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linux-next/drivers/mfd/tps65217.c
Keerthy 511cb17448 mfd: tps65217: Introduce dependency on CONFIG_OF 
Currently the driver boots only via device tree hence add a
dependency on CONFIG_OF. This leaves with a bunch of unused code
so clean that up. This patch also makes use of probe_new function
in place of the probe function so as to avoid passing i2c_device_id.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-10-13 10:42:58 +01:00

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/*
* tps65217.c
*
* TPS65217 chip family multi-function driver
*
* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65217.h>
static struct resource charger_resources[] = {
DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
};
static struct resource pb_resources[] = {
DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
};
static void tps65217_irq_lock(struct irq_data *data)
{
struct tps65217 *tps = irq_data_get_irq_chip_data(data);
mutex_lock(&tps->irq_lock);
}
static void tps65217_irq_sync_unlock(struct irq_data *data)
{
struct tps65217 *tps = irq_data_get_irq_chip_data(data);
int ret;
ret = tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK,
tps->irq_mask, TPS65217_PROTECT_NONE);
if (ret != 0)
dev_err(tps->dev, "Failed to sync IRQ masks\n");
mutex_unlock(&tps->irq_lock);
}
static void tps65217_irq_enable(struct irq_data *data)
{
struct tps65217 *tps = irq_data_get_irq_chip_data(data);
u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
tps->irq_mask &= ~mask;
}
static void tps65217_irq_disable(struct irq_data *data)
{
struct tps65217 *tps = irq_data_get_irq_chip_data(data);
u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
tps->irq_mask |= mask;
}
static struct irq_chip tps65217_irq_chip = {
.name = "tps65217",
.irq_bus_lock = tps65217_irq_lock,
.irq_bus_sync_unlock = tps65217_irq_sync_unlock,
.irq_enable = tps65217_irq_enable,
.irq_disable = tps65217_irq_disable,
};
static struct mfd_cell tps65217s[] = {
{
.name = "tps65217-pmic",
.of_compatible = "ti,tps65217-pmic",
},
{
.name = "tps65217-bl",
.of_compatible = "ti,tps65217-bl",
},
{
.name = "tps65217-charger",
.num_resources = ARRAY_SIZE(charger_resources),
.resources = charger_resources,
.of_compatible = "ti,tps65217-charger",
},
{
.name = "tps65217-pwrbutton",
.num_resources = ARRAY_SIZE(pb_resources),
.resources = pb_resources,
.of_compatible = "ti,tps65217-pwrbutton",
},
};
static irqreturn_t tps65217_irq_thread(int irq, void *data)
{
struct tps65217 *tps = data;
unsigned int status;
bool handled = false;
int i;
int ret;
ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
if (ret < 0) {
dev_err(tps->dev, "Failed to read IRQ status: %d\n",
ret);
return IRQ_NONE;
}
for (i = 0; i < TPS65217_NUM_IRQ; i++) {
if (status & BIT(i)) {
handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
handled = true;
}
}
if (handled)
return IRQ_HANDLED;
return IRQ_NONE;
}
static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct tps65217 *tps = h->host_data;
irq_set_chip_data(virq, tps);
irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
irq_set_nested_thread(virq, 1);
irq_set_parent(virq, tps->irq);
irq_set_noprobe(virq);
return 0;
}
static const struct irq_domain_ops tps65217_irq_domain_ops = {
.map = tps65217_irq_map,
};
static int tps65217_irq_init(struct tps65217 *tps, int irq)
{
int ret;
mutex_init(&tps->irq_lock);
tps->irq = irq;
/* Mask all interrupt sources */
tps->irq_mask = TPS65217_INT_MASK;
tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK,
TPS65217_INT_MASK, TPS65217_PROTECT_NONE);
tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
if (!tps->irq_domain) {
dev_err(tps->dev, "Could not create IRQ domain\n");
return -ENOMEM;
}
ret = devm_request_threaded_irq(tps->dev, irq, NULL,
tps65217_irq_thread, IRQF_ONESHOT,
"tps65217-irq", tps);
if (ret) {
dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
irq, ret);
return ret;
}
enable_irq_wake(irq);
return 0;
}
/**
* tps65217_reg_read: Read a single tps65217 register.
*
* @tps: Device to read from.
* @reg: Register to read.
* @val: Contians the value
*/
int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
unsigned int *val)
{
return regmap_read(tps->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps65217_reg_read);
/**
* tps65217_reg_write: Write a single tps65217 register.
*
* @tps65217: Device to write to.
* @reg: Register to write to.
* @val: Value to write.
* @level: Password protected level
*/
int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
unsigned int val, unsigned int level)
{
int ret;
unsigned int xor_reg_val;
switch (level) {
case TPS65217_PROTECT_NONE:
return regmap_write(tps->regmap, reg, val);
case TPS65217_PROTECT_L1:
xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
return regmap_write(tps->regmap, reg, val);
case TPS65217_PROTECT_L2:
xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
ret = regmap_write(tps->regmap, reg, val);
if (ret < 0)
return ret;
ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
xor_reg_val);
if (ret < 0)
return ret;
return regmap_write(tps->regmap, reg, val);
default:
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(tps65217_reg_write);
/**
* tps65217_update_bits: Modify bits w.r.t mask, val and level.
*
* @tps65217: Device to write to.
* @reg: Register to read-write to.
* @mask: Mask.
* @val: Value to write.
* @level: Password protected level
*/
static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
int ret;
unsigned int data;
ret = tps65217_reg_read(tps, reg, &data);
if (ret) {
dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
return ret;
}
data &= ~mask;
data |= val & mask;
ret = tps65217_reg_write(tps, reg, data, level);
if (ret)
dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
return ret;
}
int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int val, unsigned int level)
{
return tps65217_update_bits(tps, reg, mask, val, level);
}
EXPORT_SYMBOL_GPL(tps65217_set_bits);
int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
unsigned int mask, unsigned int level)
{
return tps65217_update_bits(tps, reg, mask, 0, level);
}
EXPORT_SYMBOL_GPL(tps65217_clear_bits);
static bool tps65217_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case TPS65217_REG_INT:
return true;
default:
return false;
}
}
static const struct regmap_config tps65217_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPS65217_REG_MAX,
.volatile_reg = tps65217_volatile_reg,
};
static const struct of_device_id tps65217_of_match[] = {
{ .compatible = "ti,tps65217"},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, tps65217_of_match);
static int tps65217_probe(struct i2c_client *client)
{
struct tps65217 *tps;
unsigned int version;
bool status_off = false;
int ret;
status_off = of_property_read_bool(client->dev.of_node,
"ti,pmic-shutdown-controller");
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
i2c_set_clientdata(client, tps);
tps->dev = &client->dev;
tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
if (IS_ERR(tps->regmap)) {
ret = PTR_ERR(tps->regmap);
dev_err(tps->dev, "Failed to allocate register map: %d\n",
ret);
return ret;
}
if (client->irq) {
tps65217_irq_init(tps, client->irq);
} else {
int i;
/* Don't tell children about IRQ resources which won't fire */
for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
tps65217s[i].num_resources = 0;
}
ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
ARRAY_SIZE(tps65217s), NULL, 0,
tps->irq_domain);
if (ret < 0) {
dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
return ret;
}
ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
if (ret < 0) {
dev_err(tps->dev, "Failed to read revision register: %d\n",
ret);
return ret;
}
/* Set the PMIC to shutdown on PWR_EN toggle */
if (status_off) {
ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
TPS65217_PROTECT_NONE);
if (ret)
dev_warn(tps->dev, "unable to set the status OFF\n");
}
dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
version & TPS65217_CHIPID_REV_MASK);
return 0;
}
static int tps65217_remove(struct i2c_client *client)
{
struct tps65217 *tps = i2c_get_clientdata(client);
unsigned int virq;
int i;
for (i = 0; i < TPS65217_NUM_IRQ; i++) {
virq = irq_find_mapping(tps->irq_domain, i);
if (virq)
irq_dispose_mapping(virq);
}
irq_domain_remove(tps->irq_domain);
tps->irq_domain = NULL;
return 0;
}
static const struct i2c_device_id tps65217_id_table[] = {
{"tps65217", TPS65217},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
static struct i2c_driver tps65217_driver = {
.driver = {
.name = "tps65217",
.of_match_table = tps65217_of_match,
},
.id_table = tps65217_id_table,
.probe_new = tps65217_probe,
.remove = tps65217_remove,
};
static int __init tps65217_init(void)
{
return i2c_add_driver(&tps65217_driver);
}
subsys_initcall(tps65217_init);
static void __exit tps65217_exit(void)
{
i2c_del_driver(&tps65217_driver);
}
module_exit(tps65217_exit);
MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
MODULE_LICENSE("GPL v2");
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