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-rw-r--r--drivers/i2c/busses/i2c-i801.c37
-rw-r--r--drivers/i2c/muxes/i2c-mux-gpio.c116
2 files changed, 60 insertions, 93 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 679c6c41f64b..bf484cd775ec 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -107,7 +107,7 @@
#include <linux/pm_runtime.h>
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
-#include <linux/gpio.h>
+#include <linux/gpio/machine.h>
#include <linux/platform_data/i2c-mux-gpio.h>
#endif
@@ -274,6 +274,7 @@ struct i801_priv {
#if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
const struct i801_mux_config *mux_drvdata;
struct platform_device *mux_pdev;
+ struct gpiod_lookup_table *lookup;
#endif
struct platform_device *tco_pdev;
@@ -1258,7 +1259,8 @@ static int i801_add_mux(struct i801_priv *priv)
struct device *dev = &priv->adapter.dev;
const struct i801_mux_config *mux_config;
struct i2c_mux_gpio_platform_data gpio_data;
- int err;
+ struct gpiod_lookup_table *lookup;
+ int err, i;
if (!priv->mux_drvdata)
return 0;
@@ -1270,17 +1272,36 @@ static int i801_add_mux(struct i801_priv *priv)
gpio_data.values = mux_config->values;
gpio_data.n_values = mux_config->n_values;
gpio_data.classes = mux_config->classes;
- gpio_data.gpio_chip = mux_config->gpio_chip;
- gpio_data.gpios = mux_config->gpios;
- gpio_data.n_gpios = mux_config->n_gpios;
gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
- /* Register the mux device */
+ /* Register GPIO descriptor lookup table */
+ lookup = devm_kzalloc(dev,
+ struct_size(lookup, table, mux_config->n_gpios),
+ GFP_KERNEL);
+ if (!lookup)
+ return -ENOMEM;
+ lookup->dev_id = "i2c-mux-gpio";
+ for (i = 0; i < mux_config->n_gpios; i++) {
+ lookup->table[i].chip_label = mux_config->gpio_chip;
+ lookup->table[i].chip_hwnum = mux_config->gpios[i];
+ lookup->table[i].con_id = "mux";
+ }
+ gpiod_add_lookup_table(lookup);
+ priv->lookup = lookup;
+
+ /*
+ * Register the mux device, we use PLATFORM_DEVID_NONE here
+ * because since we are referring to the GPIO chip by name we are
+ * anyways in deep trouble if there is more than one of these
+ * devices, and there should likely only be one platform controller
+ * hub.
+ */
priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
- PLATFORM_DEVID_AUTO, &gpio_data,
+ PLATFORM_DEVID_NONE, &gpio_data,
sizeof(struct i2c_mux_gpio_platform_data));
if (IS_ERR(priv->mux_pdev)) {
err = PTR_ERR(priv->mux_pdev);
+ gpiod_remove_lookup_table(lookup);
priv->mux_pdev = NULL;
dev_err(dev, "Failed to register i2c-mux-gpio device\n");
return err;
@@ -1293,6 +1314,8 @@ static void i801_del_mux(struct i801_priv *priv)
{
if (priv->mux_pdev)
platform_device_unregister(priv->mux_pdev);
+ if (priv->lookup)
+ gpiod_remove_lookup_table(priv->lookup);
}
static unsigned int i801_get_adapter_class(struct i801_priv *priv)
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index 13882a2a4f60..fd482feafb19 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -14,13 +14,14 @@
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/gpio.h>
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+/* FIXME: stop poking around inside gpiolib */
#include "../../gpio/gpiolib.h"
-#include <linux/of_gpio.h>
struct gpiomux {
struct i2c_mux_gpio_platform_data data;
- unsigned gpio_base;
+ int ngpios;
struct gpio_desc **gpios;
};
@@ -30,8 +31,7 @@ static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
values[0] = val;
- gpiod_set_array_value_cansleep(mux->data.n_gpios, mux->gpios, NULL,
- values);
+ gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values);
}
static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
@@ -52,12 +52,6 @@ static int i2c_mux_gpio_deselect(struct i2c_mux_core *muxc, u32 chan)
return 0;
}
-static int match_gpio_chip_by_label(struct gpio_chip *chip,
- void *data)
-{
- return !strcmp(chip->label, data);
-}
-
#ifdef CONFIG_OF
static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
struct platform_device *pdev)
@@ -65,8 +59,8 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
struct device_node *np = pdev->dev.of_node;
struct device_node *adapter_np, *child;
struct i2c_adapter *adapter;
- unsigned *values, *gpios;
- int i = 0, ret;
+ unsigned *values;
+ int i = 0;
if (!np)
return -ENODEV;
@@ -103,29 +97,6 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
if (of_property_read_u32(np, "idle-state", &mux->data.idle))
mux->data.idle = I2C_MUX_GPIO_NO_IDLE;
- mux->data.n_gpios = of_gpio_named_count(np, "mux-gpios");
- if (mux->data.n_gpios < 0) {
- dev_err(&pdev->dev, "Missing mux-gpios property in the DT.\n");
- return -EINVAL;
- }
-
- gpios = devm_kcalloc(&pdev->dev,
- mux->data.n_gpios, sizeof(*mux->data.gpios),
- GFP_KERNEL);
- if (!gpios) {
- dev_err(&pdev->dev, "Cannot allocate gpios array");
- return -ENOMEM;
- }
-
- for (i = 0; i < mux->data.n_gpios; i++) {
- ret = of_get_named_gpio(np, "mux-gpios", i);
- if (ret < 0)
- return ret;
- gpios[i] = ret;
- }
-
- mux->data.gpios = gpios;
-
return 0;
}
#else
@@ -142,8 +113,8 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
struct gpiomux *mux;
struct i2c_adapter *parent;
struct i2c_adapter *root;
- unsigned initial_state, gpio_base;
- int i, ret;
+ unsigned initial_state;
+ int i, ngpios, ret;
mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
@@ -158,29 +129,19 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
sizeof(mux->data));
}
- /*
- * If a GPIO chip name is provided, the GPIO pin numbers provided are
- * relative to its base GPIO number. Otherwise they are absolute.
- */
- if (mux->data.gpio_chip) {
- struct gpio_chip *gpio;
-
- gpio = gpiochip_find(mux->data.gpio_chip,
- match_gpio_chip_by_label);
- if (!gpio)
- return -EPROBE_DEFER;
-
- gpio_base = gpio->base;
- } else {
- gpio_base = 0;
+ ngpios = gpiod_count(&pdev->dev, "mux");
+ if (ngpios <= 0) {
+ dev_err(&pdev->dev, "no valid gpios provided\n");
+ return ngpios ?: -EINVAL;
}
+ mux->ngpios = ngpios;
parent = i2c_get_adapter(mux->data.parent);
if (!parent)
return -EPROBE_DEFER;
muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
- mux->data.n_gpios * sizeof(*mux->gpios), 0,
+ ngpios * sizeof(*mux->gpios), 0,
i2c_mux_gpio_select, NULL);
if (!muxc) {
ret = -ENOMEM;
@@ -194,7 +155,6 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
root = i2c_root_adapter(&parent->dev);
muxc->mux_locked = true;
- mux->gpio_base = gpio_base;
if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {
initial_state = mux->data.idle;
@@ -203,34 +163,28 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
initial_state = mux->data.values[0];
}
- for (i = 0; i < mux->data.n_gpios; i++) {
+ for (i = 0; i < ngpios; i++) {
struct device *gpio_dev;
- struct gpio_desc *gpio_desc;
-
- ret = gpio_request(gpio_base + mux->data.gpios[i], "i2c-mux-gpio");
- if (ret) {
- dev_err(&pdev->dev, "Failed to request GPIO %d\n",
- mux->data.gpios[i]);
- goto err_request_gpio;
+ struct gpio_desc *gpiod;
+ enum gpiod_flags flag;
+
+ if (initial_state & BIT(i))
+ flag = GPIOD_OUT_HIGH;
+ else
+ flag = GPIOD_OUT_LOW;
+ gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag);
+ if (IS_ERR(gpiod)) {
+ ret = PTR_ERR(gpiod);
+ goto alloc_failed;
}
- ret = gpio_direction_output(gpio_base + mux->data.gpios[i],
- initial_state & (1 << i));
- if (ret) {
- dev_err(&pdev->dev,
- "Failed to set direction of GPIO %d to output\n",
- mux->data.gpios[i]);
- i++; /* gpio_request above succeeded, so must free */
- goto err_request_gpio;
- }
-
- gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
- mux->gpios[i] = gpio_desc;
+ mux->gpios[i] = gpiod;
if (!muxc->mux_locked)
continue;
- gpio_dev = &gpio_desc->gdev->dev;
+ /* FIXME: find a proper way to access the GPIO device */
+ gpio_dev = &gpiod->gdev->dev;
muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
}
@@ -253,10 +207,6 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
add_adapter_failed:
i2c_mux_del_adapters(muxc);
- i = mux->data.n_gpios;
-err_request_gpio:
- for (; i > 0; i--)
- gpio_free(gpio_base + mux->data.gpios[i - 1]);
alloc_failed:
i2c_put_adapter(parent);
@@ -266,14 +216,8 @@ alloc_failed:
static int i2c_mux_gpio_remove(struct platform_device *pdev)
{
struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
- struct gpiomux *mux = i2c_mux_priv(muxc);
- int i;
i2c_mux_del_adapters(muxc);
-
- for (i = 0; i < mux->data.n_gpios; i++)
- gpio_free(mux->gpio_base + mux->data.gpios[i]);
-
i2c_put_adapter(muxc->parent);
return 0;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.