468 lines
11 KiB
C
468 lines
11 KiB
C
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// #define DEBUG
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/* ToDo list (incomplete, unorderd)
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- convert mouse, keyboard, and power to platform devices
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*/
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <linux/completion.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/serio.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/clk.h>
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#include <mach/iomap.h>
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#include <mach/clk.h>
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#include <linux/semaphore.h>
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#include <linux/list.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include "nvec.h"
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static unsigned char EC_DISABLE_EVENT_REPORTING[] = {'\x04','\x00','\x00'};
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static unsigned char EC_ENABLE_EVENT_REPORTING[] = {'\x04','\x00','\x01'};
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static unsigned char EC_GET_FIRMWARE_VERSION[] = {'\x07','\x15'};
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static struct nvec_chip *nvec_power_handle;
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int nvec_register_notifier(struct nvec_chip *nvec, struct notifier_block *nb,
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unsigned int events)
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{
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return atomic_notifier_chain_register(&nvec->notifier_list, nb);
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}
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EXPORT_SYMBOL_GPL(nvec_register_notifier);
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static int nvec_status_notifier(struct notifier_block *nb, unsigned long event_type,
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void *data)
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{
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unsigned char *msg = (unsigned char *)data;
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int i;
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if(event_type != NVEC_CNTL)
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return NOTIFY_DONE;
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printk("unhandled msg type %ld, payload: ", event_type);
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for (i = 0; i < msg[1]; i++)
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printk("%0x ", msg[i+2]);
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printk("\n");
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return NOTIFY_OK;
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}
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void nvec_write_async(struct nvec_chip *nvec, unsigned char *data, short size)
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{
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struct nvec_msg *msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT);
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msg->data = kzalloc(size, GFP_NOWAIT);
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msg->data[0] = size;
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memcpy(msg->data + 1, data, size);
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msg->size = size + 1;
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msg->pos = 0;
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INIT_LIST_HEAD(&msg->node);
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list_add_tail(&msg->node, &nvec->tx_data);
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gpio_set_value(nvec->gpio, 0);
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}
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EXPORT_SYMBOL(nvec_write_async);
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static void nvec_request_master(struct work_struct *work)
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{
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struct nvec_chip *nvec = container_of(work, struct nvec_chip, tx_work);
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if(!list_empty(&nvec->tx_data)) {
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gpio_set_value(nvec->gpio, 0);
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}
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}
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static int parse_msg(struct nvec_chip *nvec, struct nvec_msg *msg)
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{
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int i;
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if((msg->data[0] & 1<<7) == 0 && msg->data[3]) {
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dev_err(nvec->dev, "ec responded %02x %02x %02x %02x\n", msg->data[0],
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msg->data[1], msg->data[2], msg->data[3]);
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return -EINVAL;
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}
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if ((msg->data[0] >> 7 ) == 1 && (msg->data[0] & 0x0f) == 5)
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{
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dev_warn(nvec->dev, "ec system event ");
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for (i=0; i < msg->data[1]; i++)
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dev_warn(nvec->dev, "%02x ", msg->data[2+i]);
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dev_warn(nvec->dev, "\n");
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}
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atomic_notifier_call_chain(&nvec->notifier_list, msg->data[0] & 0x8f, msg->data);
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return 0;
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}
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static struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec, unsigned char *data, short size)
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{
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down(&nvec->sync_write_mutex);
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nvec->sync_write_pending = (data[1] << 8) + data[0];
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nvec_write_async(nvec, data, size);
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dev_dbg(nvec->dev, "nvec_sync_write: 0x%04x\n", nvec->sync_write_pending);
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wait_for_completion(&nvec->sync_write);
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dev_dbg(nvec->dev, "nvec_sync_write: pong!\n");
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up(&nvec->sync_write_mutex);
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return nvec->last_sync_msg;
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}
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/* RX worker */
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static void nvec_dispatch(struct work_struct *work)
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{
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struct nvec_chip *nvec = container_of(work, struct nvec_chip, rx_work);
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struct nvec_msg *msg;
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while(!list_empty(&nvec->rx_data))
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{
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msg = list_first_entry(&nvec->rx_data, struct nvec_msg, node);
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list_del_init(&msg->node);
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if(nvec->sync_write_pending == (msg->data[2] << 8) + msg->data[0])
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{
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dev_dbg(nvec->dev, "sync write completed!\n");
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nvec->sync_write_pending = 0;
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nvec->last_sync_msg = msg;
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complete(&nvec->sync_write);
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} else {
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parse_msg(nvec, msg);
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if((!msg) || (!msg->data))
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dev_warn(nvec->dev, "attempt access zero pointer");
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else {
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kfree(msg->data);
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kfree(msg);
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}
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}
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}
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}
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static irqreturn_t i2c_interrupt(int irq, void *dev)
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{
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unsigned long status;
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unsigned long received;
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unsigned char to_send;
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struct nvec_msg *msg;
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struct nvec_chip *nvec = (struct nvec_chip *)dev;
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unsigned char *i2c_regs = nvec->i2c_regs;
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status = readl(i2c_regs + I2C_SL_STATUS);
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if(!(status & I2C_SL_IRQ))
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{
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dev_warn(nvec->dev, "nvec Spurious IRQ\n");
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//Yup, handled. ahum.
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goto handled;
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}
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if(status & END_TRANS && !(status & RCVD))
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{
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//Reenable IRQ only when even has been sent
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//printk("Write sequence ended !\n");
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//parse_msg(nvec);
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nvec->state = NVEC_WAIT;
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if(nvec->rx->size > 1)
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{
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list_add_tail(&nvec->rx->node, &nvec->rx_data);
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schedule_work(&nvec->rx_work);
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} else {
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kfree(nvec->rx->data);
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kfree(nvec->rx);
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}
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return IRQ_HANDLED;
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} else if(status & RNW)
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{
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// Work around for AP20 New Slave Hw Bug. Give 1us extra.
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// nvec/smbus/nvec_i2c_transport.c in NV`s crap for reference
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if(status & RCVD)
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udelay(3);
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if(status & RCVD)
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{
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nvec->state = NVEC_WRITE;
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//Master wants something from us. New communication
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// dev_dbg(nvec->dev, "New read comm!\n");
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} else {
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//Master wants something from us from a communication we've already started
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// dev_dbg(nvec->dev, "Read comm cont !\n");
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}
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//if(msg_pos<msg_size) {
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if(list_empty(&nvec->tx_data))
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{
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dev_err(nvec->dev, "nvec empty tx - sending no-op\n");
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to_send = 0x8a;
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nvec_write_async(nvec, "\x07\x02", 2);
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// to_send = 0x01;
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} else {
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msg = list_first_entry(&nvec->tx_data, struct nvec_msg, node);
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if(msg->pos < msg->size) {
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to_send = msg->data[msg->pos];
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msg->pos++;
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} else {
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dev_err(nvec->dev, "nvec crap! %d\n", msg->size);
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to_send = 0x01;
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}
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if(msg->pos >= msg->size)
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{
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list_del_init(&msg->node);
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kfree(msg->data);
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kfree(msg);
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schedule_work(&nvec->tx_work);
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nvec->state = NVEC_WAIT;
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}
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}
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writel(to_send, i2c_regs + I2C_SL_RCVD);
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gpio_set_value(nvec->gpio, 1);
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dev_dbg(nvec->dev, "nvec sent %x\n", to_send);
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goto handled;
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} else {
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received = readl(i2c_regs + I2C_SL_RCVD);
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//Workaround?
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if(status & RCVD) {
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writel(0, i2c_regs + I2C_SL_RCVD);
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goto handled;
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}
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if (nvec->state == NVEC_WAIT)
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{
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nvec->state = NVEC_READ;
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msg = kzalloc(sizeof(struct nvec_msg), GFP_NOWAIT);
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msg->data = kzalloc(32, GFP_NOWAIT);
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INIT_LIST_HEAD(&msg->node);
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nvec->rx = msg;
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} else
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msg = nvec->rx;
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BUG_ON(msg->pos > 32);
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msg->data[msg->pos] = received;
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msg->pos++;
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msg->size = msg->pos;
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dev_dbg(nvec->dev, "Got %02lx from Master (pos: %d)!\n", received, msg->pos);
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}
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handled:
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return IRQ_HANDLED;
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}
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static int __devinit nvec_add_subdev(struct nvec_chip *nvec, struct nvec_subdev *subdev)
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{
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struct platform_device *pdev;
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pdev = platform_device_alloc(subdev->name, subdev->id);
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pdev->dev.parent = nvec->dev;
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pdev->dev.platform_data = subdev->platform_data;
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return platform_device_add(pdev);
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}
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static void tegra_init_i2c_slave(struct nvec_platform_data *pdata, unsigned char *i2c_regs,
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struct clk *i2c_clk)
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{
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u32 val;
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clk_enable(i2c_clk);
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tegra_periph_reset_assert(i2c_clk);
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udelay(2);
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tegra_periph_reset_deassert(i2c_clk);
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writel(pdata->i2c_addr>>1, i2c_regs + I2C_SL_ADDR1);
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writel(0, i2c_regs + I2C_SL_ADDR2);
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writel(0x1E, i2c_regs + I2C_SL_DELAY_COUNT);
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val = I2C_CNFG_NEW_MASTER_SFM | I2C_CNFG_PACKET_MODE_EN |
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(0x2 << I2C_CNFG_DEBOUNCE_CNT_SHIFT);
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writel(val, i2c_regs + I2C_CNFG);
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writel(I2C_SL_NEWL, i2c_regs + I2C_SL_CNFG);
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clk_disable(i2c_clk);
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}
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static void nvec_power_off(void)
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{
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nvec_write_async(nvec_power_handle, EC_DISABLE_EVENT_REPORTING, 3);
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nvec_write_async(nvec_power_handle, "\x04\x01", 2);
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}
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static int __devinit tegra_nvec_probe(struct platform_device *pdev)
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{
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int err, i, ret;
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struct clk *i2c_clk;
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struct nvec_platform_data *pdata = pdev->dev.platform_data;
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struct nvec_chip *nvec;
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struct nvec_msg *msg;
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unsigned char *i2c_regs;
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nvec = kzalloc(sizeof(struct nvec_chip), GFP_KERNEL);
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if(nvec == NULL) {
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dev_err(&pdev->dev, "failed to reserve memory\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, nvec);
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nvec->dev = &pdev->dev;
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nvec->gpio = pdata->gpio;
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nvec->irq = pdata->irq;
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/*
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i2c_clk=clk_get_sys(NULL, "i2c");
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if(IS_ERR_OR_NULL(i2c_clk))
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printk(KERN_ERR"No such clock tegra-i2c.2\n");
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else
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clk_enable(i2c_clk);
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*/
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i2c_regs = ioremap(pdata->base, pdata->size);
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if(!i2c_regs) {
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dev_err(nvec->dev, "failed to ioremap registers\n");
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goto failed;
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}
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nvec->i2c_regs = i2c_regs;
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i2c_clk = clk_get_sys(pdata->clock, NULL);
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if(IS_ERR_OR_NULL(i2c_clk)) {
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dev_err(nvec->dev, "failed to get clock tegra-i2c.2\n");
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goto failed;
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}
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tegra_init_i2c_slave(pdata, i2c_regs, i2c_clk);
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err = request_irq(nvec->irq, i2c_interrupt, IRQF_DISABLED, "nvec", nvec);
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if(err) {
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dev_err(nvec->dev, "couldn't request irq");
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goto failed;
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}
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clk_enable(i2c_clk);
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clk_set_rate(i2c_clk, 8*80000);
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/* Set the gpio to low when we've got something to say */
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err = gpio_request(nvec->gpio, "nvec gpio");
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if(err < 0)
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dev_err(nvec->dev, "couldn't request gpio\n");
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tegra_gpio_enable(nvec->gpio);
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gpio_direction_output(nvec->gpio, 1);
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gpio_set_value(nvec->gpio, 1);
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ATOMIC_INIT_NOTIFIER_HEAD(&nvec->notifier_list);
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init_completion(&nvec->sync_write);
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sema_init(&nvec->sync_write_mutex, 1);
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INIT_LIST_HEAD(&nvec->tx_data);
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INIT_LIST_HEAD(&nvec->rx_data);
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INIT_WORK(&nvec->rx_work, nvec_dispatch);
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INIT_WORK(&nvec->tx_work, nvec_request_master);
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/* enable event reporting */
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nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING,
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sizeof(EC_ENABLE_EVENT_REPORTING));
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nvec_kbd_init(nvec);
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#ifdef CONFIG_SERIO_NVEC_PS2
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nvec_ps2(nvec);
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#endif
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/* setup subdevs */
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for (i = 0; i < pdata->num_subdevs; i++) {
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ret = nvec_add_subdev(nvec, &pdata->subdevs[i]);
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}
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nvec->nvec_status_notifier.notifier_call = nvec_status_notifier;
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nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0);
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nvec_power_handle = nvec;
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pm_power_off = nvec_power_off;
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/* Get Firmware Version */
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msg = nvec_write_sync(nvec, EC_GET_FIRMWARE_VERSION,
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sizeof(EC_GET_FIRMWARE_VERSION));
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dev_warn(nvec->dev, "ec firmware version %02x.%02x.%02x / %02x\n",
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msg->data[4], msg->data[5], msg->data[6], msg->data[7]);
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kfree(msg->data);
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kfree(msg);
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/* unmute speakers? */
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nvec_write_async(nvec, "\x0d\x10\x59\x94", 4);
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/* enable lid switch event */
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nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x02\x00", 7);
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/* enable power button event */
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nvec_write_async(nvec, "\x01\x01\x01\x00\x00\x80\x00", 7);
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return 0;
|
||
|
|
||
|
failed:
|
||
|
kfree(nvec);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
static int __devexit tegra_nvec_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
// TODO: unregister
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#ifdef CONFIG_PM
|
||
|
|
||
|
static int tegra_nvec_suspend(struct platform_device *pdev, pm_message_t state)
|
||
|
{
|
||
|
struct nvec_chip *nvec = platform_get_drvdata(pdev);
|
||
|
|
||
|
dev_dbg(nvec->dev, "suspending\n");
|
||
|
nvec_write_async(nvec, EC_DISABLE_EVENT_REPORTING, 3);
|
||
|
nvec_write_async(nvec, "\x04\x02", 2);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int tegra_nvec_resume(struct platform_device *pdev) {
|
||
|
|
||
|
struct nvec_chip *nvec = platform_get_drvdata(pdev);
|
||
|
|
||
|
dev_dbg(nvec->dev, "resuming\n");
|
||
|
nvec_write_async(nvec, EC_ENABLE_EVENT_REPORTING, 3);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
#define tegra_nvec_suspend NULL
|
||
|
#define tegra_nvec_resume NULL
|
||
|
#endif
|
||
|
|
||
|
static struct platform_driver nvec_device_driver =
|
||
|
{
|
||
|
.probe = tegra_nvec_probe,
|
||
|
.remove = __devexit_p(tegra_nvec_remove),
|
||
|
.suspend = tegra_nvec_suspend,
|
||
|
.resume = tegra_nvec_resume,
|
||
|
.driver = {
|
||
|
.name = "nvec",
|
||
|
.owner = THIS_MODULE,
|
||
|
}
|
||
|
};
|
||
|
|
||
|
static int __init tegra_nvec_init(void)
|
||
|
{
|
||
|
return platform_driver_register(&nvec_device_driver);
|
||
|
}
|
||
|
|
||
|
module_init(tegra_nvec_init);
|
||
|
MODULE_ALIAS("platform:nvec");
|