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033d9959ed
Pull workqueue changes from Tejun Heo: "This is workqueue updates for v3.7-rc1. A lot of activities this round including considerable API and behavior cleanups. * delayed_work combines a timer and a work item. The handling of the timer part has always been a bit clunky leading to confusing cancelation API with weird corner-case behaviors. delayed_work is updated to use new IRQ safe timer and cancelation now works as expected. * Another deficiency of delayed_work was lack of the counterpart of mod_timer() which led to cancel+queue combinations or open-coded timer+work usages. mod_delayed_work[_on]() are added. These two delayed_work changes make delayed_work provide interface and behave like timer which is executed with process context. * A work item could be executed concurrently on multiple CPUs, which is rather unintuitive and made flush_work() behavior confusing and half-broken under certain circumstances. This problem doesn't exist for non-reentrant workqueues. While non-reentrancy check isn't free, the overhead is incurred only when a work item bounces across different CPUs and even in simulated pathological scenario the overhead isn't too high. All workqueues are made non-reentrant. This removes the distinction between flush_[delayed_]work() and flush_[delayed_]_work_sync(). The former is now as strong as the latter and the specified work item is guaranteed to have finished execution of any previous queueing on return. * In addition to the various bug fixes, Lai redid and simplified CPU hotplug handling significantly. * Joonsoo introduced system_highpri_wq and used it during CPU hotplug. There are two merge commits - one to pull in IRQ safe timer from tip/timers/core and the other to pull in CPU hotplug fixes from wq/for-3.6-fixes as Lai's hotplug restructuring depended on them." Fixed a number of trivial conflicts, but the more interesting conflicts were silent ones where the deprecated interfaces had been used by new code in the merge window, and thus didn't cause any real data conflicts. Tejun pointed out a few of them, I fixed a couple more. * 'for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (46 commits) workqueue: remove spurious WARN_ON_ONCE(in_irq()) from try_to_grab_pending() workqueue: use cwq_set_max_active() helper for workqueue_set_max_active() workqueue: introduce cwq_set_max_active() helper for thaw_workqueues() workqueue: remove @delayed from cwq_dec_nr_in_flight() workqueue: fix possible stall on try_to_grab_pending() of a delayed work item workqueue: use hotcpu_notifier() for workqueue_cpu_down_callback() workqueue: use __cpuinit instead of __devinit for cpu callbacks workqueue: rename manager_mutex to assoc_mutex workqueue: WORKER_REBIND is no longer necessary for idle rebinding workqueue: WORKER_REBIND is no longer necessary for busy rebinding workqueue: reimplement idle worker rebinding workqueue: deprecate __cancel_delayed_work() workqueue: reimplement cancel_delayed_work() using try_to_grab_pending() workqueue: use mod_delayed_work() instead of __cancel + queue workqueue: use irqsafe timer for delayed_work workqueue: clean up delayed_work initializers and add missing one workqueue: make deferrable delayed_work initializer names consistent workqueue: cosmetic whitespace updates for macro definitions workqueue: deprecate system_nrt[_freezable]_wq workqueue: deprecate flush[_delayed]_work_sync() ...
616 lines
17 KiB
C
616 lines
17 KiB
C
/***************************************************************************
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* Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org> *
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* *
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* Based on Logitech G13 driver (v0.4) *
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* Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, version 2 of the License. *
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* *
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* This driver is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this software. If not see <http://www.gnu.org/licenses/>. *
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***************************************************************************/
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#include <linux/hid.h>
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#include <linux/vmalloc.h>
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#include "usbhid/usbhid.h"
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#include <linux/usb.h>
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#include <linux/fb.h>
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#include <linux/module.h>
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#include "hid-picolcd.h"
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/* Framebuffer
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*
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* The PicoLCD use a Topway LCD module of 256x64 pixel
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* This display area is tiled over 4 controllers with 8 tiles
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* each. Each tile has 8x64 pixel, each data byte representing
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* a 1-bit wide vertical line of the tile.
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*
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* The display can be updated at a tile granularity.
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*
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* Chip 1 Chip 2 Chip 3 Chip 4
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* +----------------+----------------+----------------+----------------+
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* | Tile 1 | Tile 1 | Tile 1 | Tile 1 |
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* +----------------+----------------+----------------+----------------+
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* | Tile 2 | Tile 2 | Tile 2 | Tile 2 |
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* +----------------+----------------+----------------+----------------+
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* ...
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* +----------------+----------------+----------------+----------------+
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* | Tile 8 | Tile 8 | Tile 8 | Tile 8 |
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* +----------------+----------------+----------------+----------------+
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*/
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#define PICOLCDFB_NAME "picolcdfb"
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#define PICOLCDFB_WIDTH (256)
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#define PICOLCDFB_HEIGHT (64)
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#define PICOLCDFB_SIZE (PICOLCDFB_WIDTH * PICOLCDFB_HEIGHT / 8)
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#define PICOLCDFB_UPDATE_RATE_LIMIT 10
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#define PICOLCDFB_UPDATE_RATE_DEFAULT 2
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/* Framebuffer visual structures */
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static const struct fb_fix_screeninfo picolcdfb_fix = {
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.id = PICOLCDFB_NAME,
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO01,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = PICOLCDFB_WIDTH / 8,
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.accel = FB_ACCEL_NONE,
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};
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static const struct fb_var_screeninfo picolcdfb_var = {
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.xres = PICOLCDFB_WIDTH,
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.yres = PICOLCDFB_HEIGHT,
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.xres_virtual = PICOLCDFB_WIDTH,
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.yres_virtual = PICOLCDFB_HEIGHT,
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.width = 103,
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.height = 26,
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.bits_per_pixel = 1,
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.grayscale = 1,
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.red = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.green = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.blue = {
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.offset = 0,
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.length = 1,
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.msb_right = 0,
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},
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.transp = {
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.offset = 0,
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.length = 0,
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.msb_right = 0,
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},
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};
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/* Send a given tile to PicoLCD */
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static int picolcd_fb_send_tile(struct picolcd_data *data, u8 *vbitmap,
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int chip, int tile)
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{
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struct hid_report *report1, *report2;
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unsigned long flags;
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u8 *tdata;
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int i;
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report1 = picolcd_out_report(REPORT_LCD_CMD_DATA, data->hdev);
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if (!report1 || report1->maxfield != 1)
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return -ENODEV;
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report2 = picolcd_out_report(REPORT_LCD_DATA, data->hdev);
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if (!report2 || report2->maxfield != 1)
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return -ENODEV;
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spin_lock_irqsave(&data->lock, flags);
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if ((data->status & PICOLCD_FAILED)) {
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spin_unlock_irqrestore(&data->lock, flags);
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return -ENODEV;
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}
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hid_set_field(report1->field[0], 0, chip << 2);
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hid_set_field(report1->field[0], 1, 0x02);
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hid_set_field(report1->field[0], 2, 0x00);
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hid_set_field(report1->field[0], 3, 0x00);
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hid_set_field(report1->field[0], 4, 0xb8 | tile);
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hid_set_field(report1->field[0], 5, 0x00);
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hid_set_field(report1->field[0], 6, 0x00);
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hid_set_field(report1->field[0], 7, 0x40);
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hid_set_field(report1->field[0], 8, 0x00);
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hid_set_field(report1->field[0], 9, 0x00);
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hid_set_field(report1->field[0], 10, 32);
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hid_set_field(report2->field[0], 0, (chip << 2) | 0x01);
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hid_set_field(report2->field[0], 1, 0x00);
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hid_set_field(report2->field[0], 2, 0x00);
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hid_set_field(report2->field[0], 3, 32);
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tdata = vbitmap + (tile * 4 + chip) * 64;
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for (i = 0; i < 64; i++)
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if (i < 32)
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hid_set_field(report1->field[0], 11 + i, tdata[i]);
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else
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hid_set_field(report2->field[0], 4 + i - 32, tdata[i]);
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usbhid_submit_report(data->hdev, report1, USB_DIR_OUT);
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usbhid_submit_report(data->hdev, report2, USB_DIR_OUT);
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spin_unlock_irqrestore(&data->lock, flags);
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return 0;
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}
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/* Translate a single tile*/
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static int picolcd_fb_update_tile(u8 *vbitmap, const u8 *bitmap, int bpp,
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int chip, int tile)
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{
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int i, b, changed = 0;
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u8 tdata[64];
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u8 *vdata = vbitmap + (tile * 4 + chip) * 64;
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if (bpp == 1) {
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for (b = 7; b >= 0; b--) {
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const u8 *bdata = bitmap + tile * 256 + chip * 8 + b * 32;
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for (i = 0; i < 64; i++) {
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tdata[i] <<= 1;
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tdata[i] |= (bdata[i/8] >> (i % 8)) & 0x01;
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}
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}
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} else if (bpp == 8) {
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for (b = 7; b >= 0; b--) {
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const u8 *bdata = bitmap + (tile * 256 + chip * 8 + b * 32) * 8;
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for (i = 0; i < 64; i++) {
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tdata[i] <<= 1;
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tdata[i] |= (bdata[i] & 0x80) ? 0x01 : 0x00;
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}
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}
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} else {
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/* Oops, we should never get here! */
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WARN_ON(1);
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return 0;
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}
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for (i = 0; i < 64; i++)
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if (tdata[i] != vdata[i]) {
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changed = 1;
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vdata[i] = tdata[i];
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}
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return changed;
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}
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void picolcd_fb_refresh(struct picolcd_data *data)
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{
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if (data->fb_info)
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schedule_delayed_work(&data->fb_info->deferred_work, 0);
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}
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/* Reconfigure LCD display */
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int picolcd_fb_reset(struct picolcd_data *data, int clear)
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{
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struct hid_report *report = picolcd_out_report(REPORT_LCD_CMD, data->hdev);
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struct picolcd_fb_data *fbdata = data->fb_info->par;
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int i, j;
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unsigned long flags;
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static const u8 mapcmd[8] = { 0x00, 0x02, 0x00, 0x64, 0x3f, 0x00, 0x64, 0xc0 };
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if (!report || report->maxfield != 1)
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return -ENODEV;
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spin_lock_irqsave(&data->lock, flags);
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for (i = 0; i < 4; i++) {
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for (j = 0; j < report->field[0]->maxusage; j++)
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if (j == 0)
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hid_set_field(report->field[0], j, i << 2);
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else if (j < sizeof(mapcmd))
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hid_set_field(report->field[0], j, mapcmd[j]);
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else
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hid_set_field(report->field[0], j, 0);
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usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
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}
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spin_unlock_irqrestore(&data->lock, flags);
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if (clear) {
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memset(fbdata->vbitmap, 0, PICOLCDFB_SIZE);
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memset(fbdata->bitmap, 0, PICOLCDFB_SIZE*fbdata->bpp);
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}
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fbdata->force = 1;
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/* schedule first output of framebuffer */
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if (fbdata->ready)
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schedule_delayed_work(&data->fb_info->deferred_work, 0);
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else
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fbdata->ready = 1;
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return 0;
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}
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/* Update fb_vbitmap from the screen_base and send changed tiles to device */
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static void picolcd_fb_update(struct fb_info *info)
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{
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int chip, tile, n;
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unsigned long flags;
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struct picolcd_fb_data *fbdata = info->par;
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struct picolcd_data *data;
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mutex_lock(&info->lock);
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spin_lock_irqsave(&fbdata->lock, flags);
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if (!fbdata->ready && fbdata->picolcd)
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picolcd_fb_reset(fbdata->picolcd, 0);
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spin_unlock_irqrestore(&fbdata->lock, flags);
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/*
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* Translate the framebuffer into the format needed by the PicoLCD.
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* See display layout above.
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* Do this one tile after the other and push those tiles that changed.
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*
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* Wait for our IO to complete as otherwise we might flood the queue!
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*/
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n = 0;
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for (chip = 0; chip < 4; chip++)
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for (tile = 0; tile < 8; tile++) {
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if (!fbdata->force && !picolcd_fb_update_tile(
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fbdata->vbitmap, fbdata->bitmap,
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fbdata->bpp, chip, tile))
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continue;
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n += 2;
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if (n >= HID_OUTPUT_FIFO_SIZE / 2) {
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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mutex_unlock(&info->lock);
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if (!data)
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return;
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usbhid_wait_io(data->hdev);
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mutex_lock(&info->lock);
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n = 0;
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}
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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if (!data || picolcd_fb_send_tile(data,
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fbdata->vbitmap, chip, tile))
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goto out;
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}
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fbdata->force = false;
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if (n) {
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spin_lock_irqsave(&fbdata->lock, flags);
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data = fbdata->picolcd;
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spin_unlock_irqrestore(&fbdata->lock, flags);
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mutex_unlock(&info->lock);
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if (data)
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usbhid_wait_io(data->hdev);
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return;
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}
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out:
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mutex_unlock(&info->lock);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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if (!info->par)
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return;
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sys_fillrect(info, rect);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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if (!info->par)
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return;
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sys_copyarea(info, area);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/* Stub to call the system default and update the image on the picoLCD */
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static void picolcd_fb_imageblit(struct fb_info *info, const struct fb_image *image)
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{
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if (!info->par)
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return;
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sys_imageblit(info, image);
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schedule_delayed_work(&info->deferred_work, 0);
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}
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/*
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* this is the slow path from userspace. they can seek and write to
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* the fb. it's inefficient to do anything less than a full screen draw
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*/
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static ssize_t picolcd_fb_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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if (!info->par)
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return -ENODEV;
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ret = fb_sys_write(info, buf, count, ppos);
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if (ret >= 0)
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schedule_delayed_work(&info->deferred_work, 0);
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return ret;
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}
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static int picolcd_fb_blank(int blank, struct fb_info *info)
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{
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/* We let fb notification do this for us via lcd/backlight device */
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return 0;
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}
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static void picolcd_fb_destroy(struct fb_info *info)
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{
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struct picolcd_fb_data *fbdata = info->par;
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/* make sure no work is deferred */
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fb_deferred_io_cleanup(info);
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/* No thridparty should ever unregister our framebuffer! */
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WARN_ON(fbdata->picolcd != NULL);
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vfree((u8 *)info->fix.smem_start);
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framebuffer_release(info);
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}
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static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
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{
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__u32 bpp = var->bits_per_pixel;
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__u32 activate = var->activate;
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/* only allow 1/8 bit depth (8-bit is grayscale) */
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*var = picolcdfb_var;
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var->activate = activate;
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if (bpp >= 8) {
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var->bits_per_pixel = 8;
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var->red.length = 8;
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var->green.length = 8;
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var->blue.length = 8;
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} else {
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var->bits_per_pixel = 1;
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var->red.length = 1;
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var->green.length = 1;
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var->blue.length = 1;
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}
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return 0;
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}
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static int picolcd_set_par(struct fb_info *info)
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{
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struct picolcd_fb_data *fbdata = info->par;
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u8 *tmp_fb, *o_fb;
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if (info->var.bits_per_pixel == fbdata->bpp)
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return 0;
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/* switch between 1/8 bit depths */
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if (info->var.bits_per_pixel != 1 && info->var.bits_per_pixel != 8)
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return -EINVAL;
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o_fb = fbdata->bitmap;
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tmp_fb = kmalloc(PICOLCDFB_SIZE*info->var.bits_per_pixel, GFP_KERNEL);
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if (!tmp_fb)
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return -ENOMEM;
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/* translate FB content to new bits-per-pixel */
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if (info->var.bits_per_pixel == 1) {
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int i, b;
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for (i = 0; i < PICOLCDFB_SIZE; i++) {
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u8 p = 0;
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for (b = 0; b < 8; b++) {
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p <<= 1;
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p |= o_fb[i*8+b] ? 0x01 : 0x00;
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}
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tmp_fb[i] = p;
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}
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memcpy(o_fb, tmp_fb, PICOLCDFB_SIZE);
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info->fix.visual = FB_VISUAL_MONO01;
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info->fix.line_length = PICOLCDFB_WIDTH / 8;
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} else {
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int i;
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memcpy(tmp_fb, o_fb, PICOLCDFB_SIZE);
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for (i = 0; i < PICOLCDFB_SIZE * 8; i++)
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o_fb[i] = tmp_fb[i/8] & (0x01 << (7 - i % 8)) ? 0xff : 0x00;
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info->fix.visual = FB_VISUAL_DIRECTCOLOR;
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info->fix.line_length = PICOLCDFB_WIDTH;
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}
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|
|
kfree(tmp_fb);
|
|
fbdata->bpp = info->var.bits_per_pixel;
|
|
return 0;
|
|
}
|
|
|
|
/* Note this can't be const because of struct fb_info definition */
|
|
static struct fb_ops picolcdfb_ops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_destroy = picolcd_fb_destroy,
|
|
.fb_read = fb_sys_read,
|
|
.fb_write = picolcd_fb_write,
|
|
.fb_blank = picolcd_fb_blank,
|
|
.fb_fillrect = picolcd_fb_fillrect,
|
|
.fb_copyarea = picolcd_fb_copyarea,
|
|
.fb_imageblit = picolcd_fb_imageblit,
|
|
.fb_check_var = picolcd_fb_check_var,
|
|
.fb_set_par = picolcd_set_par,
|
|
};
|
|
|
|
|
|
/* Callback from deferred IO workqueue */
|
|
static void picolcd_fb_deferred_io(struct fb_info *info, struct list_head *pagelist)
|
|
{
|
|
picolcd_fb_update(info);
|
|
}
|
|
|
|
static const struct fb_deferred_io picolcd_fb_defio = {
|
|
.delay = HZ / PICOLCDFB_UPDATE_RATE_DEFAULT,
|
|
.deferred_io = picolcd_fb_deferred_io,
|
|
};
|
|
|
|
|
|
/*
|
|
* The "fb_update_rate" sysfs attribute
|
|
*/
|
|
static ssize_t picolcd_fb_update_rate_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct picolcd_data *data = dev_get_drvdata(dev);
|
|
struct picolcd_fb_data *fbdata = data->fb_info->par;
|
|
unsigned i, fb_update_rate = fbdata->update_rate;
|
|
size_t ret = 0;
|
|
|
|
for (i = 1; i <= PICOLCDFB_UPDATE_RATE_LIMIT; i++)
|
|
if (ret >= PAGE_SIZE)
|
|
break;
|
|
else if (i == fb_update_rate)
|
|
ret += snprintf(buf+ret, PAGE_SIZE-ret, "[%u] ", i);
|
|
else
|
|
ret += snprintf(buf+ret, PAGE_SIZE-ret, "%u ", i);
|
|
if (ret > 0)
|
|
buf[min(ret, (size_t)PAGE_SIZE)-1] = '\n';
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t picolcd_fb_update_rate_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct picolcd_data *data = dev_get_drvdata(dev);
|
|
struct picolcd_fb_data *fbdata = data->fb_info->par;
|
|
int i;
|
|
unsigned u;
|
|
|
|
if (count < 1 || count > 10)
|
|
return -EINVAL;
|
|
|
|
i = sscanf(buf, "%u", &u);
|
|
if (i != 1)
|
|
return -EINVAL;
|
|
|
|
if (u > PICOLCDFB_UPDATE_RATE_LIMIT)
|
|
return -ERANGE;
|
|
else if (u == 0)
|
|
u = PICOLCDFB_UPDATE_RATE_DEFAULT;
|
|
|
|
fbdata->update_rate = u;
|
|
data->fb_info->fbdefio->delay = HZ / fbdata->update_rate;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(fb_update_rate, 0666, picolcd_fb_update_rate_show,
|
|
picolcd_fb_update_rate_store);
|
|
|
|
/* initialize Framebuffer device */
|
|
int picolcd_init_framebuffer(struct picolcd_data *data)
|
|
{
|
|
struct device *dev = &data->hdev->dev;
|
|
struct fb_info *info = NULL;
|
|
struct picolcd_fb_data *fbdata = NULL;
|
|
int i, error = -ENOMEM;
|
|
u32 *palette;
|
|
|
|
/* The extra memory is:
|
|
* - 256*u32 for pseudo_palette
|
|
* - struct fb_deferred_io
|
|
*/
|
|
info = framebuffer_alloc(256 * sizeof(u32) +
|
|
sizeof(struct fb_deferred_io) +
|
|
sizeof(struct picolcd_fb_data) +
|
|
PICOLCDFB_SIZE, dev);
|
|
if (info == NULL) {
|
|
dev_err(dev, "failed to allocate a framebuffer\n");
|
|
goto err_nomem;
|
|
}
|
|
|
|
info->fbdefio = info->par;
|
|
*info->fbdefio = picolcd_fb_defio;
|
|
info->par += sizeof(struct fb_deferred_io);
|
|
palette = info->par;
|
|
info->par += 256 * sizeof(u32);
|
|
for (i = 0; i < 256; i++)
|
|
palette[i] = i > 0 && i < 16 ? 0xff : 0;
|
|
info->pseudo_palette = palette;
|
|
info->fbops = &picolcdfb_ops;
|
|
info->var = picolcdfb_var;
|
|
info->fix = picolcdfb_fix;
|
|
info->fix.smem_len = PICOLCDFB_SIZE*8;
|
|
info->flags = FBINFO_FLAG_DEFAULT;
|
|
|
|
fbdata = info->par;
|
|
spin_lock_init(&fbdata->lock);
|
|
fbdata->picolcd = data;
|
|
fbdata->update_rate = PICOLCDFB_UPDATE_RATE_DEFAULT;
|
|
fbdata->bpp = picolcdfb_var.bits_per_pixel;
|
|
fbdata->force = 1;
|
|
fbdata->vbitmap = info->par + sizeof(struct picolcd_fb_data);
|
|
fbdata->bitmap = vmalloc(PICOLCDFB_SIZE*8);
|
|
if (fbdata->bitmap == NULL) {
|
|
dev_err(dev, "can't get a free page for framebuffer\n");
|
|
goto err_nomem;
|
|
}
|
|
info->screen_base = (char __force __iomem *)fbdata->bitmap;
|
|
info->fix.smem_start = (unsigned long)fbdata->bitmap;
|
|
memset(fbdata->vbitmap, 0xff, PICOLCDFB_SIZE);
|
|
data->fb_info = info;
|
|
|
|
error = picolcd_fb_reset(data, 1);
|
|
if (error) {
|
|
dev_err(dev, "failed to configure display\n");
|
|
goto err_cleanup;
|
|
}
|
|
|
|
error = device_create_file(dev, &dev_attr_fb_update_rate);
|
|
if (error) {
|
|
dev_err(dev, "failed to create sysfs attributes\n");
|
|
goto err_cleanup;
|
|
}
|
|
|
|
fb_deferred_io_init(info);
|
|
error = register_framebuffer(info);
|
|
if (error) {
|
|
dev_err(dev, "failed to register framebuffer\n");
|
|
goto err_sysfs;
|
|
}
|
|
return 0;
|
|
|
|
err_sysfs:
|
|
device_remove_file(dev, &dev_attr_fb_update_rate);
|
|
fb_deferred_io_cleanup(info);
|
|
err_cleanup:
|
|
data->fb_info = NULL;
|
|
|
|
err_nomem:
|
|
if (fbdata)
|
|
vfree(fbdata->bitmap);
|
|
framebuffer_release(info);
|
|
return error;
|
|
}
|
|
|
|
void picolcd_exit_framebuffer(struct picolcd_data *data)
|
|
{
|
|
struct fb_info *info = data->fb_info;
|
|
struct picolcd_fb_data *fbdata = info->par;
|
|
unsigned long flags;
|
|
|
|
device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate);
|
|
|
|
/* disconnect framebuffer from HID dev */
|
|
spin_lock_irqsave(&fbdata->lock, flags);
|
|
fbdata->picolcd = NULL;
|
|
spin_unlock_irqrestore(&fbdata->lock, flags);
|
|
|
|
/* make sure there is no running update - thus that fbdata->picolcd
|
|
* once obtained under lock is guaranteed not to get free() under
|
|
* the feet of the deferred work */
|
|
flush_delayed_work(&info->deferred_work);
|
|
|
|
data->fb_info = NULL;
|
|
unregister_framebuffer(info);
|
|
}
|