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![Wei Yongjun](/assets/img/avatar_default.png)
In case of error, the function devm_ioremap_resource() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Also remove unneeded error handling of platform_get_resource(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Lee Jones <lee.jones@linaro.org>
185 lines
4.8 KiB
C
185 lines
4.8 KiB
C
/*
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* Device driver for MFD hi655x PMIC
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*
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* Copyright (c) 2016 Hisilicon.
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*
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* Authors:
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* Chen Feng <puck.chen@hisilicon.com>
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* Fei Wang <w.f@huawei.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/hi655x-pmic.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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static const struct regmap_irq hi655x_irqs[] = {
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{ .reg_offset = 0, .mask = OTMP_D1R_INT_MASK },
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{ .reg_offset = 0, .mask = VSYS_2P5_R_INT_MASK },
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{ .reg_offset = 0, .mask = VSYS_UV_D3R_INT_MASK },
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{ .reg_offset = 0, .mask = VSYS_6P0_D200UR_INT_MASK },
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{ .reg_offset = 0, .mask = PWRON_D4SR_INT_MASK },
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{ .reg_offset = 0, .mask = PWRON_D20F_INT_MASK },
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{ .reg_offset = 0, .mask = PWRON_D20R_INT_MASK },
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{ .reg_offset = 0, .mask = RESERVE_INT_MASK },
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};
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static const struct regmap_irq_chip hi655x_irq_chip = {
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.name = "hi655x-pmic",
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.irqs = hi655x_irqs,
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.num_regs = 1,
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.num_irqs = ARRAY_SIZE(hi655x_irqs),
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.status_base = HI655X_IRQ_STAT_BASE,
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.ack_base = HI655X_IRQ_STAT_BASE,
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.mask_base = HI655X_IRQ_MASK_BASE,
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};
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static struct regmap_config hi655x_regmap_config = {
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.reg_bits = 32,
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.reg_stride = HI655X_STRIDE,
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.val_bits = 8,
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.max_register = HI655X_BUS_ADDR(0xFFF),
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};
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static struct resource pwrkey_resources[] = {
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{
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.name = "down",
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.start = PWRON_D20R_INT,
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.end = PWRON_D20R_INT,
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.flags = IORESOURCE_IRQ,
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}, {
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.name = "up",
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.start = PWRON_D20F_INT,
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.end = PWRON_D20F_INT,
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.flags = IORESOURCE_IRQ,
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}, {
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.name = "hold 4s",
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.start = PWRON_D4SR_INT,
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.end = PWRON_D4SR_INT,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct mfd_cell hi655x_pmic_devs[] = {
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{
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.name = "hi65xx-powerkey",
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.num_resources = ARRAY_SIZE(pwrkey_resources),
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.resources = &pwrkey_resources[0],
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},
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{ .name = "hi655x-regulator", },
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};
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static void hi655x_local_irq_clear(struct regmap *map)
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{
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int i;
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regmap_write(map, HI655X_ANA_IRQM_BASE, HI655X_IRQ_CLR);
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for (i = 0; i < HI655X_IRQ_ARRAY; i++) {
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regmap_write(map, HI655X_IRQ_STAT_BASE + i * HI655X_STRIDE,
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HI655X_IRQ_CLR);
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}
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}
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static int hi655x_pmic_probe(struct platform_device *pdev)
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{
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int ret;
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struct hi655x_pmic *pmic;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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void __iomem *base;
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pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
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if (!pmic)
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return -ENOMEM;
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pmic->dev = dev;
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pmic->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, pmic->res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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pmic->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
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&hi655x_regmap_config);
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regmap_read(pmic->regmap, HI655X_BUS_ADDR(HI655X_VER_REG), &pmic->ver);
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if ((pmic->ver < PMU_VER_START) || (pmic->ver > PMU_VER_END)) {
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dev_warn(dev, "PMU version %d unsupported\n", pmic->ver);
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return -EINVAL;
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}
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hi655x_local_irq_clear(pmic->regmap);
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pmic->gpio = of_get_named_gpio(np, "pmic-gpios", 0);
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if (!gpio_is_valid(pmic->gpio)) {
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dev_err(dev, "Failed to get the pmic-gpios\n");
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return -ENODEV;
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}
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ret = devm_gpio_request_one(dev, pmic->gpio, GPIOF_IN,
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"hi655x_pmic_irq");
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if (ret < 0) {
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dev_err(dev, "Failed to request gpio %d ret = %d\n",
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pmic->gpio, ret);
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return ret;
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}
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ret = regmap_add_irq_chip(pmic->regmap, gpio_to_irq(pmic->gpio),
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IRQF_TRIGGER_LOW | IRQF_NO_SUSPEND, 0,
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&hi655x_irq_chip, &pmic->irq_data);
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if (ret) {
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dev_err(dev, "Failed to obtain 'hi655x_pmic_irq' %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, pmic);
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ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
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ARRAY_SIZE(hi655x_pmic_devs), NULL, 0,
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regmap_irq_get_domain(pmic->irq_data));
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if (ret) {
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dev_err(dev, "Failed to register device %d\n", ret);
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regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
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return ret;
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}
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return 0;
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}
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static int hi655x_pmic_remove(struct platform_device *pdev)
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{
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struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
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regmap_del_irq_chip(gpio_to_irq(pmic->gpio), pmic->irq_data);
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mfd_remove_devices(&pdev->dev);
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return 0;
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}
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static const struct of_device_id hi655x_pmic_match[] = {
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{ .compatible = "hisilicon,hi655x-pmic", },
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{},
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};
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static struct platform_driver hi655x_pmic_driver = {
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.driver = {
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.name = "hi655x-pmic",
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.of_match_table = of_match_ptr(hi655x_pmic_match),
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},
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.probe = hi655x_pmic_probe,
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.remove = hi655x_pmic_remove,
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};
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module_platform_driver(hi655x_pmic_driver);
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MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
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MODULE_DESCRIPTION("Hisilicon hi655x PMIC driver");
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MODULE_LICENSE("GPL v2");
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