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Subject[PATCH v3 09/18] gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL
Date
Add support for the GPIO_V2_LINE_SET_VALUES_IOCTL.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
---
drivers/gpio/gpiolib-cdev.c | 67 +++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index d34dad50a048..2f5cc835133c 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -811,6 +811,71 @@ static long line_get_values(struct line *line, void __user *ip)
return 0;
}

+static long line_set_values_locked(struct line *line,
+ struct gpio_v2_line_values *lv)
+{
+ DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX);
+ struct gpio_desc **descs;
+ int ret, i, didx, num_set = 0;
+
+ bitmap_zero(vals, GPIO_V2_LINES_MAX);
+ for (i = 0; i < line->num_descs; i++) {
+ if (lv->mask & BIT_ULL(i)) {
+ if (!test_bit(FLAG_IS_OUT, &line->descs[i]->flags))
+ return -EPERM;
+ if (lv->bits & BIT_ULL(i))
+ __set_bit(num_set, vals);
+ num_set++;
+ }
+ }
+ if (num_set == 0)
+ return -EINVAL;
+
+ if (num_set == line->num_descs)
+ /* Reuse the array setting function */
+ return gpiod_set_array_value_complex(false,
+ true,
+ line->num_descs,
+ line->descs,
+ NULL,
+ vals);
+
+ /* build compacted desc array and values */
+ descs = kmalloc_array(num_set, sizeof(*descs), GFP_KERNEL);
+ for (didx = 0, i = 0; i < line->num_descs; i++) {
+ if (lv->mask & BIT_ULL(i)) {
+ descs[didx] = line->descs[i];
+ didx++;
+ }
+ }
+ ret = gpiod_set_array_value_complex(false,
+ true,
+ num_set,
+ descs,
+ NULL,
+ vals);
+
+ kfree(descs);
+ return ret;
+}
+
+static long line_set_values(struct line *line, void __user *ip)
+{
+ struct gpio_v2_line_values lv;
+ int ret;
+
+ if (copy_from_user(&lv, ip, sizeof(lv)))
+ return -EFAULT;
+
+ mutex_lock(&line->config_mutex);
+
+ ret = line_set_values_locked(line, &lv);
+
+ mutex_unlock(&line->config_mutex);
+
+ return ret;
+}
+
static long line_set_config_locked(struct line *line,
struct gpio_v2_line_config *lc)
{
@@ -880,6 +945,8 @@ static long line_ioctl(struct file *file, unsigned int cmd,

if (cmd == GPIO_V2_LINE_GET_VALUES_IOCTL)
return line_get_values(line, ip);
+ else if (cmd == GPIO_V2_LINE_SET_VALUES_IOCTL)
+ return line_set_values(line, ip);
else if (cmd == GPIO_V2_LINE_SET_CONFIG_IOCTL)
return line_set_config(line, ip);

--
2.28.0
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