static int dcon_init_xo_1(struct dcon_priv *dcon) { unsigned char lob; if (gpio_request(OLPC_GPIO_DCON_STAT0, "OLPC-DCON")) { printk(KERN_ERR "olpc-dcon: failed to request STAT0 GPIO\n"); return -EIO; } if (gpio_request(OLPC_GPIO_DCON_STAT1, "OLPC-DCON")) { printk(KERN_ERR "olpc-dcon: failed to request STAT1 GPIO\n"); goto err_gp_stat1; } if (gpio_request(OLPC_GPIO_DCON_IRQ, "OLPC-DCON")) { printk(KERN_ERR "olpc-dcon: failed to request IRQ GPIO\n"); goto err_gp_irq; } if (gpio_request(OLPC_GPIO_DCON_LOAD, "OLPC-DCON")) { printk(KERN_ERR "olpc-dcon: failed to request LOAD GPIO\n"); goto err_gp_load; } if (gpio_request(OLPC_GPIO_DCON_BLANK, "OLPC-DCON")) { printk(KERN_ERR "olpc-dcon: failed to request BLANK GPIO\n"); goto err_gp_blank; } /* Turn off the event enable for GPIO7 just to be safe */ cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE); /* * Determine the current state by reading the GPIO bit; earlier * stages of the boot process have established the state. * * Note that we read GPIO_OUPUT_VAL rather than GPIO_READ_BACK here; * this is because OFW will disable input for the pin and set a value.. * READ_BACK will only contain a valid value if input is enabled and * then a value is set. So, future readings of the pin can use * READ_BACK, but the first one cannot. Awesome, huh? */ dcon->curr_src = cs5535_gpio_isset(OLPC_GPIO_DCON_LOAD, GPIO_OUTPUT_VAL) ? DCON_SOURCE_CPU : DCON_SOURCE_DCON; dcon->pending_src = dcon->curr_src; /* Set the directions for the GPIO pins */ gpio_direction_input(OLPC_GPIO_DCON_STAT0); gpio_direction_input(OLPC_GPIO_DCON_STAT1); gpio_direction_input(OLPC_GPIO_DCON_IRQ); gpio_direction_input(OLPC_GPIO_DCON_BLANK); gpio_direction_output(OLPC_GPIO_DCON_LOAD, dcon->curr_src == DCON_SOURCE_CPU); /* Set up the interrupt mappings */ /* Set the IRQ to pair 2 */ cs5535_gpio_setup_event(OLPC_GPIO_DCON_IRQ, 2, 0); /* Enable group 2 to trigger the DCON interrupt */ cs5535_gpio_set_irq(2, DCON_IRQ); /* Select edge level for interrupt (in PIC) */ lob = inb(0x4d0); lob &= ~(1 << DCON_IRQ); outb(lob, 0x4d0); /* Register the interrupt handler */ if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", dcon)) { printk(KERN_ERR "olpc-dcon: failed to request DCON's irq\n"); goto err_req_irq; } /* Clear INV_EN for GPIO7 (DCONIRQ) */ cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_INVERT); /* Enable filter for GPIO12 (DCONBLANK) */ cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_FILTER); /* Disable filter for GPIO7 */ cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_FILTER); /* Disable event counter for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */ cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_EVENT_COUNT); cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_EVENT_COUNT); /* Add GPIO12 to the Filter Event Pair #7 */ cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_FE7_SEL); /* Turn off negative Edge Enable for GPIO12 */ cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_EN); /* Enable negative Edge Enable for GPIO7 */ cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_EN); /* Zero the filter amount for Filter Event Pair #7 */ cs5535_gpio_set(0, GPIO_FLTR7_AMOUNT); /* Clear the negative edge status for GPIO7 and GPIO12 */ cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_STS); cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_STS); /* FIXME: Clear the positive status as well, just to be sure */ cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_POSITIVE_EDGE_STS); cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_POSITIVE_EDGE_STS); /* Enable events for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */ cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE); cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_EVENTS_ENABLE); return 0; err_req_irq: gpio_free(OLPC_GPIO_DCON_BLANK); err_gp_blank: gpio_free(OLPC_GPIO_DCON_LOAD); err_gp_load: gpio_free(OLPC_GPIO_DCON_IRQ); err_gp_irq: gpio_free(OLPC_GPIO_DCON_STAT1); err_gp_stat1: gpio_free(OLPC_GPIO_DCON_STAT0); return -EIO; }
static int chip_gpio_get(struct gpio_chip *chip, unsigned offset) { return cs5535_gpio_isset(offset, GPIO_READ_BACK); }