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authorGuodong Xu <guodong.xu@linaro.org>2014-09-01 16:28:34 +0800
committerLee Jones <lee.jones@linaro.org>2014-09-26 08:23:43 +0100
commit8bdf87b400271ebc7fbf71e117c299d19a97ebb4 (patch)
tree236c32fe5eaf83e13a949cf95a8068afd92f9a68 /drivers/mfd/hi6421-pmic-core.c
parent0709b048cea5a368e078e10fa25adc030392125a (diff)
downloadlinux-8bdf87b400271ebc7fbf71e117c299d19a97ebb4.tar.bz2
mfd: Add HI6421 PMIC Core driver
This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi- functions, such as regulators, codec, ADCs, Coulomb counter, etc. This driver includes core APIs _only_. Drivers for individul components, like voltage regulators, are implemented in corresponding driver directories and files. Registers in Hi6421 are memory mapped, so using regmap-mmio API. Signed-off-by: Guodong Xu <guodong.xu@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/hi6421-pmic-core.c')
-rw-r--r--drivers/mfd/hi6421-pmic-core.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c
new file mode 100644
index 000000000000..321a2656fd00
--- /dev/null
+++ b/drivers/mfd/hi6421-pmic-core.c
@@ -0,0 +1,113 @@
+/*
+ * Device driver for Hi6421 IC
+ *
+ * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
+ * http://www.hisilicon.com
+ * Copyright (c) <2013-2014> Linaro Ltd.
+ * http://www.linaro.org
+ *
+ * Author: Guodong Xu <guodong.xu@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/hi6421-pmic.h>
+
+static const struct mfd_cell hi6421_devs[] = {
+ { .name = "hi6421-regulator", },
+};
+
+static struct regmap_config hi6421_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 8,
+ .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
+};
+
+static int hi6421_pmic_probe(struct platform_device *pdev)
+{
+ struct hi6421_pmic *pmic;
+ struct resource *res;
+ void __iomem *base;
+ int ret;
+
+ pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
+ if (!pmic)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
+ &hi6421_regmap_config);
+ if (IS_ERR(pmic->regmap)) {
+ dev_err(&pdev->dev,
+ "regmap init failed: %ld\n", PTR_ERR(pmic->regmap));
+ return PTR_ERR(pmic->regmap);
+ }
+
+ /* set over-current protection debounce 8ms */
+ regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
+ (HI6421_OCP_DEB_SEL_MASK
+ | HI6421_OCP_EN_DEBOUNCE_MASK
+ | HI6421_OCP_AUTO_STOP_MASK),
+ (HI6421_OCP_DEB_SEL_8MS
+ | HI6421_OCP_EN_DEBOUNCE_ENABLE));
+
+ platform_set_drvdata(pdev, pmic);
+
+ ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs,
+ ARRAY_SIZE(hi6421_devs), NULL, 0, NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int hi6421_pmic_remove(struct platform_device *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+
+ return 0;
+}
+
+static struct of_device_id of_hi6421_pmic_match_tbl[] = {
+ { .compatible = "hisilicon,hi6421-pmic", },
+ { },
+};
+
+static struct platform_driver hi6421_pmic_driver = {
+ .driver = {
+ .name = "hi6421_pmic",
+ .of_match_table = of_hi6421_pmic_match_tbl,
+ },
+ .probe = hi6421_pmic_probe,
+ .remove = hi6421_pmic_remove,
+};
+module_platform_driver(hi6421_pmic_driver);
+
+MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
+MODULE_DESCRIPTION("Hi6421 PMIC driver");
+MODULE_LICENSE("GPL v2");