153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Maxim MAX77714 Core Driver
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*
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* Copyright (C) 2022 Luca Ceresoli
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* Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max77714.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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static const struct mfd_cell max77714_cells[] = {
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{ .name = "max77714-watchdog" },
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{ .name = "max77714-rtc" },
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};
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static const struct regmap_range max77714_readable_ranges[] = {
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regmap_reg_range(MAX77714_INT_TOP, MAX77714_INT_TOP),
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regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
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regmap_reg_range(MAX77714_32K_STATUS, MAX77714_32K_CONFIG),
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regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
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};
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static const struct regmap_range max77714_writable_ranges[] = {
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regmap_reg_range(MAX77714_INT_TOPM, MAX77714_INT_TOPM),
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regmap_reg_range(MAX77714_32K_CONFIG, MAX77714_32K_CONFIG),
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regmap_reg_range(MAX77714_CNFG_GLBL2, MAX77714_CNFG2_ONOFF),
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};
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static const struct regmap_access_table max77714_readable_table = {
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.yes_ranges = max77714_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(max77714_readable_ranges),
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};
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static const struct regmap_access_table max77714_writable_table = {
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.yes_ranges = max77714_writable_ranges,
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.n_yes_ranges = ARRAY_SIZE(max77714_writable_ranges),
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};
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static const struct regmap_config max77714_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = MAX77714_CNFG2_ONOFF,
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.rd_table = &max77714_readable_table,
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.wr_table = &max77714_writable_table,
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};
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static const struct regmap_irq max77714_top_irqs[] = {
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_ONOFF, 0, MAX77714_INT_TOP_ONOFF),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_RTC, 0, MAX77714_INT_TOP_RTC),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GPIO, 0, MAX77714_INT_TOP_GPIO),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_LDO, 0, MAX77714_INT_TOP_LDO),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_SD, 0, MAX77714_INT_TOP_SD),
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REGMAP_IRQ_REG(MAX77714_IRQ_TOP_GLBL, 0, MAX77714_INT_TOP_GLBL),
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};
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static const struct regmap_irq_chip max77714_irq_chip = {
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.name = "max77714-pmic",
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.status_base = MAX77714_INT_TOP,
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.mask_base = MAX77714_INT_TOPM,
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.num_regs = 1,
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.irqs = max77714_top_irqs,
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.num_irqs = ARRAY_SIZE(max77714_top_irqs),
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};
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/*
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* MAX77714 initially uses the internal, low precision oscillator. Enable
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* the external oscillator by setting the XOSC_RETRY bit. If the external
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* oscillator is not OK (probably not installed) this has no effect.
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*/
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static int max77714_setup_xosc(struct device *dev, struct regmap *regmap)
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{
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/* Internal Crystal Load Capacitance, indexed by value of 32KLOAD bits */
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static const unsigned int load_cap[4] = {0, 10, 12, 22}; /* pF */
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unsigned int load_cap_idx;
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unsigned int status;
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int err;
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err = regmap_update_bits(regmap, MAX77714_32K_CONFIG,
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MAX77714_32K_CONFIG_XOSC_RETRY,
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MAX77714_32K_CONFIG_XOSC_RETRY);
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if (err)
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return dev_err_probe(dev, err, "Failed to configure the external oscillator\n");
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err = regmap_read(regmap, MAX77714_32K_STATUS, &status);
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if (err)
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return dev_err_probe(dev, err, "Failed to read external oscillator status\n");
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load_cap_idx = (status >> MAX77714_32K_STATUS_32KLOAD_SHF)
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& MAX77714_32K_STATUS_32KLOAD_MSK;
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dev_info(dev, "Using %s oscillator, %d pF load cap\n",
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status & MAX77714_32K_STATUS_32KSOURCE ? "internal" : "external",
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load_cap[load_cap_idx]);
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return 0;
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}
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static int max77714_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct regmap *regmap;
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struct regmap_irq_chip_data *irq_data;
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int err;
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regmap = devm_regmap_init_i2c(client, &max77714_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Failed to initialise regmap\n");
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err = max77714_setup_xosc(dev, regmap);
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if (err)
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return err;
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err = devm_regmap_add_irq_chip(dev, regmap, client->irq,
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IRQF_ONESHOT | IRQF_SHARED, 0,
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&max77714_irq_chip, &irq_data);
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if (err)
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return dev_err_probe(dev, err, "Failed to add PMIC IRQ chip\n");
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err = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
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max77714_cells, ARRAY_SIZE(max77714_cells),
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NULL, 0, NULL);
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if (err)
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return dev_err_probe(dev, err, "Failed to register child devices\n");
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return 0;
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}
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static const struct of_device_id max77714_dt_match[] = {
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{ .compatible = "maxim,max77714" },
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{},
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};
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MODULE_DEVICE_TABLE(of, max77714_dt_match);
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static struct i2c_driver max77714_driver = {
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.driver = {
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.name = "max77714",
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.of_match_table = max77714_dt_match,
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},
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.probe = max77714_probe,
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};
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module_i2c_driver(max77714_driver);
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MODULE_DESCRIPTION("Maxim MAX77714 MFD core driver");
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MODULE_AUTHOR("Luca Ceresoli <luca.ceresoli@bootlin.com>");
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MODULE_LICENSE("GPL");
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