/*
- * linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller
+ * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
*
* Copyright (C) 2006, Jaya Kumar
* This work was sponsored by CIS(M) Sdn Bhd
* values. There are other commands that the display is capable of,
* beyond the 5 used here but they are more complex.
*
- * This driver is written to be used with the Hecuba display controller
- * board, and tested with the EInk 800x600 display in 1 bit mode.
- * The interface between Hecuba and the host is TTL based GPIO. The
- * GPIO requirements are 8 writable data lines and 6 lines for control.
- * Only 4 of the controls are actually used here but 6 for future use.
- * The driver requires the IO addresses for data and control GPIO at
- * load time. It is also possible to use this display with a standard
- * PC parallel port.
+ * This driver is written to be used with the Hecuba display architecture.
+ * The actual display chip is called Apollo and the interface electronics
+ * it needs is called Hecuba.
*
- * General notes:
- * - User must set hecubafb_enable=1 to enable it
- * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
+ * It is intended to be architecture independent. A board specific driver
+ * must be used to perform all the physical IO interactions. An example
+ * is provided as n411.c
*
*/
#include <linux/list.h>
#include <linux/uaccess.h>
-/* Apollo controller specific defines */
-#define APOLLO_START_NEW_IMG 0xA0
-#define APOLLO_STOP_IMG_DATA 0xA1
-#define APOLLO_DISPLAY_IMG 0xA2
-#define APOLLO_ERASE_DISPLAY 0xA3
-#define APOLLO_INIT_DISPLAY 0xA4
-
-/* Hecuba interface specific defines */
-/* WUP is inverted, CD is inverted, DS is inverted */
-#define HCB_NWUP_BIT 0x01
-#define HCB_NDS_BIT 0x02
-#define HCB_RW_BIT 0x04
-#define HCB_NCD_BIT 0x08
-#define HCB_ACK_BIT 0x80
+#include <video/hecubafb.h>
/* Display specific information */
#define DPY_W 600
#define DPY_H 800
-struct hecubafb_par {
- unsigned long dio_addr;
- unsigned long cio_addr;
- unsigned long c2io_addr;
- unsigned char ctl;
- struct fb_info *info;
- unsigned int irq;
-};
-
static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
.id = "hecubafb",
.type = FB_TYPE_PACKED_PIXELS,
.xpanstep = 0,
.ypanstep = 0,
.ywrapstep = 0,
+ .line_length = DPY_W,
.accel = FB_ACCEL_NONE,
};
.nonstd = 1,
};
-static unsigned long dio_addr;
-static unsigned long cio_addr;
-static unsigned long c2io_addr;
-static unsigned long splashval;
-static unsigned int nosplash;
-static unsigned int hecubafb_enable;
-static unsigned int irq;
-
-static DECLARE_WAIT_QUEUE_HEAD(hecubafb_waitq);
-
-static void hcb_set_ctl(struct hecubafb_par *par)
-{
- outb(par->ctl, par->cio_addr);
-}
-
-static unsigned char hcb_get_ctl(struct hecubafb_par *par)
-{
- return inb(par->c2io_addr);
-}
-
-static void hcb_set_data(struct hecubafb_par *par, unsigned char value)
-{
- outb(value, par->dio_addr);
-}
-
-static int __devinit apollo_init_control(struct hecubafb_par *par)
-{
- unsigned char ctl;
- /* for init, we want the following setup to be set:
- WUP = lo
- ACK = hi
- DS = hi
- RW = hi
- CD = lo
- */
-
- /* write WUP to lo, DS to hi, RW to hi, CD to lo */
- par->ctl = HCB_NWUP_BIT | HCB_RW_BIT | HCB_NCD_BIT ;
- par->ctl &= ~HCB_NDS_BIT;
- hcb_set_ctl(par);
-
- /* check ACK is not lo */
- ctl = hcb_get_ctl(par);
- if ((ctl & HCB_ACK_BIT)) {
- printk(KERN_ERR "Fail because ACK is already low\n");
- return -ENXIO;
- }
-
- return 0;
-}
-
-static void hcb_wait_for_ack(struct hecubafb_par *par)
-{
-
- int timeout;
- unsigned char ctl;
-
- timeout=500;
- do {
- ctl = hcb_get_ctl(par);
- if ((ctl & HCB_ACK_BIT))
- return;
- udelay(1);
- } while (timeout--);
- printk(KERN_ERR "timed out waiting for ack\n");
-}
-
-static void hcb_wait_for_ack_clear(struct hecubafb_par *par)
-{
-
- int timeout;
- unsigned char ctl;
-
- timeout=500;
- do {
- ctl = hcb_get_ctl(par);
- if (!(ctl & HCB_ACK_BIT))
- return;
- udelay(1);
- } while (timeout--);
- printk(KERN_ERR "timed out waiting for clear\n");
-}
+/* main hecubafb functions */
static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
{
/* set data */
- hcb_set_data(par, data);
+ par->board->set_data(par, data);
/* set DS low */
- par->ctl |= HCB_NDS_BIT;
- hcb_set_ctl(par);
+ par->board->set_ctl(par, HCB_DS_BIT, 0);
- hcb_wait_for_ack(par);
+ /* wait for ack */
+ par->board->wait_for_ack(par, 0);
/* set DS hi */
- par->ctl &= ~(HCB_NDS_BIT);
- hcb_set_ctl(par);
+ par->board->set_ctl(par, HCB_DS_BIT, 1);
- hcb_wait_for_ack_clear(par);
+ /* wait for ack to clear */
+ par->board->wait_for_ack(par, 1);
}
static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
{
/* command so set CD to high */
- par->ctl &= ~(HCB_NCD_BIT);
- hcb_set_ctl(par);
+ par->board->set_ctl(par, HCB_CD_BIT, 1);
/* actually strobe with command */
apollo_send_data(par, data);
/* clear CD back to low */
- par->ctl |= (HCB_NCD_BIT);
- hcb_set_ctl(par);
+ par->board->set_ctl(par, HCB_CD_BIT, 0);
}
-/* main hecubafb functions */
-
static void hecubafb_dpy_update(struct hecubafb_par *par)
{
int i;
unsigned char *buf = (unsigned char __force *)par->info->screen_base;
- apollo_send_command(par, 0xA0);
+ apollo_send_command(par, APOLLO_START_NEW_IMG);
for (i=0; i < (DPY_W*DPY_H/8); i++) {
apollo_send_data(par, *(buf++));
}
- apollo_send_command(par, 0xA1);
- apollo_send_command(par, 0xA2);
+ apollo_send_command(par, APOLLO_STOP_IMG_DATA);
+ apollo_send_command(par, APOLLO_DISPLAY_IMG);
}
/* this is called back from the deferred io workqueue */
static int __devinit hecubafb_probe(struct platform_device *dev)
{
struct fb_info *info;
+ struct hecuba_board *board;
int retval = -ENOMEM;
int videomemorysize;
unsigned char *videomemory;
struct hecubafb_par *par;
+ /* 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;
+
videomemorysize = (DPY_W*DPY_H)/8;
if (!(videomemory = vmalloc(videomemorysize)))
info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
if (!info)
- goto err;
+ goto err_fballoc;
- info->screen_base = (char __iomem *) videomemory;
+ info->screen_base = (char __force __iomem *)videomemory;
info->fbops = &hecubafb_ops;
info->var = hecubafb_var;
info->fix.smem_len = videomemorysize;
par = info->par;
par->info = info;
+ par->board = board;
+ par->send_command = apollo_send_command;
+ par->send_data = apollo_send_data;
- if (!dio_addr || !cio_addr || !c2io_addr) {
- printk(KERN_WARNING "no IO addresses supplied\n");
- goto err1;
- }
- par->dio_addr = dio_addr;
- par->cio_addr = cio_addr;
- par->c2io_addr = c2io_addr;
info->flags = FBINFO_FLAG_DEFAULT;
info->fbdefio = &hecubafb_defio;
retval = register_framebuffer(info);
if (retval < 0)
- goto err1;
+ goto err_fbreg;
platform_set_drvdata(dev, info);
printk(KERN_INFO
info->node, videomemorysize >> 10);
/* this inits the dpy */
- apollo_init_control(par);
-
- apollo_send_command(par, APOLLO_INIT_DISPLAY);
- apollo_send_data(par, 0x81);
-
- /* have to wait while display resets */
- udelay(1000);
-
- /* if we were told to splash the screen, we just clear it */
- if (!nosplash) {
- apollo_send_command(par, APOLLO_ERASE_DISPLAY);
- apollo_send_data(par, splashval);
- }
+ retval = par->board->init(par);
+ if (retval < 0)
+ goto err_fbreg;
return 0;
-err1:
+err_fbreg:
framebuffer_release(info);
-err:
+err_fballoc:
vfree(videomemory);
+ module_put(board->owner);
return retval;
}
struct fb_info *info = platform_get_drvdata(dev);
if (info) {
+ struct hecubafb_par *par = info->par;
fb_deferred_io_cleanup(info);
unregister_framebuffer(info);
vfree((void __force *)info->screen_base);
+ if (par->board->remove)
+ par->board->remove(par);
+ module_put(par->board->owner);
framebuffer_release(info);
}
return 0;
.probe = hecubafb_probe,
.remove = hecubafb_remove,
.driver = {
+ .owner = THIS_MODULE,
.name = "hecubafb",
},
};
-static struct platform_device *hecubafb_device;
-
static int __init hecubafb_init(void)
{
- int ret;
-
- if (!hecubafb_enable) {
- printk(KERN_ERR "Use hecubafb_enable to enable the device\n");
- return -ENXIO;
- }
-
- ret = platform_driver_register(&hecubafb_driver);
- if (!ret) {
- hecubafb_device = platform_device_alloc("hecubafb", 0);
- if (hecubafb_device)
- ret = platform_device_add(hecubafb_device);
- else
- ret = -ENOMEM;
-
- if (ret) {
- platform_device_put(hecubafb_device);
- platform_driver_unregister(&hecubafb_driver);
- }
- }
- return ret;
-
+ return platform_driver_register(&hecubafb_driver);
}
static void __exit hecubafb_exit(void)
{
- platform_device_unregister(hecubafb_device);
platform_driver_unregister(&hecubafb_driver);
}
-module_param(nosplash, uint, 0);
-MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
-module_param(hecubafb_enable, uint, 0);
-MODULE_PARM_DESC(hecubafb_enable, "Enable communication with Hecuba board");
-module_param(dio_addr, ulong, 0);
-MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
-module_param(cio_addr, ulong, 0);
-MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
-module_param(c2io_addr, ulong, 0);
-MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
-module_param(splashval, ulong, 0);
-MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
-module_param(irq, uint, 0);
-MODULE_PARM_DESC(irq, "IRQ for the Hecuba board");
-
module_init(hecubafb_init);
module_exit(hecubafb_exit);
-MODULE_DESCRIPTION("fbdev driver for Hecuba board");
+MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * linux/drivers/video/n411.c -- Platform device for N411 EPD kit
+ *
+ * Copyright (C) 2008, Jaya Kumar
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
+ *
+ * This driver is written to be used with the Hecuba display controller
+ * board, and tested with the EInk 800x600 display in 1 bit mode.
+ * The interface between Hecuba and the host is TTL based GPIO. The
+ * GPIO requirements are 8 writable data lines and 6 lines for control.
+ * Only 4 of the controls are actually used here but 6 for future use.
+ * The driver requires the IO addresses for data and control GPIO at
+ * load time. It is also possible to use this display with a standard
+ * PC parallel port.
+ *
+ * General notes:
+ * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+#include <linux/irq.h>
+
+#include <video/hecubafb.h>
+
+static unsigned long dio_addr;
+static unsigned long cio_addr;
+static unsigned long c2io_addr;
+static unsigned long splashval;
+static unsigned int nosplash;
+static unsigned char ctl;
+
+static void n411_set_ctl(struct hecubafb_par *par, unsigned char bit, unsigned
+ char state)
+{
+ switch (bit) {
+ case HCB_CD_BIT:
+ if (state)
+ ctl &= ~(HCB_CD_BIT);
+ else
+ ctl |= HCB_CD_BIT;
+ break;
+ case HCB_DS_BIT:
+ if (state)
+ ctl &= ~(HCB_DS_BIT);
+ else
+ ctl |= HCB_DS_BIT;
+ break;
+ }
+ outb(ctl, cio_addr);
+}
+
+static unsigned char n411_get_ctl(struct hecubafb_par *par)
+{
+ return inb(c2io_addr);
+}
+
+static void n411_set_data(struct hecubafb_par *par, unsigned char value)
+{
+ outb(value, dio_addr);
+}
+
+static void n411_wait_for_ack(struct hecubafb_par *par, int clear)
+{
+ int timeout;
+ unsigned char tmp;
+
+ timeout = 500;
+ do {
+ tmp = n411_get_ctl(par);
+ if ((tmp & HCB_ACK_BIT) && (!clear))
+ return;
+ else if (!(tmp & HCB_ACK_BIT) && (clear))
+ return;
+ udelay(1);
+ } while (timeout--);
+ printk(KERN_ERR "timed out waiting for ack\n");
+}
+
+static int n411_init_control(struct hecubafb_par *par)
+{
+ unsigned char tmp;
+ /* for init, we want the following setup to be set:
+ WUP = lo
+ ACK = hi
+ DS = hi
+ RW = hi
+ CD = lo
+ */
+
+ /* write WUP to lo, DS to hi, RW to hi, CD to lo */
+ ctl = HCB_WUP_BIT | HCB_RW_BIT | HCB_CD_BIT ;
+ n411_set_ctl(par, HCB_DS_BIT, 1);
+
+ /* check ACK is not lo */
+ tmp = n411_get_ctl(par);
+ if (tmp & HCB_ACK_BIT) {
+ printk(KERN_ERR "Fail because ACK is already low\n");
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+
+static int n411_init_board(struct hecubafb_par *par)
+{
+ int retval;
+
+ retval = n411_init_control(par);
+ if (retval)
+ return retval;
+
+ par->send_command(par, APOLLO_INIT_DISPLAY);
+ par->send_data(par, 0x81);
+
+ /* have to wait while display resets */
+ udelay(1000);
+
+ /* if we were told to splash the screen, we just clear it */
+ if (!nosplash) {
+ par->send_command(par, APOLLO_ERASE_DISPLAY);
+ par->send_data(par, splashval);
+ }
+
+ return 0;
+}
+
+static struct hecuba_board n411_board = {
+ .owner = THIS_MODULE,
+ .init = n411_init_board,
+ .set_ctl = n411_set_ctl,
+ .set_data = n411_set_data,
+ .wait_for_ack = n411_wait_for_ack,
+};
+
+static struct platform_device *n411_device;
+static int __init n411_init(void)
+{
+ int ret;
+ if (!dio_addr || !cio_addr || !c2io_addr) {
+ printk(KERN_WARNING "no IO addresses supplied\n");
+ return -EINVAL;
+ }
+
+ /* request our platform independent driver */
+ request_module("hecubafb");
+
+ n411_device = platform_device_alloc("hecubafb", -1);
+ if (!n411_device)
+ return -ENOMEM;
+
+ platform_device_add_data(n411_device, &n411_board, sizeof(n411_board));
+
+ /* this _add binds hecubafb to n411. hecubafb refcounts n411 */
+ ret = platform_device_add(n411_device);
+
+ if (ret)
+ platform_device_put(n411_device);
+
+ return ret;
+
+}
+
+static void __exit n411_exit(void)
+{
+ platform_device_unregister(n411_device);
+}
+
+module_init(n411_init);
+module_exit(n411_exit);
+
+module_param(nosplash, uint, 0);
+MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
+module_param(dio_addr, ulong, 0);
+MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
+module_param(cio_addr, ulong, 0);
+MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
+module_param(c2io_addr, ulong, 0);
+MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
+module_param(splashval, ulong, 0);
+MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
+
+MODULE_DESCRIPTION("board driver for n411 hecuba/apollo epd kit");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
+
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff