264 lines
6.6 KiB
C
264 lines
6.6 KiB
C
/*
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* Copyright (C) 2017 Spreadtrum Communications Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#define SPRD_PMIC_INT_MASK_STATUS 0x0
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#define SPRD_PMIC_INT_RAW_STATUS 0x4
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#define SPRD_PMIC_INT_EN 0x8
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#define SPRD_SC2731_IRQ_BASE 0x140
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#define SPRD_SC2731_IRQ_NUMS 16
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struct sprd_pmic {
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struct regmap *regmap;
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struct device *dev;
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struct regmap_irq *irqs;
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struct regmap_irq_chip irq_chip;
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struct regmap_irq_chip_data *irq_data;
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int irq;
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};
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struct sprd_pmic_data {
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u32 irq_base;
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u32 num_irqs;
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};
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/*
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* Since different PMICs of SC27xx series can have different interrupt
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* base address and irq number, we should save irq number and irq base
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* in the device data structure.
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*/
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static const struct sprd_pmic_data sc2731_data = {
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.irq_base = SPRD_SC2731_IRQ_BASE,
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.num_irqs = SPRD_SC2731_IRQ_NUMS,
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};
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static const struct mfd_cell sprd_pmic_devs[] = {
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{
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.name = "sc27xx-wdt",
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.of_compatible = "sprd,sc27xx-wdt",
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}, {
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.name = "sc27xx-rtc",
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.of_compatible = "sprd,sc27xx-rtc",
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}, {
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.name = "sc27xx-charger",
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.of_compatible = "sprd,sc27xx-charger",
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}, {
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.name = "sc27xx-chg-timer",
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.of_compatible = "sprd,sc27xx-chg-timer",
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}, {
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.name = "sc27xx-fast-chg",
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.of_compatible = "sprd,sc27xx-fast-chg",
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}, {
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.name = "sc27xx-chg-wdt",
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.of_compatible = "sprd,sc27xx-chg-wdt",
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}, {
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.name = "sc27xx-typec",
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.of_compatible = "sprd,sc27xx-typec",
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}, {
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.name = "sc27xx-flash",
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.of_compatible = "sprd,sc27xx-flash",
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}, {
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.name = "sc27xx-eic",
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.of_compatible = "sprd,sc27xx-eic",
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}, {
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.name = "sc27xx-efuse",
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.of_compatible = "sprd,sc27xx-efuse",
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}, {
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.name = "sc27xx-thermal",
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.of_compatible = "sprd,sc27xx-thermal",
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}, {
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.name = "sc27xx-adc",
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.of_compatible = "sprd,sc27xx-adc",
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}, {
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.name = "sc27xx-audio-codec",
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.of_compatible = "sprd,sc27xx-audio-codec",
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}, {
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.name = "sc27xx-regulator",
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.of_compatible = "sprd,sc27xx-regulator",
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}, {
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.name = "sc27xx-vibrator",
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.of_compatible = "sprd,sc27xx-vibrator",
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}, {
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.name = "sc27xx-keypad-led",
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.of_compatible = "sprd,sc27xx-keypad-led",
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}, {
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.name = "sc27xx-bltc",
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.of_compatible = "sprd,sc27xx-bltc",
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}, {
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.name = "sc27xx-fgu",
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.of_compatible = "sprd,sc27xx-fgu",
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}, {
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.name = "sc27xx-7sreset",
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.of_compatible = "sprd,sc27xx-7sreset",
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}, {
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.name = "sc27xx-poweroff",
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.of_compatible = "sprd,sc27xx-poweroff",
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}, {
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.name = "sc27xx-syscon",
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.of_compatible = "sprd,sc27xx-syscon",
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},
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};
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static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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return spi_write(spi, data, count);
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}
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static int sprd_pmic_spi_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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u32 rx_buf[2] = { 0 };
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int ret;
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/* Now we only support one PMIC register to read every time. */
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if (reg_size != sizeof(u32) || val_size != sizeof(u32))
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return -EINVAL;
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/* Copy address to read from into first element of SPI buffer. */
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memcpy(rx_buf, reg, sizeof(u32));
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ret = spi_read(spi, rx_buf, 1);
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if (ret < 0)
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return ret;
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memcpy(val, rx_buf, val_size);
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return 0;
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}
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static struct regmap_bus sprd_pmic_regmap = {
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.write = sprd_pmic_spi_write,
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.read = sprd_pmic_spi_read,
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.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
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.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
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};
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static const struct regmap_config sprd_pmic_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = 0xffff,
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};
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static int sprd_pmic_probe(struct spi_device *spi)
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{
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struct sprd_pmic *ddata;
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const struct sprd_pmic_data *pdata;
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int ret, i;
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pdata = of_device_get_match_data(&spi->dev);
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if (!pdata) {
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dev_err(&spi->dev, "No matching driver data found\n");
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return -EINVAL;
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}
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ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
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&spi->dev, &sprd_pmic_config);
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if (IS_ERR(ddata->regmap)) {
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ret = PTR_ERR(ddata->regmap);
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dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
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return ret;
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}
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spi_set_drvdata(spi, ddata);
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ddata->dev = &spi->dev;
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ddata->irq = spi->irq;
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ddata->irq_chip.name = dev_name(&spi->dev);
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ddata->irq_chip.status_base =
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pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
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ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
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ddata->irq_chip.ack_base = 0;
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ddata->irq_chip.num_regs = 1;
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ddata->irq_chip.num_irqs = pdata->num_irqs;
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ddata->irq_chip.mask_invert = true;
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ddata->irqs = devm_kcalloc(&spi->dev,
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pdata->num_irqs, sizeof(struct regmap_irq),
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GFP_KERNEL);
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if (!ddata->irqs)
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return -ENOMEM;
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ddata->irq_chip.irqs = ddata->irqs;
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for (i = 0; i < pdata->num_irqs; i++) {
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ddata->irqs[i].reg_offset = i / pdata->num_irqs;
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ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
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}
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ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
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IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
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&ddata->irq_chip, &ddata->irq_data);
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if (ret) {
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dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
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return ret;
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}
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ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO,
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sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs),
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NULL, 0,
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regmap_irq_get_domain(ddata->irq_data));
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if (ret) {
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dev_err(&spi->dev, "Failed to register device %d\n", ret);
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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 const struct of_device_id sprd_pmic_match[] = {
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{ .compatible = "sprd,sc2731", .data = &sc2731_data },
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{},
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};
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MODULE_DEVICE_TABLE(of, sprd_pmic_match);
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static struct spi_driver sprd_pmic_driver = {
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.driver = {
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.name = "sc27xx-pmic",
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.bus = &spi_bus_type,
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.of_match_table = sprd_pmic_match,
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},
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.probe = sprd_pmic_probe,
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};
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static int __init sprd_pmic_init(void)
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{
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return spi_register_driver(&sprd_pmic_driver);
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}
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subsys_initcall(sprd_pmic_init);
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static void __exit sprd_pmic_exit(void)
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{
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spi_unregister_driver(&sprd_pmic_driver);
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}
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module_exit(sprd_pmic_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
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MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
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