2012-11-03 11:26:19 +00:00
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/*
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* Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* Under GPLv2
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*/
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#include <common.h>
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#include <errno.h>
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#include <init.h>
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#include <clock.h>
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#include <poller.h>
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#include <kfifo.h>
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#include <i2c/i2c.h>
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#include <malloc.h>
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#include <readkey.h>
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#include <input/qt1070.h>
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#include <gpio.h>
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#define QT1070_CHIP_ID 0x2e
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#define QT1070_READ_CHIP_ID 0x00
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#define QT1070_FW_VERSION 0x01
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#define QT1070_DET_STATUS 0x02
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#define QT1070_KEY_STATUS 0x03
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/* Calibrate */
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#define QT1070_CALIBRATE_CMD 0x38
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#define QT1070_CAL_TIME 200
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/* Reset */
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#define QT1070_RESET 0x39
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#define QT1070_RESET_TIME 255
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static int default_code[QT1070_NB_BUTTONS] = {
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2014-02-14 10:23:57 +00:00
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BB_KEY_ENTER, BB_KEY_HOME, BB_KEY_UP, BB_KEY_DOWN,
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BB_KEY_RIGHT, BB_KEY_LEFT, BB_KEY_CLEAR_SCREEN };
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2012-11-03 11:26:19 +00:00
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struct qt1070_data {
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int code[QT1070_NB_BUTTONS];
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int irq_pin;
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u64 start;
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/* optional */
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int fifo_size;
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struct i2c_client *client;
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u8 button_state[QT1070_NB_BUTTONS];
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u8 previous_state;
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struct kfifo *recv_fifo;
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struct poller_struct poller;
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struct console_device cdev;
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};
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static inline struct qt1070_data *
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poller_to_qt_data(struct poller_struct *poller)
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{
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return container_of(poller, struct qt1070_data, poller);
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}
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static inline struct qt1070_data *
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cdev_to_qt_data(struct console_device *cdev)
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{
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return container_of(cdev, struct qt1070_data, cdev);
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}
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static bool qt1070_read(struct qt1070_data *data, u8 reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(data->client, reg, val, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EIO;
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return 0;
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}
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static bool qt1070_write(struct qt1070_data *data, u8 reg, const u8 val)
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{
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int ret;
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ret = i2c_write_reg(data->client, reg, &val, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EIO;
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return 0;
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}
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static void qt1070_poller(struct poller_struct *poller)
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{
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struct qt1070_data *data = poller_to_qt_data(poller);
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int i;
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u8 buf, bt;
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u8 mask = 0x1;
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if (gpio_is_valid(data->irq_pin)) {
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/* active low */
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if (gpio_get_value(data->irq_pin))
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return;
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}
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qt1070_read(data, QT1070_DET_STATUS, &buf);
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if (qt1070_read(data, QT1070_KEY_STATUS, &buf))
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return;
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if (!buf & !data->previous_state)
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return;
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for (i = 0; i < QT1070_NB_BUTTONS; i++) {
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bt = buf & mask;
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if (!bt && data->button_state[i]) {
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dev_dbg(data->cdev.dev, "release key(%d) as %d\n", i, data->code[i]);
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kfifo_put(data->recv_fifo, (u_char*)&data->code[i], sizeof(int));
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} else if (bt) {
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dev_dbg(data->cdev.dev, "pressed key(%d) as %d\n", i, data->code[i]);
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}
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data->button_state[i] = bt;
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mask <<= 1;
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}
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data->previous_state = buf;
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}
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static void qt1070_reset_poller(struct poller_struct *poller)
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{
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struct qt1070_data *data = poller_to_qt_data(poller);
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u8 buf;
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if (!is_timeout_non_interruptible(data->start, QT1070_RESET_TIME * MSECOND))
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return;
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/* clear the status */
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qt1070_read(data, QT1070_DET_STATUS, &buf);
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poller->func = qt1070_poller;
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}
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static void qt1070_calibrate_poller(struct poller_struct *poller)
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{
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struct qt1070_data *data = poller_to_qt_data(poller);
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int ret;
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if (!is_timeout_non_interruptible(data->start, QT1070_CAL_TIME * MSECOND))
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return;
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/* Soft reset */
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ret = qt1070_write(data, QT1070_RESET, 1);
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if (ret) {
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dev_err(data->cdev.dev, "can not reset the chip (%d)\n", ret);
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poller_unregister(poller);
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return;
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}
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data->start = get_time_ns();
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poller->func = qt1070_reset_poller;
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}
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static int qt1070_tstc(struct console_device *cdev)
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{
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struct qt1070_data *data = cdev_to_qt_data(cdev);
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return (kfifo_len(data->recv_fifo) == 0) ? 0 : 1;
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}
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static int qt1070_getc(struct console_device *cdev)
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{
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int code = 0;
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struct qt1070_data *data = cdev_to_qt_data(cdev);
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kfifo_get(data->recv_fifo, (u_char*)&code, sizeof(int));
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return code;
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}
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static int qt1070_pdata_init(struct device_d *dev, struct qt1070_data *data)
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{
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struct qt1070_platform_data *pdata = dev->platform_data;
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int ret;
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if (!pdata)
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return 0;
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if (pdata->nb_code)
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memcpy(data->code, pdata->code, sizeof(int) * pdata->nb_code);
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if (!gpio_is_valid(pdata->irq_pin))
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return 0;
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ret = gpio_request(pdata->irq_pin, "qt1070");
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if (ret)
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return ret;
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ret = gpio_direction_input(pdata->irq_pin);
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if (ret)
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goto err;
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data->irq_pin = pdata->irq_pin;
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return 0;
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err:
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gpio_free(pdata->irq_pin);
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return ret;
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}
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static int qt1070_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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struct qt1070_data *data;
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u8 fw_version, chip_id;
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int ret;
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data = xzalloc(sizeof(*data));
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data->client = to_i2c_client(dev);
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data->irq_pin = -EINVAL;
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ret = qt1070_read(data, QT1070_READ_CHIP_ID, &chip_id);
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if (ret) {
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dev_err(dev, "can not read chip id (%d)\n", ret);
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goto err;
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}
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if (chip_id != QT1070_CHIP_ID) {
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dev_err(dev, "unsupported id 0x%x\n", chip_id);
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ret = -ENXIO;
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goto err;
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}
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ret = qt1070_read(data, QT1070_FW_VERSION, &fw_version);
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if (ret) {
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dev_err(dev, "can not read firmware version (%d)\n", ret);
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goto err;
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}
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2013-04-06 07:01:57 +00:00
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dev_add_param_int_ro(dev, "fw_version", fw_version, "0x%x");
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dev_add_param_int_ro(dev, "chip_ip", chip_id, "0x%x");
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2012-11-03 11:26:19 +00:00
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2013-01-13 12:25:38 +00:00
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memcpy(data->code, default_code, sizeof(int) * ARRAY_SIZE(default_code));
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2012-11-03 11:26:19 +00:00
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ret = qt1070_pdata_init(dev, data);
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if (ret) {
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dev_err(dev, "can not get pdata (%d)\n", ret);
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goto err;
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}
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/* Calibrate device */
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ret = qt1070_write(data, QT1070_CALIBRATE_CMD, 1);
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if (ret) {
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dev_err(dev, "can not calibrate the chip (%d)\n", ret);
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goto err;
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}
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data->start = get_time_ns();
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data->fifo_size = 50;
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data->recv_fifo = kfifo_alloc(data->fifo_size);
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data->poller.func = qt1070_calibrate_poller;
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cdev = &data->cdev;
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cdev->dev = dev;
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cdev->tstc = qt1070_tstc;
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cdev->getc = qt1070_getc;
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console_register(&data->cdev);
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ret = poller_register(&data->poller);
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if (ret)
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goto err;
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return 0;
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err:
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free(data);
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return ret;
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}
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static struct driver_d qt1070_driver = {
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.name = "qt1070",
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.probe = qt1070_probe,
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};
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static int qt1070_init(void)
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{
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2013-03-10 06:41:34 +00:00
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i2c_driver_register(&qt1070_driver);
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2012-11-03 11:26:19 +00:00
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return 0;
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}
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device_initcall(qt1070_init);
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