Commit c36b1b2d authored by Christophe Ricard's avatar Christophe Ricard Committed by Peter Huewe

tpm/tpm_i2c_stm_st33: Add devicetree structure

Add tpm_stm_st33_i2c dts structure keeping backward compatibility
with static platform_data support as well.
In the mean time to easy this update and to make it much simpler, we:
- Moved all gpio_request to devm_gpio_request_one primitive
- Moved request_irq to devm_request_irq
Reviewed-by: default avatarJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: default avatarChristophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: default avatarPeter Huewe <peterhuewe@gmx.de>
parent 875edad5
......@@ -46,6 +46,8 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/tpm_i2c_stm_st33.h>
#include "tpm.h"
......@@ -606,13 +608,81 @@ static const struct tpm_class_ops st_i2c_tpm = {
.req_canceled = tpm_stm_i2c_req_canceled,
};
static int interrupts;
module_param(interrupts, int, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
#ifdef CONFIG_OF
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
{
struct device_node *pp;
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
struct i2c_client *client = tpm_dev->client;
int gpio;
int ret;
static int power_mgt = 1;
module_param(power_mgt, int, 0444);
MODULE_PARM_DESC(power_mgt, "Power Management");
pp = client->dev.of_node;
if (!pp) {
dev_err(chip->dev, "No platform data\n");
return -ENODEV;
}
/* Get GPIO from device tree */
gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
if (gpio < 0) {
dev_err(chip->dev, "Failed to retrieve lpcpd-gpios from dts.\n");
tpm_dev->io_lpcpd = -1;
/*
* lpcpd pin is not specified. This is not an issue as
* power management can be also managed by TPM specific
* commands. So leave with a success status code.
*/
return 0;
}
/* GPIO request and configuration */
ret = devm_gpio_request_one(&client->dev, gpio,
GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
if (ret) {
dev_err(chip->dev, "Failed to request lpcpd pin\n");
return -ENODEV;
}
tpm_dev->io_lpcpd = gpio;
return 0;
}
#else
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
{
return -ENODEV;
}
#endif
static int tpm_stm_i2c_request_resources(struct i2c_client *client,
struct tpm_chip *chip)
{
struct st33zp24_platform_data *pdata;
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
int ret;
pdata = client->dev.platform_data;
if (pdata == NULL) {
pr_err("No platform data\n");
return -EINVAL;
}
/* store for late use */
tpm_dev->io_lpcpd = pdata->io_lpcpd;
if (gpio_is_valid(pdata->io_lpcpd)) {
ret = devm_gpio_request_one(&client->dev,
pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
"TPM IO_LPCPD");
if (ret) {
dev_err(chip->dev, "%s : reset gpio_request failed\n",
__FILE__);
return ret;
}
}
return 0;
}
/*
* tpm_stm_i2c_probe initialize the TPM device
......@@ -633,30 +703,18 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (client == NULL) {
pr_info("%s: i2c client is NULL. Device not accessible.\n",
__func__);
ret = -ENODEV;
goto end;
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_info(&client->dev, "client not i2c capable\n");
ret = -ENODEV;
goto end;
return -ENODEV;
}
tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
GFP_KERNEL);
if (!tpm_dev) {
ret = -ENOMEM;
goto _tpm_clean_answer;
}
platform_data = client->dev.platform_data;
if (!platform_data) {
dev_info(&client->dev, "chip not available\n");
ret = -ENODEV;
goto _tpm_clean_answer;
}
if (!tpm_dev)
return -ENOMEM;
chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
if (!chip) {
......@@ -667,6 +725,17 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
TPM_VPRIV(chip) = tpm_dev;
tpm_dev->client = client;
platform_data = client->dev.platform_data;
if (!platform_data && client->dev.of_node) {
ret = tpm_stm_i2c_of_request_resources(chip);
if (ret)
goto _tpm_clean_answer;
} else if (platform_data) {
ret = tpm_stm_i2c_request_resources(client, chip);
if (ret)
goto _tpm_clean_answer;
}
chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
......@@ -674,14 +743,7 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
chip->vendor.locality = LOCALITY0;
if (power_mgt) {
ret = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
if (ret)
goto _gpio_init1;
gpio_set_value(platform_data->io_lpcpd, 1);
}
if (interrupts) {
if (client->irq) {
init_completion(&tpm_dev->irq_detection);
if (request_locality(chip) != LOCALITY0) {
ret = -ENODEV;
......@@ -689,19 +751,19 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
}
clear_interruption(tpm_dev);
ret = request_irq(client->irq,
&tpm_ioserirq_handler,
ret = devm_request_irq(&client->dev, client->irq,
tpm_ioserirq_handler,
IRQF_TRIGGER_HIGH,
"TPM SERIRQ management", chip);
if (ret < 0) {
dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
client->irq);
goto _irq_set;
goto _tpm_clean_answer;
}
ret = I2C_READ_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
if (ret < 0)
goto _irq_set;
goto _tpm_clean_answer;
intmask |= TPM_INTF_CMD_READY_INT
| TPM_INTF_FIFO_AVALAIBLE_INT
......@@ -712,19 +774,19 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
ret = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
if (ret < 0)
goto _irq_set;
goto _tpm_clean_answer;
intmask = TPM_GLOBAL_INT_ENABLE;
ret = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3),
&intmask, 1);
if (ret < 0)
goto _irq_set;
goto _tpm_clean_answer;
ret = I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &intmask, 1);
if (ret < 0)
goto _irq_set;
goto _tpm_clean_answer;
chip->vendor.irq = interrupts;
chip->vendor.irq = client->irq;
tpm_gen_interrupt(chip);
}
......@@ -734,15 +796,9 @@ tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
dev_info(chip->dev, "TPM I2C Initialized\n");
return 0;
_irq_set:
free_irq(client->irq, (void *)chip);
_gpio_init1:
if (power_mgt)
gpio_free(platform_data->io_lpcpd);
_tpm_clean_answer:
tpm_remove_hardware(chip->dev);
end:
pr_info("TPM I2C initialisation fail\n");
dev_info(chip->dev, "TPM I2C initialisation fail\n");
return ret;
}
......@@ -775,7 +831,7 @@ static int tpm_stm_i2c_pm_suspend(struct device *dev)
struct st33zp24_platform_data *pin_infos = dev->platform_data;
int ret = 0;
if (power_mgt)
if (gpio_is_valid(pin_infos->io_lpcpd))
gpio_set_value(pin_infos->io_lpcpd, 0);
else
ret = tpm_pm_suspend(dev);
......@@ -794,7 +850,7 @@ static int tpm_stm_i2c_pm_resume(struct device *dev)
int ret = 0;
if (power_mgt) {
if (gpio_is_valid(pin_infos->io_lpcpd)) {
gpio_set_value(pin_infos->io_lpcpd, 1);
ret = wait_for_serirq_timeout(chip,
(chip->ops->status(chip) &
......@@ -813,6 +869,15 @@ static const struct i2c_device_id tpm_stm_i2c_id[] = {
{TPM_ST33_I2C, 0},
{}
};
#ifdef CONFIG_OF
static const struct of_device_id of_st33zp24_i2c_match[] = {
{ .compatible = "st,st33zp24-i2c", },
{}
};
MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
#endif
MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
tpm_stm_i2c_pm_resume);
......@@ -821,6 +886,7 @@ static struct i2c_driver tpm_stm_i2c_driver = {
.owner = THIS_MODULE,
.name = TPM_ST33_I2C,
.pm = &tpm_stm_i2c_ops,
.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
},
.probe = tpm_stm_i2c_probe,
.remove = tpm_stm_i2c_remove,
......
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