arch/arm/mach-pxa/am200epd.c

   1 /*
   2  * am200epd.c -- Platform device for AM200 EPD kit
   3  *
   4  * Copyright (C) 2008, Jaya Kumar
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License. See the file COPYING in the main directory of this archive for
   8  * more details.
   9  *
  10  * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
  11  *
  12  * This work was made possible by help and equipment support from E-Ink
  13  * Corporation. http://support.eink.com/community
  14  *
  15  * This driver is written to be used with the Metronome display controller.
  16  * on the AM200 EPD prototype kit/development kit with an E-Ink 800x600
  17  * Vizplex EPD on a Gumstix board using the Lyre interface board.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/errno.h>
  24 #include <linux/string.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/fb.h>
  28 #include <linux/init.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/irq.h>
  31 #include <linux/gpio.h>
  32
  33 #include <mach/pxafb.h>
  34
  35 #include <video/metronomefb.h>
  36
  37 static unsigned int panel_type = 6;
  38 static struct platform_device *am200_device;
  39 static struct metronome_board am200_board;
  40
  41 static struct pxafb_mode_info am200_fb_mode_9inch7 = {
  42         .pixclock       = 40000,
  43         .xres           = 1200,
  44         .yres           = 842,
  45         .bpp            = 16,
  46         .hsync_len      = 2,
  47         .left_margin    = 2,
  48         .right_margin   = 2,
  49         .vsync_len      = 1,
  50         .upper_margin   = 2,
  51         .lower_margin   = 25,
  52         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  53 };
  54
  55 static struct pxafb_mode_info am200_fb_mode_8inch = {
  56         .pixclock       = 40000,
  57         .xres           = 1088,
  58         .yres           = 791,
  59         .bpp            = 16,
  60         .hsync_len      = 28,
  61         .left_margin    = 8,
  62         .right_margin   = 30,
  63         .vsync_len      = 8,
  64         .upper_margin   = 10,
  65         .lower_margin   = 8,
  66         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  67 };
  68
  69 static struct pxafb_mode_info am200_fb_mode_6inch = {
  70         .pixclock       = 40189,
  71         .xres           = 832,
  72         .yres           = 622,
  73         .bpp            = 16,
  74         .hsync_len      = 28,
  75         .left_margin    = 34,
  76         .right_margin   = 34,
  77         .vsync_len      = 25,
  78         .upper_margin   = 0,
  79         .lower_margin   = 2,
  80         .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
  81 };
  82
  83 static struct pxafb_mach_info am200_fb_info = {
  84         .modes          = &am200_fb_mode_6inch,
  85         .num_modes      = 1,
  86         .lcd_conn       = LCD_TYPE_COLOR_TFT | LCD_PCLK_EDGE_FALL |
  87                           LCD_AC_BIAS_FREQ(24),
  88 };
  89
  90 /* register offsets for gpio control */
  91 #define LED_GPIO_PIN 51
  92 #define STDBY_GPIO_PIN 48
  93 #define RST_GPIO_PIN 49
  94 #define RDY_GPIO_PIN 32
  95 #define ERR_GPIO_PIN 17
  96 #define PCBPWR_GPIO_PIN 16
  97 static int gpios[] = { LED_GPIO_PIN , STDBY_GPIO_PIN , RST_GPIO_PIN,
  98                         RDY_GPIO_PIN, ERR_GPIO_PIN, PCBPWR_GPIO_PIN };
  99 static char *gpio_names[] = { "LED" , "STDBY" , "RST", "RDY", "ERR", "PCBPWR" };
 100
 101 static int am200_init_gpio_regs(struct metronomefb_par *par)
 102 {
 103         int i;
 104         int err;
 105
 106         for (i = 0; i < ARRAY_SIZE(gpios); i++) {
 107                 err = gpio_request(gpios[i], gpio_names[i]);
 108                 if (err) {
 109                         dev_err(&am200_device->dev, "failed requesting "
 110                                 "gpio %s, err=%d\n", gpio_names[i], err);
 111                         goto err_req_gpio;
 112                 }
 113         }
 114
 115         gpio_direction_output(LED_GPIO_PIN, 0);
 116         gpio_direction_output(STDBY_GPIO_PIN, 0);
 117         gpio_direction_output(RST_GPIO_PIN, 0);
 118
 119         gpio_direction_input(RDY_GPIO_PIN);
 120         gpio_direction_input(ERR_GPIO_PIN);
 121
 122         gpio_direction_output(PCBPWR_GPIO_PIN, 0);
 123
 124         return 0;
 125
 126 err_req_gpio:
 127         while (i > 0)
 128                 gpio_free(gpios[i--]);
 129
 130         return err;
 131 }
 132
 133 static void am200_cleanup(struct metronomefb_par *par)
 134 {
 135         int i;
 136
 137         free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
 138
 139         for (i = 0; i < ARRAY_SIZE(gpios); i++)
 140                 gpio_free(gpios[i]);
 141 }
 142
 143 static int am200_share_video_mem(struct fb_info *info)
 144 {
 145         /* rough check if this is our desired fb and not something else */
 146         if ((info->var.xres != am200_fb_info.modes->xres)
 147                 || (info->var.yres != am200_fb_info.modes->yres))
 148                 return 0;
 149
 150         /* we've now been notified that we have our new fb */
 151         am200_board.metromem = info->screen_base;
 152         am200_board.host_fbinfo = info;
 153
 154         /* try to refcount host drv since we are the consumer after this */
 155         if (!try_module_get(info->fbops->owner))
 156                 return -ENODEV;
 157
 158         return 0;
 159 }
 160
 161 static int am200_unshare_video_mem(struct fb_info *info)
 162 {
 163         dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
 164
 165         if (info != am200_board.host_fbinfo)
 166                 return 0;
 167
 168         module_put(am200_board.host_fbinfo->fbops->owner);
 169         return 0;
 170 }
 171
 172 static int am200_fb_notifier_callback(struct notifier_block *self,
 173                                  unsigned long event, void *data)
 174 {
 175         struct fb_event *evdata = data;
 176         struct fb_info *info = evdata->info;
 177
 178         dev_dbg(&am200_device->dev, "ENTER %s\n", __func__);
 179
 180         if (event == FB_EVENT_FB_REGISTERED)
 181                 return am200_share_video_mem(info);
 182         else if (event == FB_EVENT_FB_UNREGISTERED)
 183                 return am200_unshare_video_mem(info);
 184
 185         return 0;
 186 }
 187
 188 static struct notifier_block am200_fb_notif = {
 189         .notifier_call = am200_fb_notifier_callback,
 190 };
 191
 192 /* this gets called as part of our init. these steps must be done now so
 193  * that we can use set_pxa_fb_info */
 194 static void __init am200_presetup_fb(void)
 195 {
 196         int fw;
 197         int fh;
 198         int padding_size;
 199         int totalsize;
 200
 201         switch (panel_type) {
 202         case 6:
 203                 am200_fb_info.modes = &am200_fb_mode_6inch;
 204                 break;
 205         case 8:
 206                 am200_fb_info.modes = &am200_fb_mode_8inch;
 207                 break;
 208         case 97:
 209                 am200_fb_info.modes = &am200_fb_mode_9inch7;
 210                 break;
 211         default:
 212                 dev_err(&am200_device->dev, "invalid panel_type selection,"
 213                                                 " setting to 6\n");
 214                 am200_fb_info.modes = &am200_fb_mode_6inch;
 215                 break;
 216         }
 217
 218         /* the frame buffer is divided as follows:
 219         command | CRC | padding
 220         16kb waveform data | CRC | padding
 221         image data | CRC
 222         */
 223
 224         fw = am200_fb_info.modes->xres;
 225         fh = am200_fb_info.modes->yres;
 226
 227         /* waveform must be 16k + 2 for checksum */
 228         am200_board.wfm_size = roundup(16*1024 + 2, fw);
 229
 230         padding_size = PAGE_SIZE + (4 * fw);
 231
 232         /* total is 1 cmd , 1 wfm, padding and image */
 233         totalsize = fw + am200_board.wfm_size + padding_size + (fw*fh);
 234
 235         /* save this off because we're manipulating fw after this and
 236          * we'll need it when we're ready to setup the framebuffer */
 237         am200_board.fw = fw;
 238         am200_board.fh = fh;
 239
 240         /* the reason we do this adjustment is because we want to acquire
 241          * more framebuffer memory without imposing custom awareness on the
 242          * underlying pxafb driver */
 243         am200_fb_info.modes->yres = DIV_ROUND_UP(totalsize, fw);
 244
 245         /* we divide since we told the LCD controller we're 16bpp */
 246         am200_fb_info.modes->xres /= 2;
 247
 248         set_pxa_fb_info(&am200_fb_info);
 249
 250 }
 251
 252 /* this gets called by metronomefb as part of its init, in our case, we
 253  * have already completed initial framebuffer init in presetup_fb so we
 254  * can just setup the fb access pointers */
 255 static int am200_setup_fb(struct metronomefb_par *par)
 256 {
 257         int fw;
 258         int fh;
 259
 260         fw = am200_board.fw;
 261         fh = am200_board.fh;
 262
 263         /* metromem was set up by the notifier in share_video_mem so now
 264          * we can use its value to calculate the other entries */
 265         par->metromem_cmd = (struct metromem_cmd *) am200_board.metromem;
 266         par->metromem_wfm = am200_board.metromem + fw;
 267         par->metromem_img = par->metromem_wfm + am200_board.wfm_size;
 268         par->metromem_img_csum = (u16 *) (par->metromem_img + (fw * fh));
 269         par->metromem_dma = am200_board.host_fbinfo->fix.smem_start;
 270
 271         return 0;
 272 }
 273
 274 static int am200_get_panel_type(void)
 275 {
 276         return panel_type;
 277 }
 278
 279 static irqreturn_t am200_handle_irq(int irq, void *dev_id)
 280 {
 281         struct metronomefb_par *par = dev_id;
 282
 283         wake_up_interruptible(&par->waitq);
 284         return IRQ_HANDLED;
 285 }
 286
 287 static int am200_setup_irq(struct fb_info *info)
 288 {
 289         int ret;
 290
 291         ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am200_handle_irq,
 292                                 IRQF_DISABLED|IRQF_TRIGGER_FALLING,
 293                                 "AM200", info->par);
 294         if (ret)
 295                 dev_err(&am200_device->dev, "request_irq failed: %d\n", ret);
 296
 297         return ret;
 298 }
 299
 300 static void am200_set_rst(struct metronomefb_par *par, int state)
 301 {
 302         gpio_set_value(RST_GPIO_PIN, state);
 303 }
 304
 305 static void am200_set_stdby(struct metronomefb_par *par, int state)
 306 {
 307         gpio_set_value(STDBY_GPIO_PIN, state);
 308 }
 309
 310 static int am200_wait_event(struct metronomefb_par *par)
 311 {
 312         return wait_event_timeout(par->waitq, gpio_get_value(RDY_GPIO_PIN), HZ);
 313 }
 314
 315 static int am200_wait_event_intr(struct metronomefb_par *par)
 316 {
 317         return wait_event_interruptible_timeout(par->waitq,
 318                                         gpio_get_value(RDY_GPIO_PIN), HZ);
 319 }
 320
 321 static struct metronome_board am200_board = {
 322         .owner                  = THIS_MODULE,
 323         .setup_irq              = am200_setup_irq,
 324         .setup_io               = am200_init_gpio_regs,
 325         .setup_fb               = am200_setup_fb,
 326         .set_rst                = am200_set_rst,
 327         .set_stdby              = am200_set_stdby,
 328         .met_wait_event         = am200_wait_event,
 329         .met_wait_event_intr    = am200_wait_event_intr,
 330         .get_panel_type         = am200_get_panel_type,
 331         .cleanup                = am200_cleanup,
 332 };
 333
 334 static int __init am200_init(void)
 335 {
 336         int ret;
 337
 338         /* before anything else, we request notification for any fb
 339          * creation events */
 340         fb_register_client(&am200_fb_notif);
 341
 342         /* request our platform independent driver */
 343         request_module("metronomefb");
 344
 345         am200_device = platform_device_alloc("metronomefb", -1);
 346         if (!am200_device)
 347                 return -ENOMEM;
 348
 349         /* the am200_board that will be seen by metronomefb is a copy */
 350         platform_device_add_data(am200_device, &am200_board,
 351                                         sizeof(am200_board));
 352
 353         /* this _add binds metronomefb to am200. metronomefb refcounts am200 */
 354         ret = platform_device_add(am200_device);
 355
 356         if (ret) {
 357                 platform_device_put(am200_device);
 358                 fb_unregister_client(&am200_fb_notif);
 359                 return ret;
 360         }
 361
 362         am200_presetup_fb();
 363
 364         return 0;
 365 }
 366
 367 module_param(panel_type, uint, 0);
 368 MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
 369
 370 module_init(am200_init);
 371
 372 MODULE_DESCRIPTION("board driver for am200 metronome epd kit");
 373 MODULE_AUTHOR("Jaya Kumar");
 374 MODULE_LICENSE("GPL");