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gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL

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Add support for the GPIO_V2_LINE_SET_VALUES_IOCTL.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson 2020-09-28 08:27:58 +08:00 committed by Bartosz Golaszewski
parent a54756cb24
commit 7b8e00d981
1 changed files with 61 additions and 0 deletions
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61
drivers/gpio/gpiolib-cdev.c
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@ -816,6 +816,65 @@ static long linereq_get_values(struct linereq *lr, void __user *ip)
return 0;
}
static long linereq_set_values_unlocked(struct linereq *lr,
struct gpio_v2_line_values *lv)
{
DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX);
struct gpio_desc **descs;
unsigned int i, didx, num_set;
int ret;
bitmap_zero(vals, GPIO_V2_LINES_MAX);
for (num_set = 0, i = 0; i < lr->num_lines; i++) {
if (lv->mask & BIT_ULL(i)) {
if (!test_bit(FLAG_IS_OUT, &lr->lines[i].desc->flags))
return -EPERM;
if (lv->bits & BIT_ULL(i))
__set_bit(num_set, vals);
num_set++;
descs = &lr->lines[i].desc;
}
}
if (num_set == 0)
return -EINVAL;
if (num_set != 1) {
/* build compacted desc array and values */
descs = kmalloc_array(num_set, sizeof(*descs), GFP_KERNEL);
if (!descs)
return -ENOMEM;
for (didx = 0, i = 0; i < lr->num_lines; i++) {
if (lv->mask & BIT_ULL(i)) {
descs[didx] = lr->lines[i].desc;
didx++;
}
}
}
ret = gpiod_set_array_value_complex(false, true, num_set,
descs, NULL, vals);
if (num_set != 1)
kfree(descs);
return ret;
}
static long linereq_set_values(struct linereq *lr, void __user *ip)
{
struct gpio_v2_line_values lv;
int ret;
if (copy_from_user(&lv, ip, sizeof(lv)))
return -EFAULT;
mutex_lock(&lr->config_mutex);
ret = linereq_set_values_unlocked(lr, &lv);
mutex_unlock(&lr->config_mutex);
return ret;
}
static long linereq_set_config_unlocked(struct linereq *lr,
struct gpio_v2_line_config *lc)
{
@ -892,6 +951,8 @@ static long linereq_ioctl(struct file *file, unsigned int cmd,
if (cmd == GPIO_V2_LINE_GET_VALUES_IOCTL)
return linereq_get_values(lr, ip);
else if (cmd == GPIO_V2_LINE_SET_VALUES_IOCTL)
return linereq_set_values(lr, ip);
else if (cmd == GPIO_V2_LINE_SET_CONFIG_IOCTL)
return linereq_set_config(lr, ip);