--- /dev/null
+/*
+ * am300epd.c -- Platform device for AM300 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.
+ *
+ * This work was made possible by help and equipment support from E-Ink
+ * Corporation. http://support.eink.com/community
+ *
+ * This driver is written to be used with the Broadsheet display controller.
+ * on the AM300 EPD prototype kit/development kit with an E-Ink 800x600
+ * Vizplex EPD on a Gumstix board using the Broadsheet interface board.
+ *
+ */
+
+#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/irq.h>
+#include <linux/gpio.h>
+
+#include <mach/gumstix.h>
+#include <mach/mfp-pxa25x.h>
+#include <mach/pxafb.h>
+
+#include "generic.h"
+
+#include <video/broadsheetfb.h>
+
+static unsigned int panel_type = 6;
+static struct platform_device *am300_device;
+static struct broadsheet_board am300_board;
+
+static unsigned long am300_pin_config[] __initdata = {
+ GPIO16_GPIO,
+ GPIO17_GPIO,
+ GPIO32_GPIO,
+ GPIO48_GPIO,
+ GPIO49_GPIO,
+ GPIO51_GPIO,
+ GPIO74_GPIO,
+ GPIO75_GPIO,
+ GPIO76_GPIO,
+ GPIO77_GPIO,
+
+ /* this is the 16-bit hdb bus 58-73 */
+ GPIO58_GPIO,
+ GPIO59_GPIO,
+ GPIO60_GPIO,
+ GPIO61_GPIO,
+
+ GPIO62_GPIO,
+ GPIO63_GPIO,
+ GPIO64_GPIO,
+ GPIO65_GPIO,
+
+ GPIO66_GPIO,
+ GPIO67_GPIO,
+ GPIO68_GPIO,
+ GPIO69_GPIO,
+
+ GPIO70_GPIO,
+ GPIO71_GPIO,
+ GPIO72_GPIO,
+ GPIO73_GPIO,
+};
+
+/* register offsets for gpio control */
+#define PWR_GPIO_PIN 16
+#define CFG_GPIO_PIN 17
+#define RDY_GPIO_PIN 32
+#define DC_GPIO_PIN 48
+#define RST_GPIO_PIN 49
+#define LED_GPIO_PIN 51
+#define RD_GPIO_PIN 74
+#define WR_GPIO_PIN 75
+#define CS_GPIO_PIN 76
+#define IRQ_GPIO_PIN 77
+
+/* hdb bus */
+#define DB0_GPIO_PIN 58
+#define DB15_GPIO_PIN 73
+
+static int gpios[] = { PWR_GPIO_PIN, CFG_GPIO_PIN, RDY_GPIO_PIN, DC_GPIO_PIN,
+ RST_GPIO_PIN, RD_GPIO_PIN, WR_GPIO_PIN, CS_GPIO_PIN,
+ IRQ_GPIO_PIN, LED_GPIO_PIN };
+static char *gpio_names[] = { "PWR", "CFG", "RDY", "DC", "RST", "RD", "WR",
+ "CS", "IRQ", "LED" };
+
+static int am300_wait_event(struct broadsheetfb_par *par)
+{
+ /* todo: improve err recovery */
+ wait_event(par->waitq, gpio_get_value(RDY_GPIO_PIN));
+ return 0;
+}
+
+static int am300_init_gpio_regs(struct broadsheetfb_par *par)
+{
+ int i;
+ int err;
+ char dbname[8];
+
+ for (i = 0; i < ARRAY_SIZE(gpios); i++) {
+ err = gpio_request(gpios[i], gpio_names[i]);
+ if (err) {
+ dev_err(&am300_device->dev, "failed requesting "
+ "gpio %s, err=%d\n", gpio_names[i], err);
+ goto err_req_gpio;
+ }
+ }
+
+ /* we also need to take care of the hdb bus */
+ for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++) {
+ sprintf(dbname, "DB%d", i);
+ err = gpio_request(i, dbname);
+ if (err) {
+ dev_err(&am300_device->dev, "failed requesting "
+ "gpio %d, err=%d\n", i, err);
+ while (i >= DB0_GPIO_PIN)
+ gpio_free(i--);
+ i = ARRAY_SIZE(gpios) - 1;
+ goto err_req_gpio;
+ }
+ }
+
+ /* setup the outputs and init values */
+ gpio_direction_output(PWR_GPIO_PIN, 0);
+ gpio_direction_output(CFG_GPIO_PIN, 1);
+ gpio_direction_output(DC_GPIO_PIN, 0);
+ gpio_direction_output(RD_GPIO_PIN, 1);
+ gpio_direction_output(WR_GPIO_PIN, 1);
+ gpio_direction_output(CS_GPIO_PIN, 1);
+ gpio_direction_output(RST_GPIO_PIN, 0);
+
+ /* setup the inputs */
+ gpio_direction_input(RDY_GPIO_PIN);
+ gpio_direction_input(IRQ_GPIO_PIN);
+
+ /* start the hdb bus as an input */
+ for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
+ gpio_direction_output(i, 0);
+
+ /* go into command mode */
+ gpio_set_value(CFG_GPIO_PIN, 1);
+ gpio_set_value(RST_GPIO_PIN, 0);
+ msleep(10);
+ gpio_set_value(RST_GPIO_PIN, 1);
+ msleep(10);
+ am300_wait_event(par);
+
+ return 0;
+
+err_req_gpio:
+ while (i > 0)
+ gpio_free(gpios[i--]);
+
+ return err;
+}
+
+static int am300_init_board(struct broadsheetfb_par *par)
+{
+ return am300_init_gpio_regs(par);
+}
+
+static void am300_cleanup(struct broadsheetfb_par *par)
+{
+ int i;
+
+ free_irq(IRQ_GPIO(RDY_GPIO_PIN), par);
+
+ for (i = 0; i < ARRAY_SIZE(gpios); i++)
+ gpio_free(gpios[i]);
+
+ for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
+ gpio_free(i);
+
+}
+
+static u16 am300_get_hdb(struct broadsheetfb_par *par)
+{
+ u16 res = 0;
+ int i;
+
+ for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
+ res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
+
+ return res;
+}
+
+static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
+{
+ int i;
+
+ for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
+ gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
+}
+
+
+static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
+ u8 state)
+{
+ switch (bit) {
+ case BS_CS:
+ gpio_set_value(CS_GPIO_PIN, state);
+ break;
+ case BS_DC:
+ gpio_set_value(DC_GPIO_PIN, state);
+ break;
+ case BS_WR:
+ gpio_set_value(WR_GPIO_PIN, state);
+ break;
+ }
+}
+
+static int am300_get_panel_type(void)
+{
+ return panel_type;
+}
+
+static irqreturn_t am300_handle_irq(int irq, void *dev_id)
+{
+ struct broadsheetfb_par *par = dev_id;
+
+ wake_up(&par->waitq);
+ return IRQ_HANDLED;
+}
+
+static int am300_setup_irq(struct fb_info *info)
+{
+ int ret;
+ struct broadsheetfb_par *par = info->par;
+
+ ret = request_irq(IRQ_GPIO(RDY_GPIO_PIN), am300_handle_irq,
+ IRQF_DISABLED|IRQF_TRIGGER_RISING,
+ "AM300", par);
+ if (ret)
+ dev_err(&am300_device->dev, "request_irq failed: %d\n", ret);
+
+ return ret;
+}
+
+static struct broadsheet_board am300_board = {
+ .owner = THIS_MODULE,
+ .init = am300_init_board,
+ .cleanup = am300_cleanup,
+ .set_hdb = am300_set_hdb,
+ .get_hdb = am300_get_hdb,
+ .set_ctl = am300_set_ctl,
+ .wait_for_rdy = am300_wait_event,
+ .get_panel_type = am300_get_panel_type,
+ .setup_irq = am300_setup_irq,
+};
+
+int __init am300_init(void)
+{
+ int ret;
+
+ pxa2xx_mfp_config(ARRAY_AND_SIZE(am300_pin_config));
+
+ /* request our platform independent driver */
+ request_module("broadsheetfb");
+
+ am300_device = platform_device_alloc("broadsheetfb", -1);
+ if (!am300_device)
+ return -ENOMEM;
+
+ /* the am300_board that will be seen by broadsheetfb is a copy */
+ platform_device_add_data(am300_device, &am300_board,
+ sizeof(am300_board));
+
+ ret = platform_device_add(am300_device);
+
+ if (ret) {
+ platform_device_put(am300_device);
+ return ret;
+ }
+
+ return 0;
+}
+
+module_param(panel_type, uint, 0);
+MODULE_PARM_DESC(panel_type, "Select the panel type: 6, 8, 97");
+
+MODULE_DESCRIPTION("board driver for am300 epd kit");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
projects / platform / kernel / linux-rpi.git / commitdiff