From c6a05a0563efd6cddafe4e8c857cf87d1311e83b Mon Sep 17 00:00:00 2001 From: Patrice Chotard Date: Wed, 10 Aug 2016 09:39:15 +0200 Subject: gpio: stmpe: Add STMPE1600 support The particularities of this variant are: - GPIO_XXX_LSB and GPIO_XXX_MSB memory locations are inverted compared to other variants. - There is no Edge detection, Rising Edge and Falling Edge registers. - IRQ flags are cleared when read, no need to write in Status register. Signed-off-by: Amelie DELAUNAY Signed-off-by: Patrice Chotard Reviewed-by: Linus Walleij Signed-off-by: Lee Jones --- drivers/gpio/gpio-stmpe.c | 48 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 38 insertions(+), 10 deletions(-) (limited to 'drivers/gpio/gpio-stmpe.c') diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c index dd0aedf298fb..5c0d8189a304 100644 --- a/drivers/gpio/gpio-stmpe.c +++ b/drivers/gpio/gpio-stmpe.c @@ -144,8 +144,9 @@ static int stmpe_gpio_irq_set_type(struct irq_data *d, unsigned int type) if (type & IRQ_TYPE_LEVEL_LOW || type & IRQ_TYPE_LEVEL_HIGH) return -EINVAL; - /* STMPE801 doesn't have RE and FE registers */ - if (stmpe_gpio->stmpe->partnum == STMPE801) + /* STMPE801 and STMPE 1600 don't have RE and FE registers */ + if (stmpe_gpio->stmpe->partnum == STMPE801 || + stmpe_gpio->stmpe->partnum == STMPE1600) return 0; if (type & IRQ_TYPE_EDGE_RISING) @@ -189,9 +190,10 @@ static void stmpe_gpio_irq_sync_unlock(struct irq_data *d) int i, j; for (i = 0; i < CACHE_NR_REGS; i++) { - /* STMPE801 doesn't have RE and FE registers */ - if ((stmpe->partnum == STMPE801) && - (i != REG_IE)) + /* STMPE801 and STMPE1600 don't have RE and FE registers */ + if ((stmpe->partnum == STMPE801 || + stmpe->partnum == STMPE1600) && + (i != REG_IE)) continue; for (j = 0; j < num_banks; j++) { @@ -224,11 +226,21 @@ static void stmpe_gpio_irq_unmask(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct stmpe_gpio *stmpe_gpio = gpiochip_get_data(gc); + struct stmpe *stmpe = stmpe_gpio->stmpe; int offset = d->hwirq; int regoffset = offset / 8; int mask = 1 << (offset % 8); stmpe_gpio->regs[REG_IE][regoffset] |= mask; + + /* + * STMPE1600 workaround: to be able to get IRQ from pins, + * a read must be done on GPMR register, or a write in + * GPSR or GPCR registers + */ + if (stmpe->partnum == STMPE1600) + stmpe_reg_read(stmpe, + stmpe->regs[STMPE_IDX_GPMR_LSB + regoffset]); } static void stmpe_dbg_show_one(struct seq_file *s, @@ -301,6 +313,7 @@ static void stmpe_dbg_show_one(struct seq_file *s, fall = !!(ret & mask); case STMPE801: + case STMPE1600: irqen_reg = stmpe->regs[STMPE_IDX_IEGPIOR_LSB + bank]; break; @@ -347,18 +360,32 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev) { struct stmpe_gpio *stmpe_gpio = dev; struct stmpe *stmpe = stmpe_gpio->stmpe; - u8 statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB]; + u8 statmsbreg; int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8); u8 status[num_banks]; int ret; int i; + /* + * the stmpe_block_read() call below, imposes to set statmsbreg + * with the register located at the lowest address. As STMPE1600 + * variant is the only one which respect registers address's order + * (LSB regs located at lowest address than MSB ones) whereas all + * the others have a registers layout with MSB located before the + * LSB regs. + */ + if (stmpe->partnum == STMPE1600) + statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_LSB]; + else + statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB]; + ret = stmpe_block_read(stmpe, statmsbreg, num_banks, status); if (ret < 0) return IRQ_NONE; for (i = 0; i < num_banks; i++) { - int bank = num_banks - i - 1; + int bank = (stmpe_gpio->stmpe->partnum == STMPE1600) ? i : + num_banks - i - 1; unsigned int enabled = stmpe_gpio->regs[REG_IE][bank]; unsigned int stat = status[i]; @@ -378,10 +405,11 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev) /* * interrupt status register write has no effect on - * 801 and 1801, bits are cleared when read. - * Edge detect register is not present on 801 and 1801 + * 801/1801/1600, bits are cleared when read. + * Edge detect register is not present on 801/1600/1801 */ - if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1801) { + if (stmpe->partnum != STMPE801 || stmpe->partnum != STMPE1600 || + stmpe->partnum != STMPE1801) { stmpe_reg_write(stmpe, statmsbreg + i, status[i]); stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_LSB + i], -- cgit v1.2.3-55-g7522