diff options
author | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2016-07-13 16:06:00 (GMT) |
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committer | Jiri Kosina <jkosina@suse.cz> | 2016-08-05 11:39:15 (GMT) |
commit | a50aac7193f18a5a997588556f1212b0d1ba029b (patch) | |
tree | 1132bcbeec19d5d9b19aa5baf80346c2c179d100 /drivers/hid/wacom_sys.c | |
parent | 1c817c83e8ccea5f710d3c0d38edcfd362654ba2 (diff) | |
download | linux-a50aac7193f18a5a997588556f1212b0d1ba029b.tar.xz |
HID: wacom: leds: dynamically allocate LED groups
We need to add an action to ensure wacom->led.groups is null when
wacom_led_control() gets called after the resources has been freed.
This also prevents to send a LED command when there is no support
from the device.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/wacom_sys.c')
-rw-r--r-- | drivers/hid/wacom_sys.c | 85 |
1 files changed, 71 insertions, 14 deletions
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c index d0f5764..4d4c737 100644 --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -647,6 +647,9 @@ static int wacom_led_control(struct wacom *wacom) unsigned char report_id = WAC_CMD_LED_CONTROL; int buf_size = 9; + if (!wacom->led.groups) + return -ENOTSUPP; + if (wacom->wacom_wac.pid) { /* wireless connected */ report_id = WAC_CMD_WL_LED_CONTROL; buf_size = 13; @@ -662,7 +665,7 @@ static int wacom_led_control(struct wacom *wacom) * one of four values: * 0 = Low; 1 = Medium; 2 = High; 3 = Off */ - int ring_led = wacom->led.select[0] & 0x03; + int ring_led = wacom->led.groups[0].select & 0x03; int ring_lum = (((wacom->led.llv & 0x60) >> 5) - 1) & 0x03; int crop_lum = 0; unsigned char led_bits = (crop_lum << 4) | (ring_lum << 2) | (ring_led); @@ -677,11 +680,11 @@ static int wacom_led_control(struct wacom *wacom) buf[1] = led_bits; } else { - int led = wacom->led.select[0] | 0x4; + int led = wacom->led.groups[0].select | 0x4; if (wacom->wacom_wac.features.type == WACOM_21UX2 || wacom->wacom_wac.features.type == WACOM_24HD) - led |= (wacom->led.select[1] << 4) | 0x40; + led |= (wacom->led.groups[1].select << 4) | 0x40; buf[0] = report_id; buf[1] = led; @@ -753,7 +756,7 @@ static ssize_t wacom_led_select_store(struct device *dev, int set_id, mutex_lock(&wacom->lock); - wacom->led.select[set_id] = id & 0x3; + wacom->led.groups[set_id].select = id & 0x3; err = wacom_led_control(wacom); mutex_unlock(&wacom->lock); @@ -773,7 +776,7 @@ static ssize_t wacom_led##SET_ID##_select_show(struct device *dev, \ struct hid_device *hdev = to_hid_device(dev);\ struct wacom *wacom = hid_get_drvdata(hdev); \ return scnprintf(buf, PAGE_SIZE, "%d\n", \ - wacom->led.select[SET_ID]); \ + wacom->led.groups[SET_ID].select); \ } \ static DEVICE_ATTR(status_led##SET_ID##_select, DEV_ATTR_RW_PERM, \ wacom_led##SET_ID##_select_show, \ @@ -955,6 +958,35 @@ static int wacom_devm_sysfs_create_group(struct wacom *wacom, return 0; } +static void wacom_led_groups_release(void *data) +{ + struct wacom *wacom = data; + + wacom->led.groups = NULL; +} + +static int wacom_led_groups_allocate(struct wacom *wacom, int count) +{ + struct wacom_group_leds *groups; + int error; + + groups = devm_kzalloc(&wacom->hdev->dev, + sizeof(struct wacom_group_leds) * count, + GFP_KERNEL); + if (!groups) + return -ENOMEM; + + error = devm_add_action_or_reset(&wacom->hdev->dev, + wacom_led_groups_release, + wacom); + if (error) + return error; + + wacom->led.groups = groups; + + return 0; +} + static int wacom_initialize_leds(struct wacom *wacom) { int error; @@ -968,23 +1000,34 @@ static int wacom_initialize_leds(struct wacom *wacom) case INTUOS4: case INTUOS4WL: case INTUOS4L: - wacom->led.select[0] = 0; - wacom->led.select[1] = 0; wacom->led.llv = 10; wacom->led.hlv = 20; wacom->led.img_lum = 10; + + error = wacom_led_groups_allocate(wacom, 1); + if (error) { + hid_err(wacom->hdev, + "cannot create leds err: %d\n", error); + return error; + } + error = wacom_devm_sysfs_create_group(wacom, &intuos4_led_attr_group); break; case WACOM_24HD: case WACOM_21UX2: - wacom->led.select[0] = 0; - wacom->led.select[1] = 0; wacom->led.llv = 0; wacom->led.hlv = 0; wacom->led.img_lum = 0; + error = wacom_led_groups_allocate(wacom, 2); + if (error) { + hid_err(wacom->hdev, + "cannot create leds err: %d\n", error); + return error; + } + error = wacom_devm_sysfs_create_group(wacom, &cintiq_led_attr_group); break; @@ -995,16 +1038,30 @@ static int wacom_initialize_leds(struct wacom *wacom) case INTUOSPS: case INTUOSPM: case INTUOSPL: - wacom->led.select[0] = 0; - wacom->led.select[1] = 0; wacom->led.llv = 32; wacom->led.hlv = 0; wacom->led.img_lum = 0; + error = wacom_led_groups_allocate(wacom, 1); + if (error) { + hid_err(wacom->hdev, + "cannot create leds err: %d\n", error); + return error; + } + error = wacom_devm_sysfs_create_group(wacom, &intuos5_led_attr_group); break; + case REMOTE: + error = wacom_led_groups_allocate(wacom, 5); + if (error) { + hid_err(wacom->hdev, + "cannot create leds err: %d\n", error); + return error; + } + return 0; + default: return 0; } @@ -1204,7 +1261,7 @@ static ssize_t wacom_show_remote_mode(struct kobject *kobj, struct wacom *wacom = hid_get_drvdata(hdev); u8 mode; - mode = wacom->led.select[index]; + mode = wacom->led.groups[index].select; if (mode >= 0 && mode < 3) return snprintf(buf, PAGE_SIZE, "%d\n", mode); else @@ -1272,7 +1329,7 @@ void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial) for (i = 0; i < WACOM_MAX_REMOTES; i++) { if (wacom_wac->serial[i] == serial) { wacom_wac->serial[i] = 0; - wacom->led.select[i] = WACOM_STATUS_UNKNOWN; + wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN; if (wacom->remote_group[i].name) { sysfs_remove_group(wacom->remote_dir, &wacom->remote_group[i]); @@ -1369,7 +1426,7 @@ static int wacom_initialize_remote(struct wacom *wacom) } for (i = 0; i < WACOM_MAX_REMOTES; i++) { - wacom->led.select[i] = WACOM_STATUS_UNKNOWN; + wacom->led.groups[i].select = WACOM_STATUS_UNKNOWN; wacom_wac->serial[i] = 0; } |