri->pinctrl = NULL;
+ bri->pins_default = NULL;
+ bri->pins_gpio = NULL;
+ }
+}
+
+static int i2c_gpio_init_generic_recovery(struct i2c_adapter *adap)
+{
+ struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
+ struct device *dev = &adap->dev;
+ struct gpio_desc *gpiod;
+ int ret = 0;
+
+ /*
+ * don't touch the recovery information if the driver is not using
+ * generic SCL recovery
+ */
+ if (bri->recover_bus && bri->recover_bus != i2c_generic_scl_recovery)
+ return 0;
+
+ /*
+ * pins might be taken as GPIO, so we should inform pinctrl about
+ * this and move the state to GPIO
+ */
+ if (bri->pinctrl)
+ pinctrl_select_state(bri->pinctrl, bri->pins_gpio);
+
+ /*
+ * if there is incomplete or no recovery information, see if generic
+ * GPIO recovery is available
+ */
+ if (!bri->scl_gpiod) {
+ gpiod = devm_gpiod_get(dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN);
+ if (PTR_ERR(gpiod) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto cleanup_pinctrl_state;
+ }
+ if (!IS_ERR(gpiod)) {
+ bri->scl_gpiod = gpiod;
+ bri->recover_bus = i2c_generic_scl_recovery;
+ dev_info(dev, "using generic GPIOs for recovery\n");
+ }
+ }
+
+ /* SDA GPIOD line is optional, so we care about DEFER only */
+ if (!bri->sda_gpiod) {
+ /*
+ * We have SCL. Pull SCL low and wait a bit so that SDA glitches
+ * have no effect.
+ */
+ gpiod_direction_output(bri->scl_gpiod, 0);
+ udelay(10);
+ gpiod = devm_gpiod_get(dev, "sda", GPIOD_IN);
+
+ /* Wait a bit in case of a SDA glitch, and then release SCL. */
+ udelay(10);
+ gpiod_direction_output(bri->scl_gpiod, 1);
+
+ if (PTR_ERR(gpiod) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto cleanup_pinctrl_state;
+ }
+ if (!IS_ERR(gpiod))
+ bri->sda_gpiod = gpiod;
+ }
+
+cleanup_pinctrl_state:
+ /* change the state of the pins back to their default state */
+ if (bri->pinctrl)
+ pinctrl_select_state(bri->pinctrl, bri->pins_default);
+
+ return ret;
+}
+
+static int i2c_gpio_init_recovery(struct i2c_adapter *adap)
+{
+ i2c_gpio_init_pinctrl_recovery(adap);
+ return i2c_gpio_init_generic_recovery(adap);
+}
+
+static int i2c_init_recovery(struct i2c_adapter *adap)
{
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
char *err_str;
if (!bri)
- return;
+ return 0;
+
+ if (i2c_gpio_init_recovery(adap) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
if (!bri->recover_bus) {
err_str = "no recover_bus() found";
if (gpiod_get_direction(bri->sda_gpiod) == 0)
bri->set_sda = set_sda_gpio_value;
}
- return;
- }
-
- if (bri->recover_bus == i2c_generic_scl_recovery) {
+ } else if (bri->recover_bus == i2c_generic_scl_recovery) {
/* Generic SCL recovery */
if (!bri->set_scl || !bri->get_scl) {
err_str = "no {get|set}_scl() found";
}
}
- return;
+ return 0;
err:
dev_err(&adap->dev, "Not using recovery: %s\n", err_str);
adap->bus_recovery_info = NULL;
+
+ return -EINVAL;
}
static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client)
if (!client)
return 0;
- driver = to_i2c_driver(dev->driver);
-
client->irq = client->init_irq;
- if (!client->irq && !driver->disable_i2c_core_irq_mapping) {
+ if (!client->irq) {
int irq = -ENOENT;
if (client->flags & I2C_CLIENT_HOST_NOTIFY) {
client->irq = irq;
}
+ driver = to_i2c_driver(dev->driver);
+
/*
* An I2C ID table is not mandatory, if and only if, a suitable OF
* or ACPI ID table is supplied for the probing device.
*/
if (!driver->id_table &&
- !i2c_acpi_match_device(dev->driver->acpi_match_table, client) &&
+ !acpi_driver_match_device(dev, dev->driver) &&
!i2c_of_match_device(dev->driver->of_match_table, client)) {
status = -ENODEV;
goto put_sync_adapter;
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_HOST_NOTIFY))
return 0;
- domain = irq_domain_create_linear(adap->dev.fwnode,
+ domain = irq_domain_create_linear(adap->dev.parent->fwnode,
I2C_ADDR_7BITS_COUNT,
&i2c_host_notify_irq_ops, adap);
if (!domain)
if (res)
goto out_reg;
- dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
-
pm_runtime_no_callbacks(&adap->dev);
pm_suspend_ignore_children(&adap->dev, true);
pm_runtime_enable(&adap->dev);
+ res = i2c_init_recovery(adap);
+ if (res == -EPROBE_DEFER)
+ goto out_reg;
+
+ dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
+
#ifdef CONFIG_I2C_COMPAT
res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
adap->dev.parent);
"Failed to create compatibility class link\n");
#endif
- i2c_init_recovery(adap);
-
/* create pre-declared device nodes */
of_i2c_register_devices(adap);
i2c_acpi_register_devices(adap);
projects / linux-2.6-microblaze.git / blobdiff