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296 lines
7.3 KiB
296 lines
7.3 KiB
/* |
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* Raspberry Pi Sense HAT framebuffer driver |
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* http://raspberrypi.org |
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* |
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* Copyright (C) 2015 Raspberry Pi |
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* |
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* Author: Serge Schneider |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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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/uaccess.h> |
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#include <linux/delay.h> |
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#include <linux/fb.h> |
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#include <linux/init.h> |
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#include <linux/mfd/rpisense/framebuffer.h> |
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#include <linux/mfd/rpisense/core.h> |
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static bool lowlight; |
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module_param(lowlight, bool, 0); |
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MODULE_PARM_DESC(lowlight, "Reduce LED matrix brightness to one third"); |
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static struct rpisense *rpisense; |
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struct rpisense_fb_param { |
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char __iomem *vmem; |
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u8 *vmem_work; |
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u32 vmemsize; |
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u8 *gamma; |
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}; |
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static u8 gamma_default[32] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, |
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0x02, 0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07, |
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0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0E, 0x0F, 0x11, |
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0x12, 0x14, 0x15, 0x17, 0x19, 0x1B, 0x1D, 0x1F,}; |
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static u8 gamma_low[32] = {0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
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0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, |
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0x03, 0x03, 0x03, 0x04, 0x04, 0x05, 0x05, 0x06, |
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0x06, 0x07, 0x07, 0x08, 0x08, 0x09, 0x0A, 0x0A,}; |
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static u8 gamma_user[32]; |
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static u32 pseudo_palette[16]; |
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static struct rpisense_fb_param rpisense_fb_param = { |
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.vmem = NULL, |
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.vmemsize = 128, |
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.gamma = gamma_default, |
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}; |
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static struct fb_deferred_io rpisense_fb_defio; |
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static struct fb_fix_screeninfo rpisense_fb_fix = { |
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.id = "RPi-Sense FB", |
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.type = FB_TYPE_PACKED_PIXELS, |
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.visual = FB_VISUAL_TRUECOLOR, |
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.xpanstep = 0, |
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.ypanstep = 0, |
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.ywrapstep = 0, |
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.accel = FB_ACCEL_NONE, |
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.line_length = 16, |
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}; |
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static struct fb_var_screeninfo rpisense_fb_var = { |
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.xres = 8, |
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.yres = 8, |
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.xres_virtual = 8, |
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.yres_virtual = 8, |
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.bits_per_pixel = 16, |
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.red = {11, 5, 0}, |
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.green = {5, 6, 0}, |
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.blue = {0, 5, 0}, |
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}; |
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static ssize_t rpisense_fb_write(struct fb_info *info, |
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const char __user *buf, size_t count, |
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loff_t *ppos) |
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{ |
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ssize_t res = fb_sys_write(info, buf, count, ppos); |
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schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay); |
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return res; |
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} |
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static void rpisense_fb_fillrect(struct fb_info *info, |
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const struct fb_fillrect *rect) |
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{ |
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sys_fillrect(info, rect); |
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schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay); |
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} |
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static void rpisense_fb_copyarea(struct fb_info *info, |
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const struct fb_copyarea *area) |
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{ |
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sys_copyarea(info, area); |
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schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay); |
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} |
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static void rpisense_fb_imageblit(struct fb_info *info, |
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const struct fb_image *image) |
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{ |
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sys_imageblit(info, image); |
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schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay); |
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} |
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static void rpisense_fb_deferred_io(struct fb_info *info, |
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struct list_head *pagelist) |
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{ |
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int i; |
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int j; |
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u8 *vmem_work = rpisense_fb_param.vmem_work; |
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u16 *mem = (u16 *)rpisense_fb_param.vmem; |
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u8 *gamma = rpisense_fb_param.gamma; |
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vmem_work[0] = 0; |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 8; i++) { |
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vmem_work[(j * 24) + i + 1] = |
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gamma[(mem[(j * 8) + i] >> 11) & 0x1F]; |
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vmem_work[(j * 24) + (i + 8) + 1] = |
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gamma[(mem[(j * 8) + i] >> 6) & 0x1F]; |
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vmem_work[(j * 24) + (i + 16) + 1] = |
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gamma[(mem[(j * 8) + i]) & 0x1F]; |
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} |
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} |
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rpisense_block_write(rpisense, vmem_work, 193); |
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} |
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static struct fb_deferred_io rpisense_fb_defio = { |
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.delay = HZ/100, |
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.deferred_io = rpisense_fb_deferred_io, |
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}; |
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static int rpisense_fb_ioctl(struct fb_info *info, unsigned int cmd, |
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unsigned long arg) |
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{ |
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switch (cmd) { |
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case SENSEFB_FBIOGET_GAMMA: |
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if (copy_to_user((void __user *) arg, rpisense_fb_param.gamma, |
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sizeof(u8[32]))) |
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return -EFAULT; |
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return 0; |
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case SENSEFB_FBIOSET_GAMMA: |
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if (copy_from_user(gamma_user, (void __user *)arg, |
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sizeof(u8[32]))) |
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return -EFAULT; |
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rpisense_fb_param.gamma = gamma_user; |
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schedule_delayed_work(&info->deferred_work, |
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rpisense_fb_defio.delay); |
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return 0; |
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case SENSEFB_FBIORESET_GAMMA: |
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switch (arg) { |
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case 0: |
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rpisense_fb_param.gamma = gamma_default; |
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break; |
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case 1: |
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rpisense_fb_param.gamma = gamma_low; |
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break; |
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case 2: |
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rpisense_fb_param.gamma = gamma_user; |
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break; |
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default: |
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return -EINVAL; |
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} |
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schedule_delayed_work(&info->deferred_work, |
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rpisense_fb_defio.delay); |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static struct fb_ops rpisense_fb_ops = { |
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.owner = THIS_MODULE, |
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.fb_read = fb_sys_read, |
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.fb_write = rpisense_fb_write, |
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.fb_fillrect = rpisense_fb_fillrect, |
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.fb_copyarea = rpisense_fb_copyarea, |
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.fb_imageblit = rpisense_fb_imageblit, |
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.fb_ioctl = rpisense_fb_ioctl, |
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}; |
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static int rpisense_fb_probe(struct platform_device *pdev) |
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{ |
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struct fb_info *info; |
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int ret = -ENOMEM; |
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struct rpisense_fb *rpisense_fb; |
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rpisense = rpisense_get_dev(); |
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rpisense_fb = &rpisense->framebuffer; |
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rpisense_fb_param.vmem = vzalloc(rpisense_fb_param.vmemsize); |
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if (!rpisense_fb_param.vmem) |
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return ret; |
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rpisense_fb_param.vmem_work = devm_kmalloc(&pdev->dev, 193, GFP_KERNEL); |
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if (!rpisense_fb_param.vmem_work) |
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goto err_malloc; |
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info = framebuffer_alloc(0, &pdev->dev); |
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if (!info) { |
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dev_err(&pdev->dev, "Could not allocate framebuffer.\n"); |
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goto err_malloc; |
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} |
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rpisense_fb->info = info; |
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rpisense_fb_fix.smem_start = (unsigned long)rpisense_fb_param.vmem; |
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rpisense_fb_fix.smem_len = rpisense_fb_param.vmemsize; |
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info->fbops = &rpisense_fb_ops; |
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info->fix = rpisense_fb_fix; |
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info->var = rpisense_fb_var; |
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info->fbdefio = &rpisense_fb_defio; |
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info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB; |
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info->screen_base = rpisense_fb_param.vmem; |
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info->screen_size = rpisense_fb_param.vmemsize; |
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info->pseudo_palette = pseudo_palette; |
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if (lowlight) |
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rpisense_fb_param.gamma = gamma_low; |
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fb_deferred_io_init(info); |
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ret = register_framebuffer(info); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "Could not register framebuffer.\n"); |
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goto err_fballoc; |
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} |
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fb_info(info, "%s frame buffer device\n", info->fix.id); |
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schedule_delayed_work(&info->deferred_work, rpisense_fb_defio.delay); |
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return 0; |
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err_fballoc: |
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framebuffer_release(info); |
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err_malloc: |
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vfree(rpisense_fb_param.vmem); |
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return ret; |
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} |
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static int rpisense_fb_remove(struct platform_device *pdev) |
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{ |
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struct rpisense_fb *rpisense_fb = &rpisense->framebuffer; |
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struct fb_info *info = rpisense_fb->info; |
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if (info) { |
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unregister_framebuffer(info); |
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fb_deferred_io_cleanup(info); |
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framebuffer_release(info); |
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vfree(rpisense_fb_param.vmem); |
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} |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id rpisense_fb_id[] = { |
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{ .compatible = "rpi,rpi-sense-fb" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, rpisense_fb_id); |
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#endif |
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static struct platform_device_id rpisense_fb_device_id[] = { |
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{ .name = "rpi-sense-fb" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(platform, rpisense_fb_device_id); |
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static struct platform_driver rpisense_fb_driver = { |
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.probe = rpisense_fb_probe, |
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.remove = rpisense_fb_remove, |
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.driver = { |
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.name = "rpi-sense-fb", |
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.owner = THIS_MODULE, |
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}, |
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}; |
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module_platform_driver(rpisense_fb_driver); |
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MODULE_DESCRIPTION("Raspberry Pi Sense HAT framebuffer driver"); |
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MODULE_AUTHOR("Serge Schneider <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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