Re: [PATCH V6 18/30] thermal: exynos: Add support to handle manyinstances of TMU

From: Eduardo Valentin
Date: Fri Jun 21 2013 - 10:28:44 EST

On 21-06-2013 08:46, amit daniel kachhap wrote:
> Hi Eduardo,
>
> On Thu, Jun 20, 2013 at 4:57 AM, Eduardo Valentin
> <eduardo.valentin@xxxxxx> wrote:
>> On 17-06-2013 02:46, Amit Daniel Kachhap wrote:
>>> This patch adds support to handle multiple instances of the TMU controllers.
>>> This is done by removing the static structure to register with the core thermal
>>> and creating it dynamically for each instance of the TMU controller. The
>>> interrupt is made shared type to handle shared interrupts. Also
>>> the identifier of the TMU controller is extracted from device tree alias.
>>>
>>> Acked-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
>>> Acked-by: Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
>>> Signed-off-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
>>> ---
>>> drivers/thermal/samsung/exynos_thermal_common.h | 1 +
>>> drivers/thermal/samsung/exynos_tmu.c | 147 ++++++++++++++++-------
>>> drivers/thermal/samsung/exynos_tmu.h | 13 ++
>>> drivers/thermal/samsung/exynos_tmu_data.c | 145 ++++++++++++----------
>>> drivers/thermal/samsung/exynos_tmu_data.h | 4 +-
>>> 5 files changed, 197 insertions(+), 113 deletions(-)
>>>
>>> diff --git a/drivers/thermal/samsung/exynos_thermal_common.h b/drivers/thermal/samsung/exynos_thermal_common.h
>>> index dd0077e..0c189d6 100644
>>> --- a/drivers/thermal/samsung/exynos_thermal_common.h
>>> +++ b/drivers/thermal/samsung/exynos_thermal_common.h
>>> @@ -84,6 +84,7 @@ struct thermal_sensor_conf {
>>> struct thermal_cooling_conf cooling_data;
>>> void *driver_data;
>>> void *pzone_data;
>>> + struct device *dev;
>>> };
>>>
>>> /*Functions used exynos based thermal sensor driver*/
>>> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
>>> index 4356118..1880c4e 100644
>>> --- a/drivers/thermal/samsung/exynos_tmu.c
>>> +++ b/drivers/thermal/samsung/exynos_tmu.c
>>> @@ -26,15 +26,32 @@
>>> #include <linux/interrupt.h>
>>> #include <linux/module.h>
>>> #include <linux/of.h>
>>> +#include <linux/of_address.h>
>>> +#include <linux/of_irq.h>
>>> #include <linux/platform_device.h>
>>>
>>> #include "exynos_thermal_common.h"
>>> #include "exynos_tmu.h"
>>> #include "exynos_tmu_data.h"
>>>
>>> +/**
>>> + * struct exynos_tmu_data : A structure to hold the private data of the TMU
>>> + driver
>>> + * @id: identifier of the one instance of the TMU controller.
>>> + * @pdata: pointer to the tmu platform/configuration data
>>> + * @base: base address of the single instance of the TMU controller.
>>> + * @irq: irq number of the TMU controller.
>>> + * @soc: id of the SOC type.
>>> + * @irq_work: pointer to the irq work structure.
>>> + * @lock: lock to implement synchronization.
>>> + * @clk: pointer to the clock structure.
>>> + * @temp_error1: fused value of the first point trim.
>>> + * @temp_error2: fused value of the second point trim.
>>> + * @reg_conf: pointer to structure to register with core thermal.
>>> + */
>>> struct exynos_tmu_data {
>>> + int id;
>>> struct exynos_tmu_platform_data *pdata;
>>> - struct resource *mem;
>>> void __iomem *base;
>>> int irq;
>>> enum soc_type soc;
>>> @@ -42,6 +59,7 @@ struct exynos_tmu_data {
>>> struct mutex lock;
>>> struct clk *clk;
>>> u8 temp_error1, temp_error2;
>>> + struct thermal_sensor_conf *reg_conf;
>>> };
>>>
>>> /*
>>> @@ -345,12 +363,6 @@ static int exynos_tmu_set_emulation(void *drv_data, unsigned long temp)
>>> { return -EINVAL; }
>>> #endif/*CONFIG_THERMAL_EMULATION*/
>>>
>>> -static struct thermal_sensor_conf exynos_sensor_conf = {
>>> - .name = "exynos-therm",
>>> - .read_temperature = (int (*)(void *))exynos_tmu_read,
>>> - .write_emul_temp = exynos_tmu_set_emulation,
>>> -};
>>> -
>>> static void exynos_tmu_work(struct work_struct *work)
>>> {
>>> struct exynos_tmu_data *data = container_of(work,
>>> @@ -359,7 +371,7 @@ static void exynos_tmu_work(struct work_struct *work)
>>> const struct exynos_tmu_registers *reg = pdata->registers;
>>> unsigned int val_irq;
>>>
>>> - exynos_report_trigger(&exynos_sensor_conf);
>>> + exynos_report_trigger(data->reg_conf);
>>> mutex_lock(&data->lock);
>>> clk_enable(data->clk);
>>>
>>> @@ -404,33 +416,73 @@ MODULE_DEVICE_TABLE(of, exynos_tmu_match);
>>> #endif
>>>
>>> static inline struct exynos_tmu_platform_data *exynos_get_driver_data(
>>> - struct platform_device *pdev)
>>> + struct platform_device *pdev, int id)
>>> {
>>> + struct exynos_tmu_init_data *data_table;
>>> + struct exynos_tmu_platform_data *tmu_data;
>>> #ifdef CONFIG_OF
>>> if (pdev->dev.of_node) {
>>> const struct of_device_id *match;
>>> match = of_match_node(exynos_tmu_match, pdev->dev.of_node);
>>> if (!match)
>>> return NULL;
>>> - return (struct exynos_tmu_platform_data *) match->data;
>>> + data_table = (struct exynos_tmu_init_data *) match->data;
>>> + if (!data_table || id >= data_table->tmu_count)
>>> + return NULL;
>>> + tmu_data = data_table->tmu_data;
>>> + return (struct exynos_tmu_platform_data *) (tmu_data + id);
>>> }
>>> #endif
>>> return NULL;
>>> }
>>>
>>> -static int exynos_tmu_probe(struct platform_device *pdev)
>>> +static int exynos_map_dt_data(struct platform_device *pdev)
>>> {
>>> - struct exynos_tmu_data *data;
>>> - struct exynos_tmu_platform_data *pdata = pdev->dev.platform_data;
>>> - int ret, i;
>>> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>>> + struct exynos_tmu_platform_data *pdata;
>>> + struct resource res;
>>>
>>> - if (!pdata)
>>> - pdata = exynos_get_driver_data(pdev);
>>> + if (!data)
>>> + return -ENODEV;
>>> +
>>> + data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
>>> + if (data->id < 0)
>>> + data->id = 0;
>>>
>>> + data->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
>>> + if (data->irq <= 0) {
>>> + dev_err(&pdev->dev, "failed to get IRQ\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
>>> + dev_err(&pdev->dev, "failed to get Resource 0\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + data->base = devm_ioremap(&pdev->dev, res.start, resource_size(&res));
>>> + if (!data->base) {
>>> + dev_err(&pdev->dev, "Failed to ioremap memory\n");
>>> + return -EADDRNOTAVAIL;
>>> + }
>>> +
>>> + pdata = exynos_get_driver_data(pdev, data->id);
>>> if (!pdata) {
>>> dev_err(&pdev->dev, "No platform init data supplied.\n");
>>> return -ENODEV;
>>> }
>>> + data->pdata = pdata;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int exynos_tmu_probe(struct platform_device *pdev)
>>> +{
>>> + struct exynos_tmu_data *data;
>>> + struct exynos_tmu_platform_data *pdata;
>>> + struct thermal_sensor_conf *sensor_conf;
>>> + int ret, i;
>>> +
>>> data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
>>> GFP_KERNEL);
>>> if (!data) {
>>> @@ -438,21 +490,18 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>>> return -ENOMEM;
>>> }
>>>
>>> - data->irq = platform_get_irq(pdev, 0);
>>> - if (data->irq < 0) {
>>> - dev_err(&pdev->dev, "Failed to get platform irq\n");
>>> - return data->irq;
>>> - }
>>> + platform_set_drvdata(pdev, data);
>>> + mutex_init(&data->lock);
>>>
>>> - INIT_WORK(&data->irq_work, exynos_tmu_work);
>>> + ret = exynos_map_dt_data(pdev);
>>> + if (ret)
>>> + return ret;
>>>
>>> - data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> - data->base = devm_ioremap_resource(&pdev->dev, data->mem);
>>> - if (IS_ERR(data->base))
>>> - return PTR_ERR(data->base);
>>> + pdata = data->pdata;
>>>
>>> + INIT_WORK(&data->irq_work, exynos_tmu_work);
>>> ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
>>> - IRQF_TRIGGER_RISING, "exynos-tmu", data);
>>> + IRQF_TRIGGER_RISING | IRQF_SHARED, dev_name(&pdev->dev), data);
>>
>> Lets think about this poing: You request the IRQ before data->reg_conf
>> is allocated (below). Does it mean, from this point you can get called
>> to the IRQ handler even if reg_conf is not set? What happens then? I see
>> your irqhandler/worker use it.
>
> Good catch. Will put a check in the IRQ handler.

Consider also moving the IRQ request to a point where your driver is
capable of serving IRQs already.

>
> Thanks,
> Amit Daniel
>>
>>> if (ret) {
>>> dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
>>> return ret;
>>> @@ -477,10 +526,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>>> goto err_clk;
>>> }
>>>
>>> - data->pdata = pdata;
>>> - platform_set_drvdata(pdev, data);
>>> - mutex_init(&data->lock);
>>> -
>>> ret = exynos_tmu_initialize(pdev);
>>> if (ret) {
>>> dev_err(&pdev->dev, "Failed to initialize TMU\n");
>>> @@ -489,31 +534,43 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>>>
>>> exynos_tmu_control(pdev, true);
>>>
>>> - /* Register the sensor with thermal management interface */
>>> - (&exynos_sensor_conf)->driver_data = data;
>>> - exynos_sensor_conf.trip_data.trip_count = pdata->trigger_enable[0] +
>>> + /* Allocate a structure to register with the exynos core thermal */
>>> + sensor_conf = devm_kzalloc(&pdev->dev,
>>> + sizeof(struct thermal_sensor_conf), GFP_KERNEL);
>>> + if (!sensor_conf) {
>>> + dev_err(&pdev->dev, "Failed to allocate registration struct\n");
>>> + ret = -ENOMEM;
>>> + goto err_clk;
>>> + }
>>> + data->reg_conf = sensor_conf;
>>> + sprintf(sensor_conf->name, "therm_zone%d", data->id);
>>> + sensor_conf->read_temperature = (int (*)(void *))exynos_tmu_read;
>>> + sensor_conf->write_emul_temp =
>>> + (int (*)(void *, unsigned long))exynos_tmu_set_emulation;
>>> + sensor_conf->driver_data = data;
>>> + sensor_conf->trip_data.trip_count = pdata->trigger_enable[0] +
>>> pdata->trigger_enable[1] + pdata->trigger_enable[2]+
>>> pdata->trigger_enable[3];
>>>
>>> - for (i = 0; i < exynos_sensor_conf.trip_data.trip_count; i++) {
>>> - exynos_sensor_conf.trip_data.trip_val[i] =
>>> + for (i = 0; i < sensor_conf->trip_data.trip_count; i++) {
>>> + sensor_conf->trip_data.trip_val[i] =
>>> pdata->threshold + pdata->trigger_levels[i];
>>> - exynos_sensor_conf.trip_data.trip_type[i] =
>>> + sensor_conf->trip_data.trip_type[i] =
>>> pdata->trigger_type[i];
>>> }
>>>
>>> - exynos_sensor_conf.trip_data.trigger_falling = pdata->threshold_falling;
>>> + sensor_conf->trip_data.trigger_falling = pdata->threshold_falling;
>>>
>>> - exynos_sensor_conf.cooling_data.freq_clip_count =
>>> - pdata->freq_tab_count;
>>> + sensor_conf->cooling_data.freq_clip_count = pdata->freq_tab_count;
>>> for (i = 0; i < pdata->freq_tab_count; i++) {
>>> - exynos_sensor_conf.cooling_data.freq_data[i].freq_clip_max =
>>> + sensor_conf->cooling_data.freq_data[i].freq_clip_max =
>>> pdata->freq_tab[i].freq_clip_max;
>>> - exynos_sensor_conf.cooling_data.freq_data[i].temp_level =
>>> + sensor_conf->cooling_data.freq_data[i].temp_level =
>>> pdata->freq_tab[i].temp_level;
>>> }
>>> -
>>> - ret = exynos_register_thermal(&exynos_sensor_conf);
>>> + sensor_conf->dev = &pdev->dev;
>>> + /* Register the sensor with thermal management interface */
>>> + ret = exynos_register_thermal(sensor_conf);
>>> if (ret) {
>>> dev_err(&pdev->dev, "Failed to register thermal interface\n");
>>> goto err_clk;
>>> @@ -531,7 +588,7 @@ static int exynos_tmu_remove(struct platform_device *pdev)
>>>
>>> exynos_tmu_control(pdev, false);
>>>
>>> - exynos_unregister_thermal(&exynos_sensor_conf);
>>> + exynos_unregister_thermal(data->reg_conf);
>>>
>>> clk_unprepare(data->clk);
>>>
>>> diff --git a/drivers/thermal/samsung/exynos_tmu.h b/drivers/thermal/samsung/exynos_tmu.h
>>> index 619a34c..b614407 100644
>>> --- a/drivers/thermal/samsung/exynos_tmu.h
>>> +++ b/drivers/thermal/samsung/exynos_tmu.h
>>> @@ -248,4 +248,17 @@ struct exynos_tmu_platform_data {
>>> unsigned int freq_tab_count;
>>> const struct exynos_tmu_registers *registers;
>>> };
>>> +
>>> +/**
>>> + * struct exynos_tmu_init_data
>>> + * @tmu_count: number of TMU instances.
>>> + * @tmu_data: platform data of all TMU instances.
>>> + * This structure is required to store data for multi-instance exynos tmu
>>> + * driver.
>>> + */
>>> +struct exynos_tmu_init_data {
>>> + int tmu_count;
>>> + struct exynos_tmu_platform_data tmu_data[];
>>> +};
>>> +
>>> #endif /* _EXYNOS_TMU_H */
>>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.c b/drivers/thermal/samsung/exynos_tmu_data.c
>>> index 7fcf183..06ecfb0 100644
>>> --- a/drivers/thermal/samsung/exynos_tmu_data.c
>>> +++ b/drivers/thermal/samsung/exynos_tmu_data.c
>>> @@ -48,38 +48,44 @@ static const struct exynos_tmu_registers exynos4210_tmu_registers = {
>>> .tmu_intstat = EXYNOS_TMU_REG_INTSTAT,
>>> .tmu_intclear = EXYNOS_TMU_REG_INTCLEAR,
>>> };
>>> -struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
>>> - .threshold = 80,
>>> - .trigger_levels[0] = 5,
>>> - .trigger_levels[1] = 20,
>>> - .trigger_levels[2] = 30,
>>> - .trigger_enable[0] = 1,
>>> - .trigger_enable[1] = 1,
>>> - .trigger_enable[2] = 1,
>>> - .trigger_enable[3] = 0,
>>> - .trigger_type[0] = THROTTLE_ACTIVE,
>>> - .trigger_type[1] = THROTTLE_ACTIVE,
>>> - .trigger_type[2] = SW_TRIP,
>>> - .max_trigger_level = 4,
>>> - .gain = 15,
>>> - .reference_voltage = 7,
>>> - .cal_type = TYPE_ONE_POINT_TRIMMING,
>>> - .min_efuse_value = 40,
>>> - .max_efuse_value = 100,
>>> - .first_point_trim = 25,
>>> - .second_point_trim = 85,
>>> - .default_temp_offset = 50,
>>> - .freq_tab[0] = {
>>> - .freq_clip_max = 800 * 1000,
>>> - .temp_level = 85,
>>> - },
>>> - .freq_tab[1] = {
>>> - .freq_clip_max = 200 * 1000,
>>> - .temp_level = 100,
>>> +
>>> +struct exynos_tmu_init_data const exynos4210_default_tmu_data = {
>>> + .tmu_data = {
>>> + {
>>> + .threshold = 80,
>>> + .trigger_levels[0] = 5,
>>> + .trigger_levels[1] = 20,
>>> + .trigger_levels[2] = 30,
>>> + .trigger_enable[0] = 1,
>>> + .trigger_enable[1] = 1,
>>> + .trigger_enable[2] = 1,
>>> + .trigger_enable[3] = 0,
>>> + .trigger_type[0] = THROTTLE_ACTIVE,
>>> + .trigger_type[1] = THROTTLE_ACTIVE,
>>> + .trigger_type[2] = SW_TRIP,
>>> + .max_trigger_level = 4,
>>> + .gain = 15,
>>> + .reference_voltage = 7,
>>> + .cal_type = TYPE_ONE_POINT_TRIMMING,
>>> + .min_efuse_value = 40,
>>> + .max_efuse_value = 100,
>>> + .first_point_trim = 25,
>>> + .second_point_trim = 85,
>>> + .default_temp_offset = 50,
>>> + .freq_tab[0] = {
>>> + .freq_clip_max = 800 * 1000,
>>> + .temp_level = 85,
>>> + },
>>> + .freq_tab[1] = {
>>> + .freq_clip_max = 200 * 1000,
>>> + .temp_level = 100,
>>> + },
>>> + .freq_tab_count = 2,
>>> + .type = SOC_ARCH_EXYNOS4210,
>>> + .registers = &exynos4210_tmu_registers,
>>> + },
>>> },
>>> - .freq_tab_count = 2,
>>> - .type = SOC_ARCH_EXYNOS4210,
>>> - .registers = &exynos4210_tmu_registers,
>>> + .tmu_count = 1,
>>> };
>>> #endif
>>>
>>> @@ -120,41 +126,48 @@ static const struct exynos_tmu_registers exynos5250_tmu_registers = {
>>> .emul_time_shift = EXYNOS_EMUL_TIME_SHIFT,
>>> .emul_time_mask = EXYNOS_EMUL_TIME_MASK,
>>> };
>>> -struct exynos_tmu_platform_data const exynos5250_default_tmu_data = {
>>> - .threshold_falling = 10,
>>> - .trigger_levels[0] = 85,
>>> - .trigger_levels[1] = 103,
>>> - .trigger_levels[2] = 110,
>>> - .trigger_levels[3] = 120,
>>> - .trigger_enable[0] = 1,
>>> - .trigger_enable[1] = 1,
>>> - .trigger_enable[2] = 1,
>>> - .trigger_enable[3] = 0,
>>> - .trigger_type[0] = THROTTLE_ACTIVE,
>>> - .trigger_type[1] = THROTTLE_ACTIVE,
>>> - .trigger_type[2] = SW_TRIP,
>>> - .trigger_type[3] = HW_TRIP,
>>> - .max_trigger_level = 4,
>>> - .gain = 8,
>>> - .reference_voltage = 16,
>>> - .noise_cancel_mode = 4,
>>> - .cal_type = TYPE_ONE_POINT_TRIMMING,
>>> - .efuse_value = 55,
>>> - .min_efuse_value = 40,
>>> - .max_efuse_value = 100,
>>> - .first_point_trim = 25,
>>> - .second_point_trim = 85,
>>> - .default_temp_offset = 50,
>>> - .freq_tab[0] = {
>>> - .freq_clip_max = 800 * 1000,
>>> - .temp_level = 85,
>>> - },
>>> - .freq_tab[1] = {
>>> - .freq_clip_max = 200 * 1000,
>>> - .temp_level = 103,
>>> - },
>>> - .freq_tab_count = 2,
>>> - .type = SOC_ARCH_EXYNOS,
>>> +
>>> +#define EXYNOS5250_TMU_DATA \
>>> + .threshold_falling = 10, \
>>> + .trigger_levels[0] = 85, \
>>> + .trigger_levels[1] = 103, \
>>> + .trigger_levels[2] = 110, \
>>> + .trigger_levels[3] = 120, \
>>> + .trigger_enable[0] = 1, \
>>> + .trigger_enable[1] = 1, \
>>> + .trigger_enable[2] = 1, \
>>> + .trigger_enable[3] = 0, \
>>> + .trigger_type[0] = THROTTLE_ACTIVE, \
>>> + .trigger_type[1] = THROTTLE_ACTIVE, \
>>> + .trigger_type[2] = SW_TRIP, \
>>> + .trigger_type[3] = HW_TRIP, \
>>> + .max_trigger_level = 4, \
>>> + .gain = 8, \
>>> + .reference_voltage = 16, \
>>> + .noise_cancel_mode = 4, \
>>> + .cal_type = TYPE_ONE_POINT_TRIMMING, \
>>> + .efuse_value = 55, \
>>> + .min_efuse_value = 40, \
>>> + .max_efuse_value = 100, \
>>> + .first_point_trim = 25, \
>>> + .second_point_trim = 85, \
>>> + .default_temp_offset = 50, \
>>> + .freq_tab[0] = { \
>>> + .freq_clip_max = 800 * 1000, \
>>> + .temp_level = 85, \
>>> + }, \
>>> + .freq_tab[1] = { \
>>> + .freq_clip_max = 200 * 1000, \
>>> + .temp_level = 103, \
>>> + }, \
>>> + .freq_tab_count = 2, \
>>> + .type = SOC_ARCH_EXYNOS, \
>>> .registers = &exynos5250_tmu_registers,
>>> +
>>> +struct exynos_tmu_init_data const exynos5250_default_tmu_data = {
>>> + .tmu_data = {
>>> + { EXYNOS5250_TMU_DATA },
>>> + },
>>> + .tmu_count = 1,
>>> };
>>> #endif
>>> diff --git a/drivers/thermal/samsung/exynos_tmu_data.h b/drivers/thermal/samsung/exynos_tmu_data.h
>>> index 4acf070..139dbbb 100644
>>> --- a/drivers/thermal/samsung/exynos_tmu_data.h
>>> +++ b/drivers/thermal/samsung/exynos_tmu_data.h
>>> @@ -94,14 +94,14 @@
>>> #define EXYNOS_MAX_TRIGGER_PER_REG 4
>>>
>>> #if defined(CONFIG_CPU_EXYNOS4210)
>>> -extern struct exynos_tmu_platform_data const exynos4210_default_tmu_data;
>>> +extern struct exynos_tmu_init_data const exynos4210_default_tmu_data;
>>> #define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
>>> #else
>>> #define EXYNOS4210_TMU_DRV_DATA (NULL)
>>> #endif
>>>
>>> #if (defined(CONFIG_SOC_EXYNOS5250) || defined(CONFIG_SOC_EXYNOS4412))
>>> -extern struct exynos_tmu_platform_data const exynos5250_default_tmu_data;
>>> +extern struct exynos_tmu_init_data const exynos5250_default_tmu_data;
>>> #define EXYNOS5250_TMU_DRV_DATA (&exynos5250_default_tmu_data)
>>> #else
>>> #define EXYNOS5250_TMU_DRV_DATA (NULL)
>>>
>>
>>
>> --
>> You have got to be excited about what you are doing. (L. Lamport)
>>
>> Eduardo Valentin
>>
>
>


--
You have got to be excited about what you are doing. (L. Lamport)

Eduardo Valentin

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