diff options
author | Christophe Ricard <christophe.ricard@gmail.com> | 2014-12-01 18:32:55 (GMT) |
---|---|---|
committer | Peter Huewe <peterhuewe@gmx.de> | 2015-01-17 13:00:07 (GMT) |
commit | c36b1b2d1fa5b24e21482f33694a8ca0c653ecd9 (patch) | |
tree | f5674da60c65fac8ff236b5e9067bc6bb20734dc /drivers/char | |
parent | 875edad528cf29b382e82837e652e997aec16c49 (diff) | |
download | linux-c36b1b2d1fa5b24e21482f33694a8ca0c653ecd9.tar.xz |
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>
Diffstat (limited to 'drivers/char')
-rw-r--r-- | drivers/char/tpm/tpm_i2c_stm_st33.c | 166 |
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 7f03663..3f72263 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, |