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fbd1b17b DB |
1 | /* |
2 | * LCD / Backlight control code for Sharp SL-6000x (tosa) | |
3 | * | |
4 | * Copyright (c) 2005 Dirk Opfer | |
5 | * Copyright (c) 2007,2008 Dmitry Baryshkov | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/spi/spi.h> | |
17 | #include <linux/i2c.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
fbd1b17b DB |
19 | #include <linux/gpio.h> |
20 | #include <linux/delay.h> | |
21 | #include <linux/lcd.h> | |
22 | #include <linux/fb.h> | |
23 | ||
24 | #include <asm/mach/sharpsl_param.h> | |
25 | ||
26 | #include <mach/tosa.h> | |
27 | ||
28 | #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL) | |
29 | ||
30 | #define TG_REG0_VQV 0x0001 | |
31 | #define TG_REG0_COLOR 0x0002 | |
32 | #define TG_REG0_UD 0x0004 | |
33 | #define TG_REG0_LR 0x0008 | |
34 | ||
35 | #define DAC_BASE 0x4e | |
36 | ||
37 | struct tosa_lcd_data { | |
38 | struct spi_device *spi; | |
39 | struct lcd_device *lcd; | |
40 | struct i2c_client *i2c; | |
41 | ||
42 | int lcd_power; | |
0ec561f4 | 43 | bool is_vga; |
fbd1b17b DB |
44 | }; |
45 | ||
46 | static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data) | |
47 | { | |
48 | u8 buf[1]; | |
49 | struct spi_message msg; | |
50 | struct spi_transfer xfer = { | |
51 | .len = 1, | |
52 | .cs_change = 1, | |
53 | .tx_buf = buf, | |
54 | }; | |
55 | ||
56 | buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f); | |
57 | spi_message_init(&msg); | |
58 | spi_message_add_tail(&xfer, &msg); | |
59 | ||
60 | return spi_sync(spi, &msg); | |
61 | } | |
62 | ||
63 | int tosa_bl_enable(struct spi_device *spi, int enable) | |
64 | { | |
65 | /* bl_enable GP04=1 otherwise GP04=0*/ | |
8ab77f46 | 66 | return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00); |
fbd1b17b DB |
67 | } |
68 | EXPORT_SYMBOL(tosa_bl_enable); | |
69 | ||
70 | static void tosa_lcd_tg_init(struct tosa_lcd_data *data) | |
71 | { | |
72 | /* TG on */ | |
73 | gpio_set_value(TOSA_GPIO_TG_ON, 0); | |
74 | ||
75 | mdelay(60); | |
76 | ||
77 | /* delayed 0clk TCTL signal for VGA */ | |
78 | tosa_tg_send(data->spi, TG_TPOSCTL, 0x00); | |
79 | /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */ | |
80 | tosa_tg_send(data->spi, TG_GPOSR, 0x02); | |
81 | } | |
82 | ||
83 | static void tosa_lcd_tg_on(struct tosa_lcd_data *data) | |
84 | { | |
85 | struct spi_device *spi = data->spi; | |
0ec561f4 DB |
86 | int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR; |
87 | ||
88 | if (data->is_vga) | |
89 | value |= TG_REG0_VQV; | |
90 | ||
91 | tosa_tg_send(spi, TG_PNLCTL, value); | |
fbd1b17b DB |
92 | |
93 | /* TG LCD pannel power up */ | |
8ab77f46 | 94 | tosa_tg_send(spi, TG_PINICTL, 0x4); |
fbd1b17b DB |
95 | mdelay(50); |
96 | ||
97 | /* TG LCD GVSS */ | |
8ab77f46 | 98 | tosa_tg_send(spi, TG_PINICTL, 0x0); |
fbd1b17b DB |
99 | |
100 | if (!data->i2c) { | |
8ab77f46 JH |
101 | /* |
102 | * after the pannel is powered up the first time, | |
103 | * we can access the i2c bus so probe for the DAC | |
104 | */ | |
fbd1b17b DB |
105 | struct i2c_adapter *adap = i2c_get_adapter(0); |
106 | struct i2c_board_info info = { | |
107 | .type = "tosa-bl", | |
108 | .addr = DAC_BASE, | |
109 | .platform_data = data->spi, | |
110 | }; | |
111 | data->i2c = i2c_new_device(adap, &info); | |
112 | } | |
113 | } | |
114 | ||
115 | static void tosa_lcd_tg_off(struct tosa_lcd_data *data) | |
116 | { | |
117 | struct spi_device *spi = data->spi; | |
118 | ||
119 | /* TG LCD VHSA off */ | |
8ab77f46 | 120 | tosa_tg_send(spi, TG_PINICTL, 0x4); |
fbd1b17b DB |
121 | mdelay(50); |
122 | ||
123 | /* TG LCD signal off */ | |
8ab77f46 | 124 | tosa_tg_send(spi, TG_PINICTL, 0x6); |
fbd1b17b DB |
125 | mdelay(50); |
126 | ||
127 | /* TG Off */ | |
128 | gpio_set_value(TOSA_GPIO_TG_ON, 1); | |
129 | mdelay(100); | |
130 | } | |
131 | ||
132 | int tosa_lcd_set_power(struct lcd_device *lcd, int power) | |
133 | { | |
134 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
135 | ||
136 | if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power)) | |
137 | tosa_lcd_tg_on(data); | |
138 | ||
139 | if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power)) | |
140 | tosa_lcd_tg_off(data); | |
141 | ||
142 | data->lcd_power = power; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static int tosa_lcd_get_power(struct lcd_device *lcd) | |
147 | { | |
148 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
149 | ||
150 | return data->lcd_power; | |
151 | } | |
152 | ||
0ec561f4 DB |
153 | static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode) |
154 | { | |
155 | struct tosa_lcd_data *data = lcd_get_data(lcd); | |
156 | ||
157 | if (mode->xres == 320 || mode->yres == 320) | |
158 | data->is_vga = false; | |
159 | else | |
160 | data->is_vga = true; | |
161 | ||
162 | if (POWER_IS_ON(data->lcd_power)) | |
163 | tosa_lcd_tg_on(data); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
fbd1b17b DB |
168 | static struct lcd_ops tosa_lcd_ops = { |
169 | .set_power = tosa_lcd_set_power, | |
170 | .get_power = tosa_lcd_get_power, | |
0ec561f4 | 171 | .set_mode = tosa_lcd_set_mode, |
fbd1b17b DB |
172 | }; |
173 | ||
1b9e450d | 174 | static int tosa_lcd_probe(struct spi_device *spi) |
fbd1b17b DB |
175 | { |
176 | int ret; | |
177 | struct tosa_lcd_data *data; | |
178 | ||
c8515294 JH |
179 | data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data), |
180 | GFP_KERNEL); | |
fbd1b17b DB |
181 | if (!data) |
182 | return -ENOMEM; | |
183 | ||
af901ca1 | 184 | data->is_vga = true; /* default to VGA mode */ |
0ec561f4 | 185 | |
fbd1b17b DB |
186 | /* |
187 | * bits_per_word cannot be configured in platform data | |
188 | */ | |
189 | spi->bits_per_word = 8; | |
190 | ||
191 | ret = spi_setup(spi); | |
192 | if (ret < 0) | |
c8515294 | 193 | return ret; |
fbd1b17b DB |
194 | |
195 | data->spi = spi; | |
196 | dev_set_drvdata(&spi->dev, data); | |
197 | ||
05a5d4d2 JH |
198 | ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON, |
199 | GPIOF_OUT_INIT_LOW, "tg #pwr"); | |
fbd1b17b DB |
200 | if (ret < 0) |
201 | goto err_gpio_tg; | |
202 | ||
203 | mdelay(60); | |
204 | ||
fbd1b17b DB |
205 | tosa_lcd_tg_init(data); |
206 | ||
207 | tosa_lcd_tg_on(data); | |
208 | ||
209 | data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data, | |
210 | &tosa_lcd_ops); | |
211 | ||
212 | if (IS_ERR(data->lcd)) { | |
213 | ret = PTR_ERR(data->lcd); | |
214 | data->lcd = NULL; | |
215 | goto err_register; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | ||
220 | err_register: | |
221 | tosa_lcd_tg_off(data); | |
fbd1b17b DB |
222 | err_gpio_tg: |
223 | dev_set_drvdata(&spi->dev, NULL); | |
fbd1b17b DB |
224 | return ret; |
225 | } | |
226 | ||
7e4b9d0b | 227 | static int tosa_lcd_remove(struct spi_device *spi) |
fbd1b17b DB |
228 | { |
229 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
230 | ||
231 | lcd_device_unregister(data->lcd); | |
232 | ||
233 | if (data->i2c) | |
234 | i2c_unregister_device(data->i2c); | |
235 | ||
236 | tosa_lcd_tg_off(data); | |
237 | ||
fbd1b17b | 238 | dev_set_drvdata(&spi->dev, NULL); |
fbd1b17b DB |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
243 | #ifdef CONFIG_PM | |
244 | static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state) | |
245 | { | |
246 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
247 | ||
248 | tosa_lcd_tg_off(data); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int tosa_lcd_resume(struct spi_device *spi) | |
254 | { | |
255 | struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev); | |
256 | ||
257 | tosa_lcd_tg_init(data); | |
258 | if (POWER_IS_ON(data->lcd_power)) | |
259 | tosa_lcd_tg_on(data); | |
260 | else | |
261 | tosa_lcd_tg_off(data); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | #else | |
266 | #define tosa_lcd_suspend NULL | |
8da00edc | 267 | #define tosa_lcd_resume NULL |
fbd1b17b DB |
268 | #endif |
269 | ||
270 | static struct spi_driver tosa_lcd_driver = { | |
271 | .driver = { | |
272 | .name = "tosa-lcd", | |
273 | .owner = THIS_MODULE, | |
274 | }, | |
275 | .probe = tosa_lcd_probe, | |
d1723fa2 | 276 | .remove = tosa_lcd_remove, |
fbd1b17b DB |
277 | .suspend = tosa_lcd_suspend, |
278 | .resume = tosa_lcd_resume, | |
279 | }; | |
280 | ||
462dd838 | 281 | module_spi_driver(tosa_lcd_driver); |
fbd1b17b DB |
282 | |
283 | MODULE_AUTHOR("Dmitry Baryshkov"); | |
284 | MODULE_LICENSE("GPL v2"); | |
285 | MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA"); | |
e0626e38 | 286 | MODULE_ALIAS("spi:tosa-lcd"); |