2010-09-25 02:13:42 +00:00
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/*
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* Mainly by David Woodhouse, somewhat modified by Jordan Crouse
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*
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* Copyright © 2006-2007 Red Hat, Inc.
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* Copyright © 2006-2007 Advanced Micro Devices, Inc.
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* Copyright © 2009 VIA Technology, Inc.
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* Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
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*
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* This program is free software. You can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/fb.h>
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#include <linux/console.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/backlight.h>
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#include <linux/device.h>
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#include <linux/notifier.h>
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2011-02-03 15:22:52 +00:00
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#include <linux/uaccess.h>
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2010-09-25 02:13:42 +00:00
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#include <linux/ctype.h>
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#include <linux/reboot.h>
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#include <asm/tsc.h>
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#include <asm/olpc.h>
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#include "olpc_dcon.h"
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/* Module definitions */
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static int resumeline = 898;
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module_param(resumeline, int, 0444);
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static int noinit;
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module_param(noinit, int, 0444);
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/* Default off since it doesn't work on DCON ASIC in B-test OLPC board */
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static int useaa = 1;
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module_param(useaa, int, 0444);
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struct dcon_platform_data {
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int (*init)(void);
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void (*bus_stabilize_wiggle)(void);
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void (*set_dconload)(int);
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2011-01-13 01:00:11 +00:00
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u8 (*read_status)(void);
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2010-09-25 02:13:42 +00:00
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};
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static struct dcon_platform_data *pdata;
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/* I2C structures */
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static struct i2c_driver dcon_driver;
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static struct i2c_client *dcon_client;
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/* Platform devices */
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static struct platform_device *dcon_device;
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/* Backlight device */
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static struct backlight_device *dcon_bl_dev;
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static struct fb_info *fbinfo;
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/* set this to 1 while controlling fb blank state from this driver */
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static int ignore_fb_events = 0;
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/* Current source, initialized at probe time */
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static int dcon_source;
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/* Desired source */
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static int dcon_pending;
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/* Current output type */
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static int dcon_output = DCON_OUTPUT_COLOR;
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/* Current sleep status (not yet implemented) */
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static int dcon_sleep_val = DCON_ACTIVE;
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/* Shadow register for the DCON_REG_MODE register */
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static unsigned short dcon_disp_mode;
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/* Variables used during switches */
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static int dcon_switched;
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static struct timespec dcon_irq_time;
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2011-02-03 15:22:52 +00:00
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static struct timespec dcon_load_time;
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2010-09-25 02:13:42 +00:00
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static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue);
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static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
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2011-02-03 15:22:52 +00:00
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#define dcon_write(reg, val) i2c_smbus_write_word_data(dcon_client, reg, val)
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#define dcon_read(reg) i2c_smbus_read_word_data(dcon_client, reg)
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2010-09-25 02:13:42 +00:00
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/* The current backlight value - this saves us some smbus traffic */
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static int bl_val = -1;
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/* ===== API functions - these are called by a variety of users ==== */
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static int dcon_hw_init(struct i2c_client *client, int is_init)
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{
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uint16_t ver;
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int rc = 0;
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ver = i2c_smbus_read_word_data(client, DCON_REG_ID);
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if ((ver >> 8) != 0xDC) {
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printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x "
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"instead.\n", ver);
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rc = -ENXIO;
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goto err;
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}
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if (is_init) {
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printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n",
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ver & 0xFF);
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2011-02-03 15:22:52 +00:00
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rc = pdata->init();
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if (rc != 0) {
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2010-09-25 02:13:42 +00:00
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printk(KERN_ERR "olpc-dcon: Unable to init.\n");
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goto err;
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}
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}
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if (ver < 0xdc02 && !noinit) {
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/* Initialize the DCON registers */
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/* Start with work-arounds for DCON ASIC */
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i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
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i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
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i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
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i2c_smbus_write_word_data(client, 0x0b, 0x007a);
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i2c_smbus_write_word_data(client, 0x36, 0x025c);
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i2c_smbus_write_word_data(client, 0x37, 0x025e);
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2011-02-03 15:22:52 +00:00
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2010-09-25 02:13:42 +00:00
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/* Initialise SDRAM */
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i2c_smbus_write_word_data(client, 0x3b, 0x002b);
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i2c_smbus_write_word_data(client, 0x41, 0x0101);
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i2c_smbus_write_word_data(client, 0x42, 0x0101);
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2011-02-03 15:22:52 +00:00
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} else if (!noinit) {
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2010-09-25 02:13:42 +00:00
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/* SDRAM setup/hold time */
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i2c_smbus_write_word_data(client, 0x3a, 0xc040);
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i2c_smbus_write_word_data(client, 0x41, 0x0000);
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i2c_smbus_write_word_data(client, 0x41, 0x0101);
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i2c_smbus_write_word_data(client, 0x42, 0x0101);
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}
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/* Colour swizzle, AA, no passthrough, backlight */
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if (is_init) {
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dcon_disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | MODE_CSWIZZLE;
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if (useaa)
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dcon_disp_mode |= MODE_COL_AA;
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}
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i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon_disp_mode);
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/* Set the scanline to interrupt on during resume */
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i2c_smbus_write_word_data(client, DCON_REG_SCAN_INT, resumeline);
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err:
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return rc;
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}
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/*
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* The smbus doesn't always come back due to what is believed to be
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* hardware (power rail) bugs. For older models where this is known to
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* occur, our solution is to attempt to wait for the bus to stabilize;
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* if it doesn't happen, cut power to the dcon, repower it, and wait
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* for the bus to stabilize. Rinse, repeat until we have a working
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* smbus. For newer models, we simply BUG(); we want to know if this
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* still happens despite the power fixes that have been made!
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*/
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static int dcon_bus_stabilize(struct i2c_client *client, int is_powered_down)
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{
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unsigned long timeout;
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int x;
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power_up:
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if (is_powered_down) {
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x = 1;
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2011-02-03 15:22:52 +00:00
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x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0);
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if (x) {
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2010-09-25 02:13:42 +00:00
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printk(KERN_WARNING "olpc-dcon: unable to force dcon "
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"to power up: %d!\n", x);
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return x;
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}
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msleep(10); /* we'll be conservative */
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}
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2011-02-03 15:22:52 +00:00
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2010-09-25 02:13:42 +00:00
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pdata->bus_stabilize_wiggle();
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for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
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msleep(1);
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x = dcon_read(DCON_REG_ID);
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}
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if (x < 0) {
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printk(KERN_ERR "olpc-dcon: unable to stabilize dcon's "
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"smbus, reasserting power and praying.\n");
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2010-09-25 02:14:09 +00:00
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BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
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2010-09-25 02:13:42 +00:00
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x = 0;
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olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0);
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msleep(100);
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is_powered_down = 1;
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goto power_up; /* argh, stupid hardware.. */
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}
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if (is_powered_down)
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return dcon_hw_init(client, 0);
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return 0;
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}
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static int dcon_get_backlight(void)
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{
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if (dcon_client == NULL)
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return 0;
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if (bl_val == -1)
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bl_val = dcon_read(DCON_REG_BRIGHT) & 0x0F;
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return bl_val;
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}
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static void dcon_set_backlight_hw(int level)
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{
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bl_val = level & 0x0F;
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dcon_write(DCON_REG_BRIGHT, bl_val);
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/* Purposely turn off the backlight when we go to level 0 */
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if (bl_val == 0) {
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dcon_disp_mode &= ~MODE_BL_ENABLE;
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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} else if (!(dcon_disp_mode & MODE_BL_ENABLE)) {
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dcon_disp_mode |= MODE_BL_ENABLE;
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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}
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}
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static void dcon_set_backlight(int level)
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{
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if (dcon_client == NULL)
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return;
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if (bl_val == (level & 0x0F))
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return;
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dcon_set_backlight_hw(level);
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}
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/* Set the output type to either color or mono */
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static int dcon_set_output(int arg)
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{
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if (dcon_output == arg)
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return 0;
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dcon_output = arg;
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if (arg == DCON_OUTPUT_MONO) {
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dcon_disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
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dcon_disp_mode |= MODE_MONO_LUMA;
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2011-02-03 15:22:52 +00:00
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} else {
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2010-09-25 02:13:42 +00:00
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dcon_disp_mode &= ~(MODE_MONO_LUMA);
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dcon_disp_mode |= MODE_CSWIZZLE;
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if (useaa)
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dcon_disp_mode |= MODE_COL_AA;
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}
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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return 0;
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}
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/* For now, this will be really stupid - we need to address how
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* DCONLOAD works in a sleep and account for it accordingly
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*/
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static void dcon_sleep(int state)
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{
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int x;
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/* Turn off the backlight and put the DCON to sleep */
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if (state == dcon_sleep_val)
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return;
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2010-09-25 02:14:09 +00:00
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if (!olpc_board_at_least(olpc_board(0xc2)))
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2010-09-25 02:13:42 +00:00
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return;
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if (state == DCON_SLEEP) {
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x = 0;
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2011-02-03 15:22:52 +00:00
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x = olpc_ec_cmd(0x26, (unsigned char *) &x, 1, NULL, 0);
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if (x)
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2010-09-25 02:13:42 +00:00
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printk(KERN_WARNING "olpc-dcon: unable to force dcon "
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"to power down: %d!\n", x);
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else
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dcon_sleep_val = state;
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2011-02-03 15:22:52 +00:00
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} else {
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2010-09-25 02:13:42 +00:00
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/* Only re-enable the backlight if the backlight value is set */
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if (bl_val != 0)
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dcon_disp_mode |= MODE_BL_ENABLE;
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2011-02-03 15:22:52 +00:00
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x = dcon_bus_stabilize(dcon_client, 1);
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if (x)
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2010-09-25 02:13:42 +00:00
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printk(KERN_WARNING "olpc-dcon: unable to reinit dcon"
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" hardware: %d!\n", x);
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else
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dcon_sleep_val = state;
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/* Restore backlight */
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dcon_set_backlight_hw(bl_val);
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}
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/* We should turn off some stuff in the framebuffer - but what? */
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}
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/* the DCON seems to get confused if we change DCONLOAD too
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2011-02-03 15:22:52 +00:00
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* frequently -- i.e., approximately faster than frame time.
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2010-09-25 02:13:42 +00:00
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* normally we don't change it this fast, so in general we won't
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* delay here.
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*/
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void dcon_load_holdoff(void)
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{
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struct timespec delta_t, now;
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2011-02-03 15:22:52 +00:00
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while (1) {
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2010-09-25 02:13:42 +00:00
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getnstimeofday(&now);
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delta_t = timespec_sub(now, dcon_load_time);
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if (delta_t.tv_sec != 0 ||
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delta_t.tv_nsec > NSEC_PER_MSEC * 20) {
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break;
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}
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mdelay(4);
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}
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}
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/* Set the source of the display (CPU or DCON) */
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static void dcon_source_switch(struct work_struct *work)
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{
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DECLARE_WAITQUEUE(wait, current);
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int source = dcon_pending;
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if (dcon_source == source)
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return;
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|
|
|
|
|
|
|
dcon_load_holdoff();
|
|
|
|
|
|
|
|
dcon_switched = 0;
|
|
|
|
|
|
|
|
switch (source) {
|
|
|
|
case DCON_SOURCE_CPU:
|
|
|
|
printk("dcon_source_switch to CPU\n");
|
|
|
|
/* Enable the scanline interrupt bit */
|
|
|
|
if (dcon_write(DCON_REG_MODE, dcon_disp_mode | MODE_SCAN_INT))
|
2011-02-03 15:22:52 +00:00
|
|
|
printk(KERN_ERR
|
|
|
|
"olpc-dcon: couldn't enable scanline interrupt!\n");
|
2010-09-25 02:13:42 +00:00
|
|
|
else {
|
|
|
|
/* Wait up to one second for the scanline interrupt */
|
2011-02-03 15:22:52 +00:00
|
|
|
wait_event_timeout(dcon_wait_queue,
|
|
|
|
dcon_switched == 1, HZ);
|
2010-09-25 02:13:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (!dcon_switched)
|
|
|
|
printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n");
|
|
|
|
|
|
|
|
/* Turn off the scanline interrupt */
|
|
|
|
if (dcon_write(DCON_REG_MODE, dcon_disp_mode))
|
|
|
|
printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n");
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ideally we'd like to disable interrupts here so that the
|
|
|
|
* fb unblanking and DCON turn on happen at a known time value;
|
|
|
|
* however, we can't do that right now with fb_blank
|
|
|
|
* messing with semaphores.
|
|
|
|
*
|
|
|
|
* For now, we just hope..
|
|
|
|
*/
|
2011-01-25 23:07:35 +00:00
|
|
|
console_lock();
|
2010-09-25 02:13:42 +00:00
|
|
|
ignore_fb_events = 1;
|
|
|
|
if (fb_blank(fbinfo, FB_BLANK_UNBLANK)) {
|
|
|
|
ignore_fb_events = 0;
|
2011-01-25 23:07:35 +00:00
|
|
|
console_unlock();
|
2010-09-25 02:13:42 +00:00
|
|
|
printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n");
|
|
|
|
dcon_pending = DCON_SOURCE_DCON;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
ignore_fb_events = 0;
|
2011-01-25 23:07:35 +00:00
|
|
|
console_unlock();
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
/* And turn off the DCON */
|
|
|
|
pdata->set_dconload(1);
|
|
|
|
getnstimeofday(&dcon_load_time);
|
|
|
|
|
|
|
|
printk(KERN_INFO "olpc-dcon: The CPU has control\n");
|
|
|
|
break;
|
|
|
|
case DCON_SOURCE_DCON:
|
|
|
|
{
|
|
|
|
int t;
|
|
|
|
struct timespec delta_t;
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
printk(KERN_INFO "dcon_source_switch to DCON\n");
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
add_wait_queue(&dcon_wait_queue, &wait);
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
|
|
|
|
/* Clear DCONLOAD - this implies that the DCON is in control */
|
|
|
|
pdata->set_dconload(0);
|
|
|
|
getnstimeofday(&dcon_load_time);
|
|
|
|
|
|
|
|
t = schedule_timeout(HZ/2);
|
|
|
|
remove_wait_queue(&dcon_wait_queue, &wait);
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
|
|
|
|
if (!dcon_switched) {
|
|
|
|
printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n");
|
|
|
|
} else {
|
|
|
|
/* sometimes the DCON doesn't follow its own rules,
|
|
|
|
* and doesn't wait for two vsync pulses before
|
|
|
|
* ack'ing the frame load with an IRQ. the result
|
|
|
|
* is that the display shows the *previously*
|
|
|
|
* loaded frame. we can detect this by looking at
|
|
|
|
* the time between asserting DCONLOAD and the IRQ --
|
|
|
|
* if it's less than 20msec, then the DCON couldn't
|
|
|
|
* have seen two VSYNC pulses. in that case we
|
2011-02-03 15:22:52 +00:00
|
|
|
* deassert and reassert, and hope for the best.
|
2010-09-25 02:13:42 +00:00
|
|
|
* see http://dev.laptop.org/ticket/9664
|
|
|
|
*/
|
|
|
|
delta_t = timespec_sub(dcon_irq_time, dcon_load_time);
|
|
|
|
if (dcon_switched && delta_t.tv_sec == 0 &&
|
|
|
|
delta_t.tv_nsec < NSEC_PER_MSEC * 20) {
|
|
|
|
printk(KERN_ERR "olpc-dcon: missed loading, retrying\n");
|
|
|
|
pdata->set_dconload(1);
|
|
|
|
mdelay(41);
|
|
|
|
pdata->set_dconload(0);
|
|
|
|
getnstimeofday(&dcon_load_time);
|
|
|
|
mdelay(41);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-01-25 23:07:35 +00:00
|
|
|
console_lock();
|
2010-09-25 02:13:42 +00:00
|
|
|
ignore_fb_events = 1;
|
|
|
|
if (fb_blank(fbinfo, FB_BLANK_POWERDOWN))
|
|
|
|
printk(KERN_ERR "olpc-dcon: couldn't blank fb!\n");
|
|
|
|
ignore_fb_events = 0;
|
2011-01-25 23:07:35 +00:00
|
|
|
console_unlock();
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
printk(KERN_INFO "olpc-dcon: The DCON has control\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
|
|
|
|
dcon_source = source;
|
|
|
|
}
|
|
|
|
|
|
|
|
static DECLARE_WORK(dcon_work, dcon_source_switch);
|
|
|
|
|
|
|
|
static void dcon_set_source(int arg)
|
|
|
|
{
|
|
|
|
if (dcon_pending == arg)
|
|
|
|
return;
|
|
|
|
|
|
|
|
dcon_pending = arg;
|
|
|
|
|
|
|
|
if ((dcon_source != arg) && !work_pending(&dcon_work))
|
|
|
|
schedule_work(&dcon_work);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dcon_set_source_sync(int arg)
|
|
|
|
{
|
|
|
|
dcon_set_source(arg);
|
|
|
|
flush_scheduled_work();
|
|
|
|
}
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
static int dconbl_set(struct backlight_device *dev)
|
|
|
|
{
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
int level = dev->props.brightness;
|
|
|
|
|
|
|
|
if (dev->props.power != FB_BLANK_UNBLANK)
|
|
|
|
level = 0;
|
|
|
|
|
|
|
|
dcon_set_backlight(level);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
static int dconbl_get(struct backlight_device *dev)
|
|
|
|
{
|
2010-09-25 02:13:42 +00:00
|
|
|
return dcon_get_backlight();
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_mode_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
return sprintf(buf, "%4.4X\n", dcon_disp_mode);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_sleep_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
|
|
|
|
return sprintf(buf, "%d\n", dcon_sleep_val);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_freeze_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
return sprintf(buf, "%d\n", dcon_source == DCON_SOURCE_DCON ? 1 : 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_output_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
return sprintf(buf, "%d\n", dcon_output);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_resumeline_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
|
|
|
{
|
|
|
|
return sprintf(buf, "%d\n", resumeline);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int _strtoul(const char *buf, int len, unsigned int *val)
|
|
|
|
{
|
|
|
|
|
|
|
|
char *endp;
|
2011-02-03 15:22:52 +00:00
|
|
|
unsigned int output = strict_strtoul(buf, &endp, 0);
|
2010-09-25 02:13:42 +00:00
|
|
|
int size = endp - buf;
|
|
|
|
|
|
|
|
if (*endp && isspace(*endp))
|
|
|
|
size++;
|
|
|
|
|
|
|
|
if (size != len)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
*val = output;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_output_store(struct device *dev,
|
|
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
int output;
|
|
|
|
int rc = -EINVAL;
|
|
|
|
|
|
|
|
if (_strtoul(buf, count, &output))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (output == DCON_OUTPUT_COLOR || output == DCON_OUTPUT_MONO) {
|
|
|
|
dcon_set_output(output);
|
|
|
|
rc = count;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_freeze_store(struct device *dev,
|
|
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
int output;
|
|
|
|
|
|
|
|
if (_strtoul(buf, count, &output))
|
|
|
|
return -EINVAL;
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
printk(KERN_INFO "dcon_freeze_store: %d\n", output);
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
switch (output) {
|
|
|
|
case 0:
|
|
|
|
dcon_set_source(DCON_SOURCE_CPU);
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
dcon_set_source_sync(DCON_SOURCE_DCON);
|
|
|
|
break;
|
2011-02-03 15:22:52 +00:00
|
|
|
case 2: /* normally unused */
|
2010-09-25 02:13:42 +00:00
|
|
|
dcon_set_source(DCON_SOURCE_DCON);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_resumeline_store(struct device *dev,
|
|
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
int rl;
|
|
|
|
int rc = -EINVAL;
|
|
|
|
|
|
|
|
if (_strtoul(buf, count, &rl))
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
resumeline = rl;
|
|
|
|
dcon_write(DCON_REG_SCAN_INT, resumeline);
|
|
|
|
rc = count;
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t dcon_sleep_store(struct device *dev,
|
|
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
int output;
|
|
|
|
|
|
|
|
if (_strtoul(buf, count, &output))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
dcon_sleep(output ? DCON_SLEEP : DCON_ACTIVE);
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct device_attribute dcon_device_files[] = {
|
|
|
|
__ATTR(mode, 0444, dcon_mode_show, NULL),
|
|
|
|
__ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
|
|
|
|
__ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
|
|
|
|
__ATTR(output, 0644, dcon_output_show, dcon_output_store),
|
|
|
|
__ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
|
|
|
|
};
|
|
|
|
|
2010-11-16 13:14:02 +00:00
|
|
|
static const struct backlight_ops dcon_bl_ops = {
|
2010-09-25 02:13:42 +00:00
|
|
|
.get_brightness = dconbl_get,
|
|
|
|
.update_status = dconbl_set
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
static int dcon_reboot_notify(struct notifier_block *nb,
|
|
|
|
unsigned long foo, void *bar)
|
2010-09-25 02:13:42 +00:00
|
|
|
{
|
|
|
|
if (dcon_client == NULL)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* Turn off the DCON. Entirely. */
|
|
|
|
dcon_write(DCON_REG_MODE, 0x39);
|
|
|
|
dcon_write(DCON_REG_MODE, 0x32);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block dcon_nb = {
|
|
|
|
.notifier_call = dcon_reboot_notify,
|
|
|
|
.priority = -1,
|
|
|
|
};
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
static int unfreeze_on_panic(struct notifier_block *nb,
|
|
|
|
unsigned long e, void *p)
|
2010-09-25 02:13:42 +00:00
|
|
|
{
|
|
|
|
pdata->set_dconload(1);
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block dcon_panic_nb = {
|
|
|
|
.notifier_call = unfreeze_on_panic,
|
|
|
|
};
|
|
|
|
|
2010-09-26 02:06:30 +00:00
|
|
|
/*
|
|
|
|
* When the framebuffer sleeps due to external sources (e.g. user idle), power
|
|
|
|
* down the DCON as well. Power it back up when the fb comes back to life.
|
|
|
|
*/
|
2011-02-03 15:22:52 +00:00
|
|
|
static int fb_notifier_callback(struct notifier_block *self,
|
|
|
|
unsigned long event, void *data)
|
2010-09-25 02:13:42 +00:00
|
|
|
{
|
|
|
|
struct fb_event *evdata = data;
|
|
|
|
int *blank = (int *) evdata->data;
|
2010-09-26 02:06:30 +00:00
|
|
|
if (((event != FB_EVENT_BLANK) && (event != FB_EVENT_CONBLANK)) ||
|
|
|
|
ignore_fb_events)
|
2010-09-25 02:13:42 +00:00
|
|
|
return 0;
|
|
|
|
dcon_sleep((*blank) ? DCON_SLEEP : DCON_ACTIVE);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block fb_nb = {
|
|
|
|
.notifier_call = fb_notifier_callback,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int dcon_detect(struct i2c_client *client, struct i2c_board_info *info)
|
|
|
|
{
|
|
|
|
strlcpy(info->type, "olpc_dcon", I2C_NAME_SIZE);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dcon_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
|
|
|
{
|
2011-02-03 13:22:08 +00:00
|
|
|
int rc, i, j;
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
if (num_registered_fb >= 1)
|
|
|
|
fbinfo = registered_fb[0];
|
|
|
|
|
|
|
|
rc = dcon_hw_init(client, 1);
|
|
|
|
if (rc)
|
|
|
|
goto einit;
|
|
|
|
|
|
|
|
/* Add the DCON device */
|
|
|
|
|
|
|
|
dcon_device = platform_device_alloc("dcon", -1);
|
|
|
|
|
|
|
|
if (dcon_device == NULL) {
|
2011-02-03 15:22:52 +00:00
|
|
|
printk(KERN_ERR "dcon: Unable to create the DCON device\n");
|
2010-09-25 02:13:42 +00:00
|
|
|
rc = -ENOMEM;
|
|
|
|
goto eirq;
|
|
|
|
}
|
|
|
|
/* Place holder...*/
|
|
|
|
i2c_set_clientdata(client, dcon_device);
|
2011-02-03 15:22:52 +00:00
|
|
|
rc = platform_device_add(dcon_device);
|
2010-09-25 02:13:42 +00:00
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
if (rc) {
|
|
|
|
printk(KERN_ERR "dcon: Unable to add the DCON device\n");
|
2010-09-25 02:13:42 +00:00
|
|
|
goto edev;
|
|
|
|
}
|
|
|
|
|
2011-02-03 15:22:52 +00:00
|
|
|
for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
|
2011-02-03 13:22:08 +00:00
|
|
|
rc = device_create_file(&dcon_device->dev,
|
|
|
|
&dcon_device_files[i]);
|
|
|
|
if (rc) {
|
|
|
|
dev_err(&dcon_device->dev, "Cannot create sysfs file\n");
|
|
|
|
goto ecreate;
|
|
|
|
}
|
|
|
|
}
|
2010-09-25 02:13:42 +00:00
|
|
|
|
|
|
|
/* Add the backlight device for the DCON */
|
|
|
|
|
|
|
|
dcon_client = client;
|
|
|
|
|
|
|
|
dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
|
|
|
|
NULL, &dcon_bl_ops, NULL);
|
|
|
|
|
|
|
|
if (IS_ERR(dcon_bl_dev)) {
|
2011-02-03 15:22:52 +00:00
|
|
|
printk(KERN_ERR "Cannot register the backlight device (%ld)\n",
|
|
|
|
PTR_ERR(dcon_bl_dev));
|
2010-09-25 02:13:42 +00:00
|
|
|
dcon_bl_dev = NULL;
|
2011-02-03 15:22:52 +00:00
|
|
|
} else {
|
2010-09-25 02:13:42 +00:00
|
|
|
dcon_bl_dev->props.max_brightness = 15;
|
|
|
|
dcon_bl_dev->props.power = FB_BLANK_UNBLANK;
|
|
|
|
dcon_bl_dev->props.brightness = dcon_get_backlight();
|
|
|
|
|
|
|
|
backlight_update_status(dcon_bl_dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
register_reboot_notifier(&dcon_nb);
|
|
|
|
atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
|
|
|
|
fb_register_client(&fb_nb);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2011-02-03 13:22:08 +00:00
|
|
|
ecreate:
|
|
|
|
for (j = 0; j < i; j++)
|
|
|
|
device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
|
2010-09-25 02:13:42 +00:00
|
|
|
edev:
|
|
|
|
platform_device_unregister(dcon_device);
|
|
|
|
dcon_device = NULL;
|
|
|
|
eirq:
|
|
|
|
free_irq(DCON_IRQ, &dcon_driver);
|
|
|
|
einit:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dcon_remove(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
dcon_client = NULL;
|
|
|
|
|
|
|
|
fb_unregister_client(&fb_nb);
|
|
|
|
unregister_reboot_notifier(&dcon_nb);
|
|
|
|
atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
|
|
|
|
|
|
|
|
free_irq(DCON_IRQ, &dcon_driver);
|
|
|
|
|
|
|
|
if (dcon_bl_dev != NULL)
|
|
|
|
backlight_device_unregister(dcon_bl_dev);
|
|
|
|
|
|
|
|
if (dcon_device != NULL)
|
|
|
|
platform_device_unregister(dcon_device);
|
|
|
|
cancel_work_sync(&dcon_work);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int dcon_suspend(struct i2c_client *client, pm_message_t state)
|
|
|
|
{
|
|
|
|
if (dcon_sleep_val == DCON_ACTIVE) {
|
|
|
|
/* Set up the DCON to have the source */
|
|
|
|
dcon_set_source_sync(DCON_SOURCE_DCON);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int dcon_resume(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
if (dcon_sleep_val == DCON_ACTIVE) {
|
|
|
|
dcon_bus_stabilize(client, 0);
|
|
|
|
dcon_set_source(DCON_SOURCE_CPU);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
static irqreturn_t dcon_interrupt(int irq, void *id)
|
|
|
|
{
|
|
|
|
int status = pdata->read_status();
|
|
|
|
|
|
|
|
if (status == -1)
|
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
switch (status & 3) {
|
|
|
|
case 3:
|
|
|
|
printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n");
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 2: /* switch to DCON mode */
|
|
|
|
case 1: /* switch to CPU mode */
|
|
|
|
dcon_switched = 1;
|
|
|
|
getnstimeofday(&dcon_irq_time);
|
|
|
|
wake_up(&dcon_wait_queue);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
/* workaround resume case: the DCON (on 1.5) doesn't
|
|
|
|
* ever assert status 0x01 when switching to CPU mode
|
|
|
|
* during resume. this is because DCONLOAD is de-asserted
|
|
|
|
* _immediately_ upon exiting S3, so the actual release
|
|
|
|
* of the DCON happened long before this point.
|
|
|
|
* see http://dev.laptop.org/ticket/9869
|
|
|
|
*/
|
|
|
|
if (dcon_source != dcon_pending && !dcon_switched) {
|
|
|
|
dcon_switched = 1;
|
|
|
|
getnstimeofday(&dcon_irq_time);
|
|
|
|
wake_up(&dcon_wait_queue);
|
|
|
|
printk(KERN_DEBUG "olpc-dcon: switching w/ status 0/0\n");
|
|
|
|
} else {
|
|
|
|
printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct i2c_device_id dcon_idtable[] = {
|
|
|
|
{ "olpc_dcon", 0 },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(i2c, dcon_idtable);
|
|
|
|
|
|
|
|
static struct i2c_driver dcon_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "olpc_dcon",
|
|
|
|
},
|
|
|
|
.class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
|
|
|
|
.id_table = dcon_idtable,
|
|
|
|
.probe = dcon_probe,
|
|
|
|
.remove = __devexit_p(dcon_remove),
|
|
|
|
.detect = dcon_detect,
|
|
|
|
.address_list = normal_i2c,
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
.suspend = dcon_suspend,
|
|
|
|
.resume = dcon_resume,
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
#include "olpc_dcon_xo_1.c"
|
|
|
|
|
|
|
|
static int __init olpc_dcon_init(void)
|
|
|
|
{
|
|
|
|
pdata = &dcon_pdata_xo_1;
|
|
|
|
|
|
|
|
i2c_add_driver(&dcon_driver);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit olpc_dcon_exit(void)
|
|
|
|
{
|
|
|
|
i2c_del_driver(&dcon_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(olpc_dcon_init);
|
|
|
|
module_exit(olpc_dcon_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|