diff options
Diffstat (limited to 'drivers/mfd/intel_soc_pmic_chtwc.c')
| -rw-r--r-- | drivers/mfd/intel_soc_pmic_chtwc.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drivers/mfd/intel_soc_pmic_chtwc.c b/drivers/mfd/intel_soc_pmic_chtwc.c new file mode 100644 index 000000000..b35da01d5 --- /dev/null +++ b/drivers/mfd/intel_soc_pmic_chtwc.c @@ -0,0 +1,230 @@ +/* + * MFD core driver for Intel Cherrytrail Whiskey Cove PMIC + * + * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> + * + * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: + * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/mfd/intel_soc_pmic.h> +#include <linux/regmap.h> + +/* PMIC device registers */ +#define REG_OFFSET_MASK GENMASK(7, 0) +#define REG_ADDR_MASK GENMASK(15, 8) +#define REG_ADDR_SHIFT 8 + +#define CHT_WC_IRQLVL1 0x6e02 +#define CHT_WC_IRQLVL1_MASK 0x6e0e + +/* Whiskey Cove PMIC share same ACPI ID between different platforms */ +#define CHT_WC_HRV 3 + +/* Level 1 IRQs (level 2 IRQs are handled in the child device drivers) */ +enum { + CHT_WC_PWRSRC_IRQ = 0, + CHT_WC_THRM_IRQ, + CHT_WC_BCU_IRQ, + CHT_WC_ADC_IRQ, + CHT_WC_EXT_CHGR_IRQ, + CHT_WC_GPIO_IRQ, + /* There is no irq 6 */ + CHT_WC_CRIT_IRQ = 7, +}; + +static struct resource cht_wc_pwrsrc_resources[] = { + DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ), +}; + +static struct resource cht_wc_ext_charger_resources[] = { + DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ), +}; + +static struct mfd_cell cht_wc_dev[] = { + { + .name = "cht_wcove_pwrsrc", + .num_resources = ARRAY_SIZE(cht_wc_pwrsrc_resources), + .resources = cht_wc_pwrsrc_resources, + }, { + .name = "cht_wcove_ext_chgr", + .num_resources = ARRAY_SIZE(cht_wc_ext_charger_resources), + .resources = cht_wc_ext_charger_resources, + }, + { .name = "cht_wcove_region", }, +}; + +/* + * The CHT Whiskey Cove covers multiple I2C addresses, with a 1 Byte + * register address space per I2C address, so we use 16 bit register + * addresses where the high 8 bits contain the I2C client address. + */ +static int cht_wc_byte_reg_read(void *context, unsigned int reg, + unsigned int *val) +{ + struct i2c_client *client = context; + int ret, orig_addr = client->addr; + + if (!(reg & REG_ADDR_MASK)) { + dev_err(&client->dev, "Error I2C address not specified\n"); + return -EINVAL; + } + + client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT; + ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK); + client->addr = orig_addr; + + if (ret < 0) + return ret; + + *val = ret; + return 0; +} + +static int cht_wc_byte_reg_write(void *context, unsigned int reg, + unsigned int val) +{ + struct i2c_client *client = context; + int ret, orig_addr = client->addr; + + if (!(reg & REG_ADDR_MASK)) { + dev_err(&client->dev, "Error I2C address not specified\n"); + return -EINVAL; + } + + client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT; + ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val); + client->addr = orig_addr; + + return ret; +} + +static const struct regmap_config cht_wc_regmap_cfg = { + .reg_bits = 16, + .val_bits = 8, + .reg_write = cht_wc_byte_reg_write, + .reg_read = cht_wc_byte_reg_read, +}; + +static const struct regmap_irq cht_wc_regmap_irqs[] = { + REGMAP_IRQ_REG(CHT_WC_PWRSRC_IRQ, 0, BIT(CHT_WC_PWRSRC_IRQ)), + REGMAP_IRQ_REG(CHT_WC_THRM_IRQ, 0, BIT(CHT_WC_THRM_IRQ)), + REGMAP_IRQ_REG(CHT_WC_BCU_IRQ, 0, BIT(CHT_WC_BCU_IRQ)), + REGMAP_IRQ_REG(CHT_WC_ADC_IRQ, 0, BIT(CHT_WC_ADC_IRQ)), + REGMAP_IRQ_REG(CHT_WC_EXT_CHGR_IRQ, 0, BIT(CHT_WC_EXT_CHGR_IRQ)), + REGMAP_IRQ_REG(CHT_WC_GPIO_IRQ, 0, BIT(CHT_WC_GPIO_IRQ)), + REGMAP_IRQ_REG(CHT_WC_CRIT_IRQ, 0, BIT(CHT_WC_CRIT_IRQ)), +}; + +static const struct regmap_irq_chip cht_wc_regmap_irq_chip = { + .name = "cht_wc_irq_chip", + .status_base = CHT_WC_IRQLVL1, + .mask_base = CHT_WC_IRQLVL1_MASK, + .irqs = cht_wc_regmap_irqs, + .num_irqs = ARRAY_SIZE(cht_wc_regmap_irqs), + .num_regs = 1, +}; + +static int cht_wc_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct intel_soc_pmic *pmic; + acpi_status status; + unsigned long long hrv; + int ret; + + status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv); + if (ACPI_FAILURE(status)) { + dev_err(dev, "Failed to get PMIC hardware revision\n"); + return -ENODEV; + } + if (hrv != CHT_WC_HRV) { + dev_err(dev, "Invalid PMIC hardware revision: %llu\n", hrv); + return -ENODEV; + } + if (client->irq < 0) { + dev_err(dev, "Invalid IRQ\n"); + return -EINVAL; + } + + pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL); + if (!pmic) + return -ENOMEM; + + pmic->irq = client->irq; + pmic->dev = dev; + i2c_set_clientdata(client, pmic); + + pmic->regmap = devm_regmap_init(dev, NULL, client, &cht_wc_regmap_cfg); + if (IS_ERR(pmic->regmap)) + return PTR_ERR(pmic->regmap); + + ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq, + IRQF_ONESHOT | IRQF_SHARED, 0, + &cht_wc_regmap_irq_chip, + &pmic->irq_chip_data); + if (ret) + return ret; + + return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, + cht_wc_dev, ARRAY_SIZE(cht_wc_dev), NULL, 0, + regmap_irq_get_domain(pmic->irq_chip_data)); +} + +static void cht_wc_shutdown(struct i2c_client *client) +{ + struct intel_soc_pmic *pmic = i2c_get_clientdata(client); + + disable_irq(pmic->irq); +} + +static int __maybe_unused cht_wc_suspend(struct device *dev) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(dev); + + disable_irq(pmic->irq); + + return 0; +} + +static int __maybe_unused cht_wc_resume(struct device *dev) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(dev); + + enable_irq(pmic->irq); + + return 0; +} +static SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume); + +static const struct i2c_device_id cht_wc_i2c_id[] = { + { } +}; + +static const struct acpi_device_id cht_wc_acpi_ids[] = { + { "INT34D3", }, + { } +}; + +static struct i2c_driver cht_wc_driver = { + .driver = { + .name = "CHT Whiskey Cove PMIC", + .pm = &cht_wc_pm_ops, + .acpi_match_table = cht_wc_acpi_ids, + }, + .probe_new = cht_wc_probe, + .shutdown = cht_wc_shutdown, + .id_table = cht_wc_i2c_id, +}; +builtin_i2c_driver(cht_wc_driver); |