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