forked from luck/tmp_suning_uos_patched
da564a05b3
The main purpose of this patch is to fix several section mismatch warnings from the board file and a few board specific drivers, introduced with recent Amstrad Delta patch series, some of them rising up only when building with CONFIG_MODULES not set. While being at it, section tagging of all init data found in the board file have been revised and hopefully corrected and/or optimized. Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Tony Lindgren <tony@atomide.com>
192 lines
4.9 KiB
C
192 lines
4.9 KiB
C
/*
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* Amstrad E3 (Delta) keyboard port driver
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*
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* Copyright (c) 2006 Matt Callow
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* Copyright (c) 2010 Janusz Krzysztofik
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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 version 2 as published by
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* the Free Software Foundation.
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*
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* Thanks to Cliff Lawson for his help
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*
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* The Amstrad Delta keyboard (aka mailboard) uses normal PC-AT style serial
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* transmission. The keyboard port is formed of two GPIO lines, for clock
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* and data. Due to strict timing requirements of the interface,
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* the serial data stream is read and processed by a FIQ handler.
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* The resulting words are fetched by this driver from a circular buffer.
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*
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* Standard AT keyboard driver (atkbd) is used for handling the keyboard data.
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* However, when used with the E3 mailboard that producecs non-standard
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* scancodes, a custom key table must be prepared and loaded from userspace.
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*/
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/serio.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <asm/mach-types.h>
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#include <plat/board-ams-delta.h>
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#include <mach/ams-delta-fiq.h>
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MODULE_AUTHOR("Matt Callow");
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MODULE_DESCRIPTION("AMS Delta (E3) keyboard port driver");
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MODULE_LICENSE("GPL");
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static struct serio *ams_delta_serio;
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static int check_data(int data)
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{
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int i, parity = 0;
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/* check valid stop bit */
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if (!(data & 0x400)) {
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dev_warn(&ams_delta_serio->dev,
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"invalid stop bit, data=0x%X\n",
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data);
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return SERIO_FRAME;
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}
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/* calculate the parity */
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for (i = 1; i < 10; i++) {
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if (data & (1 << i))
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parity++;
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}
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/* it should be odd */
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if (!(parity & 0x01)) {
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dev_warn(&ams_delta_serio->dev,
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"paritiy check failed, data=0x%X parity=0x%X\n",
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data, parity);
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return SERIO_PARITY;
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}
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return 0;
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}
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static irqreturn_t ams_delta_serio_interrupt(int irq, void *dev_id)
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{
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int *circ_buff = &fiq_buffer[FIQ_CIRC_BUFF];
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int data, dfl;
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u8 scancode;
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fiq_buffer[FIQ_IRQ_PEND] = 0;
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/*
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* Read data from the circular buffer, check it
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* and then pass it on the serio
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*/
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while (fiq_buffer[FIQ_KEYS_CNT] > 0) {
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data = circ_buff[fiq_buffer[FIQ_HEAD_OFFSET]++];
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fiq_buffer[FIQ_KEYS_CNT]--;
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if (fiq_buffer[FIQ_HEAD_OFFSET] == fiq_buffer[FIQ_BUF_LEN])
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fiq_buffer[FIQ_HEAD_OFFSET] = 0;
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dfl = check_data(data);
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scancode = (u8) (data >> 1) & 0xFF;
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serio_interrupt(ams_delta_serio, scancode, dfl);
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}
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return IRQ_HANDLED;
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}
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static int ams_delta_serio_open(struct serio *serio)
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{
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/* enable keyboard */
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gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 1);
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return 0;
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}
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static void ams_delta_serio_close(struct serio *serio)
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{
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/* disable keyboard */
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gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 0);
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}
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static const struct gpio ams_delta_gpios[] __initconst_or_module = {
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{
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.gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATA,
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.flags = GPIOF_DIR_IN,
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.label = "serio-data",
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},
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{
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.gpio = AMS_DELTA_GPIO_PIN_KEYBRD_CLK,
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.flags = GPIOF_DIR_IN,
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.label = "serio-clock",
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},
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{
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.gpio = AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
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.flags = GPIOF_OUT_INIT_LOW,
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.label = "serio-power",
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},
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{
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.gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
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.flags = GPIOF_OUT_INIT_LOW,
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.label = "serio-dataout",
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},
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};
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static int __init ams_delta_serio_init(void)
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{
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int err;
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if (!machine_is_ams_delta())
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return -ENODEV;
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ams_delta_serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!ams_delta_serio)
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return -ENOMEM;
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ams_delta_serio->id.type = SERIO_8042;
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ams_delta_serio->open = ams_delta_serio_open;
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ams_delta_serio->close = ams_delta_serio_close;
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strlcpy(ams_delta_serio->name, "AMS DELTA keyboard adapter",
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sizeof(ams_delta_serio->name));
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strlcpy(ams_delta_serio->phys, "GPIO/serio0",
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sizeof(ams_delta_serio->phys));
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err = gpio_request_array(ams_delta_gpios,
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ARRAY_SIZE(ams_delta_gpios));
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if (err) {
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pr_err("ams_delta_serio: Couldn't request gpio pins\n");
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goto serio;
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}
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err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
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ams_delta_serio_interrupt, IRQ_TYPE_EDGE_RISING,
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"ams-delta-serio", 0);
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if (err < 0) {
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pr_err("ams_delta_serio: couldn't request gpio interrupt %d\n",
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gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK));
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goto gpio;
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}
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/*
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* Since GPIO register handling for keyboard clock pin is performed
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* at FIQ level, switch back from edge to simple interrupt handler
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* to avoid bad interaction.
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*/
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irq_set_handler(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
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handle_simple_irq);
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serio_register_port(ams_delta_serio);
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dev_info(&ams_delta_serio->dev, "%s\n", ams_delta_serio->name);
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return 0;
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gpio:
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gpio_free_array(ams_delta_gpios,
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ARRAY_SIZE(ams_delta_gpios));
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serio:
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kfree(ams_delta_serio);
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return err;
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}
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module_init(ams_delta_serio_init);
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static void __exit ams_delta_serio_exit(void)
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{
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serio_unregister_port(ams_delta_serio);
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free_irq(OMAP_GPIO_IRQ(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
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gpio_free_array(ams_delta_gpios,
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ARRAY_SIZE(ams_delta_gpios));
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}
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module_exit(ams_delta_serio_exit);
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