// SPDX-License-Identifier: GPL-2.0
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/*
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* Rockchip RK803 driver
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*
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* Copyright (C) 2021 Rockchip Electronics Co., Ltd.
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*
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*/
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#include <linux/fs.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <uapi/linux/rk803.h>
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#define RK803_CHIPID1 0x0A
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#define RK803_CHIPID2 0x0B
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#define IR_LED_DEFAULT_CURRENT LED_500MA
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#define PRO_LED_DEFAULT_CURRENT LED_600MA
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#define RK803_TIMEOUT 1000 /* usec */
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enum SL_LED_CURRENT {
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LED_0MA = 0,
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LED_100MA,
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LED_200MA,
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LED_300MA,
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LED_400MA,
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LED_500MA,
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LED_600MA,
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LED_700MA,
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LED_800MA,
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LED_900MA,
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LED_1000MA,
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LED_1100MA,
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LED_1200MA,
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LED_1300MA,
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LED_1400MA,
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LED_1544MA = 15,
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LED_1600MA,
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LED_1700MA,
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LED_1800MA,
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LED_1900MA,
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LED_2000MA = 20,
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LED_2100MA,
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LED_2200MA,
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LED_2300MA,
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LED_2400MA,
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LED_2500MA,
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LED_2600MA,
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LED_2700MA,
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LED_2800MA,
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LED_2900MA,
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LED_3000MA = 30,
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LED_3100MA,
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LED_3200MA
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};
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struct rk803_data {
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struct i2c_client *client;
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struct regmap *regmap;
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unsigned short chip_id;
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unsigned char current1;
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unsigned char current2;
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struct gpio_desc *gpio_encc1;
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struct gpio_desc *gpio_encc2;
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struct miscdevice misc;
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};
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static const struct of_device_id rk803_of_match[] = {
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{ .compatible = "rockchip,rk803" },
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{ },
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};
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static ssize_t
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rk803_i2c_write_reg(struct rk803_data *rk803, uint8_t reg, uint8_t val)
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{
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unsigned long timeout, write_time;
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struct i2c_client *client;
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struct regmap *regmap;
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int ret;
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regmap = rk803->regmap;
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client = rk803->client;
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timeout = jiffies + msecs_to_jiffies(25);
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do {
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/*
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* The timestamp shall be taken before the actual operation
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* to avoid a premature timeout in case of high CPU load.
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*/
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write_time = jiffies;
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ret = regmap_write(regmap, reg, val);
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dev_dbg(&client->dev, "write %xu@%d --> %d (%ld)\n",
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val, reg, ret, jiffies);
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if (!ret)
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return 1;
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usleep_range(1000, 1500);
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} while (time_before(write_time, timeout));
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return -ETIMEDOUT;
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}
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static long rk803_dev_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int ret = 0;
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struct rk803_data *rk803 =
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container_of(file->private_data, struct rk803_data, misc);
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switch (cmd) {
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case RK803_SET_GPIO1: {
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int val = (int)arg;
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gpiod_set_value(rk803->gpio_encc1, val);
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break;
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}
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case RK803_SET_GPIO2: {
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int val = (int)arg;
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gpiod_set_value(rk803->gpio_encc2, val);
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break;
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}
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case RK803_SET_CURENT1: {
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int val = (int)arg;
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rk803->current1 = val;
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rk803_i2c_write_reg(rk803, 0, rk803->current1);
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break;
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}
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case RK803_SET_CURENT2: {
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int val = (int)arg;
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rk803->current2 = val;
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rk803_i2c_write_reg(rk803, 0, rk803->current2);
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break;
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}
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default:
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ret = -EFAULT;
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break;
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}
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return ret;
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}
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static const struct file_operations rk803_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = rk803_dev_ioctl,
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};
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static int
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rk803_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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//struct device_node *np = client->dev.of_node;
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struct device *dev = &client->dev;
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int msb, lsb;
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unsigned short chipid;
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struct rk803_data *rk803;
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struct regmap *regmap;
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struct regmap_config regmap_config = { };
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int ret;
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/* check chip id */
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msb = i2c_smbus_read_byte_data(client, RK803_CHIPID1);
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if (msb < 0) {
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dev_err(dev, "failed to read the chip1 id at 0x%x\n",
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RK803_CHIPID1);
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return msb;
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}
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lsb = i2c_smbus_read_byte_data(client, RK803_CHIPID2);
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if (lsb < 0) {
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dev_err(dev, "failed to read the chip2 id at 0x%x\n",
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RK803_CHIPID2);
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return lsb;
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}
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chipid = ((msb << 8) | lsb);
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dev_info(dev, "chip id: 0x%x\n", (unsigned int)chipid);
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regmap_config.val_bits = 8;
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regmap_config.reg_bits = 8;
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regmap_config.disable_locking = true;
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regmap = devm_regmap_init_i2c(client, ®map_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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rk803 = devm_kzalloc(dev, sizeof(*rk803), GFP_KERNEL);
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if (!rk803)
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return -ENOMEM;
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rk803->chip_id = chipid;
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rk803->client = client;
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rk803->regmap = regmap;
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rk803->current1 = IR_LED_DEFAULT_CURRENT;
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rk803->current2 = PRO_LED_DEFAULT_CURRENT;
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rk803->gpio_encc1 = devm_gpiod_get(dev, "gpio-encc1", GPIOD_OUT_LOW);
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if (IS_ERR(rk803->gpio_encc1)) {
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dev_err(dev, "can not find gpio_encc1\n");
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return PTR_ERR(rk803->gpio_encc1);
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}
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rk803->gpio_encc2 = devm_gpiod_get(dev, "gpio-encc2", GPIOD_OUT_LOW);
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if (IS_ERR(rk803->gpio_encc2)) {
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dev_err(dev, "can not find gpio_encc2\n");
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return PTR_ERR(rk803->gpio_encc2);
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}
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/* OVP */
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rk803_i2c_write_reg(rk803, 4, 1);
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/* Control time */
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rk803_i2c_write_reg(rk803, 2, 0xe3);
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/* Control CV */
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rk803_i2c_write_reg(rk803, 3, 0xa7);
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/* PRO */
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rk803_i2c_write_reg(rk803, 0, PRO_LED_DEFAULT_CURRENT);
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/* IR */
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rk803_i2c_write_reg(rk803, 1, IR_LED_DEFAULT_CURRENT);
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i2c_set_clientdata(client, rk803);
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rk803->misc.minor = MISC_DYNAMIC_MINOR;
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rk803->misc.name = "rk803";
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rk803->misc.fops = &rk803_fops;
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ret = misc_register(&rk803->misc);
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if (ret < 0) {
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dev_err(&client->dev, "Error: misc_register returned %d\n",
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ret);
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return ret;
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}
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dev_info(dev, "rk803 probe ok!\n");
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return 0;
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}
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static int rk803_remove(struct i2c_client *client)
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{
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struct rk803_data *rk803;
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rk803 = i2c_get_clientdata(client);
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misc_deregister(&rk803->misc);
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i2c_unregister_device(rk803->client);
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return 0;
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}
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static struct i2c_driver rk803_driver = {
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.driver = {
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.name = "rk803",
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.of_match_table = rk803_of_match,
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},
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.probe = rk803_probe,
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.remove = rk803_remove,
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};
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static int __init rk803_init(void)
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{
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return i2c_add_driver(&rk803_driver);
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}
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subsys_initcall(rk803_init);
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static void __exit rk803_exit(void)
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{
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i2c_del_driver(&rk803_driver);
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}
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module_exit(rk803_exit);
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MODULE_DESCRIPTION("Driver for RK803");
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MODULE_AUTHOR("Rockchip");
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MODULE_LICENSE("GPL");
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