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Date: Mon, 26 Jul 2010 00:35:59 +0200
From: Samuel Ortiz <sameo@...ux.intel.com>
To: Sundar Iyer <sundar.iyer@...ricsson.com>
Cc: l.fu@...gutronix.de, rabin.vincent@...ricsson.com,
linux-kernel@...r.kernel.org, STEricsson_nomadik_linux@...t.st.com,
Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH] mfd-stmpe: add auto sleep feature
Hi Sundar,
On Wed, Jul 21, 2010 at 11:41:07AM +0530, Sundar Iyer wrote:
> From: Sundar R Iyer <sundar.iyer@...ricsson.com>
>
> Some STMPE devices support entering sleep mode automatically on a
> specified timeout of inactivity on the I2C bus with the host system.
Patch applied, thanks.
Cheers,
Samuel.
> Acked-by: Linus Walleij <linus.walleij@...ricsson.com>
> Acked-by: Rabin Vincent <rabin.vincent@...ricsson.com>
> Signed-off-by: Sundar R Iyer <sundar.iyer@...ricsson.com>
> ---
> drivers/mfd/stmpe.c | 70 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/mfd/stmpe.h | 7 ++++
> include/linux/mfd/stmpe.h | 4 ++
> 3 files changed, 81 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
> index a7f3099..0754c5e 100644
> --- a/drivers/mfd/stmpe.c
> +++ b/drivers/mfd/stmpe.c
> @@ -455,6 +455,67 @@ static struct stmpe_variant_block stmpe1601_blocks[] = {
> },
> };
>
> +/* supported autosleep timeout delay (in msecs) */
> +static const int stmpe_autosleep_delay[] = {
> + 4, 16, 32, 64, 128, 256, 512, 1024,
> +};
> +
> +static int stmpe_round_timeout(int timeout)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
> + if (stmpe_autosleep_delay[i] >= timeout)
> + return i;
> + }
> +
> + /*
> + * requests for delays longer than supported should not return the
> + * longest supported delay
> + */
> + return -EINVAL;
> +}
> +
> +static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
> +{
> + int ret;
> +
> + if (!stmpe->variant->enable_autosleep)
> + return -ENOSYS;
> +
> + mutex_lock(&stmpe->lock);
> + ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
> + mutex_unlock(&stmpe->lock);
> +
> + return ret;
> +}
> +
> +/*
> + * Both stmpe 1601/2403 support same layout for autosleep
> + */
> +static int stmpe1601_autosleep(struct stmpe *stmpe,
> + int autosleep_timeout)
> +{
> + int ret, timeout;
> +
> + /* choose the best available timeout */
> + timeout = stmpe_round_timeout(autosleep_timeout);
> + if (timeout < 0) {
> + dev_err(stmpe->dev, "invalid timeout\n");
> + return timeout;
> + }
> +
> + ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
> + STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
> + timeout);
> + if (ret < 0)
> + return ret;
> +
> + return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
> + STPME1601_AUTOSLEEP_ENABLE,
> + STPME1601_AUTOSLEEP_ENABLE);
> +}
> +
> static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
> bool enable)
> {
> @@ -497,6 +558,7 @@ static struct stmpe_variant_info stmpe1601 = {
> .num_irqs = STMPE1601_NR_INTERNAL_IRQS,
> .enable = stmpe1601_enable,
> .get_altfunc = stmpe1601_get_altfunc,
> + .enable_autosleep = stmpe1601_autosleep,
> };
>
> /*
> @@ -589,6 +651,7 @@ static struct stmpe_variant_info stmpe2403 = {
> .num_irqs = STMPE24XX_NR_INTERNAL_IRQS,
> .enable = stmpe24xx_enable,
> .get_altfunc = stmpe24xx_get_altfunc,
> + .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
> };
>
> static struct stmpe_variant_info *stmpe_variant_info[] = {
> @@ -731,6 +794,7 @@ static void stmpe_irq_remove(struct stmpe *stmpe)
> static int __devinit stmpe_chip_init(struct stmpe *stmpe)
> {
> unsigned int irq_trigger = stmpe->pdata->irq_trigger;
> + int autosleep_timeout = stmpe->pdata->autosleep_timeout;
> struct stmpe_variant_info *variant = stmpe->variant;
> u8 icr = STMPE_ICR_LSB_GIM;
> unsigned int id;
> @@ -766,6 +830,12 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe)
> if (stmpe->pdata->irq_invert_polarity)
> icr ^= STMPE_ICR_LSB_HIGH;
>
> + if (stmpe->pdata->autosleep) {
> + ret = stmpe_autosleep(stmpe, autosleep_timeout);
> + if (ret)
> + return ret;
> + }
> +
> return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
> }
>
> diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
> index 991f0ec..0dbdc4e 100644
> --- a/drivers/mfd/stmpe.h
> +++ b/drivers/mfd/stmpe.h
> @@ -49,6 +49,7 @@ struct stmpe_variant_block {
> * Called with the I/O lock held.
> * @get_altfunc: callback to get the alternate function number for the
> * specific block
> + * @enable_autosleep: callback to configure autosleep with specified timeout
> */
> struct stmpe_variant_info {
> const char *name;
> @@ -62,6 +63,7 @@ struct stmpe_variant_info {
> int num_irqs;
> int (*enable)(struct stmpe *stmpe, unsigned int blocks, bool enable);
> int (*get_altfunc)(struct stmpe *stmpe, enum stmpe_block block);
> + int (*enable_autosleep)(struct stmpe *stmpe, int autosleep_timeout);
> };
>
> #define STMPE_ICR_LSB_HIGH (1 << 2)
> @@ -118,6 +120,7 @@ struct stmpe_variant_info {
> #define STMPE1601_NR_INTERNAL_IRQS 9
>
> #define STMPE1601_REG_SYS_CTRL 0x02
> +#define STMPE1601_REG_SYS_CTRL2 0x03
> #define STMPE1601_REG_ICR_LSB 0x11
> #define STMPE1601_REG_IER_LSB 0x13
> #define STMPE1601_REG_ISR_MSB 0x14
> @@ -137,6 +140,10 @@ struct stmpe_variant_info {
> #define STMPE1601_SYS_CTRL_ENABLE_KPC (1 << 1)
> #define STMPE1601_SYSCON_ENABLE_SPWM (1 << 0)
>
> +/* The 1601/2403 share the same masks */
> +#define STMPE1601_AUTOSLEEP_TIMEOUT_MASK (0x7)
> +#define STPME1601_AUTOSLEEP_ENABLE (1 << 3)
> +
> /*
> * STMPE24xx
> */
> diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
> index 90faa98..39ca758 100644
> --- a/include/linux/mfd/stmpe.h
> +++ b/include/linux/mfd/stmpe.h
> @@ -170,6 +170,8 @@ struct stmpe_ts_platform_data {
> * @blocks: bitmask of blocks to enable (use STMPE_BLOCK_*)
> * @irq_trigger: IRQ trigger to use for the interrupt to the host
> * @irq_invert_polarity: IRQ line is connected with reversed polarity
> + * @autosleep: bool to enable/disable stmpe autosleep
> + * @autosleep_timeout: inactivity timeout in milliseconds for autosleep
> * @irq_base: base IRQ number. %STMPE_NR_IRQS irqs will be used, or
> * %STMPE_NR_INTERNAL_IRQS if the GPIO driver is not used.
> * @gpio: GPIO-specific platform data
> @@ -182,6 +184,8 @@ struct stmpe_platform_data {
> int irq_base;
> unsigned int irq_trigger;
> bool irq_invert_polarity;
> + bool autosleep;
> + int autosleep_timeout;
>
> struct stmpe_gpio_platform_data *gpio;
> struct stmpe_keypad_platform_data *keypad;
> --
> 1.7.0
>
--
Intel Open Source Technology Centre
http://oss.intel.com/
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