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-rw-r--r--drivers/char/tpm/tpm_i2c_stm_st33.c166
1 files changed, 116 insertions, 50 deletions
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 7f036630e87a..3f722630ff92 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -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;
+
+ 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;
+ }
-static int power_mgt = 1;
-module_param(power_mgt, int, 0444);
-MODULE_PARM_DESC(power_mgt, "Power Management");
+ /* 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) &
@@ -813,14 +869,24 @@ 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);
static struct i2c_driver tpm_stm_i2c_driver = {
.driver = {
- .owner = THIS_MODULE,
- .name = TPM_ST33_I2C,
- .pm = &tpm_stm_i2c_ops,
+ .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,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 16:11:01 +0000