508 lines
12 KiB
C
508 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tc3589x.h>
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#include <linux/err.h>
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/*
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* enum tc3589x_version - indicates the TC3589x version
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*/
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enum tc3589x_version {
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TC3589X_TC35890,
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TC3589X_TC35892,
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TC3589X_TC35893,
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TC3589X_TC35894,
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TC3589X_TC35895,
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TC3589X_TC35896,
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TC3589X_UNKNOWN,
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};
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#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
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#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
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/**
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* tc3589x_reg_read() - read a single TC3589x register
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* @tc3589x: Device to read from
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* @reg: Register to read
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*/
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int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_reg_read);
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/**
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* tc3589x_reg_write() - write a single TC3589x register
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* @tc3589x: Device to write to
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* @reg: Register to read
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* @data: Value to write
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*/
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int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_reg_write);
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/**
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* tc3589x_block_read() - read multiple TC3589x registers
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* @tc3589x: Device to read from
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* @reg: First register
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* @length: Number of registers
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* @values: Buffer to write to
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*/
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int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
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{
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int ret;
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ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_block_read);
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/**
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* tc3589x_block_write() - write multiple TC3589x registers
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* @tc3589x: Device to write to
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* @reg: First register
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* @length: Number of registers
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* @values: Values to write
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*/
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int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
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const u8 *values)
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{
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int ret;
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ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
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values);
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if (ret < 0)
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dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
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reg, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_block_write);
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/**
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* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
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* @tc3589x: Device to write to
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* @reg: Register to write
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* @mask: Mask of bits to set
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* @val: Value to set
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*/
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int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
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{
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int ret;
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mutex_lock(&tc3589x->lock);
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ret = tc3589x_reg_read(tc3589x, reg);
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if (ret < 0)
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goto out;
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ret &= ~mask;
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ret |= val;
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ret = tc3589x_reg_write(tc3589x, reg, ret);
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out:
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mutex_unlock(&tc3589x->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tc3589x_set_bits);
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static const struct resource gpio_resources[] = {
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{
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.start = TC3589x_INT_GPIIRQ,
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.end = TC3589x_INT_GPIIRQ,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct resource keypad_resources[] = {
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{
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.start = TC3589x_INT_KBDIRQ,
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.end = TC3589x_INT_KBDIRQ,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct mfd_cell tc3589x_dev_gpio[] = {
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{
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.name = "tc3589x-gpio",
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.num_resources = ARRAY_SIZE(gpio_resources),
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.resources = &gpio_resources[0],
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.of_compatible = "toshiba,tc3589x-gpio",
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},
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};
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static const struct mfd_cell tc3589x_dev_keypad[] = {
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{
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.name = "tc3589x-keypad",
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.num_resources = ARRAY_SIZE(keypad_resources),
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.resources = &keypad_resources[0],
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.of_compatible = "toshiba,tc3589x-keypad",
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},
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};
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static irqreturn_t tc3589x_irq(int irq, void *data)
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{
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struct tc3589x *tc3589x = data;
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int status;
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again:
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status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
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if (status < 0)
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return IRQ_NONE;
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while (status) {
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int bit = __ffs(status);
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int virq = irq_find_mapping(tc3589x->domain, bit);
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handle_nested_irq(virq);
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status &= ~(1 << bit);
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}
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/*
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* A dummy read or write (to any register) appears to be necessary to
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* have the last interrupt clear (for example, GPIO IC write) take
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* effect. In such a case, recheck for any interrupt which is still
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* pending.
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*/
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status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
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if (status)
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goto again;
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return IRQ_HANDLED;
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}
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static int tc3589x_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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struct tc3589x *tc3589x = d->host_data;
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irq_set_chip_data(virq, tc3589x);
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irq_set_chip_and_handler(virq, &dummy_irq_chip,
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handle_edge_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 tc3589x_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 tc3589x_irq_ops = {
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.map = tc3589x_irq_map,
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.unmap = tc3589x_irq_unmap,
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.xlate = irq_domain_xlate_onecell,
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};
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static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
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{
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tc3589x->domain = irq_domain_add_simple(
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np, TC3589x_NR_INTERNAL_IRQS, 0,
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&tc3589x_irq_ops, tc3589x);
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if (!tc3589x->domain) {
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dev_err(tc3589x->dev, "Failed to create irqdomain\n");
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return -ENOSYS;
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}
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return 0;
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}
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static int tc3589x_chip_init(struct tc3589x *tc3589x)
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{
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int manf, ver, ret;
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manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
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if (manf < 0)
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return manf;
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ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
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if (ver < 0)
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return ver;
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if (manf != TC3589x_MANFCODE_MAGIC) {
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dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
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return -EINVAL;
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}
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dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
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/*
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* Put everything except the IRQ module into reset;
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* also spare the GPIO module for any pin initialization
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* done during pre-kernel boot
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*/
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ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
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TC3589x_RSTCTRL_TIMRST
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| TC3589x_RSTCTRL_ROTRST
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| TC3589x_RSTCTRL_KBDRST);
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if (ret < 0)
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return ret;
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/* Clear the reset interrupt. */
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return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
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}
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static int tc3589x_device_init(struct tc3589x *tc3589x)
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{
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int ret = 0;
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unsigned int blocks = tc3589x->pdata->block;
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if (blocks & TC3589x_BLOCK_GPIO) {
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ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
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ARRAY_SIZE(tc3589x_dev_gpio), NULL,
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0, tc3589x->domain);
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if (ret) {
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dev_err(tc3589x->dev, "failed to add gpio child\n");
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return ret;
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}
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dev_info(tc3589x->dev, "added gpio block\n");
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}
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if (blocks & TC3589x_BLOCK_KEYPAD) {
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ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
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ARRAY_SIZE(tc3589x_dev_keypad), NULL,
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0, tc3589x->domain);
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if (ret) {
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dev_err(tc3589x->dev, "failed to keypad child\n");
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return ret;
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}
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dev_info(tc3589x->dev, "added keypad block\n");
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}
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return ret;
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}
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static const struct of_device_id tc3589x_match[] = {
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/* Legacy compatible string */
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{ .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
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{ .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
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{ .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
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{ .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
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{ .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
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{ .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
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{ .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tc3589x_match);
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static struct tc3589x_platform_data *
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tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
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{
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struct device_node *np = dev->of_node;
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struct tc3589x_platform_data *pdata;
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struct device_node *child;
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const struct of_device_id *of_id;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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of_id = of_match_device(tc3589x_match, dev);
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if (!of_id)
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return ERR_PTR(-ENODEV);
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*version = (enum tc3589x_version) of_id->data;
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for_each_child_of_node(np, child) {
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if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
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pdata->block |= TC3589x_BLOCK_GPIO;
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if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
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pdata->block |= TC3589x_BLOCK_KEYPAD;
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}
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return pdata;
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}
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static int tc3589x_probe(struct i2c_client *i2c)
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{
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const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
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struct device_node *np = i2c->dev.of_node;
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struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
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struct tc3589x *tc3589x;
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enum tc3589x_version version;
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int ret;
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if (!pdata) {
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pdata = tc3589x_of_probe(&i2c->dev, &version);
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if (IS_ERR(pdata)) {
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dev_err(&i2c->dev, "No platform data or DT found\n");
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return PTR_ERR(pdata);
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}
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} else {
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/* When not probing from device tree we have this ID */
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version = id->driver_data;
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}
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if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_I2C_BLOCK))
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return -EIO;
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tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
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GFP_KERNEL);
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if (!tc3589x)
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return -ENOMEM;
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mutex_init(&tc3589x->lock);
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tc3589x->dev = &i2c->dev;
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tc3589x->i2c = i2c;
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tc3589x->pdata = pdata;
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switch (version) {
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case TC3589X_TC35893:
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case TC3589X_TC35895:
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case TC3589X_TC35896:
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tc3589x->num_gpio = 20;
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break;
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case TC3589X_TC35890:
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case TC3589X_TC35892:
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case TC3589X_TC35894:
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case TC3589X_UNKNOWN:
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default:
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tc3589x->num_gpio = 24;
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break;
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}
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i2c_set_clientdata(i2c, tc3589x);
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ret = tc3589x_chip_init(tc3589x);
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if (ret)
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return ret;
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ret = tc3589x_irq_init(tc3589x, np);
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if (ret)
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return ret;
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ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"tc3589x", tc3589x);
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if (ret) {
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dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
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return ret;
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}
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ret = tc3589x_device_init(tc3589x);
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if (ret) {
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dev_err(tc3589x->dev, "failed to add child devices\n");
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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 void tc3589x_remove(struct i2c_client *client)
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{
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struct tc3589x *tc3589x = i2c_get_clientdata(client);
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mfd_remove_devices(tc3589x->dev);
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}
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static int tc3589x_suspend(struct device *dev)
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{
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struct tc3589x *tc3589x = dev_get_drvdata(dev);
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struct i2c_client *client = tc3589x->i2c;
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int ret = 0;
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/* put the system to sleep mode */
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if (!device_may_wakeup(&client->dev))
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ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
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TC3589x_CLKMODE_MODCTL_SLEEP);
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return ret;
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}
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static int tc3589x_resume(struct device *dev)
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{
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struct tc3589x *tc3589x = dev_get_drvdata(dev);
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struct i2c_client *client = tc3589x->i2c;
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int ret = 0;
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/* enable the system into operation */
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if (!device_may_wakeup(&client->dev))
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ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
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TC3589x_CLKMODE_MODCTL_OPERATION);
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return ret;
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops,
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tc3589x_suspend, tc3589x_resume);
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static const struct i2c_device_id tc3589x_id[] = {
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{ "tc35890", TC3589X_TC35890 },
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{ "tc35892", TC3589X_TC35892 },
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{ "tc35893", TC3589X_TC35893 },
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{ "tc35894", TC3589X_TC35894 },
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{ "tc35895", TC3589X_TC35895 },
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{ "tc35896", TC3589X_TC35896 },
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{ "tc3589x", TC3589X_UNKNOWN },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tc3589x_id);
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static struct i2c_driver tc3589x_driver = {
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.driver = {
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.name = "tc3589x",
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.pm = pm_sleep_ptr(&tc3589x_dev_pm_ops),
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.of_match_table = of_match_ptr(tc3589x_match),
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},
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.probe_new = tc3589x_probe,
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|
.remove = tc3589x_remove,
|
|
.id_table = tc3589x_id,
|
|
};
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|
|
|
static int __init tc3589x_init(void)
|
|
{
|
|
return i2c_add_driver(&tc3589x_driver);
|
|
}
|
|
subsys_initcall(tc3589x_init);
|
|
|
|
static void __exit tc3589x_exit(void)
|
|
{
|
|
i2c_del_driver(&tc3589x_driver);
|
|
}
|
|
module_exit(tc3589x_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
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|
MODULE_DESCRIPTION("TC3589x MFD core driver");
|
|
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
|