diff options
Diffstat (limited to 'drivers/gpio/gpio-sim.c')
| -rw-r--r-- | drivers/gpio/gpio-sim.c | 72 |
1 files changed, 53 insertions, 19 deletions
diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c index a8e5ac95cf..1928209491 100644 --- a/drivers/gpio/gpio-sim.c +++ b/drivers/gpio/gpio-sim.c @@ -12,6 +12,8 @@ #include <linux/completion.h> #include <linux/configfs.h> #include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> #include <linux/gpio/driver.h> #include <linux/gpio/machine.h> #include <linux/idr.h> @@ -30,8 +32,7 @@ #include <linux/string.h> #include <linux/string_helpers.h> #include <linux/sysfs.h> - -#include "gpiolib.h" +#include <linux/types.h> #define GPIO_SIM_NGPIO_MAX 1024 #define GPIO_SIM_PROP_MAX 4 /* Max 3 properties + sentinel. */ @@ -41,6 +42,8 @@ static DEFINE_IDA(gpio_sim_ida); struct gpio_sim_chip { struct gpio_chip gc; + struct device *dev; + unsigned long *request_map; unsigned long *direction_map; unsigned long *value_map; unsigned long *pull_map; @@ -64,16 +67,11 @@ static int gpio_sim_apply_pull(struct gpio_sim_chip *chip, unsigned int offset, int value) { int irq, irq_type, ret; - struct gpio_desc *desc; - struct gpio_chip *gc; - - gc = &chip->gc; - desc = &gc->gpiodev->descs[offset]; guard(mutex)(&chip->lock); - if (test_bit(FLAG_REQUESTED, &desc->flags) && - !test_bit(FLAG_IS_OUT, &desc->flags)) { + if (test_bit(offset, chip->request_map) && + test_bit(offset, chip->direction_map)) { if (value == !!test_bit(offset, chip->value_map)) goto set_pull; @@ -100,8 +98,8 @@ static int gpio_sim_apply_pull(struct gpio_sim_chip *chip, set_value: /* Change the value unless we're actively driving the line. */ - if (!test_bit(FLAG_REQUESTED, &desc->flags) || - !test_bit(FLAG_IS_OUT, &desc->flags)) + if (!test_bit(offset, chip->request_map) || + test_bit(offset, chip->direction_map)) __assign_bit(offset, chip->value_map, value); set_pull: @@ -181,8 +179,8 @@ static int gpio_sim_get_direction(struct gpio_chip *gc, unsigned int offset) return direction ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT; } -static int gpio_sim_set_config(struct gpio_chip *gc, - unsigned int offset, unsigned long config) +static int gpio_sim_set_config(struct gpio_chip *gc, unsigned int offset, + unsigned long config) { struct gpio_sim_chip *chip = gpiochip_get_data(gc); @@ -205,13 +203,25 @@ static int gpio_sim_to_irq(struct gpio_chip *gc, unsigned int offset) return irq_create_mapping(chip->irq_sim, offset); } -static void gpio_sim_free(struct gpio_chip *gc, unsigned int offset) +static int gpio_sim_request(struct gpio_chip *gc, unsigned int offset) { struct gpio_sim_chip *chip = gpiochip_get_data(gc); scoped_guard(mutex, &chip->lock) + __set_bit(offset, chip->request_map); + + return 0; +} + +static void gpio_sim_free(struct gpio_chip *gc, unsigned int offset) +{ + struct gpio_sim_chip *chip = gpiochip_get_data(gc); + + scoped_guard(mutex, &chip->lock) { __assign_bit(offset, chip->value_map, !!test_bit(offset, chip->pull_map)); + __clear_bit(offset, chip->request_map); + } } static ssize_t gpio_sim_sysfs_val_show(struct device *dev, @@ -283,6 +293,13 @@ static void gpio_sim_mutex_destroy(void *data) mutex_destroy(lock); } +static void gpio_sim_put_device(void *data) +{ + struct device *dev = data; + + put_device(dev); +} + static void gpio_sim_dispose_mappings(void *data) { struct gpio_sim_chip *chip = data; @@ -296,7 +313,7 @@ static void gpio_sim_sysfs_remove(void *data) { struct gpio_sim_chip *chip = data; - sysfs_remove_groups(&chip->gc.gpiodev->dev.kobj, chip->attr_groups); + sysfs_remove_groups(&chip->dev->kobj, chip->attr_groups); } static int gpio_sim_setup_sysfs(struct gpio_sim_chip *chip) @@ -353,14 +370,18 @@ static int gpio_sim_setup_sysfs(struct gpio_sim_chip *chip) chip->attr_groups[i] = attr_group; } - ret = sysfs_create_groups(&chip->gc.gpiodev->dev.kobj, - chip->attr_groups); + ret = sysfs_create_groups(&chip->dev->kobj, chip->attr_groups); if (ret) return ret; return devm_add_action_or_reset(dev, gpio_sim_sysfs_remove, chip); } +static int gpio_sim_dev_match_fwnode(struct device *dev, void *data) +{ + return device_match_fwnode(dev, data); +} + static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev) { struct gpio_sim_chip *chip; @@ -388,6 +409,10 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev) if (!chip) return -ENOMEM; + chip->request_map = devm_bitmap_zalloc(dev, num_lines, GFP_KERNEL); + if (!chip->request_map) + return -ENOMEM; + chip->direction_map = devm_bitmap_alloc(dev, num_lines, GFP_KERNEL); if (!chip->direction_map) return -ENOMEM; @@ -433,6 +458,7 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev) gc->get_direction = gpio_sim_get_direction; gc->set_config = gpio_sim_set_config; gc->to_irq = gpio_sim_to_irq; + gc->request = gpio_sim_request; gc->free = gpio_sim_free; gc->can_sleep = true; @@ -440,8 +466,16 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev) if (ret) return ret; - /* Used by sysfs and configfs callbacks. */ - dev_set_drvdata(&gc->gpiodev->dev, chip); + chip->dev = device_find_child(dev, swnode, gpio_sim_dev_match_fwnode); + if (!chip->dev) + return -ENODEV; + + ret = devm_add_action_or_reset(dev, gpio_sim_put_device, chip->dev); + if (ret) + return ret; + + /* Used by sysfs callbacks. */ + dev_set_drvdata(chip->dev, chip); return gpio_sim_setup_sysfs(chip); } |