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@@ -0,0 +1,813 @@
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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) 2010-2011 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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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/interrupt.h>
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+#include <linux/delay.h>
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+#include <linux/module.h>
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+#include <linux/backlight.h>
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+#include <linux/device.h>
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+#include <linux/uaccess.h>
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+#include <linux/ctype.h>
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+#include <linux/reboot.h>
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+#include <linux/olpc-ec.h>
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+#include <asm/tsc.h>
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+#include <asm/olpc.h>
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+
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+#include "olpc_dcon.h"
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+
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+/* Module definitions */
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+
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+static ushort resumeline = 898;
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+module_param(resumeline, ushort, 0444);
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+
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+static struct dcon_platform_data *pdata;
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+
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+/* I2C structures */
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+
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+/* Platform devices */
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+static struct platform_device *dcon_device;
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+
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+static unsigned short normal_i2c[] = { 0x0d, I2C_CLIENT_END };
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+
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+static s32 dcon_write(struct dcon_priv *dcon, u8 reg, u16 val)
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+{
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+ return i2c_smbus_write_word_data(dcon->client, reg, val);
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+}
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+
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+static s32 dcon_read(struct dcon_priv *dcon, u8 reg)
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+{
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+ return i2c_smbus_read_word_data(dcon->client, reg);
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+}
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+
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+/* ===== API functions - these are called by a variety of users ==== */
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+
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+static int dcon_hw_init(struct dcon_priv *dcon, int is_init)
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+{
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+ u16 ver;
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+ int rc = 0;
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+
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+ ver = dcon_read(dcon, DCON_REG_ID);
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+ if ((ver >> 8) != 0xDC) {
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+ pr_err("DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
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+ rc = -ENXIO;
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+ goto err;
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+ }
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+
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+ if (is_init) {
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+ pr_info("Discovered DCON version %x\n", ver & 0xFF);
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+ rc = pdata->init(dcon);
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+ if (rc != 0) {
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+ pr_err("Unable to init.\n");
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+ goto err;
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+ }
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+ }
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+
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+ if (ver < 0xdc02) {
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+ dev_err(&dcon->client->dev,
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+ "DCON v1 is unsupported, giving up..\n");
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+ rc = -ENODEV;
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+ goto err;
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+ }
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+
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+ /* SDRAM setup/hold time */
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+ dcon_write(dcon, 0x3a, 0xc040);
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+ dcon_write(dcon, DCON_REG_MEM_OPT_A, 0x0000); /* clear option bits */
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+ dcon_write(dcon, DCON_REG_MEM_OPT_A,
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+ MEM_DLL_CLOCK_DELAY | MEM_POWER_DOWN);
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+ dcon_write(dcon, DCON_REG_MEM_OPT_B, MEM_SOFT_RESET);
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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 |
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+ MODE_CSWIZZLE | MODE_COL_AA;
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+ }
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+ dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
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+
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+ /* Set the scanline to interrupt on during resume */
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+ dcon_write(dcon, DCON_REG_SCAN_INT, resumeline);
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+
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+err:
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+ return rc;
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+}
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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 dcon_priv *dcon, int is_powered_down)
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+{
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+ unsigned long timeout;
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+ u8 pm;
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+ int x;
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+
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+power_up:
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+ if (is_powered_down) {
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+ pm = 1;
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+ x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
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+ if (x) {
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+ pr_warn("unable to force dcon to power up: %d!\n", x);
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+ return x;
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+ }
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+ usleep_range(10000, 11000); /* we'll be conservative */
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+ }
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+
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+ pdata->bus_stabilize_wiggle();
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+
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+ for (x = -1, timeout = 50; timeout && x < 0; timeout--) {
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+ usleep_range(1000, 1100);
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+ x = dcon_read(dcon, DCON_REG_ID);
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+ }
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+ if (x < 0) {
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+ pr_err("unable to stabilize dcon's smbus, reasserting power and praying.\n");
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+ BUG_ON(olpc_board_at_least(olpc_board(0xc2)));
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+ pm = 0;
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+ olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 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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+
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+ if (is_powered_down)
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+ return dcon_hw_init(dcon, 0);
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+ return 0;
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+}
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+
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+static void dcon_set_backlight(struct dcon_priv *dcon, u8 level)
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+{
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+ dcon->bl_val = level;
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+ dcon_write(dcon, DCON_REG_BRIGHT, dcon->bl_val);
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+
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+ /* Purposely turn off the backlight when we go to level 0 */
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+ if (dcon->bl_val == 0) {
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+ dcon->disp_mode &= ~MODE_BL_ENABLE;
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+ dcon_write(dcon, 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, DCON_REG_MODE, dcon->disp_mode);
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+ }
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+}
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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_mono_mode(struct dcon_priv *dcon, bool enable_mono)
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+{
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+ if (dcon->mono == enable_mono)
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+ return 0;
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+
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+ dcon->mono = enable_mono;
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+
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+ if (enable_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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+ } else {
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+ dcon->disp_mode &= ~(MODE_MONO_LUMA);
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+ dcon->disp_mode |= MODE_CSWIZZLE | MODE_COL_AA;
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+ }
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+
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+ dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode);
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+ return 0;
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+}
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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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+
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+static void dcon_sleep(struct dcon_priv *dcon, bool sleep)
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+{
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+ int x;
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+
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+ /* Turn off the backlight and put the DCON to sleep */
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+
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+ if (dcon->asleep == sleep)
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+ return;
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+
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+ if (!olpc_board_at_least(olpc_board(0xc2)))
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+ return;
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+
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+ if (sleep) {
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+ u8 pm = 0;
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+
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+ x = olpc_ec_cmd(EC_DCON_POWER_MODE, &pm, 1, NULL, 0);
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+ if (x)
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+ pr_warn("unable to force dcon to power down: %d!\n", x);
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+ else
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+ dcon->asleep = sleep;
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+ } else {
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+ /* Only re-enable the backlight if the backlight value is set */
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+ if (dcon->bl_val != 0)
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+ dcon->disp_mode |= MODE_BL_ENABLE;
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+ x = dcon_bus_stabilize(dcon, 1);
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+ if (x)
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+ pr_warn("unable to reinit dcon hardware: %d!\n", x);
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+ else
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+ dcon->asleep = sleep;
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+
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+ /* Restore backlight */
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+ dcon_set_backlight(dcon, dcon->bl_val);
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+ }
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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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+
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+/* the DCON seems to get confused if we change DCONLOAD too
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+ * frequently -- i.e., approximately faster than frame time.
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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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+static void dcon_load_holdoff(struct dcon_priv *dcon)
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+{
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+ ktime_t delta_t, now;
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+
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+ while (1) {
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+ now = ktime_get();
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+ delta_t = ktime_sub(now, dcon->load_time);
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+ if (ktime_to_ns(delta_t) > NSEC_PER_MSEC * 20)
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+ break;
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+ mdelay(4);
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+ }
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+}
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+
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+static bool dcon_blank_fb(struct dcon_priv *dcon, bool blank)
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+{
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+ int err;
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+
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+ console_lock();
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+ if (!lock_fb_info(dcon->fbinfo)) {
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+ console_unlock();
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+ dev_err(&dcon->client->dev, "unable to lock framebuffer\n");
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+ return false;
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+ }
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+
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+ dcon->ignore_fb_events = true;
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+ err = fb_blank(dcon->fbinfo,
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+ blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
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+ dcon->ignore_fb_events = false;
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+ unlock_fb_info(dcon->fbinfo);
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+ console_unlock();
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+
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+ if (err) {
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+ dev_err(&dcon->client->dev, "couldn't %sblank framebuffer\n",
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+ blank ? "" : "un");
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+ return false;
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+ }
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+ return true;
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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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+ struct dcon_priv *dcon = container_of(work, struct dcon_priv,
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+ switch_source);
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+ int source = dcon->pending_src;
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+
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+ if (dcon->curr_src == source)
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+ return;
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+
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+ dcon_load_holdoff(dcon);
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+
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+ dcon->switched = false;
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+
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+ switch (source) {
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+ case DCON_SOURCE_CPU:
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+ pr_info("dcon_source_switch to CPU\n");
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+ /* Enable the scanline interrupt bit */
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+ if (dcon_write(dcon, DCON_REG_MODE,
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+ dcon->disp_mode | MODE_SCAN_INT))
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+ pr_err("couldn't enable scanline interrupt!\n");
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+ else
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+ /* Wait up to one second for the scanline interrupt */
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+ wait_event_timeout(dcon->waitq, dcon->switched, HZ);
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+
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+ if (!dcon->switched)
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+ pr_err("Timeout entering CPU mode; expect a screen glitch.\n");
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+
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+ /* Turn off the scanline interrupt */
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+ if (dcon_write(dcon, DCON_REG_MODE, dcon->disp_mode))
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+ pr_err("couldn't disable scanline interrupt!\n");
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+
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+ /*
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+ * Ideally we'd like to disable interrupts here so that the
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+ * fb unblanking and DCON turn on happen at a known time value;
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+ * however, we can't do that right now with fb_blank
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+ * messing with semaphores.
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+ *
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+ * For now, we just hope..
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+ */
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+ if (!dcon_blank_fb(dcon, false)) {
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+ pr_err("Failed to enter CPU mode\n");
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+ dcon->pending_src = DCON_SOURCE_DCON;
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+ return;
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+ }
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+
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+ /* And turn off the DCON */
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+ pdata->set_dconload(1);
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+ dcon->load_time = ktime_get();
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+
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+ pr_info("The CPU has control\n");
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+ break;
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+ case DCON_SOURCE_DCON:
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+ {
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+ ktime_t delta_t;
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+
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+ pr_info("dcon_source_switch to DCON\n");
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+
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+ /* Clear DCONLOAD - this implies that the DCON is in control */
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+ pdata->set_dconload(0);
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+ dcon->load_time = ktime_get();
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+
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+ wait_event_timeout(dcon->waitq, dcon->switched, HZ/2);
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+
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+ if (!dcon->switched) {
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+ pr_err("Timeout entering DCON mode; expect a screen glitch.\n");
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+ } else {
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+ /* sometimes the DCON doesn't follow its own rules,
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+ * and doesn't wait for two vsync pulses before
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+ * ack'ing the frame load with an IRQ. the result
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+ * is that the display shows the *previously*
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+ * loaded frame. we can detect this by looking at
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+ * the time between asserting DCONLOAD and the IRQ --
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+ * if it's less than 20msec, then the DCON couldn't
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+ * have seen two VSYNC pulses. in that case we
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+ * deassert and reassert, and hope for the best.
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+ * see http://dev.laptop.org/ticket/9664
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+ */
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+ delta_t = ktime_sub(dcon->irq_time, dcon->load_time);
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+ if (dcon->switched && ktime_to_ns(delta_t)
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+ < NSEC_PER_MSEC * 20) {
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+ pr_err("missed loading, retrying\n");
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+ pdata->set_dconload(1);
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+ mdelay(41);
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+ pdata->set_dconload(0);
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+ dcon->load_time = ktime_get();
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+ mdelay(41);
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+ }
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+ }
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+
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+ dcon_blank_fb(dcon, true);
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+ pr_info("The DCON has control\n");
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+ break;
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+ }
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+ default:
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+ BUG();
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+ }
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+
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+ dcon->curr_src = source;
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+}
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+
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+static void dcon_set_source(struct dcon_priv *dcon, int arg)
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+{
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+ if (dcon->pending_src == arg)
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+ return;
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+
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+ dcon->pending_src = arg;
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+
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+ if (dcon->curr_src != arg)
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+ schedule_work(&dcon->switch_source);
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+}
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+
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+static void dcon_set_source_sync(struct dcon_priv *dcon, int arg)
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+{
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+ dcon_set_source(dcon, arg);
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+ flush_scheduled_work();
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+}
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+
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+static ssize_t dcon_mode_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct dcon_priv *dcon = dev_get_drvdata(dev);
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+
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|
|
+ return sprintf(buf, "%4.4X\n", dcon->disp_mode);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_sleep_show(struct device *dev,
|
|
|
+ struct device_attribute *attr, char *buf)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
|
+
|
|
|
+ return sprintf(buf, "%d\n", dcon->asleep);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_freeze_show(struct device *dev,
|
|
|
+ struct device_attribute *attr, char *buf)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
|
+
|
|
|
+ return sprintf(buf, "%d\n", dcon->curr_src == DCON_SOURCE_DCON ? 1 : 0);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_mono_show(struct device *dev,
|
|
|
+ struct device_attribute *attr, char *buf)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
|
+
|
|
|
+ return sprintf(buf, "%d\n", dcon->mono);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_resumeline_show(struct device *dev,
|
|
|
+ struct device_attribute *attr, char *buf)
|
|
|
+{
|
|
|
+ return sprintf(buf, "%d\n", resumeline);
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_mono_store(struct device *dev,
|
|
|
+ struct device_attribute *attr, const char *buf, size_t count)
|
|
|
+{
|
|
|
+ unsigned long enable_mono;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ rc = kstrtoul(buf, 10, &enable_mono);
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ dcon_set_mono_mode(dev_get_drvdata(dev), enable_mono ? true : false);
|
|
|
+
|
|
|
+ return count;
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_freeze_store(struct device *dev,
|
|
|
+ struct device_attribute *attr, const char *buf, size_t count)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = dev_get_drvdata(dev);
|
|
|
+ unsigned long output;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ ret = kstrtoul(buf, 10, &output);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ pr_info("dcon_freeze_store: %lu\n", output);
|
|
|
+
|
|
|
+ switch (output) {
|
|
|
+ case 0:
|
|
|
+ dcon_set_source(dcon, DCON_SOURCE_CPU);
|
|
|
+ break;
|
|
|
+ case 1:
|
|
|
+ dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
|
|
|
+ break;
|
|
|
+ case 2: /* normally unused */
|
|
|
+ dcon_set_source(dcon, 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)
|
|
|
+{
|
|
|
+ unsigned short rl;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ rc = kstrtou16(buf, 10, &rl);
|
|
|
+ if (rc)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ resumeline = rl;
|
|
|
+ dcon_write(dev_get_drvdata(dev), DCON_REG_SCAN_INT, resumeline);
|
|
|
+
|
|
|
+ return count;
|
|
|
+}
|
|
|
+
|
|
|
+static ssize_t dcon_sleep_store(struct device *dev,
|
|
|
+ struct device_attribute *attr, const char *buf, size_t count)
|
|
|
+{
|
|
|
+ unsigned long output;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ ret = kstrtoul(buf, 10, &output);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ dcon_sleep(dev_get_drvdata(dev), output ? true : false);
|
|
|
+ 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(monochrome, 0644, dcon_mono_show, dcon_mono_store),
|
|
|
+ __ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
|
|
|
+};
|
|
|
+
|
|
|
+static int dcon_bl_update(struct backlight_device *dev)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = bl_get_data(dev);
|
|
|
+ u8 level = dev->props.brightness & 0x0F;
|
|
|
+
|
|
|
+ if (dev->props.power != FB_BLANK_UNBLANK)
|
|
|
+ level = 0;
|
|
|
+
|
|
|
+ if (level != dcon->bl_val)
|
|
|
+ dcon_set_backlight(dcon, level);
|
|
|
+
|
|
|
+ /* power down the DCON when the screen is blanked */
|
|
|
+ if (!dcon->ignore_fb_events)
|
|
|
+ dcon_sleep(dcon, !!(dev->props.state & BL_CORE_FBBLANK));
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int dcon_bl_get(struct backlight_device *dev)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = bl_get_data(dev);
|
|
|
+
|
|
|
+ return dcon->bl_val;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct backlight_ops dcon_bl_ops = {
|
|
|
+ .update_status = dcon_bl_update,
|
|
|
+ .get_brightness = dcon_bl_get,
|
|
|
+};
|
|
|
+
|
|
|
+static struct backlight_properties dcon_bl_props = {
|
|
|
+ .max_brightness = 15,
|
|
|
+ .type = BACKLIGHT_RAW,
|
|
|
+ .power = FB_BLANK_UNBLANK,
|
|
|
+};
|
|
|
+
|
|
|
+static int dcon_reboot_notify(struct notifier_block *nb,
|
|
|
+ unsigned long foo, void *bar)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = container_of(nb, struct dcon_priv, reboot_nb);
|
|
|
+
|
|
|
+ if (!dcon || !dcon->client)
|
|
|
+ return NOTIFY_DONE;
|
|
|
+
|
|
|
+ /* Turn off the DCON. Entirely. */
|
|
|
+ dcon_write(dcon, DCON_REG_MODE, 0x39);
|
|
|
+ dcon_write(dcon, DCON_REG_MODE, 0x32);
|
|
|
+ return NOTIFY_DONE;
|
|
|
+}
|
|
|
+
|
|
|
+static int unfreeze_on_panic(struct notifier_block *nb,
|
|
|
+ unsigned long e, void *p)
|
|
|
+{
|
|
|
+ pdata->set_dconload(1);
|
|
|
+ return NOTIFY_DONE;
|
|
|
+}
|
|
|
+
|
|
|
+static struct notifier_block dcon_panic_nb = {
|
|
|
+ .notifier_call = unfreeze_on_panic,
|
|
|
+};
|
|
|
+
|
|
|
+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)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon;
|
|
|
+ int rc, i, j;
|
|
|
+
|
|
|
+ if (!pdata)
|
|
|
+ return -ENXIO;
|
|
|
+
|
|
|
+ dcon = kzalloc(sizeof(*dcon), GFP_KERNEL);
|
|
|
+ if (!dcon)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ dcon->client = client;
|
|
|
+ init_waitqueue_head(&dcon->waitq);
|
|
|
+ INIT_WORK(&dcon->switch_source, dcon_source_switch);
|
|
|
+ dcon->reboot_nb.notifier_call = dcon_reboot_notify;
|
|
|
+ dcon->reboot_nb.priority = -1;
|
|
|
+
|
|
|
+ i2c_set_clientdata(client, dcon);
|
|
|
+
|
|
|
+ if (num_registered_fb < 1) {
|
|
|
+ dev_err(&client->dev, "DCON driver requires a registered fb\n");
|
|
|
+ rc = -EIO;
|
|
|
+ goto einit;
|
|
|
+ }
|
|
|
+ dcon->fbinfo = registered_fb[0];
|
|
|
+
|
|
|
+ rc = dcon_hw_init(dcon, 1);
|
|
|
+ if (rc)
|
|
|
+ goto einit;
|
|
|
+
|
|
|
+ /* Add the DCON device */
|
|
|
+
|
|
|
+ dcon_device = platform_device_alloc("dcon", -1);
|
|
|
+
|
|
|
+ if (!dcon_device) {
|
|
|
+ pr_err("Unable to create the DCON device\n");
|
|
|
+ rc = -ENOMEM;
|
|
|
+ goto eirq;
|
|
|
+ }
|
|
|
+ rc = platform_device_add(dcon_device);
|
|
|
+ platform_set_drvdata(dcon_device, dcon);
|
|
|
+
|
|
|
+ if (rc) {
|
|
|
+ pr_err("Unable to add the DCON device\n");
|
|
|
+ goto edev;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (i = 0; i < ARRAY_SIZE(dcon_device_files); i++) {
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ dcon->bl_val = dcon_read(dcon, DCON_REG_BRIGHT) & 0x0F;
|
|
|
+
|
|
|
+ /* Add the backlight device for the DCON */
|
|
|
+ dcon_bl_props.brightness = dcon->bl_val;
|
|
|
+ dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
|
|
|
+ dcon, &dcon_bl_ops, &dcon_bl_props);
|
|
|
+ if (IS_ERR(dcon->bl_dev)) {
|
|
|
+ dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
|
|
|
+ PTR_ERR(dcon->bl_dev));
|
|
|
+ dcon->bl_dev = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ register_reboot_notifier(&dcon->reboot_nb);
|
|
|
+ atomic_notifier_chain_register(&panic_notifier_list, &dcon_panic_nb);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ecreate:
|
|
|
+ for (j = 0; j < i; j++)
|
|
|
+ device_remove_file(&dcon_device->dev, &dcon_device_files[j]);
|
|
|
+ edev:
|
|
|
+ platform_device_unregister(dcon_device);
|
|
|
+ dcon_device = NULL;
|
|
|
+ eirq:
|
|
|
+ free_irq(DCON_IRQ, dcon);
|
|
|
+ einit:
|
|
|
+ kfree(dcon);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+static int dcon_remove(struct i2c_client *client)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
|
+
|
|
|
+ unregister_reboot_notifier(&dcon->reboot_nb);
|
|
|
+ atomic_notifier_chain_unregister(&panic_notifier_list, &dcon_panic_nb);
|
|
|
+
|
|
|
+ free_irq(DCON_IRQ, dcon);
|
|
|
+
|
|
|
+ backlight_device_unregister(dcon->bl_dev);
|
|
|
+
|
|
|
+ if (dcon_device)
|
|
|
+ platform_device_unregister(dcon_device);
|
|
|
+ cancel_work_sync(&dcon->switch_source);
|
|
|
+
|
|
|
+ kfree(dcon);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#ifdef CONFIG_PM
|
|
|
+static int dcon_suspend(struct device *dev)
|
|
|
+{
|
|
|
+ struct i2c_client *client = to_i2c_client(dev);
|
|
|
+ struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
|
+
|
|
|
+ if (!dcon->asleep) {
|
|
|
+ /* Set up the DCON to have the source */
|
|
|
+ dcon_set_source_sync(dcon, DCON_SOURCE_DCON);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int dcon_resume(struct device *dev)
|
|
|
+{
|
|
|
+ struct i2c_client *client = to_i2c_client(dev);
|
|
|
+ struct dcon_priv *dcon = i2c_get_clientdata(client);
|
|
|
+
|
|
|
+ if (!dcon->asleep) {
|
|
|
+ dcon_bus_stabilize(dcon, 0);
|
|
|
+ dcon_set_source(dcon, DCON_SOURCE_CPU);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#else
|
|
|
+
|
|
|
+#define dcon_suspend NULL
|
|
|
+#define dcon_resume NULL
|
|
|
+
|
|
|
+#endif /* CONFIG_PM */
|
|
|
+
|
|
|
+irqreturn_t dcon_interrupt(int irq, void *id)
|
|
|
+{
|
|
|
+ struct dcon_priv *dcon = id;
|
|
|
+ u8 status;
|
|
|
+
|
|
|
+ if (pdata->read_status(&status))
|
|
|
+ return IRQ_NONE;
|
|
|
+
|
|
|
+ switch (status & 3) {
|
|
|
+ case 3:
|
|
|
+ pr_debug("DCONLOAD_MISSED interrupt\n");
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 2: /* switch to DCON mode */
|
|
|
+ case 1: /* switch to CPU mode */
|
|
|
+ dcon->switched = true;
|
|
|
+ dcon->irq_time = ktime_get();
|
|
|
+ wake_up(&dcon->waitq);
|
|
|
+ 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->curr_src != dcon->pending_src && !dcon->switched) {
|
|
|
+ dcon->switched = true;
|
|
|
+ dcon->irq_time = ktime_get();
|
|
|
+ wake_up(&dcon->waitq);
|
|
|
+ pr_debug("switching w/ status 0/0\n");
|
|
|
+ } else {
|
|
|
+ pr_debug("scanline interrupt w/CPU\n");
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return IRQ_HANDLED;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct dev_pm_ops dcon_pm_ops = {
|
|
|
+ .suspend = dcon_suspend,
|
|
|
+ .resume = dcon_resume,
|
|
|
+};
|
|
|
+
|
|
|
+static const 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",
|
|
|
+ .pm = &dcon_pm_ops,
|
|
|
+ },
|
|
|
+ .class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
|
|
|
+ .id_table = dcon_idtable,
|
|
|
+ .probe = dcon_probe,
|
|
|
+ .remove = dcon_remove,
|
|
|
+ .detect = dcon_detect,
|
|
|
+ .address_list = normal_i2c,
|
|
|
+};
|
|
|
+
|
|
|
+static int __init olpc_dcon_init(void)
|
|
|
+{
|
|
|
+#ifdef CONFIG_FB_OLPC_DCON_1_5
|
|
|
+ /* XO-1.5 */
|
|
|
+ if (olpc_board_at_least(olpc_board(0xd0)))
|
|
|
+ pdata = &dcon_pdata_xo_1_5;
|
|
|
+#endif
|
|
|
+#ifdef CONFIG_FB_OLPC_DCON_1
|
|
|
+ if (!pdata)
|
|
|
+ pdata = &dcon_pdata_xo_1;
|
|
|
+#endif
|
|
|
+
|
|
|
+ return i2c_add_driver(&dcon_driver);
|
|
|
+}
|
|
|
+
|
|
|
+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");
|
Linus Torvalds