![Konrad Rzeszutek Wilk](/assets/img/avatar_default.png)
The framebuffers (screenbase) these drivers present are actually vmalloc-ed pages. There is no need for them to have the VM_IO flag set. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Jaya Kumar <jayakumar.lkml@gmail.com>
795 lines
18 KiB
C
795 lines
18 KiB
C
/*
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* linux/drivers/video/metronomefb.c -- FB driver for Metronome controller
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*
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* Copyright (C) 2008, Jaya Kumar
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
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*
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* This work was made possible by help and equipment support from E-Ink
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* Corporation. http://support.eink.com/community
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*
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* This driver is written to be used with the Metronome display controller.
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* It is intended to be architecture independent. A board specific driver
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* must be used to perform all the physical IO interactions. An example
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* is provided as am200epd.c
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/firmware.h>
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#include <linux/dma-mapping.h>
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#include <linux/uaccess.h>
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#include <linux/irq.h>
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#include <video/metronomefb.h>
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#include <asm/unaligned.h>
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/* Display specific information */
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#define DPY_W 832
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#define DPY_H 622
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static int user_wfm_size;
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/* frame differs from image. frame includes non-visible pixels */
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struct epd_frame {
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int fw; /* frame width */
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int fh; /* frame height */
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u16 config[4];
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int wfm_size;
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};
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static struct epd_frame epd_frame_table[] = {
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{
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.fw = 832,
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.fh = 622,
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.config = {
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15 /* sdlew */
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| 2 << 8 /* sdosz */
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| 0 << 11 /* sdor */
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| 0 << 12 /* sdces */
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| 0 << 15, /* sdcer */
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42 /* gdspl */
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| 1 << 8 /* gdr1 */
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| 1 << 9 /* sdshr */
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| 0 << 15, /* gdspp */
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18 /* gdspw */
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| 0 << 15, /* dispc */
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599 /* vdlc */
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| 0 << 11 /* dsi */
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| 0 << 12, /* dsic */
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},
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.wfm_size = 47001,
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},
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{
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.fw = 1088,
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.fh = 791,
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.config = {
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0x0104,
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0x031f,
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0x0088,
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0x02ff,
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},
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.wfm_size = 46770,
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},
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{
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.fw = 1200,
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.fh = 842,
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.config = {
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0x0101,
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0x030e,
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0x0012,
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0x0280,
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},
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.wfm_size = 46770,
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},
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};
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static struct fb_fix_screeninfo metronomefb_fix __devinitdata = {
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.id = "metronomefb",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_STATIC_PSEUDOCOLOR,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = DPY_W,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_var_screeninfo metronomefb_var __devinitdata = {
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.xres = DPY_W,
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.yres = DPY_H,
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.xres_virtual = DPY_W,
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.yres_virtual = DPY_H,
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.bits_per_pixel = 8,
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.grayscale = 1,
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.nonstd = 1,
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.red = { 4, 3, 0 },
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.green = { 0, 0, 0 },
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.blue = { 0, 0, 0 },
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.transp = { 0, 0, 0 },
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};
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/* the waveform structure that is coming from userspace firmware */
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struct waveform_hdr {
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u8 stuff[32];
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u8 wmta[3];
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u8 fvsn;
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u8 luts;
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u8 mc;
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u8 trc;
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u8 stuff3;
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u8 endb;
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u8 swtb;
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u8 stuff2a[2];
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u8 stuff2b[3];
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u8 wfm_cs;
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} __attribute__ ((packed));
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/* main metronomefb functions */
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static u8 calc_cksum(int start, int end, u8 *mem)
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{
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u8 tmp = 0;
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int i;
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for (i = start; i < end; i++)
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tmp += mem[i];
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return tmp;
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}
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static u16 calc_img_cksum(u16 *start, int length)
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{
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u16 tmp = 0;
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while (length--)
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tmp += *start++;
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return tmp;
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}
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/* here we decode the incoming waveform file and populate metromem */
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static int __devinit load_waveform(u8 *mem, size_t size, int m, int t,
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struct metronomefb_par *par)
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{
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int tta;
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int wmta;
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int trn = 0;
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int i;
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unsigned char v;
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u8 cksum;
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int cksum_idx;
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int wfm_idx, owfm_idx;
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int mem_idx = 0;
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struct waveform_hdr *wfm_hdr;
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u8 *metromem = par->metromem_wfm;
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struct device *dev = par->info->dev;
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if (user_wfm_size)
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epd_frame_table[par->dt].wfm_size = user_wfm_size;
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if (size != epd_frame_table[par->dt].wfm_size) {
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dev_err(dev, "Error: unexpected size %Zd != %d\n", size,
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epd_frame_table[par->dt].wfm_size);
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return -EINVAL;
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}
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wfm_hdr = (struct waveform_hdr *) mem;
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if (wfm_hdr->fvsn != 1) {
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dev_err(dev, "Error: bad fvsn %x\n", wfm_hdr->fvsn);
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return -EINVAL;
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}
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if (wfm_hdr->luts != 0) {
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dev_err(dev, "Error: bad luts %x\n", wfm_hdr->luts);
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return -EINVAL;
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}
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cksum = calc_cksum(32, 47, mem);
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if (cksum != wfm_hdr->wfm_cs) {
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dev_err(dev, "Error: bad cksum %x != %x\n", cksum,
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wfm_hdr->wfm_cs);
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return -EINVAL;
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}
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wfm_hdr->mc += 1;
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wfm_hdr->trc += 1;
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for (i = 0; i < 5; i++) {
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if (*(wfm_hdr->stuff2a + i) != 0) {
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dev_err(dev, "Error: unexpected value in padding\n");
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return -EINVAL;
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}
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}
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/* calculating trn. trn is something used to index into
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the waveform. presumably selecting the right one for the
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desired temperature. it works out the offset of the first
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v that exceeds the specified temperature */
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if ((sizeof(*wfm_hdr) + wfm_hdr->trc) > size)
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return -EINVAL;
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for (i = sizeof(*wfm_hdr); i <= sizeof(*wfm_hdr) + wfm_hdr->trc; i++) {
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if (mem[i] > t) {
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trn = i - sizeof(*wfm_hdr) - 1;
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break;
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}
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}
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/* check temperature range table checksum */
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cksum_idx = sizeof(*wfm_hdr) + wfm_hdr->trc + 1;
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if (cksum_idx > size)
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return -EINVAL;
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cksum = calc_cksum(sizeof(*wfm_hdr), cksum_idx, mem);
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if (cksum != mem[cksum_idx]) {
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dev_err(dev, "Error: bad temperature range table cksum"
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" %x != %x\n", cksum, mem[cksum_idx]);
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return -EINVAL;
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}
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/* check waveform mode table address checksum */
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wmta = get_unaligned_le32(wfm_hdr->wmta) & 0x00FFFFFF;
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cksum_idx = wmta + m*4 + 3;
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if (cksum_idx > size)
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return -EINVAL;
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cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
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if (cksum != mem[cksum_idx]) {
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dev_err(dev, "Error: bad mode table address cksum"
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" %x != %x\n", cksum, mem[cksum_idx]);
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return -EINVAL;
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}
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/* check waveform temperature table address checksum */
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tta = get_unaligned_le32(mem + wmta + m * 4) & 0x00FFFFFF;
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cksum_idx = tta + trn*4 + 3;
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if (cksum_idx > size)
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return -EINVAL;
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cksum = calc_cksum(cksum_idx - 3, cksum_idx, mem);
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if (cksum != mem[cksum_idx]) {
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dev_err(dev, "Error: bad temperature table address cksum"
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" %x != %x\n", cksum, mem[cksum_idx]);
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return -EINVAL;
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}
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/* here we do the real work of putting the waveform into the
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metromem buffer. this does runlength decoding of the waveform */
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wfm_idx = get_unaligned_le32(mem + tta + trn * 4) & 0x00FFFFFF;
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owfm_idx = wfm_idx;
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if (wfm_idx > size)
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return -EINVAL;
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while (wfm_idx < size) {
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unsigned char rl;
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v = mem[wfm_idx++];
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if (v == wfm_hdr->swtb) {
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while (((v = mem[wfm_idx++]) != wfm_hdr->swtb) &&
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wfm_idx < size)
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metromem[mem_idx++] = v;
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continue;
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}
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if (v == wfm_hdr->endb)
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break;
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rl = mem[wfm_idx++];
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for (i = 0; i <= rl; i++)
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metromem[mem_idx++] = v;
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}
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cksum_idx = wfm_idx;
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if (cksum_idx > size)
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return -EINVAL;
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cksum = calc_cksum(owfm_idx, cksum_idx, mem);
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if (cksum != mem[cksum_idx]) {
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dev_err(dev, "Error: bad waveform data cksum"
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" %x != %x\n", cksum, mem[cksum_idx]);
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return -EINVAL;
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}
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par->frame_count = (mem_idx/64);
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return 0;
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}
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static int metronome_display_cmd(struct metronomefb_par *par)
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{
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int i;
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u16 cs;
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u16 opcode;
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static u8 borderval;
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/* setup display command
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we can't immediately set the opcode since the controller
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will try parse the command before we've set it all up
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so we just set cs here and set the opcode at the end */
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if (par->metromem_cmd->opcode == 0xCC40)
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opcode = cs = 0xCC41;
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else
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opcode = cs = 0xCC40;
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/* set the args ( 2 bytes ) for display */
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i = 0;
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par->metromem_cmd->args[i] = 1 << 3 /* border update */
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| ((borderval++ % 4) & 0x0F) << 4
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| (par->frame_count - 1) << 8;
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cs += par->metromem_cmd->args[i++];
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/* the rest are 0 */
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memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
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par->metromem_cmd->csum = cs;
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par->metromem_cmd->opcode = opcode; /* display cmd */
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return par->board->met_wait_event_intr(par);
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}
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static int __devinit metronome_powerup_cmd(struct metronomefb_par *par)
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{
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int i;
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u16 cs;
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/* setup power up command */
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par->metromem_cmd->opcode = 0x1234; /* pwr up pseudo cmd */
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cs = par->metromem_cmd->opcode;
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/* set pwr1,2,3 to 1024 */
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for (i = 0; i < 3; i++) {
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par->metromem_cmd->args[i] = 1024;
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cs += par->metromem_cmd->args[i];
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}
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/* the rest are 0 */
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memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
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par->metromem_cmd->csum = cs;
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msleep(1);
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par->board->set_rst(par, 1);
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msleep(1);
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par->board->set_stdby(par, 1);
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return par->board->met_wait_event(par);
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}
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static int __devinit metronome_config_cmd(struct metronomefb_par *par)
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{
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/* setup config command
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we can't immediately set the opcode since the controller
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will try parse the command before we've set it all up */
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memcpy(par->metromem_cmd->args, epd_frame_table[par->dt].config,
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sizeof(epd_frame_table[par->dt].config));
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/* the rest are 0 */
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memset((u8 *) (par->metromem_cmd->args + 4), 0, (32-4)*2);
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par->metromem_cmd->csum = 0xCC10;
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par->metromem_cmd->csum += calc_img_cksum(par->metromem_cmd->args, 4);
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par->metromem_cmd->opcode = 0xCC10; /* config cmd */
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return par->board->met_wait_event(par);
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}
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static int __devinit metronome_init_cmd(struct metronomefb_par *par)
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{
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int i;
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u16 cs;
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/* setup init command
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we can't immediately set the opcode since the controller
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will try parse the command before we've set it all up
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so we just set cs here and set the opcode at the end */
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cs = 0xCC20;
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/* set the args ( 2 bytes ) for init */
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i = 0;
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par->metromem_cmd->args[i] = 0;
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cs += par->metromem_cmd->args[i++];
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/* the rest are 0 */
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memset((u8 *) (par->metromem_cmd->args + i), 0, (32-i)*2);
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par->metromem_cmd->csum = cs;
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par->metromem_cmd->opcode = 0xCC20; /* init cmd */
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return par->board->met_wait_event(par);
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}
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static int __devinit metronome_init_regs(struct metronomefb_par *par)
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{
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int res;
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res = par->board->setup_io(par);
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if (res)
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return res;
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res = metronome_powerup_cmd(par);
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if (res)
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return res;
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res = metronome_config_cmd(par);
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if (res)
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return res;
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res = metronome_init_cmd(par);
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return res;
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}
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static void metronomefb_dpy_update(struct metronomefb_par *par)
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{
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int fbsize;
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u16 cksum;
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unsigned char *buf = (unsigned char __force *)par->info->screen_base;
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fbsize = par->info->fix.smem_len;
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/* copy from vm to metromem */
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memcpy(par->metromem_img, buf, fbsize);
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cksum = calc_img_cksum((u16 *) par->metromem_img, fbsize/2);
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*((u16 *)(par->metromem_img) + fbsize/2) = cksum;
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metronome_display_cmd(par);
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}
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static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index)
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{
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int i;
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u16 csum = 0;
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u16 *buf = (u16 __force *)(par->info->screen_base + index);
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u16 *img = (u16 *)(par->metromem_img + index);
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/* swizzle from vm to metromem and recalc cksum at the same time*/
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for (i = 0; i < PAGE_SIZE/2; i++) {
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*(img + i) = (buf[i] << 5) & 0xE0E0;
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csum += *(img + i);
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}
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return csum;
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}
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/* this is called back from the deferred io workqueue */
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static void metronomefb_dpy_deferred_io(struct fb_info *info,
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struct list_head *pagelist)
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{
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u16 cksum;
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struct page *cur;
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struct fb_deferred_io *fbdefio = info->fbdefio;
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struct metronomefb_par *par = info->par;
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/* walk the written page list and swizzle the data */
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list_for_each_entry(cur, &fbdefio->pagelist, lru) {
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cksum = metronomefb_dpy_update_page(par,
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(cur->index << PAGE_SHIFT));
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par->metromem_img_csum -= par->csum_table[cur->index];
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par->csum_table[cur->index] = cksum;
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par->metromem_img_csum += cksum;
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}
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metronome_display_cmd(par);
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}
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static void metronomefb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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struct metronomefb_par *par = info->par;
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sys_fillrect(info, rect);
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metronomefb_dpy_update(par);
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}
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static void metronomefb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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struct metronomefb_par *par = info->par;
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sys_copyarea(info, area);
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metronomefb_dpy_update(par);
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}
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static void metronomefb_imageblit(struct fb_info *info,
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const struct fb_image *image)
|
|
{
|
|
struct metronomefb_par *par = info->par;
|
|
|
|
sys_imageblit(info, image);
|
|
metronomefb_dpy_update(par);
|
|
}
|
|
|
|
/*
|
|
* this is the slow path from userspace. they can seek and write to
|
|
* the fb. it is based on fb_sys_write
|
|
*/
|
|
static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct metronomefb_par *par = info->par;
|
|
unsigned long p = *ppos;
|
|
void *dst;
|
|
int err = 0;
|
|
unsigned long total_size;
|
|
|
|
if (info->state != FBINFO_STATE_RUNNING)
|
|
return -EPERM;
|
|
|
|
total_size = info->fix.smem_len;
|
|
|
|
if (p > total_size)
|
|
return -EFBIG;
|
|
|
|
if (count > total_size) {
|
|
err = -EFBIG;
|
|
count = total_size;
|
|
}
|
|
|
|
if (count + p > total_size) {
|
|
if (!err)
|
|
err = -ENOSPC;
|
|
|
|
count = total_size - p;
|
|
}
|
|
|
|
dst = (void __force *)(info->screen_base + p);
|
|
|
|
if (copy_from_user(dst, buf, count))
|
|
err = -EFAULT;
|
|
|
|
if (!err)
|
|
*ppos += count;
|
|
|
|
metronomefb_dpy_update(par);
|
|
|
|
return (err) ? err : count;
|
|
}
|
|
|
|
static struct fb_ops metronomefb_ops = {
|
|
.owner = THIS_MODULE,
|
|
.fb_write = metronomefb_write,
|
|
.fb_fillrect = metronomefb_fillrect,
|
|
.fb_copyarea = metronomefb_copyarea,
|
|
.fb_imageblit = metronomefb_imageblit,
|
|
};
|
|
|
|
static struct fb_deferred_io metronomefb_defio = {
|
|
.delay = HZ,
|
|
.deferred_io = metronomefb_dpy_deferred_io,
|
|
};
|
|
|
|
static int __devinit metronomefb_probe(struct platform_device *dev)
|
|
{
|
|
struct fb_info *info;
|
|
struct metronome_board *board;
|
|
int retval = -ENOMEM;
|
|
int videomemorysize;
|
|
unsigned char *videomemory;
|
|
struct metronomefb_par *par;
|
|
const struct firmware *fw_entry;
|
|
int i;
|
|
int panel_type;
|
|
int fw, fh;
|
|
int epd_dt_index;
|
|
|
|
/* pick up board specific routines */
|
|
board = dev->dev.platform_data;
|
|
if (!board)
|
|
return -EINVAL;
|
|
|
|
/* try to count device specific driver, if can't, platform recalls */
|
|
if (!try_module_get(board->owner))
|
|
return -ENODEV;
|
|
|
|
info = framebuffer_alloc(sizeof(struct metronomefb_par), &dev->dev);
|
|
if (!info)
|
|
goto err;
|
|
|
|
/* we have two blocks of memory.
|
|
info->screen_base which is vm, and is the fb used by apps.
|
|
par->metromem which is physically contiguous memory and
|
|
contains the display controller commands, waveform,
|
|
processed image data and padding. this is the data pulled
|
|
by the device's LCD controller and pushed to Metronome.
|
|
the metromem memory is allocated by the board driver and
|
|
is provided to us */
|
|
|
|
panel_type = board->get_panel_type();
|
|
switch (panel_type) {
|
|
case 6:
|
|
epd_dt_index = 0;
|
|
break;
|
|
case 8:
|
|
epd_dt_index = 1;
|
|
break;
|
|
case 97:
|
|
epd_dt_index = 2;
|
|
break;
|
|
default:
|
|
dev_err(&dev->dev, "Unexpected panel type. Defaulting to 6\n");
|
|
epd_dt_index = 0;
|
|
break;
|
|
}
|
|
|
|
fw = epd_frame_table[epd_dt_index].fw;
|
|
fh = epd_frame_table[epd_dt_index].fh;
|
|
|
|
/* we need to add a spare page because our csum caching scheme walks
|
|
* to the end of the page */
|
|
videomemorysize = PAGE_SIZE + (fw * fh);
|
|
videomemory = vmalloc(videomemorysize);
|
|
if (!videomemory)
|
|
goto err_fb_rel;
|
|
|
|
memset(videomemory, 0, videomemorysize);
|
|
|
|
info->screen_base = (char __force __iomem *)videomemory;
|
|
info->fbops = &metronomefb_ops;
|
|
|
|
metronomefb_fix.line_length = fw;
|
|
metronomefb_var.xres = fw;
|
|
metronomefb_var.yres = fh;
|
|
metronomefb_var.xres_virtual = fw;
|
|
metronomefb_var.yres_virtual = fh;
|
|
info->var = metronomefb_var;
|
|
info->fix = metronomefb_fix;
|
|
info->fix.smem_len = videomemorysize;
|
|
par = info->par;
|
|
par->info = info;
|
|
par->board = board;
|
|
par->dt = epd_dt_index;
|
|
init_waitqueue_head(&par->waitq);
|
|
|
|
/* this table caches per page csum values. */
|
|
par->csum_table = vmalloc(videomemorysize/PAGE_SIZE);
|
|
if (!par->csum_table)
|
|
goto err_vfree;
|
|
|
|
/* the physical framebuffer that we use is setup by
|
|
* the platform device driver. It will provide us
|
|
* with cmd, wfm and image memory in a contiguous area. */
|
|
retval = board->setup_fb(par);
|
|
if (retval) {
|
|
dev_err(&dev->dev, "Failed to setup fb\n");
|
|
goto err_csum_table;
|
|
}
|
|
|
|
/* after this point we should have a framebuffer */
|
|
if ((!par->metromem_wfm) || (!par->metromem_img) ||
|
|
(!par->metromem_dma)) {
|
|
dev_err(&dev->dev, "fb access failure\n");
|
|
retval = -EINVAL;
|
|
goto err_csum_table;
|
|
}
|
|
|
|
info->fix.smem_start = par->metromem_dma;
|
|
|
|
/* load the waveform in. assume mode 3, temp 31 for now
|
|
a) request the waveform file from userspace
|
|
b) process waveform and decode into metromem */
|
|
retval = request_firmware(&fw_entry, "metronome.wbf", &dev->dev);
|
|
if (retval < 0) {
|
|
dev_err(&dev->dev, "Failed to get waveform\n");
|
|
goto err_csum_table;
|
|
}
|
|
|
|
retval = load_waveform((u8 *) fw_entry->data, fw_entry->size, 3, 31,
|
|
par);
|
|
release_firmware(fw_entry);
|
|
if (retval < 0) {
|
|
dev_err(&dev->dev, "Failed processing waveform\n");
|
|
goto err_csum_table;
|
|
}
|
|
|
|
if (board->setup_irq(info))
|
|
goto err_csum_table;
|
|
|
|
retval = metronome_init_regs(par);
|
|
if (retval < 0)
|
|
goto err_free_irq;
|
|
|
|
info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
|
|
|
|
info->fbdefio = &metronomefb_defio;
|
|
fb_deferred_io_init(info);
|
|
|
|
retval = fb_alloc_cmap(&info->cmap, 8, 0);
|
|
if (retval < 0) {
|
|
dev_err(&dev->dev, "Failed to allocate colormap\n");
|
|
goto err_free_irq;
|
|
}
|
|
|
|
/* set cmap */
|
|
for (i = 0; i < 8; i++)
|
|
info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/16;
|
|
memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*8);
|
|
memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*8);
|
|
|
|
retval = register_framebuffer(info);
|
|
if (retval < 0)
|
|
goto err_cmap;
|
|
|
|
platform_set_drvdata(dev, info);
|
|
|
|
dev_dbg(&dev->dev,
|
|
"fb%d: Metronome frame buffer device, using %dK of video"
|
|
" memory\n", info->node, videomemorysize >> 10);
|
|
|
|
return 0;
|
|
|
|
err_cmap:
|
|
fb_dealloc_cmap(&info->cmap);
|
|
err_free_irq:
|
|
board->cleanup(par);
|
|
err_csum_table:
|
|
vfree(par->csum_table);
|
|
err_vfree:
|
|
vfree(videomemory);
|
|
err_fb_rel:
|
|
framebuffer_release(info);
|
|
err:
|
|
module_put(board->owner);
|
|
return retval;
|
|
}
|
|
|
|
static int __devexit metronomefb_remove(struct platform_device *dev)
|
|
{
|
|
struct fb_info *info = platform_get_drvdata(dev);
|
|
|
|
if (info) {
|
|
struct metronomefb_par *par = info->par;
|
|
|
|
unregister_framebuffer(info);
|
|
fb_deferred_io_cleanup(info);
|
|
fb_dealloc_cmap(&info->cmap);
|
|
par->board->cleanup(par);
|
|
vfree(par->csum_table);
|
|
vfree((void __force *)info->screen_base);
|
|
module_put(par->board->owner);
|
|
dev_dbg(&dev->dev, "calling release\n");
|
|
framebuffer_release(info);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver metronomefb_driver = {
|
|
.probe = metronomefb_probe,
|
|
.remove = metronomefb_remove,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "metronomefb",
|
|
},
|
|
};
|
|
|
|
static int __init metronomefb_init(void)
|
|
{
|
|
return platform_driver_register(&metronomefb_driver);
|
|
}
|
|
|
|
static void __exit metronomefb_exit(void)
|
|
{
|
|
platform_driver_unregister(&metronomefb_driver);
|
|
}
|
|
|
|
module_param(user_wfm_size, uint, 0);
|
|
MODULE_PARM_DESC(user_wfm_size, "Set custom waveform size");
|
|
|
|
module_init(metronomefb_init);
|
|
module_exit(metronomefb_exit);
|
|
|
|
MODULE_DESCRIPTION("fbdev driver for Metronome controller");
|
|
MODULE_AUTHOR("Jaya Kumar");
|
|
MODULE_LICENSE("GPL");
|