mfd: Add ST Multi-Function eXpander (STMFX) core driver
STMicroelectronics Multi-Function eXpander (STMFX) is a slave controller using I2C for communication with the main MCU. Main features are: - 16 fast GPIOs individually configurable in input/output - 8 alternate GPIOs individually configurable in input/output when other STMFX functions are not used - Main MCU IDD measurement - Resistive touchscreen controller Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
这个提交包含在：
Amelie Delaunay
@@ -1907,6 +1907,19 @@ config MFD_STPMIC1
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To compile this driver as a module, choose M here: the
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module will be called stpmic1.
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config MFD_STMFX
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tristate "Support for STMicroelectronics Multi-Function eXpander (STMFX)"
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depends on I2C
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depends on OF || COMPILE_TEST
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select MFD_CORE
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select REGMAP_I2C
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help
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Support for the STMicroelectronics Multi-Function eXpander.
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This driver provides common support for accessing the device,
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additional drivers must be enabled in order to use the functionality
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of the device.
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menu "Multimedia Capabilities Port drivers"
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depends on ARCH_SA1100
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@@ -246,4 +246,4 @@ obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
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obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
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obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o
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obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
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obj-$(CONFIG_MFD_STMFX) += stmfx.o
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545
drivers/mfd/stmfx.c
普通文件
545
drivers/mfd/stmfx.c
普通文件
@@ -0,0 +1,545 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for STMicroelectronics Multi-Function eXpander (STMFX) core
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*
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* Copyright (C) 2019 STMicroelectronics
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* Author(s): Amelie Delaunay <amelie.delaunay@st.com>.
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*/
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#include <linux/bitfield.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/stmfx.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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static bool stmfx_reg_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case STMFX_REG_SYS_CTRL:
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case STMFX_REG_IRQ_SRC_EN:
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case STMFX_REG_IRQ_PENDING:
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case STMFX_REG_IRQ_GPI_PENDING1:
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case STMFX_REG_IRQ_GPI_PENDING2:
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case STMFX_REG_IRQ_GPI_PENDING3:
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case STMFX_REG_GPIO_STATE1:
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case STMFX_REG_GPIO_STATE2:
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case STMFX_REG_GPIO_STATE3:
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case STMFX_REG_IRQ_GPI_SRC1:
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case STMFX_REG_IRQ_GPI_SRC2:
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case STMFX_REG_IRQ_GPI_SRC3:
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case STMFX_REG_GPO_SET1:
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case STMFX_REG_GPO_SET2:
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case STMFX_REG_GPO_SET3:
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case STMFX_REG_GPO_CLR1:
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case STMFX_REG_GPO_CLR2:
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case STMFX_REG_GPO_CLR3:
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return true;
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default:
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return false;
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}
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}
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static bool stmfx_reg_writeable(struct device *dev, unsigned int reg)
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{
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return (reg >= STMFX_REG_SYS_CTRL);
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}
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static const struct regmap_config stmfx_regmap_config = {
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.reg_bits = 8,
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.reg_stride = 1,
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.val_bits = 8,
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.max_register = STMFX_REG_MAX,
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.volatile_reg = stmfx_reg_volatile,
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.writeable_reg = stmfx_reg_writeable,
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.cache_type = REGCACHE_RBTREE,
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};
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static const struct resource stmfx_pinctrl_resources[] = {
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_GPIO),
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};
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static const struct resource stmfx_idd_resources[] = {
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_IDD),
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_ERROR),
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};
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static const struct resource stmfx_ts_resources[] = {
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_DET),
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_NE),
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_TH),
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_FULL),
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DEFINE_RES_IRQ(STMFX_REG_IRQ_SRC_EN_TS_OVF),
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};
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static struct mfd_cell stmfx_cells[] = {
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{
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.of_compatible = "st,stmfx-0300-pinctrl",
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.name = "stmfx-pinctrl",
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.resources = stmfx_pinctrl_resources,
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.num_resources = ARRAY_SIZE(stmfx_pinctrl_resources),
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},
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{
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.of_compatible = "st,stmfx-0300-idd",
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.name = "stmfx-idd",
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.resources = stmfx_idd_resources,
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.num_resources = ARRAY_SIZE(stmfx_idd_resources),
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},
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{
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.of_compatible = "st,stmfx-0300-ts",
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.name = "stmfx-ts",
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.resources = stmfx_ts_resources,
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.num_resources = ARRAY_SIZE(stmfx_ts_resources),
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},
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};
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static u8 stmfx_func_to_mask(u32 func)
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{
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u8 mask = 0;
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if (func & STMFX_FUNC_GPIO)
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mask |= STMFX_REG_SYS_CTRL_GPIO_EN;
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if ((func & STMFX_FUNC_ALTGPIO_LOW) || (func & STMFX_FUNC_ALTGPIO_HIGH))
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mask |= STMFX_REG_SYS_CTRL_ALTGPIO_EN;
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if (func & STMFX_FUNC_TS)
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mask |= STMFX_REG_SYS_CTRL_TS_EN;
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if (func & STMFX_FUNC_IDD)
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mask |= STMFX_REG_SYS_CTRL_IDD_EN;
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return mask;
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}
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int stmfx_function_enable(struct stmfx *stmfx, u32 func)
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{
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u32 sys_ctrl;
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u8 mask;
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int ret;
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ret = regmap_read(stmfx->map, STMFX_REG_SYS_CTRL, &sys_ctrl);
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if (ret)
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return ret;
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/*
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* IDD and TS have priority in STMFX FW, so if IDD and TS are enabled,
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* ALTGPIO function is disabled by STMFX FW. If IDD or TS is enabled,
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* the number of aGPIO available decreases. To avoid GPIO management
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* disturbance, abort IDD or TS function enable in this case.
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*/
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if (((func & STMFX_FUNC_IDD) || (func & STMFX_FUNC_TS)) &&
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(sys_ctrl & STMFX_REG_SYS_CTRL_ALTGPIO_EN)) {
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dev_err(stmfx->dev, "ALTGPIO function already enabled\n");
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return -EBUSY;
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}
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/* If TS is enabled, aGPIO[3:0] cannot be used */
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if ((func & STMFX_FUNC_ALTGPIO_LOW) &&
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(sys_ctrl & STMFX_REG_SYS_CTRL_TS_EN)) {
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dev_err(stmfx->dev, "TS in use, aGPIO[3:0] unavailable\n");
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return -EBUSY;
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}
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/* If IDD is enabled, aGPIO[7:4] cannot be used */
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if ((func & STMFX_FUNC_ALTGPIO_HIGH) &&
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(sys_ctrl & STMFX_REG_SYS_CTRL_IDD_EN)) {
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dev_err(stmfx->dev, "IDD in use, aGPIO[7:4] unavailable\n");
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return -EBUSY;
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}
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mask = stmfx_func_to_mask(func);
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return regmap_update_bits(stmfx->map, STMFX_REG_SYS_CTRL, mask, mask);
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}
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EXPORT_SYMBOL_GPL(stmfx_function_enable);
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int stmfx_function_disable(struct stmfx *stmfx, u32 func)
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{
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u8 mask = stmfx_func_to_mask(func);
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return regmap_update_bits(stmfx->map, STMFX_REG_SYS_CTRL, mask, 0);
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}
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EXPORT_SYMBOL_GPL(stmfx_function_disable);
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static void stmfx_irq_bus_lock(struct irq_data *data)
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{
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struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
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mutex_lock(&stmfx->lock);
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}
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static void stmfx_irq_bus_sync_unlock(struct irq_data *data)
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{
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struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
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regmap_write(stmfx->map, STMFX_REG_IRQ_SRC_EN, stmfx->irq_src);
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mutex_unlock(&stmfx->lock);
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}
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static void stmfx_irq_mask(struct irq_data *data)
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{
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struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
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stmfx->irq_src &= ~BIT(data->hwirq % 8);
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}
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static void stmfx_irq_unmask(struct irq_data *data)
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{
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struct stmfx *stmfx = irq_data_get_irq_chip_data(data);
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stmfx->irq_src |= BIT(data->hwirq % 8);
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}
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static struct irq_chip stmfx_irq_chip = {
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.name = "stmfx-core",
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.irq_bus_lock = stmfx_irq_bus_lock,
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.irq_bus_sync_unlock = stmfx_irq_bus_sync_unlock,
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.irq_mask = stmfx_irq_mask,
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.irq_unmask = stmfx_irq_unmask,
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};
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static irqreturn_t stmfx_irq_handler(int irq, void *data)
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{
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struct stmfx *stmfx = data;
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unsigned long n, pending;
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u32 ack;
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int ret;
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ret = regmap_read(stmfx->map, STMFX_REG_IRQ_PENDING,
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(u32 *)&pending);
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if (ret)
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return IRQ_NONE;
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/*
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* There is no ACK for GPIO, MFX_REG_IRQ_PENDING_GPIO is a logical OR
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* of MFX_REG_IRQ_GPI _PENDING1/_PENDING2/_PENDING3
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*/
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ack = pending & ~BIT(STMFX_REG_IRQ_SRC_EN_GPIO);
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if (ack) {
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ret = regmap_write(stmfx->map, STMFX_REG_IRQ_ACK, ack);
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if (ret)
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return IRQ_NONE;
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}
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for_each_set_bit(n, &pending, STMFX_REG_IRQ_SRC_MAX)
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handle_nested_irq(irq_find_mapping(stmfx->irq_domain, n));
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return IRQ_HANDLED;
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}
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static int stmfx_irq_map(struct irq_domain *d, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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irq_set_chip_data(virq, d->host_data);
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irq_set_chip_and_handler(virq, &stmfx_irq_chip, handle_simple_irq);
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irq_set_nested_thread(virq, 1);
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irq_set_noprobe(virq);
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return 0;
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}
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static void stmfx_irq_unmap(struct irq_domain *d, unsigned int virq)
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{
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irq_set_chip_and_handler(virq, NULL, NULL);
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irq_set_chip_data(virq, NULL);
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}
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static const struct irq_domain_ops stmfx_irq_ops = {
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.map = stmfx_irq_map,
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.unmap = stmfx_irq_unmap,
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};
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static void stmfx_irq_exit(struct i2c_client *client)
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{
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struct stmfx *stmfx = i2c_get_clientdata(client);
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int hwirq;
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for (hwirq = 0; hwirq < STMFX_REG_IRQ_SRC_MAX; hwirq++)
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irq_dispose_mapping(irq_find_mapping(stmfx->irq_domain, hwirq));
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irq_domain_remove(stmfx->irq_domain);
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}
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static int stmfx_irq_init(struct i2c_client *client)
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{
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struct stmfx *stmfx = i2c_get_clientdata(client);
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u32 irqoutpin = 0, irqtrigger;
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int ret;
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stmfx->irq_domain = irq_domain_add_simple(stmfx->dev->of_node,
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STMFX_REG_IRQ_SRC_MAX, 0,
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&stmfx_irq_ops, stmfx);
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if (!stmfx->irq_domain) {
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dev_err(stmfx->dev, "Failed to create IRQ domain\n");
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return -EINVAL;
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}
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if (!of_property_read_bool(stmfx->dev->of_node, "drive-open-drain"))
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irqoutpin |= STMFX_REG_IRQ_OUT_PIN_TYPE;
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irqtrigger = irq_get_trigger_type(client->irq);
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if ((irqtrigger & IRQ_TYPE_EDGE_RISING) ||
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(irqtrigger & IRQ_TYPE_LEVEL_HIGH))
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irqoutpin |= STMFX_REG_IRQ_OUT_PIN_POL;
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ret = regmap_write(stmfx->map, STMFX_REG_IRQ_OUT_PIN, irqoutpin);
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if (ret)
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return ret;
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ret = devm_request_threaded_irq(stmfx->dev, client->irq,
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NULL, stmfx_irq_handler,
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irqtrigger | IRQF_ONESHOT,
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"stmfx", stmfx);
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if (ret)
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stmfx_irq_exit(client);
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return ret;
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}
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static int stmfx_chip_reset(struct stmfx *stmfx)
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{
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int ret;
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ret = regmap_write(stmfx->map, STMFX_REG_SYS_CTRL,
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STMFX_REG_SYS_CTRL_SWRST);
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if (ret)
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return ret;
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msleep(STMFX_BOOT_TIME_MS);
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return ret;
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}
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static int stmfx_chip_init(struct i2c_client *client)
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{
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struct stmfx *stmfx = i2c_get_clientdata(client);
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u32 id;
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u8 version[2];
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int ret;
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stmfx->vdd = devm_regulator_get_optional(&client->dev, "vdd");
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ret = PTR_ERR_OR_ZERO(stmfx->vdd);
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if (ret == -ENODEV) {
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stmfx->vdd = NULL;
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} else if (ret == -EPROBE_DEFER) {
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return ret;
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} else if (ret) {
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dev_err(&client->dev, "Failed to get VDD regulator: %d\n", ret);
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return ret;
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}
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if (stmfx->vdd) {
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ret = regulator_enable(stmfx->vdd);
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if (ret) {
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dev_err(&client->dev, "VDD enable failed: %d\n", ret);
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return ret;
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}
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}
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ret = regmap_read(stmfx->map, STMFX_REG_CHIP_ID, &id);
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if (ret) {
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dev_err(&client->dev, "Error reading chip ID: %d\n", ret);
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goto err;
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}
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/*
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* Check that ID is the complement of the I2C address:
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* STMFX I2C address follows the 7-bit format (MSB), that's why
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* client->addr is shifted.
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*
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* STMFX_I2C_ADDR| STMFX | Linux
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* input pin | I2C device address | I2C device address
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*---------------------------------------------------------
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* 0 | b: 1000 010x h:0x84 | 0x42
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* 1 | b: 1000 011x h:0x86 | 0x43
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*/
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if (FIELD_GET(STMFX_REG_CHIP_ID_MASK, ~id) != (client->addr << 1)) {
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dev_err(&client->dev, "Unknown chip ID: %#x\n", id);
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ret = -EINVAL;
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goto err;
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}
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ret = regmap_bulk_read(stmfx->map, STMFX_REG_FW_VERSION_MSB,
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version, ARRAY_SIZE(version));
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if (ret) {
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dev_err(&client->dev, "Error reading FW version: %d\n", ret);
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goto err;
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}
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dev_info(&client->dev, "STMFX id: %#x, fw version: %x.%02x\n",
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id, version[0], version[1]);
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ret = stmfx_chip_reset(stmfx);
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if (ret) {
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dev_err(&client->dev, "Failed to reset chip: %d\n", ret);
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goto err;
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}
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return 0;
|
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err:
|
||||
if (stmfx->vdd)
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return regulator_disable(stmfx->vdd);
|
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|
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return ret;
|
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}
|
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|
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static int stmfx_chip_exit(struct i2c_client *client)
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{
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struct stmfx *stmfx = i2c_get_clientdata(client);
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regmap_write(stmfx->map, STMFX_REG_IRQ_SRC_EN, 0);
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regmap_write(stmfx->map, STMFX_REG_SYS_CTRL, 0);
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if (stmfx->vdd)
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return regulator_disable(stmfx->vdd);
|
||||
|
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return 0;
|
||||
}
|
||||
|
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static int stmfx_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
struct stmfx *stmfx;
|
||||
int ret;
|
||||
|
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stmfx = devm_kzalloc(dev, sizeof(*stmfx), GFP_KERNEL);
|
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if (!stmfx)
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||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, stmfx);
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||||
|
||||
stmfx->dev = dev;
|
||||
|
||||
stmfx->map = devm_regmap_init_i2c(client, &stmfx_regmap_config);
|
||||
if (IS_ERR(stmfx->map)) {
|
||||
ret = PTR_ERR(stmfx->map);
|
||||
dev_err(dev, "Failed to allocate register map: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_init(&stmfx->lock);
|
||||
|
||||
ret = stmfx_chip_init(client);
|
||||
if (ret) {
|
||||
if (ret == -ETIMEDOUT)
|
||||
return -EPROBE_DEFER;
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (client->irq < 0) {
|
||||
dev_err(dev, "Failed to get IRQ: %d\n", client->irq);
|
||||
ret = client->irq;
|
||||
goto err_chip_exit;
|
||||
}
|
||||
|
||||
ret = stmfx_irq_init(client);
|
||||
if (ret)
|
||||
goto err_chip_exit;
|
||||
|
||||
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
|
||||
stmfx_cells, ARRAY_SIZE(stmfx_cells), NULL,
|
||||
0, stmfx->irq_domain);
|
||||
if (ret)
|
||||
goto err_irq_exit;
|
||||
|
||||
return 0;
|
||||
|
||||
err_irq_exit:
|
||||
stmfx_irq_exit(client);
|
||||
err_chip_exit:
|
||||
stmfx_chip_exit(client);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int stmfx_remove(struct i2c_client *client)
|
||||
{
|
||||
stmfx_irq_exit(client);
|
||||
|
||||
return stmfx_chip_exit(client);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int stmfx_suspend(struct device *dev)
|
||||
{
|
||||
struct stmfx *stmfx = dev_get_drvdata(dev);
|
||||
int ret;
|
||||
|
||||
ret = regmap_raw_read(stmfx->map, STMFX_REG_SYS_CTRL,
|
||||
&stmfx->bkp_sysctrl, sizeof(stmfx->bkp_sysctrl));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_raw_read(stmfx->map, STMFX_REG_IRQ_OUT_PIN,
|
||||
&stmfx->bkp_irqoutpin,
|
||||
sizeof(stmfx->bkp_irqoutpin));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (stmfx->vdd)
|
||||
return regulator_disable(stmfx->vdd);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int stmfx_resume(struct device *dev)
|
||||
{
|
||||
struct stmfx *stmfx = dev_get_drvdata(dev);
|
||||
int ret;
|
||||
|
||||
if (stmfx->vdd) {
|
||||
ret = regulator_enable(stmfx->vdd);
|
||||
if (ret) {
|
||||
dev_err(stmfx->dev,
|
||||
"VDD enable failed: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
ret = regmap_raw_write(stmfx->map, STMFX_REG_SYS_CTRL,
|
||||
&stmfx->bkp_sysctrl, sizeof(stmfx->bkp_sysctrl));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_raw_write(stmfx->map, STMFX_REG_IRQ_OUT_PIN,
|
||||
&stmfx->bkp_irqoutpin,
|
||||
sizeof(stmfx->bkp_irqoutpin));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regmap_raw_write(stmfx->map, STMFX_REG_IRQ_SRC_EN,
|
||||
&stmfx->irq_src, sizeof(stmfx->irq_src));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(stmfx_dev_pm_ops, stmfx_suspend, stmfx_resume);
|
||||
|
||||
static const struct of_device_id stmfx_of_match[] = {
|
||||
{ .compatible = "st,stmfx-0300", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, stmfx_of_match);
|
||||
|
||||
static struct i2c_driver stmfx_driver = {
|
||||
.driver = {
|
||||
.name = "stmfx-core",
|
||||
.of_match_table = of_match_ptr(stmfx_of_match),
|
||||
.pm = &stmfx_dev_pm_ops,
|
||||
},
|
||||
.probe = stmfx_probe,
|
||||
.remove = stmfx_remove,
|
||||
};
|
||||
module_i2c_driver(stmfx_driver);
|
||||
|
||||
MODULE_DESCRIPTION("STMFX core driver");
|
||||
MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
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