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: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 7f036630e87a891249dd990e0f3168dee48adb14..3f722630ff923408d34878c48d393a2173fb6810 100644 (file)
--- 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,