diff options
| author | Kent Gibson <warthog618@gmail.com> | 2020-09-28 08:27:58 +0800 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-09-30 10:57:02 +0200 |
| commit | 7b8e00d981680ddbbdd9874a7b46e0da58a2da4b (patch) | |
| tree | f7cae120e6b5b746728d1f21d7dd5f183aba37c0 /drivers/gpio | |
| parent | a54756cb24eafac70ce92bfbd9bb4a4195689fb4 (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.c | 61 |
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); |