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authorKent Gibson2020-09-28 08:27:58 +0800
committerBartosz Golaszewski2020-09-30 10:57:02 +0200
commit7b8e00d981680ddbbdd9874a7b46e0da58a2da4b (patch)
treef7cae120e6b5b746728d1f21d7dd5f183aba37c0 /drivers/gpio
parenta54756cb24eafac70ce92bfbd9bb4a4195689fb4 (diff)
gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib-cdev.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 608cdbd1d579..25536aae3e18 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -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);