279 lines
6.6 KiB
Diff
279 lines
6.6 KiB
Diff
From 626675b8f03f416a6b1c50f69dabb8a3f27b200a Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Wed, 12 May 2010 14:23:43 +0200
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Subject: [PATCH] Add n526 lpc driver
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---
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drivers/misc/Kconfig | 9 ++
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drivers/misc/Makefile | 1 +
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drivers/misc/n526-lpc.c | 238 +++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 248 insertions(+), 0 deletions(-)
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create mode 100644 drivers/misc/n526-lpc.c
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--- a/drivers/misc/Kconfig
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+++ b/drivers/misc/Kconfig
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@@ -398,6 +398,15 @@ config N516_LPC
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help
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N516 keyboard & power controller driver
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+config N526_LPC
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+ tristate "N526 LPC934 coprocessor"
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+ depends on JZ4740_N526
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+ help
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+ If you say yes here you get support for the N526s NXP LPC934 coprocessor.
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+ It is used as a keyboard controllor and for power management.
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+
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+ If you have a N526 you probably want to say Y here.
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+
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source "drivers/misc/c2port/Kconfig"
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source "drivers/misc/eeprom/Kconfig"
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source "drivers/misc/cb710/Kconfig"
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--- a/drivers/misc/Makefile
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+++ b/drivers/misc/Makefile
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@@ -36,3 +36,4 @@ obj-y += cb710/
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obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
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obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
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obj-$(CONFIG_N516_LPC) += n516-lpc.o
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+obj-$(CONFIG_N526_LPC) += n526-lpc.o
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--- /dev/null
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+++ b/drivers/misc/n526-lpc.c
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@@ -0,0 +1,238 @@
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+/*
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+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/i2c.h>
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+#include <linux/input.h>
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+#include <linux/irq.h>
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+#include <linux/interrupt.h>
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+#include <linux/slab.h>
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+
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+#include <linux/workqueue.h>
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+
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+#include <asm/mach-jz4740/irq.h>
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+#include <asm/mach-jz4740/gpio.h>
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+
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+struct n526_lpc {
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+ struct i2c_client *client;
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+ struct input_dev *input;
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+
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+ struct work_struct work;
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+};
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+
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+static const unsigned int n526_lpc_keymap[] = {
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+ [0x01] = KEY_PAGEUP,
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+ [0x02] = KEY_PAGEDOWN,
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+ [0x03] = KEY_VOLUMEUP,
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+ [0x04] = KEY_VOLUMEDOWN,
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+ [0x06] = KEY_1,
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+ [0x07] = KEY_Q,
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+ [0x08] = KEY_A,
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+ [0x09] = KEY_Z,
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+ [0x0a] = KEY_LEFTSHIFT,
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+ [0x0b] = KEY_2,
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+ [0x0c] = KEY_W,
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+ [0x0d] = KEY_S,
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+ [0x0e] = KEY_X,
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+ [0x0f] = KEY_REFRESH,
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+ [0x10] = KEY_3,
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+ [0x11] = KEY_E,
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+ [0x12] = KEY_D,
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+ [0x13] = KEY_C,
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+ [0x14] = KEY_DOCUMENTS,
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+ [0x15] = KEY_4,
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+ [0x16] = KEY_R,
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+ [0x17] = KEY_F,
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+ [0x18] = KEY_V,
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+ [0x19] = KEY_MUTE,
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+ [0x1a] = KEY_5,
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+ [0x1b] = KEY_T,
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+ [0x1c] = KEY_G,
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+ [0x1d] = KEY_B,
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+ [0x1e] = KEY_DELETE,
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+ [0x1f] = KEY_6,
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+ [0x20] = KEY_Y,
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+ [0x21] = KEY_H,
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+ [0x22] = KEY_N,
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+ [0x23] = KEY_SPACE,
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+ [0x24] = KEY_7,
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+ [0x25] = KEY_U,
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+ [0x26] = KEY_J,
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+ [0x27] = KEY_M,
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+/* [0x28] = KEY_SYM, */
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+ [0x29] = KEY_8,
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+ [0x2a] = KEY_I,
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+ [0x2b] = KEY_K,
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+ [0x2c] = KEY_MENU,
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+ [0x2d] = KEY_LEFT,
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+ [0x2e] = KEY_9,
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+ [0x2f] = KEY_O,
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+ [0x30] = KEY_L,
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+ [0x31] = KEY_UP,
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+ [0x32] = KEY_DOWN,
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+ [0x33] = KEY_0,
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+ [0x34] = KEY_P,
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+ [0x35] = KEY_BACKSPACE,
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+ [0x36] = KEY_ENTER,
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+ [0x37] = KEY_RIGHT,
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+};
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+
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+static void n526_lpc_irq_work(struct work_struct *work)
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+{
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+ int ret;
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+ struct n526_lpc *n526_lpc = container_of(work, struct n526_lpc, work);
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+ struct i2c_client *client = n526_lpc->client;
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+ unsigned char raw_msg;
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+ struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
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+ unsigned char keycode;
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+
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+
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+ ret = i2c_transfer(client->adapter, &msg, 1);
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+
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+ if (ret != 1) {
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+ dev_err(&client->dev, "Failed to read lpc status\n");
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+ }
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+
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+ keycode = raw_msg & 0x7f;
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+
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+ if (keycode < ARRAY_SIZE(n526_lpc_keymap)) {
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+ input_report_key(n526_lpc->input, n526_lpc_keymap[keycode],
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+ !(raw_msg & 0x80));
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+ input_sync(n526_lpc->input);
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+ }
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+}
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+
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+static irqreturn_t n526_lpc_irq(int irq, void *dev_id)
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+{
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+ struct n526_lpc *n526_lpc = dev_id;
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+
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+ schedule_work(&n526_lpc->work);
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+ return IRQ_HANDLED;
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+}
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+
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+static int __devinit n526_lpc_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ int ret;
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+ size_t i;
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+ struct n526_lpc *n526_lpc;
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+ struct input_dev *input;
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+
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+ n526_lpc = kmalloc(sizeof(*n526_lpc), GFP_KERNEL);
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+
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+ if (!n526_lpc) {
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+ dev_err(&client->dev, "Failed to allocate device structure\n");
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+ return -ENOMEM;
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+ }
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+
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+ input = input_allocate_device();
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+ if (!input) {
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+ dev_err(&client->dev, "Failed to allocate input device\n");
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+ ret = -ENOMEM;
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+ goto err_free;
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+ }
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+
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+ input->name = "n526-keys";
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+ input->phys = "n526-keys/input0";
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+ input->dev.parent = &client->dev;
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+ input->id.bustype = BUS_I2C;
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+ input->id.vendor = 0x0001;
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+ input->id.product = 0x0001;
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+ input->id.version = 0x0001;
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+
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+ __set_bit(EV_KEY, input->evbit);
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+
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+ for (i = 0; i < ARRAY_SIZE(n526_lpc_keymap); ++i) {
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+ if (n526_lpc_keymap[i] != 0)
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+ __set_bit(n526_lpc_keymap[i], input->keybit);
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+ }
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+
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+ ret = input_register_device(input);
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+
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+ if (ret) {
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+ dev_err(&client->dev, "Failed to register input device: %d\n", ret);
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+ goto err_free_input;
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+ }
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+
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+ n526_lpc->client = client;
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+ n526_lpc->input = input;
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+ INIT_WORK(&n526_lpc->work, n526_lpc_irq_work);
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+
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+ ret = request_irq(client->irq, n526_lpc_irq, IRQF_TRIGGER_FALLING,
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+ "n526-lpc", n526_lpc);
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+ if (ret) {
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+ dev_err(&client->dev, "Failed to request irq: %d\n", ret);
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+ goto err_unregister_input;
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+ }
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+
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+ i2c_set_clientdata(client, n526_lpc);
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+
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+ return 0;
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+
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+err_unregister_input:
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+ input_unregister_device(input);
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+err_free_input:
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+ input_free_device(input);
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+err_free:
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+ kfree(n526_lpc);
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+
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+ return ret;
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+}
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+
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+static int n526_lpc_remove(struct i2c_client *client)
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+{
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+ struct n526_lpc *n526_lpc = i2c_get_clientdata(client);
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+
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+ free_irq(client->irq, n526_lpc);
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+
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+ i2c_set_clientdata(client, NULL);
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+ input_unregister_device(n526_lpc->input);
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+ input_free_device(n526_lpc->input);
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+ kfree(n526_lpc);
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+
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+ return 0;
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+}
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+
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+static const struct i2c_device_id n526_lpc_id[] = {
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+ { "n526-lpc", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, n526_lpc_id);
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+
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+static struct i2c_driver n526_lpc_driver = {
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+ .driver = {
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+ .name = "n526-lpc",
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = n526_lpc_probe,
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+ .remove = n526_lpc_remove,
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+ .id_table = n526_lpc_id,
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+};
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+
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+static int __init n526_lpc_init(void)
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+{
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+ return i2c_add_driver(&n526_lpc_driver);
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+}
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+module_init(n526_lpc_init);
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+
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+static void __exit n526_lpc_exit(void)
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+{
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+ i2c_del_driver(&n526_lpc_driver);
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+}
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+module_exit(n526_lpc_exit);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Lars-Peter Clausen");
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+MODULE_DESCRIPTION("n526 keypad driver");
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+MODULE_ALIAS("i2c:n526-keys");
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