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hid-picolcd.c
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/***************************************************************************
* Copyright (C) 2010 by Bruno Prémont <bonbons@linux-vserver.org> *
* *
* Based on Logitech G13 driver (v0.4) *
* Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu> *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, version 2 of the License. *
* *
* This driver is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this software. If not see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#include <linux/hid.h>
#include <linux/hid-debug.h>
#include <linux/input.h>
#include "hid-ids.h"
#include "usbhid/usbhid.h"
#include <linux/usb.h>
#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/leds.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/completion.h>
#include <linux/uaccess.h>
#define PICOLCD_NAME "PicoLCD (graphic)"
/* Report numbers */
#define REPORT_ERROR_CODE 0x10 /* LCD: IN[16] */
#define ERR_SUCCESS 0x00
#define ERR_PARAMETER_MISSING 0x01
#define ERR_DATA_MISSING 0x02
#define ERR_BLOCK_READ_ONLY 0x03
#define ERR_BLOCK_NOT_ERASABLE 0x04
#define ERR_BLOCK_TOO_BIG 0x05
#define ERR_SECTION_OVERFLOW 0x06
#define ERR_INVALID_CMD_LEN 0x07
#define ERR_INVALID_DATA_LEN 0x08
#define REPORT_KEY_STATE 0x11 /* LCD: IN[2] */
#define REPORT_IR_DATA 0x21 /* LCD: IN[63] */
#define REPORT_EE_DATA 0x32 /* LCD: IN[63] */
#define REPORT_MEMORY 0x41 /* LCD: IN[63] */
#define REPORT_LED_STATE 0x81 /* LCD: OUT[1] */
#define REPORT_BRIGHTNESS 0x91 /* LCD: OUT[1] */
#define REPORT_CONTRAST 0x92 /* LCD: OUT[1] */
#define REPORT_RESET 0x93 /* LCD: OUT[2] */
#define REPORT_LCD_CMD 0x94 /* LCD: OUT[63] */
#define REPORT_LCD_DATA 0x95 /* LCD: OUT[63] */
#define REPORT_LCD_CMD_DATA 0x96 /* LCD: OUT[63] */
#define REPORT_EE_READ 0xa3 /* LCD: OUT[63] */
#define REPORT_EE_WRITE 0xa4 /* LCD: OUT[63] */
#define REPORT_ERASE_MEMORY 0xb2 /* LCD: OUT[2] */
#define REPORT_READ_MEMORY 0xb3 /* LCD: OUT[3] */
#define REPORT_WRITE_MEMORY 0xb4 /* LCD: OUT[63] */
#define REPORT_SPLASH_RESTART 0xc1 /* LCD: OUT[1] */
#define REPORT_EXIT_KEYBOARD 0xef /* LCD: OUT[2] */
#define REPORT_VERSION 0xf1 /* LCD: IN[2],OUT[1] Bootloader: IN[2],OUT[1] */
#define REPORT_BL_ERASE_MEMORY 0xf2 /* Bootloader: IN[36],OUT[4] */
#define REPORT_BL_READ_MEMORY 0xf3 /* Bootloader: IN[36],OUT[4] */
#define REPORT_BL_WRITE_MEMORY 0xf4 /* Bootloader: IN[36],OUT[36] */
#define REPORT_DEVID 0xf5 /* LCD: IN[5], OUT[1] Bootloader: IN[5],OUT[1] */
#define REPORT_SPLASH_SIZE 0xf6 /* LCD: IN[4], OUT[1] */
#define REPORT_HOOK_VERSION 0xf7 /* LCD: IN[2], OUT[1] */
#define REPORT_EXIT_FLASHER 0xff /* Bootloader: OUT[2] */
#ifdef CONFIG_HID_PICOLCD_FB
/* Framebuffer
*
* The PicoLCD use a Topway LCD module of 256x64 pixel
* This display area is tiled over 4 controllers with 8 tiles
* each. Each tile has 8x64 pixel, each data byte representing
* a 1-bit wide vertical line of the tile.
*
* The display can be updated at a tile granularity.
*
* Chip 1 Chip 2 Chip 3 Chip 4
* +----------------+----------------+----------------+----------------+
* | Tile 1 | Tile 1 | Tile 1 | Tile 1 |
* +----------------+----------------+----------------+----------------+
* | Tile 2 | Tile 2 | Tile 2 | Tile 2 |
* +----------------+----------------+----------------+----------------+
* ...
* +----------------+----------------+----------------+----------------+
* | Tile 8 | Tile 8 | Tile 8 | Tile 8 |
* +----------------+----------------+----------------+----------------+
*/
#define PICOLCDFB_NAME "picolcdfb"
#define PICOLCDFB_WIDTH (256)
#define PICOLCDFB_HEIGHT (64)
#define PICOLCDFB_SIZE (PICOLCDFB_WIDTH * PICOLCDFB_HEIGHT / 8)
#define PICOLCDFB_UPDATE_RATE_LIMIT 10
#define PICOLCDFB_UPDATE_RATE_DEFAULT 2
/* Framebuffer visual structures */
static const struct fb_fix_screeninfo picolcdfb_fix = {
.id = PICOLCDFB_NAME,
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_MONO01,
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
.line_length = PICOLCDFB_WIDTH / 8,
.accel = FB_ACCEL_NONE,
};
static const struct fb_var_screeninfo picolcdfb_var = {
.xres = PICOLCDFB_WIDTH,
.yres = PICOLCDFB_HEIGHT,
.xres_virtual = PICOLCDFB_WIDTH,
.yres_virtual = PICOLCDFB_HEIGHT,
.width = 103,
.height = 26,
.bits_per_pixel = 1,
.grayscale = 1,
.red = {
.offset = 0,
.length = 1,
.msb_right = 0,
},
.green = {
.offset = 0,
.length = 1,
.msb_right = 0,
},
.blue = {
.offset = 0,
.length = 1,
.msb_right = 0,
},
.transp = {
.offset = 0,
.length = 0,
.msb_right = 0,
},
};
#endif /* CONFIG_HID_PICOLCD_FB */
/* Input device
*
* The PicoLCD has an IR receiver header, a built-in keypad with 5 keys
* and header for 4x4 key matrix. The built-in keys are part of the matrix.
*/
static const unsigned short def_keymap[] = {
KEY_RESERVED, /* none */
KEY_BACK, /* col 4 + row 1 */
KEY_HOMEPAGE, /* col 3 + row 1 */
KEY_RESERVED, /* col 2 + row 1 */
KEY_RESERVED, /* col 1 + row 1 */
KEY_SCROLLUP, /* col 4 + row 2 */
KEY_OK, /* col 3 + row 2 */
KEY_SCROLLDOWN, /* col 2 + row 2 */
KEY_RESERVED, /* col 1 + row 2 */
KEY_RESERVED, /* col 4 + row 3 */
KEY_RESERVED, /* col 3 + row 3 */
KEY_RESERVED, /* col 2 + row 3 */
KEY_RESERVED, /* col 1 + row 3 */
KEY_RESERVED, /* col 4 + row 4 */
KEY_RESERVED, /* col 3 + row 4 */
KEY_RESERVED, /* col 2 + row 4 */
KEY_RESERVED, /* col 1 + row 4 */
};
#define PICOLCD_KEYS ARRAY_SIZE(def_keymap)
/* Description of in-progress IO operation, used for operations
* that trigger response from device */
struct picolcd_pending {
struct hid_report *out_report;
struct hid_report *in_report;
struct completion ready;
int raw_size;
u8 raw_data[64];
};
/* Per device data structure */
struct picolcd_data {
struct hid_device *hdev;
#ifdef CONFIG_DEBUG_FS
struct dentry *debug_reset;
struct dentry *debug_eeprom;
struct dentry *debug_flash;
struct mutex mutex_flash;
int addr_sz;
#endif
u8 version[2];
unsigned short opmode_delay;
/* input stuff */
u8 pressed_keys[2];
struct input_dev *input_keys;
struct input_dev *input_cir;
unsigned short keycode[PICOLCD_KEYS];
#ifdef CONFIG_HID_PICOLCD_FB
/* Framebuffer stuff */
u8 fb_update_rate;
u8 fb_bpp;
u8 fb_force;
u8 *fb_vbitmap; /* local copy of what was sent to PicoLCD */
u8 *fb_bitmap; /* framebuffer */
struct fb_info *fb_info;
struct fb_deferred_io fb_defio;
#endif /* CONFIG_HID_PICOLCD_FB */
#ifdef CONFIG_HID_PICOLCD_LCD
struct lcd_device *lcd;
u8 lcd_contrast;
#endif /* CONFIG_HID_PICOLCD_LCD */
#ifdef CONFIG_HID_PICOLCD_BACKLIGHT
struct backlight_device *backlight;
u8 lcd_brightness;
u8 lcd_power;
#endif /* CONFIG_HID_PICOLCD_BACKLIGHT */
#ifdef CONFIG_HID_PICOLCD_LEDS
/* LED stuff */
u8 led_state;
struct led_classdev *led[8];
#endif /* CONFIG_HID_PICOLCD_LEDS */
/* Housekeeping stuff */
spinlock_t lock;
struct mutex mutex;
struct picolcd_pending *pending;
int status;
#define PICOLCD_BOOTLOADER 1
#define PICOLCD_FAILED 2
#define PICOLCD_READY_FB 4
};
/* Find a given report */
#define picolcd_in_report(id, dev) picolcd_report(id, dev, HID_INPUT_REPORT)
#define picolcd_out_report(id, dev) picolcd_report(id, dev, HID_OUTPUT_REPORT)
static struct hid_report *picolcd_report(int id, struct hid_device *hdev, int dir)
{
struct list_head *feature_report_list = &hdev->report_enum[dir].report_list;
struct hid_report *report = NULL;
list_for_each_entry(report, feature_report_list, list) {
if (report->id == id)
return report;
}
dev_warn(&hdev->dev, "No report with id 0x%x found\n", id);
return NULL;
}
#ifdef CONFIG_DEBUG_FS
static void picolcd_debug_out_report(struct picolcd_data *data,
struct hid_device *hdev, struct hid_report *report);
#define usbhid_submit_report(a, b, c) \
do { \
picolcd_debug_out_report(hid_get_drvdata(a), a, b); \
usbhid_submit_report(a, b, c); \
} while (0)
#endif
/* Submit a report and wait for a reply from device - if device fades away
* or does not respond in time, return NULL */
static struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
int report_id, const u8 *raw_data, int size)
{
struct picolcd_data *data = hid_get_drvdata(hdev);
struct picolcd_pending *work;
struct hid_report *report = picolcd_out_report(report_id, hdev);
unsigned long flags;
int i, j, k;
if (!report || !data)
return NULL;
if (data->status & PICOLCD_FAILED)
return NULL;
work = kzalloc(sizeof(*work), GFP_KERNEL);
if (!work)
return NULL;
init_completion(&work->ready);
work->out_report = report;
work->in_report = NULL;
work->raw_size = 0;
mutex_lock(&data->mutex);
spin_lock_irqsave(&data->lock, flags);
for (i = k = 0; i < report->maxfield; i++)
for (j = 0; j < report->field[i]->report_count; j++) {
hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
k++;
}
data->pending = work;
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
spin_lock_irqsave(&data->lock, flags);
data->pending = NULL;
spin_unlock_irqrestore(&data->lock, flags);
mutex_unlock(&data->mutex);
return work;
}
#ifdef CONFIG_HID_PICOLCD_FB
/* Send a given tile to PicoLCD */
static int picolcd_fb_send_tile(struct hid_device *hdev, int chip, int tile)
{
struct picolcd_data *data = hid_get_drvdata(hdev);
struct hid_report *report1 = picolcd_out_report(REPORT_LCD_CMD_DATA, hdev);
struct hid_report *report2 = picolcd_out_report(REPORT_LCD_DATA, hdev);
unsigned long flags;
u8 *tdata;
int i;
if (!report1 || report1->maxfield != 1 || !report2 || report2->maxfield != 1)
return -ENODEV;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report1->field[0], 0, chip << 2);
hid_set_field(report1->field[0], 1, 0x02);
hid_set_field(report1->field[0], 2, 0x00);
hid_set_field(report1->field[0], 3, 0x00);
hid_set_field(report1->field[0], 4, 0xb8 | tile);
hid_set_field(report1->field[0], 5, 0x00);
hid_set_field(report1->field[0], 6, 0x00);
hid_set_field(report1->field[0], 7, 0x40);
hid_set_field(report1->field[0], 8, 0x00);
hid_set_field(report1->field[0], 9, 0x00);
hid_set_field(report1->field[0], 10, 32);
hid_set_field(report2->field[0], 0, (chip << 2) | 0x01);
hid_set_field(report2->field[0], 1, 0x00);
hid_set_field(report2->field[0], 2, 0x00);
hid_set_field(report2->field[0], 3, 32);
tdata = data->fb_vbitmap + (tile * 4 + chip) * 64;
for (i = 0; i < 64; i++)
if (i < 32)
hid_set_field(report1->field[0], 11 + i, tdata[i]);
else
hid_set_field(report2->field[0], 4 + i - 32, tdata[i]);
usbhid_submit_report(data->hdev, report1, USB_DIR_OUT);
usbhid_submit_report(data->hdev, report2, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
/* Translate a single tile*/
static int picolcd_fb_update_tile(u8 *vbitmap, const u8 *bitmap, int bpp,
int chip, int tile)
{
int i, b, changed = 0;
u8 tdata[64];
u8 *vdata = vbitmap + (tile * 4 + chip) * 64;
if (bpp == 1) {
for (b = 7; b >= 0; b--) {
const u8 *bdata = bitmap + tile * 256 + chip * 8 + b * 32;
for (i = 0; i < 64; i++) {
tdata[i] <<= 1;
tdata[i] |= (bdata[i/8] >> (i % 8)) & 0x01;
}
}
} else if (bpp == 8) {
for (b = 7; b >= 0; b--) {
const u8 *bdata = bitmap + (tile * 256 + chip * 8 + b * 32) * 8;
for (i = 0; i < 64; i++) {
tdata[i] <<= 1;
tdata[i] |= (bdata[i] & 0x80) ? 0x01 : 0x00;
}
}
} else {
/* Oops, we should never get here! */
WARN_ON(1);
return 0;
}
for (i = 0; i < 64; i++)
if (tdata[i] != vdata[i]) {
changed = 1;
vdata[i] = tdata[i];
}
return changed;
}
/* Reconfigure LCD display */
static int picolcd_fb_reset(struct picolcd_data *data, int clear)
{
struct hid_report *report = picolcd_out_report(REPORT_LCD_CMD, data->hdev);
int i, j;
unsigned long flags;
static const u8 mapcmd[8] = { 0x00, 0x02, 0x00, 0x64, 0x3f, 0x00, 0x64, 0xc0 };
if (!report || report->maxfield != 1)
return -ENODEV;
spin_lock_irqsave(&data->lock, flags);
for (i = 0; i < 4; i++) {
for (j = 0; j < report->field[0]->maxusage; j++)
if (j == 0)
hid_set_field(report->field[0], j, i << 2);
else if (j < sizeof(mapcmd))
hid_set_field(report->field[0], j, mapcmd[j]);
else
hid_set_field(report->field[0], j, 0);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
}
data->status |= PICOLCD_READY_FB;
spin_unlock_irqrestore(&data->lock, flags);
if (data->fb_bitmap) {
if (clear) {
memset(data->fb_vbitmap, 0, PICOLCDFB_SIZE);
memset(data->fb_bitmap, 0, PICOLCDFB_SIZE*data->fb_bpp);
}
data->fb_force = 1;
}
/* schedule first output of framebuffer */
if (data->fb_info)
schedule_delayed_work(&data->fb_info->deferred_work, 0);
return 0;
}
/* Update fb_vbitmap from the screen_base and send changed tiles to device */
static void picolcd_fb_update(struct picolcd_data *data)
{
int chip, tile, n;
unsigned long flags;
if (!data)
return;
spin_lock_irqsave(&data->lock, flags);
if (!(data->status & PICOLCD_READY_FB)) {
spin_unlock_irqrestore(&data->lock, flags);
picolcd_fb_reset(data, 0);
} else {
spin_unlock_irqrestore(&data->lock, flags);
}
/*
* Translate the framebuffer into the format needed by the PicoLCD.
* See display layout above.
* Do this one tile after the other and push those tiles that changed.
*
* Wait for our IO to complete as otherwise we might flood the queue!
*/
n = 0;
for (chip = 0; chip < 4; chip++)
for (tile = 0; tile < 8; tile++)
if (picolcd_fb_update_tile(data->fb_vbitmap,
data->fb_bitmap, data->fb_bpp, chip, tile) ||
data->fb_force) {
n += 2;
if (!data->fb_info->par)
return; /* device lost! */
if (n >= HID_OUTPUT_FIFO_SIZE / 2) {
usbhid_wait_io(data->hdev);
n = 0;
}
picolcd_fb_send_tile(data->hdev, chip, tile);
}
data->fb_force = false;
if (n)
usbhid_wait_io(data->hdev);
}
/* Stub to call the system default and update the image on the picoLCD */
static void picolcd_fb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
{
if (!info->par)
return;
sys_fillrect(info, rect);
schedule_delayed_work(&info->deferred_work, 0);
}
/* Stub to call the system default and update the image on the picoLCD */
static void picolcd_fb_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
{
if (!info->par)
return;
sys_copyarea(info, area);
schedule_delayed_work(&info->deferred_work, 0);
}
/* Stub to call the system default and update the image on the picoLCD */
static void picolcd_fb_imageblit(struct fb_info *info, const struct fb_image *image)
{
if (!info->par)
return;
sys_imageblit(info, image);
schedule_delayed_work(&info->deferred_work, 0);
}
/*
* this is the slow path from userspace. they can seek and write to
* the fb. it's inefficient to do anything less than a full screen draw
*/
static ssize_t picolcd_fb_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t ret;
if (!info->par)
return -ENODEV;
ret = fb_sys_write(info, buf, count, ppos);
if (ret >= 0)
schedule_delayed_work(&info->deferred_work, 0);
return ret;
}
static int picolcd_fb_blank(int blank, struct fb_info *info)
{
if (!info->par)
return -ENODEV;
/* We let fb notification do this for us via lcd/backlight device */
return 0;
}
static void picolcd_fb_destroy(struct fb_info *info)
{
struct picolcd_data *data = info->par;
u32 *ref_cnt = info->pseudo_palette;
int may_release;
info->par = NULL;
if (data)
data->fb_info = NULL;
fb_deferred_io_cleanup(info);
ref_cnt--;
mutex_lock(&info->lock);
(*ref_cnt)--;
may_release = !*ref_cnt;
mutex_unlock(&info->lock);
if (may_release) {
vfree((u8 *)info->fix.smem_start);
framebuffer_release(info);
}
}
static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
__u32 bpp = var->bits_per_pixel;
__u32 activate = var->activate;
/* only allow 1/8 bit depth (8-bit is grayscale) */
*var = picolcdfb_var;
var->activate = activate;
if (bpp >= 8) {
var->bits_per_pixel = 8;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
} else {
var->bits_per_pixel = 1;
var->red.length = 1;
var->green.length = 1;
var->blue.length = 1;
}
return 0;
}
static int picolcd_set_par(struct fb_info *info)
{
struct picolcd_data *data = info->par;
u8 *tmp_fb, *o_fb;
if (!data)
return -ENODEV;
if (info->var.bits_per_pixel == data->fb_bpp)
return 0;
/* switch between 1/8 bit depths */
if (info->var.bits_per_pixel != 1 && info->var.bits_per_pixel != 8)
return -EINVAL;
o_fb = data->fb_bitmap;
tmp_fb = kmalloc(PICOLCDFB_SIZE*info->var.bits_per_pixel, GFP_KERNEL);
if (!tmp_fb)
return -ENOMEM;
/* translate FB content to new bits-per-pixel */
if (info->var.bits_per_pixel == 1) {
int i, b;
for (i = 0; i < PICOLCDFB_SIZE; i++) {
u8 p = 0;
for (b = 0; b < 8; b++) {
p <<= 1;
p |= o_fb[i*8+b] ? 0x01 : 0x00;
}
tmp_fb[i] = p;
}
memcpy(o_fb, tmp_fb, PICOLCDFB_SIZE);
info->fix.visual = FB_VISUAL_MONO01;
info->fix.line_length = PICOLCDFB_WIDTH / 8;
} else {
int i;
memcpy(tmp_fb, o_fb, PICOLCDFB_SIZE);
for (i = 0; i < PICOLCDFB_SIZE * 8; i++)
o_fb[i] = tmp_fb[i/8] & (0x01 << (7 - i % 8)) ? 0xff : 0x00;
info->fix.visual = FB_VISUAL_DIRECTCOLOR;
info->fix.line_length = PICOLCDFB_WIDTH;
}
kfree(tmp_fb);
data->fb_bpp = info->var.bits_per_pixel;
return 0;
}
/* Do refcounting on our FB and cleanup per worker if FB is
* closed after unplug of our device
* (fb_release holds info->lock and still touches info after
* we return so we can't release it immediately.
*/
struct picolcd_fb_cleanup_item {
struct fb_info *info;
struct picolcd_fb_cleanup_item *next;
};
static struct picolcd_fb_cleanup_item *fb_pending;
DEFINE_SPINLOCK(fb_pending_lock);
static void picolcd_fb_do_cleanup(struct work_struct *data)
{
struct picolcd_fb_cleanup_item *item;
unsigned long flags;
do {
spin_lock_irqsave(&fb_pending_lock, flags);
item = fb_pending;
fb_pending = item ? item->next : NULL;
spin_unlock_irqrestore(&fb_pending_lock, flags);
if (item) {
u8 *fb = (u8 *)item->info->fix.smem_start;
/* make sure we do not race against fb core when
* releasing */
mutex_lock(&item->info->lock);
mutex_unlock(&item->info->lock);
framebuffer_release(item->info);
vfree(fb);
}
} while (item);
}
DECLARE_WORK(picolcd_fb_cleanup, picolcd_fb_do_cleanup);
static int picolcd_fb_open(struct fb_info *info, int u)
{
u32 *ref_cnt = info->pseudo_palette;
ref_cnt--;
(*ref_cnt)++;
return 0;
}
static int picolcd_fb_release(struct fb_info *info, int u)
{
u32 *ref_cnt = info->pseudo_palette;
ref_cnt--;
(*ref_cnt)++;
if (!*ref_cnt) {
unsigned long flags;
struct picolcd_fb_cleanup_item *item = (struct picolcd_fb_cleanup_item *)ref_cnt;
item--;
spin_lock_irqsave(&fb_pending_lock, flags);
item->next = fb_pending;
fb_pending = item;
spin_unlock_irqrestore(&fb_pending_lock, flags);
schedule_work(&picolcd_fb_cleanup);
}
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_open = picolcd_fb_open,
.fb_release = picolcd_fb_release,
.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->par);
}
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);
unsigned i, fb_update_rate = data->fb_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);
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;
data->fb_update_rate = u;
data->fb_defio.delay = HZ / data->fb_update_rate;
return count;
}
static DEVICE_ATTR(fb_update_rate, 0666, picolcd_fb_update_rate_show,
picolcd_fb_update_rate_store);
/* initialize Framebuffer device */
static int picolcd_init_framebuffer(struct picolcd_data *data)
{
struct device *dev = &data->hdev->dev;
struct fb_info *info = NULL;
int i, error = -ENOMEM;
u8 *fb_vbitmap = NULL;
u8 *fb_bitmap = NULL;
u32 *palette;
fb_bitmap = vmalloc(PICOLCDFB_SIZE*8);
if (fb_bitmap == NULL) {
dev_err(dev, "can't get a free page for framebuffer\n");
goto err_nomem;
}
fb_vbitmap = kmalloc(PICOLCDFB_SIZE, GFP_KERNEL);
if (fb_vbitmap == NULL) {
dev_err(dev, "can't alloc vbitmap image buffer\n");
goto err_nomem;
}
data->fb_update_rate = PICOLCDFB_UPDATE_RATE_DEFAULT;
data->fb_defio = picolcd_fb_defio;
/* The extra memory is:
* - struct picolcd_fb_cleanup_item
* - u32 for ref_count
* - 256*u32 for pseudo_palette
*/
info = framebuffer_alloc(257 * sizeof(u32) + sizeof(struct picolcd_fb_cleanup_item), dev);
if (info == NULL) {
dev_err(dev, "failed to allocate a framebuffer\n");
goto err_nomem;
}
palette = info->par + sizeof(struct picolcd_fb_cleanup_item);
*palette = 1;
palette++;
for (i = 0; i < 256; i++)
palette[i] = i > 0 && i < 16 ? 0xff : 0;
info->pseudo_palette = palette;
info->fbdefio = &data->fb_defio;
info->screen_base = (char __force __iomem *)fb_bitmap;
info->fbops = &picolcdfb_ops;
info->var = picolcdfb_var;
info->fix = picolcdfb_fix;
info->fix.smem_len = PICOLCDFB_SIZE*8;
info->fix.smem_start = (unsigned long)fb_bitmap;
info->par = data;
info->flags = FBINFO_FLAG_DEFAULT;
data->fb_vbitmap = fb_vbitmap;
data->fb_bitmap = fb_bitmap;
data->fb_bpp = picolcdfb_var.bits_per_pixel;
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);
data->fb_info = info;
error = register_framebuffer(info);
if (error) {
dev_err(dev, "failed to register framebuffer\n");
goto err_sysfs;
}
/* schedule first output of framebuffer */
data->fb_force = 1;
schedule_delayed_work(&info->deferred_work, 0);
return 0;
err_sysfs:
fb_deferred_io_cleanup(info);
device_remove_file(dev, &dev_attr_fb_update_rate);
err_cleanup:
data->fb_vbitmap = NULL;
data->fb_bitmap = NULL;
data->fb_bpp = 0;
data->fb_info = NULL;
err_nomem:
framebuffer_release(info);
vfree(fb_bitmap);
kfree(fb_vbitmap);
return error;
}
static void picolcd_exit_framebuffer(struct picolcd_data *data)
{
struct fb_info *info = data->fb_info;
u8 *fb_vbitmap = data->fb_vbitmap;
if (!info)
return;
info->par = NULL;
device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate);
unregister_framebuffer(info);
data->fb_vbitmap = NULL;
data->fb_bitmap = NULL;
data->fb_bpp = 0;
data->fb_info = NULL;
kfree(fb_vbitmap);
}
#define picolcd_fbinfo(d) ((d)->fb_info)
#else
static inline int picolcd_fb_reset(struct picolcd_data *data, int clear)
{
return 0;
}
static inline int picolcd_init_framebuffer(struct picolcd_data *data)
{
return 0;
}
static inline void picolcd_exit_framebuffer(struct picolcd_data *data)
{
}
#define picolcd_fbinfo(d) NULL
#endif /* CONFIG_HID_PICOLCD_FB */
#ifdef CONFIG_HID_PICOLCD_BACKLIGHT
/*
* backlight class device
*/
static int picolcd_get_brightness(struct backlight_device *bdev)
{
struct picolcd_data *data = bl_get_data(bdev);
return data->lcd_brightness;
}
static int picolcd_set_brightness(struct backlight_device *bdev)
{
struct picolcd_data *data = bl_get_data(bdev);
struct hid_report *report = picolcd_out_report(REPORT_BRIGHTNESS, data->hdev);
unsigned long flags;
if (!report || report->maxfield != 1 || report->field[0]->report_count != 1)
return -ENODEV;
data->lcd_brightness = bdev->props.brightness & 0x0ff;
data->lcd_power = bdev->props.power;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0);
usbhid_submit_report(data->hdev, report, USB_DIR_OUT);
spin_unlock_irqrestore(&data->lock, flags);
return 0;
}
static int picolcd_check_bl_fb(struct backlight_device *bdev, struct fb_info *fb)
{
return fb && fb == picolcd_fbinfo((struct picolcd_data *)bl_get_data(bdev));
}
static const struct backlight_ops picolcd_blops = {
.update_status = picolcd_set_brightness,
.get_brightness = picolcd_get_brightness,
.check_fb = picolcd_check_bl_fb,
};
static int picolcd_init_backlight(struct picolcd_data *data, struct hid_report *report)
{
struct device *dev = &data->hdev->dev;
struct backlight_device *bdev;
struct backlight_properties props;
if (!report)
return -ENODEV;
if (report->maxfield != 1 || report->field[0]->report_count != 1 ||
report->field[0]->report_size != 8) {
dev_err(dev, "unsupported BRIGHTNESS report");
return -EINVAL;
}
memset(&props, 0, sizeof(props));
props.max_brightness = 0xff;
bdev = backlight_device_register(dev_name(dev), dev, data,
&picolcd_blops, &props);
if (IS_ERR(bdev)) {
dev_err(dev, "failed to register backlight\n");
return PTR_ERR(bdev);
}
bdev->props.brightness = 0xff;
data->lcd_brightness = 0xff;
data->backlight = bdev;
picolcd_set_brightness(bdev);
return 0;
}
static void picolcd_exit_backlight(struct picolcd_data *data)
{
struct backlight_device *bdev = data->backlight;
data->backlight = NULL;
if (bdev)
backlight_device_unregister(bdev);
}
static inline int picolcd_resume_backlight(struct picolcd_data *data)
{
if (!data->backlight)
return 0;
return picolcd_set_brightness(data->backlight);
}
#ifdef CONFIG_PM
static void picolcd_suspend_backlight(struct picolcd_data *data)
{
int bl_power = data->lcd_power;
if (!data->backlight)
return;
data->backlight->props.power = FB_BLANK_POWERDOWN;
picolcd_set_brightness(data->backlight);
data->lcd_power = data->backlight->props.power = bl_power;
}
#endif /* CONFIG_PM */
#else
static inline int picolcd_init_backlight(struct picolcd_data *data,
struct hid_report *report)
{
return 0;
}
static inline void picolcd_exit_backlight(struct picolcd_data *data)
{
}
static inline int picolcd_resume_backlight(struct picolcd_data *data)
{
return 0;