376 lines
9.1 KiB
C
376 lines
9.1 KiB
C
/*
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* Core driver for TI TPS65090 PMIC family
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65090.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#define NUM_INT_REG 2
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#define TOTAL_NUM_REG 0x18
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/* interrupt status registers */
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#define TPS65090_INT_STS 0x0
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#define TPS65090_INT_STS2 0x1
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/* interrupt mask registers */
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#define TPS65090_INT_MSK 0x2
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#define TPS65090_INT_MSK2 0x3
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struct tps65090_irq_data {
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u8 mask_reg;
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u8 mask_pos;
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};
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#define TPS65090_IRQ(_reg, _mask_pos) \
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{ \
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.mask_reg = (_reg), \
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.mask_pos = (_mask_pos), \
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}
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static const struct tps65090_irq_data tps65090_irqs[] = {
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[0] = TPS65090_IRQ(0, 0),
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[1] = TPS65090_IRQ(0, 1),
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[2] = TPS65090_IRQ(0, 2),
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[3] = TPS65090_IRQ(0, 3),
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[4] = TPS65090_IRQ(0, 4),
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[5] = TPS65090_IRQ(0, 5),
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[6] = TPS65090_IRQ(0, 6),
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[7] = TPS65090_IRQ(0, 7),
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[8] = TPS65090_IRQ(1, 0),
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[9] = TPS65090_IRQ(1, 1),
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[10] = TPS65090_IRQ(1, 2),
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[11] = TPS65090_IRQ(1, 3),
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[12] = TPS65090_IRQ(1, 4),
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[13] = TPS65090_IRQ(1, 5),
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[14] = TPS65090_IRQ(1, 6),
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[15] = TPS65090_IRQ(1, 7),
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};
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static struct mfd_cell tps65090s[] = {
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{
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.name = "tps65090-pmic",
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},
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{
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.name = "tps65090-regulator",
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},
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};
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int tps65090_write(struct device *dev, int reg, uint8_t val)
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{
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struct tps65090 *tps = dev_get_drvdata(dev);
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return regmap_write(tps->rmap, reg, val);
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}
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EXPORT_SYMBOL_GPL(tps65090_write);
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int tps65090_read(struct device *dev, int reg, uint8_t *val)
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{
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struct tps65090 *tps = dev_get_drvdata(dev);
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unsigned int temp_val;
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int ret;
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ret = regmap_read(tps->rmap, reg, &temp_val);
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if (!ret)
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*val = temp_val;
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return ret;
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}
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EXPORT_SYMBOL_GPL(tps65090_read);
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int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
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{
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struct tps65090 *tps = dev_get_drvdata(dev);
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return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u);
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}
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EXPORT_SYMBOL_GPL(tps65090_set_bits);
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int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
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{
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struct tps65090 *tps = dev_get_drvdata(dev);
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return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u);
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}
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EXPORT_SYMBOL_GPL(tps65090_clr_bits);
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static void tps65090_irq_lock(struct irq_data *data)
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{
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struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
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mutex_lock(&tps65090->irq_lock);
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}
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static void tps65090_irq_mask(struct irq_data *irq_data)
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{
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struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
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unsigned int __irq = irq_data->hwirq;
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const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
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tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
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data->mask_pos);
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}
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static void tps65090_irq_unmask(struct irq_data *irq_data)
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{
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struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
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unsigned int __irq = irq_data->irq - tps65090->irq_base;
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const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
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tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
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data->mask_pos);
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}
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static void tps65090_irq_sync_unlock(struct irq_data *data)
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{
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struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
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mutex_unlock(&tps65090->irq_lock);
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}
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static irqreturn_t tps65090_irq(int irq, void *data)
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{
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struct tps65090 *tps65090 = data;
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int ret = 0;
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u8 status, mask;
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unsigned long int acks = 0;
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int i;
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for (i = 0; i < NUM_INT_REG; i++) {
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ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
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if (ret < 0) {
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dev_err(tps65090->dev,
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"failed to read mask reg [addr:%d]\n",
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TPS65090_INT_MSK + i);
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return IRQ_NONE;
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}
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ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
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&status);
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if (ret < 0) {
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dev_err(tps65090->dev,
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"failed to read status reg [addr:%d]\n",
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TPS65090_INT_STS + i);
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return IRQ_NONE;
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}
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if (status) {
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/* Ack only those interrupts which are not masked */
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status &= (~mask);
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ret = tps65090_write(tps65090->dev,
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TPS65090_INT_STS + i, status);
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if (ret < 0) {
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dev_err(tps65090->dev,
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"failed to write interrupt status\n");
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return IRQ_NONE;
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}
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acks |= (status << (i * 8));
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}
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}
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for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
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handle_nested_irq(tps65090->irq_base + i);
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return acks ? IRQ_HANDLED : IRQ_NONE;
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}
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static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
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int irq_base)
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{
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int i, ret;
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if (!irq_base) {
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dev_err(tps65090->dev, "IRQ base not set\n");
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return -EINVAL;
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}
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mutex_init(&tps65090->irq_lock);
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for (i = 0; i < NUM_INT_REG; i++)
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tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);
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for (i = 0; i < NUM_INT_REG; i++)
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tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);
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tps65090->irq_base = irq_base;
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tps65090->irq_chip.name = "tps65090";
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tps65090->irq_chip.irq_mask = tps65090_irq_mask;
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tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
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tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
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tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;
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for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
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int __irq = i + tps65090->irq_base;
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irq_set_chip_data(__irq, tps65090);
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irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
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handle_simple_irq);
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irq_set_nested_thread(__irq, 1);
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#ifdef CONFIG_ARM
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set_irq_flags(__irq, IRQF_VALID);
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#endif
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}
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ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
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"tps65090", tps65090);
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if (!ret) {
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device_init_wakeup(tps65090->dev, 1);
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enable_irq_wake(irq);
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}
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return ret;
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}
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static bool is_volatile_reg(struct device *dev, unsigned int reg)
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{
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if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS))
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return true;
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else
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return false;
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}
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static const struct regmap_config tps65090_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = TOTAL_NUM_REG,
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.num_reg_defaults_raw = TOTAL_NUM_REG,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = is_volatile_reg,
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};
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static int __devinit tps65090_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tps65090_platform_data *pdata = client->dev.platform_data;
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struct tps65090 *tps65090;
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int ret;
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if (!pdata) {
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dev_err(&client->dev, "tps65090 requires platform data\n");
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return -EINVAL;
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}
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tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
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GFP_KERNEL);
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if (tps65090 == NULL)
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return -ENOMEM;
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tps65090->client = client;
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tps65090->dev = &client->dev;
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i2c_set_clientdata(client, tps65090);
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mutex_init(&tps65090->lock);
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if (client->irq) {
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ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
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if (ret) {
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dev_err(&client->dev, "IRQ init failed with err: %d\n",
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ret);
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goto err_exit;
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}
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}
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tps65090->rmap = devm_regmap_init_i2c(tps65090->client,
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&tps65090_regmap_config);
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if (IS_ERR(tps65090->rmap)) {
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ret = PTR_ERR(tps65090->rmap);
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dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
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goto err_irq_exit;
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}
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ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
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ARRAY_SIZE(tps65090s), NULL, 0, NULL);
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if (ret) {
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dev_err(&client->dev, "add mfd devices failed with err: %d\n",
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ret);
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goto err_irq_exit;
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}
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return 0;
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err_irq_exit:
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if (client->irq)
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free_irq(client->irq, tps65090);
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err_exit:
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return ret;
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}
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static int __devexit tps65090_i2c_remove(struct i2c_client *client)
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{
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struct tps65090 *tps65090 = i2c_get_clientdata(client);
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mfd_remove_devices(tps65090->dev);
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if (client->irq)
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free_irq(client->irq, tps65090);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int tps65090_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (client->irq)
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disable_irq(client->irq);
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return 0;
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}
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static int tps65090_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (client->irq)
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enable_irq(client->irq);
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return 0;
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}
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#endif
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static const struct dev_pm_ops tps65090_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
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};
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static const struct i2c_device_id tps65090_id_table[] = {
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{ "tps65090", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
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static struct i2c_driver tps65090_driver = {
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.driver = {
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.name = "tps65090",
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.owner = THIS_MODULE,
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.pm = &tps65090_pm_ops,
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},
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.probe = tps65090_i2c_probe,
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.remove = __devexit_p(tps65090_i2c_remove),
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.id_table = tps65090_id_table,
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};
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static int __init tps65090_init(void)
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{
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return i2c_add_driver(&tps65090_driver);
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}
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subsys_initcall(tps65090_init);
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static void __exit tps65090_exit(void)
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{
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i2c_del_driver(&tps65090_driver);
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}
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module_exit(tps65090_exit);
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MODULE_DESCRIPTION("TPS65090 core driver");
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MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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