1 /* 2 * Core driver for TPS61050/61052 boost converters, used for while LED 3 * driving, audio power amplification, white LED flash, and generic 4 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in) 5 * and a flash synchronization pin to synchronize flash events when used as 6 * flashgun. 7 * 8 * Copyright (C) 2011 ST-Ericsson SA 9 * Written on behalf of Linaro for ST-Ericsson 10 * 11 * Author: Linus Walleij <linus.walleij@linaro.org> 12 * 13 * License terms: GNU General Public License (GPL) version 2 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/i2c.h> 19 #include <linux/mutex.h> 20 #include <linux/gpio.h> 21 #include <linux/spinlock.h> 22 #include <linux/slab.h> 23 #include <linux/err.h> 24 #include <linux/regulator/driver.h> 25 #include <linux/mfd/core.h> 26 #include <linux/mfd/tps6105x.h> 27 28 int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value) 29 { 30 int ret; 31 32 ret = mutex_lock_interruptible(&tps6105x->lock); 33 if (ret) 34 return ret; 35 ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value); 36 mutex_unlock(&tps6105x->lock); 37 if (ret < 0) 38 return ret; 39 40 return 0; 41 } 42 EXPORT_SYMBOL(tps6105x_set); 43 44 int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf) 45 { 46 int ret; 47 48 ret = mutex_lock_interruptible(&tps6105x->lock); 49 if (ret) 50 return ret; 51 ret = i2c_smbus_read_byte_data(tps6105x->client, reg); 52 mutex_unlock(&tps6105x->lock); 53 if (ret < 0) 54 return ret; 55 56 *buf = ret; 57 return 0; 58 } 59 EXPORT_SYMBOL(tps6105x_get); 60 61 /* 62 * Masks off the bits in the mask and sets the bits in the bitvalues 63 * parameter in one atomic operation 64 */ 65 int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg, 66 u8 bitmask, u8 bitvalues) 67 { 68 int ret; 69 u8 regval; 70 71 ret = mutex_lock_interruptible(&tps6105x->lock); 72 if (ret) 73 return ret; 74 ret = i2c_smbus_read_byte_data(tps6105x->client, reg); 75 if (ret < 0) 76 goto fail; 77 regval = ret; 78 regval = (~bitmask & regval) | (bitmask & bitvalues); 79 ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval); 80 fail: 81 mutex_unlock(&tps6105x->lock); 82 if (ret < 0) 83 return ret; 84 85 return 0; 86 } 87 EXPORT_SYMBOL(tps6105x_mask_and_set); 88 89 static int tps6105x_startup(struct tps6105x *tps6105x) 90 { 91 int ret; 92 u8 regval; 93 94 ret = tps6105x_get(tps6105x, TPS6105X_REG_0, ®val); 95 if (ret) 96 return ret; 97 switch (regval >> TPS6105X_REG0_MODE_SHIFT) { 98 case TPS6105X_REG0_MODE_SHUTDOWN: 99 dev_info(&tps6105x->client->dev, 100 "TPS6105x found in SHUTDOWN mode\n"); 101 break; 102 case TPS6105X_REG0_MODE_TORCH: 103 dev_info(&tps6105x->client->dev, 104 "TPS6105x found in TORCH mode\n"); 105 break; 106 case TPS6105X_REG0_MODE_TORCH_FLASH: 107 dev_info(&tps6105x->client->dev, 108 "TPS6105x found in FLASH mode\n"); 109 break; 110 case TPS6105X_REG0_MODE_VOLTAGE: 111 dev_info(&tps6105x->client->dev, 112 "TPS6105x found in VOLTAGE mode\n"); 113 break; 114 default: 115 break; 116 } 117 118 return ret; 119 } 120 121 /* 122 * MFD cells - we have one cell which is selected operation 123 * mode, and we always have a GPIO cell. 124 */ 125 static struct mfd_cell tps6105x_cells[] = { 126 { 127 /* name will be runtime assigned */ 128 .id = -1, 129 }, 130 { 131 .name = "tps6105x-gpio", 132 .id = -1, 133 }, 134 }; 135 136 static int tps6105x_probe(struct i2c_client *client, 137 const struct i2c_device_id *id) 138 { 139 struct tps6105x *tps6105x; 140 struct tps6105x_platform_data *pdata; 141 int ret; 142 int i; 143 144 tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL); 145 if (!tps6105x) 146 return -ENOMEM; 147 148 i2c_set_clientdata(client, tps6105x); 149 tps6105x->client = client; 150 pdata = client->dev.platform_data; 151 tps6105x->pdata = pdata; 152 mutex_init(&tps6105x->lock); 153 154 ret = tps6105x_startup(tps6105x); 155 if (ret) { 156 dev_err(&client->dev, "chip initialization failed\n"); 157 goto fail; 158 } 159 160 /* Remove warning texts when you implement new cell drivers */ 161 switch (pdata->mode) { 162 case TPS6105X_MODE_SHUTDOWN: 163 dev_info(&client->dev, 164 "present, not used for anything, only GPIO\n"); 165 break; 166 case TPS6105X_MODE_TORCH: 167 tps6105x_cells[0].name = "tps6105x-leds"; 168 dev_warn(&client->dev, 169 "torch mode is unsupported\n"); 170 break; 171 case TPS6105X_MODE_TORCH_FLASH: 172 tps6105x_cells[0].name = "tps6105x-flash"; 173 dev_warn(&client->dev, 174 "flash mode is unsupported\n"); 175 break; 176 case TPS6105X_MODE_VOLTAGE: 177 tps6105x_cells[0].name ="tps6105x-regulator"; 178 break; 179 default: 180 break; 181 } 182 183 /* Set up and register the platform devices. */ 184 for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) { 185 /* One state holder for all drivers, this is simple */ 186 tps6105x_cells[i].platform_data = tps6105x; 187 tps6105x_cells[i].pdata_size = sizeof(*tps6105x); 188 } 189 190 ret = mfd_add_devices(&client->dev, 0, tps6105x_cells, 191 ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL); 192 if (ret) 193 goto fail; 194 195 return 0; 196 197 fail: 198 kfree(tps6105x); 199 return ret; 200 } 201 202 static int tps6105x_remove(struct i2c_client *client) 203 { 204 struct tps6105x *tps6105x = i2c_get_clientdata(client); 205 206 mfd_remove_devices(&client->dev); 207 208 /* Put chip in shutdown mode */ 209 tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0, 210 TPS6105X_REG0_MODE_MASK, 211 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT); 212 213 kfree(tps6105x); 214 return 0; 215 } 216 217 static const struct i2c_device_id tps6105x_id[] = { 218 { "tps61050", 0 }, 219 { "tps61052", 0 }, 220 { } 221 }; 222 MODULE_DEVICE_TABLE(i2c, tps6105x_id); 223 224 static struct i2c_driver tps6105x_driver = { 225 .driver = { 226 .name = "tps6105x", 227 }, 228 .probe = tps6105x_probe, 229 .remove = tps6105x_remove, 230 .id_table = tps6105x_id, 231 }; 232 233 static int __init tps6105x_init(void) 234 { 235 return i2c_add_driver(&tps6105x_driver); 236 } 237 subsys_initcall(tps6105x_init); 238 239 static void __exit tps6105x_exit(void) 240 { 241 i2c_del_driver(&tps6105x_driver); 242 } 243 module_exit(tps6105x_exit); 244 245 MODULE_AUTHOR("Linus Walleij"); 246 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver"); 247 MODULE_LICENSE("GPL v2"); 248