Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 1 | /* |
| 2 | * LCD/Backlight Driver for Sharp Zaurus Handhelds (various models) |
| 3 | * |
| 4 | * Copyright (c) 2004-2006 Richard Purdie |
| 5 | * |
| 6 | * Based on Sharp's 2.4 Backlight Driver |
| 7 | * |
| 8 | * Copyright (c) 2008 Marvell International Ltd. |
| 9 | * Converted to SPI device based LCD/Backlight device driver |
| 10 | * by Eric Miao <eric.miao@marvell.com> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License version 2 as |
| 14 | * published by the Free Software Foundation. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/delay.h> |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 22 | #include <linux/gpio.h> |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 23 | #include <linux/fb.h> |
| 24 | #include <linux/lcd.h> |
| 25 | #include <linux/spi/spi.h> |
| 26 | #include <linux/spi/corgi_lcd.h> |
| 27 | #include <asm/mach/sharpsl_param.h> |
| 28 | |
| 29 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) |
| 30 | |
| 31 | /* Register Addresses */ |
| 32 | #define RESCTL_ADRS 0x00 |
| 33 | #define PHACTRL_ADRS 0x01 |
| 34 | #define DUTYCTRL_ADRS 0x02 |
| 35 | #define POWERREG0_ADRS 0x03 |
| 36 | #define POWERREG1_ADRS 0x04 |
| 37 | #define GPOR3_ADRS 0x05 |
| 38 | #define PICTRL_ADRS 0x06 |
| 39 | #define POLCTRL_ADRS 0x07 |
| 40 | |
| 41 | /* Register Bit Definitions */ |
| 42 | #define RESCTL_QVGA 0x01 |
| 43 | #define RESCTL_VGA 0x00 |
| 44 | |
| 45 | #define POWER1_VW_ON 0x01 /* VW Supply FET ON */ |
| 46 | #define POWER1_GVSS_ON 0x02 /* GVSS(-8V) Power Supply ON */ |
| 47 | #define POWER1_VDD_ON 0x04 /* VDD(8V),SVSS(-4V) Power Supply ON */ |
| 48 | |
| 49 | #define POWER1_VW_OFF 0x00 /* VW Supply FET OFF */ |
| 50 | #define POWER1_GVSS_OFF 0x00 /* GVSS(-8V) Power Supply OFF */ |
| 51 | #define POWER1_VDD_OFF 0x00 /* VDD(8V),SVSS(-4V) Power Supply OFF */ |
| 52 | |
| 53 | #define POWER0_COM_DCLK 0x01 /* COM Voltage DC Bias DAC Serial Data Clock */ |
| 54 | #define POWER0_COM_DOUT 0x02 /* COM Voltage DC Bias DAC Serial Data Out */ |
| 55 | #define POWER0_DAC_ON 0x04 /* DAC Power Supply ON */ |
| 56 | #define POWER0_COM_ON 0x08 /* COM Power Supply ON */ |
| 57 | #define POWER0_VCC5_ON 0x10 /* VCC5 Power Supply ON */ |
| 58 | |
| 59 | #define POWER0_DAC_OFF 0x00 /* DAC Power Supply OFF */ |
| 60 | #define POWER0_COM_OFF 0x00 /* COM Power Supply OFF */ |
| 61 | #define POWER0_VCC5_OFF 0x00 /* VCC5 Power Supply OFF */ |
| 62 | |
| 63 | #define PICTRL_INIT_STATE 0x01 |
| 64 | #define PICTRL_INIOFF 0x02 |
| 65 | #define PICTRL_POWER_DOWN 0x04 |
| 66 | #define PICTRL_COM_SIGNAL_OFF 0x08 |
| 67 | #define PICTRL_DAC_SIGNAL_OFF 0x10 |
| 68 | |
| 69 | #define POLCTRL_SYNC_POL_FALL 0x01 |
| 70 | #define POLCTRL_EN_POL_FALL 0x02 |
| 71 | #define POLCTRL_DATA_POL_FALL 0x04 |
| 72 | #define POLCTRL_SYNC_ACT_H 0x08 |
| 73 | #define POLCTRL_EN_ACT_L 0x10 |
| 74 | |
| 75 | #define POLCTRL_SYNC_POL_RISE 0x00 |
| 76 | #define POLCTRL_EN_POL_RISE 0x00 |
| 77 | #define POLCTRL_DATA_POL_RISE 0x00 |
| 78 | #define POLCTRL_SYNC_ACT_L 0x00 |
| 79 | #define POLCTRL_EN_ACT_H 0x00 |
| 80 | |
| 81 | #define PHACTRL_PHASE_MANUAL 0x01 |
| 82 | #define DEFAULT_PHAD_QVGA (9) |
| 83 | #define DEFAULT_COMADJ (125) |
| 84 | |
| 85 | struct corgi_lcd { |
| 86 | struct spi_device *spi_dev; |
| 87 | struct lcd_device *lcd_dev; |
| 88 | struct backlight_device *bl_dev; |
| 89 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 90 | int limit_mask; |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 91 | int intensity; |
| 92 | int power; |
| 93 | int mode; |
| 94 | char buf[2]; |
| 95 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 96 | int gpio_backlight_on; |
| 97 | int gpio_backlight_cont; |
| 98 | int gpio_backlight_cont_inverted; |
| 99 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 100 | void (*kick_battery)(void); |
| 101 | }; |
| 102 | |
| 103 | static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val); |
| 104 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 105 | static struct corgi_lcd *the_corgi_lcd; |
| 106 | static unsigned long corgibl_flags; |
| 107 | #define CORGIBL_SUSPENDED 0x01 |
| 108 | #define CORGIBL_BATTLOW 0x02 |
| 109 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 110 | /* |
| 111 | * This is only a psuedo I2C interface. We can't use the standard kernel |
| 112 | * routines as the interface is write only. We just assume the data is acked... |
| 113 | */ |
| 114 | static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data) |
| 115 | { |
| 116 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data); |
| 117 | udelay(10); |
| 118 | } |
| 119 | |
| 120 | static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data) |
| 121 | { |
| 122 | lcdtg_ssp_i2c_send(lcd, data); |
| 123 | lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK); |
| 124 | lcdtg_ssp_i2c_send(lcd, data); |
| 125 | } |
| 126 | |
| 127 | static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base) |
| 128 | { |
| 129 | lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT); |
| 130 | lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK); |
| 131 | lcdtg_ssp_i2c_send(lcd, base); |
| 132 | } |
| 133 | |
| 134 | static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base) |
| 135 | { |
| 136 | lcdtg_ssp_i2c_send(lcd, base); |
| 137 | lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK); |
| 138 | lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT); |
| 139 | } |
| 140 | |
| 141 | static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd, |
| 142 | uint8_t base, uint8_t data) |
| 143 | { |
| 144 | int i; |
| 145 | for (i = 0; i < 8; i++) { |
| 146 | if (data & 0x80) |
| 147 | lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT); |
| 148 | else |
| 149 | lcdtg_i2c_send_bit(lcd, base); |
| 150 | data <<= 1; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base) |
| 155 | { |
| 156 | lcdtg_i2c_send_bit(lcd, base); |
| 157 | } |
| 158 | |
| 159 | static void lcdtg_set_common_voltage(struct corgi_lcd *lcd, |
| 160 | uint8_t base_data, uint8_t data) |
| 161 | { |
| 162 | /* Set Common Voltage to M62332FP via I2C */ |
| 163 | lcdtg_i2c_send_start(lcd, base_data); |
| 164 | lcdtg_i2c_send_byte(lcd, base_data, 0x9c); |
| 165 | lcdtg_i2c_wait_ack(lcd, base_data); |
| 166 | lcdtg_i2c_send_byte(lcd, base_data, 0x00); |
| 167 | lcdtg_i2c_wait_ack(lcd, base_data); |
| 168 | lcdtg_i2c_send_byte(lcd, base_data, data); |
| 169 | lcdtg_i2c_wait_ack(lcd, base_data); |
| 170 | lcdtg_i2c_send_stop(lcd, base_data); |
| 171 | } |
| 172 | |
| 173 | static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data) |
| 174 | { |
| 175 | struct spi_message msg; |
| 176 | struct spi_transfer xfer = { |
| 177 | .len = 1, |
| 178 | .cs_change = 1, |
| 179 | .tx_buf = lcd->buf, |
| 180 | }; |
| 181 | |
| 182 | lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); |
| 183 | spi_message_init(&msg); |
| 184 | spi_message_add_tail(&xfer, &msg); |
| 185 | |
| 186 | return spi_sync(lcd->spi_dev, &msg); |
| 187 | } |
| 188 | |
| 189 | /* Set Phase Adjust */ |
| 190 | static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode) |
| 191 | { |
| 192 | int adj; |
| 193 | |
| 194 | switch(mode) { |
| 195 | case CORGI_LCD_MODE_VGA: |
| 196 | /* Setting for VGA */ |
| 197 | adj = sharpsl_param.phadadj; |
| 198 | adj = (adj < 0) ? PHACTRL_PHASE_MANUAL : |
| 199 | PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1); |
| 200 | break; |
| 201 | case CORGI_LCD_MODE_QVGA: |
| 202 | default: |
| 203 | /* Setting for QVGA */ |
| 204 | adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL; |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj); |
| 209 | } |
| 210 | |
| 211 | static void corgi_lcd_power_on(struct corgi_lcd *lcd) |
| 212 | { |
| 213 | int comadj; |
| 214 | |
| 215 | /* Initialize Internal Logic & Port */ |
| 216 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, |
| 217 | PICTRL_POWER_DOWN | PICTRL_INIOFF | |
| 218 | PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF | |
| 219 | PICTRL_DAC_SIGNAL_OFF); |
| 220 | |
| 221 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 222 | POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF | |
| 223 | POWER0_COM_OFF | POWER0_VCC5_OFF); |
| 224 | |
| 225 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 226 | POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF); |
| 227 | |
| 228 | /* VDD(+8V), SVSS(-4V) ON */ |
| 229 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 230 | POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON); |
| 231 | mdelay(3); |
| 232 | |
| 233 | /* DAC ON */ |
| 234 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 235 | POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | |
| 236 | POWER0_COM_OFF | POWER0_VCC5_OFF); |
| 237 | |
| 238 | /* INIB = H, INI = L */ |
| 239 | /* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */ |
| 240 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, |
| 241 | PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF); |
| 242 | |
| 243 | /* Set Common Voltage */ |
| 244 | comadj = sharpsl_param.comadj; |
| 245 | if (comadj < 0) |
| 246 | comadj = DEFAULT_COMADJ; |
| 247 | |
| 248 | lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF | |
| 249 | POWER0_VCC5_OFF, comadj); |
| 250 | |
| 251 | /* VCC5 ON, DAC ON */ |
| 252 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 253 | POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | |
| 254 | POWER0_COM_OFF | POWER0_VCC5_ON); |
| 255 | |
| 256 | /* GVSS(-8V) ON, VDD ON */ |
| 257 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 258 | POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON); |
| 259 | mdelay(2); |
| 260 | |
| 261 | /* COM SIGNAL ON (PICTL[3] = L) */ |
| 262 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE); |
| 263 | |
| 264 | /* COM ON, DAC ON, VCC5_ON */ |
| 265 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 266 | POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON | |
| 267 | POWER0_COM_ON | POWER0_VCC5_ON); |
| 268 | |
| 269 | /* VW ON, GVSS ON, VDD ON */ |
| 270 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 271 | POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON); |
| 272 | |
| 273 | /* Signals output enable */ |
| 274 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0); |
| 275 | |
| 276 | /* Set Phase Adjust */ |
| 277 | lcdtg_set_phadadj(lcd, lcd->mode); |
| 278 | |
| 279 | /* Initialize for Input Signals from ATI */ |
| 280 | corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS, |
| 281 | POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE | |
| 282 | POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L | |
| 283 | POLCTRL_EN_ACT_H); |
| 284 | udelay(1000); |
| 285 | |
| 286 | switch (lcd->mode) { |
| 287 | case CORGI_LCD_MODE_VGA: |
| 288 | corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA); |
| 289 | break; |
| 290 | case CORGI_LCD_MODE_QVGA: |
| 291 | default: |
| 292 | corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA); |
| 293 | break; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | static void corgi_lcd_power_off(struct corgi_lcd *lcd) |
| 298 | { |
| 299 | /* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */ |
| 300 | msleep(34); |
| 301 | |
| 302 | /* (1)VW OFF */ |
| 303 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 304 | POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON); |
| 305 | |
| 306 | /* (2)COM OFF */ |
| 307 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF); |
| 308 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 309 | POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON); |
| 310 | |
| 311 | /* (3)Set Common Voltage Bias 0V */ |
| 312 | lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF | |
| 313 | POWER0_VCC5_ON, 0); |
| 314 | |
| 315 | /* (4)GVSS OFF */ |
| 316 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 317 | POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON); |
| 318 | |
| 319 | /* (5)VCC5 OFF */ |
| 320 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 321 | POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF); |
| 322 | |
| 323 | /* (6)Set PDWN, INIOFF, DACOFF */ |
| 324 | corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, |
| 325 | PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF | |
| 326 | PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF); |
| 327 | |
| 328 | /* (7)DAC OFF */ |
| 329 | corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, |
| 330 | POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF); |
| 331 | |
| 332 | /* (8)VDD OFF */ |
| 333 | corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS, |
| 334 | POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF); |
| 335 | } |
| 336 | |
| 337 | static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m) |
| 338 | { |
| 339 | struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); |
| 340 | int mode = CORGI_LCD_MODE_QVGA; |
| 341 | |
| 342 | if (m->xres == 640 || m->xres == 480) |
| 343 | mode = CORGI_LCD_MODE_VGA; |
| 344 | |
| 345 | if (lcd->mode == mode) |
| 346 | return 0; |
| 347 | |
| 348 | lcdtg_set_phadadj(lcd, mode); |
| 349 | |
| 350 | switch (mode) { |
| 351 | case CORGI_LCD_MODE_VGA: |
| 352 | corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA); |
| 353 | break; |
| 354 | case CORGI_LCD_MODE_QVGA: |
| 355 | default: |
| 356 | corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA); |
| 357 | break; |
| 358 | } |
| 359 | |
| 360 | lcd->mode = mode; |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | static int corgi_lcd_set_power(struct lcd_device *ld, int power) |
| 365 | { |
| 366 | struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); |
| 367 | |
| 368 | if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power)) |
| 369 | corgi_lcd_power_on(lcd); |
| 370 | |
| 371 | if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power)) |
| 372 | corgi_lcd_power_off(lcd); |
| 373 | |
| 374 | lcd->power = power; |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static int corgi_lcd_get_power(struct lcd_device *ld) |
| 379 | { |
| 380 | struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev); |
| 381 | |
| 382 | return lcd->power; |
| 383 | } |
| 384 | |
| 385 | static struct lcd_ops corgi_lcd_ops = { |
| 386 | .get_power = corgi_lcd_get_power, |
| 387 | .set_power = corgi_lcd_set_power, |
| 388 | .set_mode = corgi_lcd_set_mode, |
| 389 | }; |
| 390 | |
| 391 | static int corgi_bl_get_intensity(struct backlight_device *bd) |
| 392 | { |
| 393 | struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev); |
| 394 | |
| 395 | return lcd->intensity; |
| 396 | } |
| 397 | |
| 398 | static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity) |
| 399 | { |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 400 | int cont; |
| 401 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 402 | if (intensity > 0x10) |
| 403 | intensity += 0x10; |
| 404 | |
| 405 | corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity); |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 406 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 407 | /* Bit 5 via GPIO_BACKLIGHT_CONT */ |
| 408 | cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted; |
| 409 | |
| 410 | if (gpio_is_valid(lcd->gpio_backlight_cont)) |
| 411 | gpio_set_value(lcd->gpio_backlight_cont, cont); |
| 412 | |
| 413 | if (gpio_is_valid(lcd->gpio_backlight_on)) |
| 414 | gpio_set_value(lcd->gpio_backlight_on, intensity); |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 415 | |
| 416 | if (lcd->kick_battery) |
| 417 | lcd->kick_battery(); |
| 418 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 419 | lcd->intensity = intensity; |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | static int corgi_bl_update_status(struct backlight_device *bd) |
| 424 | { |
| 425 | struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev); |
| 426 | int intensity = bd->props.brightness; |
| 427 | |
| 428 | if (bd->props.power != FB_BLANK_UNBLANK) |
| 429 | intensity = 0; |
| 430 | |
| 431 | if (bd->props.fb_blank != FB_BLANK_UNBLANK) |
| 432 | intensity = 0; |
| 433 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 434 | if (corgibl_flags & CORGIBL_SUSPENDED) |
| 435 | intensity = 0; |
| 436 | if (corgibl_flags & CORGIBL_BATTLOW) |
| 437 | intensity &= lcd->limit_mask; |
| 438 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 439 | return corgi_bl_set_intensity(lcd, intensity); |
| 440 | } |
| 441 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 442 | void corgibl_limit_intensity(int limit) |
| 443 | { |
| 444 | if (limit) |
| 445 | corgibl_flags |= CORGIBL_BATTLOW; |
| 446 | else |
| 447 | corgibl_flags &= ~CORGIBL_BATTLOW; |
| 448 | |
| 449 | backlight_update_status(the_corgi_lcd->bl_dev); |
| 450 | } |
| 451 | EXPORT_SYMBOL(corgibl_limit_intensity); |
| 452 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 453 | static struct backlight_ops corgi_bl_ops = { |
| 454 | .get_brightness = corgi_bl_get_intensity, |
| 455 | .update_status = corgi_bl_update_status, |
| 456 | }; |
| 457 | |
| 458 | #ifdef CONFIG_PM |
| 459 | static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state) |
| 460 | { |
| 461 | struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); |
| 462 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 463 | corgibl_flags |= CORGIBL_SUSPENDED; |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 464 | corgi_bl_set_intensity(lcd, 0); |
| 465 | corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | static int corgi_lcd_resume(struct spi_device *spi) |
| 470 | { |
| 471 | struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); |
| 472 | |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 473 | corgibl_flags &= ~CORGIBL_SUSPENDED; |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 474 | corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK); |
| 475 | backlight_update_status(lcd->bl_dev); |
| 476 | return 0; |
| 477 | } |
| 478 | #else |
| 479 | #define corgi_lcd_suspend NULL |
| 480 | #define corgi_lcd_resume NULL |
| 481 | #endif |
| 482 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 483 | static int setup_gpio_backlight(struct corgi_lcd *lcd, |
| 484 | struct corgi_lcd_platform_data *pdata) |
| 485 | { |
| 486 | struct spi_device *spi = lcd->spi_dev; |
| 487 | int err; |
| 488 | |
| 489 | lcd->gpio_backlight_on = -1; |
| 490 | lcd->gpio_backlight_cont = -1; |
| 491 | |
| 492 | if (gpio_is_valid(pdata->gpio_backlight_on)) { |
| 493 | err = gpio_request(pdata->gpio_backlight_on, "BL_ON"); |
| 494 | if (err) { |
| 495 | dev_err(&spi->dev, "failed to request GPIO%d for " |
| 496 | "backlight_on\n", pdata->gpio_backlight_on); |
| 497 | return err; |
| 498 | } |
| 499 | |
| 500 | lcd->gpio_backlight_on = pdata->gpio_backlight_on; |
| 501 | gpio_direction_output(lcd->gpio_backlight_on, 0); |
| 502 | } |
| 503 | |
| 504 | if (gpio_is_valid(pdata->gpio_backlight_cont)) { |
| 505 | err = gpio_request(pdata->gpio_backlight_cont, "BL_CONT"); |
| 506 | if (err) { |
| 507 | dev_err(&spi->dev, "failed to request GPIO%d for " |
| 508 | "backlight_cont\n", pdata->gpio_backlight_cont); |
| 509 | goto err_free_backlight_on; |
| 510 | } |
| 511 | |
| 512 | lcd->gpio_backlight_cont = pdata->gpio_backlight_cont; |
| 513 | |
| 514 | /* spitz and akita use both GPIOs for backlight, and |
| 515 | * have inverted polarity of GPIO_BACKLIGHT_CONT |
| 516 | */ |
| 517 | if (gpio_is_valid(lcd->gpio_backlight_on)) { |
| 518 | lcd->gpio_backlight_cont_inverted = 1; |
| 519 | gpio_direction_output(lcd->gpio_backlight_cont, 1); |
| 520 | } else { |
| 521 | lcd->gpio_backlight_cont_inverted = 0; |
| 522 | gpio_direction_output(lcd->gpio_backlight_cont, 0); |
| 523 | } |
| 524 | } |
| 525 | return 0; |
| 526 | |
| 527 | err_free_backlight_on: |
| 528 | if (gpio_is_valid(lcd->gpio_backlight_on)) |
| 529 | gpio_free(lcd->gpio_backlight_on); |
| 530 | return err; |
| 531 | } |
| 532 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 533 | static int __devinit corgi_lcd_probe(struct spi_device *spi) |
| 534 | { |
| 535 | struct corgi_lcd_platform_data *pdata = spi->dev.platform_data; |
| 536 | struct corgi_lcd *lcd; |
| 537 | int ret = 0; |
| 538 | |
| 539 | if (pdata == NULL) { |
| 540 | dev_err(&spi->dev, "platform data not available\n"); |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | |
| 544 | lcd = kzalloc(sizeof(struct corgi_lcd), GFP_KERNEL); |
| 545 | if (!lcd) { |
| 546 | dev_err(&spi->dev, "failed to allocate memory\n"); |
| 547 | return -ENOMEM; |
| 548 | } |
| 549 | |
| 550 | lcd->spi_dev = spi; |
| 551 | |
| 552 | lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev, |
| 553 | lcd, &corgi_lcd_ops); |
| 554 | if (IS_ERR(lcd->lcd_dev)) { |
| 555 | ret = PTR_ERR(lcd->lcd_dev); |
| 556 | goto err_free_lcd; |
| 557 | } |
| 558 | lcd->power = FB_BLANK_POWERDOWN; |
| 559 | lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA; |
| 560 | |
| 561 | lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev, |
| 562 | lcd, &corgi_bl_ops); |
| 563 | if (IS_ERR(lcd->bl_dev)) { |
| 564 | ret = PTR_ERR(lcd->bl_dev); |
| 565 | goto err_unregister_lcd; |
| 566 | } |
| 567 | lcd->bl_dev->props.max_brightness = pdata->max_intensity; |
| 568 | lcd->bl_dev->props.brightness = pdata->default_intensity; |
| 569 | lcd->bl_dev->props.power = FB_BLANK_UNBLANK; |
| 570 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 571 | ret = setup_gpio_backlight(lcd, pdata); |
| 572 | if (ret) |
| 573 | goto err_unregister_bl; |
| 574 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 575 | lcd->kick_battery = pdata->kick_battery; |
| 576 | |
| 577 | dev_set_drvdata(&spi->dev, lcd); |
| 578 | corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK); |
| 579 | backlight_update_status(lcd->bl_dev); |
Eric Miao | bfdcaa3 | 2008-08-29 05:57:20 +0800 | [diff] [blame] | 580 | |
| 581 | lcd->limit_mask = pdata->limit_mask; |
| 582 | the_corgi_lcd = lcd; |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 583 | return 0; |
| 584 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 585 | err_unregister_bl: |
| 586 | backlight_device_unregister(lcd->bl_dev); |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 587 | err_unregister_lcd: |
| 588 | lcd_device_unregister(lcd->lcd_dev); |
| 589 | err_free_lcd: |
| 590 | kfree(lcd); |
| 591 | return ret; |
| 592 | } |
| 593 | |
| 594 | static int __devexit corgi_lcd_remove(struct spi_device *spi) |
| 595 | { |
| 596 | struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev); |
| 597 | |
| 598 | lcd->bl_dev->props.power = FB_BLANK_UNBLANK; |
| 599 | lcd->bl_dev->props.brightness = 0; |
| 600 | backlight_update_status(lcd->bl_dev); |
| 601 | backlight_device_unregister(lcd->bl_dev); |
| 602 | |
Eric Miao | ff7a4c7 | 2008-09-07 11:30:06 +0800 | [diff] [blame] | 603 | if (gpio_is_valid(lcd->gpio_backlight_on)) |
| 604 | gpio_free(lcd->gpio_backlight_on); |
| 605 | |
| 606 | if (gpio_is_valid(lcd->gpio_backlight_cont)) |
| 607 | gpio_free(lcd->gpio_backlight_cont); |
| 608 | |
Eric Miao | b18250a | 2008-08-29 04:21:44 +0800 | [diff] [blame] | 609 | corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN); |
| 610 | lcd_device_unregister(lcd->lcd_dev); |
| 611 | kfree(lcd); |
| 612 | |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static struct spi_driver corgi_lcd_driver = { |
| 617 | .driver = { |
| 618 | .name = "corgi-lcd", |
| 619 | .owner = THIS_MODULE, |
| 620 | }, |
| 621 | .probe = corgi_lcd_probe, |
| 622 | .remove = __devexit_p(corgi_lcd_remove), |
| 623 | .suspend = corgi_lcd_suspend, |
| 624 | .resume = corgi_lcd_resume, |
| 625 | }; |
| 626 | |
| 627 | static int __init corgi_lcd_init(void) |
| 628 | { |
| 629 | return spi_register_driver(&corgi_lcd_driver); |
| 630 | } |
| 631 | module_init(corgi_lcd_init); |
| 632 | |
| 633 | static void __exit corgi_lcd_exit(void) |
| 634 | { |
| 635 | spi_unregister_driver(&corgi_lcd_driver); |
| 636 | } |
| 637 | module_exit(corgi_lcd_exit); |
| 638 | |
| 639 | MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00"); |
| 640 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"); |
| 641 | MODULE_LICENSE("GPL"); |