From e31f9b826486c48f20e4f1066aa3e23e111c3a4e Mon Sep 17 00:00:00 2001 From: Chris Blair Date: Thu, 26 Jan 2012 22:17:03 +0100 Subject: [PATCH] mfd: Add support for no-interrupt stmpe config Adds support for boards which have an STMPE device without the interrupt pin connected. Acked-by: Viresh Kumar Signed-off-by: Chris Blair Tested-by: Michel Jaouen Reviewed-by: Srinidhi Kasagar Signed-off-by: Linus Walleij Acked-by: Viresh Kumar Signed-off-by: Samuel Ortiz --- drivers/mfd/stmpe.c | 134 +++++++++++++++++++++++++++----------- include/linux/mfd/stmpe.h | 1 + 2 files changed, 97 insertions(+), 38 deletions(-) diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c index e07947e56b2a..2dd8d49cb30b 100644 --- a/drivers/mfd/stmpe.c +++ b/drivers/mfd/stmpe.c @@ -298,6 +298,11 @@ static struct mfd_cell stmpe_gpio_cell = { .num_resources = ARRAY_SIZE(stmpe_gpio_resources), }; +static struct mfd_cell stmpe_gpio_cell_noirq = { + .name = "stmpe-gpio", + /* gpio cell resources consist of an irq only so no resources here */ +}; + /* * Keypad (1601, 2401, 2403) */ @@ -346,6 +351,13 @@ static struct stmpe_variant_block stmpe801_blocks[] = { }, }; +static struct stmpe_variant_block stmpe801_blocks_noirq[] = { + { + .cell = &stmpe_gpio_cell_noirq, + .block = STMPE_BLOCK_GPIO, + }, +}; + static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { @@ -367,6 +379,17 @@ static struct stmpe_variant_info stmpe801 = { .enable = stmpe801_enable, }; +static struct stmpe_variant_info stmpe801_noirq = { + .name = "stmpe801", + .id_val = STMPE801_ID, + .id_mask = 0xffff, + .num_gpios = 8, + .regs = stmpe801_regs, + .blocks = stmpe801_blocks_noirq, + .num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq), + .enable = stmpe801_enable, +}; + /* * Touchscreen (STMPE811 or STMPE610) */ @@ -712,7 +735,7 @@ static struct stmpe_variant_info stmpe2403 = { .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */ }; -static struct stmpe_variant_info *stmpe_variant_info[] = { +static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = { [STMPE610] = &stmpe610, [STMPE801] = &stmpe801, [STMPE811] = &stmpe811, @@ -721,6 +744,16 @@ static struct stmpe_variant_info *stmpe_variant_info[] = { [STMPE2403] = &stmpe2403, }; +/* + * These devices can be connected in a 'no-irq' configuration - the irq pin + * is not used and the device cannot interrupt the CPU. Here we only list + * devices which support this configuration - the driver will fail probing + * for any devices not listed here which are configured in this way. + */ +static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = { + [STMPE801] = &stmpe801_noirq, +}; + static irqreturn_t stmpe_irq(int irq, void *data) { struct stmpe *stmpe = data; @@ -864,7 +897,7 @@ 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; + u8 icr = 0; unsigned int id; u8 data[2]; int ret; @@ -887,31 +920,33 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe) if (ret) return ret; - if (id == STMPE801_ID) - icr = STMPE801_REG_SYS_CTRL_INT_EN; - else - icr = STMPE_ICR_LSB_GIM; - - /* STMPE801 doesn't support Edge interrupts */ - if (id != STMPE801_ID) { - if (irq_trigger == IRQF_TRIGGER_FALLING || - irq_trigger == IRQF_TRIGGER_RISING) - icr |= STMPE_ICR_LSB_EDGE; - } - - if (irq_trigger == IRQF_TRIGGER_RISING || - irq_trigger == IRQF_TRIGGER_HIGH) { + if (stmpe->irq >= 0) { if (id == STMPE801_ID) - icr |= STMPE801_REG_SYS_CTRL_INT_HI; + icr = STMPE801_REG_SYS_CTRL_INT_EN; else - icr |= STMPE_ICR_LSB_HIGH; - } + icr = STMPE_ICR_LSB_GIM; - if (stmpe->pdata->irq_invert_polarity) { - if (id == STMPE801_ID) - icr ^= STMPE801_REG_SYS_CTRL_INT_HI; - else - icr ^= STMPE_ICR_LSB_HIGH; + /* STMPE801 doesn't support Edge interrupts */ + if (id != STMPE801_ID) { + if (irq_trigger == IRQF_TRIGGER_FALLING || + irq_trigger == IRQF_TRIGGER_RISING) + icr |= STMPE_ICR_LSB_EDGE; + } + + if (irq_trigger == IRQF_TRIGGER_RISING || + irq_trigger == IRQF_TRIGGER_HIGH) { + if (id == STMPE801_ID) + icr |= STMPE801_REG_SYS_CTRL_INT_HI; + else + icr |= STMPE_ICR_LSB_HIGH; + } + + if (stmpe->pdata->irq_invert_polarity) { + if (id == STMPE801_ID) + icr ^= STMPE801_REG_SYS_CTRL_INT_HI; + else + icr ^= STMPE_ICR_LSB_HIGH; + } } if (stmpe->pdata->autosleep) { @@ -1001,19 +1036,38 @@ int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum) stmpe->irq = ci->irq; } + if (stmpe->irq < 0) { + /* use alternate variant info for no-irq mode, if supported */ + dev_info(stmpe->dev, + "%s configured in no-irq mode by platform data\n", + stmpe->variant->name); + if (!stmpe_noirq_variant_info[stmpe->partnum]) { + dev_err(stmpe->dev, + "%s does not support no-irq mode!\n", + stmpe->variant->name); + ret = -ENODEV; + goto free_gpio; + } + stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum]; + } + ret = stmpe_chip_init(stmpe); if (ret) goto free_gpio; - ret = stmpe_irq_init(stmpe); - if (ret) - goto free_gpio; + if (stmpe->irq >= 0) { + ret = stmpe_irq_init(stmpe); + if (ret) + goto free_gpio; - ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq, - pdata->irq_trigger | IRQF_ONESHOT, "stmpe", stmpe); - if (ret) { - dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret); - goto out_removeirq; + ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq, + pdata->irq_trigger | IRQF_ONESHOT, + "stmpe", stmpe); + if (ret) { + dev_err(stmpe->dev, "failed to request IRQ: %d\n", + ret); + goto out_removeirq; + } } ret = stmpe_devices_init(stmpe); @@ -1026,9 +1080,11 @@ int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum) out_removedevs: mfd_remove_devices(stmpe->dev); - free_irq(stmpe->irq, stmpe); + if (stmpe->irq >= 0) + free_irq(stmpe->irq, stmpe); out_removeirq: - stmpe_irq_remove(stmpe); + if (stmpe->irq >= 0) + stmpe_irq_remove(stmpe); free_gpio: if (pdata->irq_over_gpio) gpio_free(pdata->irq_gpio); @@ -1041,8 +1097,10 @@ int stmpe_remove(struct stmpe *stmpe) { mfd_remove_devices(stmpe->dev); - free_irq(stmpe->irq, stmpe); - stmpe_irq_remove(stmpe); + if (stmpe->irq >= 0) { + free_irq(stmpe->irq, stmpe); + stmpe_irq_remove(stmpe); + } if (stmpe->pdata->irq_over_gpio) gpio_free(stmpe->pdata->irq_gpio); @@ -1057,7 +1115,7 @@ static int stmpe_suspend(struct device *dev) { struct stmpe *stmpe = dev_get_drvdata(dev); - if (device_may_wakeup(dev)) + if (stmpe->irq >= 0 && device_may_wakeup(dev)) enable_irq_wake(stmpe->irq); return 0; @@ -1067,7 +1125,7 @@ static int stmpe_resume(struct device *dev) { struct stmpe *stmpe = dev_get_drvdata(dev); - if (device_may_wakeup(dev)) + if (stmpe->irq >= 0 && device_may_wakeup(dev)) disable_irq_wake(stmpe->irq); return 0; diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h index ca1d7a347600..a1c6aa72cc76 100644 --- a/include/linux/mfd/stmpe.h +++ b/include/linux/mfd/stmpe.h @@ -26,6 +26,7 @@ enum stmpe_partnum { STMPE1601, STMPE2401, STMPE2403, + STMPE_NBR_PARTS }; /* -- 2.20.1