eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 1 | /* |
Grant Likely | c103de2 | 2011-06-04 18:38:28 -0600 | [diff] [blame] | 2 | * PCA953x 4/8/16 bit I/O ports |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> |
| 5 | * Copyright (C) 2007 Marvell International Ltd. |
| 6 | * |
| 7 | * Derived from drivers/i2c/chips/pca9539.c |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; version 2 of the License. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
H Hartley Sweeten | d120c17 | 2009-09-22 16:46:37 -0700 | [diff] [blame] | 16 | #include <linux/gpio.h> |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/irq.h> |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 19 | #include <linux/i2c.h> |
Guennadi Liakhovetski | d1c057e3 | 2008-02-06 01:39:02 -0800 | [diff] [blame] | 20 | #include <linux/i2c/pca953x.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 22 | #ifdef CONFIG_OF_GPIO |
| 23 | #include <linux/of_platform.h> |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 24 | #endif |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 25 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 26 | #define PCA953X_INPUT 0 |
| 27 | #define PCA953X_OUTPUT 1 |
| 28 | #define PCA953X_INVERT 2 |
| 29 | #define PCA953X_DIRECTION 3 |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 30 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 31 | #define PCA957X_IN 0 |
| 32 | #define PCA957X_INVRT 1 |
| 33 | #define PCA957X_BKEN 2 |
| 34 | #define PCA957X_PUPD 3 |
| 35 | #define PCA957X_CFG 4 |
| 36 | #define PCA957X_OUT 5 |
| 37 | #define PCA957X_MSK 6 |
| 38 | #define PCA957X_INTS 7 |
| 39 | |
| 40 | #define PCA_GPIO_MASK 0x00FF |
| 41 | #define PCA_INT 0x0100 |
| 42 | #define PCA953X_TYPE 0x1000 |
| 43 | #define PCA957X_TYPE 0x2000 |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 44 | |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 45 | static const struct i2c_device_id pca953x_id[] = { |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 46 | { "pca9534", 8 | PCA953X_TYPE | PCA_INT, }, |
| 47 | { "pca9535", 16 | PCA953X_TYPE | PCA_INT, }, |
| 48 | { "pca9536", 4 | PCA953X_TYPE, }, |
| 49 | { "pca9537", 4 | PCA953X_TYPE | PCA_INT, }, |
| 50 | { "pca9538", 8 | PCA953X_TYPE | PCA_INT, }, |
| 51 | { "pca9539", 16 | PCA953X_TYPE | PCA_INT, }, |
| 52 | { "pca9554", 8 | PCA953X_TYPE | PCA_INT, }, |
| 53 | { "pca9555", 16 | PCA953X_TYPE | PCA_INT, }, |
| 54 | { "pca9556", 8 | PCA953X_TYPE, }, |
| 55 | { "pca9557", 8 | PCA953X_TYPE, }, |
| 56 | { "pca9574", 8 | PCA957X_TYPE | PCA_INT, }, |
| 57 | { "pca9575", 16 | PCA957X_TYPE | PCA_INT, }, |
David Brownell | ab5dc37 | 2009-01-06 14:42:27 -0800 | [diff] [blame] | 58 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 59 | { "max7310", 8 | PCA953X_TYPE, }, |
| 60 | { "max7312", 16 | PCA953X_TYPE | PCA_INT, }, |
| 61 | { "max7313", 16 | PCA953X_TYPE | PCA_INT, }, |
| 62 | { "max7315", 8 | PCA953X_TYPE | PCA_INT, }, |
| 63 | { "pca6107", 8 | PCA953X_TYPE | PCA_INT, }, |
| 64 | { "tca6408", 8 | PCA953X_TYPE | PCA_INT, }, |
| 65 | { "tca6416", 16 | PCA953X_TYPE | PCA_INT, }, |
David Brownell | ab5dc37 | 2009-01-06 14:42:27 -0800 | [diff] [blame] | 66 | /* NYET: { "tca6424", 24, }, */ |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 67 | { } |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 68 | }; |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 69 | MODULE_DEVICE_TABLE(i2c, pca953x_id); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 70 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 71 | struct pca953x_chip { |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 72 | unsigned gpio_start; |
| 73 | uint16_t reg_output; |
| 74 | uint16_t reg_direction; |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 75 | struct mutex i2c_lock; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 76 | |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 77 | #ifdef CONFIG_GPIO_PCA953X_IRQ |
| 78 | struct mutex irq_lock; |
| 79 | uint16_t irq_mask; |
| 80 | uint16_t irq_stat; |
| 81 | uint16_t irq_trig_raise; |
| 82 | uint16_t irq_trig_fall; |
| 83 | int irq_base; |
| 84 | #endif |
| 85 | |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 86 | struct i2c_client *client; |
| 87 | struct gpio_chip gpio_chip; |
Uwe Kleine-König | 6215499 | 2010-05-26 14:42:17 -0700 | [diff] [blame] | 88 | const char *const *names; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 89 | int chip_type; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 90 | }; |
| 91 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 92 | static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 93 | { |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 94 | int ret = 0; |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 95 | |
| 96 | if (chip->gpio_chip.ngpio <= 8) |
| 97 | ret = i2c_smbus_write_byte_data(chip->client, reg, val); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 98 | else { |
| 99 | switch (chip->chip_type) { |
| 100 | case PCA953X_TYPE: |
| 101 | ret = i2c_smbus_write_word_data(chip->client, |
| 102 | reg << 1, val); |
| 103 | break; |
| 104 | case PCA957X_TYPE: |
| 105 | ret = i2c_smbus_write_byte_data(chip->client, reg << 1, |
| 106 | val & 0xff); |
| 107 | if (ret < 0) |
| 108 | break; |
| 109 | ret = i2c_smbus_write_byte_data(chip->client, |
| 110 | (reg << 1) + 1, |
| 111 | (val & 0xff00) >> 8); |
| 112 | break; |
| 113 | } |
| 114 | } |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 115 | |
| 116 | if (ret < 0) { |
| 117 | dev_err(&chip->client->dev, "failed writing register\n"); |
David Brownell | ab5dc37 | 2009-01-06 14:42:27 -0800 | [diff] [blame] | 118 | return ret; |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | return 0; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 122 | } |
| 123 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 124 | static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 125 | { |
| 126 | int ret; |
| 127 | |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 128 | if (chip->gpio_chip.ngpio <= 8) |
| 129 | ret = i2c_smbus_read_byte_data(chip->client, reg); |
| 130 | else |
| 131 | ret = i2c_smbus_read_word_data(chip->client, reg << 1); |
| 132 | |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 133 | if (ret < 0) { |
| 134 | dev_err(&chip->client->dev, "failed reading register\n"); |
David Brownell | ab5dc37 | 2009-01-06 14:42:27 -0800 | [diff] [blame] | 135 | return ret; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | *val = (uint16_t)ret; |
| 139 | return 0; |
| 140 | } |
| 141 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 142 | static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 143 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 144 | struct pca953x_chip *chip; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 145 | uint16_t reg_val; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 146 | int ret, offset = 0; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 147 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 148 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 149 | |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 150 | mutex_lock(&chip->i2c_lock); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 151 | reg_val = chip->reg_direction | (1u << off); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 152 | |
| 153 | switch (chip->chip_type) { |
| 154 | case PCA953X_TYPE: |
| 155 | offset = PCA953X_DIRECTION; |
| 156 | break; |
| 157 | case PCA957X_TYPE: |
| 158 | offset = PCA957X_CFG; |
| 159 | break; |
| 160 | } |
| 161 | ret = pca953x_write_reg(chip, offset, reg_val); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 162 | if (ret) |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 163 | goto exit; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 164 | |
| 165 | chip->reg_direction = reg_val; |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 166 | ret = 0; |
| 167 | exit: |
| 168 | mutex_unlock(&chip->i2c_lock); |
| 169 | return ret; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 170 | } |
| 171 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 172 | static int pca953x_gpio_direction_output(struct gpio_chip *gc, |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 173 | unsigned off, int val) |
| 174 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 175 | struct pca953x_chip *chip; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 176 | uint16_t reg_val; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 177 | int ret, offset = 0; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 178 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 179 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 180 | |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 181 | mutex_lock(&chip->i2c_lock); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 182 | /* set output level */ |
| 183 | if (val) |
| 184 | reg_val = chip->reg_output | (1u << off); |
| 185 | else |
| 186 | reg_val = chip->reg_output & ~(1u << off); |
| 187 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 188 | switch (chip->chip_type) { |
| 189 | case PCA953X_TYPE: |
| 190 | offset = PCA953X_OUTPUT; |
| 191 | break; |
| 192 | case PCA957X_TYPE: |
| 193 | offset = PCA957X_OUT; |
| 194 | break; |
| 195 | } |
| 196 | ret = pca953x_write_reg(chip, offset, reg_val); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 197 | if (ret) |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 198 | goto exit; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 199 | |
| 200 | chip->reg_output = reg_val; |
| 201 | |
| 202 | /* then direction */ |
| 203 | reg_val = chip->reg_direction & ~(1u << off); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 204 | switch (chip->chip_type) { |
| 205 | case PCA953X_TYPE: |
| 206 | offset = PCA953X_DIRECTION; |
| 207 | break; |
| 208 | case PCA957X_TYPE: |
| 209 | offset = PCA957X_CFG; |
| 210 | break; |
| 211 | } |
| 212 | ret = pca953x_write_reg(chip, offset, reg_val); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 213 | if (ret) |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 214 | goto exit; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 215 | |
| 216 | chip->reg_direction = reg_val; |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 217 | ret = 0; |
| 218 | exit: |
| 219 | mutex_unlock(&chip->i2c_lock); |
| 220 | return ret; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 221 | } |
| 222 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 223 | static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 224 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 225 | struct pca953x_chip *chip; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 226 | uint16_t reg_val; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 227 | int ret, offset = 0; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 228 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 229 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 230 | |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 231 | mutex_lock(&chip->i2c_lock); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 232 | switch (chip->chip_type) { |
| 233 | case PCA953X_TYPE: |
| 234 | offset = PCA953X_INPUT; |
| 235 | break; |
| 236 | case PCA957X_TYPE: |
| 237 | offset = PCA957X_IN; |
| 238 | break; |
| 239 | } |
| 240 | ret = pca953x_read_reg(chip, offset, ®_val); |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 241 | mutex_unlock(&chip->i2c_lock); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 242 | if (ret < 0) { |
| 243 | /* NOTE: diagnostic already emitted; that's all we should |
| 244 | * do unless gpio_*_value_cansleep() calls become different |
| 245 | * from their nonsleeping siblings (and report faults). |
| 246 | */ |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | return (reg_val & (1u << off)) ? 1 : 0; |
| 251 | } |
| 252 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 253 | static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 254 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 255 | struct pca953x_chip *chip; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 256 | uint16_t reg_val; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 257 | int ret, offset = 0; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 258 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 259 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 260 | |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 261 | mutex_lock(&chip->i2c_lock); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 262 | if (val) |
| 263 | reg_val = chip->reg_output | (1u << off); |
| 264 | else |
| 265 | reg_val = chip->reg_output & ~(1u << off); |
| 266 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 267 | switch (chip->chip_type) { |
| 268 | case PCA953X_TYPE: |
| 269 | offset = PCA953X_OUTPUT; |
| 270 | break; |
| 271 | case PCA957X_TYPE: |
| 272 | offset = PCA957X_OUT; |
| 273 | break; |
| 274 | } |
| 275 | ret = pca953x_write_reg(chip, offset, reg_val); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 276 | if (ret) |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 277 | goto exit; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 278 | |
| 279 | chip->reg_output = reg_val; |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 280 | exit: |
| 281 | mutex_unlock(&chip->i2c_lock); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 282 | } |
| 283 | |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 284 | static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 285 | { |
| 286 | struct gpio_chip *gc; |
| 287 | |
| 288 | gc = &chip->gpio_chip; |
| 289 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 290 | gc->direction_input = pca953x_gpio_direction_input; |
| 291 | gc->direction_output = pca953x_gpio_direction_output; |
| 292 | gc->get = pca953x_gpio_get_value; |
| 293 | gc->set = pca953x_gpio_set_value; |
Arnaud Patard | 8420780 | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 294 | gc->can_sleep = 1; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 295 | |
| 296 | gc->base = chip->gpio_start; |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 297 | gc->ngpio = gpios; |
| 298 | gc->label = chip->client->name; |
David Brownell | d8f388d | 2008-07-25 01:46:07 -0700 | [diff] [blame] | 299 | gc->dev = &chip->client->dev; |
Guennadi Liakhovetski | d72cbed | 2008-04-28 02:14:45 -0700 | [diff] [blame] | 300 | gc->owner = THIS_MODULE; |
Daniel Silverstone | 77906a54 | 2009-06-17 16:26:15 -0700 | [diff] [blame] | 301 | gc->names = chip->names; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 302 | } |
| 303 | |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 304 | #ifdef CONFIG_GPIO_PCA953X_IRQ |
| 305 | static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off) |
| 306 | { |
| 307 | struct pca953x_chip *chip; |
| 308 | |
| 309 | chip = container_of(gc, struct pca953x_chip, gpio_chip); |
| 310 | return chip->irq_base + off; |
| 311 | } |
| 312 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 313 | static void pca953x_irq_mask(struct irq_data *d) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 314 | { |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 315 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 316 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 317 | chip->irq_mask &= ~(1 << (d->irq - chip->irq_base)); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 318 | } |
| 319 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 320 | static void pca953x_irq_unmask(struct irq_data *d) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 321 | { |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 322 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 323 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 324 | chip->irq_mask |= 1 << (d->irq - chip->irq_base); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 325 | } |
| 326 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 327 | static void pca953x_irq_bus_lock(struct irq_data *d) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 328 | { |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 329 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 330 | |
| 331 | mutex_lock(&chip->irq_lock); |
| 332 | } |
| 333 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 334 | static void pca953x_irq_bus_sync_unlock(struct irq_data *d) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 335 | { |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 336 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
Marc Zyngier | a2cb9ae | 2010-04-27 13:13:07 -0700 | [diff] [blame] | 337 | uint16_t new_irqs; |
| 338 | uint16_t level; |
| 339 | |
| 340 | /* Look for any newly setup interrupt */ |
| 341 | new_irqs = chip->irq_trig_fall | chip->irq_trig_raise; |
| 342 | new_irqs &= ~chip->reg_direction; |
| 343 | |
| 344 | while (new_irqs) { |
| 345 | level = __ffs(new_irqs); |
| 346 | pca953x_gpio_direction_input(&chip->gpio_chip, level); |
| 347 | new_irqs &= ~(1 << level); |
| 348 | } |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 349 | |
| 350 | mutex_unlock(&chip->irq_lock); |
| 351 | } |
| 352 | |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 353 | static int pca953x_irq_set_type(struct irq_data *d, unsigned int type) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 354 | { |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 355 | struct pca953x_chip *chip = irq_data_get_irq_chip_data(d); |
| 356 | uint16_t level = d->irq - chip->irq_base; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 357 | uint16_t mask = 1 << level; |
| 358 | |
| 359 | if (!(type & IRQ_TYPE_EDGE_BOTH)) { |
| 360 | dev_err(&chip->client->dev, "irq %d: unsupported type %d\n", |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 361 | d->irq, type); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 362 | return -EINVAL; |
| 363 | } |
| 364 | |
| 365 | if (type & IRQ_TYPE_EDGE_FALLING) |
| 366 | chip->irq_trig_fall |= mask; |
| 367 | else |
| 368 | chip->irq_trig_fall &= ~mask; |
| 369 | |
| 370 | if (type & IRQ_TYPE_EDGE_RISING) |
| 371 | chip->irq_trig_raise |= mask; |
| 372 | else |
| 373 | chip->irq_trig_raise &= ~mask; |
| 374 | |
Marc Zyngier | a2cb9ae | 2010-04-27 13:13:07 -0700 | [diff] [blame] | 375 | return 0; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | static struct irq_chip pca953x_irq_chip = { |
| 379 | .name = "pca953x", |
Lennert Buytenhek | 6f5cfc0 | 2011-01-12 17:00:15 -0800 | [diff] [blame] | 380 | .irq_mask = pca953x_irq_mask, |
| 381 | .irq_unmask = pca953x_irq_unmask, |
| 382 | .irq_bus_lock = pca953x_irq_bus_lock, |
| 383 | .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock, |
| 384 | .irq_set_type = pca953x_irq_set_type, |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 385 | }; |
| 386 | |
| 387 | static uint16_t pca953x_irq_pending(struct pca953x_chip *chip) |
| 388 | { |
| 389 | uint16_t cur_stat; |
| 390 | uint16_t old_stat; |
| 391 | uint16_t pending; |
| 392 | uint16_t trigger; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 393 | int ret, offset = 0; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 394 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 395 | switch (chip->chip_type) { |
| 396 | case PCA953X_TYPE: |
| 397 | offset = PCA953X_INPUT; |
| 398 | break; |
| 399 | case PCA957X_TYPE: |
| 400 | offset = PCA957X_IN; |
| 401 | break; |
| 402 | } |
| 403 | ret = pca953x_read_reg(chip, offset, &cur_stat); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 404 | if (ret) |
| 405 | return 0; |
| 406 | |
| 407 | /* Remove output pins from the equation */ |
| 408 | cur_stat &= chip->reg_direction; |
| 409 | |
| 410 | old_stat = chip->irq_stat; |
| 411 | trigger = (cur_stat ^ old_stat) & chip->irq_mask; |
| 412 | |
| 413 | if (!trigger) |
| 414 | return 0; |
| 415 | |
| 416 | chip->irq_stat = cur_stat; |
| 417 | |
| 418 | pending = (old_stat & chip->irq_trig_fall) | |
| 419 | (cur_stat & chip->irq_trig_raise); |
| 420 | pending &= trigger; |
| 421 | |
| 422 | return pending; |
| 423 | } |
| 424 | |
| 425 | static irqreturn_t pca953x_irq_handler(int irq, void *devid) |
| 426 | { |
| 427 | struct pca953x_chip *chip = devid; |
| 428 | uint16_t pending; |
| 429 | uint16_t level; |
| 430 | |
| 431 | pending = pca953x_irq_pending(chip); |
| 432 | |
| 433 | if (!pending) |
| 434 | return IRQ_HANDLED; |
| 435 | |
| 436 | do { |
| 437 | level = __ffs(pending); |
David Jander | 6dd599f | 2011-06-08 11:37:45 -0600 | [diff] [blame] | 438 | handle_nested_irq(level + chip->irq_base); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 439 | |
| 440 | pending &= ~(1 << level); |
| 441 | } while (pending); |
| 442 | |
| 443 | return IRQ_HANDLED; |
| 444 | } |
| 445 | |
| 446 | static int pca953x_irq_setup(struct pca953x_chip *chip, |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 447 | const struct i2c_device_id *id, |
| 448 | int irq_base) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 449 | { |
| 450 | struct i2c_client *client = chip->client; |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 451 | int ret, offset = 0; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 452 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 453 | if (irq_base != -1 |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 454 | && (id->driver_data & PCA_INT)) { |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 455 | int lvl; |
| 456 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 457 | switch (chip->chip_type) { |
| 458 | case PCA953X_TYPE: |
| 459 | offset = PCA953X_INPUT; |
| 460 | break; |
| 461 | case PCA957X_TYPE: |
| 462 | offset = PCA957X_IN; |
| 463 | break; |
| 464 | } |
| 465 | ret = pca953x_read_reg(chip, offset, &chip->irq_stat); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 466 | if (ret) |
| 467 | goto out_failed; |
| 468 | |
| 469 | /* |
| 470 | * There is no way to know which GPIO line generated the |
| 471 | * interrupt. We have to rely on the previous read for |
| 472 | * this purpose. |
| 473 | */ |
| 474 | chip->irq_stat &= chip->reg_direction; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 475 | mutex_init(&chip->irq_lock); |
| 476 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 477 | chip->irq_base = irq_alloc_descs(-1, irq_base, chip->gpio_chip.ngpio, -1); |
David Jander | 910c8fb | 2011-06-08 11:34:37 -0600 | [diff] [blame] | 478 | if (chip->irq_base < 0) |
| 479 | goto out_failed; |
| 480 | |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 481 | for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) { |
| 482 | int irq = lvl + chip->irq_base; |
| 483 | |
David Jander | 910c8fb | 2011-06-08 11:34:37 -0600 | [diff] [blame] | 484 | irq_clear_status_flags(irq, IRQ_NOREQUEST); |
Thomas Gleixner | b51804b | 2011-03-24 21:27:36 +0000 | [diff] [blame] | 485 | irq_set_chip_data(irq, chip); |
David Jander | 6dd599f | 2011-06-08 11:37:45 -0600 | [diff] [blame] | 486 | irq_set_chip(irq, &pca953x_irq_chip); |
| 487 | irq_set_nested_thread(irq, true); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 488 | #ifdef CONFIG_ARM |
| 489 | set_irq_flags(irq, IRQF_VALID); |
| 490 | #else |
Thomas Gleixner | b51804b | 2011-03-24 21:27:36 +0000 | [diff] [blame] | 491 | irq_set_noprobe(irq); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 492 | #endif |
| 493 | } |
| 494 | |
| 495 | ret = request_threaded_irq(client->irq, |
| 496 | NULL, |
| 497 | pca953x_irq_handler, |
David Jander | 17e8b42 | 2011-06-08 11:34:41 -0600 | [diff] [blame] | 498 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 499 | dev_name(&client->dev), chip); |
| 500 | if (ret) { |
| 501 | dev_err(&client->dev, "failed to request irq %d\n", |
| 502 | client->irq); |
| 503 | goto out_failed; |
| 504 | } |
| 505 | |
| 506 | chip->gpio_chip.to_irq = pca953x_gpio_to_irq; |
| 507 | } |
| 508 | |
| 509 | return 0; |
| 510 | |
| 511 | out_failed: |
Alek Du | 8a233f01 | 2010-10-26 14:22:41 -0700 | [diff] [blame] | 512 | chip->irq_base = -1; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | static void pca953x_irq_teardown(struct pca953x_chip *chip) |
| 517 | { |
David Jander | c609c05 | 2011-06-14 11:00:54 +0200 | [diff] [blame] | 518 | if (chip->irq_base != -1) { |
| 519 | irq_free_descs(chip->irq_base, chip->gpio_chip.ngpio); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 520 | free_irq(chip->client->irq, chip); |
David Jander | c609c05 | 2011-06-14 11:00:54 +0200 | [diff] [blame] | 521 | } |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 522 | } |
| 523 | #else /* CONFIG_GPIO_PCA953X_IRQ */ |
| 524 | static int pca953x_irq_setup(struct pca953x_chip *chip, |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 525 | const struct i2c_device_id *id, |
| 526 | int irq_base) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 527 | { |
| 528 | struct i2c_client *client = chip->client; |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 529 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 530 | if (irq_base != -1 && (id->driver_data & PCA_INT)) |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 531 | dev_warn(&client->dev, "interrupt support not compiled in\n"); |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static void pca953x_irq_teardown(struct pca953x_chip *chip) |
| 537 | { |
| 538 | } |
| 539 | #endif |
| 540 | |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 541 | /* |
| 542 | * Handlers for alternative sources of platform_data |
| 543 | */ |
| 544 | #ifdef CONFIG_OF_GPIO |
| 545 | /* |
| 546 | * Translate OpenFirmware node properties into platform_data |
David Jander | a57339b | 2011-06-14 11:00:56 +0200 | [diff] [blame] | 547 | * WARNING: This is DEPRECATED and will be removed eventually! |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 548 | */ |
Mark Brown | 404ba2b | 2011-11-21 17:57:25 +0000 | [diff] [blame] | 549 | static void |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 550 | pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, int *invert) |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 551 | { |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 552 | struct device_node *node; |
Dirk Eibach | 1648237 | 2011-02-24 10:20:43 +0100 | [diff] [blame] | 553 | const __be32 *val; |
| 554 | int size; |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 555 | |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 556 | node = client->dev.of_node; |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 557 | if (node == NULL) |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 558 | return; |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 559 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 560 | *gpio_base = -1; |
Dirk Eibach | 1648237 | 2011-02-24 10:20:43 +0100 | [diff] [blame] | 561 | val = of_get_property(node, "linux,gpio-base", &size); |
David Jander | a57339b | 2011-06-14 11:00:56 +0200 | [diff] [blame] | 562 | WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__); |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 563 | if (val) { |
Dirk Eibach | 1648237 | 2011-02-24 10:20:43 +0100 | [diff] [blame] | 564 | if (size != sizeof(*val)) |
| 565 | dev_warn(&client->dev, "%s: wrong linux,gpio-base\n", |
| 566 | node->full_name); |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 567 | else |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 568 | *gpio_base = be32_to_cpup(val); |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | val = of_get_property(node, "polarity", NULL); |
David Jander | a57339b | 2011-06-14 11:00:56 +0200 | [diff] [blame] | 572 | WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__); |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 573 | if (val) |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 574 | *invert = *val; |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 575 | } |
| 576 | #else |
Mark Brown | 404ba2b | 2011-11-21 17:57:25 +0000 | [diff] [blame] | 577 | static void |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 578 | pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, int *invert) |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 579 | { |
Hartmut Knaack | 25fcf2b | 2011-10-11 00:22:45 +0200 | [diff] [blame] | 580 | *gpio_base = -1; |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 581 | } |
| 582 | #endif |
| 583 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 584 | static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert) |
| 585 | { |
| 586 | int ret; |
| 587 | |
| 588 | ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output); |
| 589 | if (ret) |
| 590 | goto out; |
| 591 | |
| 592 | ret = pca953x_read_reg(chip, PCA953X_DIRECTION, |
| 593 | &chip->reg_direction); |
| 594 | if (ret) |
| 595 | goto out; |
| 596 | |
| 597 | /* set platform specific polarity inversion */ |
| 598 | ret = pca953x_write_reg(chip, PCA953X_INVERT, invert); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 599 | out: |
| 600 | return ret; |
| 601 | } |
| 602 | |
| 603 | static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert) |
| 604 | { |
| 605 | int ret; |
| 606 | uint16_t val = 0; |
| 607 | |
| 608 | /* Let every port in proper state, that could save power */ |
| 609 | pca953x_write_reg(chip, PCA957X_PUPD, 0x0); |
| 610 | pca953x_write_reg(chip, PCA957X_CFG, 0xffff); |
| 611 | pca953x_write_reg(chip, PCA957X_OUT, 0x0); |
| 612 | |
| 613 | ret = pca953x_read_reg(chip, PCA957X_IN, &val); |
| 614 | if (ret) |
| 615 | goto out; |
| 616 | ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output); |
| 617 | if (ret) |
| 618 | goto out; |
| 619 | ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction); |
| 620 | if (ret) |
| 621 | goto out; |
| 622 | |
| 623 | /* set platform specific polarity inversion */ |
| 624 | pca953x_write_reg(chip, PCA957X_INVRT, invert); |
| 625 | |
| 626 | /* To enable register 6, 7 to controll pull up and pull down */ |
| 627 | pca953x_write_reg(chip, PCA957X_BKEN, 0x202); |
| 628 | |
| 629 | return 0; |
| 630 | out: |
| 631 | return ret; |
| 632 | } |
| 633 | |
Jean Delvare | d2653e9 | 2008-04-29 23:11:39 +0200 | [diff] [blame] | 634 | static int __devinit pca953x_probe(struct i2c_client *client, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 635 | const struct i2c_device_id *id) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 636 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 637 | struct pca953x_platform_data *pdata; |
| 638 | struct pca953x_chip *chip; |
David Jander | a57339b | 2011-06-14 11:00:56 +0200 | [diff] [blame] | 639 | int irq_base=0, invert=0; |
Wolfram Sang | 7ea2aa2 | 2011-10-14 15:32:00 +0200 | [diff] [blame] | 640 | int ret; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 641 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 642 | chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 643 | if (chip == NULL) |
| 644 | return -ENOMEM; |
| 645 | |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 646 | pdata = client->dev.platform_data; |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 647 | if (pdata) { |
| 648 | irq_base = pdata->irq_base; |
| 649 | chip->gpio_start = pdata->gpio_base; |
| 650 | invert = pdata->invert; |
| 651 | chip->names = pdata->names; |
| 652 | } else { |
| 653 | pca953x_get_alt_pdata(client, &chip->gpio_start, &invert); |
David Jander | a57339b | 2011-06-14 11:00:56 +0200 | [diff] [blame] | 654 | #ifdef CONFIG_OF_GPIO |
| 655 | /* If I2C node has no interrupts property, disable GPIO interrupts */ |
| 656 | if (of_find_property(client->dev.of_node, "interrupts", NULL) == NULL) |
| 657 | irq_base = -1; |
| 658 | #endif |
Nate Case | 1965d30 | 2009-06-17 16:26:17 -0700 | [diff] [blame] | 659 | } |
| 660 | |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 661 | chip->client = client; |
| 662 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 663 | chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE); |
Daniel Silverstone | 77906a54 | 2009-06-17 16:26:15 -0700 | [diff] [blame] | 664 | |
Roland Stigge | 6e20fb1 | 2011-02-10 15:01:23 -0800 | [diff] [blame] | 665 | mutex_init(&chip->i2c_lock); |
| 666 | |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 667 | /* initialize cached registers from their original values. |
| 668 | * we can't share this chip with another i2c master. |
| 669 | */ |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 670 | pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK); |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 671 | |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 672 | if (chip->chip_type == PCA953X_TYPE) |
Wolfram Sang | 7ea2aa2 | 2011-10-14 15:32:00 +0200 | [diff] [blame] | 673 | ret = device_pca953x_init(chip, invert); |
Haojian Zhuang | 33226ff | 2011-04-18 22:12:46 +0800 | [diff] [blame] | 674 | else |
Wolfram Sang | 7ea2aa2 | 2011-10-14 15:32:00 +0200 | [diff] [blame] | 675 | ret = device_pca957x_init(chip, invert); |
| 676 | if (ret) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 677 | goto out_failed; |
| 678 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 679 | ret = pca953x_irq_setup(chip, id, irq_base); |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 680 | if (ret) |
| 681 | goto out_failed; |
Guennadi Liakhovetski | f5e8ff4 | 2008-02-06 01:39:04 -0800 | [diff] [blame] | 682 | |
| 683 | ret = gpiochip_add(&chip->gpio_chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 684 | if (ret) |
Ben Dooks | 272df50 | 2011-03-31 07:18:46 +0900 | [diff] [blame] | 685 | goto out_failed_irq; |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 686 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 687 | if (pdata && pdata->setup) { |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 688 | ret = pdata->setup(client, chip->gpio_chip.base, |
| 689 | chip->gpio_chip.ngpio, pdata->context); |
| 690 | if (ret < 0) |
| 691 | dev_warn(&client->dev, "setup failed, %d\n", ret); |
| 692 | } |
| 693 | |
| 694 | i2c_set_clientdata(client, chip); |
| 695 | return 0; |
| 696 | |
Ben Dooks | 272df50 | 2011-03-31 07:18:46 +0900 | [diff] [blame] | 697 | out_failed_irq: |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 698 | pca953x_irq_teardown(chip); |
Ben Dooks | 272df50 | 2011-03-31 07:18:46 +0900 | [diff] [blame] | 699 | out_failed: |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 700 | kfree(chip); |
| 701 | return ret; |
| 702 | } |
| 703 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 704 | static int pca953x_remove(struct i2c_client *client) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 705 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 706 | struct pca953x_platform_data *pdata = client->dev.platform_data; |
| 707 | struct pca953x_chip *chip = i2c_get_clientdata(client); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 708 | int ret = 0; |
| 709 | |
David Jander | c6dcf59 | 2011-06-14 11:00:55 +0200 | [diff] [blame] | 710 | if (pdata && pdata->teardown) { |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 711 | ret = pdata->teardown(client, chip->gpio_chip.base, |
| 712 | chip->gpio_chip.ngpio, pdata->context); |
| 713 | if (ret < 0) { |
| 714 | dev_err(&client->dev, "%s failed, %d\n", |
| 715 | "teardown", ret); |
| 716 | return ret; |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | ret = gpiochip_remove(&chip->gpio_chip); |
| 721 | if (ret) { |
| 722 | dev_err(&client->dev, "%s failed, %d\n", |
| 723 | "gpiochip_remove()", ret); |
| 724 | return ret; |
| 725 | } |
| 726 | |
Marc Zyngier | 89ea8bb | 2010-03-05 13:44:36 -0800 | [diff] [blame] | 727 | pca953x_irq_teardown(chip); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 728 | kfree(chip); |
| 729 | return 0; |
| 730 | } |
| 731 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 732 | static struct i2c_driver pca953x_driver = { |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 733 | .driver = { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 734 | .name = "pca953x", |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 735 | }, |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 736 | .probe = pca953x_probe, |
| 737 | .remove = pca953x_remove, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 738 | .id_table = pca953x_id, |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 739 | }; |
| 740 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 741 | static int __init pca953x_init(void) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 742 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 743 | return i2c_add_driver(&pca953x_driver); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 744 | } |
David Brownell | 2f8d119 | 2008-10-15 22:03:13 -0700 | [diff] [blame] | 745 | /* register after i2c postcore initcall and before |
| 746 | * subsys initcalls that may rely on these GPIOs |
| 747 | */ |
| 748 | subsys_initcall(pca953x_init); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 749 | |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 750 | static void __exit pca953x_exit(void) |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 751 | { |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 752 | i2c_del_driver(&pca953x_driver); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 753 | } |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 754 | module_exit(pca953x_exit); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 755 | |
| 756 | MODULE_AUTHOR("eric miao <eric.miao@marvell.com>"); |
Guennadi Liakhovetski | f3dc363 | 2008-02-06 01:39:03 -0800 | [diff] [blame] | 757 | MODULE_DESCRIPTION("GPIO expander driver for PCA953x"); |
eric miao | 9e60fdc | 2008-02-04 22:28:26 -0800 | [diff] [blame] | 758 | MODULE_LICENSE("GPL"); |