diff options
Diffstat (limited to 'drivers/staging/dream/gpio_axis.c')
| -rw-r--r-- | drivers/staging/dream/gpio_axis.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/drivers/staging/dream/gpio_axis.c b/drivers/staging/dream/gpio_axis.c deleted file mode 100644 index eb54724b1d3a..000000000000 --- a/drivers/staging/dream/gpio_axis.c +++ /dev/null @@ -1,181 +0,0 @@ -/* drivers/input/misc/gpio_axis.c - * - * Copyright (C) 2007 Google, Inc. - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/gpio.h> -#include <linux/gpio_event.h> -#include <linux/interrupt.h> - -struct gpio_axis_state { - struct input_dev *input_dev; - struct gpio_event_axis_info *info; - uint32_t pos; -}; - -uint16_t gpio_axis_4bit_gray_map_table[] = { - [0x0] = 0x0, [0x1] = 0x1, /* 0000 0001 */ - [0x3] = 0x2, [0x2] = 0x3, /* 0011 0010 */ - [0x6] = 0x4, [0x7] = 0x5, /* 0110 0111 */ - [0x5] = 0x6, [0x4] = 0x7, /* 0101 0100 */ - [0xc] = 0x8, [0xd] = 0x9, /* 1100 1101 */ - [0xf] = 0xa, [0xe] = 0xb, /* 1111 1110 */ - [0xa] = 0xc, [0xb] = 0xd, /* 1010 1011 */ - [0x9] = 0xe, [0x8] = 0xf, /* 1001 1000 */ -}; -uint16_t gpio_axis_4bit_gray_map(struct gpio_event_axis_info *info, uint16_t in) -{ - return gpio_axis_4bit_gray_map_table[in]; -} - -uint16_t gpio_axis_5bit_singletrack_map_table[] = { - [0x10] = 0x00, [0x14] = 0x01, [0x1c] = 0x02, /* 10000 10100 11100 */ - [0x1e] = 0x03, [0x1a] = 0x04, [0x18] = 0x05, /* 11110 11010 11000 */ - [0x08] = 0x06, [0x0a] = 0x07, [0x0e] = 0x08, /* 01000 01010 01110 */ - [0x0f] = 0x09, [0x0d] = 0x0a, [0x0c] = 0x0b, /* 01111 01101 01100 */ - [0x04] = 0x0c, [0x05] = 0x0d, [0x07] = 0x0e, /* 00100 00101 00111 */ - [0x17] = 0x0f, [0x16] = 0x10, [0x06] = 0x11, /* 10111 10110 00110 */ - [0x02] = 0x12, [0x12] = 0x13, [0x13] = 0x14, /* 00010 10010 10011 */ - [0x1b] = 0x15, [0x0b] = 0x16, [0x03] = 0x17, /* 11011 01011 00011 */ - [0x01] = 0x18, [0x09] = 0x19, [0x19] = 0x1a, /* 00001 01001 11001 */ - [0x1d] = 0x1b, [0x15] = 0x1c, [0x11] = 0x1d, /* 11101 10101 10001 */ -}; -uint16_t gpio_axis_5bit_singletrack_map( - struct gpio_event_axis_info *info, uint16_t in) -{ - return gpio_axis_5bit_singletrack_map_table[in]; -} - -static void gpio_event_update_axis(struct gpio_axis_state *as, int report) -{ - struct gpio_event_axis_info *ai = as->info; - int i; - int change; - uint16_t state = 0; - uint16_t pos; - uint16_t old_pos = as->pos; - for (i = ai->count - 1; i >= 0; i--) - state = (state << 1) | gpio_get_value(ai->gpio[i]); - pos = ai->map(ai, state); - if (ai->flags & GPIOEAF_PRINT_RAW) - pr_info("axis %d-%d raw %x, pos %d -> %d\n", - ai->type, ai->code, state, old_pos, pos); - if (report && pos != old_pos) { - if (ai->type == EV_REL) { - change = (ai->decoded_size + pos - old_pos) % - ai->decoded_size; - if (change > ai->decoded_size / 2) - change -= ai->decoded_size; - if (change == ai->decoded_size / 2) { - if (ai->flags & GPIOEAF_PRINT_EVENT) - pr_info("axis %d-%d unknown direction, " - "pos %d -> %d\n", ai->type, - ai->code, old_pos, pos); - change = 0; /* no closest direction */ - } - if (ai->flags & GPIOEAF_PRINT_EVENT) - pr_info("axis %d-%d change %d\n", - ai->type, ai->code, change); - input_report_rel(as->input_dev, ai->code, change); - } else { - if (ai->flags & GPIOEAF_PRINT_EVENT) - pr_info("axis %d-%d now %d\n", - ai->type, ai->code, pos); - input_event(as->input_dev, ai->type, ai->code, pos); - } - input_sync(as->input_dev); - } - as->pos = pos; -} - -static irqreturn_t gpio_axis_irq_handler(int irq, void *dev_id) -{ - struct gpio_axis_state *as = dev_id; - gpio_event_update_axis(as, 1); - return IRQ_HANDLED; -} - -int gpio_event_axis_func(struct input_dev *input_dev, - struct gpio_event_info *info, void **data, int func) -{ - int ret; - int i; - int irq; - struct gpio_event_axis_info *ai; - struct gpio_axis_state *as; - - ai = container_of(info, struct gpio_event_axis_info, info); - if (func == GPIO_EVENT_FUNC_SUSPEND) { - for (i = 0; i < ai->count; i++) - disable_irq(gpio_to_irq(ai->gpio[i])); - return 0; - } - if (func == GPIO_EVENT_FUNC_RESUME) { - for (i = 0; i < ai->count; i++) - enable_irq(gpio_to_irq(ai->gpio[i])); - return 0; - } - - if (func == GPIO_EVENT_FUNC_INIT) { - *data = as = kmalloc(sizeof(*as), GFP_KERNEL); - if (as == NULL) { - ret = -ENOMEM; - goto err_alloc_axis_state_failed; - } - as->input_dev = input_dev; - as->info = ai; - - input_set_capability(input_dev, ai->type, ai->code); - if (ai->type == EV_ABS) { - input_set_abs_params(input_dev, ai->code, 0, - ai->decoded_size - 1, 0, 0); - } - for (i = 0; i < ai->count; i++) { - ret = gpio_request(ai->gpio[i], "gpio_event_axis"); - if (ret < 0) - goto err_request_gpio_failed; - ret = gpio_direction_input(ai->gpio[i]); - if (ret < 0) - goto err_gpio_direction_input_failed; - ret = irq = gpio_to_irq(ai->gpio[i]); - if (ret < 0) - goto err_get_irq_num_failed; - ret = request_irq(irq, gpio_axis_irq_handler, - IRQF_TRIGGER_RISING | - IRQF_TRIGGER_FALLING, - "gpio_event_axis", as); - if (ret < 0) - goto err_request_irq_failed; - } - gpio_event_update_axis(as, 0); - return 0; - } - - ret = 0; - as = *data; - for (i = ai->count - 1; i >= 0; i--) { - free_irq(gpio_to_irq(ai->gpio[i]), as); -err_request_irq_failed: -err_get_irq_num_failed: -err_gpio_direction_input_failed: - gpio_free(ai->gpio[i]); -err_request_gpio_failed: - ; - } - kfree(as); - *data = NULL; -err_alloc_axis_state_failed: - return ret; -} |