diff options
Diffstat (limited to 'drivers/mfd/max8925-i2c.c')
| -rw-r--r-- | drivers/mfd/max8925-i2c.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/drivers/mfd/max8925-i2c.c b/drivers/mfd/max8925-i2c.c new file mode 100644 index 000000000..114e905be --- /dev/null +++ b/drivers/mfd/max8925-i2c.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * I2C driver for Maxim MAX8925 + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang <haojian.zhuang@marvell.com> + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/mfd/max8925.h> +#include <linux/slab.h> + +#define RTC_I2C_ADDR 0x68 +#define ADC_I2C_ADDR 0x47 + +static inline int max8925_read_device(struct i2c_client *i2c, + int reg, int bytes, void *dest) +{ + int ret; + + if (bytes > 1) + ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest); + else { + ret = i2c_smbus_read_byte_data(i2c, reg); + if (ret < 0) + return ret; + *(unsigned char *)dest = (unsigned char)ret; + } + return ret; +} + +static inline int max8925_write_device(struct i2c_client *i2c, + int reg, int bytes, void *src) +{ + unsigned char buf[9]; + int ret; + + buf[0] = (unsigned char)reg; + memcpy(&buf[1], src, bytes); + + ret = i2c_master_send(i2c, buf, bytes + 1); + if (ret < 0) + return ret; + return 0; +} + +int max8925_reg_read(struct i2c_client *i2c, int reg) +{ + struct max8925_chip *chip = i2c_get_clientdata(i2c); + unsigned char data = 0; + int ret; + + mutex_lock(&chip->io_lock); + ret = max8925_read_device(i2c, reg, 1, &data); + mutex_unlock(&chip->io_lock); + + if (ret < 0) + return ret; + else + return (int)data; +} +EXPORT_SYMBOL(max8925_reg_read); + +int max8925_reg_write(struct i2c_client *i2c, int reg, + unsigned char data) +{ + struct max8925_chip *chip = i2c_get_clientdata(i2c); + int ret; + + mutex_lock(&chip->io_lock); + ret = max8925_write_device(i2c, reg, 1, &data); + mutex_unlock(&chip->io_lock); + + return ret; +} +EXPORT_SYMBOL(max8925_reg_write); + +int max8925_bulk_read(struct i2c_client *i2c, int reg, + int count, unsigned char *buf) +{ + struct max8925_chip *chip = i2c_get_clientdata(i2c); + int ret; + + mutex_lock(&chip->io_lock); + ret = max8925_read_device(i2c, reg, count, buf); + mutex_unlock(&chip->io_lock); + + return ret; +} +EXPORT_SYMBOL(max8925_bulk_read); + +int max8925_bulk_write(struct i2c_client *i2c, int reg, + int count, unsigned char *buf) +{ + struct max8925_chip *chip = i2c_get_clientdata(i2c); + int ret; + + mutex_lock(&chip->io_lock); + ret = max8925_write_device(i2c, reg, count, buf); + mutex_unlock(&chip->io_lock); + + return ret; +} +EXPORT_SYMBOL(max8925_bulk_write); + +int max8925_set_bits(struct i2c_client *i2c, int reg, + unsigned char mask, unsigned char data) +{ + struct max8925_chip *chip = i2c_get_clientdata(i2c); + unsigned char value; + int ret; + + mutex_lock(&chip->io_lock); + ret = max8925_read_device(i2c, reg, 1, &value); + if (ret < 0) + goto out; + value &= ~mask; + value |= data; + ret = max8925_write_device(i2c, reg, 1, &value); +out: + mutex_unlock(&chip->io_lock); + return ret; +} +EXPORT_SYMBOL(max8925_set_bits); + + +static const struct i2c_device_id max8925_id_table[] = { + { "max8925", 0 }, + { }, +}; + +static int max8925_dt_init(struct device_node *np, struct device *dev, + struct max8925_platform_data *pdata) +{ + int ret; + + ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq); + if (ret) { + dev_err(dev, "Not found maxim,tsc-irq property\n"); + return -EINVAL; + } + return 0; +} + +static int max8925_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct max8925_platform_data *pdata = dev_get_platdata(&client->dev); + struct max8925_chip *chip; + struct device_node *node = client->dev.of_node; + + if (node && !pdata) { + /* parse DT to get platform data */ + pdata = devm_kzalloc(&client->dev, + sizeof(struct max8925_platform_data), + GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + if (max8925_dt_init(node, &client->dev, pdata)) + return -EINVAL; + } else if (!pdata) { + pr_info("%s: platform data is missing\n", __func__); + return -EINVAL; + } + + chip = devm_kzalloc(&client->dev, + sizeof(struct max8925_chip), GFP_KERNEL); + if (chip == NULL) + return -ENOMEM; + chip->i2c = client; + chip->dev = &client->dev; + i2c_set_clientdata(client, chip); + dev_set_drvdata(chip->dev, chip); + mutex_init(&chip->io_lock); + + chip->rtc = i2c_new_dummy_device(chip->i2c->adapter, RTC_I2C_ADDR); + if (IS_ERR(chip->rtc)) { + dev_err(chip->dev, "Failed to allocate I2C device for RTC\n"); + return PTR_ERR(chip->rtc); + } + i2c_set_clientdata(chip->rtc, chip); + + chip->adc = i2c_new_dummy_device(chip->i2c->adapter, ADC_I2C_ADDR); + if (IS_ERR(chip->adc)) { + dev_err(chip->dev, "Failed to allocate I2C device for ADC\n"); + i2c_unregister_device(chip->rtc); + return PTR_ERR(chip->adc); + } + i2c_set_clientdata(chip->adc, chip); + + device_init_wakeup(&client->dev, 1); + + max8925_device_init(chip, pdata); + + return 0; +} + +static int max8925_remove(struct i2c_client *client) +{ + struct max8925_chip *chip = i2c_get_clientdata(client); + + max8925_device_exit(chip); + i2c_unregister_device(chip->adc); + i2c_unregister_device(chip->rtc); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int max8925_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max8925_chip *chip = i2c_get_clientdata(client); + + if (device_may_wakeup(dev) && chip->wakeup_flag) + enable_irq_wake(chip->core_irq); + return 0; +} + +static int max8925_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct max8925_chip *chip = i2c_get_clientdata(client); + + if (device_may_wakeup(dev) && chip->wakeup_flag) + disable_irq_wake(chip->core_irq); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume); + +static const struct of_device_id max8925_dt_ids[] = { + { .compatible = "maxim,max8925", }, + {}, +}; + +static struct i2c_driver max8925_driver = { + .driver = { + .name = "max8925", + .pm = &max8925_pm_ops, + .of_match_table = max8925_dt_ids, + }, + .probe = max8925_probe, + .remove = max8925_remove, + .id_table = max8925_id_table, +}; + +static int __init max8925_i2c_init(void) +{ + int ret; + + ret = i2c_add_driver(&max8925_driver); + if (ret != 0) + pr_err("Failed to register MAX8925 I2C driver: %d\n", ret); + + return ret; +} +subsys_initcall(max8925_i2c_init); |