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The sparse tool complains as follows: drivers/mfd/ene-kb3930.c:36:15: warning: symbol 'kb3930_power_off' was not declared. Should it be static? The symbol is not used outside of this file. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Lee Jones <lee.jones@linaro.org>
212 lines
4.8 KiB
C
212 lines
4.8 KiB
C
// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later
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/*
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* ENE KB3930 Embedded Controller Driver
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*
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* Copyright (C) 2020 Lubomir Rintel
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*/
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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/* I2C registers that are multiplexing access to the EC RAM. */
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enum {
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EC_DATA_IN = 0x00,
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EC_RAM_OUT = 0x80,
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EC_RAM_IN = 0x81,
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};
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/* EC RAM registers. */
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enum {
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EC_MODEL = 0x30,
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EC_VERSION_MAJ = 0x31,
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EC_VERSION_MIN = 0x32,
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};
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struct kb3930 {
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struct i2c_client *client;
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struct regmap *ram_regmap;
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struct gpio_descs *off_gpios;
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};
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static struct kb3930 *kb3930_power_off;
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#define EC_GPIO_WAVE 0
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#define EC_GPIO_OFF_MODE 1
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#define EC_OFF_MODE_REBOOT 0
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#define EC_OFF_MODE_POWER 1
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static void kb3930_off(struct kb3930 *ddata, int off_mode)
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{
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gpiod_direction_output(ddata->off_gpios->desc[EC_GPIO_OFF_MODE],
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off_mode);
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/*
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* This creates a 10 Hz wave on EC_GPIO_WAVE that signals a
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* shutdown request to the EC. Once the EC detects it, it will
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* proceed to turn the power off or reset the board depending on
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* the value of EC_GPIO_OFF_MODE.
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*/
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while (1) {
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mdelay(50);
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gpiod_direction_output(ddata->off_gpios->desc[EC_GPIO_WAVE], 0);
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mdelay(50);
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gpiod_direction_output(ddata->off_gpios->desc[EC_GPIO_WAVE], 1);
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}
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}
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static int kb3930_restart(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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kb3930_off(kb3930_power_off, EC_OFF_MODE_REBOOT);
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return NOTIFY_DONE;
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}
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static void kb3930_pm_power_off(void)
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{
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kb3930_off(kb3930_power_off, EC_OFF_MODE_POWER);
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}
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static struct notifier_block kb3930_restart_nb = {
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.notifier_call = kb3930_restart,
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};
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static const struct mfd_cell ariel_ec_cells[] = {
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{ .name = "dell-wyse-ariel-led", },
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{ .name = "dell-wyse-ariel-power", },
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};
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static int kb3930_ec_ram_reg_write(void *context, unsigned int reg,
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unsigned int val)
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{
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struct kb3930 *ddata = context;
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return i2c_smbus_write_word_data(ddata->client, EC_RAM_OUT,
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(val << 8) | reg);
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}
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static int kb3930_ec_ram_reg_read(void *context, unsigned int reg,
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unsigned int *val)
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{
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struct kb3930 *ddata = context;
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int ret;
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ret = i2c_smbus_write_word_data(ddata->client, EC_RAM_IN, reg);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_word_data(ddata->client, EC_DATA_IN);
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if (ret < 0)
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return ret;
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*val = ret >> 8;
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return 0;
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}
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static const struct regmap_config kb3930_ram_regmap_config = {
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.name = "ec_ram",
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.reg_bits = 8,
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.val_bits = 8,
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.reg_stride = 1,
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.max_register = 0xff,
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.reg_write = kb3930_ec_ram_reg_write,
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.reg_read = kb3930_ec_ram_reg_read,
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.fast_io = false,
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};
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static int kb3930_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct device_node *np = dev->of_node;
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struct kb3930 *ddata;
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unsigned int model;
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int ret;
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ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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kb3930_power_off = ddata;
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ddata->client = client;
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i2c_set_clientdata(client, ddata);
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ddata->ram_regmap = devm_regmap_init(dev, NULL, ddata,
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&kb3930_ram_regmap_config);
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if (IS_ERR(ddata->ram_regmap))
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return PTR_ERR(ddata->ram_regmap);
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ret = regmap_read(ddata->ram_regmap, EC_MODEL, &model);
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if (ret < 0)
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return ret;
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/* Currently we only support the cells present on Dell Ariel model. */
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if (model != 'J') {
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dev_err(dev, "unknown board model: %02x\n", model);
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return -ENODEV;
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}
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO,
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ariel_ec_cells,
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ARRAY_SIZE(ariel_ec_cells),
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NULL, 0, NULL);
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if (ret)
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return ret;
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if (of_property_read_bool(np, "system-power-controller")) {
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ddata->off_gpios =
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devm_gpiod_get_array_optional(dev, "off", GPIOD_IN);
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if (IS_ERR(ddata->off_gpios))
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return PTR_ERR(ddata->off_gpios);
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if (ddata->off_gpios->ndescs < 2) {
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dev_err(dev, "invalid off-gpios property\n");
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return -EINVAL;
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}
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}
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if (ddata->off_gpios) {
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register_restart_handler(&kb3930_restart_nb);
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if (!pm_power_off)
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pm_power_off = kb3930_pm_power_off;
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}
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return 0;
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}
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static int kb3930_remove(struct i2c_client *client)
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{
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struct kb3930 *ddata = i2c_get_clientdata(client);
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if (ddata->off_gpios) {
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if (pm_power_off == kb3930_pm_power_off)
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pm_power_off = NULL;
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unregister_restart_handler(&kb3930_restart_nb);
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}
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kb3930_power_off = NULL;
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return 0;
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}
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static const struct of_device_id kb3930_dt_ids[] = {
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{ .compatible = "ene,kb3930" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, kb3930_dt_ids);
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static struct i2c_driver kb3930_driver = {
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.probe_new = kb3930_probe,
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.remove = kb3930_remove,
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.driver = {
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.name = "ene-kb3930",
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.of_match_table = kb3930_dt_ids,
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},
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};
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module_i2c_driver(kb3930_driver);
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MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
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MODULE_DESCRIPTION("ENE KB3930 Embedded Controller Driver");
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MODULE_LICENSE("Dual BSD/GPL");
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