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path: root/drivers/mfd/rohm-bd718x7.c
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Diffstat (limited to 'drivers/mfd/rohm-bd718x7.c')
-rw-r--r--drivers/mfd/rohm-bd718x7.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c
new file mode 100644
index 0000000000..4798bdf27a
--- /dev/null
+++ b/drivers/mfd/rohm-bd718x7.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// Copyright (C) 2018 ROHM Semiconductors
+//
+// ROHM BD71837MWV and BD71847MWV PMIC driver
+//
+// Datasheet for BD71837MWV available from
+// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
+
+#include <linux/gpio_keys.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/rohm-bd718x7.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+static struct gpio_keys_button button = {
+ .code = KEY_POWER,
+ .gpio = -1,
+ .type = EV_KEY,
+};
+
+static struct gpio_keys_platform_data bd718xx_powerkey_data = {
+ .buttons = &button,
+ .nbuttons = 1,
+ .name = "bd718xx-pwrkey",
+};
+
+static struct mfd_cell bd71837_mfd_cells[] = {
+ {
+ .name = "gpio-keys",
+ .platform_data = &bd718xx_powerkey_data,
+ .pdata_size = sizeof(bd718xx_powerkey_data),
+ },
+ { .name = "bd71837-clk", },
+ { .name = "bd71837-pmic", },
+};
+
+static struct mfd_cell bd71847_mfd_cells[] = {
+ {
+ .name = "gpio-keys",
+ .platform_data = &bd718xx_powerkey_data,
+ .pdata_size = sizeof(bd718xx_powerkey_data),
+ },
+ { .name = "bd71847-clk", },
+ { .name = "bd71847-pmic", },
+};
+
+static const struct regmap_irq bd718xx_irqs[] = {
+ REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
+ REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
+};
+
+static struct regmap_irq_chip bd718xx_irq_chip = {
+ .name = "bd718xx-irq",
+ .irqs = bd718xx_irqs,
+ .num_irqs = ARRAY_SIZE(bd718xx_irqs),
+ .num_regs = 1,
+ .irq_reg_stride = 1,
+ .status_base = BD718XX_REG_IRQ,
+ .mask_base = BD718XX_REG_MIRQ,
+ .ack_base = BD718XX_REG_IRQ,
+ .init_ack_masked = true,
+};
+
+static const struct regmap_range pmic_status_range = {
+ .range_min = BD718XX_REG_IRQ,
+ .range_max = BD718XX_REG_POW_STATE,
+};
+
+static const struct regmap_access_table volatile_regs = {
+ .yes_ranges = &pmic_status_range,
+ .n_yes_ranges = 1,
+};
+
+static const struct regmap_config bd718xx_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &volatile_regs,
+ .max_register = BD718XX_MAX_REGISTER - 1,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int bd718xx_init_press_duration(struct regmap *regmap,
+ struct device *dev)
+{
+ u32 short_press_ms, long_press_ms;
+ u32 short_press_value, long_press_value;
+ int ret;
+
+ ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
+ &short_press_ms);
+ if (!ret) {
+ short_press_value = min(15u, (short_press_ms + 250) / 500);
+ ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
+ BD718XX_PWRBTN_PRESS_DURATION_MASK,
+ short_press_value);
+ if (ret) {
+ dev_err(dev, "Failed to init pwron short press\n");
+ return ret;
+ }
+ }
+
+ ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
+ &long_press_ms);
+ if (!ret) {
+ long_press_value = min(15u, (long_press_ms + 500) / 1000);
+ ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
+ BD718XX_PWRBTN_PRESS_DURATION_MASK,
+ long_press_value);
+ if (ret) {
+ dev_err(dev, "Failed to init pwron long press\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int bd718xx_i2c_probe(struct i2c_client *i2c)
+{
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *irq_data;
+ int ret;
+ unsigned int chip_type;
+ struct mfd_cell *mfd;
+ int cells;
+
+ if (!i2c->irq) {
+ dev_err(&i2c->dev, "No IRQ configured\n");
+ return -EINVAL;
+ }
+ chip_type = (unsigned int)(uintptr_t)
+ of_device_get_match_data(&i2c->dev);
+ switch (chip_type) {
+ case ROHM_CHIP_TYPE_BD71837:
+ mfd = bd71837_mfd_cells;
+ cells = ARRAY_SIZE(bd71837_mfd_cells);
+ break;
+ case ROHM_CHIP_TYPE_BD71847:
+ mfd = bd71847_mfd_cells;
+ cells = ARRAY_SIZE(bd71847_mfd_cells);
+ break;
+ default:
+ dev_err(&i2c->dev, "Unknown device type");
+ return -EINVAL;
+ }
+
+ regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
+ "regmap initialization failed\n");
+
+ ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
+ IRQF_ONESHOT, 0, &bd718xx_irq_chip,
+ &irq_data);
+ if (ret)
+ return dev_err_probe(&i2c->dev, ret, "Failed to add irq_chip\n");
+
+ ret = bd718xx_init_press_duration(regmap, &i2c->dev);
+ if (ret)
+ return ret;
+
+ ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
+
+ if (ret < 0)
+ return dev_err_probe(&i2c->dev, ret, "Failed to get the IRQ\n");
+
+ button.irq = ret;
+
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
+ mfd, cells, NULL, 0,
+ regmap_irq_get_domain(irq_data));
+ if (ret)
+ dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
+
+ return ret;
+}
+
+static const struct of_device_id bd718xx_of_match[] = {
+ {
+ .compatible = "rohm,bd71837",
+ .data = (void *)ROHM_CHIP_TYPE_BD71837,
+ },
+ {
+ .compatible = "rohm,bd71847",
+ .data = (void *)ROHM_CHIP_TYPE_BD71847,
+ },
+ {
+ .compatible = "rohm,bd71850",
+ .data = (void *)ROHM_CHIP_TYPE_BD71847,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bd718xx_of_match);
+
+static struct i2c_driver bd718xx_i2c_driver = {
+ .driver = {
+ .name = "rohm-bd718x7",
+ .of_match_table = bd718xx_of_match,
+ },
+ .probe = bd718xx_i2c_probe,
+};
+
+static int __init bd718xx_i2c_init(void)
+{
+ return i2c_add_driver(&bd718xx_i2c_driver);
+}
+
+/* Initialise early so consumer devices can complete system boot */
+subsys_initcall(bd718xx_i2c_init);
+
+static void __exit bd718xx_i2c_exit(void)
+{
+ i2c_del_driver(&bd718xx_i2c_driver);
+}
+module_exit(bd718xx_i2c_exit);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
+MODULE_LICENSE("GPL");